Urea hydrolysis ammonia production system

Abstract

The utility model discloses a urea hydrolysis ammonia production system which comprises a data processing system and processing equipment, the data processing system comprises a solid storage module, and the solid storage module is electrically connected with a feeding module. When the temperature of the urea solution is too low, the heating device is started to provide heat needed for preparing the saturated urea solution and prevent urea crystallization under specific concentration, and in the using process of the dissolving tank, the dissolving pump circulates the urea solution from the bottom of the dissolving tank to the side portion of the dissolving tank, so that the urea solution is better dissolved and mixed; meanwhile, the mixed solution can be conveyed into the storage tank.

Description

Technical Field

[0001] The utility model relates to the technical field of urea hydrolysis to produce ammonia, in particular to a urea hydrolysis to produce ammonia system. Background Art

[0002] During the use of the existing urea hydrolysis ammonia production system, it is difficult to change the heating power of the heating device by adjusting the gas flow rate when heating the flowing ammonia. When the gas flow rate is fast, if the heating power is small, the temperature will not reach the expected temperature, thereby reducing the production quality. When the gas flow rate is slow, if the heating power is large, the temperature will be too high, thereby causing damage. At the same time, during the use of the existing urea hydrolysis ammonia production system, the wastewater generated after hydrolysis in the hydrolyzer is low in recycling rate, which is a waste of resources. Therefore, it is very necessary to design a urea hydrolysis ammonia production system that improves production efficiency and production quality. Utility Model Content

[0003] The purpose of the present invention is to provide a urea hydrolysis ammonia production system to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: A urea hydrolysis ammonia production system, including a data processing system and processing equipment, the data processing system including a solid storage module, the solid storage module is electrically connected to a feeding module, the feeding module is electrically connected to a dissolution module, the dissolution module is electrically connected to a liquid storage module, the liquid storage module is electrically connected to a hydrolysis ammonia production module, the hydrolysis ammonia production module is electrically connected to a hydrophobic module, the hydrophobic module is electrically connected to an injection module, the injection module is electrically connected to a dilution air module, the dilution air module is electrically connected to an ammonia metering module, the ammonia metering module is electrically connected to an eyewash shower module, the eyewash shower module is electrically connected to a heating module, the heating module is electrically connected to a wastewater module, and the wastewater module is electrically connected to a skid-mounted module.

[0005] According to the above technical solution, the feeding module includes a bucket elevator, the dissolution module includes a dissolution tank, the liquid storage module includes a storage tank, the hydrolysis ammonia production module is electrically connected to the hydrolyzer, the hydrophobic module includes a hydrophobic tank, the wastewater module includes a water flushing device, the heating module includes a steam heating pipe, the eyewash shower module includes a wash basin and an eyewash, the ammonia metering module includes a flow regulating pipeline, the dilution air module is electrically connected to the dilution fan, and the injection module includes an injection device.

[0006] According to the above technical solution, the skid-mounted module is electrically connected to a cleaning and purging device, a safety protection device, a steam heating pipe, and a catalyst adding device. The safety protection device includes but is not limited to shutting off steam input, releasing the gas phase pressure in the hydrolyzer, releasing the liquid phase solution in the hydrolyzer, tripping the safety valve, blasting the bursting disc, etc., which can protect the equipment and operators during use. The cleaning and purging device cleans the pipeline during the use of the hydrolyzer, and the steam heating pipe maintains a certain temperature during the use of the hydrolyzer to meet its production needs. The catalyst adding device is a mobile and simple device, including a catalyst box, a catalyst pump, a Y-type filter, an agitator, all valves and pipes connected to the equipment body, a thermometer, a liquid level gauge, etc. A certain amount of catalyst is added during the use of the hydrolyzer, thereby improving the production efficiency of the device. The outlet of the hydrolyzer is equipped with a secondary steam-water separation device, a primary cyclone separation, and a secondary corrugated plate, thereby reducing the water content in the finished ammonia gas.

[0007] The processing equipment includes a pneumatic conveying device, the pneumatic conveying device is connected to a bucket elevator, the bucket elevator is connected to a dissolving tank, the dissolving tank is connected to a dissolving pump, the dissolving pump is connected to a storage tank, the storage tank is connected to a delivery pump, the delivery pump is connected to a hydrolyzer, the hydrolyzer is connected to a drain pump, the drain pump is connected to a drain tank, the drain tank is connected to an injection device, the injection device is connected to a flow regulating valve, the flow regulating valve is connected to an ammonia / air mixer, the ammonia / air mixer is connected to a dilution fan, and the dilution fan is connected to a flow regulating valve. The regulating pipeline is connected to a wash basin and an eyewash station, and the wash basin and the eyewash station are connected to a steam heating pipeline, and the steam heating pipeline is connected to a water flushing device; the ammonia / air mixer is connected to the dilution fan pipeline, and the volume ratio concentration of the gas ammonia at the outlet is less than 5%, and the equipment and the external interface are flange-connected; the injection device pipeline is connected to the flow regulating valve pipeline, and the amount of ammonia and air mixed gas can be adjusted according to different working conditions of the flue gas. The injection device has good thermal expansion, thermal deformation resistance and vibration resistance, and an anti-blocking device is installed inside the injection device to avoid blockage of the injection device.

[0008] According to the above technical solution, the solid storage module controls the storage of urea, and the feeding device drives the bucket elevator to lift the urea under the control of the solid storage module to the top of the dissolution tank; the dissolution module drives the dissolution tank to dissolve the urea, and the dissolution pump inside the dissolution tank circulates the liquid in the tank, and at the same time, the dissolved solution is transported into the storage tank controlled by the storage module through the dissolution pump; the storage module controls the delivery pump to transport the internal solution into the hydrolyzer controlled by the hydrolysis and ammonia production module, and the hydrolyzer vaporizes the ammonia in the solution; during the operation of the dissolution module, the liquid storage module and the hydrolysis and ammonia production module, the evaporated hydrophobicity will be recovered by the hydrophobic module, and the recovered water flows back to the dissolution tank for circulation. Recyclable wastewater is treated through the wastewater module; during the use of the hydrolyzer, dissolution tank and storage tank, the heating module keeps the solution and ammonia therein at a certain temperature to avoid crystallization; during the ammonia production process, the eyewash shower module controls the movement of the wash basin and eyewash according to the position of the operator, thereby protecting the operator; the ammonia metering module calculates and adjusts the flow rate of ammonia, and at the same time adjusts the processing power of the heating device according to the flow rate of ammonia when the ammonia flows; the dilution air module controls the ammonia / air mixer to mix air and ammonia and control the concentration, thereby diluting the ammonia; the injection module injects the prepared ammonia.

[0009] According to the above technical solution, the dissolving tank is equipped with a bucket elevator to transport urea granules to the top of the urea dissolving tank to meet the configuration amount of the dissolving tank. The dissolving tank includes a stirring device, a heating device, a proportioning device and a dissolving pump. The proportioning device uses desalted water and dry urea to prepare a 50% urea solution. The stirring device is equipped with an impeller to stir the solution during use. When the temperature of the urea solution is too low, the heating device is started to provide the heat required to prepare a saturated urea solution to prevent urea crystallization at a specific concentration. During the use of the dissolving tank, the dissolving pump circulates the urea solution from the bottom to the side of the dissolving tank to better dissolve and mix the urea solution. At the same time, the mixed solution can be transported into the storage tank.

[0010] According to the above technical solution, the urea solution with a concentration of about 50% in the storage tank is transported to the hydrolyzer, and saturated steam enters the hydrolyzer through a coil. The saturated steam does not mix with the urea solution and refluxes through the coil. The condensed water is recovered by the drain tank and the drain pump. The concentration of the urea solution in the hydrolysis reactor reaches 50%, the pressure of the gas-liquid two-phase equilibrium system is about 0.4-0.6 MPa, and the temperature is about 140-160°C. The ammonia-containing gas produced in the hydrolysis reactor is diluted with hot dilution air at the ammonia-air mixer and finally enters the ammonia-flue gas mixing system. Two hydrolyzers are set, and the capacity of each hydrolyzer is 120% of the ammonia supply of the two units under BMCR operating conditions, that is, the ammonia production capacity of each hydrolyzer (when no catalyst is added) is not less than 360 kg / h, and each hydrolyzer is supplied through a skid-mounted module.

[0011] According to the above technical solution, when the processing equipment is in use, the evaporated water from the hydrolyzer, dissolution tank, and solution storage tank is recovered to the drain tank. The drain tank collects the water for use as water for dissolving urea particles and flushing water for pipes. Under normal operating conditions, the excess water is uniformly transported to the water flushing device connected to the wastewater module through the drain pump, and then discharged into the wastewater treatment station through the wastewater pump. A steam cooling and pressure reduction device is installed in the drain tank, and the steam cooling and pressure reduction device includes a pressure reduction module, a temperature reduction module, a pipeline and supporting accessories. The pressure reduction module is electrically connected to a pressure reducing valve, and the temperature reduction device is electrically connected to an adjustable nozzle, a throttle valve, a safety valve and a temperature reduction water pump. The pipeline includes a steam pipe, a filter section and a temperature reduction water pipe. The accessories include a stop valve, a bimetallic thermometer and a connecting pipe, a pressure gauge and a three-way valve, etc. The steam cooling and pressure reduction device uses evaporated water to produce saturated steam during the operation of the processing equipment, thereby providing the saturated steam required by the hydrolyzer.

[0012] According to the above technical solution, the dilution fan can operate normally under the boiler load of 35-100% BMCR, and a certain margin is left (the air volume margin is not less than 10%, and the air pressure margin is not less than 20%). The air volume provided by the dilution fan can fully dilute the ammonia gas, and the ammonia volume content in the ammonia / air mixture is less than 5%. The dilution fan outlet is equipped with a dilution air heater, and each device is equipped with a steam heater. The inlet air volume of the steam heater is matched with the dilution fan. When the inlet air temperature is 20°C, the outlet air temperature is not less than 200°C. The calculation formula of the processing power of the heating device is:

[0013]

[0014] in:

[0015]

[0016] Where Y 标is the heating power required by the heating device under standard conditions, t is the working time of the heating device, v is the standard flow velocity of the wind in the pipeline, Y 变 is the heating power required by the heating device after the wind speed changes, b is the wind temperature when entering the pipe, and v1 is the wind flow velocity after the flow velocity changes. When the wind temperature is higher than 20 degrees Celsius, the heating power required by the heating device will decrease, otherwise the heating power required by the heating device will increase;

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: when the present invention is working, the stirring device stirs the solution during use; when the temperature of the urea solution is too low, the heating device starts to provide the heat required for preparing a saturated urea solution, thereby preventing urea crystallization at a specific concentration; when the dissolving tank is in use, the dissolving pump circulates the urea solution from the bottom to the side of the dissolving tank, thereby better dissolving and mixing the urea solution, and at the same time, the mixed solution can be transported into a storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the system and equipment connection structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the processing flow of the present utility model. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-2The utility model provides a technical solution: a urea hydrolysis ammonia production system, including a data processing system and processing equipment, the data processing system including a solid storage module, the solid storage module is electrically connected to a feeding module, the feeding module is electrically connected to a dissolving module, the dissolving module is electrically connected to a liquid storage module, the liquid storage module is electrically connected to a hydrolysis ammonia production module, the hydrolysis ammonia production module is electrically connected to a hydrophobic module, the hydrophobic module is electrically connected to an injection module, the injection module is electrically connected to a dilution air module, the dilution air module is electrically connected to an ammonia metering module, the ammonia metering module is electrically connected to an eyewash shower module, the eyewash shower module is electrically connected to a heating module, the heating module is electrically connected to a wastewater module, and the wastewater module is electrically connected to a skid-mounted module;

[0023] The feeding module includes a bucket elevator, the dissolving module includes a dissolving tank, the liquid storage module includes a storage tank, the hydrolysis ammonia production module is electrically connected to the hydrolyzer, the drain module includes a drain tank, the wastewater module includes a water flushing device, the heating module includes a steam heating pipe, the eyewash shower module includes a wash basin and an eyewash station, the ammonia metering module includes a flow regulating pipeline, the dilution air module is electrically connected to the dilution fan, and the injection module includes an injection device.

[0024] The skid-mounted module is electrically connected to a cleaning and purging device, a safety protection device, a steam heating pipeline, and a catalyst adding device. The safety protection device includes but is not limited to shutting off steam input, releasing the gas phase pressure in the hydrolyzer, releasing the liquid phase solution in the hydrolyzer, tripping the safety valve, blasting the bursting disc, etc., which can protect the equipment and operators during use. The cleaning and purging device cleans the pipeline during the use of the hydrolyzer, and the steam heating pipeline maintains a certain temperature during the use of the hydrolyzer to meet its production needs. The catalyst adding device is a mobile simple device, including a catalyst box, a catalyst pump, a Y-type filter, an agitator, all valves and pipelines connected to the equipment body, a thermometer, a liquid level gauge, etc. A certain amount of catalyst is added during the use of the hydrolyzer, thereby improving the production efficiency of the device. The hydrolyzer outlet is equipped with a secondary steam-water separation device, a primary cyclone separation, and a secondary corrugated plate to reduce the water content in the finished ammonia gas;

[0025] The processing equipment includes a pneumatic conveying device, the pneumatic conveying device is connected to a bucket elevator, the bucket elevator is connected to a dissolving tank, the dissolving tank is connected to a dissolving pump, the dissolving pump is connected to a storage tank, the storage tank is connected to a delivery pump, the delivery pump is connected to a hydrolyzer, the hydrolyzer is connected to a drain pump, the drain pump is connected to a drain tank, the drain tank is connected to an injection device, the injection device is connected to a flow regulating valve, the flow regulating valve is connected to an ammonia / air mixer, the ammonia / air mixer is connected to a dilution fan, the dilution fan is connected to a flow regulating pipeline, the flow regulating pipeline is connected to a wash basin and an eyewash station, the wash basin and the eyewash station are connected to a steam heating pipe, and the steam heating pipe is connected to a water flushing device.

[0026] The ammonia / air mixer is connected to the dilution fan pipeline, the volume ratio concentration of the gas ammonia at the outlet is less than 5%, and the equipment and external interfaces are all flange-connected.

[0027] The injection device pipeline is connected to the flow control valve pipeline, which can adjust the amount of ammonia and air mixed gas according to different working conditions of the flue gas. The injection device has good thermal expansion, thermal deformation resistance and vibration resistance. An anti-blocking device is installed inside the injection device to avoid blockage of the injection device.

[0028] The solid storage module controls the storage of urea, and the feeding device drives the bucket elevator to lift the urea under the control of the solid storage module to the top of the dissolution tank; the dissolution module drives the dissolution tank to dissolve the urea, and the dissolution pump inside the dissolution tank circulates the liquid in the tank, and at the same time, the dissolved solution is transported into the storage tank controlled by the storage module through the dissolution pump; the storage module controls the delivery pump to transport the internal solution into the hydrolyzer controlled by the hydrolysis and ammonia production module, and the hydrolyzer vaporizes the ammonia in the solution; during the operation of the dissolution module, the liquid storage module and the hydrolysis and ammonia production module, the evaporated hydrophobicity will be recovered by the hydrophobic module, and the recovered water will flow back to the dissolution tank for recycling; The wastewater recovered by the method is treated by the wastewater module; during the use of the hydrolyzer, dissolution tank and storage tank, the heating module keeps the solution and ammonia therein at a certain temperature to avoid crystallization; during the ammonia production process, the eyewash shower module controls the movement of the wash basin and eyewash according to the position of the operator, thereby protecting the operator; the ammonia metering module calculates and adjusts the flow rate of ammonia, and at the same time adjusts the processing power of the heating device according to the flow rate of ammonia when the ammonia flows; the dilution air module controls the ammonia / air mixer to mix air and ammonia and control its concentration, thereby diluting the ammonia; the injection module injects the prepared ammonia.

[0029] The dissolving tank is equipped with a bucket elevator to transport urea granules to the top of the urea dissolving tank to meet the configuration dosage of the dissolving tank. The dissolving tank includes a stirring device, a heating device, a proportioning device and a dissolving pump. The proportioning device uses desalted water and dry urea to prepare a 50% urea solution. The stirring device is equipped with an impeller to stir the solution during use. When the temperature of the urea solution is too low, the heating device starts to provide the heat required to prepare a saturated urea solution to prevent urea crystallization at a specific concentration. During the use of the dissolving tank, the dissolving pump circulates the urea solution from the bottom to the side of the dissolving tank to better dissolve and mix the urea solution. At the same time, the mixed solution can be transported to the storage tank.

[0030] In the storage tank, urea solution with a concentration of about 50% is transported to the hydrolyzer, and saturated steam enters the hydrolyzer through the coil. The saturated steam does not mix with the urea solution and refluxes through the coil. The condensed water is recovered by the drain tank and drain pump. The concentration of urea solution in the hydrolysis reactor reaches 50%, the pressure of the gas-liquid two-phase equilibrium system is about 0.4-0.6MPa, and the temperature is about 140-160℃. The ammonia-containing gas produced in the hydrolysis reactor is diluted with hot dilution air in the ammonia-air mixer and finally enters the ammonia-flue gas mixing system. Two hydrolyzers are set up, and the capacity of each hydrolyzer is 120% of the ammonia supply of the two units under BMCR operating conditions, that is, the ammonia production capacity of each hydrolyzer (when no catalyst is added) is not less than 360kg / h. Each hydrolyzer is supplied in a skid-mounted module.

[0031] When the processing equipment is in use, the evaporated drain from the hydrolyzer, dissolution tank and solution storage tank is recovered to the drain tank. The drain tank collects the drain and uses it as water for dissolving urea particles and flushing water for pipelines. Under normal operating conditions, the excess drain is uniformly transported to the water flushing device connected to the wastewater module through the drain pump, and then discharged into the wastewater treatment station through the wastewater pump. A steam cooling and pressure reducing device is installed in the drain tank. The steam cooling and pressure reducing device includes a pressure reducing module, a temperature reducing module, a pipeline and supporting accessories. The pressure reducing module is electrically connected to a pressure reducing valve, and the temperature reducing device is electrically connected to an adjustable nozzle, a throttle valve, a safety valve and a temperature reducing water pump. The pipeline includes a steam pipe, a filter section and a temperature reducing water pipe. The accessories include a stop valve, a bimetallic thermometer and a connecting pipe, a pressure gauge and a three-way valve. The steam cooling and pressure reducing device uses evaporated drain to produce saturated steam during the operation of the processing equipment, thereby providing the saturated steam required by the hydrolyzer.

[0032] The dilution fan can operate normally under the boiler load of 35-100% BMCR, and a certain margin is left (the air volume margin is not less than 10%, and the air pressure margin is not less than 20%). The air volume provided by the dilution fan can fully dilute the ammonia gas, and the ammonia volume content in the ammonia / air mixture is less than 5%. A dilution air heater is installed at the dilution fan outlet. Each equipment is equipped with a steam heater. The steam heater inlet air volume is matched with the dilution fan. When the inlet air temperature is 20℃, the outlet air temperature is not less than 200℃. The calculation formula of the processing power of the heating device is:

[0033]

[0034] in:

[0035]

[0036] Where Y 标 is the heating power required by the heating device under standard conditions, t is the working time of the heating device, v is the standard flow velocity of the wind in the pipeline, Y 变 is the heating power required by the heating device after the wind speed changes, b is the wind temperature when entering the pipe, and v1 is the wind flow velocity after the flow velocity changes. When the wind temperature is higher than 20 degrees Celsius, the heating power required by the heating device will decrease, otherwise the heating power required by the heating device will increase;

[0037] Y 标 The standard situation is: when the air temperature entering the pipe is 20 degrees, the flow velocity of the air after entering the pipe changes to 1m / s, and the heating device works for 10s, the heating power calculation formula shows that the processing power required by the heating device is 100W;

[0038] Therefore, the heating power required by the heating device can be calculated by changing the new flow velocity of the wind after the flow velocity is changed, and then the wind in the pipeline can be heated to prevent the temperature at the outlet from being lower than 200 degrees Celsius and causing crystallization, and to avoid damage to its structure due to excessive temperature, thereby improving the processing quality of the device.

[0039] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A urea hydrolysis ammonia production system, comprising a data processing system and processing equipment, characterized in that: The data processing system includes a solid storage module, the solid storage module is electrically connected to a feeding module, the feeding module is electrically connected to a dissolution module, the dissolution module is electrically connected to a liquid storage module, the liquid storage module is electrically connected to a hydrolysis and ammonia production module, the hydrolysis and ammonia production module is electrically connected to a hydrophobic module, the hydrophobic module is electrically connected to an injection module, the injection module is electrically connected to a dilution air module, the dilution air module is electrically connected to an ammonia metering module, the ammonia metering module is electrically connected to an eyewash shower module, the eyewash shower module is electrically connected to a heating module, the heating module is electrically connected to a wastewater module, and the wastewater module is electrically connected to a skid-mounted module.

2. A urea hydrolysis ammonia production system according to claim 1, characterized in that: The feeding module includes a bucket elevator, the dissolving module includes a dissolving tank, the liquid storage module includes a storage tank, the hydrolysis ammonia production module is electrically connected to the hydrolyzer, the drain module includes a drain tank, the wastewater module includes a water flushing device, the heating module includes a steam heating pipe, the eyewash shower module includes a hand sink and an eyewash station, the ammonia metering module includes a flow regulating pipeline, the dilution air module is electrically connected to the dilution fan, and the injection module includes an injection device.

3. The urea hydrolysis ammonia production system according to claim 1, characterized in that: The skid-mounted module is electrically connected to a cleaning and purging device, a safety protection device, a steam heating pipeline, and a catalyst adding device. The safety protection device includes a device for cutting off steam input, releasing the gas phase pressure in the hydrolyzer, releasing the liquid phase solution in the hydrolyzer, tripping the safety valve, and blasting the bursting disc. The cleaning and purging device cleans the pipeline during the use of the hydrolyzer. The steam heating pipeline maintains a certain temperature during the use of the hydrolyzer. The catalyst adding device is a mobile and simple device, including a catalyst box, a catalyst pump, a Y-type filter, an agitator, all valves and pipelines connected to the equipment body, a thermometer, and a liquid level gauge. A certain amount of catalyst is added during the use of the hydrolyzer. The outlet of the hydrolyzer is equipped with a secondary steam-water separation device, a primary cyclone separation, and a secondary corrugated plate. The processing equipment includes a pneumatic conveying device, which is transmission-connected to a bucket elevator, which is transmission-connected to a dissolving tank, which is transmission-connected to a dissolving pump, which is transmission-connected to a storage tank, which is transmission-connected to a delivery pump, which is transmission-connected to a hydrolyzer, which is transmission-connected to a drain pump, which is transmission-connected to a drain tank, which is transmission-connected to an injection device, which is transmission-connected to a flow regulating valve, which is transmission-connected to an ammonia / air mixer, which is transmission-connected to a dilution fan, which is transmission-connected to a flow regulating pipeline, which is transmission-connected to a handwashing sink and an eyewash station, which are transmission-connected to a steam heating pipeline, which is transmission-connected to a water flushing device; The ammonia / air mixer is connected to the dilution fan pipeline, the volume ratio concentration of the gas ammonia at the outlet is less than 5%, and the equipment and the external interface are flange-connected; The injection device pipeline is connected to the flow regulating valve pipeline.

4. A urea hydrolysis ammonia production system according to claim 2, characterized in that: The solid storage module controls the storage of urea, and the feeding device drives the bucket elevator to lift the urea under the control of the solid storage module to the top of the dissolution tank; the dissolution module drives the dissolution tank to dissolve the urea, and the dissolution pump inside the dissolution tank circulates the liquid in the tank, and at the same time, the dissolved solution is transported into the storage tank controlled by the storage module through the dissolution pump; the storage module controls the delivery pump to transport the internal solution into the hydrolyzer controlled by the hydrolysis and ammonia production module, and the hydrolyzer vaporizes the ammonia in the solution; during the operation of the dissolution module, the liquid storage module and the hydrolysis and ammonia production module, the evaporated hydrophobicity will be recovered by the hydrophobic module, and the recovered water flows back to the The wastewater is recycled in the dissolving tank; the wastewater that cannot be recycled is treated by the wastewater module; during the use of the hydrolyzer, dissolving tank and storage tank, the heating module keeps the solution and ammonia therein at a certain temperature to avoid crystallization; during the ammonia production process, the eyewash shower module controls the movement of the wash basin and eyewash according to the position of the operator; the ammonia metering module calculates and adjusts the flow rate of ammonia, and at the same time calculates and adjusts the processing power of the heating device according to the flow rate of ammonia when the ammonia flows; the dilution air module controls the ammonia / air mixer to mix air and ammonia and control their concentration, thereby diluting the ammonia; the injection module injects the prepared ammonia.

5. A urea hydrolysis ammonia production system according to claim 4, characterized in that: The dissolution tank is equipped with a bucket elevator to transport urea granules to the top of the urea dissolution tank to meet the configuration dosage of the dissolution tank. The dissolution tank includes a stirring device, a heating device, a proportioning device and a dissolution pump. The proportioning device uses desalted water and dry urea to prepare a 50% urea solution. The stirring device is equipped with an impeller to stir the solution during use. The dissolution pump circulates the urea solution from the bottom to the side of the dissolution tank and transports the mixed solution into a storage tank.

6. A urea hydrolysis ammonia production system according to claim 4, characterized in that: In the storage tank, a urea solution with a concentration of approximately 50% is transported to the hydrolyzer. Saturated steam enters the hydrolyzer through a coil. The saturated steam does not mix with the urea solution and refluxes through the coil. Condensed water is recovered by a drain tank and a drain pump. The concentration of the urea solution in the hydrolysis reactor reaches 50%. The pressure of the gas-liquid two-phase equilibrium system is approximately 0.4-0.6 MPa and the temperature is approximately 140-160°C. The ammonia-containing gas generated in the hydrolysis reactor is diluted with hot dilution air at an ammonia-air mixer and finally enters the ammonia-flue gas mixing system. Two hydrolyzers are set, and the capacity of each hydrolyzer is 120% of the ammonia supply of the two units under BMCR operating conditions, that is, the ammonia production capacity of each hydrolyzer is not less than 360 kg / h. Each hydrolyzer is supplied in a skid-mounted module.

7. A urea hydrolysis ammonia production system according to claim 6, characterized in that: The evaporated water from the hydrolyzer, dissolution tank and solution storage tank is recovered to a drain tank, which collects water for use as water for dissolving urea particles and flushing pipelines. A steam cooling and pressure reducing device is installed in the drain tank, which includes a pressure reducing module, a temperature reducing module, a pipeline and supporting accessories. The pressure reducing module is electrically connected to a pressure reducing valve, and the temperature reducing device is electrically connected to an adjustable nozzle, a throttle valve, a safety valve and a temperature reducing water pump. The pipeline includes a steam pipeline, a filter section and a temperature reducing water pipe. The accessories include a stop valve, a bimetallic thermometer and a connecting pipe, a pressure gauge and a three-way valve. The steam cooling and pressure reducing device uses evaporated water to produce saturated steam during the operation of the processing equipment.

8. The urea hydrolysis ammonia production system according to claim 3, characterized in that: The dilution fan can operate normally under the boiler load of 35-100% BMCR with a certain margin. The air volume provided by the dilution fan can fully dilute the ammonia gas, and the ammonia volume content in the ammonia / air mixture is less than 5%. The dilution fan outlet is equipped with a dilution air heater. Each device is equipped with a steam heater. The steam heater inlet air volume is matched with the dilution fan. When the inlet air temperature is 20°C, the outlet air temperature is not lower than 200°C. The calculation formula of the processing power of the heating device is: in: Where Y 标 is the heating power required by the heating device under standard conditions, t is the working time of the heating device, v is the standard flow velocity of the wind in the pipeline, Y 变 is the heating power required by the heating device after the wind speed changes, b is the temperature of the wind when it enters the pipe, and v1 is the flow velocity of the wind after the flow velocity changes.

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