CN210826072U - Mixed air distribution system of gas producer - Google Patents

Abstract

The utility model discloses a mixed air distribution system of a gas producer, belonging to the technical field of coal gasification. Low to among the prior art gas producer carbon conversion, the problem that the flying dust is difficult to cyclic utilization, the utility model provides a mixed cloth wind system of gas producer, it includes low temperature reaction district and the high temperature slag district that this internal bottom from the top down set gradually of producer, be provided with between low temperature reaction district and the high temperature slag district and alleviate the district, alleviate the district including steam inlet, steam inlet is connected with steam distribution plate, be provided with a plurality of steam nozzle on the steam distribution plate, the high temperature slag district includes return ash pipe and the setting outside air intake pipe of returning ash pipe that is connected with steam distribution plate. The utility model recycles the fly ash and greatly improves the carbon conversion rate; the whole structure is simple, and the production cost is low.

Description

Mixed air distribution system of gas producer

Technical Field

The utility model belongs to the technical field of coal gasification, more specifically say, relate to a mixed air distribution system of gas producer.

Background

China has abundant coal resource reserves, the predicted geological reserves exceed 4.5 trillion tons, and the method is the first major world coal production country, and the coal resources still occupy an important position in the energy structure of China. How to economically, cleanly and efficiently utilize coal becomes a great technical problem of coal utilization at the present stage. The prior clean coal gas production technology comprises two main types of circulating fluidized bed coal gasification technology and fluidized bed coal gasification technology. The circulating fluidized bed gas producer has the advantages of simple structure and stable system operation. Meanwhile, the fluidized bed gas producer does not contain pollutants such as tar, phenol water and the like in the operation process, and is a cleaner coal gas producer. But the operation temperature of the fluidized bed gas producer is low and is generally 950 ℃, the carbon conversion rate of coal in the gasifier is low, the carbon content of fly ash is high, and the carbon content of the fly ash is generally about 50-70%; fly ash with high carbon content is a solid waste that is difficult to dispose of. The entrained flow bed gas producer has the advantages of high carbon conversion rate and no pollution such as tar, phenol water and the like. But the entrained flow bed needs to be added with devices for coal grinding, oxygen generation, coal powder conveying and the like, so that the investment cost of the entrained flow bed is greatly increased; the investment cost of the general entrained flow bed is more than 5 times of that of the fluidized bed with the same scale; and the fly ash generated in the gasification process of the two generation furnaces is difficult to utilize, and the carbon conversion rate is low.

The gas distribution and steam integrated gas producer comprises a hearth, a hopper, a flue, an air outlet pipe and a bridge, wherein the hopper, the flue and the air outlet pipe are arranged on the hearth, the bridge is arranged at the bottom of the hearth, a high-pressure fan is arranged outside the hearth, the high-pressure fan is connected with a nozzle arranged below the bridge through an air inlet pipe, a gas distributor is arranged on the nozzle and arranged on the bridge, a water inlet pipe is arranged at the bottom end of the gas distributor, the pipe orifice of the water inlet pipe is opposite to the nozzle, and a plurality of gas distribution holes are formed in the upper end of the gas distributor. The gas distributor is a device for preparing water vapor, the device has simple structure and convenient use, and the water quantity entering the nozzle can be manually controlled because the water inlet pipe is provided with the water quantity control valve, so the gas producer ensures the supply and control of the water vapor. The efficiency of the gas producer is improved. The disadvantages of the patent are that: the fly ash with high carbon content generated in the conversion process in the furnace is difficult to treat and has higher cost.

Also, as shown in chinese patent application No. CN200420011886.1, published as 11.5.2005, this patent discloses a mixed gas generating furnace, which comprises a furnace body consisting of a furnace top, an inner furnace body and an outer furnace body, wherein a water jacket is provided between the inner and outer furnace bodies, a water inlet and a steam outlet are provided on the water jacket, a coal feeder is provided on the furnace top of the furnace body, a gas outlet is provided on the furnace body, a rotary grate is provided at the lower part inside the furnace body, the rotary grate is fixed inside an ash tray, a steam inlet communicated with the rotary grate is provided at the bottom of the ash tray, and a steam outlet provided on the water jacket is communicated with the steam inlet communicated with the rotary grate. Because the inner furnace body of the mixed gas producer is provided with the heated pipe communicated with the water jacket, the heated area of water is increased, the steam yield is improved, the steam produced by the mixed gas producer can meet the requirement of converting fire coal into coal gas, and the coal gas yield is further improved. The disadvantages of the patent are that: although the conversion efficiency of coal can be effectively improved, more fly ash is generated in the conversion process.

Disclosure of Invention

1. Problems to be solved

Aiming at the problems of low carbon conversion rate and difficult cyclic utilization of fly ash of the gas producer in the prior art, the utility model provides a mixed air distribution system of the gas producer. The fly ash that the mixed air distribution system of gas producer produced in with gasification process recycles, improved the whole carbon conversion rate of gas producer greatly, practice thrift manufacturing cost for the enterprise.

2. Technical scheme

In order to solve the above problems, the utility model adopts the following technical proposal.

The utility model provides a mixed cloth wind system of gas producer, includes that this internal bottom from the top down of producer sets gradually raw materials coal carries out the low temperature reaction zone that reacts and the high temperature slag zone that the flying ash reacts, is provided with between low temperature reaction zone and the high temperature slag zone and mitigatees the zone, mitigatees the zone including steam inlet, and steam inlet is connected with the steam distribution board, is provided with a plurality of steam jet on the steam distribution board, and the high temperature slag zone includes the return ash pipe of being connected with the steam distribution board and sets up at the outside air intake pipe of return ash pipe. The fly ash is recycled, the overall carbon conversion rate of the producer is improved, and the production cost is greatly saved.

Furthermore, the moderating zone also comprises a steam chamber, one side of the steam chamber is provided with a steam inlet, and the top of the steam chamber is provided with a steam distribution plate. The setting of steam chamber can make steam go out from even distribution in the steam spout, improves the reaction efficiency of steam.

Further, the vapor distribution plate is in a V shape. The fluidity of the solid particles is facilitated, the solid particles are fully contacted with steam, and the reaction is full.

Furthermore, the air inlet pipe comprises an air inlet pipe body, an air inlet arranged at the bottom of the air inlet pipe body and a material returning and mixing prevention device arranged in the air inlet pipe body. Avoid solid particle to take place to return the cluster, provide work efficiency.

Furthermore, the ash returning pipe comprises an ash returning pipe main body connected with the anti-returning and material mixing device, and an ash returning pipe inlet is formed in the ash returning pipe main body. The ash conveying process is complete and the operation is simple.

Furthermore, the anti-return material mixing device comprises an upper baffle plate connected with the air inlet pipe body and a lower baffle plate connected with the ash return pipe body. The solid materials in the furnace are prevented from falling into the air inlet pipe.

Furthermore, the upper baffle and the lower baffle are both in a round table shape or a funnel shape. Simple structure, it is easily fixed, make things convenient for solid particle to be blown by high temperature air and play.

Furthermore, the lower part of the air inlet pipe body is provided with an expansion joint. The protection intake pipe body does not receive high temperature air wearing and tearing, improves the life of intake pipe body.

Furthermore, the low-temperature reaction zone comprises a distribution plate main body arranged at the bottom in the gasification furnace body, a plurality of blast caps are arranged on the distribution plate main body, and a refractory material is filled between every two adjacent blast caps. The low-temperature reaction zone has high working efficiency and the service life of parts is long.

Furthermore, the hood is a mushroom head hood or a bell-shaped hood. Simple structure and wide application range.

3. Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model is provided with a low temperature reaction area for gasification and slag discharge of the gasification furnace, a high temperature slag area for slag reaction of fly ash and high temperature air, and a buffer area between the two areas, wherein the three areas form an air distribution system together; the system can save 600KG of raw coal when producing ten thousand standard of gas per hour, namely, the system can save about 17% of raw coal per hour compared with a conventional gas producer, and the economic benefit is very obvious;

(2) the steam distribution plate of the utility model is connected in a V shape, which is beneficial to the flow of solid coal particles in the low temperature reaction zone and slag in the high temperature reaction zone in the buffer zone, so that the contact and the reaction are sufficient; two inclined conical surfaces in the steam distribution plate respectively form an included angle of 30-50 degrees with the axis of the steam distribution plate, so that the flow of solid particles is further facilitated; the steam distribution plate is easy to be installed inconveniently because the integral height of the steam distribution plate is too high due to too small included angle; the included angle is too large, so that the solid particles cannot easily flow on the steam distribution plate;

(3) the air inlet pipe in the utility model comprises an inlet pipe body which is a straight pipe, so that the high-temperature air can be conveniently input, and the input is smooth; high-temperature air enters the gasification furnace body through an air inlet at the bottom of the air inlet pipe body, so that the high-temperature air enters from bottom to top and is not easy to disperse; the anti-return material mixing device in the gas inlet pipe body prevents solid particles in the gasification furnace body from being mixed, so that the working efficiency of the gasification furnace body is improved;

(4) the anti-return material stringing device increases the flowing resistance of solid particles, avoids the problem that the particles are accumulated to influence the conveying of high-temperature air due to the fact that the solid particles fall into the lower part in the air inlet pipe body and the problem that the conveying of the high-temperature air needs manual cleaning, and can easily blow up the solid particles accumulated on the anti-return material stringing device by the high-temperature air in the air inlet pipe body to carry out secondary reaction when the high-temperature air is conveyed on the other hand, thereby improving the gas conversion rate;

(5) the low-temperature zone comprises a distribution plate main body arranged at the bottom in the gasification furnace body and used for reacting raw material coal with a gasification agent, a plurality of hoods are arranged on the distribution plate main body, the arrangement of the hoods avoids the deposition of solid coal particles, reduces the carbon-containing loss of cold slag and can uniformly distribute air; the refractory material is filled between the two adjacent blast caps, so that the distribution plate main body is prevented from deforming in the reaction process, and the service life of the air distribution plate main body is further prolonged.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a method diagram of section A of FIG. 1;

FIG. 3 is a schematic structural diagram of three regions of the present invention;

FIG. 4 is a schematic view of an outer ring-homofluidized distribution apparatus;

FIG. 5 is a schematic view of the working principle of the present invention;

fig. 6 is a schematic structural view of the anti-return material mixing device.

In the figure: 1. an outer ring uniform fluidization distribution device; 11. a distribution plate main body; 12. a hood; 13. a refractory material; 2. a vapor distribution device; 21. a steam distribution plate; 22. a steam jet; 23. a steam chamber; 24. a steam inlet; 3. an air inlet pipe; 31. an air inlet pipe body; 32. the material returning and mixing prevention device; 321. an upper baffle plate; 322. a lower baffle plate; 33. an air inlet; 4. an ash returning pipe; 41. an ash returning pipe body; 42. and an inlet of an ash returning pipe.

Detailed Description

The invention will be further described with reference to specific embodiments and drawings.

Example 1

As shown in fig. 1, 2, 3 and 5, a mixed air distribution system of a gas producer comprises a low-temperature reaction zone and a high-temperature slag zone, wherein the low-temperature reaction zone and the high-temperature slag zone are sequentially arranged at the bottom of a producer body from top to bottom and are used for reacting raw material coal, specifically, the low-temperature reaction zone is mainly used for carrying out the gasification process of the raw material coal and producing fly ash with high carbon content in the gasification process, the fly ash produced in the process and crude gas are discharged from the producer body together, and solid coal particles which are not completely reacted are left in the low-temperature reaction zone; the high-temperature slag zone is used for carrying out slag reaction of fly ash and high-temperature air, wherein the fly ash is the fly ash discharged from the gasification furnace body, and the fly ash enters the gasification furnace body again for cyclic utilization after being collected and treated; a moderation zone is arranged between the low-temperature reaction zone and the high-temperature slag zone, the moderation zone comprises a steam inlet 24, the steam inlet 24 and a steam distribution plate 21, a plurality of steam nozzles 22 are arranged on the steam distribution plate 21, a steam chamber 23 and the steam inlet 24 form a steam distribution device 2, more specifically, the moderation zone also comprises a steam chamber 23, one side of the steam chamber 23 is provided with the steam inlet 24, and the top of the steam chamber 23 is provided with the steam distribution plate 21; steam enters the steam chamber 23 through the steam inlet 24 and then enters the low-temperature reaction region through the steam nozzle 22, and the steam is uniformly distributed from the steam nozzle 22 through the arrangement of the steam chamber 23, so that the reaction efficiency of the steam is improved; the addition of steam isolates a high-temperature slag zone and a low-temperature reaction zone to a certain extent, so that a buffer zone is formed, and solid coal particles in the low-temperature reaction zone can be converted with fly ash slag in the high-temperature slag zone due to the existence of steam in the buffer zone, so that the water-gas reaction is improved, and the carbon conversion rate in the gasifier body is improved; the high-temperature slag zone comprises an ash return pipe 4 connected with the lower end of the steam distribution plate 21 and an air inlet pipe 3 arranged outside the ash return pipe 4, the medium in the air inlet pipe 3 is high-temperature air, and the high-temperature air refers to air with the air temperature of 500-700 ℃; the high-temperature air reacts with fly ash in the ash return pipe 4 at the upper part of the air inlet pipe 3, and a high-temperature slag area is formed below the steam distribution plate 21; preferably, the ash returning pipe 4 and the air inlet pipe 3 are coaxially arranged, and the coaxial arrangement can enable the overall reaction to have better uniformity; and the ash returning pipe 4 and the air inlet pipe 3 are both arranged at the center of the lower part of the steam distribution plate 21, so that the fly ash is uniformly and fully contacted with the steam, the water gas reaction is promoted, and the carbon conversion rate is effectively improved.

The mixed air distribution system of the gas producer is characterized in that high carbon-containing fly ash generated in the gasification reaction process is treated and then enters the gasifier body again, the fly ash is recycled, the mixed air distribution system comprises a low-temperature reaction zone, a buffer zone and a high-temperature slag zone, the low-temperature reaction zone is used for gasifying raw materials and discharging slag, the high-temperature slag zone is used for carrying out slag reaction on the fly ash and high-temperature air, the buffer zone is arranged between the fly ash and the high-temperature air, and steam in the buffer zone can isolate the low-temperature reaction zone and the high-temperature slag zone to a certain extent on the one hand, so that the temperature at the bottom of the whole gasifier is not prone to being damaged; on the other hand, the water vapor in the buffer area mutually converts the coal coke particles in the low-temperature reaction area and the slag in the high-temperature slag area, so that the combination of high-temperature slag and solid slag discharge is realized, the water gas reaction is improved, and the carbon conversion rate of the gasification furnace is further improved; through measurement, the coal gas producer mixed air distribution system can save 600KG of raw coal when producing ten thousand standard square coal gas per hour, namely, the raw coal can be saved by about 17% per hour compared with the conventional coal gas producer, and the economic benefit is very obvious; the situation that the prior air distribution device can only carry out raw material coal gasification reaction but can not carry out fly ash reaction is changed, the whole structure is simple, the manufacturing and the installation are convenient, and the whole coal gasification efficiency is effectively improved.

Example 2

Basically as in example 1, preferably, the steam distribution plate 21 is "V" shaped, that is, the steam distribution plate 21 includes two inclined conical surfaces, and the two inclined conical surfaces are connected in a "V" shape, so that the steam distribution plate 21 has a certain inclination, which is beneficial to the flow of the solid coal particles in the warm reaction zone and the slag in the high temperature reaction zone in the buffer zone, so that the solid coal particles and the slag can fully contact and react with the steam, thereby improving the reaction efficiency; furthermore, the two inclined conical surfaces in the steam distribution plate 21 respectively form an included angle of 30-50 degrees with the axis of the steam distribution plate 21, so that the flow of solid particles is further facilitated; too small included angle means too steep taper of the oblique conical surface, resulting in higher overall height of the whole steam distribution plate 21 and waste of space; too large included angle means too gentle cone angle of the oblique cone surface, and the material is not easy to flow on the steam distribution plate 21; the diameter of a steam nozzle 22 on the steam distribution plate 21 is 2-10 mm, the direction of the steam nozzle 22 is horizontal inward, and the blockage of solid particles is easily caused when the diameter of the steam nozzle 22 is too small, so that the reaction process is influenced; the too large aperture makes the fly ash easy to disperse, insufficient contact with solid particles and incomplete reaction.

Example 3

Basically as in embodiment 1, preferably, the air inlet pipe 3 includes an air inlet pipe body 31, and the air inlet pipe body 31 is a straight pipe, so as to facilitate the input of high-temperature air and make the input of high-temperature air smooth; furthermore, an expansion joint is arranged at the lower part of the air inlet pipe body 31 and is used for supplementing the pipeline expansion of the air inlet pipe body 31, so that the service life of the air inlet pipe body 31 is prolonged; the air inlet 33 is arranged at the bottom of the air inlet pipe body 31, the anti-return material mixing device 32 is arranged in the air inlet pipe body 31, and the air inlet 33 is arranged at the bottom of the air inlet pipe body 31, so that high-temperature air enters from bottom to top due to the high-temperature air entering into the air inlet pipe body 31, the high-temperature air is not easy to shunt, and the heat loss is reduced; the anti-return string material device 32 can effectively avoid the situation that materials in the gasification furnace body are subjected to string returning, and effectively improve the working efficiency, specifically, the ash returning pipe 4 comprises an ash returning pipe main body 41 connected with the anti-return string material device 32, an ash returning pipe inlet 42 is arranged at the bottom of the ash returning pipe main body 41, and the ash returning pipe main body 41 is also a straight pipe, so that the smooth conveying of fly ash is ensured; the lower part of the ash returning pipe body 41 is fixedly welded with the air inlet pipe body 31, so that the connection relationship between the two pipes is stable; the anti-return material mixing device 32 of the present invention is a device capable of preventing solid particles from falling down when the air inlet pipe main body 31 stops working;

as shown in fig. 6, in this embodiment, the anti-return material mixing device 32 includes an upper baffle 321 connected to the air inlet pipe body 31 and a lower baffle 322 connected to the ash return pipe body 41, specifically, the upper baffle 321 and the lower baffle 322 are both in a circular truncated cone shape or a funnel shape, so that the solid particles staying on the upper baffle 3221 and the lower baffle 322 are blown by the high-temperature air; specifically, the circular truncated cone-shaped upper baffle 321 and the air inlet pipe body 31 are in a welded and sealed state, and a certain gap is formed between the circular truncated cone-shaped upper baffle and the ash return pipe main body 41; the lower baffle plate 322 in the shape of a circular truncated cone is in a welded and sealed state with the ash return pipe main body 41, and a certain gap is formed between the lower baffle plate and the air inlet pipe main body 31; the high-temperature air in the air inlet pipe body 31 can enter the gasification furnace body only through the two gaps; solid particles inevitably fall into the air inlet pipe body 31 in the gasification reaction process of the gasification furnace, when the gasification furnace is in a normal working state, high-temperature air is blown from the lower direction in the air inlet pipe body 31 all the time, so the solid particles cannot fall into the air inlet pipe body 31, but when the furnace is shut down or the high-temperature air is stopped in a fire suppression stage, the solid particles fall into the air inlet pipe body 31 due to the self gravity, the resistance of the solid particle flow is increased due to the arrangement of the upper and lower truncated cone-shaped baffles, the problem that the particles are accumulated too much and cannot be blown up easily due to the fact that the solid particles fall into the lower part of the air inlet pipe body 31 is solved, and the labor cost is saved; on the other hand, when high-temperature air is conveyed, the high-temperature air in the air inlet pipe body 31 can easily blow up the solid particles accumulated on the anti-return material mixing device 32 for secondary reaction, so that the gas conversion rate is improved; furthermore, the distance between the inner edge of the upper baffle 321 and the ash return pipe body 41 is smaller than the distance between the outer edge of the lower baffle 322 and the ash return pipe body 41, so that the solid particles in the upper baffle 321 can only fall into the lower baffle 322 and cannot fall into the lower part of the air inlet pipe body 31, and the distance between the upper baffle and the lower baffle can be reasonably set according to the repose angle of an object, so that the solid particles cannot fall from the lower baffle 322 to the lower part of the air inlet pipe body 31, wherein the repose angle is the maximum angle at which the materials can be kept statically stacked when stacked in a natural state.

Example 4

Basically as in example 1, preferably as shown in fig. 4, the low-temperature reaction zone includes a distribution plate main body 11 disposed at the bottom inside the gasifier body, a plurality of hoods 12 are disposed on the distribution plate main body 11, the plurality of hoods 12 are annularly disposed on the distribution plate main body 11, and the arrangement of the hoods 12 can avoid deposition of solid coal particles, reduce carbon loss of cold slag, improve reaction efficiency, and uniformly distribute air; refractory materials 13 are filled between two adjacent blast caps 12, and the refractory materials 13 prevent the distribution plate main body 11 from deforming in the reaction process, so that the service life of the air distribution plate main body 11 is further prolonged; the distribution plate main body 11, the blast cap 12 and the refractory material 13 jointly form an outer ring uniform fluidization distribution device 1, so that the device enables the gasification reaction of raw coal to be sufficient, the service life of the whole device is prolonged, and the maintenance and replacement times are reduced. Furthermore, the hood 12 is a mushroom head hood or a bell-shaped hood, and the hood 12 of this type can realize uniform air distribution and has a simple structure and a wide application range.

Example 5

A method of operating a gas producer hybrid air distribution system as described in any of embodiments 1-4 above, comprising the steps of:

raw material coal enters a low-temperature reaction zone in a gasification furnace body to react, fly ash generated after the reaction is discharged out of the gasification furnace body along with coal gas, and solid coal particles stay in the low-temperature reaction zone;

secondly, the fly ash after reaction is collected and then enters the gasification furnace body through an ash returning pipe 4, high-temperature air is added into the air inlet pipe 3, and the high-temperature air and the fly ash react at the upper part of the air inlet pipe 3 to form molten slag to form a high-temperature molten slag area; specifically, the fly ash enters the gasification furnace body from the ash return pipe 4 in a pipeline pneumatic transportation mode, and the fly ash enters the gasification furnace body in the pipeline pneumatic transportation mode, so that the fly ash is conveyed intensively, the conveying efficiency is high, the fly ash is prevented from being dispersed, and the cleanness of the working environment is effectively improved;

and (III) adding steam from a steam inlet 24 while the step (II) is carried out, wherein the steam enters the gasification furnace body through a steam nozzle 22 on a steam distribution plate 21, and at the moment, the solid coal particles in the low-temperature reaction region and the slag in the high-temperature slag region are mutually converted to generate coal gas again.

The method is simple and convenient to operate, large-scale equipment is not required to be added, the production cost of an enterprise is reduced, the fly ash generated in the gasification process is recycled into the gasification furnace body for secondary reaction, the carbon conversion rate in the whole generation furnace is effectively improved, the fly ash is recycled, and a solution is provided for the treatment of the fly ash; and the overall carbon conversion rate in the gasification furnace is effectively improved, and the method has high use value.

The examples of the utility model are only right the utility model discloses a preferred embodiment describes, and not right the utility model discloses design and scope are injectd, do not deviate from the utility model discloses under the prerequisite of design idea, the field engineering technical personnel are right the utility model discloses a various deformation and improvement that technical scheme made all should fall into the protection scope of the utility model.

Claims (10)

1. A mixed air distribution system of a gas producer is characterized in that: the low temperature reaction zone that the raw materials coal that sets gradually including the bottom in the producer body from the top down reacts and the high temperature slag zone that the flying ash reacts, is provided with between low temperature reaction zone and the high temperature slag zone and mitigatees the district, mitigatees the district including steam inlet (24), steam inlet (24) are connected with steam distribution plate (21), are provided with a plurality of steam spout (22) on steam distribution plate (21), and the high temperature slag zone includes return ash pipe (4) of being connected with steam distribution plate (21) and sets up in return ash outside air intake pipe (3) of pipe (4).

2. The mixed air distribution system of the gas producer of claim 1, which is characterized in that: the moderating zone also comprises a steam chamber (23), one side of the steam chamber (23) is provided with a steam inlet (24), and the top of the steam chamber (23) is provided with a steam distribution plate (21).

3. The mixed air distribution system of the gas producer of claim 2, which is characterized in that: the steam distribution plate (21) is V-shaped.

4. The mixed air distribution system of the gas producer of claim 1, which is characterized in that: the air inlet pipe (3) comprises an air inlet pipe body (31), an air inlet (33) arranged at the bottom of the air inlet pipe body (31), and a material returning and mixing prevention device (32) arranged in the air inlet pipe body (31).

5. The mixed air distribution system of the gas producer of claim 4, wherein: the ash returning pipe (4) comprises an ash returning pipe main body (41) connected with the material returning prevention device (32), and an ash returning pipe inlet (42) is arranged on the ash returning pipe main body (41).

6. The mixed air distribution system of the gas producer of claim 5, wherein: the anti-return material mixing device (32) comprises an upper baffle (321) connected with the air inlet pipe body (31) and a lower baffle (322) connected with the ash return pipe main body (41).

7. The mixed air distribution system of the gas producer of claim 6, wherein: the upper baffle (321) and the lower baffle (322) are both in a circular truncated cone shape or a funnel shape.

8. The mixed air distribution system of the gas producer of claim 5 or 6, which is characterized in that: and an expansion joint is arranged at the lower part of the air inlet pipe body (31).

9. The mixed air distribution system of the gas producer of claim 1, which is characterized in that: the low-temperature reaction zone comprises a distribution plate main body (11) arranged at the bottom in the gasification furnace body, a plurality of blast caps (12) are arranged on the distribution plate main body (11), and a refractory material (13) is filled between every two adjacent blast caps (12).

10. The mixed air distribution system of the gas producer of claim 9, wherein: the hood (12) is a mushroom head hood or a bell-shaped hood.

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