CN212842998U - Dust removal system for smelting high-temperature coal gas - Google Patents
Dust removal system for smelting high-temperature coal gas Download PDFInfo
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- CN212842998U CN212842998U CN202021739153.5U CN202021739153U CN212842998U CN 212842998 U CN212842998 U CN 212842998U CN 202021739153 U CN202021739153 U CN 202021739153U CN 212842998 U CN212842998 U CN 212842998U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a dust removal system for smelting high-temperature coal gas, which comprises a furnace, a water-cooling flue, a cyclone gravity dust collector and a main filter which are connected in sequence through pipelines, wherein the bottoms of the cyclone gravity dust collector and the main filter are connected with an ash tank through pipelines, and the other side of the main filter is connected with an air cooler, a high-temperature coal gas special fan, a water-cooling heat exchanger and a gas holder in sequence through pipelines; the pipeline between the water-cooling flue and the cyclone gravity dust collector is provided with front-end diffusing equipment, a gas analysis detector is installed between the water-cooling flue and the front-end diffusing equipment, the pipeline between the water-cooling heat exchanger and the gas cabinet is provided with rear-end diffusing equipment, and the gas analysis detector is arranged between the water-cooling heat exchanger and the rear-end diffusing equipment. The utility model relates to a smelt high temperature coal gas dust pelletizing system has solved the problem that the high temperature coal gas cooling dust pelletizing system process route that exists is complicated among the prior art, the processing flow sets up unreasonable, operating stability is poor.
Description
Technical Field
The utility model belongs to the technical field of high temperature dusty gas purifies, concretely relates to smelt high temperature coal gas dust pelletizing system.
Background
High-temperature gas coming out of the furnace top during smelting contains a large amount of dust, and the dust can be reflowed and bonded to block a heat exchange device during high-temperature combustion, so that the heat efficiency is reduced, and even equipment is damaged, so that the high-temperature gas can enter subsequent pipelines and equipment after being cooled and dedusted. With the continuous innovation and development of the high-temperature coal gas cooling and dedusting technology, the dedusting and purifying technology is developed from the original wet dedusting into the dry dedusting.
The smoke and dust generated during dry dedusting is large in amount, high in ash content, high in gas temperature and strong in corrosivity, and the conventional high-temperature gas cooling dedusting system has the problems of complex process route and unreasonable treatment flow setting, so that the whole system is short in service life and poor in operation stability. In addition, the operation conditions are harsh, so that the performance requirement on a high-temperature filter bag which is a core component of a dust removal process is very high. Therefore, the development of a mature and stable high-temperature gas treatment system is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a smelt high temperature coal gas dust pelletizing system has solved the problem that the high temperature coal gas cooling dust pelletizing system process route that exists is complicated among the prior art, the processing procedure sets up unreasonable, operating stability is poor.
The technical scheme adopted by the utility model is a dust removal system for smelting high-temperature coal gas, which comprises a furnace, a water-cooling flue, a cyclone gravity dust collector and a main filter which are connected in sequence through pipelines, wherein the bottom parts of the cyclone gravity dust collector and the main filter are connected with an ash tank through pipelines, and the other side of the main filter is connected with an air cooler, a high-temperature coal gas special fan, a water-cooling heat exchanger and a gas cabinet in sequence through pipelines;
the pipeline between the water-cooling flue and the cyclone gravity dust collector is provided with front-end diffusing equipment, a gas analysis detector is installed between the water-cooling flue and the front-end diffusing equipment, the pipeline between the water-cooling heat exchanger and the gas cabinet is provided with rear-end diffusing equipment, and the gas analysis detector is arranged between the water-cooling heat exchanger and the rear-end diffusing equipment.
The utility model discloses a characteristics still lie in:
the top of the main filter is sequentially connected with a back flush air bag, a nitrogen heater and a nitrogen storage tank through pipelines, and a back flush control valve is arranged on the pipeline between the back flush air bag and the main filter.
The nitrogen heater is respectively connected with the top of the ash tank, the cyclone gravity dust collector and the main filter through a pipeline and a three-way valve, and a replacement pipeline valve is arranged on the pipeline.
The cyclone gravity dust collector and the pipeline of the main filter connected with the ash tank are respectively provided with a double-layer air locking valve, and the bottom of the ash tank is provided with a double-layer air locking valve.
The main filter body is connected with the ash tank body through a side branch pipeline, and a balance pipeline valve is arranged on the side branch pipeline.
The main filter comprises a metal high-temperature bag type dust collector or a ceramic high-temperature bag type dust collector.
The front end diffusing equipment and the rear end diffusing equipment are both chimneys with torches.
The utility model has the advantages that:
the utility model relates to a dust removal system for smelting high-temperature coal gas, which has reasonable design, and the positions and the model selection of all parts are strictly controlled, thereby ensuring the stability of the system to the maximum extent; the utility model relates to a dust removal system for smelting high-temperature coal gas, which avoids the mixing of high-temperature coal gas and air by means of gas replacement during starting and stopping, and improves the safety of the system by ensuring the sealing performance of the intersection between each part in the system and the outside; the utility model relates to a dust removal system for smelting high-temperature coal gas, which is designed with two-stage cooling and dust removal procedures, wherein pre-cooling dust removal equipment (a water-cooling flue and a cyclone gravity dust remover) buffers the working pressure of main cooling and dust removal equipment (a main filter, an air cooler and a water-cooling heat exchanger), thereby ensuring the sufficiency of cooling and dust removal and being beneficial to the stable operation of the main cooling and dust removal equipment; the utility model relates to a smelt high temperature coal gas dust pelletizing system, its simple structure who lets out grey equipment (ash can), convenient operation lets out the double-deck air-lock valve of grey equipment moreover and can ensure that outside air and system are isolated, has further ensured the security of system.
Drawings
FIG. 1 is a schematic structural view of a dust removing system for smelting high-temperature gas.
In the figure, 1, a furnace, 2, a water-cooling flue, 3, a cyclone gravity dust collector, 4, a main filter, 5, an ash tank, 6, a nitrogen storage tank, 7, a nitrogen heater, 8, a back flushing air bag, 9, an air cooler, 10, a high-temperature gas special fan, 11, a water-cooling heat exchanger, 12, a gas cabinet, 13, front-end diffusion equipment, 14, rear-end diffusion equipment, 15, a balance pipeline valve, 16, a double-layer air locking valve, 17, a back flushing control valve and 18 are pipeline replacement valves.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to a dust removal system for smelting high-temperature coal gas, the structure is shown in figure 1, and the dust removal system comprises a furnace 1, a water-cooling flue 2, a cyclone gravity dust collector 3 and a main filter 4 which are connected in sequence through pipelines, the bottoms of the cyclone gravity dust collector 3 and the main filter 4 are connected with an ash tank 5 through pipelines, and the other side of the main filter 4 is connected with an air cooler 9, a high-temperature coal gas special fan 10, a water-cooling heat exchanger 11 and a gas holder 12 through pipelines in sequence;
a front end diffusing device 13 is arranged on a pipeline between the water cooling flue 2 and the cyclone gravity dust collector 3, a gas analysis detector is arranged between the water cooling flue 2 and the front end diffusing device 13, a rear end diffusing device 14 is arranged on a pipeline between the water cooling heat exchanger 11 and the gas chamber 12, and a gas analysis detector is arranged between the water cooling heat exchanger 11 and the rear end diffusing device 14.
Wherein, the special fan 10 for high-temperature coal gas is a special explosion-proof fan for coal gas medium, and the gas analysis detector can detect the content of hydrogen, carbon monoxide and oxygen in the high-temperature coal gas.
Preferably, the top of the main filter 4 is connected with a backwash air bag 8, a nitrogen heater 7 and a nitrogen storage tank 6 in sequence through pipelines, and a backwash control valve 17 is arranged on the pipeline between the backwash air bag 8 and the main filter 4. The back-flushing control valve 17 is a pulse back-flushing valve. The nitrogen heater 7 can ensure that the nitrogen entering the back flushing air bag 8 is heated hot nitrogen, thereby avoiding the performance of the main filter 4 from being influenced by back flushing condensation caused by using low-temperature nitrogen. The hot nitrogen is required to be respectively connected into each main device for replacement during start-up and shutdown.
Preferably, the nitrogen heater 7 is connected to the top of the ash tank 5, the cyclone gravity dust collector 3 and the main filter 4 through pipes and a three-way valve, respectively, and the pipes are provided with a replacement line valve 18. The hot nitrogen passing through the nitrogen heater 7 needs to be respectively connected into the ash tank 5, the cyclone gravity dust collector 3 and the main filter 4 for replacement during start-up and shutdown.
Preferably, the cyclone gravity dust collector 3 and the main filter 4 are respectively provided with a double-layer air-lock valve 16 on the pipeline connected with the ash tank 5, and the bottom of the ash tank 5 is provided with a double-layer air-lock valve 16. The cyclone gravity dust collector 3 can preliminarily collect large particle dust in coal gas.
Preferably, the main filter 4 body is connected to the ash tank 5 body by a bypass conduit, on which a balance line valve 15 is provided. The balance pipeline valve 15 is used for balancing the internal gas pressure of the cyclone gravity dust collector 3 and the lower ash tank 5 when the cyclone gravity dust collector and the main filter 4 discharge ash, so that the ash discharge condition is met. The balance line valve 15 and the replacement line valve 18 are identical in structure.
Preferably, the main filter 4 comprises a metal high temperature bag house or a ceramic high temperature bag house.
Preferably, the front end diffusing device 13 and the rear end diffusing device 14 are each a chimney with a flare. Because the coal gas discharged from the chimney directly releases toxic gas, the coal gas can be converted into non-toxic gas only by ignition and combustion,
the utility model relates to a smelt high temperature coal gas dust pelletizing system, the theory of operation as follows:
when the dust removal system for smelting high-temperature coal gas is used, the main filter 4 is installed according to actual needs; the high temperature dusty gas exiting the furnace 1 has a relatively high ash content, up to 300g/Nm3The water-cooling flue 2 can cool the high-temperature dust-containing coal gas to below 450 ℃, that is, the water-cooling flue 2 carries out pre-cooling treatment on the high-temperature dust-containing coal gas from the furnace 1 to reduce the treatment pressure of the main filter 4, meanwhile, the gas analysis detector detects the coal gas after the pre-cooling treatment, if the coal gas components meet the requirements (the oxygen content in the high-temperature coal gas is not more than 2%), the coal gas enters the cyclone gravity dust collector 3 for pre-dedusting treatment, otherwise, the coal gas is diffused through the front-end diffusing equipment 13; the gas after the pre-dedusting treatment is further cooled and dedusted through the main filter 4, the air cooler 9 and the water-cooled heat exchanger 11, so that the high-temperature dust-containing gas becomes low-temperature clean gas, the main filter 4 can directly filter the gas at the high temperature of 450 ℃, and the high-temperature clean gas is cooled to below 60 ℃ from 450 ℃; meanwhile, the gas analysis detector detects the low-temperature clean coal gas after the temperature reduction and dust removal treatment, if the components of the coal gas meet the requirements, the coal gas enters the coal gas cabinet 12 for storage, and otherwise, the coal gas is diffused through the rear-end diffusing equipment 14;
the main filter 4 accumulates a large amount of dust in the process of filtering high-temperature dust-containing gas, and needs to be cleaned regularly, namely, regular dust discharge is completed through the dust tank 5, specifically, when certain dust is accumulated in the cyclone gravity dust collector 3 and the main filter 4, the balance pipeline valve 15 needs to be started, so that the gas pressure in the cyclone gravity dust collector 3, the main filter 4 and the dust tank 5 reaches a balance state, then the double-layer air locking valve 16 of the cyclone gravity dust collector 3 and the main filter 4 is opened, the accumulated dust is discharged into the dust tank 5 along the pipeline, and after the dust tank 5 is fully accumulated with the accumulated dust, the double-layer air locking valve 16 at the lower end of the dust tank 5 is opened, and the dust accumulated in the dust tank 5 is discharged; in addition, after the main filter 4 operates for a period of time, dust adheres to the surface of a filter bag inside the main filter 4, so that the filtering effect is affected, and at the moment, the main filter 4 needs to be subjected to online back flushing by a back flushing air bag 8, a nitrogen heater 7 and a nitrogen storage tank 6, so that the filtering activity of the main filter 4 is recovered; specifically, the nitrogen is preheated by a nitrogen heater 7 and then reaches above the dew point temperature, the preheated backwashing nitrogen enters a backwashing gas bag 8 for storage, accumulated dust with a certain thickness is accumulated on the surface of a filter bag in a main filter 4, and when the filtering efficiency is influenced, a backwashing control valve 17 is opened, and the backwashing nitrogen can remove the accumulated dust on the surface layer of the filter bag; the back flushing nitrogen gas from the back flushing gas bag 8 can be divided into a plurality of groups according to the requirement, and the specific grouping mode is determined by the diameter of the main filter 4 and the arrangement mode of the filter bags in the main filter.
The replacement system provides gas replacement assurance to the system when the furnace 1 is started and stopped. The specific replacement process is as follows: when the furnace is opened, the replacement gas inlet and outlet of the cyclone gravity dust collector 3, the main filter 4, the ash tank 5 and other equipment are opened, and after residual air in the pipeline connected among the equipment and the equipment is replaced by nitrogen, the replacement gas inlet and outlet is closed and the residual air can be sent to a gas inlet system; when the furnace is stopped, after the nitrogen replacement of the furnace opening is finished, the compressed air replacement needs to be finished by the same method, and the start of the maintenance work is allowed.
The temperature of the coal gas is reduced by the temperature reduction of the air cooler 9, so that the temperature resistance requirement on the special high-temperature coal gas fan 10 is lowered, and the special high-temperature coal gas fan 10 is arranged in front of the water-cooling heat exchanger 11 to prevent the coal gas from being cooled to be below the dew point of tar and coking on blades of the special high-temperature coal gas fan to influence the stable operation of the special high-temperature coal gas fan; the special high-temperature coal gas fan 10 is interlocked with the furnace pressure, and when the furnace pressure fluctuates, the special high-temperature coal gas fan 10 can automatically adjust the power to match with the furnace pressure, so that the overall requirement of the system is met.
Claims (7)
1. A dust removal system for smelting high-temperature coal gas is characterized by comprising a furnace (1), a water-cooling flue (2), a cyclone gravity dust collector (3) and a main filter (4) which are sequentially connected through pipelines, wherein the bottoms of the cyclone gravity dust collector (3) and the main filter (4) are respectively connected with an ash tank (5) through pipelines, and the other side of the main filter (4) is sequentially connected with an air cooler (9), a high-temperature coal gas special fan (10), a water-cooling heat exchanger (11) and a coal gas cabinet (12) through pipelines;
be provided with front end equipment of diffusing (13) on the pipeline between water-cooling flue (2) and whirlwind gravity dust collector (3), install gaseous analysis detector between water-cooling flue (2) and front end equipment of diffusing (13), be provided with rear end equipment of diffusing (14) on the pipeline between water-cooling heat exchanger (11) and gas chamber (12), be provided with gaseous analysis detector between water-cooling heat exchanger (11) and rear end equipment of diffusing (14).
2. The dust removal system for smelting high-temperature gas as claimed in claim 1, wherein the top of the main filter (4) is sequentially connected with a backwash gas bag (8), a nitrogen heater (7) and a nitrogen storage tank (6) through pipelines, and a backwash control valve (17) is arranged on the pipeline between the backwash gas bag (8) and the main filter (4).
3. The dust removal system for high-temperature smelting gas as claimed in claim 2, wherein the nitrogen heater (7) is respectively connected with the top of the ash tank (5), the top of the cyclone gravity dust collector (3) and the top of the main filter (4) through a pipeline and a three-way valve, and a replacement pipeline valve (18) is arranged on the pipeline.
4. The dust removal system for high-temperature smelting gas as claimed in claim 1, wherein the cyclone gravity dust collector (3) and the main filter (4) are respectively provided with a double-layer air locking valve (16) on a pipeline connected with the ash tank (5), and the bottom of the ash tank (5) is provided with the double-layer air locking valve (16).
5. The dust removal system for high-temperature smelting gas as claimed in claim 1, wherein the main filter (4) body is connected with the ash tank (5) body through a bypass pipeline, and a balance pipeline valve (15) is arranged on the bypass pipeline.
6. A dust removal system for metallurgical hot gas according to claim 1, wherein the main filter (4) comprises a metal high temperature bag filter or a ceramic high temperature bag filter.
7. The dust removal system for high-temperature smelting gas as claimed in claim 1, wherein the front end diffusing device (13) and the rear end diffusing device (14) are chimneys with torches.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021739153.5U CN212842998U (en) | 2020-08-19 | 2020-08-19 | Dust removal system for smelting high-temperature coal gas |
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| CN202021739153.5U CN212842998U (en) | 2020-08-19 | 2020-08-19 | Dust removal system for smelting high-temperature coal gas |
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| CN212842998U true CN212842998U (en) | 2021-03-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114058773A (en) * | 2021-11-04 | 2022-02-18 | 江苏天洁环境工程有限公司 | Efficient purifying and dedusting system and method for converter gas |
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- 2020-08-19 CN CN202021739153.5U patent/CN212842998U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114058773A (en) * | 2021-11-04 | 2022-02-18 | 江苏天洁环境工程有限公司 | Efficient purifying and dedusting system and method for converter gas |
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