CN115228254A - Desulfurization analysis system and switching method thereof - Google Patents
Desulfurization analysis system and switching method thereof Download PDFInfo
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- CN115228254A CN115228254A CN202210819697.XA CN202210819697A CN115228254A CN 115228254 A CN115228254 A CN 115228254A CN 202210819697 A CN202210819697 A CN 202210819697A CN 115228254 A CN115228254 A CN 115228254A
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 95
- 230000023556 desulfurization Effects 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000002253 acid Substances 0.000 claims abstract description 183
- 238000002360 preparation method Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims description 94
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 75
- 238000003795 desorption Methods 0.000 claims description 61
- 238000011010 flushing procedure Methods 0.000 claims description 34
- 238000004891 communication Methods 0.000 claims description 20
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 6
- 239000000110 cooling liquid Substances 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 109
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 15
- 230000008569 process Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 229910001873 dinitrogen Inorganic materials 0.000 description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 239000000571 coke Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
-
- 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
- B01D53/30—Controlling by gas-analysis apparatus
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- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to the technical field of desulfurization and discloses a desulfurization analysis system and a switching method thereof. The acid gas treatment unit comprises an acid gas condenser, an acid gas cooler and an acid gas separator which are connected in sequence, the acid gas condenser is connected with the acid analysis tower, the acid gas separator is connected to the acid making system, and an acid valve is arranged between the acid gas separator and the acid making system; the standby acid gas treatment unit comprises a standby acid gas condenser, a standby acid gas cooler and a standby acid gas separator which are sequentially connected, the standby acid gas condenser is connected with the standby analysis tower, the standby acid gas separator is connected to the acid preparation system, and a standby acid preparation valve is arranged between the standby acid gas separator and the acid preparation system; the communicating unit comprises a communicating pipe, a communicating valve and a flow rate meter, the flow rate meter and the communicating valve are both arranged on the communicating pipe, one end of the communicating pipe is connected between the standby acid-gas separator and the acid making system, and the other end of the communicating pipe is connected between the active acid-gas separator and the acid making system.
Description
Technical Field
The invention relates to the technical field of desulfurization, in particular to a desulfurization analysis system and a switching method thereof.
Background
In the production of coke oven gas, the coke oven gas produced may contain other impurities, such as sulfur-containing acid gas, so that the coke oven gas is desulfurized and purified before being supplied to the subsequent process.
The existing desulfurization treatment of coke oven gas generally needs to be carried out after ammonium sulfate process, final cooling process, benzene washing process, water washing process and desulfurization process, when the gas after the benzene washing process passes through a water washing tower of the water washing process, most of oil impurities in the gas are washed and then enter the desulfurization process, in the desulfurization tower, a circulating desulfurization solution absorbs sulfur-containing acidic gas (such as hydrogen sulfide) to form a circulating desulfurization rich solution, the circulating desulfurization rich solution separates the sulfur-containing acidic gas into a circulating desulfurization barren solution in an analytical tower, the circulating desulfurization barren solution returns to the desulfurization process for use, the sulfur-containing acidic gas separated in the analytical tower is treated by an acid gas condenser, an acid gas separator and an acid gas separator to realize gas-liquid separation, wherein cooling liquid is collected into an underground tank, and the residual acid gas enters an acid making process for further treatment.
In the existing gas purification system, two sets of desulfurization analysis systems are often provided for long-term stable production operation, wherein one set is used, and the other set is reserved. After the operation reaches a certain period, the desulfurization analysis system in use needs to be overhauled and maintained, so the desulfurization analysis system in use needs to be switched to a standby desulfurization analysis system.
Before switching, the internal pressure of the used analysis tower is about-80 KPa, the standby tower is in a micro-positive pressure state, when a valve of an acid gas pipe of the standby tower for removing a vacuum pump is opened, a large amount of protective gas in the standby tower instantly flows to the vacuum pump and the used analysis tower, so that the internal pressure of the standby tower is rapidly reduced, the internal and external pressure difference of the standby tower is rapidly increased, the pressure of the standby tower is rapidly increased, the analysis effect of the standby tower on the acid gas is influenced, and the analysis effect of the standby tower is also influenced; on the other hand, a large amount of gas is pumped away by the vacuum pump, so that the pressure behind the vacuum pump is raised instantaneously, the normal operation of the acid making process can be directly influenced, and even the vacuum pump is caused to jump over and stop, so that the environmental protection accident is caused.
Disclosure of Invention
An object of the present invention is to provide a desulfurization desorption system which prevents a rapid pressure difference from being formed in a desulfurization desorption tower and has a good desorption effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a desulfurization resolving system comprising:
the system comprises an active desulfurization resolving system and an active acid gas treatment unit, wherein the active rich solution resolving unit comprises an active resolving tower, the active acid gas treatment unit comprises an active acid gas condenser, an active acid gas cooler and an active acid gas separator which are sequentially connected, the active acid gas condenser is connected with the active resolving tower, the active acid gas separator is connected with an acid making system, and an active acid making valve is arranged between the active acid gas separator and the acid making system;
the standby desulphurization analysis system comprises a standby pregnant solution analysis unit and a standby acid gas treatment unit, wherein the standby pregnant solution analysis unit comprises a standby analysis tower, the standby acid gas treatment unit comprises a standby acid gas condenser, a standby acid gas cooler and a standby acid gas separator which are sequentially connected, the standby acid gas condenser is connected with the standby analysis tower, the standby acid gas separator is configured to be connected to the acid preparation system, and a standby acid preparation valve is arranged between the standby acid gas separator and the acid preparation system;
and the communicating unit comprises a communicating pipe, a communicating valve and a flow meter, the flow meter and the communicating valve are arranged on the communicating pipe, one end of the communicating pipe is connected between the standby acid-gas separator and the acid making system, and the other end of the communicating pipe is connected between the in-use acid-gas separator and the acid making system.
Optionally, the desulfurization analysis system further comprises a flushing unit, the flushing unit comprises a liquid supply device, a first flushing pipe and a second flushing pipe, the first flushing pipe and the second flushing pipe are connected to the liquid supply device, one end, far away from the liquid supply device, of the first flushing pipe is connected with the analysis tower in use, and one end, far away from the liquid supply device, of the second flushing pipe is connected with the standby analysis tower.
Another object of the present invention is to provide a method for switching a desulfurization desorption system, which prevents a rapid pressure difference from being formed in a desulfurization desorption tower and has a good desorption effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a desulfurization analysis system switching method is applied to the desulfurization analysis system, in the desulfurization analysis system,
the in-use desorption tower is configured to be connected with a rich liquid input pipe, and an in-use rich liquid valve is arranged between the in-use desorption tower and the rich liquid input pipe; the in-use desorption tower is also configured to be connected with a desulfurization system, and an in-use lean liquor valve is arranged between the in-use desorption tower and the desulfurization system;
the standby desorption tower is configured to be connected with the rich liquid input pipe, and a standby rich liquid valve is arranged between the standby desorption tower and the rich liquid input pipe; the standby desorption tower is also configured to be connected with the desulfurization system, and a standby barren liquor valve is arranged between the standby desorption tower and the desulfurization system;
the in-use rich solution desorption unit also comprises an in-use hot water reboiler and an in-use steam reboiler, and the in-use hot water reboiler and the in-use steam reboiler are both connected to the in-use desorption tower;
the standby rich liquid desorption unit also comprises a standby hot water reboiler and a standby steam reboiler, and the standby hot water reboiler and the standby steam reboiler are both connected to the standby desorption tower;
the desulfurization analysis system switching method comprises the following steps:
s1, opening the communication valve, and adjusting the opening of the communication valve to enable the monitoring value of the flow meter to be equal to a first flow rate;
s2, keeping the first time until the first flow rate is reduced and is smaller than the second flow rate;
s3, opening the standby acid preparation valve;
s4, opening the standby steam reboiler;
s5, closing the in-use rich liquid valve and fully opening the standby rich liquid valve;
s6, opening the standby hot water reboiler, and closing the in-use hot water reboiler;
s7, closing the in-use steam reboiler;
s8, opening the standby lean liquid valve and closing the in-use lean liquid valve;
s9, opening the standby acid gas condenser, and closing the active acid gas condenser;
s10, opening the standby acid gas cooler, and closing the active acid gas cooler;
s11, closing the acid making valve in use.
Alternatively, the first and second liquid crystal display panels may be,
before step S1, further comprising: s12, opening a circulating condensate inlet valve of the standby acid gas condenser, and filling the standby acid gas condenser; opening a circulating cooling liquid inlet valve of the standby acid gas cooler to fill the standby acid gas cooler;
in step S9, opening the backup acid gas condenser comprises opening a cycle condensate outlet valve of the backup acid gas condenser;
in step S10, opening the backup sour gas cooler comprises opening a circulating coolant outlet valve of the backup sour gas cooler.
Optionally, before step S12, the method further includes: s13, reducing the opening degree of the in-use rich liquid valve to be half of the full opening degree, opening the standby rich liquid valve, and closing the standby rich liquid valve when the liquid level in the standby analysis tower reaches the first liquid level value.
Optionally, before step S13, the method further includes: s14, flushing the standby analytical tower.
Alternatively,
before step S1, further comprising: s15, opening a circulating water inlet valve of the standby hot water reboiler, and filling the standby hot water reboiler;
in step S6, opening the standby hot water reboiler includes: and fully opening a circulating water inlet valve and a circulating water outlet valve of the standby hot water reboiler.
Optionally, step S15 further includes: and opening the circulating water outlet valve to ensure that the opening degree of the circulating water outlet valve is not greater than the first opening degree.
Optionally, the standby steam reboiler is provided with a steam inlet valve and a steam outlet valve, and the opening the standby steam reboiler in step S4 includes:
s41, opening the steam inlet valve to keep a second opening degree;
s42, keeping for a second time;
s43, opening the steam outlet valve;
and S44, gradually increasing the opening degree of the steam inlet valve until the standard steam flow rate is reached.
Optionally, when step S8 is executed, the liquid level of the in-use desorption tower needs to be lower than the second liquid level value.
Has the advantages that:
the invention provides a desulfurization analysis system and a switching method thereof, which take the case of switching an existing desulfurization analysis system into a standby desulfurization analysis system, wherein before a standby acid preparation valve is opened, a communicating valve is opened, the opening degree of the communicating valve is controlled according to a flow rate meter, protective nitrogen filled in a standby analysis tower passes through a communicating pipe at a low flow rate, and flows to the acid preparation system from a position between an acid gas separator and the acid preparation system, the communicating valve and the flow rate meter are convenient for controlling the outflow speed and the outflow flow rate of the protective nitrogen in the standby analysis tower, and when the protective nitrogen flows out at a low speed, the phenomenon that the structure of the standby analysis tower is influenced by the pressure difference which changes sharply inside and outside the standby analysis tower can be avoided, and the analysis effect is finally reduced. Meanwhile, the vacuum pump between the acid making system and the acid-gas separator is protected, and the phenomenon that the vacuum pump is stopped due to overcurrent is avoided, so that accidents are avoided. The standby analysis tower is connected with the in-use analysis tower through the communicating pipe, so that the air pressure of the standby analysis tower gradually approaches the air pressure of the in-use analysis tower along with the outflow of the protective nitrogen, and when the air pressures of the standby analysis tower and the in-use analysis tower are close to each other, the standby acid preparation valve is opened, and the communicating valve is closed, so that the standby acid gas separator and the acid preparation system enter a pre-working state.
Drawings
FIG. 1 is a schematic structural diagram of a desulfurization resolving system provided in an embodiment of the present invention;
FIG. 2 is a flow chart of a switching method of the desulfurization analysis system according to the embodiment of the present invention;
fig. 3 is another flowchart of a switching method of a desulfurization analysis system according to an embodiment of the present invention.
In the figure:
100. an acid making system; 101. a desulfurization system; 102. a rich liquid input pipe;
1. an in-use desulfurization resolution system; 11. a rich solution analysis unit; 111. an in-use desorption tower; 112. in a hot water reboiler; 113. in a steam reboiler; 114. a rich liquid valve is used; 115. an in-use lean solution valve; 12. in the acid gas treatment unit; 121. in an acid gas condenser; 122. cooling with acid gas; 123. an acid gas separator is used; 124. an acid making valve is used;
2. a standby desulfurization analysis system; 21. a spare pregnant solution analyzing unit; 211. a standby desorption tower; 212. a standby hot water reboiler; 2121. a circulating water inlet valve; 2122. a circulating water outlet valve; 213. a standby steam reboiler; 2131. a steam inlet valve; 2132. a vapor outlet valve; 214. a reserve rich liquid valve; 215. a reserve lean liquor valve; 22. a standby acid gas treatment unit; 221. a spare acid gas condenser; 222. a standby acid gas cooler; 223. a standby acid-gas separator; 224. preparing an acid preparation valve;
31. a first flush tube; 32. a second flush tube;
4. a communication unit; 41. a communicating pipe; 42. a communication valve;
5. a hot water supply unit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.
Example one
As shown in fig. 1, the present example provides a desulfurization analysis system that can avoid a sharp pressure difference between the standby analysis column 211 and the active analysis column 111 during switching therebetween, and that has a good analysis effect. The desulfurization analysis system according to the present embodiment includes an in-use desulfurization analysis system 1, a backup desulfurization analysis system 2, and a communication unit 4.
The in-use desulfurization resolving system 1 comprises an in-use rich solution resolving unit 11 and an in-use acid gas treatment unit 12, the in-use rich solution resolving unit 11 comprises an in-use resolving tower 111, the in-use acid gas treatment unit 12 comprises an in-use acid gas condenser 121, an in-use acid gas cooler 122 and an in-use acid gas separator 123 which are sequentially connected, the in-use acid gas condenser 121 is connected with the in-use resolving tower 111 to receive acid gas generated in a resolving process, the in-use acid gas separator 123 is connected to the acid making system 100 to convey separated acid gas to the acid making system 100, and an in-use acid making valve 124 is arranged between the in-use acid gas separator 123 and the acid making system 100.
The standby desulfurization analysis system 2 comprises a standby rich liquid analysis unit 21 and a standby acid gas treatment unit 22, wherein the standby rich liquid analysis unit 21 comprises a standby analysis tower 211, the standby acid gas treatment unit 22 comprises a standby acid gas condenser 221, a standby acid gas cooler 222 and a standby acid gas separator 223 which are sequentially connected, and the standby acid gas condenser 221 is connected with the standby analysis tower 211 to receive acid gas generated in the analysis process; the backup acid gas separator 223 is configured to be connected to the acid making system 100 to deliver the separated acid gas to the acid making system 100, and a backup acid making valve 224 is provided between the backup acid gas separator 223 and the acid making system 100.
The communication unit 4 includes a communication pipe 41, a communication valve 42, and a flow rate meter, both of which are provided on the communication pipe 41, and one end of the communication pipe 41 is connected between the standby acid-gas separator 223 and the acid making system 100, and the other end is connected between the in-use acid-gas separator 123 and the acid making system 100.
Taking the example of switching the existing desulfurization analysis system 1 to the standby desulfurization analysis system 2, before opening the standby acid production valve 224, the communication valve 42 is opened, the opening degree of the communication valve 42 is controlled by the flow rate meter, the guard nitrogen gas filled in the standby analysis tower 211 flows from between the acid gas separator 123 and the acid production system 100 to the acid production system 100 through the communication pipe 41 at a low flow rate, the communication valve 42 and the flow rate meter facilitate control of the outflow rate and outflow flow rate of the guard nitrogen gas in the standby analysis tower 211, and when the guard nitrogen gas flows out at a low speed, it is possible to avoid a rapidly changing pressure difference between the inside and the outside of the standby analysis tower 211 from affecting the structure of the standby analysis tower 211, and finally reduce the analysis effect. Meanwhile, the vacuum pump between the acid making system 100 and the acid-gas separator 123 is protected, and accidents caused by the fact that the vacuum pump is stopped due to overcurrent are avoided. Since the standby analysis tower 211 is connected to the active analysis tower 111 through the connection pipe 41, the gas pressure of the standby analysis tower 211 gradually approaches the gas pressure of the active analysis tower 111 as the shielding nitrogen gas flows out, and when the gas pressures are close to each other, the standby acid production valve 224 is opened and the connection valve 42 is closed, so that the standby acid gas separator 223 and the acid production system 100 are brought into a pre-operation state. In this embodiment, the nominal diameter of the communication pipe 41 is 25mm, and the pipe diameter is small, so that the flow rate can be controlled conveniently, and the pressure difference borne by the standby analytical tower 211 is prevented from being too large.
Optionally, the desulfurization analysis system further comprises a flushing unit, the flushing unit comprises a liquid supply device, a first flushing pipe 31 and a second flushing pipe 32, the first flushing pipe 31 and the second flushing pipe 32 are both connected to the liquid supply device, one end of the first flushing pipe 31, which is far away from the liquid supply device, is connected to the analysis tower 111 in use, and one end of the second flushing pipe 32, which is far away from the liquid supply device, is connected to the standby analysis tower 211. Before the standby analytical tower 211 or the used analytical tower 111 is used, the cleaning unit is used for cleaning the standby analytical tower 211 or the used analytical tower 111, so that the inside of the standby analytical tower is kept clean and free of impurities, and the desulfurization analysis effect is improved. The liquid supply device in this embodiment is the prior art, and is not described herein again. In order to facilitate the actuation of the first and second flushing pipes 31, 32, a first flushing valve can be mounted on the first flushing pipe 31 and a second flushing valve can be mounted on the second flushing pipe 32.
Example two
The present embodiment further provides a method for switching a desulfurization analysis system, which is applied to the desulfurization analysis system provided in the first embodiment, and can avoid a sharp pressure difference between the standby desulfurization analysis system 2 and the in-use desulfurization analysis system 1 during switching therebetween, so that the analysis effect is good.
As shown in fig. 1, in the desulfurization desorption system described above, the desorption tower 111 is configured to be connected to the rich liquid input pipe 102 to receive the rich liquid from the rich liquid input pipe 102; an in-use rich liquid valve 114 is arranged between the in-use desorption tower 111 and the rich liquid input pipe 102 and is used for controlling the conduction or the blockage between the rich liquid input pipe 102 and the in-use desorption tower 111; when the used analysis tower 111 is used, the used rich liquid valve 114 is opened to allow the rich liquid to smoothly flow into the used analysis tower 111 from the rich liquid input pipe 102, and when the spare analysis tower 211 is used, the used rich liquid valve 114 is closed to block the rich liquid input pipe 102 from the used analysis tower 111.
Similarly, backup desorber 211 is configured to be coupled to rich liquid input 102 to receive rich liquid from rich liquid input 102; a backup rich liquid valve 214 is provided between the backup separation tower 211 and the rich liquid inlet pipe 102, and is used to control the conduction or blocking between the rich liquid inlet pipe 102 and the backup separation tower 211.
In the above desulfurization resolving system, the resolving tower 111 is further configured to be connected to the desulfurization system 101 to convey the resolved formed lean solution to the desulfurization system 101; an active lean solution valve 115 is arranged between the active desorption tower 111 and the desulfurization system 101 and used for controlling the conduction or the blockage between the active desorption tower 111 and the desulfurization system 101; when the analysis tower 111 is in use, the lean solution valve 115 is opened to smoothly feed the lean solution generated in the analysis tower 111 to the desulfurization system 101, and when the standby analysis tower 211 is in use, the lean solution valve 115 is closed to block the communication between the analysis tower 111 and the desulfurization system 101.
Similarly, the backup resolving tower 211 is also configured to be connected to the desulfurization system 101 to deliver the resolved formed lean solution to the desulfurization system 101, and a backup lean solution valve 215 is disposed between the backup resolving tower 211 and the desulfurization system 101 to control the conduction or blocking between the backup resolving tower 211 and the desulfurization system 101.
In the above-described desulfurization analysis system, the rich liquid analyzing unit 11 further includes a hot water reboiler 112 and a steam reboiler 113, both the hot water reboiler 112 and the steam reboiler 113 are connected to the desorption tower 111, the hot water reboiler 112 supplies hot water to the desorption tower 111, and the steam reboiler 113 supplies steam to the desorption tower 111.
Similarly, the standby rich liquid stripping unit 21 further includes a standby hot water reboiler 212 and a standby steam reboiler 213, the standby hot water reboiler 212 and the standby steam reboiler 213 are both connected to the standby stripping tower 211, the standby hot water reboiler 212 is used for supplying hot water to the standby stripping tower 211, and the standby steam reboiler 213 is used for supplying steam to the standby stripping tower 211.
In this embodiment, the desulfurization resolving system further comprises a hot water supply unit 5, and the inlet end of the used hot water reboiler 112 and the inlet end of the standby hot water reboiler 212 are both connected to the outlet end of the hot water supply unit 5; the outlet end of the used hot water reboiler 112 and the outlet end of the standby hot water reboiler 212 are connected to the inlet end of the hot water supply unit 5. That is, the hot water supply unit 5 serves to circulate the produced water for the standby hot water reboiler 212 and the active hot water reboiler 112.
As shown in fig. 2, the method for switching the desulfurization analysis system according to the present embodiment includes the following steps:
s1, opening the communication valve 42, and adjusting the opening of the communication valve 42 to enable the monitoring value of the flow meter to be equal to the first flow rate.
In this embodiment, the first flow rate is controlled so that the pressure inside the standby analyzer tower 211 is decreased at a rate of 10KPa/h, and the pressure inside the standby analyzer tower 211 is decreased slowly, thereby preventing the pressure inside the standby analyzer tower 211 from changing sharply and causing the standby analyzer tower 211 to receive an excessive pressure difference. Illustratively, the first flow rate is 1m/min.
And S2, keeping the first time until the first flow rate is reduced and is smaller than the second flow rate. As the guard nitrogen gas in the backup analyzer tower 211 gradually flows from the connection pipe 41 to the desulfurization system 101, the guard nitrogen gas in the backup analyzer tower 211 gradually decreases, and when it is found that the flow rate monitored by the flow rate meter decreases from the first flow rate, it means that the difference between the pressure of the guard nitrogen gas in the backup analyzer tower 211 and the pressure in the active analyzer tower 111 becomes smaller, and the first flow rate cannot be established, and when the first flow rate decreases to the second flow rate, the pressure in the backup analyzer tower 211 approaches the pressure in the active analyzer tower 111, and the pre-production state can be entered. Illustratively, the first time is 8h and the second flow rate is 0.02m/min.
S3, opening the standby acid preparation valve 224. When the gas pressure in the standby desorption tower 211 is approximately equal to the gas pressure in the active desorption tower 111, the standby acid production valve 224 is opened, and the operation of the vacuum pump between the standby desorption tower and the desulfurization system 101 is not affected.
S4, opening a standby steam reboiler 213.
In this embodiment, the steam inlet valve 2131 and the steam outlet valve 2132 are provided on the standby steam reboiler 213, and the opening of the standby steam reboiler 213 in step S4 includes:
s41, opening the steam inlet valve 2131 to enable the steam inlet valve to keep a second opening degree; in the present embodiment, the second opening degree is less than one fifth of the full opening degree thereof.
And S42, keeping the temperature for the second time, so as to discharge the condensate in the standby steam reboiler 213, and keeping the quality of the steam supplied to the standby desorption tower 211 by the standby steam reboiler 213 stable, thereby improving the desorption effect.
S43, opening the steam outlet valve 2132.
S44, gradually increasing the opening of the steam inlet valve 2131 until the standard steam flow rate is reached, thereby providing sufficient and qualified steam for the standby stripping column 211.
S5, the active rich liquid valve 114 is closed, and the standby rich liquid valve 214 is fully opened.
S6, the standby hot water reboiler 212 is opened, and the active hot water reboiler 112 is closed.
S7, the steam reboiler 113 for use is closed.
S8, opening a standby lean liquid valve 215 and closing an active lean liquid valve 115; in this embodiment, when step S8 is performed, the liquid level in the desorption tower 111 should be lower than the second liquid level value. Illustratively, the second level value is 100mm.
And S9, opening the standby acid gas condenser 221 and closing the active acid gas condenser 121.
S10, the standby acid gas cooler 222 is opened, and the active acid gas cooler 122 is closed.
S11, the in-use acid-making valve 124 is closed, and the in-use desulfurization analysis system 1 and the standby desulfurization analysis system 2 are switched.
As shown in fig. 3, optionally, before step S1, further comprising: s12, opening a circulating condensate inlet valve of the standby acid gas condenser 221, and filling the standby acid gas condenser 221 with the circulating condensate inlet valve; the circulating cooling fluid inlet valve of the backup sour gas cooler 222 is opened and the backup sour gas cooler 222 is filled. That is, before the standby desorption tower 211 is connected to the rich liquid input pipe 102, the cooling liquids of the standby acid gas condenser 221 and the standby acid gas cooler 222 are filled, so that when the standby desorption tower 211 is put into use, the standby acid gas condenser 221 and the standby acid gas cooler 222 can perform a corresponding cooling function to cool the acid gas generated by the standby desorption tower 211. In step S9, opening the backup acid gas condenser 221 includes opening a cycle condensate outlet valve of the backup acid gas condenser 221; that is, after the standby desorption tower 211 is put into use, the circulation of the condensate in the acid gas condenser is started to continuously cool the acid gas generated in the standby desorption tower 211. In step S10, opening the backup sour gas cooler 222 includes opening a circulating coolant outlet valve of the backup sour gas cooler 222. That is, after the standby desorption tower 211 is put into use, the circulation of the cooling liquid in the acid gas cooler is started to continuously cool the acid gas generated in the standby desorption tower 211.
As shown in fig. 3, optionally, before step S1, further comprising: s15, opening a circulating water inlet valve 2121 of the standby hot water reboiler 212, and filling the standby hot water reboiler 212; in step S6, turning on the standby hot water reboiler 212 includes: a circulating water inlet valve 2121 and a circulating water outlet valve 2122 of the fully opened standby hot water reboiler 212.
That is, before the standby desorption tower 211 is connected to the rich liquid inlet pipe 102, the circulating water inlet valve 2121 is opened to fill the standby hot water reboiler 212, so that the standby hot water reboiler 212 can function to supply hot water immediately after the standby desorption tower 211 is put into use. Optionally, step S15 further includes: the circulating water outlet valve 2122 is opened so that the opening degree thereof is not more than the first opening degree. When the standby hot water reboiler 212 is filled, in order to avoid the standby hot water reboiler 212 from being held down, the circulating water outlet valve 2122 may be opened, and the opening degree thereof is smaller than the first opening degree, which is the opening degree of the circulating water inlet valve 2121 in this application.
As shown in fig. 3, optionally, before step S12, the method further includes: and S13, reducing the opening degree of the in-use rich liquid valve 114 to half of the full opening degree, opening the standby rich liquid valve 214, and closing the standby rich liquid valve 214 when the liquid level in the standby analysis tower 211 reaches the first liquid level value. That is, before the standby acid gas condenser 221 and the standby acid gas cooler 222 are started, a certain amount of rich liquid is stored in the standby desorption tower 211 to fill the pipelines and cavities inside the standby desorption tower; after the standby acid gas condenser 221 and the standby acid gas cooler 222 are filled, the standby rich liquid valve 214 is fully opened, the flow of the rich liquid in the standby desorption tower 211 can be continuously kept stable, and the stability of the desorption process is ensured without the interval of an empty pipeline or a cavity.
As shown in fig. 3, optionally, before step S13, the method further includes: s14, flushing the standby analytical tower 211. Specifically, before switching the active analysis tower 111 to the standby analysis tower 211, the standby analysis tower 211 is flushed by the flushing unit. In this embodiment, the cleaning agent in the liquid supply device can be injected into the standby analytical tower 211 by opening the second flushing valve, and the standby analytical tower 211 is flushed.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations, and substitutions will occur to those skilled in the art without departing from the scope of the present invention. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A desulfurization resolving system, comprising:
the in-use desulfurization resolving system (1) comprises an in-use rich solution resolving unit (11) and an in-use acid gas treatment unit (12), wherein the in-use rich solution resolving unit (11) comprises an in-use resolving tower (111), the in-use acid gas treatment unit (12) comprises an in-use acid gas condenser (121), an in-use acid gas cooler (122) and an in-use acid gas separator (123) which are sequentially connected, the in-use acid gas condenser (121) is connected with the in-use resolving tower (111), the in-use acid gas separator (123) is connected to an acid making system (100), and an in-use acid making valve (124) is arranged between the in-use acid gas separator (123) and the acid making system (100);
the standby desulfurization analysis system (2) comprises a standby rich liquid analysis unit (21) and a standby acid gas treatment unit (22), wherein the standby rich liquid analysis unit (21) comprises a standby analysis tower (211), the standby acid gas treatment unit (22) comprises a standby acid gas condenser (221), a standby acid gas cooler (222) and a standby acid gas separator (223) which are sequentially connected, the standby acid gas condenser (221) is connected with the standby analysis tower (211), the standby acid gas separator (223) is connected to the acid preparation system (100), and a standby acid preparation valve (224) is arranged between the standby acid gas separator (223) and the acid preparation system (100);
the communicating unit (4) comprises a communicating pipe (41), a communicating valve (42) and a flow rate meter, the flow rate meter and the communicating valve (42) are arranged on the communicating pipe (41), one end of the communicating pipe (41) is connected between the standby acid-gas separator (223) and the acid making system (100), and the other end of the communicating pipe (41) is connected between the acid-gas separator (123) and the acid making system (100).
2. The desulfurization resolving system according to claim 1, further comprising a flushing unit, wherein the flushing unit comprises a liquid supply device, a first flushing pipe (31) and a second flushing pipe (32), the first flushing pipe (31) and the second flushing pipe (32) are both connected to the liquid supply device, one end of the first flushing pipe (31) far away from the liquid supply device is connected with the active resolving tower (111), and one end of the second flushing pipe (32) far away from the liquid supply device is connected with the standby resolving tower (211).
3. A desulfurization resolving system switching method applied to the desulfurization resolving system according to claim 1 to 2,
the in-use desorption tower (111) is configured to be connected with a rich liquid input pipe (102), and an in-use rich liquid valve (114) is arranged between the in-use desorption tower (111) and the rich liquid input pipe (102); the in-use desorption tower (111) is also configured to be connected with a desulfurization system (101), and an in-use lean solution valve (115) is arranged between the in-use desorption tower (111) and the desulfurization system (101);
the standby desorption tower (211) is configured to be connected with the rich liquid input pipe (102), and a standby rich liquid valve (214) is arranged between the standby desorption tower (211) and the rich liquid input pipe (102); the standby desorption tower (211) is also configured to be connected with the desulfurization system (101), and a standby lean liquid valve (215) is arranged between the standby desorption tower (211) and the desulfurization system (101);
the in-use rich solution desorption unit (11) further comprises an in-use hot water reboiler (112) and an in-use steam reboiler (113), and the in-use hot water reboiler (112) and the in-use steam reboiler (113) are both connected to the in-use desorption tower (111);
the standby rich solution desorption unit (21) further comprises a standby hot water reboiler (212) and a standby steam reboiler (213), and the standby hot water reboiler (212) and the standby steam reboiler (213) are both connected to the standby desorption tower (211);
the method for switching the desulfurization analysis system comprises the following steps:
s1, opening the communication valve (42), and adjusting the opening of the communication valve (42) to enable the monitoring value of the flow meter to be equal to a first flow rate;
s2, keeping the first time until the first flow rate is reduced and is smaller than the second flow rate;
s3, opening the standby acid preparation valve (224);
s4, opening the standby steam reboiler (213);
s5, closing the in-use rich liquid valve (114) and fully opening the standby rich liquid valve (214);
s6, opening the standby hot water reboiler (212) and closing the in-use hot water reboiler (112);
s7, closing the in-use steam reboiler (113);
s8, opening the standby lean liquid valve (215), and closing the active lean liquid valve (115);
s9, opening the standby acid gas condenser (221), and closing the in-use acid gas condenser (121);
s10, opening the standby acid gas cooler (222), and closing the active acid gas cooler (122);
s11, closing the acid making valve (124) in use.
4. The desulfurization analysis system switching method according to claim 3,
before step S1, further comprising: s12, opening a circulating condensate inlet valve of the standby acid gas condenser (221) and filling the standby acid gas condenser (221); opening a circulating cooling liquid inlet valve of the standby acid gas cooler (222) to fill the standby acid gas cooler (222);
in step S9, opening the backup acid gas condenser (221) comprises opening a cycle condensate outlet valve of the backup acid gas condenser (221);
in step S10, opening the backup sour gas cooler (222) comprises opening a circulating coolant outlet valve of the backup sour gas cooler (222).
5. The desulfurization analysis system switching method according to claim 4, further comprising, before step S12: s13, reducing the opening degree of the current rich liquid valve (114) to be half of the full opening degree, opening the standby rich liquid valve (214), and closing the standby rich liquid valve (214) when the liquid level in the standby analysis tower (211) reaches a first liquid level value.
6. The desulfurization analysis system switching method according to claim 5, further comprising, before step S13: s14, flushing the spare analysis tower (211).
7. The desulfurization analysis system switching method according to claim 3,
before step S1, further comprising: s15, opening a circulating water inlet valve (2121) of the standby hot water reboiler (212) and filling the standby hot water reboiler (212);
in step S6, opening the standby hot water reboiler (212) comprises: and fully opening a circulating water inlet valve (2121) and a circulating water outlet valve (2122) of the standby hot water reboiler (212).
8. The desulfurization analysis system switching method according to claim 7, further comprising, in step S15: and opening the circulating water outlet valve (2122) to enable the opening degree of the circulating water outlet valve not to be larger than the first opening degree.
9. The desulfurization resolution system switching method according to claim 3, wherein the standby steam reboiler (213) is provided with a steam inlet valve (2131) and a steam outlet valve (2132), and the opening of the standby steam reboiler (213) in step S4 comprises:
s41, opening the steam inlet valve (2131) to enable the steam inlet valve to keep a second opening degree;
s42, keeping for a second time;
s43, opening the steam outlet valve (2132);
and S44, gradually increasing the opening degree of the steam inlet valve (2131) until a standard steam flow rate is reached.
10. The desulfurization resolving system switching method according to claim 3, wherein the liquid level of the in-use resolving tower (111) is required to be lower than the second liquid level value when step S8 is executed.
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