CN214715624U - Calcium nitrate reaction tower tail gas processing apparatus - Google Patents
Calcium nitrate reaction tower tail gas processing apparatus Download PDFInfo
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- CN214715624U CN214715624U CN202120143424.9U CN202120143424U CN214715624U CN 214715624 U CN214715624 U CN 214715624U CN 202120143424 U CN202120143424 U CN 202120143424U CN 214715624 U CN214715624 U CN 214715624U
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- tail gas
- calcium nitrate
- reaction tower
- nitrate reaction
- pipe fitting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The utility model provides a calcium nitrate reaction tower tail gas processing apparatus belongs to tail gas treatment technical field. The device includes calcium nitrate reaction tower and tail gas absorption tower, and the top of calcium nitrate reaction tower is provided with tail gas ejection of compact pipe fitting, is provided with the draught fan on the tail gas ejection of compact pipe fitting, and tail gas absorption tower middle part is provided with the distribution and packs, and the bottom is provided with the circulation cistern, is filled with lime cream absorption liquid in the circulation cistern, and the discharge end is provided with the circulating pump. The outlet end of the induced draft fan is communicated with the tail gas absorption towerAnd the lower part is provided with a circulating pipe fitting and a discharging pipe fitting at a discharge hole of the circulating pump, the circulating pipe fitting is communicated with the upper part of the tail gas absorption tower, and the discharging pipe fitting is communicated with the upper part of the calcium nitrate reaction tower. By distributing the filler, the tail gas can be fully contacted with the lime cream, thereby reducing the discharge amount of the tail gas of the calcium nitrate reaction tower and CO2The recycling of the nitric acid steam is realized. CO 22Finally, the tail gas is only exhausted from the top of the tail gas absorption tower, which is beneficial to discharging CO in the tail gas2And controlling the concentration index.
Description
Technical Field
The utility model belongs to the technical field of the tail gas treatment, concretely relates to calcium nitrate reaction tower tail gas processing apparatus.
Background
Calcium nitrate is an important inorganic raw material and inorganic fertilizer, and is usually prepared by contact reaction of nitric acid and limestone, and the tail gas generated by the reaction contains a large amount of CO2And nitric acid vapor, such as direct discharge, resulting in environmental pollution and waste of raw materials.
In the prior art, for example, chinese patent No. 201610903619.2 discloses a method and a device for producing calcium nitrate liquid, which indicates that lime milk is contacted and absorbed with tail gas generated by a calcium nitrate reaction tower, and the lime milk is sent into a neutralization tank after being circularly absorbed, so as to neutralize residual nitric acid in the calcium nitrate liquid. Although the method reduces the exhaust emission to a certain extent, the following problems also exist:
firstly, the contact reaction between the tail gas of the calcium nitrate reaction tower and the lime cream is insufficient, which easily causes the emission of CO in the tail gas2The content exceeds the standard;
secondly, the lime milk after the circulating absorption is sent into a neutralization tank, and impurities contained in the lime milk are also sent into the neutralization tank to pollute the calcium nitrate liquid; at the same time, carbon dioxide is discharged from the neutralization tank, resulting in CO2The content exceeds the standard.
Disclosure of Invention
In view of this, the utility model provides a calcium nitrate reaction tower tail gas processing apparatus to CO in the tail gas is discharged to the calcium nitrate reaction tower who solves existence among the prior art2The content exceeds the standard.
The utility model provides a technical scheme that its technical problem adopted is:
the tail gas treatment device comprises a calcium nitrate reaction tower, wherein a tail gas discharging pipe fitting is arranged at the top of the calcium nitrate reaction tower, a draught fan is arranged on the tail gas discharging pipe fitting, the tail gas treatment device also comprises a tail gas absorption tower, the middle part of the tail gas absorption tower is provided with a distributed filler, the bottom of the tail gas absorption tower is provided with a circulating liquid tank, lime milk absorption liquid is filled in the circulating liquid tank, and a circulating pump is arranged at the discharging end of the circulating liquid tank; the exit end intercommunication of draught fan the lower part of tail gas absorption tower, the discharge gate of circulating pump sets up circulation pipe fitting and ejection of compact pipe fitting, circulation pipe fitting intercommunication the upper portion of tail gas absorption tower, ejection of compact pipe fitting intercommunication the upper portion of calcium nitrate reaction tower.
Preferably, the tail gas treatment device of the calcium nitrate reaction tower further comprises a lime milk preparation tank, a discharge end of the lime milk preparation tank is provided with a lime milk feed pump, and an outlet of the lime milk feed pump is communicated with the upper part of the tail gas absorption tower.
Preferably, the distribution filler comprises an upper layer of filler and a lower layer of filler, the circulation pipe is communicated with the upper part of the lower layer of filler, and the outlet of the lime milk feed pump is communicated with the upper part of the upper layer of filler.
Preferably, the top of the calcium nitrate reaction tower is provided with a tail gas filter cavity, and the tail gas discharge pipe fitting is connected with the tail gas filter cavity.
Preferably, the tail gas filtering cavity is filled with tail gas filtering filler.
Preferably, the discharge pipe is communicated with the tail gas filtering cavity and is positioned above the tail gas filtering filler.
According to the above technical scheme, the utility model provides a calcium nitrate reaction tower tail gas processing apparatus, its beneficial effect is: the tail gas absorption tower is internally provided with distributed filler, the bottom of the tail gas absorption tower is provided with a circulating liquid tank, and the tail gas absorption tower is from a calcium nitrate reaction tower and contains high-concentration CO2Tail gas of nitric acid steam enters the tail gas absorption tower from the bottom and is contacted and absorbed with lime milk entering the tail gas absorption tower from the upper part to generate calcium nitrate and calcium carbonate, the lime milk is circularly absorbed and then sent back to the calcium nitrate reaction tower through the discharge pipe fitting, on one hand, the tail gas of the calcium nitrate reaction tower can be fully contacted with the lime milk through the distribution filler, and the nitrate is reducedThe discharge amount of tail gas of the calcium carbonate reaction tower, and CO2On the other hand, realizes the recycling of nitric acid steam. CO 22Finally, the tail gas is only exhausted from the top of the tail gas absorption tower, thereby being beneficial to discharging CO in the tail gas2And controlling the concentration index.
Drawings
FIG. 1 is a schematic pipeline flow diagram of a tail gas treatment device of a calcium nitrate reaction tower.
In the figure: the device comprises a calcium nitrate reaction tower tail gas treatment device 10, a calcium nitrate reaction tower 100, a tail gas discharge pipe fitting 200, a draught fan 300, a tail gas absorption tower 400, a distribution filler 410, an upper layer filler 411, a lower layer filler 412, a circulating liquid tank 420, a circulating pump 430, a circulating pipe fitting 431, a discharge pipe fitting 432, a lime milk preparation tank 500, a lime milk supplement pump 510, a tail gas filter cavity 600 and a tail gas filter filler 610.
Detailed Description
The following combines the drawings of the utility model to further elaborate the technical scheme and technical effect of the utility model.
Referring to fig. 1, in an embodiment, an apparatus 10 for treating tail gas from a calcium nitrate reaction tower is used for treating and recycling tail gas generated in a calcium nitrate preparation process. Calcium nitrate reaction tower tail gas processing apparatus 10 includes calcium nitrate reaction tower 100, the top of calcium nitrate reaction tower 100 is provided with tail gas ejection of compact pipe fitting 200, be provided with draught fan 300 on the tail gas ejection of compact pipe fitting 200.
The calcium nitrate reaction tower tail gas treatment device 10 further comprises a tail gas absorption tower 400, wherein the middle part of the tail gas absorption tower 400 is provided with a distribution filler 410, the bottom of the tail gas absorption tower 400 is provided with a circulating liquid tank 420, the circulating liquid tank 420 is filled with lime cream absorption liquid, and a discharge end of the circulating liquid tank is provided with a circulating pump 430. The outlet end of the induced draft fan 300 is communicated with the lower part of the tail gas absorption tower 400, a discharge hole of the circulating pump 430 is provided with a circulating pipe 431 and a discharging pipe 432, the circulating pipe 431 is communicated with the upper part of the tail gas absorption tower 400, and the discharging pipe 432 is communicated with the upper part of the calcium nitrate reaction tower 100.
In the calcium nitrate reaction tower 100, nitric acid and limestone are in contact reactionCalcium nitrate is generated and a large amount of CO is produced2The tail gas of the calcium nitrate reaction tower 100 also contains high-concentration nitric acid vapor because the reaction is an exothermic process. Under the effect of draught fan 300, tail gas that produces in the calcium nitrate reaction tower 100 gets into through tail gas ejection of compact pipe fitting 200 tail gas absorption tower 400 bottom, with get into from the upper portion lime cream contact absorption of tail gas absorption tower 400 generates calcium nitrate, calcium carbonate, lime cream is through the circulation absorption back, send back to through ejection of compact pipe fitting 432 calcium nitrate reaction tower 100. On one hand, the tail gas of the calcium nitrate reaction tower 100 can be fully contacted with the lime milk through the distribution filler 410, so that the discharge amount of the tail gas of the calcium nitrate reaction tower 100 and CO are reduced2On the other hand, realizes the recycling of nitric acid steam. CO 22Finally, the tail gas is only exhausted from the top of the tail gas absorption tower 400, which is beneficial to the CO in the exhausted tail gas2And controlling the concentration index.
Further, the calcium nitrate reaction tower tail gas treatment device 10 further comprises a lime milk configuration tank 500, a lime milk supplement pump 510 is arranged at a discharge end of the lime milk configuration tank 500, and an outlet of the lime milk supplement pump 510 is communicated with the upper part of the tail gas absorption tower 400. Lime milk absorption liquid absorbing nearly saturated is sent back to the calcium nitrate reaction tower 100 through the discharge pipe 432, and fresh lime milk is sent into the tail gas absorption tower 400 through a lime milk feed pump 510, so as to ensure that the lime milk circulation liquid in the circulation liquid tank 420 is not supersaturated, and ensure that CO is not supersaturated2And the absorption efficiency of nitric acid.
Further, the distribution filler 410 comprises an upper layer of filler 411 and a lower layer of filler 412, the circulation pipe is communicated with the upper part of the lower layer of filler 412, and the outlet of the lime milk supplement pump 510 is communicated with the upper part of the upper layer of filler 411. Under the action of the circulating pump 430, the lime milk in the circulating liquid tank 420 is subjected to primary contact absorption with the tail gas of the calcium nitrate reaction tower 100 through the lower packing 412, and the primarily absorbed tail gas and the fresh lime milk are subjected to secondary absorption through the upper packing 411, so that the CO in the discharged tail gas is further reduced2And the content of nitric acid.
In an embodiment, a tail gas filtering cavity 600 is disposed at the top of the calcium nitrate reaction tower 100, and the tail gas discharging pipe 200 is connected to the tail gas filtering cavity 600. Preferably, the tail gas filter chamber 600 is filled with a tail gas filter filler 610, so as to filter solid particles contained in the tail gas and prevent the solid particles from entering the tail gas absorption tower 400 when the tail gas is discharged.
Further, the discharge pipe 432 is communicated with the tail gas filtering cavity 600 and is located above the tail gas filtering filler 610. On one hand, the tail gas filter filler is washed by feeding of the circulating liquid, and on the other hand, the tail gas of the calcium nitrate reaction tower 100 is preliminarily washed, so that CO in the discharged tail gas is further ensured2The concentration index is qualified.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (6)
1. The tail gas treatment device for the calcium nitrate reaction tower comprises the calcium nitrate reaction tower, wherein a tail gas discharging pipe fitting is arranged at the top of the calcium nitrate reaction tower, and a draught fan is arranged on the tail gas discharging pipe fitting;
the exit end intercommunication of draught fan the lower part of tail gas absorption tower, the discharge gate of circulating pump sets up circulation pipe fitting and ejection of compact pipe fitting, circulation pipe fitting intercommunication the upper portion of tail gas absorption tower, ejection of compact pipe fitting intercommunication the upper portion of calcium nitrate reaction tower.
2. The tail gas treatment device of the calcium nitrate reaction tower as claimed in claim 1, further comprising a lime milk preparation tank, wherein a discharge end of the lime milk preparation tank is provided with a lime milk feed pump, and an outlet of the lime milk feed pump is communicated with the upper part of the tail gas absorption tower.
3. The tail gas treatment device of the calcium nitrate reaction tower as claimed in claim 2, wherein the distribution filler comprises an upper layer filler and a lower layer filler, the circulation pipe is communicated with the upper part of the lower layer filler, and the outlet of the lime milk feed pump is communicated with the upper part of the upper layer filler.
4. The tail gas treatment device for the calcium nitrate reaction tower as claimed in claim 1, wherein a tail gas filter chamber is arranged at the top of the calcium nitrate reaction tower, and the tail gas discharge pipe fitting is connected with the tail gas filter chamber.
5. The calcium nitrate reaction tower tail gas treatment device of claim 4, wherein the tail gas filtering cavity is filled with tail gas filtering filler.
6. The tail gas treatment device of the calcium nitrate reaction tower as claimed in claim 5, wherein the discharge pipe is communicated with the tail gas filter chamber and is positioned above the tail gas filter filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120143424.9U CN214715624U (en) | 2021-01-19 | 2021-01-19 | Calcium nitrate reaction tower tail gas processing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120143424.9U CN214715624U (en) | 2021-01-19 | 2021-01-19 | Calcium nitrate reaction tower tail gas processing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214715624U true CN214715624U (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120143424.9U Active CN214715624U (en) | 2021-01-19 | 2021-01-19 | Calcium nitrate reaction tower tail gas processing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214715624U (en) |
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2021
- 2021-01-19 CN CN202120143424.9U patent/CN214715624U/en active Active
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