CN211098296U - Anti-freezing device of absorption tower - Google Patents
Anti-freezing device of absorption tower Download PDFInfo
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- CN211098296U CN211098296U CN201921484994.3U CN201921484994U CN211098296U CN 211098296 U CN211098296 U CN 211098296U CN 201921484994 U CN201921484994 U CN 201921484994U CN 211098296 U CN211098296 U CN 211098296U
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Abstract
The utility model discloses an defroster of absorption tower is formed with water inlet and delivery port on the wall of absorption tower, and the inside cooling coil of absorption tower links to each other with water inlet and delivery port. The water inlet of the cooling coil is connected with the water inlet pipe through the stop valve 1, and the water outlet is connected with the water outlet pipe through the stop valve 2. Through installing tee bend and stop valve 3 additional and be connected with steam main, install tee bend and stop valve 4 additional and be connected with condensate recovery water tank. When the cooling tower is shut down, the stop valve 1 and the stop valve 2 are closed, the stop valve 3 and the stop valve 4 are opened, and steam is introduced to heat the cooling coil, so that the temperature in the tower is increased, and the problems that water in the cooling coil is frozen and even frozen and cracked when the cooling coil does not work in winter in the prior art, normal production is seriously influenced, and potential safety hazards exist are solved.
Description
Technical Field
The utility model relates to a production facility technical field, in particular to freeze-proof device of absorption tower.
Background
In the process of producing nitric acid by using liquid ammonia as raw material, the liquid ammonia is evaporated to produce gas ammonia, and the gas ammonia is oxidized into NO in an oxidation furnace under the action of catalystxCooling and pressurizing the gas, introducing the gas into an acid absorption tower, and absorbing the gas into HNO by water under the conditions of high pressure and low temperature3. In order to improve the absorption rate, the heat in the absorption tower is taken away in two paths, one path is a closed-loop system, the heat in the absorption tower is exchanged with the evaporator, and the evaporation capacity of the evaporator is improved while the temperature in the absorption tower is reduced; the other path is a circulating water system, and heat is taken away by a circulating water cooling coil.
During the shutdown in winter, the cooling water in the cooling coil can freeze under the influence of low-temperature weather, so that the cooling coil breaks, the normal production is seriously influenced, and meanwhile, potential safety hazards exist.
The frost crack of the cooling coil of the absorption tower causes the increase of the production cost due to the generated maintenance cost and delays the starting progress.
In addition, water flowing out of the cooling coil is not removed after entering the absorption tower, and can be mixed with nitric acid when being started next time, so that the quality of the nitric acid is influenced.
Disclosure of Invention
An object of the utility model is to provide an freeze-proof device of absorption tower for in solving prior art, when shutting down winter, receive low temperature weather effect, the cooling water in the cooling coil freezes, causes the cooling coil to break, influences production, causes the problem of hidden danger.
In order to achieve the above purpose, the utility model provides an anti-freezing device of absorption tower, the absorption tower includes tower body 7, column plate 13, cooling coil 14, inlet tube bus 11, outlet pipe bus 12, inlet tube branch line 11a, outlet tube branch line 12a, 1 st stop valve 1, 2 nd stop valve 2, total stop valve 17 of intaking, total stop valve 18 of outlet water, column plate 13 is with the tower body 7 layering, in the appointed layer of tower body 7, be provided with cooling coil 14 respectively, the water inlet of each cooling coil 14 is connected with inlet tube branch line 11a through 1 st stop valve 1 respectively, each inlet tube branch line 11a is connected with inlet tube bus 11, through total stop valve 17 of intaking and the water UNICOM on the circulation; the delivery port of each cooling coil 14 is connected with 2 nd stop valve 2 and outlet pipe branch line 12a respectively, and each outlet pipe branch line 12a is connected with outlet pipe bus 12, through total stop valve 18 of play water and circulation return water UNICOM, its characterized in that, freeze-proof device includes: a 3 rd stop valve 3, a 4 th stop valve 4, a steam inlet main pipeline 9, a steam outlet main pipeline 10, a steam inlet branch pipeline 9a, a steam outlet branch pipeline 10a, a tee joint 16, a steam stop main valve 19 and a condensate water tank 20;
a tee joint 16 is connected to a water inlet pipe branch line 11a between the water inlet of each cooling coil 14 and the 1 st stop valve 1, the third end of the tee joint 16 is connected with a steam inlet branch line 9a, a 3 rd stop valve 3 is arranged on the steam inlet branch line 9a, each steam inlet branch line 9a is connected with a steam inlet main pipeline 9, and low-pressure steam is connected through a steam stop main valve 19;
a tee joint 16 is connected to a branch pipe 12a of the water outlet pipe between the water outlet of each cooling coil 14 and the 2 nd stop valve 2, the third end of the tee joint 16 is connected with a branch pipe 10a of the steam outlet, a 4 th stop valve 4 is arranged on the branch pipe 10a of the steam outlet, and each branch pipe 10a of the steam outlet is connected with a main pipeline 10 of the steam outlet and is connected with a condensate water tank 20;
when the machine is stopped, the 1 st stop valve 1, the 2 nd stop valve 2 and the water inlet total stop valve 17 are closed, the water outlet total stop valve 18 is opened, the 3 rd stop valve 3 and the 4 th stop valve 4 are opened, the steam stop total valve 19 is introduced into steam from the steam inlet total pipeline 9 to heat the cooling coil 14.
Furthermore, a pressure valve 5 is additionally arranged between the water inlet main stop valve 17 and the water inlet branch line 11a on the steam inlet main pipeline 9, and the pressure valve 5 is connected with a pressure gauge 6.
Further, a condensate recovery pipe 15 is connected to the outlet of the steam outlet main line 10, and is connected to the drain valve 8 and the condensate water tank 20.
Compared with the prior art, the freeze-proof device of absorption tower have following advantage: corresponding control valves (a pressure reducing valve, a drain valve and a stop valve) are additionally arranged, and steam tracing is additionally arranged on the cooling coil of the absorption tower, so that the temperature in the tower is increased, and the problem of freezing of water in the cooling coil when the cooling coil does not work in winter in the prior art is solved. The problem that the original large-scale absorption tower is insufficient in anti-freezing measures in winter is fully solved, and the risk caused by frost cracking of the cooling coil in subsequent production is avoided.
Drawings
FIG. 1 is an explanatory view of an absorption tower antifreeze apparatus.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
FIG. 1 is an explanatory view of an absorption tower antifreeze apparatus. Wherein, the dotted line part is a cooling water line, and the solid line part is an anti-freezing steam line.
As shown in figure 1, the absorption tower comprises a tower body 7, a tower plate 13, a cooling coil 14, a water inlet pipe bus 11, a water outlet pipe bus 12, a water inlet pipe branch 11a, a water outlet pipe branch 12a, a 1 st stop valve 1 and a 2 nd stop valve 2. The absorption tower has 8 layers, is provided with column plate 13 and cooling coil 14 respectively in 1, 4, 7 layers of tower body 7, and each cooling coil 14's water inlet is connected with inlet tube branch line 11a through 1 st stop valve 1 respectively, and each inlet tube branch line 11a is connected with inlet tube bus 11, through the total stop valve 17 of intaking and circulating water feed UNICOM.
The water outlets of the cooling coils 14 are respectively connected with water outlet pipe branch lines 12a through the No. 2 stop valve 2, and the water outlet pipe branch lines 12a are connected with a water outlet pipe bus 12 and communicated with circulating backwater through a water outlet main stop valve 18.
A tee joint 16 is additionally arranged on a water inlet pipe branch line 11a between the water inlet of each cooling coil 14 and the 1 st stop valve 1, the third end of the tee joint 16 is connected with a steam inlet branch line 9a, a 3 rd stop valve 3 is arranged on the steam inlet branch line 9a, each steam inlet branch line 9a is connected with a steam inlet main pipeline 9, and low-pressure steam is connected through a steam stop main valve 19.
A tee joint 16 is additionally arranged on a branch pipe 12a of the water outlet pipe between the water outlet of each cooling coil 14 and the 2 nd stop valve 2, the third end of the tee joint 16 is connected with a branch pipe 10a of a steam outlet, a 4 th stop valve 4 is arranged on the branch pipe 10a of the steam outlet, and each branch pipe 10a of the steam outlet is connected with a main pipeline 10 of the steam outlet and is connected with a condensate water tank 20.
A pressure valve 5 is additionally arranged between the water inlet main stop valve 17 and the water inlet branch line 11a on the steam inlet main pipeline 9, and the pressure valve 5 is connected with a pressure gauge 6; a condensate recovery pipe 15 is connected to the outlet of the steam outlet main line 10, and is connected to the drain valve 8 and the condensate water tank 20, as a preferable scheme of the embodiment.
In this embodiment, liquid ammonia is used as a raw material to produce nitric acid. The gas ammonia generated after the liquid ammonia is evaporated is oxidized into NOx gas, and the NOx gas enters an absorption tower and is absorbed into 2HNO by water3Namely:
3NO2+H2O＝2HNO3+ NO. This process is carried out simultaneously with the reoxidation of NO. Because the reaction has the characteristic of heat release, the temperature is reduced, the reaction speed and the oxidation degree of NO oxidized into high-valence oxides are favorably improved, and the absorption rate of nitric acid is improved.
When the machine is started, the 3 rd stop valve 3, the 4 th stop valve 4, the steam stop main valve 19, the drain valve 8, the adjusting pressure valve 5, open 1 st stop valve 1, the 2 nd stop valve 2, the total stop valve 17 of intaking, the total stop valve 18 of going out, introduce circulating water, the circulating water passes through the total pipeline of intaking, the total stop valve 17 of intaking, the inlet tube branch line (11a), via first stop valve 1, get into the cooling coil 14 in the absorption tower body 7 from the water inlet of cooling coil 14, again from the delivery port of cooling coil 14, the outlet pipe branch line 12a, via the 2 nd stop valve 2, the total pipeline 12 of going out, the total stop valve 18 of going out is to circulating water return, the water that circulates back and forth, take away the heat through cooling coil 14, reduce the temperature in the absorption tower body 7.
When the machine is stopped, the 1 st stop valve 1, the 2 nd stop valve 2, the total stop valve 17 of intaking, the total stop valve 18 of going out water, open the 3 rd stop valve 3, the 4 th stop valve 4, steam stop main valve 19, the trap 8, adjust pressure valve 5, let in the low-pressure steam (depending on the system) of 0.5MPa from steam inlet main line 9, low-pressure steam passes through steam inlet main line 9, steam inlet branch line 9a, the 3 rd stop valve 3, cooling coil 14's water inlet enters into the cooling coil 14 in the absorption tower body 7, flow through steam outlet branch line 10a, the 4 th stop valve 4 from the delivery port of cooling coil 14 again, summarize to steam outlet main line 10, lead to condensate water tank 20 through trap 8 through condensate recovery pipe 15 after the steam condenses into water. Steam is introduced to heat the cooling coil 14, so that the temperature in the absorption tower is increased; the temperature in the tower is higher than 0
The other cooling coils 14 in the tower can not be frozen at the temperature of DEG C, thereby thoroughly solving the hidden trouble of frost cracking of the cooling coils 14 of the absorption tower in winter and simultaneously not influencing the production when the absorption tower is started.
According to the embodiment, due to the fact that the corresponding pipelines and the control valves (the pressure reducing valve, the drain valve and the stop valve) are additionally arranged, steam tracing is additionally arranged on the cooling coil of the absorption tower, the temperature in the tower is increased, the cooling coil of the absorption tower is effectively prevented from being frozen and cracked, the influence on production, products and equipment is thoroughly solved, the production stability is guaranteed, and the product quality is guaranteed.
The above description is a few embodiments of the claimed invention, but should not be construed as limiting the invention. The protection scope of the present invention shall be subject to the claims.
Claims (3)
1. An anti-freezing device of an absorption tower comprises a tower body (7), tower plates (13), cooling coils (14), a water inlet pipe bus (11), a water outlet pipe bus (12), a water inlet pipe branch line (11a), a water outlet pipe branch line (12a), a 1 st stop valve (1), a 2 nd stop valve (2), a water inlet total stop valve (17) and a water outlet total stop valve (18), wherein the tower plates (13) layer the tower body (7), the specified layer of the tower body (7) is respectively provided with the cooling coils (14), the water inlets of the cooling coils (14) are respectively connected with the water inlet pipe branch line (11a) through the 1 st stop valve (1), and the water inlet pipes (11a) are connected with the water inlet pipe bus (11) and are communicated with circulating water through the water inlet total stop valve (17); the delivery port of each cooling coil (14) respectively with 2 nd stop valve (2) with outlet pipe branch line (12a) is connected, and each outlet pipe branch line (12a) is connected with outlet pipe bus (12), through total stop valve of outlet water (18) and circulation return water UNICOM, its characterized in that, freeze-proof device includes: a 3 rd stop valve (3), a 4 th stop valve (4), a steam inlet main pipeline (9), a steam outlet main pipeline (10), a steam inlet branch pipeline (9a), a steam outlet branch pipeline (10a), a tee joint (16), a steam stop main valve (19) and a condensate water tank (20);
the tee joint (16) is connected to the water inlet pipe branch line (11a) between the water inlet of each cooling coil (14) and the 1 st stop valve (1), the third end of the tee joint (16) is connected with the steam inlet branch line (9a), the 3 rd stop valve (3) is arranged on the steam inlet branch line (9a), each steam inlet branch line (9a) is connected with the steam inlet main pipeline (9), and low-pressure steam is connected through the steam stop main valve (19);
the water outlet pipe branch line (12a) between the water outlet of each cooling coil (14) and the 2 nd stop valve (2) is connected with the tee joint (16), the third end of the tee joint (16) is connected with the steam outlet branch line (10a), the 4 th stop valve (4) is arranged on the steam outlet branch line (10a), and each steam outlet branch line (10a) is connected with the steam outlet main pipeline (10) and the condensate water tank (20);
when the machine is stopped, the 1 st stop valve (1), the 2 nd stop valve (2), the water inlet main stop valve (17), the water outlet main stop valve (18) are opened, the 3 rd stop valve (3) and the 4 th stop valve (4) are opened, the steam stop main valve (19) is used for leading steam into the steam inlet main pipeline (9) to heat the cooling coil (14).
2. The antifreeze apparatus for absorption tower according to claim 1, wherein: on the steam inlet main pipeline (9), a pressure valve (5) is additionally arranged between the water inlet main stop valve (17) and the water inlet branch line (11a), and the pressure valve (5) is connected with a pressure gauge (6).
3. The antifreeze apparatus for absorption tower according to claim 1, wherein: a condensate recovery pipe (15) is connected at the outlet of the steam outlet main pipeline (10), is connected with a drain valve (8) and is connected to the condensate water tank (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921484994.3U CN211098296U (en) | 2019-09-06 | 2019-09-06 | Anti-freezing device of absorption tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921484994.3U CN211098296U (en) | 2019-09-06 | 2019-09-06 | Anti-freezing device of absorption tower |
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| CN211098296U true CN211098296U (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921484994.3U Active CN211098296U (en) | 2019-09-06 | 2019-09-06 | Anti-freezing device of absorption tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279232A (en) * | 2021-12-28 | 2022-04-05 | 贵州芭田生态工程有限公司 | Closed-loop circulating water heating system and method thereof |
-
2019
- 2019-09-06 CN CN201921484994.3U patent/CN211098296U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279232A (en) * | 2021-12-28 | 2022-04-05 | 贵州芭田生态工程有限公司 | Closed-loop circulating water heating system and method thereof |
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