CN214270778U - Purification process device of straw pyrolysis gas - Google Patents
Purification process device of straw pyrolysis gas Download PDFInfo
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- CN214270778U CN214270778U CN202022940888.0U CN202022940888U CN214270778U CN 214270778 U CN214270778 U CN 214270778U CN 202022940888 U CN202022940888 U CN 202022940888U CN 214270778 U CN214270778 U CN 214270778U
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Abstract
The utility model relates to a purification process unit of straw pyrolysis gas, including air-blast tower, scrubbing tower, one-level wet-type electrostatic precipitator, second grade wet-type electrostatic precipitator, water seal tank, oxygen content analysis appearance, hot circulating water system and cold circulating water system. The beneficial effects are as follows: through adopting this utility model device, can solve and use the straw to produce through pyrolysis or gasification as the purification problem of pyrolysis gas, process flow is short, and processing method is simple, high-efficient, easily operation, and the operation is reliable and stable, and power consumption is little, and is energy-concerving and environment-protective, is suitable for maximization, scale, the industrialization of straw pyrolysis technology to promote.
Description
Technical Field
The utility model relates to a living beings pyrolysis gas processing technology field especially relates to a purification process units of straw pyrolysis gas.
Background
At present, the crop straw yield in China exceeds 7 hundred million tons every year, and a large amount of straws are not effectively utilized. The development and utilization of biomass resources represented by crop straws have important significance for protecting the environment, optimizing the energy structure, relieving the supply pressure of fossil energy and the like. Straw is used as a raw material, and combustible gas is produced by adopting a pyrolysis or gasification mode, so that a good way is provided for reasonably utilizing the straw. However, the pyrolysis gas produced by various pyrolysis furnaces and gasification furnaces contains not only gas components such as hydrogen, carbon monoxide, methane, carbon dioxide and nitrogen, but also impurities such as tar and dust, and the use requirements of subsequent users can be met only after the pyrolysis gas is purified by adopting an effective and reasonable purification process.
Chinese utility model patent publication No. CN111073712A discloses "a biomass pyrolysis gas purification and condensate recovery process", which comprises removing carbon particles and ash in the pyrolysis gas with cyclone separator, cooling by three-stage condensation, namely, cooling and condensing the pyrolysis gas by indirect cooling, and washing the pyrolysis gas with extractant to extract and remove tar. Although the technology can theoretically purify the pyrolysis gas and recover condensate in the pyrolysis gas, the following problems still exist when the technology is used for industrial production:
1) the cyclone separator is adopted to remove solid impurities in the gas, and the efficiency of the cyclone separator is difficult to ensure because the inlet gas flow velocity is high and the particle size in the gas is large enough to generate enough centrifugal force, the gas pressure at the outlet of the biomass pyrolysis gas furnace is generally low, the flow velocity is slow, and the particle size in the gas produced by taking the straw as the raw material is small;
2) the high-temperature pyrolysis gas adopts an indirect cooling mode, and is used for industrial production devices with large production scale due to small heat transfer coefficient, the required heat exchange equipment has large volume and high manufacturing cost, in addition, impurities such as tar in the pyrolysis gas are easy to condense and coke on the heat exchange tube, the heat transfer effect is influenced, and the long-term continuous stable production is difficult;
3) the method for removing the tar organic substances in the pyrolysis gas by an extraction mode has the advantages of complex process flow, high operation difficulty, high energy consumption and difficult guarantee of purification efficiency.
In order to widely popularize the straw gas-making process and to make the straw pyrolysis process large-scale, large-scale and industrialized, a simple, economic, efficient and environment-friendly pyrolysis gas purification process must be found.
SUMMERY OF THE UTILITY MODEL
For overcoming the prior art defect, the utility model provides a technical problem provides a purification process units of straw pyrolysis gas, can solve the purification problem that uses the straw to produce through pyrolysis or gasification as the raw materials pyrolysis gas, and process flow is short, and processing method is simple, high-efficient, easily operation, and the operation is reliable and stable, and power consumption is little, and is energy-concerving and environment-protective, is suitable for maximization, scale, the industrialization popularization of straw pyrolysis technology.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a purification process device for straw pyrolysis gas comprises an air spray tower, a washing tower, a primary wet-type electric dust remover, a secondary wet-type electric dust remover, a water seal tank, an oxygen content analyzer, a hot circulating water system and a cold circulating water system, and is characterized in that the air spray tower is of a cavity structure, a pyrolysis gas inlet is formed in the lower portion of the air spray tower, a pyrolysis gas outlet is formed in the upper portion of the air spray tower and is connected with the lower portion of the washing tower, a spray head is arranged on the upper portion of the air spray tower and is connected with the hot circulating water system, a water seal is formed in the bottom of the air spray tower, and the water seal is connected with the hot circulating water system;
the washing tower is internally provided with a plurality of layers of fillers, a spray head is arranged above each layer of fillers and connected with a cold circulating water system, a steam purging port is arranged below each layer of fillers, the upper part of the washing tower is provided with a pyrolysis gas outlet which is connected with the lower part of the primary wet electric dust remover, the lower part of the washing tower is connected with a water seal tank, and the water seal tank is connected with the cold circulating water system;
the top of the first-stage wet electric dust collector is provided with a pyrolysis gas outlet which is connected with the lower part of the second-stage wet electric dust collector, and an oxygen content analyzer is arranged on a connecting pipeline; the bottom of the primary wet-type electric dust collector is connected with a water seal tank, and the water seal tank is connected with a cold circulating water system; the upper part of the primary wet-type electric dust collector is provided with a cold circulating water inlet which is connected with a cold circulating water system;
the top of second grade wet-type electrostatic precipitator is equipped with pyrolysis gas export, bottom and passes through water seal tank and cold circulating water system connection, and second grade wet-type electrostatic precipitator's upper portion is equipped with cold circulating water entry and cold circulating water system connection.
And the oxygen content analyzer is simultaneously electrically interlocked with the first-stage wet electric dust remover and the second-stage wet electric dust remover.
The inner structures of the primary wet electric dust collector and the secondary wet electric dust collector are honeycomb or tubular structures.
And the temperature of the pyrolysis gas at the outlet of the air spray tower is sprayed and cooled to 65-70 ℃ by hot circulating water, and the temperature of the pyrolysis gas at the outlet of the washing tower is cooled to about 35 ℃ by cold circulating water.
The hot circulating water system comprises a circulating water tank, a filtering device, a circulating water pump and an alkali adding facility, and a water cooling tower is not required to be arranged in the hot circulating water system.
The cold circulating water system comprises a circulating water tank, a filtering device, a circulating water pump, a water cooling tower and an alkali adding facility.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the direct cooling is adopted for cooling the pyrolysis gas, the cooling efficiency is high, the operation is stable and reliable, and partial impurities in the pyrolysis gas can be removed while the high-temperature pyrolysis gas is cooled;
2) the cooling water cooling and heat circulating water systems respectively circulate in a closed loop, and the high-temperature pyrolysis gas is cooled in two stages, wherein the first-stage cooling reasonably utilizes the latent heat of evaporation of the cooling water, and the heat circulating water which does not need a water cooling tower for cooling is adopted, so that the working load of the water cooling tower is reduced, and the power consumption is saved;
3) a two-stage wet electric dust collector is adopted, tar and dust are removed by a high-voltage electric field, and the efficiency is high; the precipitation pole of the electric dust collector adopts continuous washing water, thus effectively preventing the deposition of tar and dust and having stable and reliable operation; an oxygen content analyzer is arranged on a pyrolysis gas outlet pipeline of the first-stage wet electric dust remover, and is simultaneously in safe interlocking with the two-stage wet electric dust remover, so that the equipment safety is ensured; the pyrolysis gas at the outlet of the primary wet-type electric precipitator has relatively less impurities, and an oxygen content analyzer is arranged at the outlet of the primary wet-type electric precipitator, so that the online monitoring and the interlocking control are not influenced, and the long-term stability of the operation of the oxygen content analyzer is facilitated;
4) short process flow, simple operation, and suitability for large-scale, large-scale and industrialized popularization of the straw pyrolysis process.
Drawings
Fig. 1 is a schematic view of the process principle of the present invention.
In the figure: 1-air spray tower 2-washing tower 3-primary wet electric dust remover 4-secondary wet electric dust remover 5-water seal tank 6-oxygen content analyzer 7-steam purging port 8-hot circulating water system 9-cold circulating water system
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
the utility model relates to a purification process device of straw pyrolysis gas, which comprises an air spray tower 1, a washing tower 2, a primary wet-type electric precipitator 3, a secondary wet-type electric precipitator 4, a water seal tank 5, an oxygen content analyzer 6, a thermal circulating water system 8 and a cold circulating water system 9, wherein the air spray tower 1 is of a cavity structure, the lower part of the air spray tower is provided with a pyrolysis gas inlet, the upper part of the air spray tower is provided with a pyrolysis gas outlet which is connected with the lower part of the washing tower 2, the upper part of the air spray tower 1 is provided with a spray head which is connected with the thermal circulating water system 8, the bottom of the air spray tower is provided with a water seal, and the water seal is connected with the thermal circulating water system 8;
a plurality of layers of fillers are filled in the washing tower 2, a spray head connected with a cold circulating water system 9 is arranged above each layer of fillers, a steam purging port 7 is arranged below each layer of fillers, a pyrolysis gas outlet is arranged at the upper part of the washing tower 2 and connected with the lower part of the primary wet electric dust remover 3, the lower part of the washing tower is connected with a water seal tank 5, and the water seal tank 5 is connected with the cold circulating water system 9;
the top of the first-stage wet electric dust collector 3 is provided with a pyrolysis gas outlet which is connected with the lower part of the second-stage wet electric dust collector 4, and an oxygen content analyzer 6 is arranged on a connecting pipeline; the bottom of the primary wet-type electric dust collector 3 is connected with a water seal tank 5, and the water seal tank 5 is connected with a cold circulating water system 9; the upper part of the primary wet-type electric dust collector 3 is provided with a cold circulating water inlet which is connected with a cold circulating water system 9;
the top of second grade wet-type electrostatic precipitator 4 is equipped with pyrolysis gas export, the bottom is passed through water seal tank 5 and is connected with cold circulating water system 9, and the upper portion of second grade wet-type electrostatic precipitator 4 is equipped with cold circulating water entry and is connected with cold circulating water system 9.
And the oxygen content analyzer 6 is simultaneously electrically interlocked with the first-stage wet electric dust collector 3 and the second-stage wet electric dust collector 4.
The inner structures of the first-stage wet electric dust collector 3 and the second-stage wet electric dust collector 4 are honeycomb or tubular structures.
The temperature of the pyrolysis gas at the outlet of the air spray tower 1 is cooled to 65-70 ℃ by spraying hot circulating water, and the temperature of the pyrolysis gas at the outlet of the washing tower 2 is cooled to about 35 ℃ by cooling circulating water.
The thermal circulating water system 8 comprises a circulating water tank, a filtering device, a circulating water pump and an alkali adding facility, and a water cooling tower is not required to be arranged in the thermal circulating water system.
The cold circulating water system 9 comprises a circulating water tank, a filtering device, a circulating water pump, a water cooling tower and an alkali adding facility.
The working principle comprises the following steps:
1) high-temperature pyrolysis gas from a pyrolysis furnace enters from the lower part of the air spray tower 1 and moves upwards, and is cooled by thermal circulation cooling water sprayed from top to bottom, the thermal circulation cooling water is in countercurrent contact with the high-temperature pyrolysis gas, part of the thermal circulation cooling water is evaporated and vaporized and absorbs heat of the pyrolysis gas, part of tar and dust are removed while the pyrolysis gas is cooled, and the pyrolysis gas flows out from a pyrolysis gas outlet in the upper part of the air spray tower 1 after the temperature of the pyrolysis gas is reduced to 65-70 ℃;
2) pyrolysis gas from the air spray tower 1 enters from the lower part of the washing tower 2 and moves upwards, and is subjected to mass transfer and heat transfer with cold circulating cooling water sprayed from top to bottom on the surface of the filler, the pyrolysis gas is cooled, tar and dust are further removed, and the pyrolysis gas flows out from a pyrolysis gas outlet at the upper part of the washing tower 2 after the temperature of the pyrolysis gas is reduced to about 35 ℃;
the filling in the washing tower 2 is filled in multiple sections, and a corresponding circulating water spray head is arranged above each section of filling, so that the bias flow of the sprayed cooling water in the descending process can be prevented; a corresponding steam purging port 7 is arranged below each section of the packing and used for purging the packing in the washing tower 2 when the equipment is stopped and overhauled;
3) pyrolysis gas from the washing tower 2 enters from the lower part of the primary wet electric dust remover 3 and moves upwards, after tar and dust in the pyrolysis gas are further removed under the action of a high-voltage electric field, the pyrolysis gas flows from the upper part of the primary wet electric dust remover 3 and enters from the lower part of the secondary wet electric dust remover 4 and moves upwards, the tar and dust in the pyrolysis gas are further removed under the action of the high-voltage electric field, and the qualified pyrolysis gas after cooling and purification is discharged from the top of the secondary wet electric dust remover 4 and is sent to a user or a gas cabinet for storage;
meanwhile, in order to prevent tar and dust in the pyrolysis gas from depositing on the precipitation electrodes in the first-stage electric dust remover 3 and the second-stage electric dust remover 4 and influencing the purification efficiency of the equipment, circulating cooling water is adopted to continuously wash the precipitation electrodes in the first-stage wet electric dust remover 3 and the second-stage wet electric dust remover 4;
4) in order to ensure the production safety, an oxygen content analyzer 6 is arranged on a pyrolysis gas outlet pipeline of the first-stage wet electric dust remover 3, the oxygen content value in the pyrolysis gas is monitored on line, and the oxygen content value and a power supply system of the first-stage wet electric dust remover 3 and the second-stage wet electric dust remover 4 realize interlocking control at the same time, namely when the oxygen content in the pyrolysis gas monitored on line by the oxygen content analyzer 6 reaches a set alarm limit, the alarm is automatically given, and when the oxygen content in the pyrolysis gas reaches a set cut-off limit, a power supply source of the first-stage wet electric dust remover 3 and the second-stage wet electric dust remover 4 is automatically cut off;
5) circulating water adopted by the air spray tower 1 forms an independent hot circulating water system 8, a water cooling tower is not required to be arranged in the system for cooling return water, circulating water discharged from the lower part of the air spray tower 1 flows to a circulating water tank of the hot circulating water system 8 through water seal, and is filtered, deoiled and deslagged, and then is pumped back to the air spray tower 1 by a circulating water pump for recycling; the hot circulating water system 8 is provided with an alkali adding facility, and a certain amount of alkali is added into the circulating water system periodically to neutralize the acidic substances brought into the cooling water by the pyrolysis gas; the tar and ash obtained by precipitation and filtration can be sold as by-products;
6) the washing tower 2, the primary wet electric dust remover 3 and the secondary wet electric dust remover 4 share a cold circulating water system 9, the cold circulating water system 9 needs to be provided with a water cooling tower, the water drained from the lower part of the cold circulating water system 9 automatically flows to a circulating water tank of the cold circulating water system 9 through a water seal groove 5, is filtered, deoiled and deslagged, is pumped to the water cooling tower by a circulating water pump for cooling, and is finally sent back to the washing tower 2, the primary wet electric dust remover 3 and the secondary wet electric dust remover 4 for recycling; the cold circulating water system 9 is provided with an alkali adding facility, and a certain amount of alkali is periodically added into the circulating water system to neutralize the acidic substances brought into the cooling water by the pyrolysis gas; the temperature of the outlet of the pyrolysis gas of the washing tower is about 35 ℃, and tar and ash obtained by precipitation and filtration can be sold as byproducts; a small amount of redundant water in the system is discharged from the cold circulating water system 9 and is sent to a sewage treatment system; the outlet temperature of the pyrolysis gas of the washing tower 2 is about 35 ℃.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. A purification process device for straw pyrolysis gas comprises an air spray tower, a washing tower, a primary wet-type electric dust remover, a secondary wet-type electric dust remover, a water seal tank, an oxygen content analyzer, a hot circulating water system and a cold circulating water system, and is characterized in that the air spray tower is of a cavity structure, a pyrolysis gas inlet is formed in the lower portion of the air spray tower, a pyrolysis gas outlet is formed in the upper portion of the air spray tower and is connected with the lower portion of the washing tower, a spray head is arranged on the upper portion of the air spray tower and is connected with the hot circulating water system, a water seal is formed in the bottom of;
the washing tower is internally provided with a plurality of layers of fillers, a spray head is arranged above each layer of fillers and connected with a cold circulating water system, a steam purging port is arranged below each layer of fillers, the upper part of the washing tower is provided with a pyrolysis gas outlet which is connected with the lower part of the primary wet electric dust remover, the lower part of the washing tower is connected with a water seal tank, and the water seal tank is connected with the cold circulating water system;
the top of the first-stage wet electric dust collector is provided with a pyrolysis gas outlet which is connected with the lower part of the second-stage wet electric dust collector, and an oxygen content analyzer is arranged on a connecting pipeline; the bottom of the primary wet-type electric dust collector is connected with a water seal tank, and the water seal tank is connected with a cold circulating water system; the upper part of the primary wet-type electric dust collector is provided with a cold circulating water inlet which is connected with a cold circulating water system;
the top of second grade wet-type electrostatic precipitator is equipped with pyrolysis gas export, bottom and passes through water seal tank and cold circulating water system connection, and second grade wet-type electrostatic precipitator's upper portion is equipped with cold circulating water entry and cold circulating water system connection.
2. The purification process device of straw pyrolysis gas according to claim 1, wherein the oxygen content analyzer is electrically interlocked and controlled with the primary wet electric precipitator and the secondary wet electric precipitator.
3. The purification process device for straw pyrolysis gas according to claim 1, wherein the internal structures of the primary wet electric precipitator and the secondary wet electric precipitator are honeycomb-type or tubular structures.
4. The straw pyrolysis gas purification process device according to claim 1, wherein the temperature of the pyrolysis gas at the outlet of the air spray tower is cooled to 65-70 ℃ by spraying hot circulating water, and the temperature of the pyrolysis gas at the outlet of the washing tower is cooled to about 35 ℃ by cooling circulating water.
5. The straw pyrolysis gas purification process device according to claim 1, wherein the hot circulating water system comprises a circulating water tank, a filtering device, a circulating water pump and an alkali adding facility, and the hot circulating water system does not need to be provided with a water cooling tower.
6. The straw pyrolysis gas purification process device according to claim 1, wherein the cold circulating water system comprises a circulating water tank, a filtering device, a circulating water pump, a water cooling tower and an alkali adding facility.
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| CN202022940888.0U CN214270778U (en) | 2020-12-10 | 2020-12-10 | Purification process device of straw pyrolysis gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115161077A (en) * | 2022-06-21 | 2022-10-11 | 中冶焦耐(大连)工程技术有限公司 | Straw gasification gas production system and process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115161077A (en) * | 2022-06-21 | 2022-10-11 | 中冶焦耐(大连)工程技术有限公司 | Straw gasification gas production system and process |
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