CN110665339B - Security maintenance device for acidic water storage tank and security automatic control method thereof - Google Patents
Security maintenance device for acidic water storage tank and security automatic control method thereof Download PDFInfo
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- CN110665339B CN110665339B CN201911056004.0A CN201911056004A CN110665339B CN 110665339 B CN110665339 B CN 110665339B CN 201911056004 A CN201911056004 A CN 201911056004A CN 110665339 B CN110665339 B CN 110665339B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1412—Controlling the absorption process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—Ammonia
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses an acidic water storage tank security maintenance device and a security self-control method thereof, wherein the acidic water storage tank security maintenance device comprises: an sour water settling tank for receiving sour water and ammonia gas; a sour water buffer tank in communication with the sour water settling tank and in communication with an external sour water stripping system; the ammonia absorption buffer tank is used for receiving and absorbing ammonia, and is communicated with the acidic water sedimentation buffer tank through an ammonia booster pump; the security maintenance device for the acid water storage tank and the security self-control method thereof can effectively avoid tank body breakage or tank collapse, even collapse, caused by a large amount of ammonia gas release during a shutdown stage or ammonia press failure, and ensure the safe and stable operation of the acid water storage tank.
Description
Technical Field
The invention belongs to the technical field of petrochemical engineering environmental protection, and relates to an acidic water storage tank security maintenance device and a security automatic control method thereof.
Background
The ammonia refining system of the hydrogenation acid water stripping device of the oil refinery can urgently discharge a large amount of ammonia and ammonia water under the conditions of daily operation, shutdown stage or ammonia press failure and the like, and the discharged ammonia and ammonia water can be hermetically discharged into an acid water storage tank. Especially in the shutdown stage or when the ammonia press breaks down, a large amount of ammonia need to be released into the acid water storage tank, and a large amount of ammonia entering can cause sewage in the tank to shake violently, and in addition, ammonia is very easy to dissolve in water, and the storage tank pressure appears in the twinkling of an eye and fluctuates widely, extremely easily leads to the tank body to break or flat jar, even collapses, causes the accident.
At present, facilities for pretreatment of the acidic water in refineries of different companies have different styles, and the security guarantee modes of the acidic water are different. The arrangement of the acid water storage tank and related security measures are not uniformly regulated, so that safety problems of different degrees can occur in the production operation process or during the overhaul period, and accidents such as tank collapse, tank top bursting and the like frequently occur in various oil refineries due to unreasonable design of the acid water storage tank security system.
To sum up, aiming at the defects existing in the prior art, it is necessary to develop a safe and environment-friendly sour water storage tank security maintenance device and a safe automatic control system thereof, which are convenient to operate and maintain, so as to ensure the safe and stable operation of the hydrogenation sour water stripping device of the oil refinery.
Disclosure of Invention
In order to solve the problem of instability of an acidic water storage tank security system, the invention provides the acidic water storage tank security maintenance device which is safe, environment-friendly, advanced and reliable and convenient to operate and maintain and the safe self-control method thereof. The acid water storage tank security maintenance device is closely related to the process safety automatic control system and is not limited by the tail gas treatment system, so the acid water storage tank security maintenance device and the safety automatic control system method thereof are mainly described in the invention.
The invention aims at providing a security maintenance device for an acidic water storage tank, which adopts the following technical scheme:
a security maintenance device for an acidic water storage tank,
an sour water settling tank for receiving sour water and ammonia gas;
a sour water buffer tank in communication with the sour water settling tank and in communication with an external sour water stripping system;
the ammonia absorption buffer tank is used for receiving and absorbing ammonia, and is communicated with the acidic water buffer tank through an ammonia booster pump;
a purified water distribution pipe for spraying ammonia is arranged in the ammonia absorption buffer tank, and the purified water distribution pipe is communicated with a purified water conveying pipeline for conveying purified water of the sour water stripping tower;
and the collecting pipe is used for collecting the acidic oil gas at the top of the acidic water sedimentation tank, the acidic oil gas at the top of the acidic water buffer tank and the residual ammonia in the ammonia absorption buffer tank and transporting the residual ammonia to a tail gas treatment facility.
Preferably, the ammonia absorption buffer tank is provided with a second ammonia gas switching valve and a butt clamp type check valve for controlling ammonia gas to enter.
Further, a butt-clamp type check valve is arranged between the air inlet of the ammonia absorption buffer tank and the second ammonia switching valve.
Preferably, an ammonia gas distribution pipe is arranged in the ammonia gas absorption buffer tank, one ammonia gas conveying branch pipe of the ammonia gas conveying main pipe is communicated with the ammonia gas distribution pipe, and the other ammonia gas conveying branch pipe of the ammonia gas conveying pipe is communicated with the acidic water settling tank.
Further, the ammonia gas distribution pipes are symmetrically provided with two rows of exhaust holes, the air injection holes form an injection angle of 30-45 degrees, and the area of each exhaust hole is 1.5-2 times of the cross section area of the ammonia gas distribution pipe.
Preferably, the ammonia gas distribution pipe is 150-300mm away from the bottom of the ammonia gas absorption buffer tank.
Preferably, two rows of water spray holes are symmetrically arranged at two end sides of the purified water distribution pipe, and the ammonia gas distribution pipe is arranged below the purified water distribution pipe.
Further, the area of the water spraying hole is 1.2-1.5 times of the cross section area of the purified water distribution pipe.
Preferably, a spray tower section is arranged on the ammonia absorption buffer tank, and an air outlet at the top of the spray tower section is communicated with the collecting pipe through a gas phase balance pipe.
Preferably, a silk screen foam remover is arranged between the air outlet of the spray tower Duan Dingbu and the purified water distribution pipe.
Preferably, a liquid level transmitter for detecting the liquid level height is arranged on the ammonia absorption buffer tank.
Further, the threshold value of the liquid level transmitter is set to be 20-60% of the volume of the ammonia absorption buffer tank.
Preferably, the design pressure of the ammonia absorption buffer tank is as follows: -0.1-0.35 mpa g, the design pressure of the sour water settling tank and the sour water buffer tank being: -0.5-2 kpa g.
Preferably, the ammonia absorption buffer tank is further provided with a fresh water conveying pipe communicated with an external fresh water conveying device.
Preferably, the bottom outlet of the sour water sedimentation tank is connected with the middle-lower inlet of the sour water buffer tank through an inverted U-shaped pipe.
Further, the top of the acidic water sedimentation tank is communicated with a first air inlet end of a collecting pipe, the top of the acidic water buffer tank is communicated with a second air inlet end of the collecting pipe, and a third air inlet end of the collecting pipe is communicated with an air outlet at the top of the ammonia absorption buffer tank spray tower section.
Further, the sour water sedimentation tank and the sour water buffer tank top are communicated with a nitrogen filling pressure control system, a sedimentation tank nitrogen supplementing valve and a sedimentation tank top pressure transmitter are arranged on the sour water sedimentation tank, and the sour water buffer tank top is provided with a buffer tank nitrogen supplementing valve and a buffer tank top pressure transmitter.
Further, the acidic water settling tank conveys ammonia through an ammonia conveying branch pipe, and a first ammonia switching valve is arranged on the ammonia conveying branch pipe to control the flow of the ammonia entering the acidic water settling tank.
Preferably, a pressure transmitter is arranged on a gas phase balance pipe at the top of the ammonia absorption buffer tank, and a temperature remote transmission indication is arranged in the ammonia absorption buffer tank.
The second purpose of the invention is to provide an instrument automatic control system for the security maintenance device of the acid water storage tank, which adopts the following technical scheme:
an instrument automatic control system for an acidic water storage tank security maintenance device comprises an ammonia absorption buffer automatic control system and an ammonia absorption buffer safety automatic control system;
the instrument automatic control system comprises the following components:
the first flow remote indication and the second flow remote indication are used for detecting the ammonia gas discharge displacement in real time;
the first ammonia gas switching valve is used for controlling ammonia gas to enter the acid water sedimentation tank;
the second ammonia gas switching valve is used for controlling ammonia gas to enter the ammonia gas absorption buffer tank;
the purified water flow control valve is used for controlling the flow of the purified water entering the ammonia absorption buffer tank;
the ammonia water booster pump is used for controlling the ammonia water output of the ammonia absorption buffer tank;
The ammonia water booster pump frequency converter is used for controlling the ammonia water output efficiency of the ammonia water booster pump;
the pressure transmitter is used for detecting the residual ammonia gas displacement at the top of the ammonia gas absorption buffer tank;
the temperature remote transmission indication is used for detecting the temperature in the ammonia absorption buffer tank;
the fresh water switch valve is used for controlling fresh water to enter the ammonia absorption buffer tank;
the ammonia absorption buffer automatic control system comprises: the first flow remote indication, the first ammonia gas switching valve, the second ammonia gas switching valve, the purified water flow control valve, the ammonia water booster pump frequency converter and the purified water flow control valve are controlled by flow automatic linkage;
the ammonia absorption buffer automatic control system is used for controlling accident conditions of the ammonia absorption buffer automatic control system, and the ammonia absorption buffer automatic control system comprises: the second flow remote transmission indication of '3 to 2', the first ammonia gas switching valve, the second ammonia gas switching valve, the pressure transmitter of '3 to 2' and the temperature remote transmission indication of '3 to 2' are arranged;
The ammonia gas conveying pipe flow remote transmission indication, the first ammonia gas switching valve and the second ammonia gas switching valve, the pressure transmitter with the ammonia gas conveying pipe flow remote transmission indication of '3 to get 2', and the temperature remote transmission indication with the ammonia gas conveying pipe flow remote transmission indication of '3 to get 2' are operated through safe automatic control interlocking control.
Further, the flow is automatically linked to trigger by the first flow remote indication reaching a first flow threshold.
Preferably, the mass ratio of the ammonia output quantity to the purified water input quantity in the ammonia absorption buffer tank is automatically controlled by the flow to be 1:10 to 11.
Further, the safety automatic control linkage is triggered and started by any one condition of the second flow remote transmission indication reaching a second flow threshold value, the pressure indication of the pressure transmitter reaching a pressure threshold value or the temperature remote transmission indication reaching a temperature threshold value.
Preferably, the first flow remote indication and the second flow remote indication are arranged on an ammonia conveying main pipe, the first ammonia switch valve is arranged on an ammonia conveying branch pipe connected with the acidic water sedimentation tank, the second ammonia switch valve is arranged on an ammonia conveying branch pipe connected with the ammonia absorption buffer tank, the purified water flow control valve is arranged on a purified water conveying pipe connected with the ammonia absorption buffer tank, the pressure transmitter is arranged on a gas phase balance pipe connected with the top end of the ammonia absorption buffer tank, and the temperature remote indication is arranged on the ammonia absorption buffer tank; the fresh water switch valve is arranged on a fresh water conveying pipe connected with the ammonia absorption buffer tank.
The invention further provides a safety self-control method of the safety maintenance device of the acid water storage tank, which adopts the following technical scheme:
an ammonia absorption buffer self-control method of an acid water storage tank security maintenance device comprises the following steps:
s1, if the security maintenance device of the acid water storage tank is in a normal operation state that the ammonia emission is lower than a second threshold value, starting an ammonia absorption buffer automatic control system to operate;
if the security maintenance device of the acid water storage tank is in an accident working condition state that the ammonia gas emission amount is higher than a second threshold value, starting an ammonia gas absorption buffering safety automatic control system to operate;
s2, the automatic control method of the ammonia absorption buffer automatic control system comprises the following steps: judging whether the flow of the ammonia gas reaches a first threshold value, if the flow of the ammonia gas does not reach the threshold value, automatically controlling the ammonia gas to enter an acidic water sedimentation tank in a linkage manner through the flow, and closing ammonia gas absorption and ammonia water discharge in an ammonia gas absorption buffer tank to realize single-side operation of the ammonia gas absorption buffer automatic control system;
and if the flow of the ammonia gas reaches or is higher than a first threshold value and is lower than a second threshold value, triggering the flow to automatically control the cut-off of the ammonia gas into the acidic water sedimentation tank in a linkage manner, and simultaneously starting the ammonia gas into the ammonia gas absorption buffer tank and the ammonia gas to be discharged, so that the full operation of the ammonia gas absorption buffer automatic control system is realized.
S3, the automatic control method of the ammonia absorption buffer safety automatic control system comprises the following steps: starting a safety automatic control linkage in the full-operation state of the ammonia absorption buffer automatic control system;
and starting fresh water of the ammonia absorption buffer tank to enter through the safety automatic control linkage, starting ammonia to enter the acidic water sedimentation tank until the ammonia flow rate is reduced below a second threshold value, and recovering the ammonia absorption buffer automatic control system to be normal, wherein the safety automatic control linkage closes the valve.
Further, the ammonia absorption buffer automatic control system operates on one side: the flow rate is automatically controlled to be opened by interlocking the first ammonia gas switching valve, the first ammonia gas switching valve and the purified water flow control valve are closed, and the ammonia water booster pump is controlled to be stopped.
Further, the ammonia absorption buffer automatic control system is fully operated as follows: triggering the flow automatic linkage control to cut off the first ammonia gas switching valve, simultaneously, automatically opening the second ammonia gas switching valve and the purified water flow control valve of the ammonia absorption buffer tank by the flow automatic linkage, and starting the ammonia booster pump to operate.
Preferably, when the ammonia absorption buffer automatic control system is fully operated, the opening of the purified water flow control valve is adjusted in real time according to the ammonia flow indication, and the ratio of the ammonia output to the purified water input is 1: and 10-11, regulating the output quantity of the ammonia booster pump.
Preferably, the safety automatic control linkage is started by: the ammonia gas flow indication reaches a second flow threshold, the pressure indication of the pressure transmitter is to a pressure threshold, or the temperature remote indication is to any one of a temperature threshold triggering operation.
The invention has the following beneficial effects:
1) The device adopts the technical scheme that an ammonia absorption buffer tank is additionally arranged in front of an acidic water storage tank of a refinery, a large amount of ammonia gas which is discharged in an emergency way is absorbed by purified water of a stripping tower, the ammonia gas is converted into ammonia water, and ammonia-containing sewage is pressurized by an ammonia water booster pump and sent back to the acidic water storage tank for cyclic treatment. And set up ammonia absorption buffer tank design pressure and be greater than the acid water storage tank far away, realize that ammonia absorption buffer tank both can be resistant malleation, also can full vacuum operation, guarantee in the shutdown stage or when the ammonia press trouble, the effectual jar body that leads to because of a large amount of gas ammonia is released breaks or flat jar, collapses even, guarantee the safe steady operation of acid water storage tank.
2) According to the invention, the ammonia gas distribution pipes are arranged in the ammonia gas absorption buffer tank body, so that the ammonia gas can be efficiently and uniformly distributed and dispersed in water, and the instantaneous absorption rate of the ammonia gas is improved.
3) According to the invention, the top of the ammonia absorption buffer tank body is provided with the spray tower section, and the spray tower section is internally provided with the purified water distribution pipe, so that the purified water and unabsorbed ammonia can be ensured to be fully contacted and efficiently transferred, and the secondary absorption of ammonia tail gas can be completed while water is supplemented into the tank; a silk screen foam remover is arranged between the top of the spray tower section and the purified water distribution pipe, so that the ammonia gas pipeline is prevented from carrying free liquid to the tail gas treatment system.
4) According to the invention, the butt-clamp type check valve is arranged between the second ammonia gas switching valve and the ammonia gas inlet of the ammonia gas absorption buffer tank, compared with other valve type check valves, the butt-clamp type check valve is smaller in air resistance, and the valve is required to be installed close to the suction inlet of the ammonia gas absorption buffer tank, so that ammonia water can be effectively prevented from flowing backwards to an ammonia gas discharge pipeline to form a liquid seal, the ammonia gas accident discharge is influenced, and the safety of an upstream device is ensured.
5) The invention sets a set of ammonia absorption buffer automatic control system, adopts a first ammonia remote transmission indication, detects ammonia discharge displacement in real time, and timely closes an ammonia absorption buffer tank inlet switch valve and a purified water flow control valve according to the ammonia flow condition by automatic flow interlocking control to stop an ammonia booster pump; and the flow rate can automatically control the starting-up operation of the ammonia water booster pump in a chained manner when the device is in a shutdown stage or the ammonia press fails, and the device can save energy and water on the premise of ensuring the security maintenance stability of the storage tank through the ammonia flow rate indication.
6) The invention provides a set of ammonia absorption buffer safety automatic control system, and by setting a second ammonia flow remote transmission indication of '3 for 2', an ammonia inlet switch valve, a fresh water switch valve, a pressure transmitter '3 for 2' for exhausting the ammonia absorption buffer tank and a tank body temperature indication of '3 for 2', accidents caused by serious overtemperature and overpressure of the ammonia absorption buffer tank can be effectively prevented, so that the safe operation of the whole system is ensured.
7) The safety automatic control method can automatically start the ammonia absorption buffer automatic control system to operate or the ammonia absorption buffer safety automatic control system to operate according to the operation condition of the safety maintenance device of the acid water storage tank, can timely adjust the on-off state of each part in the instrument system, realizes energy and water saving when the safety maintenance device normally operates, and can also stably operate and timely restore to the normal operation state under the emergency working condition.
Drawings
The above features, technical features, advantages and implementation of the present invention will be further described in the following description of preferred embodiments with reference to the accompanying drawings in a clear and easily understood manner.
FIG. 1 is a schematic diagram of the security maintenance device and the instrument automatic control system of the acid water storage tank.
Reference numerals illustrate:
1. an acidic water settling tank; 2. an acidic water buffer tank; 3. a safe water sealed tank; 4. an ammonia absorption buffer tank; 5. ammonia booster pump; 6. a nitrogen supplementing valve of the settling tank; 7. a settling tank top pressure transmitter; 8. a buffer tank nitrogen supplementing valve; 9. a buffer tank top pressure transmitter; 10a, a first traffic remote indication; 10b, a second traffic remote indication; 11. a purified water flow control valve; 12. a liquid level transmitter; 13. an ammonia water hydraulic control valve; 14. an ammonia water booster pump frequency converter; 15. a pressure transmitter; 16. a temperature remote transmission indication; 17. a fresh water switch valve; 18. a butt-clip type check valve; 19. a purified water distribution pipe; 20. an ammonia gas distribution pipe; 21. a first ammonia gas switching valve; 22. a second ammonia gas switching valve; 23. an acidic water booster pump; 24. a wire mesh demister.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product.
Example 1
As shown in fig. 1, a security maintenance device for an acidic water storage tank,
an sour water settling tank for receiving sour water and ammonia gas;
an sour water buffer tank in communication with the sour water settling tank and in communication with an external sour water stripping system;
the ammonia absorption buffer tank is used for receiving and absorbing ammonia, and is communicated with the acidic water sedimentation buffer tank through an ammonia booster pump;
a purified water distribution pipe for spraying ammonia is arranged in the ammonia absorption buffer tank, and the purified water distribution pipe is communicated with a purified water conveying pipeline for conveying purified water of the sour water stripping tower;
And the collecting pipe is used for collecting the acidic oil gas at the top of the acidic water sedimentation tank, the acidic oil gas at the top of the acidic water buffer tank and the residual ammonia in the ammonia absorption buffer tank and transporting the residual ammonia to a tail gas treatment facility.
An acid water storage tank is formed by the acid water sedimentation tank 1 and the acid water buffer tank 2, so that the acid inner dirty oil and other impurities are fully settled, and the acid water entering an external acid water stripping system is ensured to be less in impurities; and through setting up ammonia absorption buffer tank 4 and sour water setting tank 1 common absorption from ammonia atmospheric spot everywhere, slow down the pressure that sour water setting tank 1 absorbed ammonia when a large amount of ammonia got into. Meanwhile, the ammonia absorption buffer tank 4 absorbs a large amount of ammonia which is discharged in an emergency way through utilizing the purified water of the stripping tower, and converts the ammonia into ammonia water, so that the effect of recycling the purified water generated by the acid water stripping system is realized, and ammonia sewage generated by the ammonia absorption buffer tank 4 is sent back to the acid water buffer tank 2 and the acid water sedimentation tank 1 for cyclic treatment. The collecting pipe conveys ammonia gas and acid oil gas in the security maintenance device of the whole acid water storage tank to the tail gas treatment facility of the existing acid water treatment system, so that accidents caused by leakage or excessive residual ammonia gas are effectively avoided. By adopting the design of the ammonia absorption buffer tank 4 and the sour water storage tank, the tank body is effectively prevented from being broken or collapsed, even collapsed, caused by the release of a large amount of ammonia gas in the shutdown stage of the hydrogenation sour water stripping device of the oil refinery or the failure of the ammonia press, and the safe and stable operation of the storage tank is ensured.
The ammonia absorption buffer tank 4 is provided with a second ammonia on-off valve 22 for controlling the entry of ammonia and a butt-clip type check valve 18. In this embodiment, the second ammonia gas switching valve 22 is provided to control the flow of ammonia gas entering the ammonia gas absorbing buffer tank 4, so as to timely control the ammonia gas absorbing capacity of the ammonia gas absorbing buffer tank 4 according to the state change of the whole security maintenance device. The arrangement of the butt clamp type check valve 18 can effectively prevent ammonia water from flowing backward to an ammonia gas discharge pipeline to form a liquid seal, so that ammonia gas discharge is influenced, and the safety of an upstream device is ensured.
Further, a butt-clip type check valve 18 is disposed between the air inlet of the ammonia absorption buffer tank 4 and the second ammonia on-off valve 22, that is, the butt-clip type check valve 18 is disposed closer to the ammonia absorption buffer tank 4 than the second ammonia on-off valve 22. Compared with other valve types, the clamp type check valve 18 has smaller air resistance, ensures that ammonia gas can quickly enter the ammonia gas absorption buffer tank 4, and ensures that ammonia water cannot enter an ammonia gas transportation pipeline.
Example 2
On the basis of the embodiment 1, an ammonia gas distribution pipe 20 is arranged in the ammonia gas absorption buffer tank 4, one ammonia gas conveying branch pipe of an ammonia gas conveying main pipe is communicated with the ammonia gas distribution pipe 20, and the other ammonia gas conveying branch pipe of the ammonia gas conveying pipe is communicated with the acidic water settling tank 1.
By absorbing ammonia gas in two ways, the pressure fluctuation in the acidic water sedimentation tank can be avoided; the ammonia branch pipe can enable the ammonia entering the ammonia absorption buffer tank 4 to be sprayed along a certain direction, so that the ammonia is prevented from being instantaneously diffused into the tank body.
Further, the ammonia gas distribution pipes 20 are symmetrically provided with two rows of exhaust holes, and the air injection holes form an injection angle of 30-45 degrees, so that ammonia gas can be injected to the bottom wall of the ammonia gas absorption buffer tank 4, and the first time of the ammonia gas is ensured to be in contact with purified water stored in the tank.
Furthermore, the area of the exhaust hole is 1.5-2 times of the cross section area of the ammonia gas distribution pipe 20, so that the output speed of ammonia gas can be ensured when a large amount of ammonia gas enters, and the ammonia gas is ensured to be uniformly distributed in water with high efficiency.
As a preferred further embodiment, the ammonia gas distributor tube 20 is 150-300mm from the tank bottom. If the set height is too low, a large amount of ammonia gas is accumulated at the bottom of the tank, the local ammonia water concentration is too high to be saturated, so that air resistance is formed, the output of the ammonia gas distribution pipe 20 is not smooth, and if the set height is too high, the ammonia gas is difficult to fully contact with the purified water at the bottom, so that the ammonia gas absorption efficiency is affected.
In practical use, in the above embodiment, the distance between the ammonia gas distribution pipe 20 and the tank bottom is set according to the input flow of the purified water and the height of the tank body, that is, the concentration of ammonia water in the tank is ensured not to be saturated, and enough installation space is provided for other components, so that the absorption of ammonia gas is ensured to be faster. The size of the aperture of the air spraying hole is determined according to the actual ammonia gas conveying amount, so that the spraying range of ammonia gas is ensured.
Example 3
On the basis of embodiment 1 or 2, two rows of water spray holes are symmetrically designed at both end sides of the purified water distribution pipe 19, and an ammonia gas distribution pipe 20 is provided below the purified water distribution pipe 19. Through the arrangement of the water spraying holes, the spraying area of the purified water is enlarged, the contact area of the purified water and the ammonia gas is improved, and the dissolution of the ammonia gas is accelerated. The purified water distribution pipe 19 can ensure that purified water is fully contacted with unabsorbed ammonia gas, and the mass transfer is efficient, and the secondary absorption of ammonia gas tail gas is completed when water is supplemented into the tank.
Further, the area of the water spray holes is 1.2 to 1.5 times the cross-sectional area of the purified water distribution pipe 19. Further ensuring the output speed and the spraying area of the purified water.
Example 4
On the basis of embodiment 1, 2 or 3, a spray tower section is arranged on the ammonia absorption buffer tank, and an air outlet at the top of the spray tower section is communicated with a collecting pipe through a gas phase balance pipe; through the setting of gaseous phase balance pipe, ensure that only the ammonia when exceeding certain pressure can get into the collecting pipe in, avoid under the normal condition ammonia to spill over, cause absorption efficiency lower.
Further, a wire mesh demister 24 is arranged between the air outlet of the spray tower Duan Dingbu and the purified water distribution pipe 19.
The silk screen demister 24 ensures the dryness of the ammonia gas output from the top air outlet of the spray tower section, and prevents the ammonia gas overflowed from the ammonia gas absorption buffer tank 4 from being provided with free liquid to the tail gas treatment system, so that the tail gas treatment effect is affected.
Example 5
On the basis of the embodiments 1-4, the ammonia absorption buffer tank 4 is provided with a liquid level transmitter 12 for detecting the liquid level in the tank in real time.
Further, the threshold value of the liquid level transmitter 12 is set to be 20-60% of the volume of the ammonia absorption buffer tank 4.
In a more preferred embodiment, a hydraulic control valve is arranged on an ammonia water output pipe communicated with the bottom of the ammonia absorption buffer tank 4, and the hydraulic control valve is used for controlling the output quantity of the ammonia water of the ammonia absorption buffer tank 4.
Preferably, the ammonia booster pump 5 controls the output efficiency of the ammonia booster pump 5 through an ammonia booster pump frequency converter 14.
Furthermore, an ammonia water hydraulic control valve 13 is arranged on the ammonia water output pipe and is used for controlling the output quantity of the ammonia water.
In this embodiment, through the liquid level signal feedback of liquid level transmitter, learn ammonia water liquid level in the ammonia absorption buffer tank 4, adjust ammonia water hydraulically controlled valve 13 aperture in real time according to the ammonia water liquid level again, keep the in-tank liquid level between 20 ~ 60%, prevent that in-tank liquid level is too low, ammonia water booster pump 5 from appearing evacuating, or find untimely, the condition that ammonia absorption buffer tank 4 takes out the flat.
Example 6
On the basis of examples 1-5, the design pressure of the ammonia absorption buffer tank 4 is: -0.1-0.35 mpa g, the design pressure of the sour water settling tank and the sour water buffer tank 2 is: -0.5-2 kpa g.
The ammonia absorption buffer tank 4 is arranged in the embodiment, so that the ammonia absorption buffer tank 4 can not only resist positive pressure, but also can be operated in full vacuum, and the ammonia absorption buffer tank 4 mainly bears pressure change generated in the process of releasing a large amount of ammonia or dissolving a large amount of ammonia. In the process of releasing a large amount of ammonia, a large amount of ammonia is controlled to enter the ammonia absorption buffer tank 4, meanwhile, the pressure is instantaneously reduced due to the large amount of ammonia dissolution, negative pressure is formed in the ammonia absorption buffer tank 4, and the storage tank normally absorbs ammonia. By increasing the pressure bearing range of the ammonia absorption buffer tank 4, the stable operation of the storage tank can be ensured, and a sudden large amount of ammonia can be stably absorbed.
On the basis of the embodiments 1-5, the ammonia absorption buffer tank 4 is also provided with a fresh water delivery pipe communicated with an external fresh water delivery device. The fresh water delivery pipe can make fresh water as the supplement of purified water, and when the purified water ammonia absorption is saturated, the ammonia can be continuously absorbed, so that the excessive pressure in the ammonia absorption buffer tank 4 is avoided.
Further, the fresh water supply pipe is provided with a fresh water switching valve 17. The fresh water switch valve 17 is used for controlling the input time of fresh water, so that the energy and water conservation of the acid water storage tank are effectively realized.
On the basis of the embodiments 1-5, the outlet at the bottom of the acid water sedimentation tank 1 is connected with the inlet at the middle lower part of the acid water buffer tank 2 through an inverted U-shaped pipe, so that the acid water in the acid water sedimentation tank 1 can enter the acid water buffer tank 2 for a sufficient residence time, oil-water layering and sludge sedimentation are realized, and dirty oil in the acid water sedimentation tank 1 and precipitated sludge at the bottom are prevented from entering the acid water buffer tank 2.
The top of the acidic water sedimentation tank 1 is communicated with a first air inlet end of a collecting pipe, the top of the acidic water buffer tank 2 is communicated with a second air inlet end of the collecting pipe, and a third air inlet end of the collecting pipe is communicated with an air outlet at the top of the spraying tower section of the ammonia absorption buffer tank 4. Realize that ammonia and acid oil gas in acid water settling cask 1, acid water buffer tank 2 and ammonia absorption buffer tank 4 can all be through the collecting pipe unified transport to safe water seal tank 3 and tail gas treatment facility department guarantee the safety of three jar bodies.
Still further, sour water settling cask 1 and sour water buffer tank 2 tank deck intercommunication have and fill nitrogen gas pressure control system, be provided with settling cask nitrogen supplementing valve 6 and settling cask roof pressure transmitter 7 on the sour water settling cask 1, sour water buffer tank 2 tank deck is provided with buffer tank nitrogen supplementing valve 8 and buffer tank roof pressure transmitter 9.
The nitrogen supplementing valve is arranged to timely supplement nitrogen for maintaining stable pressure in the acidic water sedimentation tank 1 and the acidic water buffer tank 2, so that the tank can not be shrunken when the pressure in each tank drops sharply.
On the basis of the embodiments 1-5, a first ammonia gas switching valve 21 is arranged on an ammonia gas conveying branch pipe communicated with the acidic water sedimentation tank 1, so that the flow of ammonia gas entering the acidic water sedimentation tank 1 is controlled, and the pressure in the tank and the stability of settled sludge are ensured.
On the basis of the embodiments 1-5, a pressure transmitter 15 is arranged on a gas phase balance pipe at the top of the ammonia absorption buffer tank 4, and a temperature remote transmission indication 16 is arranged inside the ammonia absorption buffer tank 4. For detecting in real time the exhaust pressure and the in-tank temperature in the ammonia absorption buffer tank 4.
On the basis of the embodiments 1-5, a first flow remote transmission indication 10a and a second flow remote transmission indication are arranged on the ammonia gas conveying main pipe and are used for detecting the conveying flow of ammonia gas in real time and regulating and controlling a corresponding control system according to the flow of the ammonia gas.
Example 7
Referring to fig. 1, the embodiment is an instrument automatic control system for an acidic water storage tank security maintenance device, wherein the instrument automatic control system comprises an ammonia absorption buffer automatic control system and an ammonia absorption buffer safety automatic control system;
The instrument automatic control system comprises the following components:
the first flow remote indication 10a and the second flow remote indication 10b are used for detecting the ammonia gas discharge displacement in real time;
a first ammonia gas switching valve 21 for controlling ammonia gas to enter the sour water settling tank 1;
a second ammonia gas switching valve 22 for controlling the ammonia gas to enter the ammonia gas absorption buffer tank 4;
the purified water flow control valve 11 is used for controlling the flow of the purified water entering the ammonia absorption buffer tank 4;
an ammonia booster pump 5 for controlling the ammonia output of the ammonia absorption buffer tank 4;
the frequency converter of the ammonia booster pump 5 is used for controlling the ammonia output efficiency of the ammonia absorption buffer tank 4;
a pressure transmitter 15 for detecting the remaining ammonia displacement at the top of the ammonia absorption buffer tank 4;
a temperature remote indication 16 for detecting the temperature in the ammonia absorption buffer tank 4;
a fresh water switch valve 17 for controlling fresh water to enter the ammonia absorption buffer tank 4; .
The ammonia absorption buffer automatic control system comprises: the first flow remote transmission indication 10a, the first ammonia gas switching valve 21, the second ammonia gas switching valve 22, the purified water flow control valve 11, the ammonia water booster pump 5 frequency converter and the purified water flow control valve 11, and the ammonia gas conveying pipe pressure transmitter 15, the first ammonia gas switching valve 21, the second ammonia gas switching valve 22, the purified water flow control valve 11, the ammonia water booster pump 5 frequency converter and the ammonia water booster pump 5 are controlled through flow automatic linkage.
Still further, the flow is automatically linked to the first flow threshold trigger by the first flow telemetry indication 10 a.
Preferably, the mass ratio of the ammonia input amount to the purified water input amount in the ammonia absorption buffer tank 4 is automatically controlled by the flow to be 1:10 to 11.
By adopting the ammonia absorption buffer automatic control system, the ammonia input quantity, the purified water input quantity and the ammonia output quantity in the ammonia absorption buffer tank 4 can be controlled in real time according to the first flow remote transmission indication 10a, and the whole security maintenance device can save energy and water on the premise of ensuring the security maintenance stability of the storage tank.
The ammonia absorption buffer automatic control system is used for controlling accident conditions of the ammonia absorption buffer automatic control system, and the ammonia absorption buffer automatic control system comprises: the second flow remote transmission indicator 10b provided with "3 get 2", the first ammonia gas switching valve 21, the second ammonia gas switching valve 22, the pressure transmitter 15 provided with "3 get 2", and the temperature remote transmission indicator 16 provided with "3 get 2";
the ammonia gas conveying pipe flow remote transmission indication provided with '3 and 2', the first ammonia gas switching valve 21, the second ammonia gas switching valve 22, the pressure transmitter 15 provided with '3 and 2' and the temperature remote transmission indication 16 provided with '3 and 2' are operated through safe automatic control interlocking control.
Further, the safety interlock is triggered by any one or more of the second flow rate remote indicator 10b reaching a second flow rate threshold, the pressure transmitter 15 pressure indicator reaching a pressure threshold, or the temperature remote indicator 16 reaching a temperature threshold.
The ammonia absorption buffer automatic control system can timely adjust the internal environment of the ammonia absorption buffer tank 44 when the ammonia absorption buffer tank 44 has accident working conditions, effectively prevent accidents caused by serious overtemperature and overpressure of the ammonia absorption buffer tank 44, and further ensure the safe operation of the whole safe maintenance device.
In this embodiment, the first flow remote indication 10a and the second flow remote indication 10b are arranged on an ammonia gas conveying main pipe, the first ammonia gas switching valve 21 is arranged on an ammonia gas conveying branch pipe connected with the acidic water sedimentation tank 1, the second ammonia gas switching valve 22 is arranged on an ammonia gas conveying branch pipe connected with the ammonia gas absorption buffer tank 4, the purified water flow control valve 11 is arranged on a purified water conveying pipe connected with the ammonia gas absorption buffer tank 4, the pressure transmitter 15 is arranged on a gas phase balance pipe connected with the top end of the ammonia gas absorption buffer tank 4, and the temperature remote indication 16 is arranged on the ammonia gas absorption buffer tank 4; a fresh water on-off valve 17 is provided on a fresh water delivery pipe connected to the ammonia absorption buffer tank 4.
Example 8
The embodiment is a safety self-control method of an acid water storage tank safety maintenance device, comprising the following steps:
s1, if the security maintenance device of the acid water storage tank is in a normal operation state that the ammonia emission is lower than a second threshold value, starting an ammonia absorption buffer automatic control system to operate;
if the security maintenance device of the acid water storage tank is in an accident working condition state that the ammonia gas emission amount is higher than a second threshold value, starting an ammonia gas absorption buffering safety automatic control system to operate;
s2, the automatic control method of the ammonia absorption buffer automatic control system comprises the following steps: judging whether the flow of the ammonia gas reaches a first threshold value, if the flow of the ammonia gas does not reach the threshold value, automatically controlling the ammonia gas to enter the acidic water sedimentation tank 1 through flow linkage, and closing ammonia gas absorption and ammonia water discharge in the ammonia gas absorption buffer tank 4 to realize single-side operation of the ammonia gas absorption buffer automatic control system;
if the flow of the ammonia gas reaches or is higher than a first threshold value and is lower than a second threshold value, triggering the flow to automatically control the cut-off of the ammonia gas into the acidic water sedimentation tank 1 in a linkage manner, and simultaneously starting the ammonia gas into the ammonia gas absorption buffer tank 4 and the ammonia gas to be discharged, so that the full operation of the ammonia gas absorption buffer automatic control system is realized.
S3, the automatic control method of the ammonia absorption buffer safety automatic control system comprises the following steps: starting a safety automatic control linkage in the full-operation state of the ammonia absorption buffer automatic control system;
And starting fresh water in the ammonia absorption buffer tank 4 by the safety automatic control linkage, starting ammonia to enter the acidic water sedimentation tank 1 until the ammonia flow rate is reduced below a second threshold value, and recovering the ammonia absorption buffer automatic control system to be normal, wherein the safety automatic control linkage is closed.
Further, the ammonia absorption buffer automatic control system operates on one side: the flow rate is automatically controlled to be opened by interlocking the first ammonia gas switching valve 21, the first ammonia gas switching valve 21 and the purified water flow control valve 11 are closed, and the ammonia water booster pump 5 is controlled to be stopped.
Further, the ammonia absorption buffer automatic control system is fully operated as follows: the first ammonia gas switching valve 21 is cut off by triggering the automatic flow interlocking control, meanwhile, the inlet switching valve of the ammonia gas absorption buffer tank 4 and the purified water flow control valve 11 are opened by the automatic flow interlocking control, and the ammonia booster pump 5 is started to operate. Further, the safety automatic control linkage starts the fresh water switch valve 17 to be opened in a linkage manner, and controls the first ammonia gas switch valve 21 to be opened in a linkage manner, so that fresh water enters the ammonia gas absorption buffer tank 4, and ammonia gas enters the acid water sedimentation tank 1.
Furthermore, when the ammonia absorption buffer automatic control system is fully operated, the opening of the purified water flow control valve 11 is adjusted in real time according to the first flow remote transmission indication 10a in the ammonia flow indication, and the ratio 1 of the ammonia output to the purified water input is calculated: and 10-11, regulating the output quantity of the ammonia booster pump 5.
Further, the safety automatic control linkage is started by: the second flow remote indicator 10b of the ammonia flow indication reaches a second flow threshold, the pressure indication of the pressure transmitter is to a pressure threshold, or the temperature remote indicator is to any one of a temperature threshold to trigger operation.
The automatic control method of the ammonia absorption buffer automatic control system can not only ensure the security and maintenance stability of the storage tank, but also realize energy and water conservation of the device.
During actual use, under the accident condition, especially, the ammonia emission is high, the purified water flow control valve 11 is invalid, the ammonia dissolution heat in the ammonia absorption buffer tank 4 can not be transferred in time, the heat is rapidly accumulated, once the temperature in the absorption tank is higher than 90 ℃, ammonia water is largely vaporized, the excessive temperature and the excessive pressure of the absorption tank are caused, and a large amount of ammonia breaks through a water seal and is discharged to the atmosphere, so that the environmental pollution is caused, and even the production and the personal safety of the device can be influenced.
By the control method of the ammonia absorption buffer safety automatic control system, when the ammonia emission is too high, the ammonia conveying pipe pressure transmitter 10 exceeds a second threshold value, or a large amount of heat is released during ammonia absorption to cause the serious overtemperature of the ammonia absorption buffer tank 4, or a large amount of ammonia enters the absorption buffer tank, and the safety automatic control chain control system is triggered to start when the ammonia exceeds a set pressure threshold value indicated by the pressure. The safety automatic control interlocking system controls the fresh water switch valve 17 to be opened in an interlocking way, fresh water rapidly enters the ammonia absorption buffer tank 4 for quenching and cooling, and simultaneously inhibits the occurrence of massive vaporization of ammonia water; meanwhile, an ammonia gas inlet switch valve of the acidic water sedimentation tank 1 is opened in a linkage way, part of ammonia gas enters the acidic water sedimentation tank 1, the ammonia gas absorption buffer tank 4 is slowed down to continuously heat up, and the valve is closed in a linkage way until an ammonia gas absorption system is recovered to be normal; effectively ensuring the safety and stability of the acid water storage tank.
Example 9
The system is characterized in that a petrochemical company is provided with an acid water storage tank system of an acid water stripping device with 60 tons/hour, the ammonia refining system of the device is operated daily, in a shutdown stage or in an ammonia press failure and other emergency emission of a large amount of ammonia, the emission amount is about 0-3000 kg/h, and the ammonia emission amount is far beyond the daily maximum value of the acid water storage tank for receiving the ammonia;
daily operating state: the pressure in the acid water sedimentation tank 1 and the acid water buffer tank 2 is controlled to be-500 to +2000PaG, so that the safety of the two storage tanks is ensured. The tops of the acidic water sedimentation tank 1 and the acidic water buffer tank 2 are respectively provided with a nitrogen-filled pressure control system. When the pressure of the pressure transmitter at the top of the acid water tank of the two storage tanks is lower than 320PaG, the sedimentation tank nitrogen supplementing valve 6 and the buffer tank nitrogen supplementing valve 8 are opened, and when the pressure value of the pressure transmitter at the top of the sedimentation tank 7 and the pressure transmitter at the top of the buffer tank 9 reaches 500PaG, the sedimentation tank nitrogen supplementing valve 6 and the buffer tank nitrogen supplementing valve 8 are closed.
The ammonia conveying main pipe is provided with a first ammonia flow indicator 10a, and the ammonia discharge displacement is detected in real time. When the device is in normal operation, the ammonia gas discharge amount is about 0-500 kg/h, the ammonia gas discharge amount is less, and the stable operation of the storage tank is not influenced. At the moment, the opening degree of the purified water flow control valve 11 is automatically controlled by the flow in a linkage way, the first ammonia gas inlet switching valve of the acidic water sedimentation tank 1 is kept on, the energy and water saving are considered, the second ammonia gas switching valve 22 of the ammonia gas absorption buffer tank 4 and the purified water flow control valve 11 are simultaneously closed, and the ammonia booster pump 5 is stopped;
When the device is in a shutdown stage or an ammonia press fails, the ammonia emission is about 500-2500 kg/h, and is larger, at the moment, the first ammonia inlet switch valve 21 of the acidic water sedimentation tank 1 is cut off through the automatic flow interlocking control system, the second ammonia switch valve 22 of the ammonia absorption buffer tank 4 and the purified water flow control valve 11 are simultaneously opened, the ammonia booster pump 5 is started and operated, the opening of the purified water flow control valve 11 is regulated in real time through the ammonia flow indication of the first flow remote transmission indication 10a, and the mass ratio of ammonia to purified water is 1: 10-11, and simultaneously adjusting the frequency of the frequency converter 14 of the ammonia booster pump to ensure that the ammonia delivery flow is matched with the frequency converter.
The specific operation process is as follows: ammonia is delivered from each emptying point through an ammonia delivery pipeline in two ways, one way is delivered to the acidic water settling tank 1 through the first ammonia switching valve 21, and the other way is connected into the ammonia absorption buffer tank 4 through the second ammonia switching valve 22 and the butt clamp type check valve 18. The ammonia entering the ammonia absorption buffer tank 4 is output through the ammonia distribution pipe 20, so that the ammonia is ensured to be uniformly distributed and dispersed in water.
The purified water flow control valve 11 is normally opened, and is connected into the purified water distribution pipe 19 in the spray tower section to timely supplement water to the ammonia absorption buffer tank 4. Ammonia water in the ammonia absorption buffer tank 4 is output to an ammonia water booster pump 5, and is conveyed into the acidic water buffer tank 2 through an ammonia water hydraulic control valve 13 after being boosted. Meanwhile, the liquid level transmitter 12 in the tank body of the ammonia absorption buffer tank 4 detects the liquid level in the tank in real time, and adjusts the opening of the ammonia water hydraulic control valve 13 in real time through liquid level signal feedback, so that the liquid level in the tank is kept between 20 and 60 percent. Fresh water is intermittently fed into the corresponding inlet of the ammonia absorption buffer tank 4 through the on-off of the fresh water switch valve 17.
In order to avoid accident working conditions, an ammonia gas conveying pipe flow remote transmission indicator 10b is arranged, a '3 taking 2' is arranged, a flow indicator is fed back timely, a pressure transmitter 15 is arranged on a gas phase balance pipe at the top of the ammonia gas absorption buffer tank 4, the pressure indicator is arranged at the '3 taking 2', a temperature remote transmission indicator 16 is arranged on a tank body of the ammonia gas absorption buffer tank 4, and the temperature remote transmission indicator 16 is arranged at the '3 taking 2'.
When accident conditions occur, such as ammonia gas emission amount up to 2500-3000 kg/h, or the temperature in the tank exceeds 90 ℃, or the gas phase pressure at the top of the tank exceeds 2000PaG, or ammonia gas emission amount up to 2500-3000 kg/h, the safe automatic control interlocking start is triggered. Especially when the ammonia gas discharge amount reaches 2500-3000 kg/h or the purified water flow control valve 11 fails, the ammonia gas dissolution heat in the ammonia gas absorption buffer tank 4 can not be transferred in time, the heat is rapidly accumulated, once the temperature in the absorption tank is higher than 90 ℃, ammonia water is largely vaporized, so that the absorption tank is excessively heated and overpressurized, and a large amount of ammonia gas breaks through a water seal and is discharged into the atmosphere, thereby causing environmental pollution and even affecting the production of the device and personal safety.
When an accident working condition occurs, the safety automatic control interlocking system is started, the fresh water switch valve 17 is opened in an interlocking way, fresh water rapidly enters the ammonia absorption buffer tank 4 for quenching and cooling, and meanwhile, the occurrence of massive vaporization of ammonia water is inhibited; at the same time, the first ammonia gas switching valve 21 of the acidic water settling tank 1 is opened in a linkage way, and part of ammonia gas enters the acidic water settling tank 1, so that the ammonia gas absorption buffer tank 4 is slowed down to continue to heat up until the safety automatic control linkage system is closed after the ammonia gas absorption buffer automatic control system is normal.
It should be noted that, the above embodiments may be freely combined according to needs, and for other numerous combinations, the details are not repeated here. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (8)
1. An ammonia absorption buffer automatic control method of an acid water storage tank security maintenance device is characterized by comprising the following steps:
s1, if the security maintenance device of the acid water storage tank is in a normal operation state that the ammonia emission is lower than a second threshold value, starting an ammonia absorption buffer automatic control system to operate;
if the security maintenance device of the acid water storage tank is in an accident working condition state that the ammonia gas emission amount is higher than a second threshold value, starting an ammonia gas absorption buffering safety automatic control system to operate;
s2, the automatic control method of the ammonia absorption buffer automatic control system comprises the following steps: judging whether the flow of the ammonia gas reaches a first threshold value, if the flow of the ammonia gas does not reach the threshold value, automatically controlling the ammonia gas to enter an acidic water sedimentation tank in a linkage manner through the flow, and closing ammonia gas absorption and ammonia water discharge in an ammonia gas absorption buffer tank to realize single-side operation of the ammonia gas absorption buffer automatic control system;
If the flow of the ammonia gas reaches or is higher than a first threshold value and is lower than a second threshold value, triggering the flow to automatically control the cut-off of the ammonia gas into the acidic water sedimentation tank in a linkage manner, and simultaneously starting the ammonia gas in the ammonia gas absorption buffer tank to enter and the ammonia gas to be discharged, so that the full operation of the ammonia gas absorption buffer automatic control system is realized;
s3, the automatic control method of the ammonia absorption buffer safety automatic control system comprises the following steps: starting a safety automatic control linkage in the full-operation state of the ammonia absorption buffer automatic control system;
and starting fresh water of the ammonia absorption buffer tank to enter through the safety automatic control linkage, starting ammonia to enter the acidic water sedimentation tank until the ammonia flow rate is reduced below a second threshold value, and recovering the ammonia absorption buffer automatic control system to be normal, wherein the safety automatic control linkage closes the valve.
2. The utility model provides an sour water storage tank security dimension steady device which characterized in that includes:
an sour water settling tank for receiving sour water and ammonia gas;
a sour water buffer tank in communication with the sour water settling tank and in communication with an external sour water stripping system;
the ammonia absorption buffer tank is used for receiving and absorbing ammonia, and is communicated with the acidic water sedimentation buffer tank through an ammonia booster pump;
A purified water distribution pipe for spraying ammonia is arranged in the ammonia absorption buffer tank, and the purified water distribution pipe is communicated with a purified water conveying pipeline for conveying purified water of the sour water stripping tower;
the collecting pipe is provided with a first air outlet end and a second air outlet end, the first air outlet end is communicated with a safe water sealed tank, the safe water sealed tank is communicated with the acid water sedimentation tank through an overflow pipe for overflow sewage, and the second air outlet end is communicated with a tail gas treatment facility and is used for collecting the acid water sedimentation tank, the acid oil gas on the tank top of the acid water buffer tank and residual ammonia in the ammonia absorption buffer tank and transporting the acid oil gas and the residual ammonia to the tail gas treatment facility;
the instrument automatic control system comprises an ammonia absorption buffer automatic control system and an ammonia absorption buffer safety automatic control system;
the instrument automatic control system comprises the following components:
the first flow remote indication and the second flow remote indication are used for detecting the ammonia gas discharge displacement in real time;
the first ammonia gas switching valve is used for controlling ammonia gas to enter the acid water sedimentation tank;
the second ammonia gas switching valve is used for controlling ammonia gas to enter the ammonia gas absorption buffer tank;
the purified water flow control valve is used for controlling the flow of the purified water flowing into the ammonia absorption buffer tank;
The ammonia water booster pump is used for controlling the ammonia water output of the ammonia absorption buffer tank;
the ammonia water booster pump frequency converter is used for controlling the ammonia water output efficiency of the ammonia water booster pump;
the pressure transmitter is used for detecting the residual ammonia gas displacement at the top of the ammonia gas absorption buffer tank;
the temperature remote transmission indication is used for detecting the temperature in the ammonia absorption buffer tank;
the fresh water switch valve is used for controlling fresh water to enter the ammonia absorption buffer tank;
the ammonia absorption buffer automatic control system comprises: the first flow remote indication, the first ammonia gas switching valve, the second ammonia gas switching valve, the purified water flow control valve, the ammonia water booster pump frequency converter and the purified water flow control valve are controlled in an automatic flow linkage manner;
the ammonia absorption buffer safety automatic control system is used for controlling accident conditions of the ammonia absorption buffer automatic control system, and the ammonia absorption buffer safety automatic control system comprises: the second flow remote indication, the first ammonia gas switch valve, the second ammonia gas switch valve, the pressure transmitter and the temperature remote indication are respectively provided with the '3 get 2', the second flow remote indication, the first ammonia gas switch valve and the second ammonia gas switch, the pressure transmitter and the temperature remote indication are operated through safe automatic control linkage control.
3. The sour water storage tank security maintenance device of claim 2, wherein:
the ammonia absorption buffer tank is provided with a second ammonia switch valve and a butt clamp type check valve for controlling ammonia to enter; and/or the number of the groups of groups,
an ammonia gas distribution pipe is arranged in the ammonia gas absorption buffer tank, the ammonia gas distribution pipe is communicated with one ammonia gas conveying branch pipe of an ammonia gas conveying main pipe, and the other ammonia gas conveying branch pipe of the ammonia gas conveying main pipe is communicated with the acidic water sedimentation tank;
the ammonia gas distribution pipes are symmetrically provided with two rows of exhaust holes, and the air injection holes form an injection angle of 30-45 degrees;
the distance between the ammonia gas distribution pipe and the bottom of the ammonia gas absorption buffer tank is 150-300mm.
4. The sour water storage tank security maintenance device of claim 3, wherein:
two rows of water spraying holes are symmetrically arranged at two end sides of the purified water distribution pipe, and the ammonia gas distribution pipe is arranged below the purified water distribution pipe;
the area of the water spraying hole is 1.2-1.5 times of the cross section area of the purified water distribution pipe.
5. The sour water storage tank security maintenance device of claim 2, wherein:
a spray tower section is arranged on the ammonia absorption buffer tank, and an air outlet at the top of the spray tower section is communicated with a collecting pipe through a gas phase balance pipe; and/or the number of the groups of groups,
A silk screen foam remover is arranged between the air outlet of the spray tower Duan Dingbu and the purified water distribution pipe.
6. The sour water storage tank security maintenance device of claim 2, wherein:
the ammonia absorption buffer tank is provided with a liquid level transmitter for detecting the liquid level height;
the threshold value of the liquid level transmitter is set to be 20-60% of the volume of the ammonia absorption buffer tank; and/or the number of the groups of groups,
and the ammonia absorption buffer tank is also provided with a fresh water conveying pipe communicated with an external fresh water conveying device.
7. The sour water storage tank security maintenance device of claim 2, wherein:
the flow is automatically linked and triggered by the first flow remote transmission indication reaching a first flow threshold; and/or the number of the groups of groups,
the mass ratio of the ammonia input quantity to the purified water input quantity in the ammonia absorption buffer tank is controlled by the flow automatic linkage to be 1: 10-11.
8. The sour water storage tank security maintenance device of claim 2, wherein the secure autonomous linkage is initiated by any one of the second flow rate remote indication reaching a second flow rate threshold trigger, the pressure transmitter pressure indication reaching a pressure threshold, or the temperature remote indication reaching a temperature threshold.
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