CN110975531A - Ammonia gas treatment method in cyanuric acid production - Google Patents
Ammonia gas treatment method in cyanuric acid production Download PDFInfo
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- CN110975531A CN110975531A CN201911421094.9A CN201911421094A CN110975531A CN 110975531 A CN110975531 A CN 110975531A CN 201911421094 A CN201911421094 A CN 201911421094A CN 110975531 A CN110975531 A CN 110975531A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
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- Treating Waste Gases (AREA)
Abstract
The invention discloses an ammonia gas treatment method in cyanuric acid production, which relates to the technical field of cyanuric acid production equipment and comprises the following steps: washing ammonia gas in the pyrolysis furnace by adopting a liquid urea washing system to absorb urea steam carried in the ammonia gas; and reducing the temperature of the ammonia gas by using a cooling system and discharging. According to the invention, the urea vapor in the ammonia gas is recovered by using the liquid urea, the ammonia gas and the liquid urea are shunted by the shunt assembly in the ammonia washing tower, so that the ammonia gas can be fully contacted with the liquid urea, the urea vapor carried in the ammonia gas is dissolved in the liquid urea, and the liquid urea is converged at the bottom of the ammonia washing tower for recycling. The invention can improve the recovery rate of urea and realize the purposes of energy saving and consumption reduction.
Description
Technical Field
The invention relates to the technical field of cyanuric acid production equipment, in particular to a method for treating ammonia gas in cyanuric acid production.
Background
In the process of producing cyanuric acid by using urea, the urea needs to be heated, and a certain amount of ammonia gas can be generated when the urea is heated, so that part of urea steam can be carried in the discharged ammonia gas. In the prior art, urea in ammonia gas is collected by a water washing method, and the urea in waste liquid is evaporated at high temperature after collection for reuse. The recovery mode not only has high energy consumption, but also has lower recovery rate.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for treating ammonia gas in cyanuric acid production, which can effectively improve the recovery rate of urea and reduce energy consumption.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for treating ammonia gas in cyanuric acid production comprises the following steps:
washing ammonia gas in the pyrolysis furnace by adopting a liquid urea washing system to absorb urea steam carried in the ammonia gas; and reducing the temperature of the ammonia gas by using a cooling system and discharging.
Preferably, the liquid urea washing system comprises an ammonia washing tower, an ammonia gas inlet of the ammonia washing tower is communicated with the pyrolysis furnace through an ammonia gas discharge pipe, the ammonia gas inlet is arranged on the side wall of the middle part of the ammonia washing tower, an exhaust port and a urea inlet communicated with a liquid urea pipe are arranged at the top of the ammonia washing tower, a flow distribution assembly used for dispersing ammonia gas and urea is arranged at the upper part of the ammonia washing tower, the flow distribution assembly is arranged above the ammonia gas inlet, and the urea inlet is arranged above the flow distribution assembly; and a discharge pipe is arranged at the bottom of the ammonia washing tower.
Preferably, the flow dividing assembly is a plurality of sieve plates which are arranged on the upper part of the ammonia washing tower at intervals from top to bottom; the sieve plates are provided with a plurality of sieve holes, and the sieve holes on the upper sieve plate and the lower sieve plate are arranged in a staggered mode.
Preferably, the discharge pipe of the ammonia washing tower is connected with a urea tank for containing liquid urea, the discharge pipe of the urea tank is connected with a heat exchanger through a circulating pump, and the discharge port of the heat exchanger is connected with the urea inlet of the ammonia washing tower; and a cooling medium inlet and a cooling medium outlet of the heat exchanger are connected with a cooling system.
Preferably, the exhaust port of the ammonia washing tower is connected with the air inlet of the secondary baffle side wall through an exhaust pipe, the air outlet of the secondary baffle top is connected with an ammonia pipeline, and the bottom discharge port of the secondary baffle is connected with the urea tank.
Preferably, the bottom of the urea tank is provided with a cooling pipe connected with a cooling system.
Preferably, the bottom of the ammonia washing tower is provided with a cooling pipe connected with a cooling system.
Preferably, a liquid level meter and a thermometer are arranged in the urea tank, and a thermometer is arranged on the ammonia gas pipe.
Preferably, the cooling pipes in the ammonia washing tower and the urea tank are coiled coils.
Preferably, the top of the inner cavity of the ammonia washing tower is provided with a spray pipe, the spray pipe penetrates through a urea inlet and is communicated with a liquid urea pipe, the spray pipe is a coil pipe, and the lower surface of the spray pipe is provided with a plurality of spray holes.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: compared with the prior art, the method adopts a liquid urea washing system to wash the ammonia gas discharged from the pyrolysis furnace, and uses the liquid urea to absorb urea vapor carried in the ammonia gas; and then the ammonia gas is cooled by a cooling system and discharged. The liquid urea washing system realizes full contact of ammonia gas and liquid urea through the ammonia washing tower, so that urea steam carried in the ammonia gas is dissolved in the liquid urea, and the liquid urea is collected to the bottom of the ammonia washing tower for recycling. The invention can improve the recovery rate of urea and realize the purposes of energy saving and consumption reduction. The invention is also suitable for the production and preparation of dichloroisocyanuric acid, sodium dichloroisocyanurate and trichloroisocyanuric acid.
Drawings
FIG. 1 is a schematic flow chart of a method for treating ammonia gas in cyanuric acid production according to an embodiment of the present invention;
in the figure: 00-a pyrolysis furnace, 01-an ammonia gas inlet, 02-an exhaust port, 03-a urea inlet, 04-a cooling liquid inlet pipe and 05-a cooling liquid outlet pipe; 1-ammonia pipe, 2-ammonia washing tower, 3-liquid urea pipe, 4-sieve plate, 5-urea tank, 6-circulating pump, 7-heat exchanger, 8-branch pipe, 9-double baffle, 10-ammonia pipeline, 11-cooling pipe, 12-liquid level meter and 13-thermometer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides an ammonia gas treatment method in cyanuric acid production, which is shown in figure 1 and comprises the following steps: washing ammonia gas in the pyrolysis furnace 00 by adopting a liquid urea washing system to absorb urea steam carried in the ammonia gas; and reducing the temperature of the ammonia gas by using a cooling system and discharging.
As shown in fig. 1, the liquid urea washing system comprises an ammonia washing tower 2, wherein an ammonia gas inlet 01 of the ammonia washing tower 2 is communicated with a pyrolysis furnace 00 through an ammonia pipe 1, and an exhaust fan can be mounted on the ammonia pipe to increase the ammonia gas discharge speed; the ammonia gas inlet 01 is arranged on the side wall of the middle part of the ammonia washing tower 2, the top of the ammonia washing tower 2 is provided with an exhaust port 02 and a urea inlet 03 communicated with a liquid urea pipe 3, the upper part of the ammonia washing tower 2 is provided with a flow distribution assembly for dispersing ammonia and urea, the flow distribution assembly is arranged above the ammonia gas inlet 01, and the urea inlet 03 is arranged above the flow distribution assembly; and a discharge pipe is arranged at the bottom of the ammonia washing tower 2.
In a preferred embodiment of the present invention, as shown in fig. 1, the flow dividing assembly is a plurality of sieve plates 4, and the sieve plates 4 are arranged in parallel at intervals from top to bottom in the upper part of the ammonia washing tower 2; the sieve plates 4 are provided with a plurality of sieve holes, and the sieve holes on the sieve plates 4 adjacent to each other are arranged in a staggered manner. By adopting the structure, the ammonia gas can rise in a curve manner, and then the ammonia gas is fully contacted with the liquid urea, so that the urea steam in the ammonia gas is fully dissolved in the liquid urea.
In order to facilitate the storage of liquid urea, as shown in fig. 1, the discharge pipe of the ammonia scrubber 2 is connected with a urea tank 5 for containing liquid urea, the discharge pipe of the urea tank 5 is connected with a heat exchanger 7 through a circulating pump 6, and the discharge port of the heat exchanger 7 is connected with the urea inlet of the ammonia scrubber 2; and a cooling medium inlet and a cooling medium outlet of the heat exchanger 7 are connected with a cooling system. The liquid urea output by the circulating pump is cooled by the heat exchanger and then recycled to the ammonia washing tower to circularly absorb urea steam in the ammonia gas for multiple times. In addition, the outlet of the circulating pump 6 is also provided with a branch pipe 8 which is communicated with the production pipeline, and the liquid urea in the urea tank is recycled when the quantity of the liquid urea is excessive.
In one embodiment of the invention, as shown in fig. 1, the exhaust port of the ammonia scrubber 2 is connected with the side wall gas inlet of the secondary baffle 9 through an exhaust pipe, the top gas outlet of the secondary baffle 9 is connected with an ammonia gas pipeline 10, and the bottom discharge port of the secondary baffle 9 is connected with the urea tank 5. The ammonia gas discharged from the ammonia washing tower can be dedusted by the aid of the secondary gear, and the dedusted ammonia gas is discharged through an ammonia gas pipeline, and meanwhile, part of liquid urea in the ammonia gas can be separated out and converged to a urea tank.
As the temperature of the ammonia gas discharged in the heating process of the urea is extremely high, the technical scheme is further optimized, and as shown in figure 1, a cooling pipe 11 connected with a cooling system is arranged at the bottom of the urea tank 5. Wherein, the bottom of the ammonia washing tower 2 is provided with a cooling pipe 11 connected with a cooling system. The cooling pipes 11 in the ammonia washing tower 2 and the urea tank 5 are coiled coils, so that the cooling of liquid urea can be accelerated. The medium of heat exchanger is imported and exported, is washed the both ends of the cooling tube in ammonia tower and the urea jar and is advanced pipe 04 and coolant liquid exit tube 05 intercommunication with cooling system's coolant liquid respectively, can in time cool down ammonia and liquid urea, avoids washing the temperature of ammonia tower and urea jar too high, has the potential safety hazard. Wherein, the cooling liquid in the cooling system can be selected from cooling water.
In an embodiment of the present invention, as shown in fig. 1, a liquid level meter 12 and a temperature meter 13 are disposed in the urea tank 5, and a temperature meter 13 is disposed on the ammonia pipe 1. Adopt this structure can monitor the temperature in ammonia tower and the urea jar of washing at any time, utilize cooling system to cool down to safe numerical value with it.
Further optimize above-mentioned technical scheme, wash the inner chamber top of ammonia tower 2 and be equipped with the shower (the drawing is not drawn), the shower runs through urea import and liquid urea pipe intercommunication, the shower is the coil pipe, the lower surface of shower is equipped with a plurality of and sprays the hole. By adopting the structure, the liquid urea can be uniformly dispersed, the contact area with ammonia gas is enlarged, and then the urea steam in the ammonia gas is fully recovered.
In conclusion, the urea vapor in the ammonia gas discharged by the liquid urea absorption pyrolysis furnace has the advantage of high recovery efficiency of the urea vapor, the ammonia gas can rise in a curve in the ammonia washing tower through the sieve plates in the ammonia washing tower, and meanwhile, the liquid urea can be dispersed along the sieve plates in the falling process, so that the contact area of the ammonia gas and the liquid urea is increased, and the urea vapor in the ammonia gas is fully recovered; realize the circulation of liquid urea through urea jar and circulating pump and recycle, utilize the cooling tube that links to each other with cooling system to wash ammonia tower and urea jar and cool down, the liquid urea of coolant liquid through the heat exchanger convection current heat exchanger further cools down simultaneously, and liquid urea after the cooling can assist the cooling to the ammonia with the ammonia contact in-process in washing the ammonia tower. The invention is also suitable for the production and preparation of dichloroisocyanuric acid, sodium dichloroisocyanurate and trichloroisocyanuric acid.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A method for treating ammonia gas in cyanuric acid production is characterized by comprising the following steps: washing ammonia gas in the pyrolysis furnace by adopting a liquid urea washing system to absorb urea steam carried in the ammonia gas; and reducing the temperature of the ammonia gas by using a cooling system and discharging.
2. The method for treating ammonia gas in cyanuric acid production according to claim 1, wherein: the liquid urea washing system comprises an ammonia washing tower, an ammonia gas inlet of the ammonia washing tower is communicated with a pyrolysis furnace through an ammonia gas discharge pipe, the ammonia gas inlet is arranged on the side wall of the middle part of the ammonia washing tower, an exhaust port and a urea inlet used for being communicated with a liquid urea pipe are arranged at the top of the ammonia washing tower, a flow distribution assembly used for dispersing ammonia gas and urea is arranged at the upper part of the ammonia washing tower, the flow distribution assembly is arranged above the ammonia gas inlet, and the urea inlet is arranged above the flow distribution assembly; and a discharge pipe is arranged at the bottom of the ammonia washing tower.
3. The method for treating ammonia gas in cyanuric acid production according to claim 2, wherein: the flow dividing assembly is a plurality of sieve plates which are arranged on the upper part of the ammonia washing tower at intervals from top to bottom; the sieve plates are provided with a plurality of sieve holes, and the sieve holes on the upper sieve plate and the lower sieve plate are arranged in a staggered mode.
4. The method for treating ammonia gas in cyanuric acid production according to claim 3, wherein: the discharge pipe of the ammonia washing tower is connected with a urea tank for containing liquid urea, the discharge pipe of the urea tank is connected with a heat exchanger through a circulating pump, and the discharge port of the heat exchanger is connected with the urea inlet of the ammonia washing tower; and a cooling medium inlet and a cooling medium outlet of the heat exchanger are connected with a cooling system.
5. The method for treating ammonia gas in cyanuric acid production according to claim 4, wherein: an exhaust port of the ammonia washing tower is connected with a gas inlet of the secondary baffle side wall through an exhaust pipe, a gas outlet at the top of the secondary baffle is connected with an ammonia pipeline, and a discharge port at the bottom of the secondary baffle is connected with a urea tank.
6. The method for treating ammonia gas in cyanuric acid production according to claim 4, wherein: and a cooling pipe connected with a cooling system is arranged at the bottom of the urea tank.
7. The method for treating ammonia gas in cyanuric acid production according to claim 6, wherein: and a cooling pipe connected with a cooling system is arranged at the bottom of the ammonia washing tower.
8. The method for treating ammonia gas in cyanuric acid production according to claim 4, wherein: a liquid level meter and a thermometer are arranged in the urea tank, and a thermometer is arranged on the ammonia gas pipe.
9. The method for treating ammonia gas in cyanuric acid production according to claim 7, wherein: and cooling pipes in the ammonia washing tower and the urea tank are coiled pipes.
10. The method for treating ammonia gas in cyanuric acid production according to any of claims 1 to 9, wherein: the spray pipe is arranged at the top of the inner cavity of the ammonia washing tower, penetrates through a urea inlet and is communicated with a liquid urea pipe, the spray pipe is a coil pipe, and a plurality of spray holes are formed in the lower surface of the spray pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911421094.9A CN110975531A (en) | 2019-12-31 | 2019-12-31 | Ammonia gas treatment method in cyanuric acid production |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911421094.9A CN110975531A (en) | 2019-12-31 | 2019-12-31 | Ammonia gas treatment method in cyanuric acid production |
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| CN110975531A true CN110975531A (en) | 2020-04-10 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1076934A (en) * | 1963-09-27 | 1967-07-26 | Shikoku Kasei Kogyo Company Lt | A process for producing cyanuric acid |
| GB1155907A (en) * | 1967-07-03 | 1969-06-25 | Ici Ltd | Improvements in and relating to The Pyrolysis Of Urea |
| CN2545198Y (en) * | 2002-04-19 | 2003-04-16 | 叶龙声 | Device for producing raw cyanuric acid by direct heating in tube |
| CN202876637U (en) * | 2012-08-01 | 2013-04-17 | 天邦膜技术国家工程研究中心有限责任公司 | Double-tower ammonia washing system for membrane separation treatment |
| CN105524006A (en) * | 2016-01-08 | 2016-04-27 | 山东明辉新材料有限公司 | Energy-saving environment-friendly co-production process of cyanuric acid, food-grade sulfuric acid and sulfamic acid |
| CN109499287A (en) * | 2018-11-23 | 2019-03-22 | 北京润泰环保科技有限公司 | A kind of wet scrubber tower and medical wastes incineration acid gas processing method |
| CN209759347U (en) * | 2019-03-20 | 2019-12-10 | 河北瑞达净水剂科技有限公司 | Pyrolysis oven tail gas urea recovery unit |
-
2019
- 2019-12-31 CN CN201911421094.9A patent/CN110975531A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1076934A (en) * | 1963-09-27 | 1967-07-26 | Shikoku Kasei Kogyo Company Lt | A process for producing cyanuric acid |
| GB1155907A (en) * | 1967-07-03 | 1969-06-25 | Ici Ltd | Improvements in and relating to The Pyrolysis Of Urea |
| CN2545198Y (en) * | 2002-04-19 | 2003-04-16 | 叶龙声 | Device for producing raw cyanuric acid by direct heating in tube |
| CN202876637U (en) * | 2012-08-01 | 2013-04-17 | 天邦膜技术国家工程研究中心有限责任公司 | Double-tower ammonia washing system for membrane separation treatment |
| CN105524006A (en) * | 2016-01-08 | 2016-04-27 | 山东明辉新材料有限公司 | Energy-saving environment-friendly co-production process of cyanuric acid, food-grade sulfuric acid and sulfamic acid |
| CN109499287A (en) * | 2018-11-23 | 2019-03-22 | 北京润泰环保科技有限公司 | A kind of wet scrubber tower and medical wastes incineration acid gas processing method |
| CN209759347U (en) * | 2019-03-20 | 2019-12-10 | 河北瑞达净水剂科技有限公司 | Pyrolysis oven tail gas urea recovery unit |
Non-Patent Citations (1)
| Title |
|---|
| 徐龙君 等主编: "《化工安全工程》", 31 July 2011 * |
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Application publication date: 20200410 |
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