CN203295209U - Desorption hydrolysis device for preparing urea - Google Patents
Desorption hydrolysis device for preparing urea Download PDFInfo
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- CN203295209U CN203295209U CN2013204144633U CN201320414463U CN203295209U CN 203295209 U CN203295209 U CN 203295209U CN 2013204144633 U CN2013204144633 U CN 2013204144633U CN 201320414463 U CN201320414463 U CN 201320414463U CN 203295209 U CN203295209 U CN 203295209U
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- desorption
- hydrolysis
- tower
- desorption tower
- desorb
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Abstract
The utility model relates to the field of chemical industry, in particular to a desorption hydrolysis device for preparing urea. The desorption hydrolysis device comprises an ammonia water tank connected with a desorption hydrolysis system, the desorption hydrolysis system comprises a desorption column heat exchanger, a pipeline of the ammonia water tank is connected with the desorption column heat exchanger, contacts with a drainpipe of a second desorption column and then is connected into a first desorption column, and an air channel pipeline below the first desorption column is connected with a hydrolysis column and the second desorption column. By the aid of the technical scheme, compared with the prior art, the desorption hydrolysis device has the advantages that the desorption hydrolysis device is efficient and environmentally friendly, rapid desorption can be realized, and recovery rates of raw ammonia and CO2 are high.
Description
Technical field
The utility model relates to chemical field, relates in particular to a kind of desorb hydrolysis device for preparing urea.
Background technology
In traditional urea production process, desorb be hydrolyzed often process and separate, do not have strict heat exchange and primary heater unit, therefore affected to a certain extent the efficiency of desorb, affected the process of operation.
The utility model content
The purpose of this utility model is to provide a kind of desorb hydrolysis device for preparing urea of efficient, environmental protection.
In order to realize above purpose, the utility model adopts following technical scheme: a kind of desorb hydrolysis device for preparing urea, comprise ammonia vessel, described ammonia vessel connects desorption and hydrolysis system, described desorption and hydrolysis system comprises the desorption tower interchanger, the pipeline of ammonia vessel connects the desorption tower interchanger and contacts with the drain pipe of the second desorption tower, accesses subsequently the first desorption tower, and the first desorption tower below gas path pipe is connected with hydrolysis tower and the second desorption tower.
The further technical scheme of the utility model is, described the first desorption tower also connects reflux exchanger.
The further technical scheme of the utility model is, the liquid line outlet connection hydrolysis tower heat exchanger of described the first desorption tower, the drain pipe of the first desorption tower contact hydrolysis tower.
The further technical scheme of the utility model is, described hydrolysis tower is connected with the second desorption tower pipeline.
The further technical scheme of the utility model is, described reflux exchanger is the connecting tube pump also.
The further technical scheme of the utility model is, described reflux exchanger also connects the normal pressure absorption tower.
Adopt as above the utility model of technical scheme, with respect to prior art, following beneficial effect is arranged: efficient, environmental protection, desorb rapidly,, reach raw material ammonia and CO
2The high rate of recovery.
The accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment, wherein: 1 ammonia vessel; 2 desorption and hydrolysis systems; 3 first desorption towers; 4 hydrolysis towers; 5 second desorption towers; 6 reflux exchangers; 7 hydrolysis tower heat exchangers; 8 in-line pumps; 9 normal pressure absorption towers; 10 carbamate condensers.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described, embodiment does not form restriction of the present utility model.
Embodiment
As shown in Figure 1, a kind of desorb hydrolysis device for preparing urea, comprise ammonia vessel 1, ammonia vessel 1 connects desorption and hydrolysis system 2, desorption and hydrolysis system 2 comprises the desorption tower interchanger, the pipeline of ammonia vessel 1 connects the desorption tower interchanger and contacts with the drain pipe of the second desorption tower 5, accesses subsequently the first desorption tower 3, the first desorption tower 3 below gas path pipes and is connected with hydrolysis tower 4 and the second desorption tower 2.The first desorption tower 3 also connects reflux exchanger 6.The liquid line outlet of the first desorption tower 3 connects the drain pipe of hydrolysis tower heat exchanger 7, the first desorption tower 3 contact hydrolysis towers 4.Hydrolysis tower 4 is connected with the second desorption tower 2 pipelines.Reflux exchanger 6 is gone back connecting tube pump 8.Reflux exchanger 6 also connects normal pressure absorption tower 9.
The present embodiment prepares the working process of the desorb hydrolysis device of urea:
Most of ammoniacal liquor in ammonia vessel 1 is delivered to desorption and hydrolysis system 2, processes recovery.Ammoniacal liquor and the second desorption tower 5 fluid heat exchange in the desorption tower heat exchanger, temperature rises to 117, enter the first desorption tower 3, with the back flow of gas that hydrolysis tower 4 and the second desorption tower come, contact respectively from top to bottom subsequently, ammonia and carbonic acid gas a large amount of in ammoniacal liquor are desorbed out, and gas enters reflux exchanger 6 and carries out the condensation absorption.
The working pressure of the first desorption tower 3 is about 0.3MPa.The liquid that leaves the first desorption tower 3 boosts to 1.9MPa through the hydrolysis pump and enters hydrolysis tower heat exchanger 7, with hydrolysis tower 4 fluid thermal exchange, temperature rises to 170 by 142, through Liquid level adjusting valve, send into hydrolysis tower 4 tops again, hydrolysis tower 4 working pressures are 1.9MPa, service temperature is 208, the 2.4MPa steam supply that hydrolysis institute heat requirement adds through steam regulating valve at the bottom of by tower.Due to high temperature and stop for a long time, the urea in liquid phase is hydrolyzed into ammonia and carbonic acid gas.Hydrolysis tower 4 top Exhaust Gas are delivered to the 7th block of column plate of the first desorption tower 3 after decompression, as stripping gas and heat is provided.Leave the liquid of hydrolysis tower 4, temperature is down to 155 after heat exchange, after decompression, delivers to the further desorb of the second desorption tower 5.The second desorption tower 5 desorb institute heat requirements add in 0.8MPa presses drum to provide.Ammonia and carbonic acid gas in liquid almost all are desorbed out at this, tower top is given vent to anger and is directly delivered to the first desorption tower 3 bottoms, the second desorption tower 5 bottom waste liquids are after the desorption tower heat exchanger reclaims heat, and temperature is down to 86 from 145, go to rear workshop section to recycle.
From the gas of the first desorption tower 3, enter reflux exchanger 6 and carry out the condensation absorption, heat is removed by pipe side recirculated water.For guaranteeing the condensation effect in winter, prevent local-crystalizedly, between the recirculated water inlet/outlet pipe of reflux exchanger 6, be provided with an in-line pump 8, to improve cooling water inlet temperature.First ammonium liquid after absorption is delivered to small portion and is back to the first desorption tower 3 tops, thereby guarantees phegma concentration to regulate the first desorption tower 3 air outlet temperatures.Go out the gas of reflux exchanger 6 after gas-liquid separation, deliver to normal pressure absorption tower 9.
Claims (6)
1. desorb hydrolysis device for preparing urea, it is characterized in that, comprise ammonia vessel (1), described ammonia vessel (1) connects desorption and hydrolysis system (2), described desorption and hydrolysis system (2) comprises the desorption tower interchanger, the pipeline of ammonia vessel (1) connects the desorption tower interchanger and contacts with the drain pipe of the second desorption tower (5), access subsequently the first desorption tower (3), the first desorption tower below gas path pipe is connected with hydrolysis tower (4) and the second desorption tower (2).
2. a kind of desorb hydrolysis device for preparing urea according to claim 1, is characterized in that, described the first desorption tower (3) also connects reflux exchanger (6).
3. a kind of desorb hydrolysis device for preparing urea according to claim 1, it is characterized in that, the liquid line outlet of described the first desorption tower (3) connects hydrolysis tower heat exchanger (7), the drain pipe of the first desorption tower (3) contact hydrolysis tower (4).
4. a kind of desorb hydrolysis device for preparing urea according to claim 1, is characterized in that, described hydrolysis tower (4) is connected with the second desorption tower (2) pipeline.
5. a kind of desorb hydrolysis device for preparing urea according to claim 2, is characterized in that, described reflux exchanger (6) is gone back connecting tube pump (8).
6. a kind of desorb hydrolysis device for preparing urea according to claim 2, is characterized in that, described reflux exchanger (6) also connects normal pressure absorption tower (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204144633U CN203295209U (en) | 2013-07-11 | 2013-07-11 | Desorption hydrolysis device for preparing urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204144633U CN203295209U (en) | 2013-07-11 | 2013-07-11 | Desorption hydrolysis device for preparing urea |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203295209U true CN203295209U (en) | 2013-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013204144633U Expired - Fee Related CN203295209U (en) | 2013-07-11 | 2013-07-11 | Desorption hydrolysis device for preparing urea |
Country Status (1)
| Country | Link |
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| CN (1) | CN203295209U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103950954A (en) * | 2014-05-13 | 2014-07-30 | 西安丹辉环保科技有限公司 | Embraced-type heating small urea hydrolysis reaction device and hydrolysis method thereof |
-
2013
- 2013-07-11 CN CN2013204144633U patent/CN203295209U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103950954A (en) * | 2014-05-13 | 2014-07-30 | 西安丹辉环保科技有限公司 | Embraced-type heating small urea hydrolysis reaction device and hydrolysis method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131120 Termination date: 20170711 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |