Tar removing device of biomass gasifier

Abstract

The utility model belongs to the technical field of chemical equipment, and particularly relates to a tar removing device of a biomass gasifier, which comprises a gasifier body, an alkaline washing tower, a water washing tower and a drying tower which are sequentially connected, a first pipeline is arranged between the gasifier body and the alkaline washing tower, and a second pipeline is arranged on one side of the alkaline washing tower. The second pipeline is communicated with the bottom and the top of the alkaline washing tower; a third pipeline is arranged between the alkaline washing tower and the water washing tower; a fifth pipeline is arranged between the water washing tower and the drying tower, and the top of the water washing tower is communicated with the top of the drying tower through the fifth pipeline. According to the utility model, the alkaline washing tower, the water washing tower and the drying tower are arranged, alkali in the alkaline washing tower is also recycled, and water in the water washing tower is also recycled, so that tar generated in the biomass gasification furnace is removed, the quality of mixed gas is improved, and finally, more efficient, environment-friendly and economical biomass energy utilization is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and in particular relates to a tar removal device for a biomass gasifier. Background Art

[0002] In existing biomass gasification tar cracking devices, biomass raw materials are usually converted into mixed gas through a series of orderly thermochemical reaction processes from top to bottom. The specific steps are as follows:

[0003] First, the biomass material is fed into the gasifier from the upper feed port, usually under negative or positive pressure provided by a vacuum pump or a screw blower to ensure a stable airflow in the gasifier. In the initial stage, the biomass encounters a preheated environment in the furnace and begins to undergo a drying process, in which the water is evaporated and latent heat is released. This stage effectively reduces the heat demand for subsequent gasification reactions.

[0004] Next, the biomass enters the dry distillation layer. Under anaerobic or anoxic conditions, the biomass is subjected to high temperature and undergoes pyrolysis reaction, generating volatiles (mainly including mixed gas, tar and wood vinegar) and solid residue (charcoal). The tar produced at this stage is a complex mixture containing a variety of organic compounds. If it is not properly treated, it will cause deposition and blockage problems in the subsequent process.

[0005] Subsequently, the volatiles continue to descend to the oxidation layer. In this environment, part of the carbon comes into contact with oxygen and undergoes an oxidation reaction to produce carbon monoxide, carbon dioxide and heat. This heat provides the necessary heat source for the subsequent reduction layer.

[0006] Finally, the volatile matter reaches the reduction layer, where the remaining carbon and part of the tar undergo reduction reaction with high-temperature water vapor to produce hydrogen, carbon monoxide, carbon dioxide, etc. This is the main link in the biomass gasification process to produce synthesis gas.

[0007] However, due to the short internal airflow path and high speed of some biomass gasifier designs, the mixed gas discharged from the furnace may contain a certain amount of tar, which is not conducive to the subsequent catalytic synthesis of hydrogen and carbon monoxide.

[0008] In view of this, the present utility model is proposed. Utility Model Content

[0009] The utility model provides a tar removal device for a biomass gasification furnace in order to solve the technical problems existing in the prior art.

[0010] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0011] A tar removal device for a biomass gasifier comprises a gasifier body, an alkali washing tower, a water washing tower and a drying tower which are connected in sequence, wherein a first pipeline is arranged between the gasifier body and the alkali washing tower, the top of the gasifier body and the bottom of the alkali washing tower are communicated with each other through the first pipeline, a second pipeline is arranged on one side of the alkali washing tower, and the second pipeline communicates the bottom and the top of the alkali washing tower; a third pipeline is arranged between the alkali washing tower and the water washing tower, the top of the alkali washing tower and the bottom of the water washing tower are communicated with each other through the third pipeline, a fourth pipeline is arranged on one side of the water washing tower, and the fourth pipeline communicates the bottom and the top of the water washing tower; a fifth pipeline is arranged between the water washing tower and the drying tower, and the top of the water washing tower and the top of the drying tower are communicated with each other through the fifth pipeline.

[0012] A feeding system is provided at the top of one side of the gasification furnace body, and a slag discharge system is provided at the bottom.

[0013] The second pipeline is provided with a first alkali washing circulation pump.

[0014] The fourth pipeline is provided with a second water washing circulation pump.

[0015] A first distributor is provided on the top of the alkali washing tower, and the first distributor is connected to the second pipeline.

[0016] A second distributor is provided on the top of the water washing tower, and the second distributor is connected to a fourth pipeline.

[0017] The water washing tower comprises a first water washing tower and a second water washing tower, a sixth pipeline is arranged between the first water washing tower and the second water washing tower, and the top of the first water washing tower and the bottom of the second water washing tower are communicated through the sixth pipeline.

[0018] The third pipeline is arranged on one side of the first water washing tower, and the fourth pipeline is arranged on the other side of the first water washing tower; a seventh pipeline is arranged on one side of the second water washing tower, and the seventh pipeline connects the bottom and the top of the second water washing tower; a third water washing circulation pump is arranged on the seventh pipeline.

[0019] A third distributor is provided on the top of the second water washing tower, and the third distributor is connected to the seventh pipeline.

[0020] An air outlet pipe is arranged at the bottom of the drying tower.

[0021] Beneficial effects of the utility model:

[0022] This application sets up an alkali washing tower, a water washing tower and a drying tower, and the alkali in the alkali washing tower is also recycled, and the water in the water washing tower is also recycled. This process is set up to remove the tar generated in the biomass gasification furnace, improve the quality of the mixed gas, and ultimately achieve more efficient, environmentally friendly and economical biomass energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a biomass gasification furnace tar removal device of the utility model. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of a biomass gasification furnace tar removal device of the utility model. Figure 2 ;

[0025] The numbers are as follows: 1. gasifier body; 11. feeding system; 12. slag discharge system; 2. alkali washing tower; 21. first distributor; 3. water washing tower; 4. drying tower; 41. air outlet pipe; 5. first pipeline; 6. second pipeline; 61. first alkali washing circulation pump; 7. third pipeline; 8. fourth pipeline; 81. second water washing circulation pump; 9. fifth pipeline; 31. first water washing tower; 32. second water washing tower; 33. second distributor; 34. third distributor; 35. sixth pipeline; 36. seventh pipeline; 37. third water washing circulation pump. DETAILED DESCRIPTION

[0026] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0027] Example 1

[0028] A biomass gasifier tar removal device comprises a gasifier body 1, an alkali washing tower 2, a water washing tower 3 and a drying tower 4 which are connected in sequence. A first pipeline 5 is arranged between the gasifier body 1 and the alkali washing tower 2. The top of the gasifier body 1 and the bottom of the alkali washing tower 2 are connected through the first pipeline 5. The first pipeline 5 is used to remove tar and mixed gas (CO, H 2 and CO 2 ) is transported to the alkali washing tower 2 for alkali washing. A second pipeline 6 is provided on one side of the alkali washing tower 2, and the second pipeline 6 is connected to the bottom and the top of the alkali washing tower 2. A first distributor 21 is provided on the top of the alkali washing tower 2, and the first distributor 21 is connected to the second pipeline 6. The second pipeline 6 is provided with a first alkali washing circulation pump 61 for recycling the alkali solution in the alkali washing tower 2.

[0029] A third pipeline 7 is provided between the alkali washing tower 2 and the water washing tower 3. The top of the alkali washing tower 2 is connected to the bottom of the water washing tower 3 through the third pipeline 7. At this time, most of the CO 2 and tar have been removed, CO, H 2 and a small amount of CO 2 The water is transported to the water washing tower 3 through the third pipeline 7. A fourth pipeline 8 is provided on one side of the water washing tower 3, and the fourth pipeline 8 connects the bottom and the top of the water washing tower 3. A second distributor 33 is provided on the top of the water washing tower 3, and the second distributor 33 is connected to the fourth pipeline 8. The fourth pipeline 8 is provided with a second water washing circulation pump 81 for reusing the water in the water washing tower 3.

[0030] A fifth pipeline 9 is provided between the water washing tower 3 and the drying tower 4, and the top of the water washing tower 3 is connected to the top of the drying tower 4 through the fifth pipeline 9. The entrained alkali and the remaining tar are removed through the water washing tower 3, leaving CO, H 2 , small amount of CO 2 The gas and moisture are transported to the drying tower 4 through the fifth pipeline 9, and the gas is dried by the drying filler in the drying tower 4.

[0031] A feeding system 11 is provided at the top of one side of the gasifier body 1 for conveying biomass raw materials into the top of the gasifier body 1, and a slag discharge system 12 is provided at the bottom for discharging carbon slag and the like out of the gasifier body 1. An outlet pipe 41 is provided at the bottom of the drying tower 4 for discharging the dried CO and H 2 and a small amount of CO 2 Discharge from drying tower 4 and use for synthesis.

[0032] Example 2

[0033] A biomass gasifier tar removal device comprises a gasifier body 1, an alkali washing tower 2, a first water washing tower 31, a second water washing tower 32 and a drying tower 4 connected in sequence, a first pipeline 5 is arranged between the gasifier body 1 and the alkali washing tower 2, the top of the gasifier body 1 and the bottom of the alkali washing tower 2 are connected through the first pipeline 5, and the tar and mixed gas (CO, H) generated in the gasifier body 1 are removed from the gasifier body 1. 2 and CO 2 ) is transported to the alkali washing tower 2 for alkali washing. A second pipeline 6 is provided on one side of the alkali washing tower 2, and the second pipeline 6 is connected to the bottom and the top of the alkali washing tower 2. A first distributor 21 is provided on the top of the alkali washing tower 2, and the first distributor 21 is connected to the second pipeline 6. The second pipeline 6 is provided with a first alkali washing circulation pump 61 for recycling the alkali solution in the alkali washing tower 2.

[0034] A third pipeline 7 is provided between the alkali washing tower 2 and the first water washing tower 31. The top of the alkali washing tower 2 is connected to the bottom of the first water washing tower 31 through the third pipeline 7. At this time, most of the CO 2 and tar have been removed, CO, H 2 and a small amount of CO 2 The water is transported to the first water washing tower 31 through the third pipeline 7. A fourth pipeline 8 is provided on one side of the first water washing tower 31, and the fourth pipeline 8 connects the bottom and the top of the first water washing tower 31. A second distributor 33 is provided on the top of the first water washing tower 31, and the second distributor 33 is connected to the fourth pipeline 8. A second water washing circulation pump 81 is provided on the fourth pipeline 8 for reusing the water in the first water washing tower 31.

[0035] A sixth pipeline 35 is provided between the first water washing tower 31 and the second water washing tower 32, and the top of the first water washing tower 31 and the bottom of the second water washing tower 32 are connected through the sixth pipeline 35. The third pipeline 7 is provided on one side of the first water washing tower 31, and the fourth pipeline 8 is provided on the other side of the first water washing tower 31; a seventh pipeline 36 is provided on one side of the second water washing tower 32, and the seventh pipeline 36 communicates the bottom and the top of the second water washing tower 32; a third distributor 34 is provided on the top of the second water washing tower 32, and the third distributor 34 is connected to the seventh pipeline 36, and the seventh pipeline 36 is provided with a third water washing circulation pump 37 for reusing the water in the second water washing tower 32. The second water washing tower 32 is provided to remove alkali liquor and tar more thoroughly.

[0036] A fifth pipeline 9 is provided between the second water washing tower 32 and the drying tower 4, and the top of the second water washing tower 32 is connected to the top of the drying tower 4 through the fifth pipeline 9. After the alkali and tar are removed by the first water washing tower 31 and the second water washing tower 32, CO, H 2 The gas and the entrained moisture are transported to the drying tower 4 through the fifth pipeline 9, and the gas is dried by the drying filler in the drying tower 4.

[0037] A feeding system 11 is provided at the top of one side of the gasifier body 1 for conveying biomass raw materials into the top of the gasifier body 1, and a slag discharge system 12 is provided at the bottom for discharging carbon slag and the like out of the gasifier body 1. An outlet pipe 41 is provided at the bottom of the drying tower 4 for discharging the dried CO and H 2 and a small amount of CO 2 Discharge from drying tower 4 and use for synthesis.

[0038] The present application sets up an alkali washing tower 2, a water washing tower 3 (including a first water washing tower 31 and a second water washing tower 32) and a drying tower 4, and the alkali in the alkali washing tower 2 is also recycled, and the water in the water washing tower 3 (the first water washing tower 31 and the second water washing tower 32) is also recycled. This process is set up to remove the tar generated in the biomass gasification furnace, improve the quality of the mixed gas, and ultimately achieve more efficient, environmentally friendly and economical biomass energy utilization.

[0039] The above content is a further detailed description of the technical solution provided in combination with the preferred implementation methods of this patent. It cannot be determined that the specific implementation of the utility model is limited to the above descriptions. For ordinary technicians in the technical field to which this patent belongs, without departing from the concept of this patent, they can also make several simple deductions or substitutions, which should be deemed to fall within the scope of protection of this patent.

Claims

1. A biomass gasifier detarring device, characterized in that: It includes a gasifier body, an alkali washing tower, a water washing tower and a drying tower connected in sequence. A first pipeline is provided between the gasifier body and the alkali washing tower, the top of the gasifier body is connected to the bottom of the alkali washing tower through the first pipeline, and a second pipeline is provided on one side of the alkali washing tower, the second pipeline is connected to the bottom and the top of the alkali washing tower; A third pipeline is provided between the alkali washing tower and the water washing tower, the top of the alkali washing tower is connected to the bottom of the water washing tower through the third pipeline, and a fourth pipeline is provided on one side of the water washing tower, the fourth pipeline is connected to the bottom and the top of the water washing tower; A fifth pipeline is provided between the water washing tower and the drying tower, and the top of the water washing tower is communicated with the top of the drying tower through the fifth pipeline.

2. A biomass gasifier detarring device as claimed in claim 1, characterized in that: A feeding system is provided at the top of one side of the gasification furnace body, and a slag discharge system is provided at the bottom.

3. The biomass gasifier detarring device according to claim 1, characterized in that: The second pipeline is provided with a first alkali washing circulation pump.

4. The biomass gasifier detarring device according to claim 1, characterized in that: The fourth pipeline is provided with a second water washing circulation pump.

5. The tar removal device for a biomass gasifier according to claim 1, characterized in that: A first distributor is provided on the top of the alkali washing tower, and the first distributor is connected to the second pipeline.

6. The tar removal device for a biomass gasifier according to claim 1, characterized in that: A second distributor is provided on the top of the water washing tower, and the second distributor is connected to a fourth pipeline.

7. The biomass gasifier detarring device according to claim 1, characterized in that: The water washing tower comprises a first water washing tower and a second water washing tower, a sixth pipeline is arranged between the first water washing tower and the second water washing tower, and the top of the first water washing tower and the bottom of the second water washing tower are communicated through the sixth pipeline.

8. A biomass gasifier detarring device as claimed in claim 7, characterized in that: The third pipeline is arranged on one side of the first water washing tower, and the fourth pipeline is arranged on the other side of the first water washing tower; a seventh pipeline is arranged on one side of the second water washing tower, and the seventh pipeline connects the bottom and the top of the second water washing tower; a third water washing circulation pump is arranged on the seventh pipeline.

9. A biomass gasifier detarring device as claimed in claim 8, characterized in that: A third distributor is provided on the top of the second water washing tower, and the third distributor is connected to the seventh pipeline.

10. A tar removal device for a biomass gasifier according to any one of claims 1 to 9, characterized in that: An air outlet pipe is arranged at the bottom of the drying tower.

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