CN213610699U - Tail gas and exhaust gas washing unit for sodium chlorate plant - Google Patents

Abstract

The utility model discloses a tail gas of sodium chlorate factory, exhaust washing unit, it includes tail gas washing tower, exhaust washing tower and alkali lye conveyer pipe, and it still includes first circulating pump, second circulating pump and useless alkali jar. The advantages are that: feeding all the high-quality alkali liquor fed into the system from the tail gas washing tower to wash tail gas, and feeding the waste alkali liquor discharged from the tail gas washing tower into an exhaust gas washing tower to wash the exhaust gas of a chemical storage tank; on one hand, the requirement of the tail gas washing tower on the high concentration of alkali liquor is met, and the washing effect of the tail gas washing tower is improved; on the other hand, the effective components in the waste alkali discharged from the tail gas washing tower are recycled, so that the high-efficiency utilization of the alkali is realized, the consumption of alkali liquor is reduced, and the production cost is further reduced.

Description

Tail gas and exhaust gas washing unit for sodium chlorate plant

The technical field is as follows:

the utility model relates to a sodium chloride production technical field, specifically speaking relate to a tail gas of sodium chlorate factory, exhaust washing unit.

Background art:

the production method of sodium chlorate is mainly electrolytic method, its technological process mainly includes brine process, electrolytic process, crystallization drying process, etc., generally uses hydrogen dioxide as reducing agent, and the sodium chlorate can be matched with chlorine dioxide production equipment using hydrochloric acid as reducing agent. Wherein, tail gas containing hydrogen, chlorine and the like is generated in the reaction process of the electrolytic cell and needs to be sent into a tail gas washing tower to be washed by 12 percent liquid caustic soda; the exhaust gas generated by chemical storage equipment such as a hydrochloric acid storage tank needs to be sent into an exhaust gas washing tower to be washed by alkali liquor. Therefore, the tail gas washing tower and the exhaust gas washing tower need to consume a large amount of alkali liquor, and the consumption of alkali liquor in a sodium chloride plant is increased; and the waste alkali discharged from the tail gas washing tower and the exhaust gas washing tower is discharged to a waste water tank, so that the effective components in the waste alkali can not be effectively utilized, and the waste of chemicals is caused.

The utility model has the following contents:

the utility model aims to provide a sodium chlorate factory tail gas, exhaust washing unit of reduction alkali lye consumption.

The utility model discloses by following technical scheme implement: the tail gas and exhaust gas washing unit comprises a tail gas washing tower, an exhaust gas washing tower, an alkali liquor conveying pipe, a first circulating pump, a second circulating pump and a waste alkali tank, wherein the inlet of the first circulating pump is communicated with a tower bottom liquid outlet pipeline of the exhaust gas washing tower, the outlet of the first circulating pump is divided into two paths, one path is communicated with a washing liquor inlet pipeline of the exhaust gas washing tower through a first return pipe, and the other path is communicated with the inlet of the waste alkali tank through an alkali liquor collecting pipe; a first control valve and a first one-way valve are sequentially arranged on the first return pipe, and a collection control valve is arranged on the alkali liquor collection pipe; the inlet of the second circulating pump is communicated with a tower bottom liquid outlet pipeline of the tail gas washing tower, the outlet of the second circulating pump is divided into two paths, one path is communicated with a washing liquid inlet pipeline of the tail gas washing tower through a second return pipe, and the other path is communicated with a first return pipe between the first control valve and the first one-way valve through an alkali liquor recycling pipe; a second control valve and a second one-way valve are sequentially arranged on the second return pipe, and a recycling control valve is arranged on the alkali liquor recycling pipe; the outlet of the alkali liquor conveying pipe is communicated with the second return pipe between the second control valve and the second one-way valve, and a liquid supplementing control valve is installed on the alkali liquor conveying pipe.

Furthermore, the outlet of the collecting control valve is communicated with the inlet of a diversion groove of the brine process through a spent caustic soda pipe, and the spent caustic soda pipe is provided with a spent caustic soda control valve.

The utility model has the advantages that: feeding all the high-quality alkali liquor fed into the system from the tail gas washing tower to wash tail gas, and feeding the waste alkali liquor discharged from the tail gas washing tower into an exhaust gas washing tower to wash the exhaust gas of a chemical storage tank; on one hand, the requirement of the tail gas washing tower on the high concentration of alkali liquor is met, and the washing effect of the tail gas washing tower is improved; on the other hand, the effective components in the waste alkali discharged from the tail gas washing tower are recycled, so that the high-efficiency utilization of the alkali is realized, the consumption of alkali liquor is reduced, and the production cost is further reduced.

Description of the drawings:

fig. 1 is a schematic view of the overall structure of the present invention.

The device comprises a tail gas washing tower 1, an exhaust gas washing tower 2, an alkali liquor conveying pipe 3, a first circulating pump 4, a second circulating pump 5, an alkali waste tank 6, a first backflow pipe 7, an alkali liquor collecting pipe 8, a first control valve 9, a first one-way valve 10, a collecting control valve 11, a second backflow pipe 12, an alkali liquor recycling pipe 13, a second control valve 14, a second one-way valve 15, a recycling control valve 16, a liquid supplementing control valve 17, an alkali waste pipe 18, a baffling groove 19 and an alkali waste control valve 20.

The specific implementation mode is as follows:

in the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "second," "first," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1, the tail gas and exhaust gas washing unit of a sodium chlorate plant comprises a tail gas washing tower 1, an exhaust gas washing tower 2, an alkali liquor conveying pipe 3, a first circulating pump 4, a second circulating pump 5 and a waste alkali tank 6, wherein an inlet of the first circulating pump 4 is communicated with a tower bottom liquid outlet pipeline of the exhaust gas washing tower 2, an outlet of the first circulating pump 4 is divided into two paths, one path is communicated with a washing liquor inlet pipeline of the exhaust gas washing tower 2 through a first return pipe 7, and the other path is communicated with an inlet of the waste alkali tank 6 through an alkali liquor collecting pipe 8; a first control valve 9 and a first one-way valve 10 are sequentially arranged on the first return pipe 7, and a collection control valve 11 is arranged on the alkali liquor collection pipe 8;

the inlet of the second circulating pump 5 is communicated with a tower bottom liquid outlet pipeline of the tail gas washing tower 1, the outlet of the second circulating pump 5 is divided into two paths, one path is communicated with a washing liquid inlet pipeline of the tail gas washing tower 1 through a second return pipe 12, and the other path is communicated with a first return pipe 7 between a first control valve 9 and a first one-way valve 10 through an alkali liquor recycling pipe 13; a second control valve 14 and a second one-way valve 15 are sequentially arranged on the second return pipe 12, and a recycling control valve 16 is arranged on the alkali liquor recycling pipe 13;

the outlet of the alkali liquor conveying pipe 3 is communicated with a second return pipe 12 between a second control valve 14 and a second one-way valve 15, and a liquid supplementing control valve 17 is arranged on the alkali liquor conveying pipe 3.

When the system normally operates, the collection control valve 11 is closed, other valves are opened, tail gas generated by the electrolytic cell is sent to the tail gas washing tower 1, and exhaust gas generated by chemical storage equipment such as a hydrochloric acid storage tank is sent to the exhaust gas washing tower 2; the alkali liquor from the alkali liquor delivery pipe 3 is delivered into the tail gas washing tower 1 through a second return pipe 12 to be sprayed from top to bottom, and the tail gas of the electrolytic cell in the tail gas washing tower is washed and purified; the second circulating pump 5 pumps out the alkali liquor at the bottom of the tail gas washing tower 1, one part of the alkali liquor is sent to the top of the tail gas washing tower 1 again through the second control valve 14 and the second return pipe 12 for reflux, and the other part of the alkali liquor enters the exhaust gas washing tower 2 through the reuse control valve 16, the alkali liquor reuse pipe 13 and the first return pipe 7 to be used as the washing liquor of the exhaust gas washing tower 2 for washing the gas in the exhaust gas washing tower 2; the first circulating pump 4 pumps out the liquid at the bottom of the exhaust gas washing tower 2 and returns the liquid to the top of the tower through the first control valve 9 and the first return pipe 7; in the process, the cleaning solution at the bottom of the exhaust gas washing tower 2 is periodically sampled and inspected, when the alkali liquor concentration is detected to be lower than the process requirement, the opening degrees of a first control valve 9 and a second control valve 14 are reduced, a collection control valve 11 is increased, and the opening degrees of a liquid supplementing control valve 17 and a recycling control valve 16 are increased, so that on one hand, a large amount of cleaning solution at the bottom of the exhaust gas washing tower 2 is sent to a waste alkali tank 6 for collection through the collection control valve 11 and an alkali liquor collecting pipe 8 by a first circulating pump 4; on the other hand, the addition amount of new alkali liquor is increased through the alkali liquor conveying pipe 3, and the concentration of the alkali liquor in the tail gas washing tower 1 and the exhaust gas washing tower 2 is improved; and when the alkali concentration at the bottom of the exhaust gas washing tower 2 is detected to meet the process requirement, switching each valve to a normal operation state of the system.

Preferably, the outlet of the collecting control valve 11 is communicated with the inlet of a baffling groove 19 of the brine process through a waste alkali pipe 18, and a waste alkali control valve 20 is arranged on the waste alkali pipe 18; part of the alkali liquor discharged by the collection control valve 11 is directly fed into a baffle groove 19 of brine Gong and calcium carbonate impurities in the brine are removed by the alkali liquor.

Feeding all high-quality (high-concentration) alkali liquor fed into the system from the tail gas washing tower 1 to wash tail gas, and feeding the alkali liquor discharged from the tail gas washing tower 1 into the exhaust gas washing tower 2 to wash the exhaust gas of a chemical storage tank; on one hand, the requirement of the tail gas washing tower 1 on the high concentration of alkali liquor is met, and the washing effect of the tail gas washing tower 1 is improved; on the other hand, the effective components in the waste alkali discharged from the tail gas washing tower 1 are recycled, so that the high-efficiency utilization of the alkali is realized, the consumption of alkali liquor is reduced, and the production cost is further reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (2)

1. The tail gas and exhaust gas washing unit of the sodium chlorate plant comprises a tail gas washing tower, an exhaust gas washing tower and an alkali liquor conveying pipe, and is characterized by further comprising a first circulating pump, a second circulating pump and a waste alkali tank, wherein the inlet of the first circulating pump is communicated with a tower bottom liquid outlet pipeline of the exhaust gas washing tower, the outlet of the first circulating pump is divided into two paths, one path is communicated with a washing liquor inlet pipeline of the exhaust gas washing tower through a first return pipe, and the other path is communicated with the inlet of the waste alkali tank through an alkali liquor collecting pipe; a first control valve and a first one-way valve are sequentially arranged on the first return pipe, and a collection control valve is arranged on the alkali liquor collection pipe; the inlet of the second circulating pump is communicated with a tower bottom liquid outlet pipeline of the tail gas washing tower, the outlet of the second circulating pump is divided into two paths, one path is communicated with a washing liquid inlet pipeline of the tail gas washing tower through a second return pipe, and the other path is communicated with a first return pipe between the first control valve and the first one-way valve through an alkali liquor recycling pipe; a second control valve and a second one-way valve are sequentially arranged on the second return pipe, and a recycling control valve is arranged on the alkali liquor recycling pipe; the outlet of the alkali liquor conveying pipe is communicated with the second return pipe between the second control valve and the second one-way valve, and a liquid supplementing control valve is installed on the alkali liquor conveying pipe.

2. The sodium chlorate plant tail gas and exhaust gas washing unit as claimed in claim 1, wherein the outlet of the collection control valve is communicated with the inlet of the diversion tank of the brine process through a spent caustic pipe, and the spent caustic control valve is mounted on the spent caustic pipe.

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