CN212712775U - System for preparing ammonia by pyrolyzing urea with blast furnace gas - Google Patents
System for preparing ammonia by pyrolyzing urea with blast furnace gas Download PDFInfo
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- CN212712775U CN212712775U CN202020883156.XU CN202020883156U CN212712775U CN 212712775 U CN212712775 U CN 212712775U CN 202020883156 U CN202020883156 U CN 202020883156U CN 212712775 U CN212712775 U CN 212712775U
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Abstract
The utility model discloses an ammonia production system by utilizing blast furnace gas to pyrolyze urea, which comprises a pyrolyzing furnace for pyrolyzing urea and a heating furnace for burning blast furnace gas, wherein the heating furnace is communicated with an air inlet of the pyrolyzing furnace; the gas outlet of the pyrolysis furnace is connected with an ammonia spraying grid on a gas inlet flue of the denitration reactor; and the gas outlet of the denitration reactor is connected with the heat exchanger. The principle of the utility model lies in that the blast furnace gas is heated by the heating furnace and then is conveyed to the pyrolyzing furnace to decompose the urea solution to prepare ammonia gas; the prepared ammonia gas is directly conveyed to an ammonia injection grid in front of the denitration reactor, and is mixed with the flue gas to be denitrated and enters the denitration reactor for denitration.
Description
Technical Field
The utility model relates to an ammonia production system, in particular to a system for producing ammonia by pyrolyzing urea with blast furnace gas.
Background
Ammonia (Ammonia, i.e. amonia), a compound of nitrogen and hydrogen, of the formula NH3, is a colourless gas with a strong irritating odour. Is very easy to dissolve in water, and 1 volume of water can dissolve 700 times volume of ammonia at normal temperature and normal pressure, and the water solution is also called ammonia water. The liquid ammonia is a refrigerant. Ammonia is also an important raw material for manufacturing nitric acid, fertilizers and explosives. Ammonia is of considerable importance to living beings on earth, and is an important component of many foods and fertilizers. Ammonia is also a direct or indirect component of all drugs. Ammonia has a wide range of uses, and it also has hazardous properties such as corrosiveness. Because of its widespread use, ammonia is one of the most abundant inorganic compounds in the world, and more than eighty percent of ammonia is used in the manufacture of fertilizers.
Urea, also known as carbamide (carbomide), is an organic compound consisting of carbon, nitrogen, oxygen, and hydrogen, which is a white crystal. The urea is a raw material for producing ammonia, the existing ammonia production by urea pyrolysis adopts an electric heater to heat secondary air, the power of the electric heater is very high, a large amount of heat energy needs to be consumed, and the operation cost is high.
A blast furnace is a metallurgical facility in which iron ore, coke, and a flux (limestone) for slag formation are charged from the top of the furnace, and preheated air is blown through tuyeres located along the periphery of the furnace at the lower portion of the furnace. Carbon in coke (some blast furnaces also blow auxiliary fuel such as coal dust, heavy oil, natural gas and the like) at high temperature is combusted with oxygen blown into air to generate carbon monoxide and hydrogen, and oxygen in iron ore is removed in the ascending process in the furnaces, so that iron is obtained by reduction. Blast furnace gas contains a large amount of combustible substances, cannot be directly discharged, and can be discharged into the atmosphere after desulfurization and denitrification. The combustible materials are not fully utilized, and waste is caused to a certain extent.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a blast furnace gas pyrolysis urea system ammonia utilizes blast furnace gas heat of burning to heat the pyrolysis oven.
For solving the above technical problem, the technical scheme of the utility model is that: a system for preparing ammonia by pyrolyzing urea with blast furnace gas comprises a pyrolysis furnace for pyrolyzing urea and a heating furnace for burning the blast furnace gas, wherein the heating furnace is communicated with a gas inlet of the pyrolysis furnace; the gas outlet of the pyrolysis furnace is connected with an ammonia spraying grid on a gas inlet flue of the denitration reactor; and the gas outlet of the denitration reactor is connected with the heat exchanger. The utility model discloses a principle lies in utilizing the heating furnace to carry to the pyrolysis oven after burning the heating to blast furnace gas and decomposing the preparation ammonia to urea solution. The prepared ammonia gas is directly conveyed to an ammonia injection grid in front of the denitration reactor, and is mixed with the flue gas to be denitrated and enters the denitration reactor for denitration.
As an improvement, the heating furnace is provided with a booster fan used for pressurizing blast furnace gas in front. Increasing the temperature of blast furnace gas at low pressure to 7-13 KPa.
As an improvement, the device also comprises a blower for supplying oxygen to the heating furnace. Fresh air is introduced to increase the oxygen content and promote the combustion of blast furnace gas.
Preferably, a high-temperature fan is arranged between the heating furnace and the pyrolysis furnace. And conveying the high-temperature flue gas in the heating furnace to a pyrolysis furnace through a high-temperature fan to pyrolyze the urea solution.
As an improvement, the heat exchanger is a rotary heat exchanger; comprises a raw smoke chamber, a smoke purifying chamber and a rotary heat exchange center; the denitration reactor is connected with an air inlet of the smoke purifying chamber. The temperature of the denitrated flue gas is 250-350 ℃, and a large amount of waste heat can be utilized. And the heat in the denitration flue gas is used for heating the saturated wet flue gas of the wet desulphurization absorption tower or the saturated wet flue gas of the wet electric dust collector through the heat exchanger.
Preferably, the raw flue gas chamber is connected with the gas outlet of the wet desulphurization absorption tower or the gas outlet of the wet electric dust collector.
The utility model discloses an useful part lies in: the urea pyrolysis ammonia production system with the structure utilizes heat generated by combustion of blast furnace gas to replace electric heating to carry out pyrolysis on urea solution so as to prepare ammonia. The problems of high power and large electric energy consumption of the electric heater are solved, the problems of pollution and waste caused by incomplete combustion of the blast furnace gas are solved, two purposes are achieved, and the economic benefit is improved.
Drawings
Fig. 1 is a schematic diagram of the present invention.
The labels in the figure are: the system comprises a pyrolysis furnace 1, a heating furnace 2, a denitration reactor 3, an ammonia spraying grid 4, a smoke purifying chamber 5, an additional fan 6, an air blower 7, a high-temperature fan 8 and a raw smoke chamber 9.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the specific embodiments.
As shown in fig. 1, the utility model comprises a pyrolysis furnace 1 for pyrolyzing urea, and a heating furnace 2 for burning blast furnace gas, wherein the heating furnace 2 is communicated with an air inlet of the pyrolysis furnace 1; the gas outlet of the pyrolysis furnace 1 is connected with the denitration reactor 3, and the gas outlet of the pyrolysis furnace 1 is connected with an ammonia spraying grid 4 on a gas inlet flue of the denitration reactor 3; and the air outlet of the denitration reactor 3 is connected with the heat exchanger.
The heating furnace 2 is preceded by a booster fan 6 for pressurizing the blast furnace gas. A blower 7 for supplying oxygen to the heating furnace 2 is also included. A high-temperature fan 8 is arranged between the heating furnace 2 and the pyrolysis furnace 1. Control valves are arranged at the inlet and the outlet of the booster fan 6, the blower 7 and the high-temperature fan 8, and temperature, flow and pressure detection meters are arranged on the inlet and the outlet pipelines of the pyrolysis furnace 1.
When the furnace works, the blast furnace gas from the blast furnace is pressurized to 7-13 KPa by the booster fan 6 and then enters the heating furnace 2 for combustion. The blower 7 mixes fresh air into the heating furnace 2 to provide oxygen for combustion assistance, and the temperature of flue gas after combustion is 500-650 ℃. The high temperature fan 8 introduces the burned flue gas into the pyrolysis furnace 1 as a heat source to pyrolyze the urea solution into ammonia gas. The pyrolyzed ammonia gas is sent into an ammonia injection grid 4 in a flue at the front end of the denitration reactor 3 to be mixed with the flue gas to be denitrated. And mixing and then entering a denitration reactor 3 for denitration. The temperature of the denitrated flue gas is between 250 and 350 ℃. The denitrated flue gas enters a flue gas purification chamber 5 of the heat exchanger, exchanges heat with the saturated wet flue gas of the wet desulphurization absorption tower in the original flue gas chamber 9 or the saturated wet flue gas of the wet electric dust collector, and then enters a chimney for emission.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.
Claims (6)
1. The utility model provides an utilize blast furnace gas pyrolysis urea ammonia production system, includes the pyrolysis oven that is used for carrying out the pyrolysis with urea which characterized in that: the device also comprises a heating furnace for burning blast furnace gas, wherein the heating furnace is communicated with the gas inlet of the pyrolysis furnace; the gas outlet of the pyrolysis furnace is connected with an ammonia spraying grid on a gas inlet flue of the denitration reactor; and the gas outlet of the denitration reactor is connected with the heat exchanger.
2. The system for producing ammonia by pyrolyzing urea with blast furnace gas according to claim 1, wherein: a booster fan used for pressurizing blast furnace gas is arranged in front of the heating furnace.
3. The system for producing ammonia by pyrolyzing urea with blast furnace gas according to claim 1, wherein: the device also comprises a blower for supplying oxygen to the heating furnace.
4. The system for producing ammonia by pyrolyzing urea with blast furnace gas according to claim 1, wherein: and a high-temperature fan is arranged between the heating furnace and the pyrolysis furnace.
5. The system for producing ammonia by pyrolyzing urea with blast furnace gas according to claim 1, wherein: the heat exchanger is a rotary heat exchanger; comprises a raw smoke chamber, a smoke purifying chamber and a rotary heat exchange center; the denitration reactor is connected with an air inlet of the smoke purifying chamber.
6. The system for producing ammonia by pyrolyzing urea with blast furnace gas according to claim 5, wherein: and the raw smoke chamber is connected with the gas outlet of the wet desulphurization absorption tower or the gas outlet of the wet electric dust collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020883156.XU CN212712775U (en) | 2020-05-22 | 2020-05-22 | System for preparing ammonia by pyrolyzing urea with blast furnace gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020883156.XU CN212712775U (en) | 2020-05-22 | 2020-05-22 | System for preparing ammonia by pyrolyzing urea with blast furnace gas |
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| CN212712775U true CN212712775U (en) | 2021-03-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116792774A (en) * | 2023-06-21 | 2023-09-22 | 四川君和环保股份有限公司 | Flue gas deoxidizing device and flue gas deoxidizing method |
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2020
- 2020-05-22 CN CN202020883156.XU patent/CN212712775U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116792774A (en) * | 2023-06-21 | 2023-09-22 | 四川君和环保股份有限公司 | Flue gas deoxidizing device and flue gas deoxidizing method |
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