CN213866287U - Blast furnace charging bucket pressure-equalizing coal gas full-recovery system - Google Patents
Blast furnace charging bucket pressure-equalizing coal gas full-recovery system Download PDFInfo
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- CN213866287U CN213866287U CN202022523776.5U CN202022523776U CN213866287U CN 213866287 U CN213866287 U CN 213866287U CN 202022523776 U CN202022523776 U CN 202022523776U CN 213866287 U CN213866287 U CN 213866287U
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Abstract
The utility model provides a blast furnace charging bucket voltage-sharing coal gas full recovery system belongs to coal gas purification and retrieves technical field. The system comprises a blast furnace charge tank, a primary pressure equalizing pipeline and valve, a secondary pressure equalizing pipeline and valve, a natural diffusing pipeline and dust removing and gas recycling pipeline and valve, a nitrogen safety protecting pipeline and valve, a gas recycling pipeline, a vacuum tank and a vacuum pump. The blast furnace charging bucket is connected with the inlet of the cyclone dust collector through a pipeline, and the outlet of the cyclone dust collector is respectively connected with the primary pressure equalizing pipeline, the natural bleeding pipeline and the coal gas recovery pipeline. The coal gas recovery pipeline is provided with a coal gas recovery dust remover, the bottom of the coal gas dust remover is provided with an ash discharge valve, and the outlet of the coal gas dust remover is connected with a vacuum tank and a vacuum pump. The system can achieve 100% of full recovery of the pressure-equalizing coal gas, and achieve the purposes of no pollution discharge and cyclic utilization of the coal gas.
Description
Technical Field
The utility model relates to a coal gas purification retrieves technical field, especially indicates a complete recovery system of blast furnace charging bucket voltage-sharing coal gas.
Background
In the normal production process of a blast furnace of an iron and steel enterprise, raw fuel such as ore, coke and the like is continuously filled into a charging bucket at the top of the furnace, and then the raw fuel is intermittently filled into the furnace through a charging device at the top of the furnace for reduction smelting process, so that qualified molten iron is obtained. The top charging equipment periodically performs the actions of opening an upper sealing valve, receiving materials, closing the upper sealing valve, equalizing pressure, opening a lower sealing valve, distributing materials, closing the lower sealing valve, releasing the gas in the charging bucket and the like. In the discharging process of the charging bucket, dirty coal gas in the blast furnace can enter the charging bucket, so that the dust content of pressure-equalizing coal gas in the charging bucket is increased, and the environment pollution is directly diffused.
At present, most enterprises do not carry out recovery operation on the pressure-equalizing gas, but simply purify the gas and discharge the gas to the air. The pressure-equalizing coal gas in the charging tank and part of dirty coal gas in the blast furnace are mixed and then directly discharged into the atmosphere through the cyclone dust collector and the silencer, thus causing pollution to the environment. Because the cyclone dust collector can only remove a part of dust with larger-diameter particles in the coal gas, the rest dust is directly discharged into the atmosphere along with the diffused coal gas, and the blast furnace gas contains a large amount of CO and a small amount of H2、CH4And the like, which causes serious pollution to the atmospheric environment, particularly to the production area of the blast furnace, and wastes the part of coal gas energy at the same time.
The single blast furnace diffuses about 300 times per day by the charging bucket, and the charging bucket at the top of the blast furnace diffuses about 15 times per hour, namely, diffuses about 360 times per day. The yield of molten iron in 2018 years in China is 7.71 million tons (9.28 million crude steel), and the quantity of the molten iron is 6Nm according to the quantity of coal gas released by each ton of iron3The annual average pressure coal gas emission amount is about 46 billion cubic meters, so much coal gas is discharged into the atmosphere, the pollution is serious, a large amount of energy is wasted, and the economic loss of the unrecovered average pressure coal gas is as high as 4.6 billion RMB (the unit price of blast furnace gas is 0.10 yuan/Nm)3Calculation). Although the charging bucket pressure equalizing coal gas is released intermittently and periodically, the reasonable recovery of the part of energy has important significance.
The technology for recovering the blast furnace charge tank pressure-equalizing gas at home and abroad has low recovery efficiency, large interference to a gas official network, and no large amount of popularization of implemented semi-recovery and injection full-recovery modes. The semi-recovery mode is to send the dirty gas of the blast furnace in the charging bucket to a clean gas pipe network through a recovery dust remover and a valve, the recovery amount of the gas is about 50-65%, and the method is a more form at present. The injection full recovery mode is characterized in that an injector is added on a recovery pipeline to inject the residual coal gas in the charging bucket into a recovery pipe network, so that the quantity of the recovered coal gas is increased, but the pressure impact on the pipe network in the recovery process is large, the efficiency of the injector is low, and the recovery time is long. The ventilation type charging bucket pressure-equalizing coal gas full-recovery mode is poor in safety, poor in sealing performance, small in draught fan suction force and long in recovery time, cannot meet the process requirement of charging bucket coal gas recovery, and enterprises cannot recognize the mode completely.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a complete recovery system of blast furnace charge tank voltage-sharing coal gas for the voltage-sharing coal gas of whole recovery furnace roof material jar avoids half recovery mode to discharge material jar voltage-sharing coal gas to the sky and draws and penetrate the full recovery mode and strike big, the shortcoming of inefficiency to the gas official website, realizes that material jar voltage-sharing coal gas is whole to be retrieved, reduces pollution and the energy waste to the air, retrieves the coal gas dust.
The system comprises a blast furnace charge tank, a primary pressure equalizing pipeline and valve, a secondary pressure equalizing pipeline and valve, a natural diffusing pipeline and dust removing, gas recycling pipeline and valve, a nitrogen safety protecting pipeline and valve, a gas recycling pipeline, a vacuum tank and a vacuum pump; the blast furnace charging tank is connected with an inlet of a cyclone dust collector through a pipeline, an outlet of the cyclone dust collector is respectively connected with a primary pressure equalizing pipeline, a natural bleeding pipeline and a gas recovery pipeline, the gas recovery dust collector is arranged on the gas recovery pipeline, an ash discharging valve is arranged at the bottom of the gas dust collector, and an outlet of the gas dust collector is connected with a vacuum tank and a vacuum pump.
Wherein, set up dust recovery liquid dynamic valve on the pipeline between blast furnace material jar and the cyclone, insert secondary pressure-equalizing pipeline on the pipeline between blast furnace material jar and the dust recovery liquid dynamic valve, secondary pressure-equalizing pipeline end-to-end connection secondary pressure-equalizing nitrogen gas jar sets up secondary pressure-equalizing valve on the secondary pressure-equalizing pipeline.
The end of the primary pressure equalizing pipeline is connected with a primary gas pressure equalizing main pipe, and a primary pressure equalizing electric blind plate valve A, a primary pressure equalizing hydraulic valve and a primary pressure equalizing electric blind plate valve B are sequentially arranged on the pipeline between the cyclone dust collector and the primary gas pressure equalizing main pipe.
A natural diffusion electric blind plate valve is arranged on the natural diffusion pipeline close to the cyclone dust collector, and a natural diffusion liquid-operated valve and a natural diffusion silencer are sequentially arranged behind the natural diffusion electric blind plate valve.
A gas recovery manual valve A, a gas recovery hydraulic valve B and a gas recovery manual valve B are sequentially arranged on a gas recovery pipeline close to a cyclone dust collector, the pipeline behind the gas recovery manual valve B is divided into two paths, one path of pipeline is provided with a safety diffusion manual valve and a safety diffusion hydraulic valve, the other path of pipeline is provided with a gas recovery electric valve A and a gas recovery electric blind plate valve A, the pipeline behind the gas recovery electric blind plate valve A is connected with the gas recovery dust collector, the pipeline behind the gas recovery dust collector is divided into two paths, one path of pipeline is provided with a gas recovery electric blind plate valve B, a gas recovery electric valve B and a gas recovery check valve, the other path of pipeline is provided with a vacuum manual valve A and a vacuum electric valve A, the pipeline behind the vacuum electric valve A is connected into a vacuum tank, and the pipeline behind the vacuum tank is provided with a vacuum manual valve C and a vacuum electric valve B, and a vacuum pump is connected to a pipeline behind the vacuum electric valve B, a vacuum check valve A and a vacuum manual valve B are arranged on the pipeline behind the vacuum pump, and the pipeline behind the vacuum manual valve B is converged with the pipeline behind the gas recovery check valve and is connected to a clean gas pipe network.
The vacuum electric valve B, the vacuum pump, the vacuum check valve A and the vacuum manual valve B are arranged into two groups, and the two groups of pipelines provided with the vacuum electric valve B, the vacuum pump, the vacuum check valve A and the vacuum manual valve B are connected between the vacuum manual valve C and the clean gas official net in parallel.
Two groups of vacuum electric valves B, vacuum pumps, vacuum check valves A and vacuum manual valves B are used for one standby.
The vacuum degree value of the vacuum pump is set to-300 KPa to 500KPa according to the volume of the charging bucket.
The ash discharging valve comprises an ash discharging electric valve and an ash discharging manual valve, and the ash discharging manual valve and the ash discharging electric valve are sequentially arranged at the lower part of the coal gas recovery dust remover.
The inlet and outlet of the coal gas recovery dust remover can be connected with nitrogen, and the coal gas recovery dust remover is used when pipelines and valves are overhauled.
The gas pressure of the primary pressure-equalizing gas main pipe is 180-210 kPa, and the pressure of the net gas pipe network is 8-10 kPa.
The corrugated pipe is allowed to be installed at the inlet and outlet positions of the gas recovery dust remover, so that the installation positions of the on-site pipeline and the recovery dust remover are convenient to arrange.
The blast furnace tank outlet allows the installation of bellows for pipe radial and axial position compensation.
The bottom of the gas recovery dust remover allows installation of an ash discharge device or an ash conveying system.
The vacuum tank allows the two tank bodies to be alternately operated, and the vacuum pump is prevented from being started and stopped frequently.
The blast furnace charging bucket is provided with a pressure detection point; the inlet and outlet pipelines of the coal gas recovery dust remover are respectively provided with temperature and pressure detection points.
The utility model discloses an above-mentioned technical scheme's beneficial effect as follows:
1. the gas recovery process has no ejector equipment, high-pressure gas is not required to be externally connected, the pressure of a clean gas pipe network is not impacted, the charging bucket pressure-sharing gas can be recovered by 100 percent, and the direct discharge of the pressure-sharing gas and the pollution to the atmosphere are avoided. Environmental pollution and resource waste, and meets the requirements of energy conservation, emission reduction and environmental protection.
2. The dust content of the coal gas recovered by the charging bucket is low and is less than or equal to 5mg/Nm3The recovered gas can directly enter a gas pipe network or be used for one-time pressure equalization of the charging bucket.
3. The charging process time is not occupied in the charging bucket coal gas full recovery process, the charging time sequence of the blast furnace is not influenced, and additional coal gas resources are not consumed.
4. The invention has the advantages of flexible overall structure arrangement, low modification cost, full-automatic operation, stable reliability, no gas discharge, zero environmental pollution, energy conservation and environmental protection.
Drawings
FIG. 1 is a schematic structural view of a single vacuum pump of a blast furnace charge tank pressure-equalizing gas full recovery system of the present invention;
FIG. 2 is the schematic structural diagram of the double vacuum pump of the blast furnace charge tank pressure-equalizing gas full recovery system of the present invention.
Wherein: 1-blast furnace charging bucket; 2-secondary pressure equalizing valve; 3-secondary pressure equalizing nitrogen tank; 4-dust recovery liquid valve; 5-cyclone dust collector; 6-primary voltage-sharing electric blind plate valve A; 7-a primary pressure-equalizing hydraulic valve; 8-a primary voltage-sharing electric blind plate valve B; 9-primary gas pressure equalizing main pipe; 10-naturally diffusing the electric blind plate valve; 11-natural bleeding hydraulic valves; 12-natural diffusing silencer; 13-gas recovery hand valve A; 14-gas recovery hydraulic valve; 15-gas recovery manual valve B; 16-safety bleeding manual valve; 17-safe bleeding hydraulic valves; 18-gas recovery electric valve A; 19-gas recovery electric blind plate valve A; 20-a gas recovery dust remover; 21-gas recovery electric blind plate valve B; 22-gas recovery electric valve B; 23-gas recovery check valve; 24-clean gas pipe network; 25-ash discharge electric valve; 26-ash unloading manual valve; 27-vacuum manual valve a; 28-vacuum motorised valve A; 29-vacuum tank; 30-vacuum electric valve B; 31-a vacuum pump; 32-vacuum check valve a; 33-vacuum manual valve B; 34-vacuum manual valve C; 30' -vacuum motorised valve BI; 31' -vacuum pump I; 32' -vacuum check valve AI; 33' -vacuum Manual valve BI.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The utility model provides a blast furnace charging bucket voltage-sharing coal gas full recovery system.
As shown in fig. 1, the system comprises a blast furnace material tank 1, a primary pressure equalizing pipeline and valve, a secondary pressure equalizing pipeline and valve, a natural diffusing pipeline and dust removing and gas recycling pipeline and valve, a nitrogen safety protecting pipeline and valve, a gas recycling pipeline, a vacuum tank 29 and a vacuum pump 31; the blast furnace charging bucket 1 is connected with an inlet of a cyclone dust collector 5 through a pipeline, an outlet of the cyclone dust collector 5 is respectively connected with a primary pressure equalizing pipeline, a natural bleeding pipeline and a gas recovery pipeline, a gas recovery dust collector 20 is arranged on the gas recovery pipeline, an ash discharging valve is arranged at the bottom of the gas dust collector 20, and an outlet of the gas dust collector 20 is connected with a vacuum tank 29 and a vacuum pump 31.
Wherein, set up dust recovery hydraulic valve 4 on the pipeline between blast furnace material jar 1 and the cyclone 5, insert secondary pressure-equalizing pipeline on the pipeline between blast furnace material jar 1 and the dust recovery hydraulic valve 4, secondary pressure-equalizing pipeline end-to-end connection secondary pressure-equalizing nitrogen gas jar 3 sets up secondary pressure-equalizing valve 2 on the secondary pressure-equalizing pipeline.
The tail end of the primary pressure equalizing pipeline is connected with a primary gas pressure equalizing header pipe 9, and a primary pressure equalizing electric blind valve A6, a primary pressure equalizing hydraulic valve 7 and a primary pressure equalizing electric blind valve B8 are sequentially arranged on the pipeline between the cyclone dust collector 5 and the primary gas pressure equalizing header pipe 9.
A natural diffusion electric blind plate valve 10 is arranged on the natural diffusion pipeline close to the cyclone dust collector 5, and a natural diffusion hydraulic valve 11 and a natural diffusion silencer 12 are sequentially arranged behind the natural diffusion electric blind plate valve 10.
A coal gas recovery manual valve A13, a coal gas recovery hydraulic valve 14 and a coal gas recovery manual valve B15 are sequentially arranged on a coal gas recovery pipeline close to the cyclone dust collector 5, the pipeline behind the coal gas recovery manual valve B15 is divided into two paths, a safety diffusion manual valve 16 and a safety diffusion hydraulic valve 17 are arranged on one path of pipeline, a coal gas recovery electric valve A18 and a coal gas recovery electric blind plate valve A19 are arranged on the other path of pipeline, the pipeline behind the coal gas recovery electric blind plate valve A19 is connected with the coal gas recovery dust collector 20, the pipeline behind the coal gas recovery dust collector 20 is divided into two paths, a coal gas recovery electric blind plate valve B21, a coal gas recovery electric valve B22 and a coal gas recovery check valve 23 are arranged on one path of pipeline, a vacuum manual valve A27 and a vacuum electric valve A28 are arranged on the other path of pipeline, the pipeline behind the vacuum electric valve A28 is connected to a vacuum tank 29, a vacuum electric valve C34 and a vacuum electric valve B30 are arranged on the pipeline behind the vacuum manual valve 29, the vacuum pump 31 is connected to the pipeline behind the vacuum electric valve B30, the vacuum check valve A32 and the vacuum manual valve B33 are arranged on the pipeline behind the vacuum pump 31, the pipeline behind the vacuum manual valve B33 is merged with the pipeline behind the gas recovery check valve 23, and the clean gas official network 24 is connected.
As shown in fig. 2, the vacuum electric valve B30, the vacuum pump 31, the vacuum check valve a32 and the vacuum manual valve B33 may be provided in two sets, and the pipes for providing the vacuum electric valve B30, the vacuum pump 31, the vacuum check valve a32 and the vacuum manual valve B33 and the pipes for providing the vacuum electric valve BI30 ', the vacuum pump I31', the vacuum check valve AI32 'and the vacuum manual valve BI 33' are connected in parallel between the vacuum manual valve C34 and the clean gas official net 24.
Two sets of vacuum electric valve B30, vacuum pump 31, vacuum check valve A32 and vacuum manual valve B33 are used one by one.
The vacuum degree value of the vacuum pump is set to-300 KPa to 500KPa according to the volume of the charging bucket.
The ash discharging valve comprises an ash discharging electric valve 25 and an ash discharging manual valve 26, and the ash discharging manual valve 26 and the ash discharging electric valve 25 are sequentially arranged at the lower part of the coal gas recovery dust remover 20.
The primary pressure equalizing pipeline and the valve are used for balancing the gas pressure in the material tank and the gas pressure in the blast furnace; the secondary pressure equalizing nitrogen tank and the secondary pressure equalizing valve are used for increasing the pressure of the pressure equalizing gas; the system can fully recover the pressure-equalizing coal gas of the charging bucket, can also control and switch to a mode of semi-recovering the pressure-equalizing coal gas and naturally diffusing the pressure-equalizing coal gas, and is provided with a safe diffusing pipeline and a valve in the recovery system.
The process flow for fully recovering the blast furnace charge tank pressure-equalizing coal gas comprises the following steps:
the method comprises the following steps: and (4) performing a semi-recovery process. The recovery valve of the charging bucket is opened, the crude gas in the charging bucket is subjected to coarse dust removal through a cyclone dust collector, the semi-clean gas after dust removal enters the gas recovery dust collector through a three-way interface, an electric valve and a gas blind plate valve, the filtered gas passes through a three-way 1 st outlet and the electric valve arranged on the pipeline 1, the gas blind plate valve and a check valve enter a clean gas pipe network, the gas pressure of the charging bucket reaches a set value of 30 KPa-50 KPa, the recovery process is stopped, a natural bleeding valve is opened, and the residual gas in the charging bucket is discharged into the atmosphere. The dust filtered by the coal gas recovery dust remover is deposited at the bottom of the dust remover and is recovered through manual and electric dust discharge valves.
Step two: and (4) carrying out a whole recovery process. After the semi-recovery process of the pressure-equalizing coal gas of the charging bucket is finished, the pressure of the charging bucket is reduced to 30 KPa-50 KPa, and a full recovery mode is started. Under the semi-recovery mode, an electric valve at the outlet of the gas dust collector is closed, two valves at the inlet of the vacuum tank are opened, the gas filtered by the gas dust collector is subjected to diameter change through a No. 2 outlet of the tee joint, the gas is connected with two ball valves and enters the vacuum tank, the vacuum tank pumps the pressure in the vacuum tank into-200 KPa to-500 KPa through a vacuum pump, pressure difference is generated between the blast furnace material tank and the vacuum tank, and the residual gas with the pressure of 30KPa to 50KPa in the material tank can enter the vacuum tank, so that 100 percent of gas in the recovery material tank is recovered.
Two or three tank bodies can be arranged according to the on-site process requirement and are used alternately, so that the start-stop impact of the vacuum pump is reduced, and the gas pressure in the full recovery process is free from interference.
Step three: and (5) naturally diffusing. The gas in the charging bucket is directly discharged into the atmosphere without being recovered. That is, the gas after dust removal by the cyclone dust collector directly passes through the electric blind plate valve, the hydraulic valve and the silencer and is discharged into the atmosphere.
The system can flexibly realize three working modes: 1. a natural diffusion mode; 2. a semi-recovery mode; 3. and (4) a full recovery mode.
The charging bucket pressure-equalizing natural gas emission mode is a working mode adopted when the blast furnace is in an abnormal condition or is overhauled and shut down. The method is different from the existing blast furnace charging bucket pressure-equalizing gas non-recovery mode, and the natural bleeding mode requires that three valves, namely a gas recovery hydraulic valve 14, a safety bleeding hydraulic valve 17 and a gas recovery electric valve A18, on a gas recovery pipeline must be closed. When the pressure-equalizing gas in the charging bucket is naturally diffused, the natural diffusion electric blind plate valve 10 is normally opened, the natural diffusion hydraulic valve 11 is opened, the gas recovery hydraulic valve 14 is closed, the safety diffusion hydraulic valve 17 is closed, the gas recovery electric valve A18 is closed, the pressure-equalizing gas is discharged into the atmosphere through the natural diffusion silencer 12, the natural diffusion hydraulic valve 11 is closed after the diffusion is finished, and the natural diffusion process is finished.
In the natural diffusion process, the primary pressure-equalizing electric blind plate valve A6 is opened, the primary pressure-equalizing hydraulic valve 7 is closed, and the primary pressure-equalizing electric blind plate valve B8 is normally opened.
The semi-recovery mode of the charging bucket pressure-equalizing gas is characterized in that a natural bleeding hydraulic valve 11 is closed, a gas recovery manual valve A13 is normally opened, a gas recovery hydraulic valve 14 is opened, a gas recovery manual valve B15 is normally opened, a safety bleeding manual valve 16 is normally opened, a safety bleeding hydraulic valve 17 is closed, a gas recovery electric valve A18 is opened, a gas recovery electric blind plate valve A19 is normally opened, and pressure-equalizing gas in a charging bucket enters a gas recovery dust remover 20 for fine dust particle dust removal. The dust removed by the charging bucket is collected at the bottom of the coal gas recovery dust remover 20, and is collected for secondary utilization through a normally open manual ash discharging valve 26 and an electric ash discharging valve 25. The coal gas purified by the coal gas recovery dust remover 20 sequentially enters a coal gas recovery electric blind valve B21, a coal gas recovery electric valve B22 and a coal gas recovery check valve 23 and then is connected to a clean coal gas official net 24. And finishing the semi-recovery process of the pressure-equalizing coal gas of the charging bucket.
In the semi-recovery process of the pressure-equalizing gas, the primary pressure-equalizing electric blind plate valve A6 is opened, the primary pressure-equalizing hydraulic valve 7 is closed, and the primary pressure-equalizing electric blind plate valve B8 is normally opened.
In the semi-recovery process, the gas pressure in the blast furnace charging bucket 1 is 200KPa to 250KPa, and the gas pressure of the clean gas pipe network 24 is 10KPa, because of the pressure difference, the pressure-equalizing gas can flow from the blast furnace charging bucket 1 to the clean gas pipe network 24.
The charging bucket pressure equalizing gas full recovery mode is established on the basis of a half recovery mode, the vacuum degree in a vacuum tank is set to be-300 KPa to-500 KPa according to the volume of a charging bucket, when pressure equalizing gas flows from a blast furnace charging bucket 1 to a net gas pipe network 24 direction, and when the pressure value of the charging bucket is reduced to a set value of 50KPa, a vacuum manual valve A27 is normally opened, a vacuum electric valve A28 is opened, a gas recovery electric valve B22 is closed, and residual gas which is not recovered in the half recovery mode enters the vacuum tank 29 under the pushing of pressure, and the residual pressure equalizing gas is completely recovered in the vacuum tank 29. The main function of the vacuum pump 31 is to reduce the pressure in the vacuum tank 29 to-300 KPa to-500 KPa, and form a pressure difference with the pressure in the charging bucket 1, so as to ensure that the residual gas in the blast furnace charging bucket 1 can flow to the clean gas pipe network.
The vacuum degree forming step of the vacuum tank 29 is to close the vacuum electric valve A28, close the normally open vacuum manual valve D34, close the vacuum electric valve C35, open the vacuum electric valve B30, open the normally open vacuum manual ball valve C33, start the vacuum pump 31 to work, the vacuum degree in the vacuum tank 29 reaches the set value, the vacuum pump 31 stops working, close the vacuum electric valve B30, and finish the process of forming the vacuum degree in the vacuum tank 29.
When the full recovery mode is started, the pressure-equalizing coal gas with the pressure of 50KPa in the blast furnace charging bucket 1 sequentially passes through a coal gas recovery manual valve A13, a coal gas recovery hydraulic valve 14, a coal gas recovery manual valve B15, a coal gas recovery electric valve A18, a coal gas recovery electric blind plate valve A19, a coal gas recovery dust remover 20, a vacuum manual valve A27 and a vacuum electric valve A28 to enter a vacuum tank 29. At this time, the vacuum pump 29 is turned off 28, and the vacuum degree of the vacuum tank 29 is completed, that is, the pressure-equalized coal gas in the vacuum tank 29 is discharged into the clean coal gas pipe network 24, so that the process of completely recovering the pressure-equalized coal gas is completed.
In the process of full recovery of the pressure-equalizing gas, the safety diffusion manual valve 16 is normally opened, and the safety diffusion hydraulic valve 17 is closed; a primary pressure equalizing hydraulic valve 6 on the primary pressure equalizing pipeline is closed; the natural bleeding hydraulic valve 11 on the natural bleeding pipeline is closed.
And after the charging of the blast furnace charging bucket is finished, carrying out primary pressure-equalizing operation. And (3) opening a hydraulic valve 7 on the primary pressure equalizing pipeline, wherein the primary pressure equalizing electric blind plate valve A6 is normally opened, and the primary pressure equalizing electric blind plate valve B8 is normally opened. Semi-clean gas in the primary gas pressure equalizing main pipe 9 enters the charging tank through the cyclone dust collector 5 and the dust recovery hydraulic valve 4, and pressure balance between the blast furnace charge tank 1 and the interior of the blast furnace is kept. If the primary pressure equalizing can not satisfy the balance with the pressure in the blast furnace, the secondary pressure equalizing valve 2 is opened, and the high-pressure nitrogen in the secondary pressure equalizing nitrogen tank 3 enters the blast furnace charging bucket 1, so that the pressure balance between the blast furnace charging bucket 1 and the pressure in the blast furnace is ensured. The pressure in the blast furnace is generally maintained between 180KPa and 250KPa according to the operation requirement.
According to the invention, for the geometric volume of different types of blast furnace charging buckets 1, the vacuum process of the full recovery mode can adopt a mode of arranging two vacuum tanks. Namely, a set of vacuum pipeline is added. Comprises a vacuum electric valve BI30 ', a vacuum pump I31', a vacuum check valve AI32 'and a vacuum manual valve BI 33'. The working mode that the vacuum pump is used and prepared is realized. The specific implementation mode is shown in figure 2.
When the full recovery mode breaks down or is overhauled, the system can be switched to a semi-recovery working mode or a natural diffusion working mode through PLC automatic control. The complementarity of various working modes and the flexibility of a control system are realized, and the time sequence of the blast furnace charging pressure equalizing process is completely unaffected.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The utility model provides a complete recovery system of blast furnace charge jar voltage-sharing coal gas which characterized in that: comprises a blast furnace charging bucket (1), a primary pressure equalizing pipeline and valve, a secondary pressure equalizing pipeline and valve, a natural diffusing pipeline and dust removing, gas recycling pipeline and valve, a nitrogen safety protecting pipeline and valve, a gas recycling pipeline, a vacuum tank (29) and a vacuum pump (31); the blast furnace charging bucket (1) is connected with an inlet of a cyclone dust collector (5) through a pipeline, an outlet of the cyclone dust collector (5) is respectively connected with a primary pressure equalizing pipeline, a natural bleeding pipeline and a gas recovery pipeline, a gas recovery dust collector (20) is arranged on the gas recovery pipeline, an ash discharge valve is arranged at the bottom of the gas dust collector (20), and an outlet of the gas dust collector (20) is connected with a vacuum tank (29) and a vacuum pump (31).
2. The blast furnace charge tank pressure equalizing gas full recovery system according to claim 1, characterized in that: set up dust on the pipeline between blast furnace material jar (1) and cyclone (5) and retrieve hydraulic valve (4), insert secondary pressure-equalizing pipeline on the pipeline between blast furnace material jar (1) and dust recovery hydraulic valve (4), secondary pressure-equalizing pipeline end-to-end connection secondary pressure-equalizing nitrogen gas jar (3), set up secondary pressure-equalizing valve (2) on the secondary pressure-equalizing pipeline.
3. The blast furnace charge tank pressure equalizing gas full recovery system according to claim 1, characterized in that: the tail end of the primary pressure equalizing pipeline is connected with a primary gas pressure equalizing main pipe (9), and a primary pressure equalizing electric blind plate valve A (6), a primary pressure equalizing hydraulic valve (7) and a primary pressure equalizing electric blind plate valve B (8) are sequentially arranged on the pipeline between the cyclone dust collector (5) and the primary gas pressure equalizing main pipe (9).
4. The blast furnace charge tank pressure equalizing gas full recovery system according to claim 1, characterized in that: a natural diffusion electric blind plate valve (10) is arranged on the natural diffusion pipeline close to the cyclone dust collector (5), and a natural diffusion hydraulic valve (11) and a natural diffusion silencer (12) are sequentially arranged behind the natural diffusion electric blind plate valve (10).
5. The blast furnace charge tank pressure equalizing gas full recovery system according to claim 1, characterized in that: a gas recovery manual valve A (13), a gas recovery hydraulic valve (14) and a gas recovery manual valve B (15) are sequentially arranged on the gas recovery pipeline close to the cyclone dust collector (5), the pipeline behind the gas recovery manual valve B (15) is divided into two paths, a safe diffusion manual valve (16) and a safe diffusion hydraulic valve (17) are arranged on one path of pipeline, a gas recovery electric valve A (18) and a gas recovery electric blind plate valve A (19) are arranged on the other path of pipeline, the pipeline behind the gas recovery electric blind plate valve A (19) is connected with the gas recovery dust collector (20), the pipeline behind the gas recovery dust collector (20) is divided into two paths, a gas recovery electric blind plate valve B (21), a gas recovery electric valve B (22) and a gas recovery check valve (23) are arranged on one path of pipeline, a vacuum manual valve A (27) and a vacuum electric valve A (28) are arranged on the other path of pipeline, the pipeline behind the vacuum electric valve A (28) is connected into a vacuum tank (29), the pipeline behind the vacuum tank (29) is provided with a vacuum manual valve C (34) and a vacuum electric valve B (30), the pipeline behind the vacuum electric valve B (30) is connected with a vacuum pump (31), the pipeline behind the vacuum pump (31) is provided with a vacuum check valve A (32) and a vacuum manual valve B (33), and the pipeline behind the vacuum manual valve B (33) is converged with the pipeline behind the gas recovery check valve (23) and is connected into a clean gas official network (24).
6. The blast furnace charge tank pressure equalizing gas full recovery system according to claim 5, characterized in that: the vacuum electric valve B (30), the vacuum pump (31), the vacuum check valve A (32) and the vacuum manual valve B (33) are arranged into two groups, and the pipelines of the two groups of the vacuum electric valve B (30), the vacuum pump (31), the vacuum check valve A (32) and the vacuum manual valve B (33) are connected between the vacuum manual valve C (34) and the clean gas official network (24) in parallel.
7. The blast furnace charge tank pressure equalizing gas full recovery system according to claim 6, characterized in that: the two groups of vacuum electric valves B (30), the vacuum pump (31), the vacuum check valve A (32) and the vacuum manual valve B (33) are used for standby.
8. The blast furnace charge tank pressure equalizing gas full recovery system according to claim 6, characterized in that: the vacuum degree value of the vacuum pump is set to-300 KPa to 500KPa according to the volume of the charging bucket.
9. The blast furnace charge tank pressure equalizing gas full recovery system according to claim 1, characterized in that: the ash discharging valve comprises an ash discharging electric valve (25) and an ash discharging manual valve (26), and the ash discharging manual valve (26) and the ash discharging electric valve (25) are sequentially arranged at the lower part of the coal gas recovery deduster (20).
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| CN202022523776.5U CN213866287U (en) | 2020-11-03 | 2020-11-03 | Blast furnace charging bucket pressure-equalizing coal gas full-recovery system |
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| CN202022523776.5U CN213866287U (en) | 2020-11-03 | 2020-11-03 | Blast furnace charging bucket pressure-equalizing coal gas full-recovery system |
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| CN202022523776.5U Active CN213866287U (en) | 2020-11-03 | 2020-11-03 | Blast furnace charging bucket pressure-equalizing coal gas full-recovery system |
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