CN110665339A - Security and stability maintenance device for acidic water storage tank and safety automatic control method thereof - Google Patents
Security and stability maintenance device for acidic water storage tank and safety automatic control method thereof Download PDFInfo
- Publication number
- CN110665339A CN110665339A CN201911056004.0A CN201911056004A CN110665339A CN 110665339 A CN110665339 A CN 110665339A CN 201911056004 A CN201911056004 A CN 201911056004A CN 110665339 A CN110665339 A CN 110665339A
- Authority
- CN
- China
- Prior art keywords
- ammonia
- gas
- water
- tank
- absorption buffer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a security and stability maintenance device of an acid water storage tank and a safety automatic control method thereof, wherein the security and stability maintenance device of the acid water storage tank comprises the following components: an acid water settling tank for receiving acid water and ammonia gas; the acidic water buffer tank is communicated with the acidic water settling tank and is communicated with an external acidic 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 safety and stability maintaining device for the acidic water storage tank and the safety automatic control method thereof can effectively avoid tank body breakage or tank collapse or even collapse caused by release of a large amount of gas ammonia in the shutdown stage or ammonia press failure, and ensure safe and stable operation of the acidic water storage tank.
Description
Technical Field
The invention belongs to the technical field of petrochemical engineering environmental protection, and relates to a security and stability maintenance device for an acidic water storage tank and a safety automatic control method thereof.
Background
An ammonia refining system of a hydrogenation acidic water stripping device of an oil refinery can emergently discharge a large amount of ammonia gas and ammonia water under the conditions of daily operation, shutdown stage or ammonia press failure and the like, and the discharged ammonia gas and ammonia water are hermetically discharged into an acidic water storage tank. Especially when the shutdown stage or ammonia press trouble, a large amount of ammonia need release pressure to in the acid water storage tank, and the entering of a large amount of gas ammonia can cause in-tank sewage violently to rock, and gas ammonia is very easily dissolved in water in addition, and storage tank pressure appears fluctuating on a large scale in the twinkling of an eye, very easily leads to the jar body to break or shrivelled jar, even collapses, causes the accident.
At present, the facility styles of the acid water pretreatment of oil refineries of different companies are different, and the safety guarantee modes of the acid water are also different. The arrangement of the acid water storage tank and related security measures are not uniformly specified, so that safety problems of different degrees can occur in the production running process or during maintenance, and accidents such as tank shrinkage, tank top burst and the like frequently occur in oil refineries in various places due to unreasonable design of the acid water storage tank security system.
In summary, in order to overcome the defects in the prior art, it is necessary to develop a safe and stable device for an acidic water storage tank and a safe and automatic control system thereof, which are safe and environmentally friendly and convenient to operate and maintain, so as to ensure the safe and stable operation of a hydrogenation acidic water stripping device in an oil refinery.
Disclosure of Invention
In order to solve the problem of instability of the security system of the acid water storage tank, the invention provides the security and stability maintaining device of the acid water storage tank and the security and automatic control method thereof, which are safe, environment-friendly, advanced, reliable and convenient to operate and maintain. The device for maintaining the stability of the acid water storage tank is closely related to a process safety automatic control system and is not limited to a tail gas treatment system, so the device for maintaining the stability of the acid water storage tank and a safety automatic control system method thereof are mainly explained in the invention.
One of the purposes of the invention is to provide a security and stability maintenance device for an acid water storage tank, which adopts the following technical scheme:
a security and stability maintaining device for an acid water storage tank,
an acid water settling tank for receiving acid water and ammonia gas;
the acidic water buffer tank is communicated with the acidic water settling tank and is communicated with an external acidic 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 gas is arranged in the ammonia gas absorption buffer tank and is communicated with a purified water conveying pipeline for conveying purified water of the acidic water stripping tower;
and the collecting pipe is used for collecting the acidic oil gas at the top of the acidic water settling tank and the acidic water buffer tank and transporting the residual ammonia gas in the ammonia gas absorption buffer tank to a tail gas treatment facility.
Preferably, the ammonia gas absorption buffer tank is provided with a second ammonia gas switch valve and a wafer check valve for controlling the entry of ammonia gas.
Further, the wafer check valve is arranged between the air inlet of the ammonia gas absorption buffer tank and the second ammonia switch valve.
Preferably, be provided with the ammonia distribution pipe in the ammonia absorption buffer tank, the ammonia distribution pipe intercommunication has one of them ammonia delivery branch pipe of ammonia delivery header, another ammonia delivery branch pipe of ammonia delivery pipe with the sour water setting tank is linked together.
Furthermore, two rows of exhaust holes are symmetrically formed in the ammonia gas distribution pipe, the gas 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 distance between the ammonia distribution pipe and the bottom of the ammonia absorption buffer tank is 150-300 mm.
Preferably, two rows of water spray holes are symmetrically designed at two ends 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 spray holes is 1.2-1.5 times of the cross-sectional area of the purified water distribution pipe.
Preferably, the ammonia absorption buffer tank is provided with a spray tower section, and a gas outlet at the top of the spray tower section is communicated with the collecting pipe through a gas phase balance pipe.
Preferably, a wire mesh demister is arranged between the air outlet at the top of the spray tower section and the purified water distribution pipe.
Preferably, the ammonia absorption buffer tank is provided with a liquid level transmitter for detecting the liquid level height.
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 MpaG, wherein the design pressure of the acid water settling tank and the acid water buffer tank is as follows: -0.5 to 2 KpaG.
Preferably, the ammonia absorption buffer tank is further provided with a fresh water delivery pipe communicated with an external fresh water delivery device.
Preferably, an outlet at the bottom of the acidic water settling tank is connected with an inlet at the middle lower part of the acidic water buffer tank through an inverted U-shaped pipe.
Furthermore, the top of the acidic water settling 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 spray tower section of the ammonia gas absorption buffer tank.
Further, sour water settling cask and sour water buffer tank deck intercommunication have and fill nitrogen gas pressure control system, be provided with settling cask nitrogen supplement valve and settling cask top pressure transmitter on the sour water settling cask, sour water buffer tank deck is provided with buffer tank nitrogen supplement valve and buffer tank top pressure transmitter.
Further, the acid water settling tank conveys ammonia gas through an ammonia gas conveying branch pipe, and a first ammonia gas switch valve is arranged on the ammonia gas conveying branch pipe and used for controlling the flow of the ammonia gas entering the acid water settling tank.
Preferably, a pressure transmitter is arranged on the gas phase balance pipe at the top of the ammonia absorption buffer tank, and a temperature remote transmission indicator is arranged inside the ammonia absorption buffer tank.
The invention also aims to provide an instrument automatic control system for the safety and stability maintenance device of the acidic water storage tank, which adopts the following technical scheme:
an instrument automatic control system for a security and stability maintenance device of an acid water storage tank comprises an ammonia absorption buffer automatic control system and an ammonia absorption buffer safety automatic control system;
the meter automatic control system comprises the following components:
the first flow remote transmission indication and the second flow remote transmission indication are used for detecting the discharge capacity of the released ammonia gas in real time;
the first ammonia switch valve is used for controlling ammonia to enter the acidic water settling tank;
the second ammonia switch 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 purified water entering the ammonia absorption buffer tank;
the ammonia water booster pump is used for controlling the ammonia water output of the ammonia gas 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 exhaust amount of the residual ammonia gas 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;
a fresh water switch valve for controlling the fresh water to enter the ammonia absorption buffer tank;
the ammonia absorption buffer automatic control system comprises: the ammonia delivery pipe pressure transmitter, the first ammonia switch valve, the second ammonia switch valve, the purified water flow control valve, the ammonia water booster pump frequency converter and the purified water flow control valve are automatically controlled in an interlocking manner through flow;
the ammonia absorption buffering autonomous system is used for controlling the accident condition of the ammonia absorption buffering autonomous system, and the ammonia absorption buffering autonomous system comprises: the second flow remote transmission indication of '2 out of 3', a first ammonia switch valve, a second ammonia switch valve, a pressure transmitter of '2 out of 3' and a temperature remote transmission indication of '2 out of 3' are arranged;
the ammonia gas delivery pipe flow remote transmission indicator is provided with a '2 from 3', the first ammonia gas switch valve, the second ammonia gas switch valve, the pressure transmitter provided with the '2 from 3' and the temperature remote transmission indicator provided with the '2 from 3' are all operated under the interlocking control of safety automatic control.
Further, the flow rate automatic interlock is triggered by the first flow rate telemetering indication reaching a first flow rate threshold.
Preferably, the flow rate is automatically controlled in a linkage manner, and the mass ratio of the output quantity of the ammonia gas in the ammonia gas absorption buffer tank to the input quantity of the purified water is 1: 10 to 11.
Further, the safety automatic control chain is triggered and started by any one of the conditions that the second flow remote transmission indication reaches a second flow threshold value, the pressure indication of the pressure transmitter reaches a pressure threshold value, or the temperature remote transmission indication reaches a temperature threshold value.
Preferably, the first flow remote transmission indication and the second flow remote transmission indication are arranged on an ammonia gas conveying main pipe, the first ammonia switch valve is arranged on an ammonia gas conveying branch pipe connected with the acidic water settling tank, the second ammonia switch valve is arranged on an ammonia gas conveying branch pipe connected with an ammonia gas absorption buffer tank, the purified water flow control valve is arranged on a purified water conveying pipe connected with the ammonia gas absorption buffer tank, the pressure transmitter is arranged on a gas phase balance pipe connected with the top end of the ammonia gas absorption buffer tank, and the temperature remote transmission indication is arranged on the ammonia gas absorption buffer tank; and the fresh water switch valve is arranged on a fresh water conveying pipe connected with the ammonia absorption buffer tank.
The invention also aims to provide a safety automatic control method of the acid water storage tank security and stability maintenance device, which adopts the following technical scheme:
an ammonia absorption buffer self-control method of a security and stability maintenance device of an acid water storage tank comprises the following steps:
s1, if the safety protection and stability 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 the ammonia absorption buffer automatic control system to operate;
if the safety protection and stability maintenance device of the acidic water storage tank is in an accident working condition state that the ammonia gas discharge 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 ammonia flow reaches a first threshold value, if not, automatically controlling the ammonia to enter an acid water settling tank through flow linkage, closing ammonia absorption and ammonia water discharge in an ammonia absorption buffer tank, and realizing the unilateral operation of the ammonia absorption buffer automatic control system;
and if the flow of the ammonia reaches or is higher than the first threshold value and lower than the second threshold value, triggering flow automatic interlocking control to cut off the ammonia from entering the acid water settling tank, and simultaneously starting the ammonia in the ammonia absorption buffer tank to enter and discharge ammonia water to realize the full operation of the ammonia absorption buffer automatic control system.
S3, the automatic control method of the ammonia absorption buffer safety automatic control system comprises the following steps: starting a safety automatic control chain in the full operation state of the ammonia absorption buffer automatic control system;
and the safety automatic control linkage starts fresh water of the ammonia absorption buffer tank to enter, and opens ammonia to enter the acidic water settling tank until the flow of the ammonia is reduced to be below a second threshold value, the ammonia absorption buffer automatic control system recovers to be normal, and the safety automatic control linkage closes the valve.
Further, the ammonia absorption buffer automatic control system operates on one side: and the flow automatic interlocking controls the opening of the first ammonia switch valve, the closing of the first ammonia switch valve and the purified water flow control valve, and controls the shutdown of the ammonia booster pump.
Further, the full operation of the ammonia absorption buffer automatic control system is as follows: triggering the automatic linkage control of the flow to cut off the first ammonia switch valve, simultaneously automatically opening the second ammonia switch valve and the purified water flow control valve of the ammonia absorption buffer tank in a linkage manner, and starting the ammonia booster pump to operate.
Preferably, when the ammonia absorption buffer automatic control system runs completely, according to ammonia flow indication, the opening of the purified water flow control valve is adjusted in real time, and according to the proportion of ammonia water output to purified water input 1: 10-11 regulating the output of the ammonia booster pump.
Preferably, the safety-controlled interlock is activated 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 telemetric indication is to a temperature threshold.
The invention can bring the following beneficial effects:
1) the device adopts the technical scheme that an ammonia absorption buffer tank is additionally arranged in front of an acid water storage tank of a refinery, purified water of a stripping tower is used for absorbing a large amount of ammonia which is discharged emergently, the ammonia is converted into ammonia water, and then ammonia-containing sewage is pressurized by an ammonia water booster pump and is sent back to the acid water storage tank for circular treatment. And set up ammonia absorption buffer tank design pressure and be greater than the acid water storage tank, realize that ammonia absorption buffer tank both can be resistant malleation, also can full vacuum operation, guarantee when shutdown stage or ammonia press trouble, the effectual jar body of avoiding leading to because of a large amount of gas ammonia are released breaks or flat jar, even collapses, guarantee acid water storage tank safe and stable's operation.
2) According to the invention, the ammonia gas distribution pipe is arranged in the ammonia gas absorption buffer tank body, so that the ammonia gas can be uniformly distributed in water with high efficiency, and the instantaneous absorption rate of the ammonia gas is improved.
3) According to the invention, the spray tower section is arranged at the top of the ammonia absorption buffer tank body, and the purified water distribution pipe is arranged in the spray tower section, so that the purified water can be ensured to be in full contact with unabsorbed ammonia and to be subjected to efficient mass transfer, and the secondary absorption of ammonia tail gas can be completed while water is supplemented into the tank; and a wire mesh demister is arranged between the top of the spray tower section and the purified water distribution pipe, so that the ammonia pipeline is prevented from carrying the free liquid to the tail gas treatment system.
4) According to the ammonia gas absorption buffer tank, the wafer type check valve is arranged between the second ammonia switch valve and the ammonia gas inlet of the ammonia gas absorption buffer tank, the gas resistance of the wafer type check valve is smaller than that of other valve types, the wafer type check valve needs to be installed close to the suction inlet of the ammonia gas absorption buffer tank, and the arrangement can effectively prevent ammonia water from flowing backwards to an ammonia gas discharge pipeline to form liquid seal, so that the accidental discharge of ammonia gas is influenced, and the safety of upstream devices is guaranteed.
5) The invention is provided with a set of ammonia absorption buffer automatic control system, adopts a first ammonia remote transmission instruction to detect the discharge capacity of ammonia in real time, and closes an inlet switch valve and a purified water flow control valve of an ammonia absorption buffer tank in time according to the ammonia flow condition through automatic flow linkage control, and stops the ammonia booster pump; and when the device is in a shutdown stage or the ammonia press is in fault, the flow automatically controls the ammonia water booster pump to start and operate in an interlocking manner, and the energy and water conservation of the device are realized on the premise of ensuring the security and stability of the storage tank through the ammonia gas flow indication.
6) The invention is provided with a set of ammonia absorption buffer safety automatic control system, and can effectively prevent accidents caused by serious over-temperature and over-pressure of the ammonia absorption buffer tank by setting a second ammonia flow remote transmission indication of '3 to 2', an ammonia inlet switch valve, a fresh water switch valve, a pressure transmitter '3 to 2' exhausted by the ammonia absorption buffer tank and a temperature indication of '3 to 2' of the ammonia absorption buffer tank body, thereby ensuring the safe operation of the whole system.
7) The safety automatic control method can automatically start the ammonia gas absorption buffer automatic control system or the ammonia gas absorption buffer safety automatic control system to operate according to the operation condition of the safety protection and stability maintenance device of the acidic water storage tank, can timely adjust the on-off state of each component in an instrument system, realizes energy and water conservation during normal operation of the safety protection and stability maintenance device, and can also stably operate and timely recover to a normal operation state under the condition of an emergent accident.
Drawings
The above features, technical features, advantages and modes of realisation of the present invention will be further described in the following detailed description of preferred embodiments thereof, which is to be read in connection with the accompanying drawings.
FIG. 1 is a schematic structural diagram of a security and stability maintenance device and an instrument automatic control system of an acidic water storage tank according to the present invention.
The reference numbers illustrate:
1. an acid water settling tank; 2. an acid water buffer tank; 3. sealing the tank with safe water; 4. an ammonia absorption buffer tank; 5. an ammonia booster pump; 6. a nitrogen supplementing valve of the settling tank; 7. a pressure transmitter on the top of the settling tank; 8. a buffer tank nitrogen supplement valve; 9. a buffer tank top pressure transmitter; 10a, a first flow remote indication; 10b, second flow remote indication; 11. a purified water flow control valve; 12. a liquid level transmitter; 13. an ammonia liquid control valve; 14. an ammonia booster pump frequency converter; 15. a pressure transmitter; 16. a temperature remote indication; 17. a fresh water switch valve; 18. a wafer check valve; 19. a purified water distribution pipe; 20. an ammonia gas distribution pipe; 21. a first ammonia switch valve; 22. a second ammonia 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 be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product.
Example 1
As shown in fig. 1, a security and stability maintaining device for an acid water storage tank,
an acid water settling tank for receiving acid water and ammonia gas;
an acidic water buffer tank in communication with the acidic water settling tank and in communication with an external acidic 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 gas is arranged in the ammonia gas absorption buffer tank and is communicated with a purified water conveying pipeline for conveying purified water of the acidic water stripping tower;
and the collecting pipe is used for collecting the acidic oil gas at the top of the acidic water settling tank and the acidic water buffer tank and transporting the residual ammonia gas in the ammonia gas absorption buffer tank to a tail gas treatment facility.
An acidic water settling tank 1 and an acidic water buffer tank 2 are arranged to jointly form an acidic water storage tank, so that the dirty oil and other impurities in the acidic water are fully settled, and the acidic water entering an external acidic water stripping system is less in impurities; and the ammonia gas from each part of the ammonia gas emptying point is absorbed together by the ammonia gas absorption buffer tank 4 and the acidic water settling tank 1, and the pressure of the acidic water settling tank 1 for absorbing the ammonia gas is effectively reduced when a large amount of ammonia gas enters. Meanwhile, the ammonia absorption buffer tank 4 absorbs a large amount of ammonia which is emergently discharged by using the purified water of the stripping tower, the ammonia is converted into ammonia water, the effect of recycling the purified water generated by the acidic water stripping system is realized, and the ammonia sewage generated by the ammonia absorption buffer tank 4 is sent back to the acidic water buffer tank 2 and the acidic water settling tank 1 for circular treatment. The collecting pipe conveys ammonia gas and acidic oil gas in the whole acidic water storage tank security and maintenance stabilizing device to a tail gas treatment facility of the existing acidic water treatment system, and accidents caused by leakage or excess of the residual ammonia gas are effectively avoided. By adopting the design of the ammonia gas absorption buffer tank 4 and the acidic water storage tank, the tank body can be effectively prevented from being broken or shriveled or even collapsed due to the release of a large amount of ammonia gas in the shutdown stage of a hydrogenation acidic water stripping device of an oil refinery or the failure of an ammonia press, and the safe and stable operation of the storage tank is ensured.
The ammonia gas absorption buffer tank 4 is provided with a second ammonia gas switching valve 22 for controlling the entry of ammonia gas and a wafer type check valve 18. This embodiment realizes controlling the ammonia flow that gets into in the ammonia absorption buffer tank 4 through setting up second ammonia ooff valve 22, maintains the ammonia uptake of steady device state change in time control ammonia absorption buffer tank 4 according to whole security. The arrangement of wafer formula check valve 18 can prevent effectively that the aqueous ammonia from flowing backward to the ammonia pipeline of releasing and forming the liquid seal, influences the ammonia and releases, ensures the safety of upper reaches device.
Further, the wafer type check valve 18 is disposed between the air inlet of the ammonia gas absorption buffer tank 4 and the second ammonia switching valve 22, that is, the wafer type check valve 18 is disposed closer to the ammonia gas absorption buffer tank 4 than the second ammonia switching valve 22. The wafer check valve 18 is smaller in air resistance than other valve types, so that ammonia can rapidly enter the ammonia absorption buffer tank 4, and ammonia cannot enter an ammonia transportation pipeline.
Example 2
On the basis of embodiment 1, be provided with ammonia distribution pipe 20 in the ammonia absorption buffer tank 4, ammonia distribution pipe 20 intercommunication has one of them ammonia delivery branch pipe of ammonia delivery house steward, another ammonia delivery branch pipe of ammonia delivery pipe with sour water setting tank 1 is linked together.
The ammonia gas is absorbed in two paths, so that the pressure fluctuation in the acidic water settling tank can be avoided; the ammonia gas branch pipe can make the ammonia gas that gets into in the ammonia absorption buffer tank 4 spray along certain direction, avoids the ammonia to spread inside the jar body in the twinkling of an eye.
Further, two rows of exhaust holes are symmetrically formed in the ammonia gas distribution pipe 20, and the gas 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 ammonia gas is ensured to be contacted with purified water stored in the tank at the first time.
Furthermore, the area of the exhaust hole is 1.5-2 times of the area of the cross section of the ammonia distribution pipe 20, so that the output speed of ammonia can be ensured when a large amount of ammonia enters, and the ammonia is ensured to be efficiently and uniformly distributed in water.
As another preferred embodiment, the ammonia gas distribution pipe 20 is 150-300mm away from the tank bottom. If set up highly low and can lead to a large amount of ammonia to gather at the tank bottoms, local aqueous ammonia concentration is too high to reach the saturation, forms the air lock, causes ammonia distributing pipe 20 output not smooth, if set up highly too high, then the ammonia is difficult to fully contact with bottom purified water, influences ammonia absorption efficiency.
In the time of practical use, in the above-mentioned embodiment, the ammonia gas distribution pipe 20 is apart from the input flow of tank bottoms and the high setting of the jar body according to the purified water, guarantees promptly that the aqueous ammonia concentration in the jar can not saturate, and gives other part sufficient installation space, ensures that the absorption of ammonia is faster. The size of the aperture of the gas injection hole is determined according to the actual ammonia gas delivery amount, so that the injection range of the ammonia gas is ensured.
Example 3
On the basis of the embodiment 1 or 2, two rows of water spray holes are symmetrically designed at two end sides of the purified water distribution pipe 19, and the ammonia gas distribution pipe 20 is arranged below the purified water distribution pipe 19. Through the setting of hole for water spraying, enlarge the area of spraying of purifying waste water, improve the area of contact of purifying waste water and ammonia for the dissolution of ammonia. The purified water distribution pipe 19 can ensure that the purified water is in full contact with unabsorbed ammonia gas and has high-efficiency mass transfer, and the secondary absorption of the ammonia gas tail gas is completed while 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 of the purified water and the spraying area.
Example 4
On the basis of the embodiment 1, 2 or 3, a spray tower section is arranged on the ammonia gas absorption buffer tank, and a gas outlet at the top of the spray tower section is communicated with a collecting pipe through a gas phase balance pipe; the arrangement of the gas phase balance pipe ensures that only ammonia gas exceeding a certain pressure can enter the collecting pipe, so that the ammonia gas is prevented from overflowing under normal conditions, and the absorption efficiency is low.
Further, a wire mesh demister 24 is arranged between the air outlet at the top of the spray tower section and the purified water distribution pipe 19.
The silk screen demister 24 guarantees the aridity of the ammonia of output from the gas outlet at the top of the spray tower section, and avoids the ammonia that overflows in the ammonia absorption buffer tank 4 to have dissociative liquid to the tail gas treatment system, which affects the tail gas treatment effect.
Example 5
On the basis of the embodiments 1 to 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 preferable embodiment, an ammonia water output pipe communicated with the bottom of the ammonia gas absorption buffer tank 4 is provided with a hydraulic control valve, and the hydraulic control valve is used for controlling the ammonia water output quantity of the ammonia gas absorption buffer tank 4.
Preferably, the ammonia water booster pump 5 controls the output efficiency of the ammonia water booster pump 5 through an ammonia water booster pump frequency converter 14.
Furthermore, an ammonia water hydraulic control valve 13 is arranged on the ammonia water output pipe and used for controlling the output quantity of the ammonia water.
In this embodiment, through liquid level signal feedback of liquid level transmitter, learn ammonia water liquid level in the ammonia absorption buffer tank 4, adjust 13 opennesses of ammonia water liquid accuse valve in real time according to ammonia water liquid level again, keep the interior liquid level of jar between 20 ~ 60%, prevent that the interior liquid level of jar from crossing lowly, the aqueous ammonia booster pump 5 appears managing to find out to empty, or the discovery is untimely, the condition that ammonia absorption buffer tank 4 took out to shrivele appears.
Example 6
On the basis of examples 1 to 5, the design pressure of the ammonia absorption buffer tank 4 is as follows: 0.1-0.35 MpaG, wherein the design pressure of the acid water settling tank and the acid water buffer tank 2 is as follows: -0.5 to 2 KpaG.
The ammonia absorption buffer tank 4 arranged in the embodiment can resist positive pressure and can be operated in full vacuum, so that 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, control a large amount of ammonia and get into ammonia absorption buffer tank 4, the ammonia dissolves in a large amount simultaneously and causes pressure to descend in the twinkling of an eye, forms the negative pressure in ammonia absorption buffer tank 4, and the storage tank normally carries out ammonia and absorbs. 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 large amount of sudden ammonia can be stably absorbed.
On the basis of the embodiments 1 to 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 conveying pipe is arranged, so that fresh water can be used as supplement of purified water, ammonia gas can be continuously absorbed when the purified water is saturated in ammonia gas absorption, and the phenomenon that the pressure in the ammonia gas absorption buffer tank 4 is too high is avoided.
Further, a fresh water switching valve 17 is provided on the fresh water delivery pipe. The fresh water switch valve 17 is used for controlling the input time of fresh water, and effectively realizes the energy saving and water saving of the acid water storage tank.
On the basis of the embodiments 1 to 5, the outlet at the bottom of the acidic water settling tank 1 is connected with the inlet at the middle lower part of the acidic water buffer tank 2 through an inverted U-shaped pipe, so that sufficient retention time is ensured when the acidic water in the acidic water settling tank 1 enters the acidic water buffer tank 2, oil-water stratification and sludge settling are realized, and dirty oil in the acidic water settling tank 1 and precipitated sludge at the bottom are prevented from entering the acidic water buffer tank 2.
The top of the acidic water settling 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 a spray tower section of the ammonia gas absorption buffer tank 4. Realize ammonia and acid oil gas homoenergetic in acid water settling cask 1, acid water buffer tank 2 and the ammonia absorption buffer tank 4 and can unify through the collecting tube and carry extremely safe water seal tank 3 and tail gas treatment facility department guarantee the safety of three jar of bodies.
Furthermore, the acidic water settling tank 1 and the acidic water buffer tank 2 are communicated with a nitrogen filling pressure control system, the acidic water settling tank 1 is provided with a settling tank nitrogen supplementing valve 6 and a settling tank top pressure transmitter 7, and the acidic water buffer tank 2 is provided with a buffer tank nitrogen supplementing valve 8 and a buffer tank top pressure transmitter 9.
The nitrogen is timely supplemented through the nitrogen supplementing valve, so that the pressure in the acidic water settling tank 1 and the pressure in the acidic water buffer tank 2 are stable, and the tank cannot be shriveled when the pressure in each tank drops sharply.
On the basis of the embodiments 1 to 5, the ammonia gas delivery branch pipe communicated with the acidic water settling tank 1 is provided with a first ammonia gas switch valve 21 for controlling the flow of ammonia gas entering the acidic water settling tank 1, so as to ensure the pressure in the tank and the stability of settled sludge.
On the basis of the embodiments 1 to 5, a pressure transmitter 15 is arranged on the gas phase balance pipe at the top of the ammonia absorption buffer tank 4, and a temperature remote indication 16 is arranged inside the ammonia absorption buffer tank 4. The device is used for detecting the exhaust pressure in the ammonia absorption buffer tank 4 and the temperature in the tank in real time.
On the basis of the embodiments 1 to 5, the ammonia gas transmission main pipe is provided with a first flow rate remote transmission instruction 10a and a second flow rate remote transmission instruction, which are used for detecting the transmission flow rate of ammonia gas in real time and regulating and controlling a corresponding control system according to the flow rate of ammonia gas.
Example 7
With reference to fig. 1, this embodiment is an instrument automatic control system for a safety protection and stability maintenance device of an acidic water storage tank, where the instrument automatic control system includes an ammonia absorption buffer automatic control system and an ammonia absorption buffer safety automatic control system;
the meter automatic control system comprises the following components:
the first flow remote transmission indicator 10a and the first flow remote transmission indicator 10b are used for detecting the discharge capacity of the released ammonia gas in real time;
the first ammonia switch valve 21 is used for controlling ammonia to enter the acidic water settling tank 1;
the second ammonia switch valve 22 is used for controlling 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;
the ammonia water booster pump 5 is used for controlling the ammonia water output of the ammonia gas absorption buffer tank 4;
the ammonia water booster pump 5 is used for controlling the ammonia water output efficiency of the ammonia gas absorption buffer tank 4;
the pressure transmitter 15 is used for detecting the exhaust amount of the residual ammonia gas at the top of the ammonia gas 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 the entry of fresh water into the ammonia absorption buffer tank 4; .
The ammonia absorption buffer automatic control system comprises: the ammonia gas conveying pipe is characterized by comprising a first flow remote transmission indicator 10a, a first ammonia switch valve 21, a second ammonia switch valve 22, a purified water flow control valve 11, an ammonia water booster pump 5 frequency converter and a purified water flow control valve 11, wherein an ammonia gas conveying pipe pressure transmitter 15, the first ammonia switch valve 21, the second ammonia switch 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 automatically controlled in an interlocking mode through flow.
Further, the flow rate is automatically linked to reach a first flow rate threshold trigger by the first flow rate telemetric indication 10 a.
Preferably, the flow rate is automatically interlocked to control the mass ratio of the input amount of the ammonia gas to the input amount of the purified water in the ammonia gas absorption buffer tank 4 to be 1: 10 to 11.
By adopting the ammonia absorption buffer automatic control system, the input quantity of ammonia, the input quantity of purified water and the output quantity of ammonia water in the ammonia absorption buffer tank 4 can be controlled in real time according to the first flow remote indication 10a, so that the energy and water conservation of the whole security and stability maintenance device can be realized on the premise of ensuring the security and stability maintenance of the storage tank.
The ammonia absorption buffering autonomous system is used for controlling the accident condition of the ammonia absorption buffering autonomous system, and the ammonia absorption buffering autonomous system comprises: the second flow remote indication 10b of '2 out of 3', a first ammonia gas switch valve 21, a second ammonia gas switch valve 22, a pressure transmitter 15 of '2 out of 3' and a temperature remote indication 16 of '2 out of 3' are arranged;
the ammonia gas delivery pipe flow remote transmission indicator provided with the '2 from 3', the first ammonia gas switch valve 21, the second ammonia gas switch valve 22, the pressure transmitter 15 provided with the '2 from 3' and the temperature remote transmission indicator 16 provided with the '2 from 3' are all operated under the interlocking control of safety automatic control.
Further, the safety interlock is triggered by any one or more of the second flow threshold being reached by the second flow remote indicator 10b, the pressure threshold being reached by the pressure transmitter 15, or the temperature threshold being reached by the temperature remote indicator 16.
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 conditions, and effectively prevents accidents caused by serious overtemperature and overpressure of the ammonia absorption buffer tank 44, thereby ensuring the safe operation of the whole safety maintenance device.
In this embodiment, the first flow remote indicator 10a and the second flow remote indicator 10b are disposed on an ammonia gas delivery manifold, the first ammonia switch valve 21 is disposed on an ammonia gas delivery branch pipe connected to the acidic water settling tank 1, the second ammonia switch valve 22 is disposed on an ammonia gas delivery branch pipe connected to the ammonia gas absorption buffer tank 4, the purified water flow control valve 11 is disposed on a purified water delivery pipe connected to the ammonia gas absorption buffer tank 4, the pressure transmitter 15 is disposed on a gas phase equilibrium pipe connected to the top end of the ammonia gas absorption buffer tank 4, and the temperature remote indicator 16 is disposed on the ammonia gas absorption buffer tank 4; a fresh water switch valve 17 is provided on the fresh water delivery pipe connected to the ammonia absorption buffer tank 4.
Example 8
The embodiment is a safety automatic control method of a security and stability maintenance device of an acid water storage tank, which comprises the following steps:
s1, if the safety protection and stability 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 the ammonia absorption buffer automatic control system to operate;
if the safety protection and stability maintenance device of the acidic water storage tank is in an accident working condition state that the ammonia gas discharge 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 ammonia flow reaches a first threshold value, if not, automatically controlling the ammonia to enter the acid water settling tank 1 through flow linkage, closing ammonia absorption and ammonia water discharge in the ammonia absorption buffer tank 4, and realizing the unilateral operation of the ammonia absorption buffer automatic control system;
and if the flow of the ammonia reaches or is higher than the first threshold value and lower than the second threshold value, triggering flow automatic interlocking control to cut off the ammonia from entering the acid water settling tank 1, and simultaneously starting the ammonia entering and ammonia discharging in the ammonia absorption buffer tank 4 to realize the full operation of the ammonia absorption buffer automatic control system.
S3, the automatic control method of the ammonia absorption buffer safety automatic control system comprises the following steps: starting a safety automatic control chain in the full operation state of the ammonia absorption buffer automatic control system;
the safe self-control linkage starts fresh water in the ammonia absorption buffer tank 4, ammonia is started to enter the acidic water settling tank 1, the ammonia absorption buffer self-control system returns to normal when the flow of the ammonia is reduced to be below a second threshold value, and the safe self-control linkage closes the valve.
Further, the ammonia absorption buffer automatic control system operates on one side: the flow automatically controls the first ammonia switch valve 21 to be opened, the first ammonia switch valve 21 and the purified water flow control valve 11 to be closed in an interlocking manner, and the ammonia booster pump 5 is controlled to be stopped.
Further, the full operation of the ammonia absorption buffer automatic control system is as follows: triggering flow automatic interlocking control to cut off the first ammonia switch valve 21, simultaneously automatically interlocking flow to open an inlet switch valve of the ammonia absorption buffer tank 4 and the purified water flow control valve 11, and starting the ammonia booster pump 5 to operate. Further, the safe self-control interlocking starts the fresh water switch valve 17 to be opened in an interlocking manner, and controls the first ammonia switch valve 21 to be opened in an interlocking manner, so that fresh water enters the ammonia absorption buffer tank 4, and ammonia enters the acidic water settling tank 1.
Furthermore, when the ammonia absorption buffer automatic control system is in full operation, the opening of the purified water flow control valve 11 is adjusted in real time according to the first flow remote indication 10a in the ammonia flow indication, and the ratio of the ammonia water output to the purified water input is 1: 10-11 regulating the output of the ammonia water booster pump 5.
Further, the safety-autonomous interlock is activated by: the second flow telemetering indication 10b of 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 telemetering indication is to a temperature threshold.
The automatic control method of the ammonia absorption buffer automatic control system can not only ensure the safety and stability of the storage tank, but also realize the energy saving and water saving of the device.
During the in-service use, under the accident operating mode, especially ammonia discharge volume is high, purify water flow control valve 11 and become invalid, all can lead to ammonia to absorb the unable timely transfer of ammonia solution heat in buffer tank 4, and the heat accumulates rapidly, in case the temperature is higher than more than 90 ℃ in the absorption tank, a large amount of aqueous ammonia vaporization leads to the absorption tank super high temperature superpressure, and a large amount of ammonia breaks through the water seal, arranges to the atmosphere in, causes environmental pollution, can influence device production and personal safety even.
Through the control method of the ammonia absorption buffer safety automatic control system, when the ammonia emission is too high, the pressure transmitter 10 of the ammonia conveying pipe exceeds a second threshold value, or a large amount of heat is released during ammonia absorption to cause the ammonia absorption buffer tank 4 to be seriously overtemperature, or ammonia enters the absorption buffer tank in a large amount and exceeds a set pressure threshold value indicated by pressure far, and the safety automatic control interlocking control system is triggered to start. The safety automatic control interlocking system controls the fresh water switch valve 17 to be opened in an interlocking manner, fresh water quickly enters the ammonia absorption buffer tank 4 for rapid cooling, and simultaneously, the generation of a large amount of ammonia water vaporization is inhibited; meanwhile, the switch valve of the ammonia gas inlet of the acid water settling tank 1 is opened in a linkage manner, part of ammonia gas enters the acid water settling tank 1, the temperature of the ammonia gas absorption buffer tank 4 is slowed down, and the valve is closed in a linkage manner until the ammonia gas absorption system is recovered to be normal; effectively ensuring the safety and stability of the acidic water storage tank.
Example 9
A petrochemical company has an acid water storage tank system of an acid water stripping device of 60 tons/hour, the ammonia refining system of the device discharges a large amount of ammonia gas in daily operation, shutdown stages or emergent ammonia press faults and the like, the discharge amount is about 0-3000 kg/h, and the discharge amount of the ammonia gas is far beyond the daily maximum value of the ammonia gas received by the acid water storage tank;
the daily operation state is as follows: the pressure in the acid water settling 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 top of the acid water settling tank 1 and the top of the acid water buffer tank 2 are both provided with a nitrogen charging pressure control system. When the pressure of the pressure transmitters at the tops of the two acidic water tanks is lower than 320PaG, the nitrogen supplementing valve 6 of the settling tank and the nitrogen supplementing valve 8 of the buffer tank are opened, and when the pressure values of the pressure transmitter 7 of the top of the settling tank and the pressure transmitter 9 of the top of the buffer tank reach 500PaG, the nitrogen supplementing valve 6 of the settling tank and the nitrogen supplementing valve 8 of the buffer tank are closed.
The ammonia gas conveying main pipe is provided with a first ammonia gas flow indicator 10a for detecting the ammonia gas discharge displacement in real time. When the device normally operates, the ammonia emission is about 0-500 kg/h, the ammonia emission is less, and the stable operation of the storage tank cannot be influenced. At the moment, the flow automatically controls the opening of the purified water flow control valve 11 in an interlocking manner, the opening of a first ammonia gas inlet switch valve of the acid water settling tank 1 is kept, energy and water are saved, a second ammonia gas switch valve 22 of the ammonia gas absorption buffer tank 4 and the purified water flow control valve 11 are simultaneously closed, and the ammonia water booster pump 5 is stopped;
when device shut down stage or ammonia press trouble, the ammonia emission is about 500 ~ 2500kg/h ammonia emission great, this moment through the automatic chain control system of flow, cut off the first ammonia entry ooff valve 21 of acid water settling cask 1, open the second ammonia ooff valve 22 and the purification water flow control valve 11 of ammonia absorption buffer tank 4 simultaneously, 5 start-up operations of aqueous ammonia booster pump, indicate the ammonia flow of 10a through first flow teletransmission and instruct, adjust the aperture of purification water flow control valve 11 in real time, ensure that ammonia and purification water quality are than being 1: 10 to 11, and adjusting the frequency of the frequency converter 14 of the ammonia booster pump to ensure the ammonia delivery flow rate to match with the ammonia delivery flow rate.
The specific operation process is as follows: the ammonia gas is delivered from each emptying point in two paths through an ammonia gas delivery pipeline, one path is delivered to the acid water settling tank 1 through a first ammonia gas switch valve 21, and the other path is connected to the ammonia gas absorption buffer tank 4 through a second ammonia gas switch valve 22 and an opposite clamp type check valve 18. The ammonia gas entering the ammonia gas absorption buffer tank 4 is output through the ammonia gas distribution pipe 20, so that the ammonia gas is ensured to be uniformly distributed in water in a high-efficiency manner.
The purified water flow control valve 11 is normally opened and is connected to the purified water distribution pipe 19 in the spray tower section to supply water to the ammonia absorption buffer tank 4 in time. The 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, a liquid level transmitter 12 in the ammonia absorption buffer tank 4 detects the liquid level in the tank in real time, and adjusts the opening of an ammonia liquid control valve 13 in real time through liquid level signal feedback to keep the liquid level in the tank between 20% and 60%. Fresh water is switched on and off through a fresh water switch valve 17, and is discontinuously supplied to a corresponding inlet of the ammonia absorption buffer tank 4.
For avoiding accident condition, set up ammonia conveyer pipe flow teletransmission and instruct 10b, and set up "3 and get 2", timely feedback flow instruction the gas phase balance pipe at 4 tops of ammonia absorption buffer tank is provided with pressure transmitter 15, and pressure instruction sets up "3 and gets 2", and the 4 jar bodies of ammonia absorption buffer tank are equipped with temperature teletransmission and instruct 16, and temperature teletransmission instructs 16 to set up "3 and get 2".
When the accident condition occurs, such as the ammonia gas emission amount is 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 the ammonia gas emission amount is 2500-3000 kg/h, the safe self-control interlocking start can be triggered. Especially, when the ammonia gas discharge amount is up to 2500-3000 kg/h or the purified water flow control valve 11 is invalid, the ammonia gas dissolving heat in the ammonia gas absorption buffer tank 4 cannot be transferred in time, the heat is accumulated rapidly, once the temperature in the absorption tank is higher than 90 ℃, a large amount of ammonia water is vaporized, the absorption tank is caused to be over-temperature and over-pressure, a large amount of ammonia gas breaks through a water seal and is discharged into the atmosphere, the environment pollution is caused, and even the device production and the personal safety are influenced.
When an accident condition occurs, the safety automatic control interlocking system is started, the fresh water switch valve 17 is opened in an interlocking manner, fresh water quickly enters the ammonia absorption buffer tank 4 for rapid cooling, and the generation of a large amount of ammonia water vaporization is inhibited; meanwhile, the first ammonia switch valve 21 of the acid water settling tank 1 is opened in a linkage manner, ammonia enters the acid water settling tank 1, the temperature of the ammonia absorption buffer tank 4 is slowed down, and the safety automatic control linkage system is closed until the ammonia absorption buffer automatic control system is normal.
It should be noted that the above embodiments can be freely combined as required, and further description is omitted here for many other combinations. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a steady device is maintained in sour water storage tank security which characterized in that includes:
an acid water settling tank for receiving acid water and ammonia gas;
the acidic water buffer tank is communicated with the acidic water settling tank and is communicated with an external acidic 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 gas is arranged in the ammonia gas absorption buffer tank, and the purified water distribution pipe is communicated with a purified water conveying pipeline for conveying purified water of the acidic water stripping tower;
and the collecting pipe is used for collecting the acidic oil gas at the top of the acidic water settling tank and the acidic water buffer tank and transporting the residual ammonia gas in the ammonia gas absorption buffer tank to a tail gas treatment facility.
2. The acid water storage tank security and stability maintaining device of claim 1, wherein:
the ammonia absorption buffer tank is provided with a second ammonia switch valve and a wafer check valve for controlling the ammonia to enter; and/or the presence of a gas in the gas,
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 pipe is communicated with the acidic water settling tank;
the ammonia gas distribution pipe is symmetrically provided with two rows of exhaust holes, and the gas injection holes form an injection angle of 30-45 degrees;
the distance between the ammonia distribution pipe and the bottom of the ammonia absorption buffer tank is 150-300 mm.
3. The acid water storage tank security and stability maintaining device of claim 1, wherein:
two rows of water spray holes are symmetrically designed at two ends 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 spray holes is 1.2-1.5 times of the cross section area of the purified water distribution pipe.
4. The acid water storage tank security and stability maintaining device of claim 1, wherein:
a spray tower section is arranged on the ammonia absorption buffer tank, and a gas outlet at the top of the spray tower section is communicated with the collecting pipe through a gas phase balance pipe; and/or the presence of a gas in the gas,
and a wire mesh demister is arranged between the gas outlet at the top of the spray tower section and the purified water distribution pipe.
5. The acid water storage tank security and stability maintaining device of claim 1, wherein:
a liquid level transmitter for detecting the liquid level height is arranged on the ammonia absorption buffer tank;
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 presence of a gas in the gas,
and the ammonia absorption buffer tank is also provided with a fresh water conveying pipe communicated with an external fresh water conveying device.
6. The acid water storage tank security and stability maintaining device of claim 1, wherein:
the collecting pipe is provided with a first gas outlet end and a second gas outlet end, the first gas outlet end is communicated with the safe water seal tank, and the second gas outlet end is communicated with a tail gas treatment facility;
the safe water seal tank is communicated with the acid water settling tank through an overflow pipe for overflowing sewage.
7. An instrument automatic control system for the safety and stability maintenance device of the acid water storage tank as claimed in any one of claims 1 to 6, characterized in that: the security and stability maintenance device also comprises an instrument automatic control system, wherein the instrument automatic control system comprises an ammonia absorption buffer automatic control system and an ammonia absorption buffer safety automatic control system;
the meter automatic control system comprises the following components:
the first flow remote transmission indication and the second flow remote transmission indication are used for detecting the discharge capacity of the released ammonia gas in real time;
the first ammonia switch valve is used for controlling ammonia to enter the acidic water settling tank;
the second ammonia switch 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 gas 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 exhaust amount of the residual ammonia gas 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;
a fresh water switch valve for controlling the fresh water to enter the ammonia absorption buffer tank;
the ammonia absorption buffer automatic control system comprises: the ammonia delivery pipe pressure transmitter, the first ammonia switch valve, the second ammonia switch valve, the purified water flow control valve, the ammonia water booster pump frequency converter and the purified water flow control valve are automatically controlled in an interlocking manner through flow;
the ammonia absorption buffering autonomous system is used for controlling the accident condition of the ammonia absorption buffering autonomous system, and the ammonia absorption buffering autonomous system comprises: be provided with "3 get 2" second flow teletransmission instruction, first ammonia ooff valve, second ammonia ooff valve, be provided with "3 get 2" pressure transmitter and be provided with "3 get 2" temperature teletransmission instruction, and be provided with "3 get 2" second flow teletransmission instruction, first ammonia ooff valve, second ammonia ooff valve, be provided with "3 get 2" pressure transmitter and be provided with "3 get 2" temperature teletransmission instruction all through safe automatic control interlocking control operation.
8. The meter control system according to claim 7, wherein:
the flow rate automatic linkage is triggered by the first flow rate remote transmission indication reaching a first flow rate threshold value; and/or the presence of a gas in the gas,
the flow automatic interlocking control mass ratio of the ammonia gas input quantity to the purified water input quantity in the ammonia gas absorption buffer tank is 1: 10 to 11.
9. The meter control system of claim 7, wherein the safety interlock is triggered to activate by any one of the second flow telemetric indication reaching a second flow threshold, a pressure indication of the pressure transmitter reaching a pressure threshold, or a temperature telemetric indication reaching a temperature threshold.
10. An ammonia absorption buffering automatic control method of a security and stability maintenance device of an acidic water storage tank is characterized by comprising the following steps:
s1, if the safety protection and stability 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 the ammonia absorption buffer automatic control system to operate;
if the safety protection and stability maintenance device of the acidic water storage tank is in an accident working condition state that the ammonia gas discharge 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 ammonia flow reaches a first threshold value, if not, automatically controlling the ammonia to enter an acid water settling tank through flow linkage, closing ammonia absorption and ammonia water discharge in an ammonia absorption buffer tank, and realizing the unilateral operation of the ammonia absorption buffer automatic control system;
if the flow of the ammonia reaches or is higher than a first threshold value and lower than a second threshold value, triggering flow automatic interlocking control to cut off the ammonia from entering the acid water settling tank, and simultaneously starting the ammonia entering and ammonia discharging in the ammonia absorption buffer tank to realize the full operation of the ammonia absorption buffer automatic control system;
s3, the automatic control method of the ammonia absorption buffer safety automatic control system comprises the following steps: starting a safety automatic control chain in the full operation state of the ammonia absorption buffer automatic control system;
and the safety automatic control linkage starts fresh water of the ammonia absorption buffer tank to enter, and opens ammonia to enter the acidic water settling tank until the flow of the ammonia is reduced to be below a second threshold value, the ammonia absorption buffer automatic control system recovers to be normal, and the safety automatic control linkage closes the valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911056004.0A CN110665339B (en) | 2019-10-31 | 2019-10-31 | Security maintenance device for acidic water storage tank and security automatic control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911056004.0A CN110665339B (en) | 2019-10-31 | 2019-10-31 | Security maintenance device for acidic water storage tank and security automatic control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110665339A true CN110665339A (en) | 2020-01-10 |
| CN110665339B CN110665339B (en) | 2023-08-04 |
Family
ID=69085471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911056004.0A Active CN110665339B (en) | 2019-10-31 | 2019-10-31 | Security maintenance device for acidic water storage tank and security automatic control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110665339B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09313880A (en) * | 1996-05-30 | 1997-12-09 | Mitsubishi Heavy Ind Ltd | Flue gas desulfurizing treatment and device therefor |
| US20030075050A1 (en) * | 2001-09-28 | 2003-04-24 | Masahiro Kato | Carbon dioxide gas absorbent and carbon dioxide gas separating apparatus |
| CN102009808A (en) * | 2010-10-19 | 2011-04-13 | 河南心连心化肥有限公司 | Ammonia storage tank emptying gas absorption equipment |
| CN202061525U (en) * | 2011-04-18 | 2011-12-07 | 中国水利水电科学研究院 | Ammonia gas reclaiming device |
| CN102389700A (en) * | 2011-10-11 | 2012-03-28 | 中国药科大学 | Low-emission waste gas treatment process |
| CN203842474U (en) * | 2014-04-16 | 2014-09-24 | 深圳泽峰环保技术有限公司 | Small-size ammonia gas absorption device |
| CN207287074U (en) * | 2017-10-12 | 2018-05-01 | 中国神华能源股份有限公司 | It is highly soluble in the absorption system of the exhaust gas of water |
| CN208003713U (en) * | 2018-02-08 | 2018-10-26 | 上海泰誉节能环保科技有限公司 | A kind of super-hydrophobic ceramic membrane pressurization denitrating system |
| CN208340476U (en) * | 2018-03-23 | 2019-01-08 | 长岭炼化岳阳工程设计有限公司 | Acid water tank field VOC emission reduction device |
| CN209053667U (en) * | 2018-11-06 | 2019-07-02 | 长春一汽四环腾达油脂化工有限公司 | A kind of automatically controlled ejection system of ammonia |
| CN209204982U (en) * | 2018-10-12 | 2019-08-06 | 云南净世环保科技有限公司 | Mobile A leak of liquefied ammonia processing unit |
| CN211537146U (en) * | 2019-10-31 | 2020-09-22 | 上海蓝科石化环保科技股份有限公司 | Steady device of acid water storage tank security protection dimension |
-
2019
- 2019-10-31 CN CN201911056004.0A patent/CN110665339B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09313880A (en) * | 1996-05-30 | 1997-12-09 | Mitsubishi Heavy Ind Ltd | Flue gas desulfurizing treatment and device therefor |
| US20030075050A1 (en) * | 2001-09-28 | 2003-04-24 | Masahiro Kato | Carbon dioxide gas absorbent and carbon dioxide gas separating apparatus |
| CN102009808A (en) * | 2010-10-19 | 2011-04-13 | 河南心连心化肥有限公司 | Ammonia storage tank emptying gas absorption equipment |
| CN202061525U (en) * | 2011-04-18 | 2011-12-07 | 中国水利水电科学研究院 | Ammonia gas reclaiming device |
| CN102389700A (en) * | 2011-10-11 | 2012-03-28 | 中国药科大学 | Low-emission waste gas treatment process |
| CN203842474U (en) * | 2014-04-16 | 2014-09-24 | 深圳泽峰环保技术有限公司 | Small-size ammonia gas absorption device |
| CN207287074U (en) * | 2017-10-12 | 2018-05-01 | 中国神华能源股份有限公司 | It is highly soluble in the absorption system of the exhaust gas of water |
| CN208003713U (en) * | 2018-02-08 | 2018-10-26 | 上海泰誉节能环保科技有限公司 | A kind of super-hydrophobic ceramic membrane pressurization denitrating system |
| CN208340476U (en) * | 2018-03-23 | 2019-01-08 | 长岭炼化岳阳工程设计有限公司 | Acid water tank field VOC emission reduction device |
| CN209204982U (en) * | 2018-10-12 | 2019-08-06 | 云南净世环保科技有限公司 | Mobile A leak of liquefied ammonia processing unit |
| CN209053667U (en) * | 2018-11-06 | 2019-07-02 | 长春一汽四环腾达油脂化工有限公司 | A kind of automatically controlled ejection system of ammonia |
| CN211537146U (en) * | 2019-10-31 | 2020-09-22 | 上海蓝科石化环保科技股份有限公司 | Steady device of acid water storage tank security protection dimension |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110665339B (en) | 2023-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114320686B (en) | Marine methanol fuel supply method | |
| CN108592054A (en) | A kind of coke-oven plant VOCs processing systems | |
| CN211537146U (en) | Steady device of acid water storage tank security protection dimension | |
| CN104096379A (en) | High-sulfur crude oil gas recovery system for docks | |
| CN216998308U (en) | Sulfur recovery system for natural gas desulfurization acid gas | |
| CN110665339A (en) | Security and stability maintenance device for acidic water storage tank and safety automatic control method thereof | |
| CN203916132U (en) | A kind of harbour sour crude oil gas recovery processing system | |
| CN201712998U (en) | Storage tank capable of transmitting pressure | |
| CN215627819U (en) | Logging test gas desulphurization device | |
| CN209411771U (en) | The hydrogen purification and carbon dioxide recovery of hydrogen production by methanol system utilize device | |
| CN103157376A (en) | SNCR and SCR (Selective Non-catalytic Reduction and Selective Catalytic Reduction) combined reducing agent storage and preparation system | |
| CN104864765B (en) | Vacuum water feeding system of cooling tower | |
| CN105107360A (en) | Emergency drain-off system for thermal power plant denitration system ammonia area liquid ammonia | |
| CN214571753U (en) | Methanol underground tank protection system | |
| CN210584343U (en) | Exhaust gas purification device | |
| CN203990299U (en) | Gas protection desulfurizer | |
| CN214618009U (en) | Methane liquid sealing-dewatering integrated device | |
| CN110357053A (en) | A kind of helium production system | |
| CN212142051U (en) | Hydrochloric acid recovery device | |
| CN101480563B (en) | Desulfuration method and equipment with dilute sulphuric acid-ammonia process | |
| CN220779647U (en) | Polypropylene SPG production tail gas recovery device | |
| CN108224829B (en) | Liquid ammonia delivery system and liquid ammonia delivery method | |
| CN210934073U (en) | Gasification system of air hammer | |
| CN219922105U (en) | Raw material alcohol feeding, exhausting and raw material recycling device | |
| CN212799639U (en) | A water stable system for sulphuric acid production |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |