CN203880946U - Novel water circulation structure of gas angular tube hot water boiler - Google Patents

Abstract

A novel water circulation structure of a gas angular tube hot water boiler with the heating faces all forced to rise and flow avoids the tube bursting accidents possibly caused by water power working condition deteriorating such as subcooled boiling, stagnation and backflow. A boiler body is of a frame type self-supporting structure which is composed of large-diameter steel tubes arranged at the four corners, an upper header, a lower header, a longitudinal header and a horizontal header. The water circulation structure is composed of a hearth front wall water cooling wall, a hearth rear wall water cooling wall, side wall I film type water cooling wall heating faces, side wall II film type water cooling wall heating faces, side wall III film type water cooling wall heating faces, convection vertical shaft film type water cooling wall heating faces, flag type heating faces, headers and connecting tubes between above parts. The flag type heating faces which do not penetrate through walls are directly welded with closely-arrayed rear wall film type water cooling walls to reduce the horizontal pitch of tube bundles to guarantee reasonable smoke flowing speed. The two side walls are divided into three levels of heating faces according to different heat loads, and therefore the heat deviation and the flow deviation in water tubes are greatly reduced. The boiler body is formed by full film type water cooling walls, convection tubes do not penetrate through the walls, the air-tightness is good, air leakage is little, the combustion efficiency is high, and the novel water circulation structure can operate safely and efficiently for a long time under various loads.

Description

A new type of water circulation structure for a gas corner tube hot water boiler

technical field

The utility model relates to the technical field of boiler equipment, in particular to a novel water circulation structure of a gas angle tube hot water boiler.

Background technique

In recent years, with the discovery of several new large natural gas fields in China, such as Longgang, Dabei, and Keshen, more and more small coal-fired hot water boilers have been replaced by gas-fired boilers. Compared with coal-fired boilers, gas-fired boilers can fundamentally solve many environmental problems such as dust, waste water, waste residue, and harmful gas emissions. Among them, the corner-tube gas-fired hot water boiler has the advantages of reasonable structure, less raw material consumption, safe and reliable long-term operation, high efficiency, energy saving, emission reduction and environmental protection, and will definitely become the first choice of gas-fired hot water boiler in my country.

However, the existing angle tube technology has the following problems and hidden dangers in terms of long-term operation safety:

1) In the traditional corner tube hot water boiler, when the flue gas flows through the heating surface at the tail of the flue, due to the large flow cross-sectional area, the flow velocity is low, resulting in poor heat exchange between the flue gas and the heating surface, and convection at the tail The temperature of the medium in the heating surface is too low, and the wall temperature of the heating surface is often lower than the acid dew point temperature of the flue gas, resulting in low-temperature corrosion of the convective heating surface tubes, which seriously affects the safe operation of the boiler.

2) For forced circulation hot water boilers operating on the market, in most cases, partitions are arranged inside the upper and lower headers of the membrane water-cooled wall to divide the entire heating surface of the water-cooled wall into circulation loops flowing upward and downward , when the downward-flowing circulation loop operates at low load and suddenly loses power, there will inevitably be hydrodynamic conditions such as stagnation of water circulation and reverse flow. The existence of such conditions seriously threatens the operation safety of hot water boilers. Therefore, the existing The low load and power failure protection problems that may occur in the forced circulation mode have seriously affected the popularization and application of advanced technology products. The application number is: 201110212423.6, and the name of the utility model is a corner tube water circulation structure with all forced upward flow on the heating surface (the publication number is CN102374658A). The lower header has a forced upward flow structure. This structure is not conducive to the uniform distribution of the working medium in the header to the water-cooled wall tubes, and the reduction of flow deviation and thermal deviation.

Contents of the invention

In order to overcome the deficiencies in the prior art above, the purpose of this utility model is to provide a new type of water circulation structure for a gas corner tube hot water boiler, which can effectively reduce the risk of low-temperature corrosion of the convective heating surface caused by sulfuric acid condensation in the flue gas. It has the characteristics of low steel consumption, good air tightness, small flow deviation, small thermal deviation, no pipe burst and super power failure protection.

In order to achieve the above object, the technical solution adopted in the utility model is:

A new type of water circulation structure for a gas corner tube hot water boiler, comprising a furnace 103 and a convection shaft 101 arranged behind the furnace 103, a boiler front wall 102 is arranged in front of the furnace 103, and a boiler front wall 102 is arranged behind the convection shaft 101 The rear wall 104, the upper part of the furnace 103 is provided with side wall III membrane type water cooling wall upper header 10, side wall II membrane type water cooling wall upper header 11, outlet header 12 and side wall I membrane type The upper header 14 of the water-cooled wall, and the bottom of the furnace 103 are provided with side wall III membrane water-cooled wall lower header 1, side wall II membrane-type water-cooled wall lower header 28 and side wall I membrane-type water-cooled wall in sequence The lower header 26, the side wall III membrane water wall upper header 10 communicates with the side wall III membrane water wall lower header 1 through the side wall III membrane water wall 7, the side wall III membrane water wall The lower header 1 of the water-cooled wall communicates with the upper header 11 of the side wall II membrane water-cooled wall through the second connecting pipe 4, and the upper header 11 of the side wall II membrane water-cooled wall passes through the side wall II membrane water-cooled wall 8 It communicates with the lower header 28 of the side wall II membrane water-cooled wall, and the side wall I membrane water-cooled wall upper header 14 is connected to the side wall I membrane water-cooled wall lower header through the side wall I membrane water-cooled wall 17 Box 26 is connected;

A front corner tube 3 is vertically attached to the outer wall of the boiler front wall 102, and the upper end of the front corner tube 3 communicates with the upper header 10 of the side wall III membrane-type water-cooled wall through a third connecting tube 30. The lower end of the front corner tube 3 communicates with the lower header 2 of the front corner tube connected to the lower part of the boiler front wall 102, and the lower header 2 of the front corner tube is distributed to the water-cooled wall of the front and rear walls of the furnace through the horizontal connecting pipe 29 at the bottom of the furnace 103. The headers 5 are connected, and the distribution headers 5 of the front and rear walls of the furnace are respectively connected with the front wall membrane water wall 6 and the furnace rear wall membrane water wall 9, and the furnace front wall membrane water wall 6 and the furnace The rear wall membrane water-cooled wall 9 is also connected with the outlet header 12 respectively, and the lower header 28 of the side wall II membrane water-cooled wall is respectively connected to the pair through the first connecting pipe a22-1 and the first connecting pipe b22-2. The upper header 14 of the side wall I membrane water cooling wall of the wall is connected, and the first communication pipe a22-1 and the first communication pipe b22-2 both pass through the side wall I membrane water cooling wall 17;

A rear corner tube 24 is vertically attached to the outer wall of the boiler rear wall 104, and the lower header 26 of the side wall I membrane water-cooled wall communicates with the upper header 18 of the rear corner tube through the rear corner tube 24. The upper header 18 of the rear corner tube is communicated with the convection heating surface collection box 13 provided on the top of the furnace 103 through a horizontal communication pipe 15, the horizontal communication pipe 15 is located above the convection shaft 101, and the outer wall of the boiler rear wall 104 The lower part is connected with the lower header 25 of the rear wall membrane type water cooling wall, and the lower header 25 of the rear wall membrane type water cooling wall is connected with the densely packed membrane type water cooling wall 19, and the densely packed membrane type water cooling wall 19 is connected in series from top to bottom A first-stage flag-type convective heating surface 23 and a second-stage flag-type convective heating surface 20 are arranged, and the close-packed membrane water-cooled wall 19 communicates with the convective heating surface collection box 13 .

The distribution header 5 of the water-cooled wall at the front and rear walls of the furnace is arranged in the furnace 103; the membrane-type water-cooled wall 6 at the front of the furnace and the membrane-type water-cooled wall 9 at the rear of the furnace are arranged in front and rear oppositely in the furnace 103 .

The corners on both sides of the front wall corner pipe 3 are engaged with the edges on both sides of the outer wall of the boiler front wall 102; The upper header 18 of the rear corner tube is arranged above the rear corner tube 24, the lower header 25 of the rear wall membrane type water cooling wall is arranged below the rear corner tube 24, and the rear wall membrane type water cooling wall lower The header 25 is connected with a water supply pipe 21 .

The upper ends of the front wall membrane type water cooling wall 6 of the furnace hearth and the furnace rear wall membrane type water cooling wall 9 are connected to the outlet header 12; the furnace front wall membrane type water cooling wall 6 and the furnace rear wall membrane type water cooling wall 9 The lower ends of each are in communication with the water wall distribution header 5 of the front and rear walls of the furnace.

The wall-membrane water-cooled wall 6 at the front of the furnace and the membrane-type water-cooled wall 9 at the rear of the furnace have the same structure, and are composed of a plurality of light pipes sequentially welded through flat steel.

The membrane water cooling wall 17 of the side wall I, the membrane water cooling wall 8 of the side wall II and the membrane water cooling wall 7 of the side wall III have the same structure, and are composed of a plurality of light pipes sequentially welded through flat steel.

The arrangement of the third communication pipe 30, the second communication pipe 4, the first communication pipe a22-1, and the first communication pipe b22-2 is such that: the upper header 10 of the side wall III membrane type water-cooled wall, the side wall III The flow arrangement of the parallel pipe group composed of wall III membrane water cooling wall 7 and side wall III membrane water cooling wall lower header 1 is an "inverted Z" type; the side wall II membrane water cooling wall upper header 11, side wall II membrane Type water wall 8 and side wall II membrane water wall lower header 28 make up the flow arrangement of the parallel pipe group in "Z" shape; the side wall I membrane water wall upper header 14, side wall I membrane water cooling The flow arrangement of the parallel tube group composed of the wall 17 and the lower header 26 of the membrane type water-cooled wall of the side wall I is "U" shape.

The first communication pipe a22-1 and the first communication pipe b22-2 communicate with the lower header 28 of the side wall II membrane water-cooled wall and the upper header 14 of the side wall I membrane water-cooled wall respectively, and form a through-wall cross structure.

The first-stage flag-type convective heating surface 23 and the second-stage flag-type convective heating surface 20 are respectively welded to the close-packed membrane water-cooled wall 19; The surface collection header 13 is connected, and the lower part of the close-packed membrane water-cooled wall 19 communicates with the lower header 25 of the rear wall membrane-type water-cooled wall; the first-stage flag-type convection heating surface 23 and the second-stage flag-type The convection heating surface 20 adopts a plurality of light pipes with different diameters respectively, and the plurality of light pipes are arranged in sequence and the diameters of the light pipes are successively reduced.

The close-packed membrane water-cooled wall 19 is composed of a plurality of water-cooled wall tubes, and two adjacent water-cooled wall tubes are welded by connecting parts; the diameter of the water-cooled wall tubes is Φ60mm～Φ133mm, The wall tube spacing is 62mm ~ 135mm.

Compared with the prior art, the utility model has the following advantages:

1) In the new water circulation structure of the gas corner tube hot water boiler of the utility model, the side wall of the boiler is divided into three heating surfaces according to the different heat loads, and the working medium in the heating surface adopts multiple forced upward flow, which greatly reduces the internal pressure of the water pipe. The flow deviation, and all the working medium in all heating surfaces flow upwards, and the downward flow is all non-heating surface tubes, which completely eliminates the possible occurrence of conventional natural circulation or conventional forced circulation circuit design due to the downward flow of some water-cooled wall tubes In abnormal hydrodynamic conditions of stagnation or reverse flow, all the working medium in the membrane water wall flows upwards to ensure a high mass flow rate of the working medium, which effectively eliminates the temperature rise of the tube wall caused by supercooled boiling in the tube. Hazardous conditions of pipe bursts.

2) In the new water circulation structure of the gas corner tube hot water boiler of the utility model, the arrangement of the third connecting pipe, the second connecting pipe and the first connecting pipe of the boiler makes the side wall III membrane water wall and the side wall II membrane water wall 1. The flow arrangement of side wall I membrane type water wall corresponding to the parallel tube group is "inverted Z", "Z" and "U". Since the parallel tube group is arranged in "U" shape, the pressure difference distribution of the water wall tube group It is relatively uniform, and when the parallel tube group is arranged in a "Z" or "inverted Z" shape, the pressure difference between the inlet and outlet of the water-cooled wall tubes in the area far away from the outlet end of the collecting box is smaller than the pressure difference between the inlet and outlet of the water-cooled wall tubes in the area near the outlet end of the header box. If the pressure difference is large, the flow rate of the working medium is high, so the flow rate of the working medium in the side wall membrane water wall tube near the central area of the furnace with high temperature is high, and the flow rate of the working medium in the side wall membrane water wall tube in the lower temperature area is low , while the convection shaft with relatively uniform temperature distribution has a uniform flow rate of the working medium in the side wall membrane water wall tube, which greatly reduces the overall thermal deviation of the side wall membrane wall tube.

3) In the new water circulation structure of the gas corner tube hot water boiler of the utility model, the first connecting pipe of the boiler connects the lower header of the side wall II membrane water-cooled wall with the upper header of the side wall I membrane water-cooled wall of the opposite wall and forms a through-wall The cross structure, as the downcomer, is also used as the load-bearing part of the first-stage flag-type convection heating surface and the second-stage flag-type convection heating surface in the convection shaft. The structure design is extremely ingenious and the space utilization rate is high. It is a new type of The fixed installation method of the convection heating surface in the high temperature area is unique and can greatly save steel.

4) In the new water circulation structure of the gas angle tube hot water boiler of the utility model, the pipe diameter of the first-stage flag-type convection heating surface in the convection shaft is larger than the pipe diameter of the second-stage flag-type convection heating surface, and there is no need to pass through the wall, directly and The close-packed membrane water wall is welded to reduce the transverse pitch of the tube bundle, thereby increasing the flow velocity of the flue gas from the furnace into the flue and flowing through the heating surface at the tail of the flue, strengthening the heat exchange between the flue gas and the heating surface, and improving The temperature of the metal wall surface on the convective heating surface is lowered, which effectively reduces the dangerous working condition of low-temperature corrosion caused by sulfuric acid condensation in the flue gas.

5) The new water circulation structure of the gas corner tube hot water boiler of the utility model will automatically open the air release valve after a sudden power failure, and the header, downcomer and riser can form a natural circulation loop, which has a super power failure protection function.

Description of drawings

Fig. 1 is a side view of the new water circulation structure of the utility model gas angle tube hot water boiler.

Fig. 2 is a schematic diagram of the front half-section structure of the new water circulation structure of the gas angle tube hot water boiler of the utility model.

Fig. 3 is a schematic structural diagram of the main circulation pipeline along the direction A-A in Fig. 2 .

Fig. 4 is a schematic structural diagram of the main circulation pipeline along the B-B direction in Fig. 2 .

Fig. 5 is a structural diagram of the close-packed tube-membrane water wall in the new water circulation structure of the utility model gas angle tube hot water boiler.

Fig. 6 is a structural diagram of a membrane-type water-cooled wall made of flat steel-shaped light tubes in the new water circulation structure of the utility model gas angle tube hot water boiler.

In the figure, 1. Side wall III membrane type water-cooled wall lower header, 2. Front corner tube lower header, 3. Front corner tube, 4. Second connecting tube, 5. Furnace front and rear wall water-cooled wall distribution header, 6 .Front wall membrane water cooling wall, 7. Side wall III membrane water cooling wall, 8. Side wall II membrane water cooling wall, 9. Furnace rear wall membrane water cooling wall, 10. Side wall III membrane water cooling wall upper set Box, 11. Side wall Ⅱ membrane type water cooling wall upper header, 12. Outlet header, 13. Convection heating surface collecting header, 14. Side wall Ⅰ membrane type water cooling wall upper header, 15. Horizontal connecting pipe, 17 .Side wall I membrane water wall, 18. Rear corner tube upper header, 19. Close-packed membrane water wall, 20. Second-stage flag-type convection heating surface, 21. Water supply pipe, 22-1. First connection Pipe a, 22-2. Second connecting pipe b, 23. First-stage flag-type convection heating surface, 24. Rear wall corner pipe, 25. Rear wall membrane type water-cooled lower header, 26. Side wall I membrane type water cooling Header under the wall, 27. Flue gas outlet, 28. Side wall II membrane water-cooled wall header, 29. Horizontal connecting pipe, 30. Third connecting pipe, 101. Convection shaft, 102. Boiler front wall, 103. Furnace, 104. Boiler rear wall.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in more detail.

The utility model has a novel water circulation structure for a gas-fired corner tube hot water boiler, as shown in Figure 1, which includes a furnace 103 and a convection shaft 101 arranged behind the furnace 103, and a boiler front wall 102 and a convection shaft 101 are arranged in front of the furnace 103. Boiler rear wall 104 is set at the rear of the furnace, and above the furnace 103, side wall III membrane water-cooled wall upper header 10, side wall II membrane water-cooled wall upper header 11, outlet header 12, side wall Ⅰ Membrane water-cooled wall upper header 14, the lower part of the furnace 103 is provided with side wall Ⅲ membrane water-cooled wall lower header 1, side wall Ⅱ membrane-type water-cooled wall lower header 28, side wall Ⅰ membrane-type water-cooled The lower header 26 of the wall, the upper header 10 of the side wall III membrane water-cooled wall are connected with the lower header 1 of the side wall III membrane water-cooled wall through the side wall III membrane water-cooled wall 7, and the lower header of the side wall III membrane water-cooled wall The box 1 is connected with the upper header 11 of the side wall II membrane water cooling wall through the second connecting pipe 4, and the upper header 11 of the side wall II membrane water cooling wall is connected with the side wall II membrane water cooling wall 8 through the side wall II membrane water cooling wall The lower header 28 of the wall is connected, and the upper header 14 of the side wall I membrane water-cooled wall is connected with the lower header 26 of the side wall I membrane water-cooled wall through the side wall I membrane water-cooled wall 17; the outer wall of the boiler front wall 102 The front corner tube 3 is vertically attached, the upper end of the front corner tube 3 communicates with the side wall III membrane water wall upper header 10 through the third connecting tube 30, and the lower end of the front corner tube 3 is connected with the lower part of the boiler front wall 102 The lower header 2 of the front corner tube is connected, and the lower header 2 of the front corner tube is connected with the distribution header 5 of the water-cooled wall of the front and rear walls of the furnace through the horizontal connecting pipe 29 at the bottom of the furnace 103, and the distribution header 5 of the water-cooled wall of the front and rear walls of the furnace is respectively connected with The front wall membrane water cooling wall 6 of the furnace is connected with the furnace rear wall membrane water cooling wall 9, and the furnace front wall membrane water cooling wall 6 and the furnace rear wall membrane water cooling wall 9 are respectively connected with the outlet header 12, as shown in Fig. 2 and Fig. As shown in 3, the lower header 28 of the side wall II membrane water-cooled wall is connected to the upper header 14 of the side wall I membrane water-cooled wall on the opposite wall through the first connecting pipe a22-1 and the first connecting pipe b22-2 respectively. Both the first connecting pipe a22-1 and the first connecting pipe b22-2 pass through the side wall I membrane water-cooled wall 17, and the rear corner pipe 24 is vertically attached to the outer wall of the boiler rear wall 104, and the side wall I membrane water-cooled The header under the wall 26 communicates with the upper header 18 of the rear corner tube through the rear corner tube 24, and the upper header 18 of the rear corner tube communicates with the convection heating surface collecting header 13 provided on the top of the furnace 103 through the horizontal communication tube 15, and the horizontal communication tube 15 is located above the convection shaft 101, and the lower part of the outer wall of the boiler rear wall 104 is connected with the lower header 25 of the rear wall membrane water cooling wall, and the lower header 25 of the rear wall membrane water cooling wall is connected with the densely packed membrane type water cooling wall 19. The membrane water cooling wall 19 is provided with the first-stage flag-type convective heating surface 23 and the second-stage flag-type convective heating surface 20 in series from top to bottom.

Side wall III membrane water cooling wall 7 is the water cooling wall formed by connecting side wall III membrane water cooling wall upper header 10 and side wall III membrane water cooling wall lower header 1, and side wall II membrane water cooling wall 8 is the connecting side wall The water wall formed by the upper header 11 of the membrane type water cooling wall of II and the lower header 28 of the membrane type water cooling wall of the side wall II, and the upper header 14 of the membrane type water cooling wall of the side wall I of the side wall is connected with the upper header 14 of the membrane type water cooling wall of the side wall and the side wall Ⅰ The water-cooled wall formed by the lower header 26 of the membrane-type water-cooled wall. Both sides of the furnace 103 are three-stage heating surfaces composed of side wall I membrane water cooling wall 17 , side wall II membrane water cooling wall 8 and side wall III membrane water cooling wall 7 .

As a preferred embodiment of the present utility model, the water-cooled wall distribution header 5 on the front and rear walls of the furnace is arranged in the furnace 103; set up.

As a preferred embodiment of the present utility model, the corners on both sides of the front wall corner tube 3 are engaged with the edges on both sides of the outer wall of the boiler front wall 102; , the upper header 18 of the rear wall corner tube is set above the rear wall corner tube 24, the lower header 25 of the rear wall membrane water-cooled wall is set under the rear wall corner tube 24, and the lower header 25 of the rear wall membrane water-cooled wall is connected to the water supply Tube 21.

Side wall III membrane water cooling wall upper header 10, side wall II membrane water cooling wall upper header 11 and side wall I membrane water cooling wall upper header 14 are formed by dividing large-diameter tubes in the upper part of the boiler into three spaces.

The upper ends of the front wall membrane water cooling wall 6 of the furnace and the furnace rear wall membrane water cooling wall 9 are connected with the outlet header 12, and the lower ends of the furnace front wall membrane water cooling wall 6 and the furnace rear wall membrane water cooling wall 9 are connected with the front and rear of the furnace. The wall water-cooled wall distribution headers 5 are connected.

The membrane water cooling wall 6 at the front wall of the furnace, the membrane water cooling wall 9 at the rear wall of the furnace, the membrane water cooling wall 7 of the side wall III, the membrane water cooling wall 8 of the side wall II and the membrane water cooling wall 17 of the side wall I are of the same structure, and the structure is as follows As shown in Figure 6, they are all composed of a plurality of light pipes welded sequentially through flat steel; the furnace front wall membrane type water cooling wall 6, the furnace rear wall membrane type water cooling wall 9, the side wall I membrane type water cooling wall 17, the side wall II membrane type water cooling wall In each light pipe on the water-cooled wall 8 and the membrane-type water-cooled wall 7 of the side wall III, the hot water flows upward forcibly.

As shown in Figure 4, the arrangement of the third communication pipe 30, the second communication pipe 4, the first communication pipe a22-1, and the first communication pipe b22-2 is such that: the header 10 on the side wall III membrane type water-cooled wall , side wall III membrane water cooling wall 7, and side wall III membrane water cooling wall lower header 1. The flow arrangement of the parallel pipe group composed of Ⅱ membrane water cooling wall 8 and side wall II membrane water cooling wall lower header 28 is “Z” type; the side wall I membrane water cooling wall upper header 14 and side wall I membrane The flow arrangement of the parallel tube group composed of the wall 17 and the lower header 26 of the side wall I membrane water wall is "U" shape. The flow direction of the water in the second communication pipe 4, the first communication pipe a22-1, and the first communication pipe b22-2 is consistent with the front wall corner pipe 3 and the rear wall corner pipe 24, all of which are descending flows.

As shown in Figure 2, the first communication pipe a22-1 and the first communication pipe b22-2 communicate with the lower header 28 of the side wall II membrane water cooling wall and the upper header 14 of the side wall I membrane water cooling wall respectively, and form Cross-wall structure; the first communication pipe a22-1 and the first communication pipe b22-2 are used as the downcomer while serving as the first-stage flag-type convection heating surface 23 and the second-stage flag-type convection heating surface in the convection shaft 101 The load-bearing part of the surface 20.

In the convection shaft 101, the first-stage flag-type convective heating surface 23 and the second-stage flag-type convective heating surface 20 respectively adopt bare pipes with different pipe diameters (the diameter of the former is larger than that of the latter), and the first The first-stage flag-type convection heating surface 23 and the second-stage flag-type convection heating surface 20 are respectively welded to the close-packed membrane water wall 19, and the upper part of the close-packed membrane water wall 19 is connected to the convection heating surface collection box 13, and the close-packed membrane The bottom of the type water cooling wall 19 communicates with the lower header 25 of the rear wall membrane type water cooling wall.

As a preferred embodiment of the present utility model, as shown in Figure 5, the close-packed membrane water-cooled wall 19 is composed of a plurality of water-cooled wall light tubes, and two adjacent water-cooled wall light tubes are connected by welding, and the water-cooled wall tubes The diameter of the tube is Φ60mm～Φ133mm, and the distance between two adjacent water wall tubes is 62mm～135mm.

The heating surface of the membrane water cooling wall 6 in the front wall of the furnace, the heating surface of the membrane water cooling wall 9 in the rear wall of the furnace, the heating surface of the side wall I membrane water cooling wall 17, the heating surface of the side wall II membrane water cooling wall 8, the side wall The working medium on the heating surface of III membrane water cooling wall 7 and the heating surface of close-packed membrane water cooling wall 19 all ascends and flows.

The working principle of the new water circulation structure of the utility model gas angle tube hot water boiler is as follows:

When the water is sent into the lower header 25 of the convection shaft rear wall membrane water wall connected to the close-packed membrane water-cooled wall 19 through the water supply pipe 21, it is evenly distributed to the close-packed membrane water-cooled wall 19, and then flows through the close-packed membrane water-cooled wall 19 in sequence. The first-stage flag-type convective heating surface 23 and the second-stage flag-type convective heating surface 20 connected in series with the film-row water wall 19 absorb the heat released by the high-temperature flue gas in the convection shaft 101 during the upward flow process, and are heated to a predetermined temperature. After setting the temperature, it enters the convection heating surface collection box 13 connected to the upper part of the close-packed membrane water cooling wall 19, and then leads the working fluid to the rear corner tube at the boiler rear wall 104 perpendicular to the water cooling wall tube through the horizontal connecting pipe 15 The upper header 18 distributes the water to the rear corner tubes 24 on both sides of the outer wall of the boiler rear wall 104, flows down and flows outside the boiler rear wall 104 without being heated, and distributes water evenly to the lower header 26 of the side wall I membrane water-cooled wall. The heat released by the high-temperature flue gas in the convection shaft 101 is absorbed by the side wall I membrane water-cooled wall 17 to rise and flow, and after being heated to a higher temperature, it enters the side wall I membrane water-cooled wall upper header 14 respectively, and in the side wall I After mixing in the upper header 14 of the membrane-type water-cooled wall, the first connecting pipe a22-1 and the first connecting pipe b22-2 are respectively passed through the wall to lead to the side wall II membrane-type water-cooled lower header 28 of the opposite wall. Wall II membrane water-cooled wall 8 absorbs the heat released by the high-temperature flue gas in the furnace 103 and flows upwards. After being heated to a higher temperature, it enters the upper header 11 of the side wall II membrane water-cooled wall of the furnace 103 and passes through the second connecting pipe. 4 leads to the lower header 1 of the side wall III membrane water-cooled wall, absorbs the heat released by the high-temperature flue gas in the furnace 103 through the side wall III membrane water-cooled wall 7, and flows up and flows. After being heated to a higher temperature, it enters the side wall of the boiler III Membrane-type water-cooled wall upper header 10, through the third connecting pipe 30, the water is led to the front wall corner tubes 3 on both sides of the outer wall of the boiler front wall 102, and flows down outside the boiler front wall 102 without being heated, and enters the bottom of the boiler front corner tube The header 2 then passes through the horizontal connecting pipe 29 at the bottom of the furnace 103, enters the distribution header 5 of the water-cooled walls of the front and rear walls of the furnace, and passes through the front wall membrane water wall 6 and the furnace rear wall membrane water wall 9 respectively to absorb in the furnace 103 The heat released by the high-temperature flue gas rises and flows and collects to the outlet header 12, and continuously absorbs heat through the heat-absorbing surfaces at all levels, and reaches the rated outlet hot water temperature and sends it to the pipe network; when the high-temperature flue gas released by gas fuel combustion passes through the Radiation heat transfer to the furnace front wall membrane water cooling wall 6, the furnace rear wall membrane water cooling wall 9, the side wall III membrane water cooling wall 7, and the side wall II membrane water cooling wall 8 through the radiation of the furnace rear wall water cooling smokestack 16 After exchanging heat with convection, the high-temperature flue gas turns 180° through the steering chamber, and then enters the convection shaft 101, where it scours the second-stage flag-type convection heating surface 20 and the first-stage flag-type convection heating surface 23 in sequence and connects with the side wall I membrane The type water wall 17 performs convective heat exchange, and the flue gas is discharged from the flue gas outlet 27 at the lower part of the boiler after the body completes the heat exchange.

Claims (10)

1. A novel water circulation structure of a gas angle tube hot water boiler, characterized in that it comprises a furnace (103) and a convection shaft (101) arranged at the rear of the furnace (103), and a boiler is provided in front of the furnace (103) A front wall (102), a boiler rear wall (104) is arranged behind the convection shaft (101), and a side wall III membrane type water-cooled upper header (10 ), side wall II membrane type water-cooled wall upper header (11), outlet header (12) and side wall I membrane type water-cooled wall upper header (14), the bottom of the furnace (103) is set in sequence There are side wall III membrane type water cooling wall lower header (1), side wall II membrane type water cooling wall lower header (28) and side wall I membrane type water cooling wall lower header (26), the side wall III membrane type The water wall upper header (10) communicates with the side wall III membrane water wall lower header (1) through the side wall III membrane water wall (7), and the side wall III membrane water wall lower header ( 1) Connect with the side wall II membrane water-cooled upper header (11) through the second connecting pipe (4), and the side wall II membrane water-cooled upper header (11) passes through the side wall II membrane water-cooled The wall (8) communicates with the lower header (28) of the side wall II membrane water-cooled wall, and the upper header (14) of the side wall I membrane water-cooled wall is connected to the side wall I membrane water-cooled wall (17) The lower header (26) of the membrane-type water-cooled wall of the side wall I is connected; A front corner tube (3) is vertically attached to the outer wall of the boiler front wall (102), and the upper end of the front corner tube (3) is connected to the side wall III membrane water-cooled tube through a third connecting tube (30). The header (10) on the wall is connected, the lower end of the front corner pipe (3) is connected with the lower header of the front corner pipe (2) connected to the lower part of the boiler front wall (102), and the lower header of the front corner pipe (2) ) through the horizontal connecting pipe (29) located at the bottom of the furnace (103) communicates with the distribution headers (5) of the water-cooled walls of the front and rear walls of the furnace, and the distribution headers (5) of the water-cooled walls of the front and rear walls of the furnace are respectively connected to the front wall of the furnace. The water-cooled wall (6) is connected with the furnace rear wall membrane water wall (9), and the furnace front wall membrane water wall (6) and the furnace rear wall membrane water wall (9) are also respectively connected with the outlet header ( 12) Communication, the lower header (28) of the side wall II membrane water-cooled wall passes through the first communication pipe a (22-1), the first communication pipe b (22-2) and the side wall I membrane of the opposite wall respectively. The upper header (14) of the type water-cooled wall is connected, and the first communicating pipe a (22-1) and the first communicating pipe b (22-2) both pass through the side wall I membrane-type water-cooled wall (17); A rear corner tube (24) is vertically attached to the outer wall of the boiler rear wall (104), and the lower header (26) of the side wall I membrane type water-cooled wall passes through the rear corner tube (24) and the rear corner The header on the tube (18) is connected, and the header on the tube at the rear corner (18) is connected to the convection heating surface collector (13) provided on the top of the furnace (103) through a horizontal connecting tube (15). The pipe (15) is located above the convection shaft (101), the lower part of the outer wall of the boiler rear wall (104) is connected with a rear wall membrane type water cooling wall lower header (25), and the rear wall membrane type water cooling wall lower header The box (25) communicates with the close-packed membrane water wall (19), and the close-packed film water wall (19) is arranged in series from top to bottom with a first-stage flag-type convective heating surface (23) and a second-stage flag Convective heating surface (20), the close-packed membrane water wall (19) communicates with the collection box (13) of the convective heating surface. 2. The novel water circulation structure of the gas corner tube hot water boiler according to claim 1, characterized in that, the distribution headers (5) of the front and rear walls of the furnace are arranged in the furnace (103); The wall membrane type water cooling wall (6) and the furnace rear wall membrane type water cooling wall (9) are arranged front and back in the furnace (103) oppositely. 3. The new water circulation structure of the gas-fired corner tube hot water boiler according to claim 1, characterized in that the corners on both sides of the front wall corner tube (3) are snap-fitted on both sides of the outer wall of the boiler front wall (102) edge; The corners on both sides of the rear corner pipe (24) are fitted on the edges on both sides of the outer wall of the boiler rear wall (104), and the upper header (18) of the rear corner pipe is arranged on the corner of the rear corner pipe (24). Above, the rear wall membrane type water cooling wall lower header (25) is arranged below the rear wall corner pipe (24), and the rear wall membrane type water cooling wall lower header (25) is connected with a water supply pipe (21). 4. The novel water circulation structure of the gas corner tube hot water boiler according to claim 1 or 2, characterized in that the upper ends of the front wall membrane water wall (6) and the furnace rear wall membrane water wall (9) are are all connected with the outlet header (12); The lower ends of the front wall membrane water cooling wall (6) of the furnace and the rear wall membrane water cooling wall (9) of the furnace are both connected to the distribution header (5) of the water cooling wall front and rear walls of the furnace. 5. The novel water circulation structure of the gas corner tube hot water boiler according to claim 4, characterized in that, the wall-type water-cooled wall (6) in front of the furnace and the membrane-type water-cooled wall (9) in the rear of the furnace have the same structure, They are all composed of multiple light pipes welded sequentially through flat steel. 6. The new water circulation structure of the gas corner tube hot water boiler according to claim 1, characterized in that the side wall I membrane water cooling wall (17), the side wall II membrane water cooling wall (8) and the side wall III The membrane water wall (7) has the same structure, and is composed of a plurality of light pipes welded sequentially through flat steel. 7. The new water circulation structure of the gas angle tube hot water boiler according to claim 1, characterized in that the third communication pipe (30), the second communication pipe (4) and the first communication pipe a (22-1 ), the arrangement of the first connecting pipe b (22-2) is such that: the side wall III membrane water wall upper header (10), the side wall III membrane water wall (7) and the side wall III membrane water wall The flow arrangement of the parallel pipe group composed of the lower header (1) of the water wall is "inverted Z" type; the upper header (11) of the side wall II membrane water wall, the side wall II membrane water wall (8) and the side wall The flow arrangement of the parallel pipe group composed of the lower header (28) of the II membrane water wall is "Z" type; the upper header (14) of the side wall I membrane water wall (14), the side wall I membrane water wall (17 ) and the lower header (26) of the side wall I membrane water wall, the flow arrangement of the parallel tube group is "U" shape. 8. The new water circulation structure of the gas corner tube hot water boiler according to claim 1, characterized in that, the first communication pipe a (22-1) and the first communication pipe b (22-2) are respectively connected to the The lower header (28) of the membrane-type water-cooled wall of the side wall II and the upper header (14) of the membrane-type water-cooled wall of the side wall I are connected, and form a wall-crossing structure. 9. The novel water circulation structure of the gas corner tube hot water boiler according to claim 1, characterized in that the first-stage flag-type convective heating surface (23) and the second-stage flag-type convective heating surface (20) are respectively connected to The close-packed membrane water wall (19) is welded; The upper part of the close-packed membrane water cooling wall (19) is connected to the convection heating surface collection box (13), and the lower part of the close-packed membrane water cooling wall (19) is connected to the bottom of the rear wall membrane water cooling wall. Header (25) is connected; The first-stage flag-type convective heating surface (23) and the second-stage flag-type convective heating surface (20) respectively adopt a plurality of light pipes with different diameters, and the plurality of light pipes are arranged in sequence and the pipe diameters of the light pipes are sequentially arranged. decrease. 10. The new water circulation structure of the gas corner tube hot water boiler according to claim 1, characterized in that the close-packed membrane water wall (19) is composed of a plurality of water wall tubes, and between two adjacent water wall tubes Welding between connecting parts; The diameter of the water-cooled wall tubes is Φ60mm-Φ133mm, and the distance between two adjacent water-cooled wall tubes is 62mm-135mm.