CN201032343Y - A spherical top-fired hot blast stove with circularly arranged vertically upward-spraying burners - Google Patents

Abstract

The utility model relates to a spherical top-burning hot blast stove with annular arrangement of vertically upward-spraying burners, which effectively solves the problems of uneven temperature and velocity distribution of the combustion air flow of the hot blast stove and poor overall heat transfer effect. The structure is that the lower part of the furnace body There are flue openings, furnace bottom and furnace grate. The furnace body is a regenerator. There is a burner between the upper part of the furnace body and the furnace roof. There is a hot air outlet on the furnace roof. There is a gas preheating loop in the wall of the burner. There is a combustion-supporting air preheating loop in the expansion body, a gas outlet and a nozzle on the top of the gas preheating loop, a gas inlet connected to the gas preheating loop on the burner wall, and a burner wall above the gas inlet There is a combustion-supporting air preheating loop connected with the combustion-supporting air inlet and the combustion-supporting air outlet, and there is an air nozzle on the upper part of the air outlet. The utility model has a unique and novel structure, effectively and skillfully solves key problems in the combustion process such as air mixing, air distribution, and flue gas preheating, and has huge economic and social benefits.

Description

A spherical top-fired hot blast stove with circularly arranged vertically upward-spraying burners

1. Technical field

The utility model relates to a combustion device, in particular to a spherical top-burning hot blast stove with a ring-shaped arrangement of vertically upward-spraying burners.

2. Background technology

The hot blast stove is an important auxiliary equipment for the blast furnace ironmaking project. It is a periodic operation device for intermittent heating and cooling. Its performance directly affects the normal operation, efficiency and service life of itself and the blast furnace. At present, the most commonly used structural forms are internal combustion type, external combustion type and top combustion type. Due to the advantages of high combustion intensity, short flame distance and relatively simple structure, the top combustion type hot blast stove has achieved considerable development in recent years. , is widely used in the blast furnace hot air supply, however, there are still many places worthy of technological innovation and research and development in terms of technological maturity. The existing top-burning hot blast stove is equipped with a top pre-combustion chamber, and the gas and air are tangentially entered in the swirling flow and mixed into the combustion chamber for combustion. Due to the existence of the swirling flow, there is a large backflow flow in the middle of the combustion chamber, making the airflow radial The distribution is extremely uneven, which greatly affects the combustion process, resulting in the inability of the flue gas flow to have a uniform velocity and temperature distribution, thus affecting the overall heat transfer effect in the furnace. If the mixing method without swirl is used, there will be problems of poor mixing and unstable flame. In addition, because the pre-combustion chamber is in a different temperature range during the combustion process and the air supply process, there is a large alternating thermal stress; and it is placed on a high-temperature vault, which is prone to structural problems. Therefore, it is imperative to carry out larger structural improvements.

3. Contents of utility model

In view of the above situation, the purpose of this utility model is to provide a spherical top-combustion hot blast stove with a circular arrangement of vertically upward-spraying burners, which can effectively solve and overcome the uneven distribution of the combustion airflow temperature and velocity of the existing top-combustion hot blast stoves , the overall heat transfer effect is poor and the structure is unreasonable. The technical solution is to include a furnace (arch) roof, a combustion chamber, a ceramic burner and a furnace body. The lower part of the furnace body has a flue opening and a furnace bottom. The upper furnace body is equipped with a grate, and the furnace body is a regenerator. There is a ceramic burner between the upper part of the furnace body and the furnace roof, and it is placed in the lower part of the combustion chamber. There is a hot air outlet on the furnace roof. The wall of the ceramic burner There is a vertical gas preheating ring inside, and a vertical combustion air preheating ring in the upper expansion body. There is a vertical gas outlet and a nozzle on the top of the vertical gas preheating ring. There is a ceramic burner wall. The gas inlet connected with the vertical gas preheating ring, the ceramic burner wall above the gas inlet has a vertical combustion air preheating ring connected with the combustion air inlet and the combustion air outlet, and there is an air nozzle on the upper part of the air outlet. The utility model has a unique and novel structure, effectively and skillfully solves key problems in the combustion process such as air mixing, air distribution, and flue gas preheating, realizes stable flame, improves combustion intensity, improves heat transfer effect, and improves load regulation function etc., thereby saving fuel, saving investment, reducing exhaust gas temperature and emissions, effectively prolonging the service life of the hot blast stove, and its economic and social benefits are huge.

4. Description of drawings

Fig. 1 is the structural section front view of the present utility model.

Fig. 2 is a front view of the structural section of the ceramic burner of the present invention.

Fig. 3 is a top view of section A-A in Fig. 2 of the present utility model.

5. Specific implementation

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in detail.

Shown in Fig. 1 and Fig. 2, the utility model includes a furnace top 12, a combustion chamber 11, a ceramic burner 8 and a body of furnace 2, the lower part of the body of furnace 2 has a flue opening 3 and a furnace bottom 1, and the furnace on the top of the flue opening Furnace grate 6 is installed in the body, and the furnace body is a regenerator 7. There is a ceramic burner 8 between the upper part of the furnace body and the furnace roof, and is placed in the lower part of the combustion chamber 11. There is a hot air outlet 9 on the furnace roof 12. The ceramic burner 8. There is a vertical gas preheating loop 14 in the burner wall 15, a vertical combustion-supporting air preheating loop 17 in the upper expansion body, and a vertical gas outlet 21 and the top of the vertical gas preheating loop. The spout 20 has a gas inlet 13 connected to the vertical gas preheating loop on the ceramic burner wall, and a vertical combustion air preheating loop 17 and combustion air inlet 16 are arranged on the ceramic burner wall above the gas inlet It communicates with the combustion-supporting air outlet 18, and an air nozzle 19 is arranged on the upper part of the air outlet. In order to facilitate maintenance and ensure the use effect, the upper part of the furnace roof 12 is equipped with a manhole 10, and the lower part of the furnace body 2 is equipped with a manhole 4 for entering maintenance, observation, etc. The furnace body 2 has a refractory material layer 5.

The entrances of the vertical gas preheating ring 14 of the ceramic burner and the air preheating ring 17 of the combustion chamber are tangential inlets; the air nozzle 19 and the gas nozzle 20 of the ceramic burner are vertically upward, and the nozzles are Rectangular or circular, the injected gas and air are reflowed at high temperature before mixing to preheat the gas and air to increase the combustion temperature. The furnace roof 12 adopts a catenary vault, and the ceramic burner is placed at the base of the vault. Supported on the furnace body 2 and the ceramic burner wall 15. The vertical gas preheating loop and the vertical air preheating loop are provided with a plurality of outlet (collecting) pipes in a crossing manner.

It can be seen from the above that the utility model adopts a vertical gas and air combustion-supporting loop, and is preheated by the reentrant flue gas, thereby improving the combustion conditions and increasing the combustion intensity, and the uniform distribution of the reentrant hot air flow can effectively improve the storage capacity. Heat utilization efficiency. In the hot blast stove of the utility model, the thermal fluid presents a uniform distribution characteristic of turbulent flow in the tube, which is very beneficial to heating the lower regenerator, while the existing hot blast stove is not the case, and the hot air distribution is low in the middle (even reverse flow ) and high flow characteristics on both sides, resulting in insufficient heating in the middle of the regenerator.

The utility model is obviously different from the characteristics of the existing ceramic burner in that:

1. Coal gas and air are injected vertically upwards, preheated at high temperature in the hot blast stove with the help of high-temperature flue gas backflow, and completely mixed and burned by staggered injection to achieve full combustion, high combustion temperature, and large heat load adjustment range the goal of;

2. The gas and air are injected vertically upwards and then burnt, and turn back under the action of the hot blast stove vault to form a downward hot air flow with uniform distribution of temperature and speed, and then enter the upper part of the hot blast stove regenerator, so that the regenerator is evenly heated , which can meet the requirements of high hot air temperature and stable hot air;

3. The inlet pipes of the gas ring and the air ring are tangentially connected, so that the average error of the dozens of outlet (collection) pipes that are evenly arranged and staggered can be obtained in the velocity distribution of less than ±5%, thereby improving the circumferential Airflow mixing improves the overall combustion effect;

4. The catenary vault is adopted, with good stress structure, small vault and long service life;

5. The burner is set at the base of the vault, supported on the furnace shell and the large wall, and can maintain a small temperature change without being affected by the heat radiation of the combustion chamber, effectively prolonging the service life;

6. The distance between the support seat and the arch angle is far, and the high-temperature flame cannot move down, so that the temperature of the support seat is within the normal tolerance range;

7. Since the utility model realizes an overall uniform combustion and heat transfer process, the height of the heat accumulator can be reduced by 20% compared with the heat accumulator used in a blast furnace with the same volume, which effectively saves investment.

In a word, the utility model is a creative improvement to the structure of the existing top-combustion hot blast stove, which makes each functional structure feature and layout more scientific and reasonable, more convenient to popularize and use, and contains huge economic and social benefits.

Claims (6)

1. dome burning type hot-air furnace that has the vertical up-spray burner that is circular layout, include furnace roof (12), combustion chamber (11), ceramic burner (8) and body of heater (2), it is characterized in that, floss hole (3) and furnace bottom (1) are arranged at body of heater (2) bottom, by in the body of heater on floss hole top grate (6) is housed, in the body of heater is regenerator (7), ceramic burner (8) is arranged between upper of furnace body and the furnace roof, and place the bottom of combustion chamber (11), hot-blast outlet (9) is arranged on the furnace roof (12), ceramic burner (8) is that vertical gas preheating circuit (14) is arranged in the burner body of wall (15), vertical combustion air preheating circuit (17) is arranged in its upper expansion body, the spout (20) at vertical gas exit (21) and top thereof is arranged at vertical gas preheating circuit top, the gas entry (13) that is communicated with vertical gas preheating circuit is arranged on the ceramic burner body of wall, have vertical combustion air preheating circuit (17) to be connected with combustion air inlet (16) and combustion air outlet (18) on the ceramic burner body of wall on gas entry top, air port (19) is arranged at air outlet slit top.

2. a kind of dome burning type hot-air furnace that has the vertical up-spray burner that is circular layout according to claim 1, it is characterized in that, top equipment manhole (10) is arranged on the said furnace roof (12), and equipment manhole (4) is arranged at body of heater (2) bottom, and refractory masses (5) is arranged in the body of heater (2).

3. a kind of dome burning type hot-air furnace that has the vertical up-spray burner that is circular layout according to claim 1, it is characterized in that the gas preheating circuit (14) that said ceramic burner is vertical and the inlet of combustion-supporting chamber's air preheat circuit (17) are the tangent-type import.

4. a kind of dome burning type hot-air furnace that has the vertical up-spray burner that is circular layout according to claim 1, it is characterized in that, air port of said ceramic burner (19) and gas port (20) are for vertically upward, and its nozzle is rectangle or circle.

5. a kind of dome burning type hot-air furnace that has the vertical up-spray burner that is circular layout according to claim 1, it is characterized in that, said furnace roof (12) adopts the catenary vault, and ceramic burner places the base portion of vault, is supported on body of heater (2) and the ceramic burner body of wall (15).

6. a kind of dome burning type hot-air furnace that has the vertical up-spray burner that is circular layout according to claim 1 is characterized in that, is to intersect on said vertical gas preheating circuit and the vertical air preheat circuit to be provided with a plurality of outlets.

Images