CN203203009U - Vertical modularized coal water slurry corner tube boiler - Google Patents

Abstract

The utility model discloses a vertical modularized coal water slurry corner tube boiler which comprises a boiler body, a hearth, burners, a steady combustion chamber, a bottom soot hopper, an air pre-heater, an economizer, a convection bank, an upper collecting box, a top collecting box, a boiler barrel and a lower colleting box. The boiler body comprises four down pipes arranged on four corners and a membrane water wall. The two ends of the down pipes and the two ends of the membrane water wall are respectively connected with the upper collecting box and the lower collecting box; the convection band is arranged outside the membrane water wall, the top of the convection band is communicated with a smoke outlet of the hearth, and the bottom of the convection band is communicated with the bottom of the air pre-heater; the bottom soot hopper is arranged at the bottom of the boiler body; the boiler is divided into several big modules including the boiler barrel, the bottom soot hopper, the convection band and the membrane water wall to manufacture and install. The vertical modularized coal water slurry corner tube boiler has the advantages of being compact in overall structure, simple in appearance arrangement, small in occupied area, low in steel consumption, big in water circulation differential pressure, safe and reliable in water circulation, easy and fast to manufacture and install, reliable in operation, easy and convenient to maintain and the like.

Description

A vertical modular coal water slurry corner tube boiler

technical field

The utility model belongs to the field of coal-fired industrial boilers, and in particular relates to a vertical modular coal-water slurry corner-tube boiler which uses coal-water slurry of various grades as fuel and is used to generate steam. the

Background technique

my country's energy structure is dominated by coal. For a long time in the future, coal-fired industrial boilers will still be the leading product of industrial boilers. the

The traditional industrial coal-fired boilers are mainly layer-fired boilers. The disadvantages are low combustion efficiency and serious pollution, which makes it difficult to meet the requirements of energy saving, emission reduction and pollutant discharge. the

Coal-water slurry combustion is one of the efficient and clean combustion methods of coal, and its combustion efficiency can reach more than 98%. It is a mature combustion technology and is widely used in large-scale power plant boilers. In recent years, coal-water slurry powder combustion has also been applied in industrial boilers, all of which adopt SHS double-drum bulk water tube boiler structure or D-type double drum water tube structure. But there are certain deficiencies:

1) The combustion is not uniform enough, and the temperature difference between front and back is relatively large, which is not conducive to reducing the content of NO _X.

2) The load adjustment range is small, and only a single grade of coal-water slurry fuel can be used. the

3) It is inconvenient to clean up boiler ash and slag. the

4) Boiler steel and furnace wall materials consume a lot. the

5) The boiler room occupies a large area and the cost of civil construction is high. the

6) The sealing performance of the boiler is not good, the air leakage of the brick wall is large, the heat loss of the boiler is large, and the power consumption of the induced draft fan is large. the

7) It is inconvenient to manufacture and install the SHS double-drum bulk water tube boiler. the

Contents of the invention

The utility model provides a novel vertical modular coal-water slurry corner-tube boiler aiming at the deficiencies of the existing bulk water-tube boilers and horizontal coal-water slurry boilers. the

The utility model is realized through the following technical solutions: a vertical modular coal-water slurry corner tube boiler, including a boiler body, a furnace, a burner, a combustion chamber, a cold ash hopper, an air preheater, and an economizer , convection tube bundle, upper header, top header, drum and lower header, the lower header is arranged at the bottom of the boiler body; the upper header and the top header are arranged at the top of the boiler body, And communicate through the steam connecting pipe; it is characterized in that the stable combustion chamber is arranged at the lower front of the boiler body; the burner is arranged on the front wall of the stable combustion chamber; the boiler body includes four corners 4 downcomers and membrane water walls; the two ends of the downcomers and membrane water walls communicate with the upper header and the lower header respectively; the convection tube bundle is arranged on the membrane water wall On the outside, the top communicates with the smoke outlet of the boiler chamber, and the bottom communicates with the bottom of the air preheater; the economizer communicates with the top of the air preheater; the cold ash hopper is set on the boiler the bottom of the body. the

In the vertical modular coal-water slurry corner-tube boiler of the utility model, various levels of coal-water slurry are sprayed into the vertical L-shaped furnace through the front wall burner, and at the same time, the high-temperature air heated by the air preheater also enters The burner is mixed with coal-water slurry and enters the furnace for violent suspension combustion. the

After combustion and heat exchange in the furnace, the high-temperature flue gas turns 180° downward from the furnace smoke outlet and enters the convection tube bundle for convective heat exchange. the

The utility model has the following advantages:

1) The boiler body is arranged in a vertical corner tube structure, and four large-diameter downpipes are arranged at the four corners. The downpipes are the water circulation pipeline and also support the entire boiler, so there is no need to set up a supporting steel frame. The overall structure is compact and Simple layout, small footprint and low steel consumption. the

2) The furnace adopts a membrane wall structure, the furnace wall only needs insulation materials, the overall sealing and insulation performance are good, the boiler has less air leakage, and the induced draft fan consumes less power. the

3) The boiler is divided into stable combustion chamber, cold ash hopper, boiler drum, convection tube bundle, membrane water wall and other large membrane blocks, which effectively solves the problem that the boiler transportation size limits the boiler capacity development, and the boiler manufacturing and installation are simple fast. the

4) The membrane wall structure of the boiler has high strength and the boiler operates reliably. the

5) The boiler can be repaired and replaced in all directions, which has the advantage of easy maintenance. the

6) The pressure difference of the boiler water circulation is large, and the water circulation is safe and reliable. the

7) The upper header and the top header are connected with the steam connecting pipe and connected to the drum at the same time, the steam-water mixture enters the upper header from the heating surface, and the steam-water pre-separation occurs in the upper header, and the steam passes through the steam connecting pipe to the top header Enter the steam space in the upper part of the drum. Since the upper headers are all connected at the high water level of the drum, the steam directly enters the drum without passing through the water space, thereby avoiding the generation of foam, and the steam entering the drum has been pre-separated, so , greatly improving the quality of steam. the

As a further improvement of the utility model, the burner is arranged as a single or multiple burners. The advantage of the arrangement of multiple burners is that each burner can be controlled independently, which greatly improves the stability of combustion and the regulation performance of load, and can use more than two kinds of fuels at the same time. the

As a further improvement of the present utility model, the convection tube bundle adopts flag surface tubes, and the flag surface tubes are vertically arranged in a row at a certain angle, the heating surface is sufficient, the circulation is reliable, the flue gas scours smoothly, and it is not easy to accumulate dust. Extend boiler life. the

As a further improvement of the utility model, a primary secondary air duct for combustion is provided at the front lower part of the furnace. The left and right sides of the middle part of the furnace are respectively provided with secondary air ducts for combustion and denitrification. Using staged combustion technology, two stages of secondary air are sent into the furnace in sequence, and the entire temperature field is uniform, which can effectively prevent coking in the furnace and reduce the formation of nitrogen oxides under the premise of ensuring the full combustion of unburned products. the

Description of drawings

Fig. 1 is a structural diagram of a vertical modular coal-water slurry corner tube boiler of the present invention. the

Fig. 2 is a half-sectional view along the lines A-A and B-B of Fig. 1 . the

In the figure, 1- economizer, 2- air preheater, 3- convection tube bundle, 4- upper header, 5- steam connecting pipe, 6- top header, 7- explosion-proof door, 8- drum, 9 -down pipe, 10-secondary secondary air pipe, 11-membrane water wall, 12-inspection door, 13-burner, 14-first primary secondary air pipe, 15-lower header, 16-cold ash hopper , 17-slagging machine, 18-stabilized combustion chamber, 19-boiler smoke outlet, 20-furnace. the

Detailed ways

Referring to the accompanying drawings, a vertical modular coal-water slurry corner tube boiler of the present invention includes a boiler body, a furnace 20, a burner 13, a combustion chamber 18, a cold ash hopper 16, an air preheater 2, a province Coal burner 1, convection tube bundle 3, upper header 4, top header 6, drum 8 and lower header 15, the lower header 15 is arranged at the bottom of the boiler body; the upper header 4 and the top The header 6 is arranged on the top of the boiler body, and communicated through the steam connecting pipe 5; it is characterized in that the stable combustion chamber 18 is arranged at the lower front part of the boiler body; the burner 13 is arranged in the stable combustion chamber 18 the front wall; the boiler body includes four downcomers 9 and membrane water walls 11 arranged at four corners; the two ends of the downcomers 9 and membrane water walls 11 are connected to the upper header 4 and the The header 15 is in communication; the convection tube bundle 3 is arranged on the outside of the membrane water wall 11, the top is in communication with the boiler chamber smoke outlet 19, and the bottom is in communication with the bottom of the air preheater 2; the province The coal burner 1 communicates with the top of the air preheater 2; the cold ash hopper 16 is arranged at the bottom of the boiler body. the

The number of burners 13 described is single or multiple arrangements. The combustion of multiple burners 13 can be independently controlled. The upper part of the furnace 20 is provided with an explosion-proof door 7 , the lower front part is provided with a combustion-supporting primary secondary air duct 14 , and the middle part is provided with a combustion-supporting and denitration secondary air duct 10 . The bottom of the furnace 20 collects ash and slag through the cold ash hopper 16 and automatically discharges it through the slag discharger 17 . the

The convection tube bundle 3 adopts flag surface tubes, and the flag surface tubes are vertically arranged in a row at a certain angle. The heating surface is sufficient, the circulation is reliable, the flue gas is washed smoothly, and it is not easy to accumulate dust, which prolongs the service life of the boiler. the

The working principle of the utility model is as follows:

The coal-water slurry of each level is sprayed into the vertical L-shaped furnace 20 through the multiple burners 13 in the front. At the same time, the high-temperature air heated by the air preheater 2 also enters the burner 13 and mixes with the atomized coal-water slurry. Furnace 20 carries out violent suspension combustion; and two stages of secondary air are arranged in the furnace, so that the furnace has sufficient oxygen and fuel to react and burn, effectively preventing coking in the furnace and reducing nitrogen oxides under the premise of ensuring full combustion of unburned products generation. After combustion and heat exchange in the furnace, the high-temperature flue gas turns 180° from the smoke outlet 19 above the furnace 20 and enters the flag surface tube 3 for convective heat exchange, and then the flue gas enters the air preheater 2 and the economizer 1 in turn. Then it is discharged into the flue gas purification system. In the flue gas cleaning system, the solid particles in the flue gas are removed. Clean preheated air is re-injected into the vertical furnace 20 from a plurality of burners 13 . The economizer 1 and the air preheater 2 can use the waste heat of the flue gas to preheat the boiler feed water and air, so as to achieve the purpose of recycling and saving energy after the waste heat is recovered. the

The upper header 4, the steam connecting pipe 5, the top header 6, the lower header 15, the membrane water wall 11 of the furnace and the four downcomers 9 constitute a closed water circulation system. The upper header 4 and the top header 6 are connected with the steam connecting pipe 5 and connected to the drum 7 at the same time, the steam-water mixture rises from the heating surface of the membrane water wall into the upper header 4, and the steam-water pre-separation occurs in the upper header 4 , steam enters the steam space at the top of the drum 8 through the steam connecting pipe 5 to the top header 6 . Since the upper header 4 is connected to the high water level of the drum 8, the steam directly enters the drum without passing through the water space, thereby avoiding the generation of foam, and the steam entering the drum 8 has been pre-separated , Therefore, the quality of the steam is greatly improved. The water after pre-separation of steam and water in the upper header 4 flows into the lower header 15 from the four downcomers 9, and then enters the membrane water cooling wall to form a water cycle. the

It should be understood that: the above-mentioned embodiment is only an illustration of the utility model, rather than a limitation of the utility model, and any utility model creation that does not exceed the spirit of the utility model falls within the scope of protection of the utility model Inside. the

Claims (6)

1. vertical type module water-coal-slurry corner tube boiler, comprise boiler body, burner hearth (20), burner (13), stable burning room (18), furnace hopper (16), air preheater (2), economizer (1), convection bank (3), upper collecting chamber (4), top collection case (6), drum (8) and next part case (15), described next part case (15) is arranged on the bottom of boiler body; Described upper collecting chamber (4) and top collection case (6) are arranged on the top of boiler body, and by vapour communicating pipe (5) UNICOM; It is anterior to it is characterized in that described stable burning room (18) is arranged under the boiler body; Described burner (13) is arranged on the front wall of described stable burning room (18); Described boiler body comprises 4 down-comers (9) and the fin panel casing (11) that is arranged in four jiaos; The two ends of described down-comer (9) and fin panel casing (11) respectively with described upper collecting chamber (4) and next part case (15) UNICOM; Described convection bank (3) is arranged on the outside of described fin panel casing (11), top and pot thorax outlet flue (19) UNICOM, the end UNICOM of bottom and described air preheater (2); The top UNICOM of described economizer (1) and described air preheater (2); Described furnace hopper (16) is arranged on the bottom of boiler body.

2. a kind of vertical type module water-coal-slurry corner tube boiler as claimed in claim 1 is characterized in that described burner (13) quantity is single or multiple layouts.

3. a kind of vertical type module water-coal-slurry corner tube boiler as claimed in claim 1 is characterized in that described convection bank (3) employing flag facial canal structure, and it is vertical along the row layout that described flag facial canal is pressed certain angle.

4. a kind of vertical type module water-coal-slurry corner tube boiler as claimed in claim 1 is characterized in that described preceding bottom in burner hearth (20) is provided with the one-level secondary air channel of combustion-supporting usefulness.

5. as any one described a kind of vertical type module water-coal-slurry corner tube boiler of claim 1-4, it is characterized in that describedly being respectively equipped with secondary secondary air channel combustion-supporting and that denitration is used in the left and right sides, burner hearth (20) middle part.

6. a kind of vertical type module water-coal-slurry corner tube boiler as claimed in claim 1, its feature is provided with explosion proof door (7) described in burner hearth (20) top.

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