Rapid treatment method for excessive particle concentration of dust remover in dry quenching environment

Abstract

The invention discloses a quick treatment method for particulate matter concentration exceeding of a dust remover in a dry quenching environment, which comprises the following steps: 1) when the particulate matter concentration exceeds the standard, immediately stopping coke discharge of a dry quenching furnace, and notifying coking to stop coke loading; 2) isolating a diffusing device and a coke discharging device of the dry quenching furnace body from an environment dust remover; (3) after confirming that the steps are completed, stopping the operation of the dust removal fan; 4) informing a flue gas desulfurization post of stopping spraying the desulfurizing agent; 5) arranging the on-duty post personnel to wait at the air cylinder of the dust remover off-line valve; and (6) closing off-line valves of partial bins of the dust remover in sequence, and isolating partial dust removal bins from the flue gas. By adopting the method, when the particulate matter concentration of the environmental dust remover continuously exceeds the standard, the dust removal bin with the problem can be quickly checked and treated or isolated, normal production of dry quenching is recovered as soon as possible on the basis of meeting the environmental protection requirement, and the operation of a dry quenching device is prevented from being greatly influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of dry coke quenching environmental protection, and particularly to a rapid treatment method for excessive particulate matter concentration in the dry coke quenching environmental dust collector. Background Art

[0002] The dry coke quenching device is a process device that uses an inert gas mainly composed of nitrogen as an intermediate medium to recover the sensible heat of the red coke in the coke oven. When charging coke in the dry coke quenching device, due to the replacement of the gas in the furnace by the red coke, a large amount of gas containing coke dust will escape from the furnace mouth of the dry coke quenching furnace; due to the positive pressure of the circulating gas, the non - absolute airtightness of the coke discharging device and the discharge of coke at the feeding point of the coke discharging device, a large amount of dust - containing gas will also be generated; in addition, to balance the pressure distribution of the dry coke quenching circulating gas system, the main body of the dry coke quenching furnace will continuously discharge part of the dust - containing gas through the pressure regulating and discharging pipe of the pre - storage chamber. These dust - containing gases must be treated by the dry coke quenching environmental dust collector and meet the environmental protection standards before being discharged into the atmosphere. The particulate matter concentration of the flue gas discharged by the dry coke quenching environmental dust collector is a major environmental protection index, which reflects the concentration of dust carried in the flue gas. The dry coke quenching environmental dust collector adopts a long - bag low - pressure pulse jet type bag filter. During the operation of the environmental dust collector, due to the falling off, sagging of the filter bags or the existence of leakage points on the bin wall, sometimes the particulate matter concentration of the flue gas continuously exceeds the standard. It is necessary to quickly check the dust removal bin where the problem occurs, treat or isolate it to ensure that the particulate matter concentration meets the standard and eliminate the impact on the dry coke quenching production. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a rapid treatment method for excessive particulate matter concentration in the dry coke quenching environmental dust collector.

[0004] To solve the above - mentioned technical problem, the technical solution adopted by the present invention includes the following steps: 1) When it is found that the particulate matter concentration exceeds the standard, immediately stop the coke discharging of the dry coke quenching furnace and notify the coking to stop charging coke; 2) Isolate the discharging device of the dry coke quenching furnace body and the coke discharging device from the environmental dust collector; 3) After confirming that the above steps are completed, stop the operation of the dust removal fan; 4) Notify the flue gas desulfurization post to stop injecting the desulfurizing agent; 5) Arrange the on - duty post personnel to standby at the air cylinder of the off - line valve of the dust collector; 6) Close the off - line valves of some bins of the dust collector in sequence to isolate some dust removal bins from the flue gas; 7) After the dust removal fan stops running for a period of time, restart the dust removal fan and notify the flue gas desulfurization post to resume injecting the desulfurizing agent; 8) Observe the change of the particulate matter concentration after starting the dust removal fan, and check out the dust removal bin with problems through whether the particulate matter concentration is qualified; 9) Open the cover of the dust removal bin where problems are identified during troubleshooting. If the filter bags are found to be detached or sagging, replace them; after replacing the filter bags, open the offline valve of this bin and observe the change in particulate matter concentration; if the indicators are normal, resume the normal operation of this bin; if the indicators are abnormal, or no detachment or sagging of the filter bags is found, still close the offline valve of this dust removal bin, isolate this dust removal bin, and continue to use step 8) to troubleshoot other dust removal bins until all existing problems are found.

[0005] Further, in step 8), observe the change in particulate matter concentration after starting the dust removal fan; if the particulate matter concentration is qualified, determine which bin specifically has problems by sequentially opening the offline valves of some closed bins; if the particulate matter concentration still exceeds the standard, open the offline valves of some closed bins, then sequentially close the offline valves of adjacent bins, and then observe the change in particulate matter concentration until the dust removal bin with problems is found. Further, when no fault point can be found after the restarted dust removal fan has run for a period of time, repeat steps 2) - 9).

[0006] Even further, when no fault point can be found after the restarted dust removal fan has run for 20 - 30 minutes, repeat steps 2) - 9).

[0007] Further, in step 7), after the dust removal fan has stopped running for 20 - 30 minutes, restart the dust removal fan.

[0008] The beneficial effects of adopting the above technical solution are as follows: When the particulate matter concentration in the environmental dust collector of the present invention continuously exceeds the standard, it can quickly identify the dust removal bin with problems, process or isolate it, and on the basis of meeting environmental protection requirements, quickly resume the normal production of the coke dry quenching as soon as possible, avoiding a greater impact on the operation of the coke dry quenching device. The method of the present invention can achieve the rapid treatment of the particulate matter concentration exceeding the standard in the environmental dust collector of the coke dry quenching. The treatment process has a short impact time on the normal production of the coke dry quenching. The time for stopping the charging and discharging of the coke dry quenching furnace is only 0.5 - 1.5 hours, and it will not cause a greater impact on the operation of the coke dry quenching device. At the same time, it can ensure that the particulate matter concentration meets the standard during the treatment period. Description of the Drawings

[0009] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0010] Figure 1 is the structural schematic diagram of the bag filter of the present invention; Figure 2 is the structural schematic diagram of the environmental dust removal system of the coke dry quenching of the present invention.

[0011] In the figure: 1 - offline valve; 2 - pulse valve; 3 - pressure stabilizing air bag; 4 - injection pipe; 5 - filter bag. DETAILED DESCRIPTION

[0012] Figure 1 , Figure 2 As shown, the structure of the CDQ environmental dust collector is as follows: a plurality of dust removal bins are provided in the outer shell of the dust collector, and filter bags 5 are provided in each of the dust removal bins. The upper part of the dust removal bin is the upper box of the dust removal bin. An offline valve 1, a pulse valve 2, a pressure-stabilizing air bag 3 and a blow pipe 4 are provided in the upper box; the opening and closing of the offline valve 1 can connect or cut off the dust removal bin to which it belongs with the outlet air duct of the dust collector; the pulse valve 2 connects the air bag and the blow pipe 4, and the blow pipe is connected to the inside of each filter bag 5 through a branch, and the pulse valve is opened to allow the blow gas (compressed air) to enter the bag 5 from the air bag through the blow pipe 4, thereby playing a role in cleaning.

[0013] Example: Figure 2 As shown, the rapid treatment method for excessive particle concentration in the CDQ environment dust collector adopts the following steps.

[0014] 1) When it is found that the particulate matter concentration in the CDQ environmental dust removal station continues to exceed the standard, the CDQ furnace coking should be stopped immediately and the coking plant should be notified to stop loading coke. If loading coke is in progress, it is prohibited to carry out loading coke even if there is red coke on the carrier vehicle after loading coke is completed.

[0015] 2) Close the flat gate of the coke discharge device and the manual baffle of the dust cover of the pre-storage chamber pressure regulating vent pipe.

[0016] 3) After confirming that the CDQ furnace is loaded and de-coke is completed, stop the dust removal fan.

[0017] 4) Notify the flue gas desulfurization station to stop spraying desulfurizer into the environmental dust removal system.

[0018] 5) Arrange the on-duty personnel to stand by at the dust collector offline valve.

[0019] 6) Close the offline valves of ambient dust collector bins 1 to 3 in sequence.

[0020] 7) After the dust removal fan stops running for 20 to 30 minutes, restart the dust removal fan and notify the flue gas desulfurization station to resume spraying the desulfurizer.

[0021] 8) Observe the change of particle concentration after starting the fan; If the particle concentration is qualified, open the offline valves of the closed warehouses 1 to 3 in turn, observe the changes in the particle concentration, and determine which warehouse among warehouses 1 to 3 has a problem.

[0022] If the particulate matter concentration still exceeds the standard, open the offline valves of bins 1 to 3 that have been closed, then sequentially close the offline valves of adjacent bins 4 to 6, and then observe the change in particulate matter concentration to determine whether there is a problem with the dust removal bin among bins 4 to 6. If the particulate matter concentration continues to exceed the standard, open the offline valves of bins 4 to 6 that have been closed, and then sequentially close the offline valves of the remaining dust removal bins (bin... number, bin n - 1, bin n) until the dust removal bin with problems is identified.

[0023] 9) Remove the cover of the dust removal bin with problems identified for inspection. If it is found that the filter bags have fallen off or sagged, replace them. After replacement, cover the bin cover, open the offline valve of this bin, and observe the change in particulate matter concentration; if the particulate matter concentration is normal, resume the normal operation of this bin; If the particulate matter concentration is abnormal, or no filter bag falling off or sagging is found, continue to close the offline valve of this bin to isolate this bin and wait for the opportunity to repair to check and deal with whether there are leakage points on the bin wall of this bin.

[0024] 10) When no fault point can be identified after the dust removal fan has run for 20 - 30 minutes, repeat steps 2) - 9).

Claims

1. A rapid treatment method for excessive particle concentration in a dust collector in a dry coke quenching environment, characterized in that: The steps include: 1) when it is found that the concentration of particulate matter exceeds the standard, immediately stop the dry quenching furnace to discharge coke, and notify the coking plant to stop loading coke; 2) Isolate the CDQ furnace body venting device, coke discharge device and environmental dust collector; 3) After confirming that the above steps are completed, stop the dust removal fan; 4) Notify the flue gas desulfurization station to stop spraying desulfurizer; 5) Arrange the personnel on duty to stand by at the air cylinder of the dust collector offline valve (1); 6) Close the offline valves of some bins of the dust collector in sequence to isolate some bins from the flue gas; 7) After the dust removal fan stops running for a period of time, restart the dust removal fan and notify the flue gas desulfurization station to resume spraying desulfurizer; 8) After starting the dust removal fan, observe the change in particle concentration and identify the dust removal bin with problems by checking whether the particle concentration is qualified; 9) Open the lid of the dust removal bin that has been found to have problems for inspection. If the bag is found to have fallen off or dropped, replace it. After replacing the bag, open the offline valve of the bin and observe the change in particle concentration. If the indicators are normal, restore the normal operation of the bin. If the indicators are abnormal, or the bag is not found to have fallen off or dropped, close the offline valve of the bin, isolate the bin, and continue to use step 8) to check other bins until all existing problems are found.

2. A method for rapidly treating excessive particle concentration in a dust collector in a dry coke quenching environment according to claim 1, characterized in that: In the step 8, after starting the dust removal fan, observe the change in particle concentration; if the particle concentration is qualified, determine which bin has the problem by opening the offline valves of some of the closed bins in sequence; if the particle concentration still exceeds the standard, open the offline valves of some of the closed bins, and then close the offline valves of some of the adjacent bins in sequence, and then observe the change in particle concentration until the dust removal bin with the problem is found.

3. The method for rapidly treating excessive particle concentration in a dust collector in a dry coke quenching environment according to claim 1, characterized in that: If the restarted dust removal fan cannot be found after running for a period of time, repeat steps 2) to 9).

4. A method for rapidly treating excessive particle concentration in a dust collector in a dry coke quenching environment according to claim 3, characterized in that: If the restarted dust removal fan cannot be found after running for 20 to 30 minutes, repeat steps 2) to 9).

5. A method for rapidly treating excessive particle concentration in a dust collector in a dry coke quenching environment according to claim 1, 2 or 3, characterized in that: In the step 7), the dust removal fan is restarted after the dust removal fan stops running for 20 to 30 minutes.

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