CN109575955B - Automatic maintenance-free coke oven bridge pipe pressure measurement system and method - Google Patents
Automatic maintenance-free coke oven bridge pipe pressure measurement system and method Download PDFInfo
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- CN109575955B CN109575955B CN201811559845.9A CN201811559845A CN109575955B CN 109575955 B CN109575955 B CN 109575955B CN 201811559845 A CN201811559845 A CN 201811559845A CN 109575955 B CN109575955 B CN 109575955B
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- 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
- C10B29/00—Other details of coke ovens
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- 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
- C10B41/00—Safety devices, e.g. signalling or controlling devices for use in the discharge of coke
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Abstract
In order to overcome the defect that a traditional system needs field personnel to perform blowing and maintenance, the invention provides an automatic maintenance-free coke oven bridge pipe pressure measurement system and method, wherein an ascending pipe bridge pipe outlet of a coke oven is divided into two paths through a first tee joint: the purging pipeline is connected with an internal thread ball valve, a circulating ammonia water control electric ball valve and a flow switch in sequence from a purging medium inlet to a first branch interface of the first three-way joint; the pressure measurement pipeline divide the kneck by first three way connection's second and has connected gradually and has got electronic ball valve of pressure control, second three way connection and third three way connection, divide out two tunnel through the third three way connection: one path is connected with a micro differential pressure transmitter, and the other path is connected with a nitrogen blowing system. The method has the advantages of reducing the manual working intensity, shortening the manual maintenance time, improving the operation rate of the whole system, ensuring the continuous measurement of the pressure of the coke oven bridge pipe and providing an effective new way for the pressure measurement of the crude gas of the coke oven bridge pipe.
Description
Technical Field
The invention relates to the technical field of coke oven bridge pipe pressure measurement, in particular to an automatic maintenance-free coke oven bridge pipe pressure measurement system and method.
Background
The stable pressure of the coking chamber of the coke oven is beneficial to ensuring the clean production of the coke oven and the quality of coke. If the pressure of the coking chamber of the coke oven is unstable, the suction force of the gas collecting pipe is insufficient during coal charging, a large amount of raw coke oven gas escapes outwards to seriously pollute the environment, and the raw coke oven gas generated in the coking chamber at the end of coking of the coke oven is reduced, so that the raw coke oven gas in the gas collecting pipe flows back to the coking chamber and is decomposed; and negative pressure appears at the bottom of a coke oven carbonization chamber in the coking end stage, so that the oven wall of the carbonization chamber leaks, a large amount of raw coke oven gas flows into a combustion chamber to be burnt, and the coke oven is adversely affected. Therefore, the pressure detection method has important significance in detecting the crude gas pressure of each carbonization chamber bridge pipe of the coke oven.
The traditional method for measuring the pressure of the bridge pipe of the coke oven is to install a pressure measuring probe on each bridge pipe and then measure the pressure by using a nitrogen blowing method. In the high-temperature dry distillation process of coal, pyrolysis products separated out in a gaseous state are called raw coke oven gas, and the raw coke oven gas contains a large amount of substances such as tar, graphite, naphthalene and the like. According to the field practice experience, because the pressure fluctuation of the bridge pipe is large in the production process, a large amount of tar, graphite and naphthalene can enter the pressure measuring pipeline along with the raw gas, and the pressure measuring pipeline is easy to block, so that the pressure measurement is ineffective. Therefore, the pressure tapping pipeline needs to be cleaned manually at regular intervals, so that manpower and material resources are wasted, the pressure adjustment of a carbonization chamber of the coke oven is influenced, and the normal production of the coke oven is influenced.
Disclosure of Invention
In order to overcome the defect that the traditional system needs field personnel to perform purging and maintenance, the invention provides an automatic maintenance-free coke oven bridge pipe pressure measurement system and a method, wherein the automatic switching of the coke oven bridge pipe pressure measurement and the circulating ammonia water purging is realized by automatically controlling the opening and closing of an electric ball valve through a computer control system; the pressure tapping pipeline blockage condition is judged through the flow switch, and the pipeline blockage alarming function is achieved. The method has the advantages of reducing the manual working intensity, shortening the manual maintenance time, improving the operation rate of the whole system, ensuring the continuous measurement of the pressure of the coke oven bridge pipe and providing an effective new way for the pressure measurement of the crude gas of the coke oven bridge pipe. Provides effective data guarantee for the subsequent pressure regulation of the coking chamber of the coke oven.
In order to achieve the purpose, the invention adopts the following technical scheme:
an automatic maintenance-free coke oven bridge pipe pressure measurement system comprises a pressure tapping connector (1), a micro differential pressure transmitter (2), a nitrogen gas blowing system (3), a plug (4) for maintenance, a first three-way connector (5), a second three-way connector (6), a third three-way connector (7), a pressure tapping control electric ball valve (8), a circulating ammonia water control electric ball valve (9), an internal thread ball valve (10) and a flow switch (11).
The outlet of the ascending pipe bridge of the coke oven is divided into two paths through a first tee joint (5): the device comprises a pressure measuring pipeline and a purging pipeline, wherein the purging pipeline is connected with an internal thread ball valve (10), a circulating ammonia water control electric ball valve (9) and a flow switch (11) in sequence from a purging medium inlet to a first branch interface of a first three-way joint (5); the pressure measurement pipeline divide the kneck by the second of first three way connection (5) to connect gradually and got electronic ball valve of pressure control (8), second three way connection (6) and third three way connection (7), divide out two the tunnel through third three way connection (7): one path is connected with a micro differential pressure transmitter (2), and the other path is connected with a nitrogen blowing system (3).
A measuring method of an automatic maintenance-free coke oven bridge pipe pressure measuring system comprises the following steps:
1) purging with low-pressure circulating ammonia water
The purging medium adopts low-pressure circulating ammonia water: 0.4MPa and 80 ℃;
2) automatic control of bridge pipe pressure measurement and circulating ammonia water purging
The computer control system automatically determines that the system is in a pressure measurement working state or a circulating ammonia water purging state according to the production state of the coke oven; in the coal charging and coke discharging process of the coke oven, at least two times of low-pressure circulating ammonia water purging are realized, and the problem of blockage of a pressure tapping pipeline is effectively solved;
a. coal charging process and coking initial stage after coal charging
In the coal charging process, in order to ensure that no raw gas and smoke overflow, the computer control system automatically and completely opens the bridge pipe water seal valve disc of the carbonization chamber without adjusting according to a pressure measurement value, and the bridge pipe pressure measurement system is automatically switched to a circulating ammonia water purging working state;
in the initial coking stage after coal charging, the generation amount of raw gas is large, the bridge pipe water seal valve disc is required to be completely opened, adjustment is not required according to a pressure measurement value, and the bridge pipe pressure measurement system is automatically switched to a circulating ammonia water purging working state;
b. before, during and after coking
Before, in the middle and later stages of coking, the computer system automatically adjusts the opening of the water seal valve disc in real time according to the measured value of the bridge pipe pressure, so as to keep the pressure in the carbonization chamber stable, and the bridge pipe pressure measuring system is automatically switched to the bridge pipe pressure measuring working state;
c. last stage of coking
In the later stage of coking, in order to prevent the problem that negative pressure appears at the bottom of a coking and carbonization chamber and causes the blowby of the furnace wall of the carbonization chamber, the computer control system automatically closes the bridge pipe water seal valve disc of the carbonization chamber without adjusting according to a pressure measurement value, and the bridge pipe pressure measurement system is automatically switched to a circulating ammonia water purging working state.
3) Automatic switching of bridge pipe pressure measurement and circulating ammonia water purging
Bridge pipe pressure measurement operating condition: the computer control system opens the pressure-taking control electric ball valve (8) and closes the circulating ammonia water control electric ball valve (9); and (3) circulating ammonia water purging working state: the computer control system closes the pressure-taking control electric ball valve (8) and opens the circulating ammonia water control electric ball valve (9). Under the two working states, the manual internal thread ball valve (10) is in an open state.
4) Pipeline blockage alarm realized by flow switch
The flow switch is arranged on the circulating ammonia water purging pipeline, when the circulating ammonia water is in a fault-free state and the bridge pipe pressure measuring system is in a circulating ammonia water purging state, the flow switch gives an alarm to indicate that the pressure tapping pipeline is seriously blocked and needs to be manually maintained, and the flow switch achieves a pipeline blocking alarm function.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention realizes the functions of coke oven bridge pipe pressure tapping, automatic switching of circulating ammonia water purging and manual maintenance-free by automatically controlling the opening and closing of the electric ball valve in the pressure tapping pipeline through the computer control system according to the process flow. The system effectively improves the traditional coke oven bridge pipe pressure measurement pipeline, solves the problem that substances such as tar, naphthalene, graphite and the like in the crude gas easily cause the blockage of a pressure taking pipeline, overcomes the defect that manual regular cleaning is needed in the traditional measurement method, has the advantages of improving the operating rate of the whole system, realizing automatic maintenance-free coke oven bridge pipe pressure measurement and the like, provides stable, accurate and continuous pressure measurement for the subsequent pressure adjustment of a coke oven carbonization chamber, and provides an effective new way for the crude gas pressure measurement of the coke oven bridge pipe; effective data guarantee is provided for the subsequent pressure regulation of the coking chamber of the coke oven;
2. the problem of blockage of a pressure measuring pipeline can be effectively prevented by circulating ammonia water purging, and the stability of a pressure measuring system is improved;
3. the computer control system can automatically control the circulating ammonia water purging pipeline, so that the working intensity of maintenance personnel is reduced, and the maintenance frequency is reduced;
4. the flow switch can realize the pipeline blockage alarming function.
Drawings
FIG. 1 is a schematic structural diagram of an automatic maintenance-free coke oven bridge pipe pressure measurement system of the present invention;
FIG. 2 is a control flow chart of the automatic maintenance-free coke oven bridge pipe pressure measurement method of the invention.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in figure 1, the automatic maintenance-free coke oven bridge pipe pressure measurement system comprises a pressure tapping connector (1), a micro differential pressure transmitter (2), a nitrogen gas blowing system (3), a plug (4) for maintenance, a first three-way connector (5), a second three-way connector (6), a third three-way connector (7), a pressure tapping control electric ball valve (8), a circulating ammonia water control electric ball valve (9), an internal thread ball valve (10) and a flow switch (11).
The outlet of the ascending pipe bridge of the coke oven is divided into two paths through a first tee joint (5): the device comprises a pressure measuring pipeline and a purging pipeline, wherein the purging pipeline is connected with an internal thread ball valve (10), a circulating ammonia water control electric ball valve (9) and a flow switch (11) in sequence from a purging medium inlet to a first branch interface of a first three-way joint (5); the pressure measurement pipeline divide the kneck by the second of first three way connection (5) to connect gradually and got electronic ball valve of pressure control (8), second three way connection (6) and third three way connection (7), divide out two the tunnel through third three way connection (7): one path is connected with a micro differential pressure transmitter (2), and the other path is connected with a nitrogen blowing system (3).
As shown in fig. 2, a measurement method of an automatic maintenance-free coke oven bridge pipe pressure measurement system includes:
1) purging with low-pressure circulating ammonia water
The low-pressure circulating ammonia water (0.4MPa and 80 ℃) is a common process medium for the furnace top of the coke oven, so that the low-pressure circulating ammonia water purging pipeline is feasible. The problem that the pressure taking pipeline is blocked due to substances such as tar and naphthalene can be effectively solved by periodically using the circulating ammonia water to sweep the pressure taking pipeline.
2) Automatic control of bridge pipe pressure measurement and circulating ammonia water purging
As shown in FIG. 2, the computer control system can automatically determine that the system is in a pressure measurement working state or a circulating ammonia water purging state according to the production state of the coke oven. In the coal charging and coke discharging process of the coke oven, at least two times of low-pressure circulating ammonia water purging can be realized, and the problem of blockage of a pressure tapping pipeline is effectively solved.
a. Coal charging and initial coking after charging (T1)
In the coal charging process, in order to ensure that no raw gas and smoke overflow, the computer control system can automatically and completely open the bridge pipe water seal valve disc of the carbonization chamber without adjusting according to a pressure measurement value. Therefore, the bridge pipe pressure measuring system can be switched to a circulating ammonia water purging working state;
in the initial coking stage (T1) after coal charging, the raw gas generation amount is large, and the bridge pipe water seal valve disc is required to be completely opened and does not need to be adjusted according to a pressure measurement value. Therefore, the bridge pipe pressure measuring system can be switched to a circulating ammonia water purging working state, and the T1 time can be set according to the actual situation on site.
b. Before, at the middle and at the later stage of coking (T2)
Before, in the middle and later coking periods, the computer system can automatically adjust the opening of the water seal valve disc in real time according to the measured value of the bridge pipe pressure to keep the pressure in the carbonization chamber stable. Therefore, the bridge pipe pressure measuring system can be switched to a bridge pipe pressure measuring working state, and the T2 time can be set according to the actual situation on site.
c. Coking last stage (T3)
In the final stage of coking, in order to prevent the problem that negative pressure appears at the bottom of the coking and carbonization chamber and causes the blowby of the furnace wall of the carbonization chamber, the computer control system can automatically close the bridge pipe water seal valve disc of the carbonization chamber without adjusting according to the pressure measurement value. Therefore, the bridge pipe pressure measuring system can be switched to a circulating ammonia water purging working state, and the T3 time can be set according to the actual situation on site.
3) Automatic switching of bridge pipe pressure measurement and circulating ammonia water purging
Bridge pipe pressure measurement operating condition: the computer control system opens the pressure-taking control electric ball valve (8) and closes the circulating ammonia water control electric ball valve (9); and (3) circulating ammonia water purging working state: the computer control system closes the pressure-taking control electric ball valve (8) and opens the circulating ammonia water control electric ball valve (9). Under the two working states, the manual internal thread ball valve (10) is in an open state.
4) Flow switch realizes pipeline blockage alarm function
As shown in figure 1, the invention is provided with a flow switch on a circulating ammonia water purging pipeline. Under the condition that the circulating ammonia water has no fault, when the system is in a circulating ammonia water purging state, the flow switch gives an alarm to indicate that the pressure tapping pipeline is seriously blocked and needs manual maintenance. The flow switch realizes the pipeline blockage alarming function, an early warning mode is provided for pressure tapping pipeline maintenance, and the flow alarming value can be set according to the actual situation on site.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (1)
1. A measuring method of an automatic maintenance-free coke oven bridge pipe pressure measuring system comprises a pressure tapping joint (1), a micro differential pressure transmitter (2), a nitrogen gas blowing system (3), a plug (4) for maintenance, a first three-way joint (5), a second three-way joint (6), a third three-way joint (7), a pressure tapping control electric ball valve (8), a circulating ammonia water control electric ball valve (9), an internal thread ball valve (10) and a flow switch (11);
the outlet of the ascending pipe bridge of the coke oven is divided into two paths through a first tee joint (5): the device comprises a pressure measuring pipeline and a purging pipeline, wherein the purging pipeline is connected with an internal thread ball valve (10), a circulating ammonia water control electric ball valve (9) and a flow switch (11) in sequence from a purging medium inlet to a first branch interface of a first three-way joint (5); the pressure measurement pipeline divide the kneck by the second of first three way connection (5) to connect gradually and got electronic ball valve of pressure control (8), second three way connection (6) and third three way connection (7), divide out two the tunnel through third three way connection (7): one path is connected with a micro differential pressure transmitter (2), and the other path is connected with a nitrogen blowing system (3);
the method is characterized by comprising the following steps:
1) purging with low-pressure circulating ammonia water
The purging medium adopts low-pressure circulating ammonia water: 0.4MPa and 80 ℃;
2) automatic control of bridge pipe pressure measurement and circulating ammonia water purging
The computer control system automatically determines that the system is in a pressure measurement working state or a circulating ammonia water purging state according to the production state of the coke oven; in the coal charging and coke discharging process of the coke oven, at least two times of low-pressure circulating ammonia water purging are realized, and the problem of blockage of a pressure tapping pipeline is effectively solved;
a. coal charging process and coking initial stage after coal charging
In the coal charging process, in order to ensure that no raw gas and smoke overflow, the computer control system automatically and completely opens a bridge pipe water seal valve disc of the carbonization chamber without adjusting according to a pressure measurement value, and the bridge pipe pressure measurement system is automatically switched to a circulating ammonia water purging working state;
in the initial coking stage after coal charging, the generation amount of raw gas is large, the bridge pipe water seal valve disc is required to be completely opened, adjustment is not required according to a pressure measurement value, and the bridge pipe pressure measurement system is automatically switched to a circulating ammonia water purging working state;
b. before, during and after coking
Before, in the middle and later stages of coking, the computer system automatically adjusts the opening of the water seal valve disc in real time according to the measured value of the bridge pipe pressure, so as to keep the pressure in the carbonization chamber stable, and the bridge pipe pressure measuring system is automatically switched to the bridge pipe pressure measuring working state;
c. last stage of coking
In the final stage of coking, in order to prevent the problem that negative pressure appears at the bottom of a coking and carbonization chamber and causes the blow-by of the furnace wall of the carbonization chamber, a computer control system automatically closes a bridge pipe water seal valve disc of the carbonization chamber without adjusting according to a pressure measurement value, and a bridge pipe pressure measurement system is automatically switched to a circulating ammonia water purging working state;
3) automatic switching of bridge pipe pressure measurement and circulating ammonia water purging
Bridge pipe pressure measurement operating condition: the computer control system opens the pressure-taking control electric ball valve (8) and closes the circulating ammonia water control electric ball valve (9); and (3) circulating ammonia water purging working state: the computer control system closes the pressure-taking control electric ball valve (8) and opens the circulating ammonia water control electric ball valve (9); in the two working states, the manual internal thread ball valve (10) is in an open state;
4) pipeline blockage alarm realized by flow switch
The flow switch is arranged on the circulating ammonia water purging pipeline, when the circulating ammonia water is in a fault-free state and the bridge pipe pressure measuring system is in a circulating ammonia water purging state, the flow switch gives an alarm to indicate that the pressure tapping pipeline is seriously blocked and needs to be manually maintained, and the flow switch achieves a pipeline blocking alarm function.
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| CN111774381B (en) * | 2020-03-18 | 2023-12-05 | 华电电力科学研究院有限公司 | Automatic purging device for sampling tube of hearth pressure switch of coal-fired power plant and control method of automatic purging device |
| CN114874788B (en) * | 2022-06-07 | 2023-11-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Remedying method for coke oven gas collecting tube after pressure measuring point blockage |
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| CN203025022U (en) * | 2012-12-18 | 2013-06-26 | 中冶焦耐工程技术有限公司 | Automatic maintenance-free coal gas sampling system of coke oven |
| JP6209820B2 (en) * | 2013-01-10 | 2017-10-11 | 新日鐵住金株式会社 | In-furnace pressure adjusting device and furnace pressure adjusting method for coke oven carbonization chamber |
| CN106221709A (en) * | 2016-07-26 | 2016-12-14 | 杭州和利时自动化有限公司 | The control system of coke oven collecting main pressure |
| CN106595948A (en) * | 2017-01-23 | 2017-04-26 | 中冶焦耐(大连)工程技术有限公司 | Coke oven bridge pipe raw gas pressure detection device |
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