CN114380303B - Ammonia production device and method for thermal power plant - Google Patents
Ammonia production device and method for thermal power plant Download PDFInfo
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- CN114380303B CN114380303B CN202210126480.0A CN202210126480A CN114380303B CN 114380303 B CN114380303 B CN 114380303B CN 202210126480 A CN202210126480 A CN 202210126480A CN 114380303 B CN114380303 B CN 114380303B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/08—Preparation of ammonia from nitrogenous organic substances
- C01C1/086—Preparation of ammonia from nitrogenous organic substances from urea
Abstract
The application belongs to the technical field of pollutant control, and particularly relates to an ammonia production device and method for a thermal power plant. The application provides a device and a method for preparing ammonia in a thermal power plant; the ammonia production device of the thermal power plant comprises a urea feeding pump and a bypass pneumatic valvePneumatic control valve, al 2 O 3 ‑MnO 2 The device comprises a catalytic hydrolysis device, a urease catalytic hydrolysis device and a mechanical compressor; wherein nitrogen oxides NO are generated in the rapid load-increasing stage of the thermal power plant x The amount of the urea is large, the demand for ammonia is large, the hydrolysis rate of the urease catalytic hydrolysis device for hydrolyzing urea can reach more than 1000 times of the hydrolysis rate of common catalytic urea, and therefore the demand for ammonia in a rapid load increasing stage can be met x Short-term standard exceeding of emission, high energy consumption and easy corrosion to an ammonia production device.
Description
Technical Field
The application belongs to the technical field of pollutant control, and particularly relates to an ammonia production device and method for a thermal power plant.
Background
Nitrogen oxides NO produced during combustion in thermal power plants x The emission to the atmosphere can cause air pollution, so the thermal power plant is provided with a urea ammonia production device, and the ammonia gas generated by the urea ammonia production device is used for converting nitrogen oxide NO x Reducing the nitrogen oxide into nitrogen dioxide and water, thereby achieving the control of nitrogen oxide NO x The air pollution is avoided.
However, in addition to steady-state operating conditions, the thermal power plant may also be operated in a short, usually only a few tens of minutes, rapid load ramp-up phase, in which nitrogen oxides NO are produced x The amount of the ammonia is large, the reaction time of the prior urea pyrolysis ammonia preparation and hydrolysis ammonia preparation device is slow, the speed of hydrolyzing ammonia gas is slow, and the ammonia gas can not be quickly preparedResponding to the demand of ammonia gas in the quick load-up stage of the unit, causing the delay of ammonia supply and leading nitrogen oxide NO x Short-term overproof emission; meanwhile, steam, flue gas or other heating forms are needed for the processes of pyrolysis and hydrolysis for ammonia production regardless of urea pyrolysis for ammonia production or urea hydrolysis for ammonia production, and pipelines of ammonia production equipment are easy to corrode due to high moisture content; in addition, the ammonia production device is easy to be corroded in the process of producing ammonia by catalyzing and hydrolyzing certain acid catalysts, and the service life of equipment is shortened.
Disclosure of Invention
In view of the above, the present application provides an ammonia generating device and method for a thermal power plant, which can quickly respond to the demand of ammonia gas of a thermal power unit in a rapid load-increasing stage, and reduce energy consumption and do not corrode the ammonia generating device, thereby solving the problem in the prior art that nitrogen oxide NO is generated due to delayed ammonia supply when the thermal power unit is in an operation condition in the rapid load-increasing stage x The short-term standard exceeding of emission, high energy consumption of hydrolysis ammonia production and easy corrosion of ammonia production devices.
The application provides a thermal power plant system ammonia device in first aspect, thermal power plant system ammonia device includes urea feed pump, bypass pneumatic valve, pneumatic control valve, al 2 O 3 -MnO 2 The device comprises a catalytic hydrolysis device, a urease catalytic hydrolysis device and a mechanical compressor;
a first outlet of the urea feeding pump is connected with an inlet of the pneumatic regulating valve;
the outlet of the pneumatic regulating valve is connected with the inlet of the urease catalytic hydrolysis device;
the outlet of the urease catalytic hydrolysis device and the Al 2 O 3 -MnO 2 Inlet connection for catalytic hydrolysis unit
The second outlet of the urea feeding pump is connected with the inlet of the bypass pneumatic valve;
the outlet of the bypass pneumatic valve is connected with the Al 2 O 3 -MnO 2 The inlet of the catalytic hydrolysis device is connected;
the Al is 2 O 3 -MnO 2 Outlet of catalytic hydrolysis unitIs connected with the inlet of the mechanical compressor.
Preferably, the Al is 2 O 3 -MnO 2 The catalytic hydrolysis device comprises a heat exchange chamber and Al 2 O 3 -MnO 2 Catalyst tube bank, defroster, evaporating chamber and drain.
Preferably, the ammonia plant of the thermal power plant further comprises a urea solution storage tank;
and the outlet of the urea solution storage tank is connected with the inlet of the urea feeding pump.
Preferably, the ammonia plant of the thermal power plant further comprises an outlet pneumatic valve;
the outlet of the pneumatic regulating valve is connected with the inlet of the outlet pneumatic valve, and the outlet of the outlet pneumatic valve is connected with the inlet of the urease catalytic hydrolysis device.
Preferably, the thermal power plant ammonia production device further comprises a dilution fan;
and the outlet of the dilution fan is connected with the outlet of the heat exchange chamber.
Preferably, the ammonia plant of the thermal power plant further comprises a steam generator;
the outlet of the steam generator is connected with the inlet of the heat exchange chamber.
Preferably, the ammonia plant of the thermal power plant further comprises a urea solution circulating pump;
the inlet of the urea solution circulating pump is connected with the outlet of the evaporation chamber;
an outlet of the urea solution circulating pump and the Al 2 O 3 -MnO 2 The top of the catalytic hydrolysis device is connected.
It should be noted that the urea solution circulating pump can make part of the urea solution which is not hydrolyzed pass through Al 2 O 3 -MnO 2 The catalytic hydrolysis unit is hydrolyzed again.
Preferably, the ammonia plant of the thermal power plant further comprises a distilled water pump;
the inlet of the distilled water pump is connected with the Al 2 O 3 -MnO 2 An outlet of the catalytic hydrolysis unit;
and the outlet of the distilled water pump is connected with the inlet of the urea solution storage tank.
The second aspect of the application provides a method for preparing ammonia gas by using the ammonia production device of the thermal power plant, which comprises the following steps:
opening the bypass pneumatic valve and passing the urea solution through Al via the urea feed pump 2 O 3 -MnO 2 A catalytic hydrolysis unit;
opening a pneumatic regulating valve, and enabling the urea solution to flow through a urea enzyme catalytic hydrolysis device through a urea feeding pump;
and starting the mechanical compressor, and compressing the product gas generated by hydrolysis of the urea solution urease catalytic hydrolysis device.
It is noted that the method for preparing ammonia provided by the application generates nitrogen oxides NO in the rapid load-increasing stage of a thermal power plant x When the demand for ammonia gas is large, the urea solution flows through a urease catalytic hydrolysis device, can be hydrolyzed at normal temperature to generate product gas such as ammonia gas, carbon dioxide, water vapor and the like, then a mechanical compressor starts to compress the product gas, and the liquefied latent heat in the product gas is utilized to heat Al connected with the mechanical compressor 2 O 3 -MnO 2 Catalytic hydrolysis device, thereby reducing heating and catalyzing Al in steam, smoke or other heating forms 2 O 3 -MnO 2 Energy consumption in catalytic hydrolysis units.
Preferably, the method for preparing ammonia further comprises the steps of:
opening a bypass pneumatic valve to flow desalted water through Al 2 O 3 -MnO 2 A catalytic hydrolysis unit;
starting a urea solution circulating pump to remove the desalted water in Al 2 O 3 -MnO 2 Internal circulation of the catalytic hydrolysis device;
starting the steam generator to Al 2 O 3 -MnO 2 Steam is injected into the catalytic hydrolysis unit.
In summary, the present application provides an ammonia plant apparatus and method; the ammonia production device of the thermal power plant comprises a urea feeding pump, a bypass pneumatic valve, a pneumatic regulating valve and Al 2 O 3 -MnO 2 The device comprises a catalytic hydrolysis device, a urease catalytic hydrolysis device and a mechanical compressor; wherein nitrogen oxides NO are generated in the rapid load-increasing stage of the thermal power plant x The urea hydrolysis speed of the urease catalytic hydrolysis device can reach more than 1000 times of the hydrolysis speed of the common catalytic urea, so that the demand of the ammonia at a rapid load increasing stage can be met, and compared with the method for preparing the ammonia by hydrolyzing the urea by using a catalyst, the urease can catalyze the urea to generate the ammonia at normal temperature, so that the energy consumption is greatly reduced; at the same time, al 2 O 3 -MnO 2 The catalytic hydrolysis device and the urease catalytic hydrolysis device cannot corrode ammonia production equipment; and the product gas generated by urea hydrolysis is compressed again by the mechanical compressor to form high-temperature and high-pressure gas, and the latent heat released by liquefaction of more than 40% of moisture in the product gas is utilized to heat the urea solution, so that not only is the energy consumption of the system greatly reduced, but also the moisture content in the product gas can be reduced, and the blockage and corrosion of subsequent pipelines are reduced. Therefore, the ammonia production device for the thermal power plant solves the problem of nitrogen oxide NO appearing in the rapid load increasing stage of the thermal power plant x Short-term standard exceeding of emission, high energy consumption and easy corrosion to an ammonia production device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an ammonia plant of a thermal power plant provided in embodiment 1 of the present application;
wherein the reference numerals are: 1: a urea solution storage tank; 2: a urea feed pump; 3: a bypass pneumatic valve; 4: a pneumatic regulating valve; 5: a urease catalytic hydrolysis device; 6: an outlet pneumatic valve; 7: a dilution fan; 8: a heat exchange chamber: 9: al (Al) 2 O 3 -MnO 2 Catalyst tubeBundling; 10: al (Al) 2 O 3 -MnO 2 A catalytic hydrolysis unit; 11: a demister; 12: an evaporation chamber; 13: a steam generator; 14: a mechanical compressor; 15: a urea solution circulating pump; 16: a sewage draining outlet; 17: a distilled water pump.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The reagents or raw materials used in the following examples are commercially available or self-made.
Example 1
This example 1 provides a first ammonia plant, including a urea solution storage tank; a urea feed pump; a bypass pneumatic valve; a pneumatic regulating valve; a urease catalytic hydrolysis device; an outlet pneumatic valve; a dilution fan; a heat exchange chamber: al (Al) 2 O 3 -MnO 2 A catalyst tube bundle; al (Al) 2 O 3 -MnO 2 A catalytic hydrolysis unit; a demister; an evaporation chamber; a steam generator; a mechanical compressor; a urea solution circulating pump; a sewage draining outlet; a distilled water pump; wherein, each part connection relation of this ammonia plant is: the outlet of the urea solution storage tank is connected with the inlet of a urea feeding pump, the urea feeding pump is connected with the inlet of the urease catalytic hydrolysis device through an inlet pneumatic control valve, and the other path of the urea feeding pump directly sends urea solution into Al through a bypass pneumatic valve 2 O 3 -MnO 2 In the evaporation chamber of the catalytic hydrolysis device, the outlet of the urease catalytic hydrolysis device passes through an outlet pneumatic valve and Al 2 O 3 -MnO 2 The inlet of the evaporation chamber of the catalytic hydrolysis device is connected, and the urease catalytic hydrolysis device Al 2 O 3 -MnO 2 The outlet of the evaporation chamber of the catalyst hydrolysis device is connected with the inlet of a urea solution circulating pump, and the outlet of the urea solution circulating pump is connected with Al 2 O 3 -MnO 2 The top of the catalytic hydrolysis device is connected,Al 2 O 3 -MnO 2 a sewage draining outlet is arranged at the bottom of the catalytic hydrolysis device; al (Al) 2 O 3 -MnO 2 The product gas generated in the evaporating chamber of the catalytic hydrolysis device passes through a demister and then enters a mechanical compressor, and the outlet of the mechanical compressor, the outlet of a steam generator and Al 2 O 3 -MnO 2 The inlet of a heat exchange chamber of the catalytic hydrolysis device is connected, the outlet of the heat exchange chamber is connected with the outlet of the dilution fan, and the product gas is mixed with hot air generated by the dilution fan and then sent to a denitration ammonia injection system; high-temperature hydrophobic water generated after the steam in the heat exchange chamber is liquefied is connected with a coil pipe of the urea dissolving tank through a distilled water pump, and distilled water can be recycled after heat exchange.
Example 2
This embodiment 2 provides the control technology of above-mentioned thermal power plant's ammonia plant, including system preheating, mechanical type compressor start, throw urea solution system normal operating, operating condition adjustment.
Wherein the system preheating comprises:
1) Injecting desalted water into the urea dissolving tank, opening a bypass pneumatic valve, and injecting the desalted water into Al 2 O 3 -MnO 2 In the evaporation chamber of the catalytic hydrolysis device.
2) Starting a urea solution circulating pump to remove the desalted water in Al 2 O 3 -MnO 2 The inside of the catalytic hydrolysis device is circulated.
3) Starting a steam generator, injecting steam into the heat exchange chamber, and allowing the steam in the heat exchange chamber to react with Al 2 O 3 -MnO 2 The demineralized water in the catalyst tube bundle is heated, the temperature of the demineralized water in the evaporation chamber is raised to about 160 ℃, and the pressure is raised to about 0.6 Mpa.
4) And (4) conveying the hydrophobic water subjected to the heat exchange of the steam in the heat exchange chamber to a coil of a urea dissolving tank through a distilled water pump, and heating desalted water to 35-40 ℃ until the system is preheated.
The mechanical compressor start-up includes:
1) After preheating, the compressor is started, steam generated by the evaporation chamber is sucked, high-temperature and high-pressure steam with the temperature of 170 ℃ and the pressure of 0.8Mpa is formed by applying work, meanwhile, the steam generator is closed, and the high-temperature and high-pressure steam supplied by the compressor is used as a heat source for supplying heat.
2) Injecting high-temperature high-pressure steam generated at the outlet of the compressor into the heat exchange chamber to carry out heat exchange on Al 2 O 3 -MnO 2 Heating the desalted water in the catalyst tube bundle, adjusting the output of a compressor, maintaining the temperature of the desalted water at about 160 ℃ and the pressure at about 0.6Mpa, draining water normally, and finishing the starting of the compressor.
The normal operation of the urea solution feeding system comprises the following steps:
1) The urea dissolving tank 1 was prepared to 50% by weight of urea solution, the bypass pneumatic valve was opened, and the urea solution was injected into Al 2 O 3 -MnO 2 In the evaporation chamber of the catalytic hydrolysis device.
2) Injecting the urea solution in the evaporation chamber into Al through a circulating pump 2 O 3 -MnO 2 Catalytic hydrolysis unit top, and passing through Al 2 O 3 -MnO 2 Catalyst tube bundle, al 2 O 3 -MnO 2 The catalyst tube bundle was 50% Al 2 O 3 And 50% MnO 2 The mixed solid catalyst of (1). Under the action of a catalyst, the urea solution is rapidly hydrolyzed to generate ammonia and carbon dioxide, in order to ensure the catalytic effect, the space velocity ratio of the solution flow to the solid volume of the catalyst is controlled to be 1.0-2.5h < -1 >, and the urea hydrolysis reaction steps are as follows:
CO(NH 2 ) 2 +H 2 O→NH 4 COONH 2 ΔH 1 ＝-15.5kJ/mol
NH 4 COONH 2 →2NH 3 +CO 2 ΔH 2 ＝+177kJ/mol
the first reaction step produces intermediate ammonium carbamate, which is a slightly exothermic reaction, and the second reaction step produces the final products ammonia and carbon dioxide, which are strongly endothermic and therefore require the supply of sufficient heat.
3) From Al in the urea solution after catalytic hydrolysis 2 O 3 -MnO 2 The catalyst tube bundle descends into the evaporation chamber, the evaporation chamber provides enough gas-liquid contact area, the gas-liquid mass transfer process is completed in the evaporation chamber, and ammonia gas (37) is generated.50 percent of carbon dioxide (18.75 percent) and water vapor (43.75 percent) as main product gas, the reaction temperature is controlled to be about 160 ℃, and the reaction pressure is controlled to be about 0.6 Mpa. The product gas enters the compressor after being subjected to liquid drop removal by the demister.
4) The product gas is compressed by a compressor to generate high-temperature and high-pressure gas with the temperature of 170 ℃ and the pressure of about 0.6Mpa, and the high-temperature and high-pressure gas is used as a heat source to enter a heat exchange chamber, and because the boiling point difference of water vapor, ammonia gas and carbon dioxide is large (under the standard atmospheric pressure, the boiling point of water: 100 ℃, boiling point of ammonia: -33.4 ℃, boiling point of carbon dioxide: 78.5 ℃), so that during heat exchange, the water vapor liquefies and releases latent heat to heat Al 2 O 3 -MnO 2 The urea solution in the catalyst tube bundle is hydrophobic, and the ammonia gas and the carbon dioxide are still formed in a gaseous state to be used as a product gas (at the moment, the product gas mainly comprises 66.7 percent of ammonia gas and 33.3 percent of carbon dioxide) and hot air generated by a dilution fan are mixed and then sent to a denitration ammonia injection system. Adjusting the output of the compressor, and maintaining the temperature of the urea solution at about 160 ℃ and the pressure at about 0.6 MPa.
5) And (3) transferring hydrophobic water formed after heat exchange of water in the product gas in the heat exchange chamber to a coil of the urea dissolving tank through a distilled water pump, and heating the urea solution to 35-40 ℃ until the system normally operates.
The operation condition adjustment comprises the following steps:
1) When the unit is not in the rapid load-increasing stage, the system operation mode does not need to be changed, namely the Al directly enters the aluminum by a bypass without passing through a urease catalytic hydrolysis device 2 O 3 -MnO 2 The catalytic hydrolysis device is used for hydrolyzing to produce ammonia gas, the power of the compressor is basically unchanged, the evaporation chamber is in a gas-liquid equilibrium state, and the concentration of each component of the gas-liquid two-phase is basically unchanged.
2) When the unit is in a rapid load-increasing stage, the ammonia demand is rapidly increased, the output of the compressor 14 is increased in order to keep pressure balance, the evaporation chamber is in a gas-liquid imbalance state at the moment, the urea hydrolysis reaction rate is low, the generation rate of ammonia is lower than the evaporation rate of moisture, the ammonia content in product gas is reduced, and sufficient ammonia cannot be effectively supplied. At the moment, the inlet pneumatic regulating valve and the outlet pneumatic valve are adjusted, a part of urea solution is distributed to pass through the urease catalytic hydrolysis device, a catalytic layer of the urease catalytic hydrolysis device is immobilized urease, in order to guarantee the catalytic effect, the airspeed is controlled to be 1.0-2.5h < -1 >, the urea hydrolysis reaction rate is rapidly promoted through the urease catalytic action, and enough ammonia gas can be generated to meet the ammonia gas requirement of a unit in the rapid load increasing stage.
3) When the unit is switched from the rapid load-increasing stage to the steady-state stage, the inlet pneumatic regulating valve is gradually closed until the inlet pneumatic regulating valve is completely closed, and the gas and the liquid in the evaporation chamber gradually reach a new equilibrium state, so that the ammonia gas is stably produced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The ammonia production device of the thermal power plant is characterized by comprising a urea feeding pump, a bypass pneumatic valve, a pneumatic regulating valve and Al 2 O 3 -MnO 2 The device comprises a catalytic hydrolysis device, a urease catalytic hydrolysis device and a mechanical compressor;
a first outlet of the urea feeding pump is connected with an inlet of the pneumatic regulating valve;
the outlet of the pneumatic regulating valve is connected with the inlet of the urease catalytic hydrolysis device;
the outlet of the urease catalytic hydrolysis device and the Al 2 O 3 -MnO 2 The inlet of the catalytic hydrolysis device is connected;
the second outlet of the urea feeding pump is connected with the inlet of the bypass pneumatic valve;
the outlet of the bypass pneumatic valve is connected with the Al 2 O 3 -MnO 2 The inlet of the catalytic hydrolysis device is connected;
the Al is 2 O 3 -MnO 2 The outlet of the catalytic hydrolysis device is connected with the inlet of the mechanical compressor.
2. The thermal power plant ammonia plant of claim 1, wherein the Al is 2 O 3 -MnO 2 The catalytic hydrolysis device comprises a heat exchange chamber and Al 2 O 3 -MnO 2 Catalyst tube bank, defroster, evaporating chamber and drain.
3. The thermal power plant ammonia plant of claim 1, further comprising a urea solution storage tank;
and the outlet of the urea solution storage tank is connected with the inlet of the urea feeding pump.
4. The thermal power plant ammonia generating device of claim 2, further comprising an outlet pneumatic valve;
the outlet of the pneumatic control valve is connected with the inlet of the outlet pneumatic valve, and the outlet of the outlet pneumatic valve is connected with the inlet of the urease catalytic hydrolysis device.
5. The thermal power plant ammonia plant of claim 2, further comprising a dilution fan;
and the outlet of the dilution fan is connected with the outlet of the heat exchange chamber.
6. The thermal power plant ammonia plant of claim 2, further comprising a steam generator;
the outlet of the steam generator is connected with the inlet of the heat exchange chamber.
7. The thermal power plant ammonia plant of claim 2, further comprising a urea solution circulation pump;
the inlet of the urea solution circulating pump is connected with the outlet of the evaporation chamber;
an outlet of the urea solution circulating pump and the Al 2 O 3 -MnO 2 The top of the catalytic hydrolysis device is connected.
8. The thermal power plant ammonia plant of claim 3, further comprising a distilled water pump;
the inlet of the distilled water pump is connected with the Al 2 O 3 -MnO 2 An outlet of the catalytic hydrolysis unit;
and the outlet of the distilled water pump is connected with the inlet of the urea solution storage tank.
9. The method for preparing ammonia gas by the ammonia plant of the thermal power plant as defined in any one of claims 1 to 8, which is characterized by comprising the following steps: opening the bypass pneumatic valve and passing the urea solution through Al via the urea feed pump 2 O 3 -MnO 2 A catalytic hydrolysis unit;
opening a pneumatic regulating valve, and enabling the urea solution to flow through a urea enzyme catalytic hydrolysis device through a urea feeding pump;
and starting a mechanical compressor, and compressing product gas generated by hydrolysis of the urea solution urease catalytic hydrolysis device.
10. The method for preparing ammonia gas by the ammonia plant of the thermal power plant as set forth in claim 9, further comprising the steps of:
the bypass pneumatic valve is opened, and the desalted water is led to flow through Al 2 O 3 -MnO 2 A catalytic hydrolysis unit;
starting a urea solution circulating pump to remove the desalted water in Al 2 O 3 -MnO 2 Internal circulation of the catalytic hydrolysis device;
starting the steam generator to Al 2 O 3 -MnO 2 Steam is injected into the catalytic hydrolysis unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002068734A (en) * | 2000-08-24 | 2002-03-08 | Mitsubishi Heavy Ind Ltd | Method for producing ammonia and method for treating exhaust gas |
| CN103011366B (en) * | 2012-12-14 | 2013-12-25 | 太原理工大学 | Method of carrying out catalytic hydrolysis on low-concentration urea wastewater by solid catalyst |
| CN106621740A (en) * | 2017-03-15 | 2017-05-10 | 上海龙净环保科技工程有限公司 | Catalytic hydrolysis ammonia producing system and method by using urea with waste heat |
| CN215048698U (en) * | 2021-02-05 | 2021-12-07 | 陕西大秦环境科技有限公司 | Accurate ammonia injection device for preparing ammonia by catalytic hydrolysis of urea |
| CN113926385A (en) * | 2021-10-25 | 2022-01-14 | 上海洁昊环保股份有限公司 | Equipment and method for preparing ammonia by catalytic pyrolysis of urea |
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