CN201106926Y - A hot stove preheating device - Google Patents

Abstract

The utility model provides an additional hot-blast furnace preheating device who fires burning furnace of improved generation, it comprises firing burning furnace and heat exchanger, and the hot-blast furnace flue waste gas of drawing forth is said to the management and is sent to firing burning furnace, fires burning furnace export mist pipe connection to heat exchanger entry, and air and coal gas are connected to the hot-blast furnace after the heat exchanger heat exchange, and the heat exchanger exit linkage is to the hot-blast furnace chimney, and its characteristics are that the vertical of adopting grid formula combustor fires burning furnace and adopt plate heat exchanger. Because the grid type combustor and the plate type heat exchanger are adopted, the overall height of the conventional vertical combustion furnace is reduced, and the heat transfer efficiency is improved. The utility model discloses an overall structure is simple, and the technology is arranged compactly, and equipment life is long, and one-time investment and long-term maintenance cost low grade advantage. The utility model provides a fire higher, the tubular heat exchanger area of burning furnace space in the past big, can not satisfy the requirement of place space restriction at the dilatation transformation to and tubular heat exchanger structure is unstable, the short-lived scheduling problem.

Description

A hot stove preheating device

technical field

The utility model relates to a hot blast stove preheating device, in particular to a hot blast stove preheating device which uses a combination of a plate heat exchanger and a vertical combustion furnace to preheat the combustion-supporting air and gas required by the hot blast stove.

Background technique

Increasing the temperature of hot air and reducing the energy consumption of ironmaking has always been the key content of ironmaking production. At present, such a process is widely used at home and abroad, that is, the mixed gas mixed with the flue gas generated by the hot blast stove and the flue gas generated by the combustion furnace is used to preheat the air and gas. This process includes a tubular heat exchanger and a combustion Furnace and other main equipment, such as the patent No. 96225818.0, which uses horizontal combustion furnaces and tube heat exchangers, etc., and the patent No. 02280459.5, which uses vertical ceramic burners. Combustion furnace and tube heat exchanger, etc., the above two types of preheating devices have some problems in practical application. The vertical combustion furnace covers a large area, and the ceramic burner used in the vertical combustion furnace has many types of bricks and is complicated. It is difficult to manufacture, construct, and masonry, and the cycle is long. Moreover, the existing vertical combustion furnaces all have the problems of high overall profile and large steel consumption.

Contents of the invention

The purpose of the utility model is to provide a hot blast stove preheating device of an improved additional combustion furnace with small volume, simple structure, convenient maintenance and long service life.

The purpose of this utility model is achieved in this way: it is composed of a combustion furnace and a heat exchanger, and the exhaust gas from the hot blast stove flue drawn through the pipeline is sent to the combustion furnace, and the mixed gas pipeline at the outlet of the combustion furnace is connected to the inlet of the heat exchanger, and the air and The coal gas is connected to the hot blast stove after being heat exchanged by the heat exchanger, and the outlet of the heat exchanger is connected to the chimney of the hot blast stove.

The combustion furnace of the utility model is composed of a furnace shell, a furnace lining, a combustion chamber, a mixing chamber, and various gas inlets and outlets. The combustion chamber is equipped with a burner, which has a gas channel and an air channel, and is respectively connected with the gas inlet and the air inlet on the furnace body; there is an annular flue outside the central area of the mixing chamber, and the annular flue is connected to the exhaust gas of the hot blast stove. The entrance is connected, and a 30°-60° spray outlet is provided between the annular flue and the central area.

The concrete structure of the present utility model is that the burner of its combustion furnace adopts grid type, is made up of pillar and fire grate. The pillar is welded into a curved shape by steel plate, which can be used as the structural support of the grate, and divides the space in the combustion chamber into two parts, the gas channel and the air channel. The grate above the column is a grid structure, which is composed of two staggered grates with long strip holes and a three-layer structure above them with a grate with square holes. The grates of the grid holes are casted with refractory materials.

The plate heat exchanger of the utility model mainly includes inlet and outlet connecting pipes for mixed gas and air (or gas), plates and brackets. The mixed gas and air (or gas) enter the heat exchanger plates in a countercurrent manner. The plates are made of 0.6-0.8mm stainless steel sheets, machine-pressed and molded into corrugated forms, and the plates are connected by welding.

Because the utility model adopts the grid type burner, the overall height of the existing vertical combustion furnace is reduced, so that the process arrangement is more flexible. The structure of the burner body is simple, economical and applicable, the air flow is evenly distributed, and the combustion is complete and complete; the structural design of the annular flue and the nozzle of the mixing chamber of the combustion furnace ensures that the exhaust gas and flue gas are evenly mixed. At the same time, the utility model uses a plate heat exchanger as a heat transfer device, so that under the same heat transfer area, the volume and weight of the equipment are reduced by 2/3 (compared with the tube heat exchanger), and the process layout is more compact; The short process makes the pressure drop, and the heat transfer efficiency is high; the installation and disassembly of the plate is simple, which makes the maintenance convenient, and the service life and reliability of the equipment are greatly improved, and the service life can reach 15 years.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of burner;

Fig. 3 is the structural representation of the grate of burner grid shape;

Fig. 4 is the structural representation of the strip-shaped fire grate of burner;

Fig. 5 Schematic diagram of the structure of the curved pillar of the burner.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figure 1, the utility model is mainly composed of a vertical combustion furnace and a plate heat exchanger, and the combustion furnace and the plate heat exchanger are connected through pipelines.

As shown in Figure 1, the vertical combustion furnace 1 of the present utility model mainly comprises shell 2, furnace lining 3, combustion chamber 4 and mixing chamber 5, is provided with gas inlet 6, air inlet 7, hot-blast stove exhaust gas on furnace body Inlet 8, mixed gas outlet 9. Wherein the combustion chamber 4 is provided with a burner 10, the burner 10 has a gas channel and an air channel, and is respectively connected with the gas inlet 6 and the air inlet 7 on the furnace body; there is an annular flue 11 outside the central area of the mixing chamber 5 , the annular flue 11 communicates with the exhaust gas inlet 8 of the hot blast stove, and the ejection port 12 of 30°-60° is arranged between the annular flue 11 and the central area, and the mixed gas outlet 9 is arranged on the top of the combustion furnace. The coal gas and air are mixed and burned in the combustion chamber 4, and the temperature of the flue gas generated after combustion reaches above 1100°C. The exhaust gas from the flue of the hot blast stove with a temperature of about 100°C to 300°C enters the annular flue 11 from the exhaust gas inlet 8, sprays into the central area from the outlet 12, and mixes with the flue gas generated by the combustion furnace, and the mixed gas reaches 500 ℃～600℃. The gas mixture outlet at the top of the burner is connected to the inlet of the heat exchanger through a pipe 18 .

As shown in Figure 2, the burner 10 is made of a curvilinear support 13 and grates 14, 15 mounted on it. As shown in Figures 3 and 4, the grate is a grid structure, consisting of two staggered grates 15 with long strip holes and a three-layer grate 14 with square holes on them. The structure is combined, and the two layers of fire grates 15 are vertically staggered. Fire grate 14,15 all adopts refractory castable pouring molding, for guaranteeing strength, adopts round steel to do reinforcement.

As shown in Figure 5, the curved pillar 13 of the burner is made of steel plate welding, and the space in the combustion chamber is divided into two parts: a gas channel 16 and an air channel 17. The gas and air enter the combustion through the independent gas channel 16 and air channel 17. The upper part of the burner passes through the grill grate, so that the air and gas are evenly distributed on the surface of the burner to ensure full and complete combustion.

As shown in Figure 1, the mixed gas and air (or coal gas) of the combustion furnace enter from the connecting pipe 21 and the connecting pipe 23 of the heat exchanger 19 respectively, and run countercurrently, and are independently distributed between the heat exchanger plates 20, and the plates The room is connected by welding, and the mixed gas and air (or coal gas) after heat exchange are discharged from the connecting pipe 25 and the connecting pipe 22 respectively. The bracket 24 can bear the weight of the heat exchanger and carry out equipment installation. The plate heat exchanger is made of stainless steel sheet. Heat transfer elements, high heat transfer efficiency, low process short pressure; detachable plates, easy maintenance.

Claims (7)

1. A hot blast stove preheating device is composed of a combustion furnace and a heat exchanger. The hot blast stove flue gas drawn out through the pipeline is sent to the combustion furnace, and the mixed gas pipeline (18) at the outlet of the combustion furnace (1) is connected to the heat exchange (19) inlet, air and gas are sent to the hot blast stove after heat exchange by the heat exchanger (19), and the outlet of the heat exchanger (19) is connected to the chimney of the hot blast stove. Combustion furnace (1) and plate heat exchanger (19) are adopted. 2. A kind of hot blast stove preheating device according to claim 1, it is characterized in that combustion furnace (1) comprises shell (2), furnace lining (3), combustion chamber (4) and mixing chamber (5), in furnace The body is provided with a gas inlet (6), an air inlet (7), a hot blast stove exhaust gas inlet (8), and a mixed gas outlet (9), and a burner (10) is arranged in the combustion chamber, and a gas channel is provided in the burner (10) (16) and air channel (17), and communicate with gas inlet (6) and air inlet (7) on the body of heater respectively; There is annular flue (11) outside the central area of mixing chamber, and annular flue (11) It communicates with the exhaust gas inlet (8) of the hot blast stove, and a spray outlet (12) of 30°～60° is provided between the annular flue (11) and the central area, 3. A hot blast stove preheating device according to claim 1, characterized in that its plate heat exchanger (19) includes a plate (20), a mixed gas inlet connection (21), an air or gas inlet connection (23 ), the mixed gas outlet connection (25), the air or gas outlet connection (22), the heat exchanger support (24), and the inlet and outlet of the same medium are arranged on both sides of the heat exchanger. 4. A kind of hot blast stove preheating device according to claim 2, it is characterized in that: the gas passage (16) and the air passage (17) of the burner (10) in the combustion chamber (4) are formed by curved pillars ( 13) separated in the space of the combustion chamber, the top of the curvilinear pillar (13) is equipped with a grate type fire grate. 5. A kind of hot blast stove preheating device according to claim 4, it is characterized in that: the grate type grate consists of two grates (15) with elongated grid holes staggered up and down and one above them The three-layer structure of the fire grate (14) with square grid hole is combined. 6. A hot blast stove preheating device according to claim 5, characterized in that: two grates (15) with elongated grid holes are vertically staggered. 7. A hot blast stove preheating device according to claim 1 or 3, characterized in that: the plates (20) are made of 0.6-0.8mm stainless steel thin plates, and the plate shape is corrugated, and each plate (20) is in the End edges on the same inlet and outlet sides are welded together at intervals.

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