CN107723011B - Method for online water cutting of hole-pulling of negative pressure gas system - Google Patents
Method for online water cutting of hole-pulling of negative pressure gas system Download PDFInfo
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- CN107723011B CN107723011B CN201711114109.8A CN201711114109A CN107723011B CN 107723011 B CN107723011 B CN 107723011B CN 201711114109 A CN201711114109 A CN 201711114109A CN 107723011 B CN107723011 B CN 107723011B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000005520 cutting process Methods 0.000 title claims abstract description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000007789 gas Substances 0.000 claims abstract description 70
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 43
- 238000004140 cleaning Methods 0.000 claims abstract description 23
- 239000003034 coal gas Substances 0.000 claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims description 12
- 239000012716 precipitator Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 7
- 239000010425 asbestos Substances 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 229910052895 riebeckite Inorganic materials 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000010304 firing Methods 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 abstract description 3
- 238000004939 coking Methods 0.000 description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 4
- CWRYPZZKDGJXCA-UHFFFAOYSA-N acenaphthene Chemical compound C1=CC(CC2)=C3C2=CC=CC3=C1 CWRYPZZKDGJXCA-UHFFFAOYSA-N 0.000 description 4
- 239000000571 coke Substances 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000002262 irrigation Effects 0.000 description 3
- 238000003973 irrigation Methods 0.000 description 3
- HXGDTGSAIMULJN-UHFFFAOYSA-N acetnaphthylene Natural products C1=CC(C=C2)=C3C2=CC=CC3=C1 HXGDTGSAIMULJN-UHFFFAOYSA-N 0.000 description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 2
- 235000011130 ammonium sulphate Nutrition 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011027 product recovery Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/04—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials
- C10K1/046—Reducing the tar content
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G13/00—Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Separating Particles In Gases By Inertia (AREA)
- Industrial Gases (AREA)
Abstract
The invention relates to a method for online water cutting hole pulling of a negative pressure gas system, which is characterized in that a primary cooler is cleaned, the resistance of a single primary cooler is not more than 0.9kPa, one path of nitrogen cleaning is carried out from the outlet of the primary cooler to be processed, the other path of nitrogen cleaning is carried out from the discharge pipe of a traffic pipe, and nitrogen directly enters a gas main pipe network; performing a third path of nitrogen cleaning from the fault valve of the primary cooler to be processed to the body of the primary cooler to be processed; hole-pulling operation is carried out in the fire-proof grate, short sections are welded on the original gas pipeline at the position of the simulated hole-pulling position respectively, gate valves are installed on the short sections, and the hole-pulling machine for water cutting is operated to cut and pull out iron plates in the intersecting area of the outer wall of the original pipeline and the short sections. The advantages are that: the accident that the weight falls off of the outlet valve can be safely handled, in order to avoid igniting coal gas in the pipeline in the process of firing, protective nitrogen is introduced into key positions of the primary cooler body and the auxiliary pipeline in the whole hole-pulling process, positive pressure is kept in the hole-pulling pipeline and the device, and external air is difficult to enter.
Description
Technical Field
The invention relates to a method for online water cutting of a hole in a plate in a negative pressure gas system.
Background
The primary cooler is a device for cooling coke oven gas in the first chemical recovery operation area and removing easily blocked fractions such as tar, naphthalene, acenaphthene and the like in the raw coke oven gas, and plays a vital role in the blast cooling process. The gas collecting temperature after the primary cooler is also called as the collecting temperature, and has important influence on the subsequent procedures.
A recovery operation area adopts the design of 5 parallel horizontal pipe type primary coolers, coke oven gas enters the primary coolers from the top, circulating water and low-temperature water are respectively fed by the upper section tube bundle and the lower section tube bundle of the primary coolers, and the coal gas passes through the shell layer from top to bottom. And (3) spraying condensate on the upper section and the lower section of the primary cooler during the running period, wherein the condensate automatically flows to the upper section and the lower section of the gas water seal tank under the action of gravity, and then enters the upper section and the lower section of the condensate tank, and the condensate is circularly sprayed by a pump. The power source for conveying the gas is 2 running electric blowers, wherein the gas pipeline in front of the blower is under negative pressure of-3.0 KPa, the gas pipeline behind the blower is under positive pressure of-15 kPa, and the suction force in front of the primary cooler is kept between 1.2kPa and 1.5 kPa. The coke oven gas passes through the primary cooler and the electric tar precipitator in sequence and then is sent to the next procedure by the blower.
In the year 2016 (8 months), the 5# primary cooler outlet valve is broken (namely, a mechanical device in the valve fails to open the valve again), and is limited by the process environment, namely a continuous negative pressure gas system and the special position of the broken valve, the 1# to 5# primary cooler inlet is provided with an independent control valve, but a single primary cooler gas outlet pipeline is connected to an outlet main pipeline, and the primary cooler gas outlet main pipeline is not provided with the control valve, so that the production can not be stopped and replaced. The main harm of four primary coolers operation lies in: a, the resistance of a single primary cooler is increased, and the cleaning frequency is increased so as to increase the corrosion to the inner tube bundle. b, the load of the blower is increased, the elastic space for adjusting the suction force in front of the primary cooler is reduced, and coking and bleeding can be caused. And c, the flowing time of the coal gas in the primary cooler is increased, the spraying effect of the condensate is weakened, and the naphthalene, acenaphthene and other fractions in the coal gas block devices and pipelines.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for online water cutting of the hole wrenching of the negative pressure gas system, which can quickly and effectively solve the problem of valve failure and avoid the diffusion of coking. The primary cooler can be put into operation again, the original operation state is recovered by cooling, the gas resistance of the primary cooler system and the electric tar precipitator system is reduced, and various key process parameters such as temperature are stably integrated. The loss of coal gas and three products is reduced.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for online water cutting of hole wrenching of a negative pressure gas system comprises the following steps:
1) cleaning the primary coolers, wherein the resistance of a single primary cooler is not more than 0.9kPa, the method is used for maintaining the operation and the yield of the rest primary coolers in a short period of time, and nitrogen cleaning is performed from the outlet of the primary cooler to be treated at a gas flow of 40-80m3The nitrogen directly enters a coal gas main pipe network, and the other path of nitrogen cleaning is carried out at the position of a traffic pipe diffusing pipe, wherein the gas amount is 40-80m3The nitrogen directly enters a coal gas main pipe network; performing a third nitrogen cleaning path from the fault valve of the primary cooler to be processed to the body of the primary cooler to be processed, wherein the air flow is 40-80m3H, diffusing nitrogen from a diffusing pipe at the top of the primary cooler;
2) the electric tar precipitator is powered off, so that the hidden danger caused by air entering is avoided;
3) a blind plate is blocked between the lower-section condensate liquid tank and the hot oil washing square tank, and the irrigation volume of the hot oil washing square tank is not less than 4/5 of a solvent of the hot oil washing tank; closing a valve of an observation hole of the lower segment of the gas water seal tank, and introducing nitrogen into the lower segment of the gas water seal tank and the lower segment of the condensate tank;
4) measuring the thickness of the gas pipeline at the position of the hole to be punched by using a thickness measuring instrument, and ensuring that the average wall thickness of the pipe wall at the position of the hole to be punched is not less than 6 mm;
5) building a fire-proof grate at the position of the pull hole, performing hole pulling operation in the fire-proof grate, respectively welding short sections on the original gas pipeline at the position of the simulated pull hole, installing a gate valve, cutting and pulling out an iron plate in the intersecting area of the outer wall of the original pipeline and the short sections by a water cutting hole pulling machine, and installing a reducing pipeline to be connected to a primary cooler gas outlet header pipe; the two hole pulling points are respectively positioned in front of a valve of a gas outlet pipeline of the primary cooler to be treated and at a main pipeline of the gas outlet pipeline of the primary cooler to be treated.
The fire-proof grate is a closed structure consisting of a blind plate or asbestos.
The nitrogen is sent to the desulfurization process by the blower along with the coal gas.
Compared with the prior art, the invention has the beneficial effects that:
the method can safely process the accident of weight falling of the outlet valve, and in order to avoid igniting coal gas in the pipeline in the process of firing, protective medium nitrogen is introduced into key positions of the primary cooler body and the accessory pipeline in the whole hole-pulling process, so that positive pressure is kept in the hole-pulling pipeline and the device, and external air is difficult to enter. The fire-proof grate can close all paths which can splash sparks, fundamentally cut off two points of three elements of combustion, namely combustion-supporting substances and a fire source, and further ensure the safe operation.
The primary cooler to be treated can be put into operation again, the original operation state is recovered by cooling, the gas resistance of the primary cooler system and the electric tar precipitator system is reduced, and various key process parameters such as the temperature are stably integrated. The problem of valve failure is solved quickly and effectively, the adjusting elastic space of the air blower is enlarged, and coking is prevented from being diffused. The loss of coal gas and three products is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic view of the gas flow direction of the present invention.
FIG. 3 is a schematic view of hole-pulling operation.
In the figure: 1-5# primary cooler 2-spanner hole 3-hot oil washing square groove 4-lower segment gas water seal groove 5-upper segment gas water seal groove 6-lower segment condensate groove 7-upper segment condensate groove 8-blower water seal groove 9-blower 10-electric tar precipitator 11-short section 12-valve.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings, but it should be noted that the present invention is not limited to the following embodiments.
A method for online water cutting of hole wrenching of a negative pressure gas system comprises the following steps:
1) cleaning the primary coolers, wherein the resistance of a single primary cooler is not more than 0.9kPa, the method is used for maintaining the operation and the yield of the rest primary coolers in a short period of time, and nitrogen cleaning is performed from the outlet of the primary cooler to be treated at a gas flow of 40-80m3The nitrogen directly enters a coal gas main pipe network, and the other path of nitrogen cleaning is carried out at the position of a traffic pipe diffusing pipe, wherein the gas amount is 40-80m3The nitrogen directly enters a coal gas main pipe network; performing a third nitrogen cleaning path from the fault valve of the primary cooler to be processed to the body of the primary cooler to be processed, wherein the air flow is 40-80m3H, diffusing nitrogen from a diffusing pipe at the top of the primary cooler;
2) the electric tar precipitator is powered off, so that the hidden danger caused by air entering is avoided;
3) a blind plate is blocked between the lower-section condensate liquid tank and the hot oil washing square tank, and the irrigation volume of the hot oil washing square tank is not less than 4/5 of a solvent of the hot oil washing tank; closing a valve of an observation hole of the lower segment of the gas water seal tank, and introducing nitrogen into the lower segment of the gas water seal tank and the lower segment of the condensate tank;
4) measuring the thickness of the gas pipeline at the position of the hole to be punched by using a thickness measuring instrument, and ensuring that the average wall thickness of the pipe wall at the position of the hole to be punched is not less than 6 mm;
5) building a fire-proof grate at the position of the pull hole, performing hole pulling operation in the fire-proof grate, respectively welding short sections on the original gas pipeline at the position of the simulated pull hole, installing a gate valve, cutting and pulling out an iron plate in the intersecting area of the outer wall of the original pipeline and the short sections by a water cutting hole pulling machine, and installing a reducing pipeline to be connected to a primary cooler gas outlet header pipe; the two hole pulling points are respectively positioned in front of a valve of a gas outlet pipeline of the primary cooler to be treated and at a main pipeline of the gas outlet pipeline of the primary cooler to be treated.
Wherein, the fire prevention grate is the enclosed construction that blind plate or asbestos are constituteed. The nitrogen is sent to the desulfurization process by the blower with the coal gas.
Examples
Referring to fig. 1-3, 5 parallel "horizontal pipe type" primary coolers are adopted in the existing recovery operation area, after the weight of the outlet valve of the 5# primary cooler falls, a bypass needs to be opened so as not to influence normal production, the whole system is a negative pressure gas system, holes need to be pulled by online water cutting, and the specific operation comprises the following steps:
1) preparation measures before hole pulling:
◇ 1# to 4# primary coolers execute a temporary cleaning system for cleaning 1 primary cooler every 2 days, if the resistance of a single primary cooler is detected to be more than 0.9kPa, the system for cleaning 1 primary cooler every 1 day is executed, the system is used for maintaining the operation and production preservation of the other 4 primary coolers in a short time, nitrogen cleaning is performed from the outlet of the 5# primary cooler, the nominal diameter of a pipeline is DN50, the air volume is 50m3The nitrogen directly enters a coal gas main pipe network; performing nitrogen cleaning on the other path from the discharge pipe of the traffic pipe, wherein the nominal diameter of the pipeline is DN25, and the air flow is 50m3The nitrogen directly enters a coal gas main pipe network; a third nitrogen cleaning is carried out from the front of a 5# primary cooler fault valve to the front of a 5# primary cooler body, the nominal diameter of a pipeline is DN50, and the air volume is 50m3H, diffusing nitrogen from a diffusing pipe at the top of the primary cooler;
and closing the gas inlet and outlet valve of the 5# primary cooler. And (5) closing the circulating water and low-temperature water inlet and outlet valves of the No. 5 primary cooler. The top of the No. 5 primary cooler is opened to diffuse the pipe, the nitrogen is introduced into the No. 5 primary cooler body, the 5 No. 5 primary cooler coal gas outlet is introduced into the 5 primary cooler coal gas outlet main pipes, and the primary cooler coal gas outlet large traffic pipe is introduced into the nitrogen, as shown in figure 2.
And 2 blind plates are blocked between the lower section condensate tank and the hot oil washing square tank, and the irrigation liquid level of the hot oil washing square tank is not less than 800 mm. Closing 5 lower segment gas water seal tank observation hole valves, introducing nitrogen into the 5 lower segment gas water seal tanks and the lower segment condensate tank, and keeping micro-positive pressure (pressure value at the head of the point is not actually measured, namely positive pressure is enough).
And (7) utilizing a thickness gauge to measure the thickness of the gas pipeline at the position of the hole to be pulled, and ensuring that the pipe wall at the position of the hole to be pulled is not less than 6 mm.
And manufacturing DN900 and DN1200 nipples and reducing pipelines. DN900 and DN1200 gas pipeline valve blind plugging plates.
Put up the fire prevention grate at the board hole.
2) Hole pulling operation:
the suction before the primary cooler is controlled to be 1.0kPa to 1.1 kPa.
Diamond welding and installing pipelines DN900 multiplied by 10 and 13 m; installing pipelines DN1200 multiplied by 10 and 1.2 m; in addition, a DN80 pipe is welded and punched, and the pipe is arranged at the position marked with 2 at the lower part of the figure 1 and is used for testing the operation condition of the hole punching machine.
And (7) performing hole pulling operation on the water cutting hole pulling machine to cut and extract the outer walls of 2 pipelines, and then installing a valve and a reducing communicating pipe. And (4) performing 1-time analysis on the oxygen content of the coal gas every 2h in the hole pulling process, and stopping hole pulling operation to find reasons when the oxygen content exceeds the standard. During the period, the hole pulling machine is filled with nitrogen, and the pressure is not less than 0.4 MPa. When no negative pressure exists between the hole-pulling valve and the cutter, the water cutter device is detached. And opening 2 newly-installed valves at the spanner holes, stopping the nitrogen, and restarting the 5# primary cooler.
O involved all welding process current control below 100A, striking an arc on a new plate, low current operation. During welding, the welding meat is required to be full, and the defects of slag inclusion, air holes, undercut, overburning and the like are not allowed to occur.
The wrench hole is provided with a support 2, a gas valve support tube 2 and an operating platform 2, so that the online operation is convenient.
In the hole-pulling process, gas is mainly delivered from a third recovery main governor, and the suction force in front of the primary cooler is reduced as much as possible to be stabilized at 1.0 kPa-1.1 kPa on the basis of ensuring that the second coking and the sixth coking are not diffused. The drain of 3 electric blowers was purged 1 time with steam every 2 hours.
The invention has the advantages that:
1. in hole pulling operation, the biggest risk is that coal gas in the pipeline is ignited in the process of firing, protective medium nitrogen is introduced into key positions of the No. 5 primary cooler body and the accessory pipeline in the whole hole pulling process, positive pressure is kept in the hole pulling pipeline and the device, and external air is difficult to enter. The blind plate or asbestos is used to close all the paths which can splash sparks, thus fundamentally cutting off two points of three elements of combustion, namely combustion-supporting substances and fire sources, and further ensuring the safe operation.
2. Electric catching power-off in hole-pulling operation process to prevent O2The dangerous situation that the gas enters the high-voltage electrical equipment occurs, nitrogen in the pipeline before electric capture is sent to the desulfurization process by the blower along with the gas, the next process cannot be influenced, and the safety is further ensured.
3. Comparing important process parameters of a cooling system before and after operation: (see the following Table)
And after hole pulling is finished, the 5# primary cooler is put into operation again, the pressure before the machine, the resistance of the primary cooler, the electric catching resistance and the cleaning frequency of the primary cooler are all effectively reduced, and the normal operation of the cooling process is recovered.
4. The application range is as follows:
the operation method is suitable for being used when the valve at the special position of the negative pressure combustible gas pipeline fails and cannot be replaced on line. The device is particularly suitable for the blowing and condensing process of the chemical product recovery operation area provided with a transverse pipe/vertical pipe primary cooler and an electric tar precipitator.
5. Economic benefits are as follows:
the average gas generation amount of secondary coking and sixth coking is 10 ten thousand meters3① recuperates 42 ten thousand yuan of gas loss according to the calculation result of 4 times of diffusion, the amount of diffusion is 10 percent of the gas generation amount, and the single diffusion time is 8 hours. ② monthly gas generation amount is 7.2 × 107m3The average yield of the crude tar, the light benzene and the ammonium sulfate of the hour 1R is 5900t, 1850t and 1900t, the conversion is ③, the loss of the tar, the ammonium sulfate and the light benzene is 13 ten thousand yuan.
In conclusion, the economic benefit can be created and totaled to 55 ten thousand yuan.
Claims (2)
1. A method for online water cutting hole pulling of a negative pressure gas system is characterized by being suitable for being used when a valve at a special position of a negative pressure combustible gas pipeline fails and cannot be replaced online, and comprising the following steps of:
1) cleaning the primary coolers, wherein the resistance of a single primary cooler is not more than 0.9kPa, the method is used for maintaining the operation and the yield of the rest primary coolers in a short period of time, and nitrogen cleaning is performed from the outlet of the primary cooler to be treated at a gas flow of 40-80m3The nitrogen directly enters a coal gas main pipe network, and the other path of nitrogen cleaning is carried out at the position of a traffic pipe diffusing pipe, wherein the gas amount is 40-80m3The nitrogen directly enters a coal gas main pipe network; performing a third nitrogen cleaning path from the fault valve of the primary cooler to be processed to the body of the primary cooler to be processed, wherein the air flow is 40-80m3H, diffusing nitrogen from a diffusing pipe at the top of the primary cooler;
2) the electric tar precipitator is powered off to avoid hidden danger caused by air entering, and nitrogen in the pipeline before electric precipitation is sent to a desulfurization process by an air blower along with coal gas;
3) a blind plate is blocked between the lower section condensate liquid tank and the hot oil washing square tank, and the water filling volume of the hot oil washing square tank is not less than 4/5 of the volume of the hot oil washing tank; closing a valve of an observation hole of the lower segment of the gas water seal tank, and introducing nitrogen into the lower segment of the gas water seal tank and the lower segment of the condensate tank;
4) measuring the thickness of the gas pipeline at the position of the hole to be punched by using a thickness measuring instrument, and ensuring that the average wall thickness of the pipe wall at the position of the hole to be punched is not less than 6 mm;
5) building a fire-proof grate at the position of the pull hole, performing hole pulling operation in the fire-proof grate, respectively welding short sections on the original gas pipeline at the position of the simulated pull hole, installing gate valves, cutting and pulling out iron plates in the intersecting area of the outer wall of the original pipeline and the short sections by a water cutting hole pulling machine, and installing a reducing pipeline to be connected to a primary cooler gas outlet header pipe; the two hole pulling points are respectively positioned in front of a valve of a gas outlet pipeline of the primary cooler to be treated and at a main pipeline of the gas outlet pipeline of the primary cooler to be treated.
2. The method for on-line water cutting of the spanner hole of the negative pressure gas system according to claim 1, wherein the fire-proof grate is a closed structure composed of a blind plate or asbestos.
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| CN108998103B (en) * | 2018-08-08 | 2020-10-27 | 鞍钢股份有限公司 | Method and device for improving quality of condensate circulating of horizontal pipe primary cooler |
| CN109732176B (en) * | 2019-01-23 | 2024-04-09 | 宣化钢铁集团有限责任公司 | Supporting seat for cutting off and plugging large-diameter gas pipeline and method thereof |
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| 《风险控制与带压封堵及断管技术在新钢焦化厂的应用》;谢立超等;《江西冶金》;20161030;第36卷(第5期);第33页左栏第2段-右栏第2段 * |
| 《高压水在焦炉气配套甲醇装置中的应用》;黄长胜等;《新技术新工艺》;20110531(第05期);第80页左栏第2段-右栏第2段 * |
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|---|---|
| CN107723011A (en) | 2018-02-23 |
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Effective date of registration: 20210826 Address after: 114000 Angang Xiaodongmen, Lishan District, Anshan City, Liaoning Province Patentee after: Anshan Chemical Technology Co.,Ltd. Address before: 114000 No. 1 ring steel road, Tiexi District, Liaoning, Anshan Patentee before: ANGANG STEEL COMPANY LIMITED |