CN211435679U - Hydrogen chloride absorption system - Google Patents
Hydrogen chloride absorption system Download PDFInfo
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- CN211435679U CN211435679U CN201922211714.8U CN201922211714U CN211435679U CN 211435679 U CN211435679 U CN 211435679U CN 201922211714 U CN201922211714 U CN 201922211714U CN 211435679 U CN211435679 U CN 211435679U
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- hydrogen chloride
- chloride absorption
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- receiving tank
- concentrated acid
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Abstract
The utility model discloses a hydrogen chloride absorption system, including falling liquid film absorber, receiving tank, expansion joint, concentrated acid delivery pump, hydrogen chloride absorption tower, falling liquid film absorber's import and hydrogen chloride inlet line intercommunication, falling liquid film absorber bottom and receiving tank import pass through the expansion joint intercommunication, receiving tank bottom export and concentrated acid delivery pump import intercommunication, concentrated acid delivery pump export and concentrated acid output pipeline intercommunication, be equipped with first circulation branch road and second circulation branch road on the concentrated acid output pipeline, the export and the receiving tank intercommunication of first circulation branch road, the export and the falling liquid film absorber intercommunication of second circulation branch road, receiving tank top gas outlet and hydrogen chloride absorption tower bottom intercommunication. The device of the utility model is simple and compact in structure, can obviously promote the hydrogen chloride absorption effect, and can satisfy the environmental protection requirement simultaneously, have good economic benefits and social.
Description
Technical Field
The utility model belongs to the technical field of chemical substance separation and purification, especially, relate to a hydrogen chloride absorption system.
Background
In the chemical production process, the reaction process of the chlorine-containing compound is often accompanied by the generation of hydrogen chloride gas, such as the hydrolysis of chlorosilane in the production process of organic silicon, hydrogen chloride tail gas generated in the production process of polycrystalline silicon and white carbon black, and the like. Because the hydrogen chloride gas is very easy to dissolve in water and has corrosivity after being dissolved in water, the hydrogen chloride tail gas must be recycled for environmental protection treatment requirements and improving the economy of the device.
The hydrogen chloride absorption system applied at present usually adopts a mode of venturi jet absorption and then absorption by a packed tower, and the absorbent is usually alkali liquor, water or a combination of the alkali liquor and the water. However, such absorption systems have the following disadvantages and drawbacks:
1. the hydrogen chloride absorption process is a heat release process, a large amount of heat is generated no matter alkali liquor or water is absorbed, an external heating device or a cooler needs to be added, and the device investment and the occupied area are increased;
2. the hydrogen chloride absorption effect is influenced due to heat release in the hydrogen chloride absorption process. Especially for water absorption, in order to overcome the influence, the amount of absorbed water is often increased and a multi-stage absorption system is arranged to achieve a satisfactory absorption effect;
3. a large amount of salt-containing wastewater can be generated by adopting alkali liquor absorption, so that the load of a wastewater treatment system is increased; and the water absorption is adopted, so that a large amount of low-concentration waste acid (19-25 w%) is produced as a byproduct, and the utilization is difficult and the economic benefit is poor.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention aims to provide a hydrogen chloride absorption system with a simple and compact structure, which can significantly improve the hydrogen chloride absorption effect, and can satisfy the environmental protection requirement, and has good economic and social benefits.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a hydrogen chloride absorption system comprises a falling film absorber, a receiving tank, an expansion joint, a concentrated acid delivery pump, a concentrated acid output pipeline, a hydrogen chloride absorption tower and a dilute acid circulating pump, wherein an inlet of the falling film absorber is communicated with a hydrogen chloride feeding pipeline, the bottom of the falling film absorber is communicated with an inlet of the receiving tank through the expansion joint, an outlet at the bottom of the receiving tank is communicated with an inlet of the concentrated acid delivery pump, an outlet of the concentrated acid delivery pump is communicated with the concentrated acid output pipeline, a first circulating branch and a second circulating branch are arranged on the concentrated acid output pipeline, an outlet of the first circulating branch is communicated with the receiving tank, an outlet of the second circulating branch is communicated with the falling film absorber, and a gas outlet at the top of the receiving tank is communicated with the bottom of the hydrogen chloride absorption tower;
the hydrogen chloride absorption tower is a two-section type packed tower, a liquid distributor is arranged at the top of each section of packing respectively, the inlet of the liquid distributor is communicated with an industrial water pipeline, the outlet of the bottom of the hydrogen chloride absorption tower is communicated with a dilute acid circulating pump, and the outlet of the dilute acid circulating pump is communicated with a falling film absorber.
Further, the falling film absorber is a shell and tube graphite heat exchanger.
Further, be equipped with flow transmitter on the hydrogen chloride inlet pipe, be equipped with the second governing valve on the second circulation branch road, be equipped with the industrial water pipeline ooff valve on the industrial water pipeline, second governing valve, industrial water pipeline ooff valve are chain with flow transmitter respectively.
Furthermore, the receiving tank is provided with a second liquid level transmitter, the concentrated acid output pipeline is provided with a third regulating valve, and the second liquid level transmitter is interlocked with the third regulating valve.
Further, the hydrogen chloride absorption tower is equipped with first liquid level changer, dilute acid circulating line governing valve is equipped with on the diluted acid circulating pump export and the interface of falling film absorber, first liquid level changer, flow transmitter are chain with dilute acid circulating line governing valve respectively.
Furthermore, a demisting device is arranged at the top of the hydrogen chloride absorption tower.
Further, the bottom of the hydrogen chloride absorption tower is provided with a gas distributor, and a gas outlet at the top of the receiving tank is communicated with the gas distributor.
Further, the gas distributor is a vane type gas distributor.
Compared with the prior art, the hydrogen chloride absorption system of the utility model has the following advantages:
(1) the device of the utility model has compact structure, less required equipment, economic and reasonable investment and good economic benefit.
(2) The utility model discloses hydrogen chloride gas adopts the two-stage to absorb among the device, and gas absorption rate is high, but the diluted acid cyclic utilization of production can satisfy the environmental protection requirement simultaneously at furthest recovery hydrogen chloride.
(3) The utility model discloses hydrogen chloride absorption process release heat can in time shift out the system among the device, reduces the thermal effect influence, improves the absorption effect.
(4) The utility model discloses the dilute acid is absorbed as the absorbent that the one-level was absorbed to second grade among the device, reduces the spent acid and discharges, and the by-product high concentration hydrochloric acid is favorable to follow-up utilization simultaneously, has improved the economic nature of device.
(5) The utility model discloses hydrogen chloride discharge pipeline flow and absorbent pipeline valve chain can realize the automatic control operation among the device.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a diagram of a hydrogen chloride absorption system according to an embodiment of the present invention.
Description of reference numerals:
1-a falling film absorber; 2-a receiving tank; 3-an expansion joint; 4-concentrated acid delivery pump; 5-concentrated acid output pipeline; 51-third regulating valve; 6-first circulation branch; 61-a first regulating valve; 7-a second circulation branch, 71-a second regulating valve; 8-a flow transmitter; 9-a gas distributor; a 10-hydrogen chloride absorption tower; 11-a filler; 12-a liquid distributor; 13-dilute acid circulating pump; 14-a demisting device; 15-a first level transmitter; 16-dilute acid recycle line regulating valve; 17-industrial water line switching valve; 18-a second liquid level transmitter;
a-hydrogen chloride gas; b-circulating water; c-high concentration hydrochloric acid; d-first order residual hydrogen chloride gas; e-industrial water; f-circulating dilute acid; g-harmless tail gas.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
Example (b):
as shown in fig. 1, a hydrogen chloride absorption system comprises a falling film absorber 1, a receiving tank 2, an expansion joint 3, a concentrated acid delivery pump 4, a concentrated acid output pipeline 5, a hydrogen chloride absorption tower 10 and a dilute acid circulating pump 13, wherein an inlet of the falling film absorber 1 is communicated with a hydrogen chloride feeding pipeline, an inlet of the falling film absorber 1 is communicated with an inlet of the receiving tank 2 through the expansion joint 3, an outlet of the bottom of the receiving tank 2 is communicated with an inlet of the concentrated acid delivery pump 4, an outlet of the concentrated acid delivery pump 4 is communicated with the concentrated acid output pipeline 5, a first circulating branch 6 and a second circulating branch 7 are arranged on the concentrated acid output pipeline 5, an outlet of the first circulating branch 6 is communicated with the receiving tank 2, an outlet of the second circulating branch 7 is communicated with the falling film absorber 1, and a gas outlet of the top of the receiving tank 2 is communicated with the bottom of the hydrogen chloride. Preferably, the falling film absorber 1 is a shell and tube graphite heat exchanger. The bottom of the falling film absorber 1 is connected with the receiving tank 2 through the expansion joint 3, so that the graphite heat exchange tube of the falling film absorber 1 can be effectively prevented from being damaged.
The hydrogen chloride absorption tower 10 is a two-section type packed tower, the top of each section of packing is respectively provided with a liquid distributor 12, the inlet of the liquid distributor 12 is communicated with an industrial water pipeline, the outlet at the bottom of the hydrogen chloride absorption tower 10 is communicated with a dilute acid circulating pump 13, and the outlet of the dilute acid circulating pump 13 is communicated with the falling film absorber 1. The bottom of the hydrogen chloride absorption tower 10 is provided with a gas distributor 9, and a gas outlet at the top of the receiving tank 2 is communicated with the gas distributor 9, preferably, the gas distributor 9 is a blade-type gas distributor. Preferably, the tower body of the hydrogen chloride absorption tower 10 is of a glass lining structure, the filler 11 is made of a non-metal material, and the absorbent is industrial water e.
The hydrogen chloride feeding pipeline is provided with a flow transmitter 8, the second circulating branch 7 is provided with a second regulating valve 71, the industrial water pipeline is provided with an industrial water pipeline switch valve 17, and the second regulating valve 71 and the industrial water pipeline switch valve 17 are respectively linked with the flow transmitter 8. The receiving tank 2 is provided with a second liquid level transmitter 18, the concentrated acid output pipeline 5 is provided with a third regulating valve 51, and the second liquid level transmitter 18 is interlocked with the third regulating valve 51. The hydrogen chloride absorption tower 10 is provided with a first liquid level transmitter 15, a dilute acid circulating pipeline regulating valve 16 is arranged on a connecting passage of an outlet of the dilute acid circulating pump 13 and the falling film absorber 1, and the first liquid level transmitter 15 and the flow transmitter 8 are respectively interlocked with the dilute acid circulating pipeline regulating valve 16.
Preferably, the top of the hydrogen chloride absorption tower 10 is provided with a demisting device 14. The defogging device 14 can intercept liquid drops in the tail gas, and only harmless gas is discharged to the outside through the defogging device 14, so that the full utilization of dilute acid is ensured, and meanwhile, pollution is prevented.
When the hydrogen chloride absorption system works, taking a hydrolysis section of organic silicon production as an example, an organic silicon production device M2 (dimethyldichlorosilane) hydrolysis section is an important component of organic silicon monomer production, a main product of M2 hydrolysis is a methyl cyclosiloxane mixture, and hydrogen chloride is a byproduct; during normal operation, hydrogen chloride is mainly used for methyl chloride synthesis; when the reaction is abnormally operated or emptied, a large amount of hydrogen chloride gas cannot be used for reaction, and the hydrogen chloride gas needs to be absorbed and treated by a hydrogen chloride absorption system. The hydrogen chloride gas a after M2 hydrolysis is discharged into the high-efficiency hydrogen chloride absorption system at 10 ℃ and 0.3MPa when the hydrogen chloride gas a is abnormally operated.
The discharged hydrogen chloride gas a and circulating diluted acid f enter a tube pass of the falling film absorber 1 together to be subjected to primary absorption, the circulating diluted acid f forms a uniform liquid film on the graphite heat exchange tube, and the hydrogen chloride gas a is fully absorbed to form high-concentration hydrochloric acid c which enters a receiving tank 2 for temporary storage and is sent out of the device through a concentrated acid delivery pump 4 in time. The shell pass of the falling film absorber 1 is circulating water b, and the circulating water b continuously circulates to absorb hydrogen chloride in time and then releases heat to be taken out of the system.
The primary residual hydrogen chloride gas d which cannot be completely absorbed flows out from a gas outlet at the top of the receiving tank 2 and enters a hydrogen chloride absorption tower 10 through a blade type gas distributor 9 for secondary absorption. The first-stage residual hydrogen chloride gas d enters a packed tower 10 to be in countercurrent contact with water for absorption, the circulating dilute acid f formed after absorption is collected at the bottom of the tower, the circulating dilute acid f is sent to a falling film absorber 1 through a tower bottom dilute acid circulating pump 13 to be used as an absorbent for first-stage absorption, and harmless tail gas g is discharged from the top of the tower.
Preferably, the first circulation branch 6 is provided with a first regulating valve 61, and the hydrogen chloride absorption system opens the first regulating valve 61 to make the concentrated acid flow back to the receiving tank 2 at the initial stage of introducing the hydrogen chloride gas, i.e. when the hydrogen chloride absorption system starts to work, so as to help the system enter a stable operation state as soon as possible.
When the concentration of the obtained high-concentration hydrochloric acid c is low, the high-concentration hydrochloric acid c can be returned to the falling film absorber 1 through the second circulation branch 7, hydrogen chloride absorption is performed again, and the concentration of the high-concentration hydrochloric acid c is further increased, so that the hydrochloric acid with economic value is obtained.
The flow transmitter 8 on the hydrogen chloride gas feeding pipeline is in linkage relation with the second regulating valve 71 on the concentrated acid circulating pipeline, the dilute acid circulating pipeline regulating valve 16 and the industrial water pipeline switch valve 17, so that the automatic control operation of the device can be ensured.
After the hydrogen chloride enters the system, the flow transmitter 8 senses the flow change, the industrial water switch valve 17 is opened in an interlocking mode, and if the system continuously has hydrogen chloride gas entering, the switch valve 17 is kept in a normally open state.
The hydrogen chloride gas is mainly absorbed by the circulating diluted acid at the bottom of the hydrogen chloride absorption tower 10, and for the circulating amount of the diluted acid, the opening degree of the diluted acid circulating pipeline adjusting valve 16 is adjusted according to the hydrogen chloride flow fed back by the flow transmitter 8 and the hydrogen chloride and water absorption ratio set by the system.
When the hydrogen chloride flow is increased, the opening degree of the dilute acid circulating pipeline regulating valve 16 is increased, the dilute acid circulating amount is increased, and in order to ensure the continuous and stable operation of the system, the industrial water flow is synchronously increased. Otherwise, the valve opening is reduced, and the circulation volume is reduced.
The flow transmitter 8 on the hydrogen chloride gas feeding pipeline is interlocked with the second regulating valve 71 on the concentrated acid circulating pipeline, and the concentrated acid is forcibly circulated according to a certain proportion, namely once the flow transmitter 8 detects the flow, the concentrated acid is circulated, and the hydrogen chloride is absorbed as much as possible to reach saturation. The concentrated acid circulation amount can be set according to actual conditions, and the concentrated acid circulation can be used as a supplementary improvement means for hydrogen chloride absorption.
The receiving tank 2 and the hydrogen chloride absorption tower 10 are respectively provided with liquid level transmitters 18 and 15 which are respectively interlocked with a third regulating valve 51 on the concentrated acid output pipeline 5 and a dilute acid circulating pipeline regulating valve 16 to regulate the liquid level in the equipment to maintain stable operation.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a hydrogen chloride absorption system, includes falling liquid film absorber (1), receives jar (2), expansion joint (3), concentrated acid delivery pump (4), concentrated acid output pipeline (5), hydrogen chloride absorption tower (10) and dilute acid circulating pump (13), its characterized in that: an inlet of the falling film absorber (1) is communicated with a hydrogen chloride feeding pipeline, the bottom of the falling film absorber (1) is communicated with an inlet of a receiving tank (2) through an expansion joint (3), an outlet of the bottom of the receiving tank (2) is communicated with an inlet of a concentrated acid delivery pump (4), an outlet of the concentrated acid delivery pump (4) is communicated with a concentrated acid output pipeline (5), a first circulation branch (6) and a second circulation branch (7) are arranged on the concentrated acid output pipeline (5), an outlet of the first circulation branch (6) is communicated with the receiving tank (2), an outlet of the second circulation branch (7) is communicated with the falling film absorber (1), and a gas outlet of the top of the receiving tank (2) is communicated with the bottom of a hydrogen chloride absorption tower (10);
the hydrogen chloride absorption tower (10) is a two-section type packed tower, a liquid distributor (12) is arranged at the top of each section of packing respectively, the inlet of the liquid distributor (12) is communicated with an industrial water pipeline, the outlet at the bottom of the hydrogen chloride absorption tower (10) is communicated with a dilute acid circulating pump (13), and the outlet of the dilute acid circulating pump (13) is communicated with the falling film absorber (1).
2. A hydrogen chloride absorption system according to claim 1, wherein: the falling film absorber (1) is a shell-and-tube graphite heat exchanger.
3. A hydrogen chloride absorption system according to claim 1, wherein: be equipped with flow transmitter (8) on the hydrogen chloride inlet line, be equipped with second governing valve (71) on second circulation branch road (7), be equipped with industrial water pipeline ooff valve (17) on the industrial water pipeline, second governing valve (71), industrial water pipeline ooff valve (17) are interlocked with flow transmitter (8) respectively.
4. A hydrogen chloride absorption system according to claim 1, wherein: the receiving tank (2) is provided with a second liquid level transmitter (18), the concentrated acid output pipeline (5) is provided with a third regulating valve (51), and the second liquid level transmitter (18) is interlocked with the third regulating valve (51).
5. A hydrogen chloride absorption system according to claim 3, wherein: hydrogen chloride absorption tower (10) are equipped with first liquid level transmitter (15), be equipped with diluted acid circulation pipeline governing valve (16) on the access of diluted acid circulating pump (13) export and falling film absorber (1), first liquid level transmitter (15), flow transmitter (8) are interlocked with diluted acid circulation pipeline governing valve (16) respectively.
6. A hydrogen chloride absorption system according to claim 1, wherein: and a demisting device (14) is arranged at the top of the hydrogen chloride absorption tower (10).
7. A hydrogen chloride absorption system according to claim 1, wherein: the bottom of the hydrogen chloride absorption tower (10) is provided with a gas distributor (9), and a gas outlet at the top of the receiving tank (2) is communicated with the gas distributor (9).
8. A hydrogen chloride absorption system according to claim 7, wherein: the gas distributor (9) is a vane type gas distributor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922211714.8U CN211435679U (en) | 2019-12-11 | 2019-12-11 | Hydrogen chloride absorption system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922211714.8U CN211435679U (en) | 2019-12-11 | 2019-12-11 | Hydrogen chloride absorption system |
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| CN211435679U true CN211435679U (en) | 2020-09-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113477036A (en) * | 2021-07-24 | 2021-10-08 | 四川永祥股份有限公司 | Industrial hydrochloric acid absorption system |
| CN114427615A (en) * | 2020-09-16 | 2022-05-03 | 中国石油化工股份有限公司 | Water seal device for torch system and operation method thereof |
-
2019
- 2019-12-11 CN CN201922211714.8U patent/CN211435679U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114427615A (en) * | 2020-09-16 | 2022-05-03 | 中国石油化工股份有限公司 | Water seal device for torch system and operation method thereof |
| CN114427615B (en) * | 2020-09-16 | 2024-05-14 | 中国石油化工股份有限公司 | Water sealing device for torch system and operation method thereof |
| CN113477036A (en) * | 2021-07-24 | 2021-10-08 | 四川永祥股份有限公司 | Industrial hydrochloric acid absorption system |
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