CN219567593U - Anti-blocking urea hydrolysis system - Google Patents
Anti-blocking urea hydrolysis system Download PDFInfo
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- CN219567593U CN219567593U CN202321305279.5U CN202321305279U CN219567593U CN 219567593 U CN219567593 U CN 219567593U CN 202321305279 U CN202321305279 U CN 202321305279U CN 219567593 U CN219567593 U CN 219567593U
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Abstract
The utility model relates to the technical field of urea hydrolysis, in particular to an anti-blocking urea hydrolysis system capable of rapidly straining load, which comprises a urea solution storage tank and a urea hydrolyzer which are sequentially communicated, wherein the urea solution storage tank is communicated with a urea dissolving device, the urea hydrolyzer is communicated with a boiler system, a preheating device is arranged in the urea solution storage tank, and a hydrolysis heating device is arranged in the urea hydrolyzer. The utility model solves the problem of pipeline blockage caused by crystallization phenomenon when the existing ammonia supply system operates; meanwhile, the power of the hydrolysis heater can be adjusted according to the ammonia supply amount, the change response of the ammonia supply amount is timely, the hydrolysis heater is safe and reliable, resources are saved, and the hydrolysis heater is suitable for industrial popularization and use.
Description
Technical Field
The utility model relates to the technical field of urea hydrolysis, in particular to an anti-blocking urea hydrolysis system capable of rapidly straining load.
Background
The SCR denitration technology mainly adopts liquid ammonia, ammonia water or urea as a reducing agent to prepare ammonia, and carries out denitration reduction reaction under the action of a catalyst, wherein the ammonia is prepared by evaporating the liquid ammonia, so that the investment is cheapest, the transportation and use costs are also the lowest, but the liquid ammonia system has great potential safety hazards, and safety accidents are frequently rare; the investment, operation and transportation costs of the ammonia water system are very high and are safer than those of liquid ammonia, but certain potential safety hazards still exist; the investment and operation cost of the urea system is higher than that of the liquid ammonia system, but the transportation cost is relatively lower, and the urea system has no potential safety hazard basically, so that the urea system is the safest ammonia preparation technology.
In the denitration reaction system taking urea as a reducing agent, urea particles are required to be dissolved into 50% urea solution, the urea solution is conveyed to a urea solution storage tank for storage through a pump body, and then the urea solution is conveyed to a hydrolysis reactor through the pump body. Under the action of steam heating, the hydrolysis reactor decomposes urea into ammonia gas of about 0.40-0.55 MPa and 120-150 ℃, and then enters a mixer of a denitration area through an ammonia metering and distributing system.
The urea hydrolysis ammonia supply system can generate low-temperature crystallization of two substances of urea solution and product gas in operation, the theoretical crystallization temperature of the urea solution with the mass fraction of 50 percent is lower than 30 ℃, the reflux temperature of water vapor in denitration product gas is 133 ℃, and the crystallization precipitation temperature of carbamic acid engraving is 85 ℃, so that the system crystallization phenomenon can occur when the urea solution is lower than 30 ℃ and the temperature of the denitration product gas system is lower than 85 ℃.
In summary, there is a need in the market for an anti-blocking urea hydrolysis system, which solves the problem that when the urea hydrolysis ammonia supply system is in operation, the urea solution is lower than 30 ℃ and the temperature of the denitration product gas system is lower than 85 ℃, the system is crystallized, resulting in pipeline blockage.
Disclosure of Invention
The utility model aims to provide an anti-blocking urea hydrolysis system, which aims to solve the problem that in the prior art, when an ammonia supply system runs, a urea solution is lower than 30 ℃, and when the temperature of a denitration product gas system is lower than 85 ℃, the system is crystallized, so that a pipeline is blocked.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the utility model provides an anti-blocking urea hydrolysis system, includes urea solution storage tank and urea hydrolyzer that communicate in proper order, urea solution storage tank and urea dissolving device intercommunication, urea hydrolyzer and boiler system intercommunication, set up preheating device in the urea solution storage tank, set up hydrolysis heating device in the urea hydrolyzer.
Further, the hydrolysis heating device comprises a hydrolysis heater, a hydrophobic tank and a hydrolysis heating control system, wherein one end of the hydrolysis heater is communicated with the auxiliary steam system, and the other end of the hydrolysis heater is communicated with the hydrophobic tank;
the hydrolysis heating control system comprises a hydrolysis pressure control unit, wherein the hydrolysis pressure control unit comprises a first pressure sensor, a sixth regulating valve and a pressure controller, the sixth regulating valve is arranged on the hydrolysis heater, the first pressure sensor is electrically connected with the pressure controller, and the pressure controller is electrically connected with the sixth regulating valve.
Further, the hydrolysis heating control system further comprises a hydrolysis temperature control unit which is parallel to the hydrolysis pressure control unit, the hydrolysis temperature control unit comprises a second temperature sensor and a second temperature controller, the second temperature sensor is electrically connected with the second temperature controller, and the second temperature controller is electrically connected with the sixth regulating valve.
Further, the hydrolysis heating control system further comprises a hydrolysis liquid level control unit which is parallel to the hydrolysis pressure control unit and the hydrolysis temperature control unit, wherein the hydrolysis liquid level control unit comprises a third liquid level controller and a second liquid level sensor, and the second liquid level sensor is electrically connected with the third liquid level controller; the urea solution storage tank is communicated with the urea hydrolyzer through a urea solution pipeline, a third regulating valve and a variable frequency pump are sequentially arranged on the urea solution pipeline, and the third liquid level controller is respectively and electrically connected with the third regulating valve and the variable frequency pump.
Further, the tail end of the urea solution pipeline is provided with a urea solution inlet pipe and a urea solution return pipe which are in parallel, the urea solution inlet pipe is communicated with the urea hydrolyzer, a fourth regulating valve is arranged on the urea solution inlet pipe, and the fourth regulating valve is electrically connected with a third liquid level controller; the liquid return pipe is communicated with the urea solution storage tank, a fifth regulating valve is arranged on the liquid return pipe, and the fifth regulating valve is electrically connected with the third liquid level controller.
Further, a steam-water separation device is arranged at the top of the urea hydrolyzer, a steam outlet end of the steam-water separation device is communicated with the boiler system through an ammonia outlet pipe, a seventh regulating valve and a second pressure sensor are arranged on the ammonia outlet pipe, the second pressure sensor is electrically connected with a pressure controller, and the pressure controller is electrically connected with the seventh regulating valve.
Further, a drain pipe is arranged at the bottom of the urea hydrolyzer, and a ninth regulating valve is arranged on the drain pipe.
Further, the preheating device comprises a urea solution storage tank heater and a preheating control system, one end of the urea solution storage tank heater is communicated with the auxiliary steam system, and the other end of the urea solution storage tank heater is communicated with the drain tank; the preheating control system comprises a preheating temperature control unit, the preheating temperature control unit comprises a first temperature sensor, a second regulating valve and a first temperature controller, the second regulating valve is arranged on a urea solution storage tank heater, the first temperature sensor is electrically connected with the first temperature controller, and the first temperature controller is electrically connected with the second regulating valve.
Further, the preheating control system further comprises a preheating liquid level control unit parallel to the preheating temperature control unit, the preheating liquid level control unit comprises a first liquid level sensor and a first liquid level controller, the urea solution storage tank is communicated with the urea dissolving device through a urea solution liquid pipe, a first regulating valve is arranged on the urea solution liquid pipe, the first liquid level sensor is electrically connected with the first liquid level controller, and the first liquid level controller is electrically connected with the first regulating valve.
Further, the bottom of the drain tank is provided with a drain pipe, an eighth regulating valve is arranged on the drain pipe, a drain tank liquid level control unit is arranged inside the drain tank and comprises a second liquid level controller and a third liquid level sensor, the third liquid level sensor is electrically connected with the second liquid level controller, and the second liquid level controller is electrically connected with the eighth regulating valve.
Compared with the prior art, the utility model has the beneficial effects that:
1. an anti-blocking urea hydrolysis system comprises a urea solution storage tank and a urea hydrolyzer which are sequentially communicated, wherein the urea solution storage tank is communicated with a urea dissolving device, the urea hydrolyzer is communicated with a boiler system, a preheating device is arranged in the urea solution storage tank, and a hydrolysis heating device is arranged in the urea hydrolyzer; the preheating device preheats the urea solution in the urea solution storage tank, prevents that urea solution temperature from appearing urea precipitation crystallization phenomenon below 30 ℃, prevents that the pipeline from blockking up, and hydrolysis heating device heats the product gas in the urea hydrolyzer, prevents that denitration product gas system temperature from appearing below 85 ℃, and the phenomenon of carbamic acid fretwork crystallization appears, prevents that the pipeline from blockking up.
2. The hydrolysis heating control system is additionally arranged in the urea hydrolyzer, so that the control of the ammonia supply amount is realized, the automatic control of the system is enhanced, the reaction capacity of the system to the ammonia supply amount is improved, the occurrence of urea hydrolysis side reaction is avoided, and the conversion rate of preparing ammonia by hydrolysis is improved:
the hydrolysis heating device comprises a hydrolysis heater, a hydrophobic tank and a hydrolysis heating control system, one end of the hydrolysis heater is communicated with the auxiliary steam system, and the other end of the hydrolysis heater is communicated with the hydrophobic tank;
specifically, the hydrolysis heating control system comprises a hydrolysis pressure control unit, a hydrolysis temperature control unit and a hydrolysis liquid level control unit which are arranged in parallel;
the hydrolysis pressure control unit comprises a first pressure sensor, a sixth regulating valve and a pressure controller, the sixth regulating valve is arranged on the hydrolysis heater, the first pressure sensor is electrically connected with the pressure controller, the pressure controller is electrically connected with the sixth regulating valve, the pressure sensor detects the pressure in the urea hydrolyzer, and the pressure controller controls the auxiliary steam inlet amount according to the pressure in the urea hydrolyzer;
the hydrolysis temperature control unit comprises a second temperature sensor and a second temperature controller, the second temperature sensor is electrically connected with the second temperature controller, the second temperature controller is electrically connected with the sixth regulating valve, the second temperature sensor detects the temperature in the urea hydrolyzer, and the second temperature controller controls the auxiliary steam inlet amount according to the temperature in the urea hydrolyzer, so that the control of the heating temperature is realized;
the hydrolysis liquid level control unit comprises a third liquid level controller and a second liquid level sensor, and the second liquid level sensor is electrically connected with the third liquid level controller; the urea solution storage tank is communicated with the urea hydrolyzer through a urea solution pipeline, a third regulating valve and a variable frequency pump are sequentially arranged on the urea solution pipeline, and a third liquid level controller is respectively and electrically connected with the third regulating valve and the variable frequency pump; the second liquid level sensor detects the liquid level in the urea hydrolyzer, and the liquid level sensor controls the liquid inlet amount of the urea solution according to the liquid level in the urea hydrolyzer.
3. Similarly, a preheating control system is arranged in the urea solution storage tank, and specifically, the preheating control system comprises a preheating temperature control unit and a preheating liquid level control unit which are parallel;
the preheating temperature control unit comprises a first temperature sensor, a first regulating valve and a first temperature controller, wherein the first temperature sensor is electrically connected with the first temperature controller, and the first temperature controller is electrically connected with the first regulating valve;
the preheating liquid level control unit comprises a first liquid level sensor and a first liquid level controller, the urea solution storage tank is communicated with the urea dissolving device through a urea solution incoming pipe, a first regulating valve is arranged on the urea solution incoming pipe, the first liquid level sensor is electrically connected with the first liquid level controller, and the first liquid level controller is electrically connected with the first regulating valve;
by additionally arranging a preheating control system, the automatic control of preheating is realized, and the precipitation of crystals in the urea solution storage tank is prevented; meanwhile, the ammonia supply amount is controlled, and the reaction capacity of the system on the ammonia supply amount is improved.
4. Further, a water-repellent tank liquid level control unit is arranged in the water-repellent tank, the water-repellent tank liquid level control unit comprises a second liquid level controller and a third liquid level sensor, and an eighth regulating valve is arranged on a drain pipe of the water-repellent tank, so that the liquid level in the water-repellent tank is automatically controlled, and the system operation liquid level control is realized without manual adjustment.
In conclusion, the utility model solves the problems that the existing ammonia supply system is in operation, the urea solution is lower than 30 ℃, the system is in crystallization phenomenon when the temperature of the denitration product gas system is lower than 85 ℃, and the pipeline is blocked; meanwhile, the power of the hydrolysis heater can be adjusted according to the ammonia supply amount, the change response of the ammonia supply amount is timely, the hydrolysis heater is safe and reliable, resources are saved, and the hydrolysis heater is suitable for industrial popularization and use.
Drawings
FIG. 1 is a schematic diagram of a system architecture according to an embodiment of the present utility model;
in the figure: 1. a urea solution storage tank; 2. urea solution liquid inlet pipe; 3. a first regulating valve; 4. a first liquid level sensor; 5. a first temperature sensor; 6. a first liquid level controller; 7. a urea solution tank heater; 8. a first auxiliary steam inlet pipe; 9. a second regulating valve; 10. a first hydrophobic pipe; 11. a first temperature controller; 12. a urea hydrolyzer; 13. a urea solution inlet pipe; 14. a third regulating valve; 15. a variable frequency pump; 16. a fourth regulating valve; 17. a liquid return pipe; 18. a fifth regulating valve; 19. a hydrolysis heater; 20. a steam-water separation device; 21. a second temperature sensor; 22. a first pressure sensor; 23. a second liquid level sensor; 24. a second auxiliary steam inlet pipe; 25. a sixth regulating valve; 26. an ammonia gas outlet pipe; 27. a seventh regulating valve; 28. a second pressure sensor; 29. a pressure controller; 30. a second hydrophobic pipe; 31. a hydrophobic tank; 32. a third liquid level sensor; 33. a drain pipe; 34. an eighth regulating valve; 35. a second liquid level controller; 36. a blow-down pipe; 37. a ninth regulator valve; 38. and a third liquid level controller.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, but the present utility model is not limited to the embodiments described below.
Examples
The auxiliary steam system (hereinafter referred to as auxiliary steam system) in the factory is adopted to carry out heat tracing on urea solution and a product gas pipeline, and the auxiliary steam system has the function of providing a steam source for hydrolysis of the urea solution; meanwhile, the production heating steam is provided for related equipment, and the thermal measuring instrument is subjected to heat tracing, so that the temperature of the urea solution is not lower than 30 ℃, and the finished gas from the hydrolyzer is required to be maintained at more than 85 ℃ so as to prevent crystallization in a pipeline.
Referring specifically to fig. 1, an anti-blocking urea hydrolysis system according to the present embodiment includes a urea solution storage tank 1, a urea hydrolyzer 12, and a drain tank 31.
The urea solution storage tank 1 is provided with a liquid inlet end, a steam inlet end and a liquid outlet end, the steam inlet end of the urea solution storage tank 1 is communicated with an auxiliary steam system, the liquid inlet end of the urea solution storage tank 1 is communicated with a urea dissolving device, and the liquid outlet end of the urea solution storage tank 1 is communicated with the urea hydrolyzer 12; the urea solution storage tank 1 is internally provided with a preheating device, the preheating device is specifically a urea solution storage tank heater 7, one end of the urea solution storage tank heater 7 is communicated with an auxiliary steam system, and the other end of the urea solution storage tank heater 7 is communicated with a drain tank 31.
The urea hydrolyzer 12 is provided with a liquid inlet end, a liquid outlet end, a steam inlet end and a steam outlet end, the liquid inlet end of the urea hydrolyzer 12 is communicated with the liquid outlet end of the urea solution storage tank 1, the steam inlet end of the urea hydrolyzer 12 is communicated with an auxiliary steam system, the steam outlet end of the urea hydrolyzer 12 is communicated with a boiler system, and the liquid outlet end of the urea hydrolyzer 12 is provided with a drain pipe 33; the urea hydrolyzer 12 is internally provided with a hydrolysis heating device, specifically a hydrolysis heater 19, one end of the hydrolysis heater 19 is communicated with an auxiliary steam system, and the other end of the hydrolysis heater 19 is communicated with a drain tank 31.
The urea solution storage tank 1 and the urea hydrolyzer 12 are respectively provided with a urea solution storage tank heater 7 and a hydrolysis heater 19, the urea solution storage tank heater 7 preheats the urea solution in the urea solution storage tank, prevents urea precipitation crystallization phenomenon from occurring when the temperature of the urea solution is lower than 30 ℃, prevents pipeline blockage, and the hydrolysis heater 19 heats the product gas in the urea hydrolyzer 12, prevents the phenomenon of carbamic acid engraving crystallization from occurring when the temperature of a denitration product gas system is lower than 85 ℃, and prevents pipeline blockage.
Further improvement, in order to prevent the increase of SCR denitration load, the system of the utility model needs long heating hydrolysis time, so that the denitration efficiency is low; the SCR denitration load is reduced, the ammonia yield of the system is larger than the ammonia required by the system, so that ammonia escape is increased, and the environmental protection requirement is not met; and the increase of the ammonia yield easily causes the increase of the pressure and the temperature in the urea hydrolyzer 12, so that the occurrence of urea hydrolysis side reaction is caused, the conversion rate of the hydrolyzed ammonia production is low, the economic benefit of hydrolysis is affected, and the following improvement is made on the system control:
the liquid inlet of the urea solution storage tank 1 is communicated with a urea solution inlet pipe 2, and a first regulating valve 3 is also arranged on the urea solution inlet pipe 2; the urea solution storage tank 1 is internally provided with a preheating control system, and the preheating control system comprises a first liquid level sensor 4 and a first temperature sensor 5; one end of the urea solution storage tank heater 7 is communicated with an auxiliary steam system through a first auxiliary steam inlet pipe 8, the other end of the urea solution storage tank heater 7 is communicated with a drain tank 31 through a first drain pipe 10, and a second regulating valve 9 is arranged on the first auxiliary steam inlet pipe 8; the liquid outlet end of the urea solution storage tank 1 is communicated with the liquid inlet end of the urea hydrolyzer 12 through a urea solution pipeline, a third regulating valve 14 and a variable frequency pump 15 are sequentially arranged on the urea solution pipeline, the tail end of the urea solution pipeline is provided with a urea solution liquid inlet pipe 13 and a liquid return pipe 17 which are parallel, the urea solution liquid inlet pipe 13 is communicated with the urea hydrolyzer 12, a fourth regulating valve 16 is arranged on the urea solution liquid inlet pipe 13, and the fourth regulating valve 16 is electrically connected with a third liquid level controller 38; the liquid return pipe 17 is communicated with the urea solution storage tank 1, a fifth regulating valve 18 is arranged on the liquid return pipe 17, and the fifth regulating valve 18 is electrically connected with a third liquid level controller 38; the tail ends of the urea solution pipelines are provided with a urea solution inlet pipe 13 and a urea solution return pipe 17 which are parallel, the urea solution inlet pipe 13 and the urea solution return pipe 17 control the amount entering the urea hydrolyzer 12, and the ammonia supply amount is regulated through a fourth regulating valve 16 and a fifth regulating valve 18.
The top of the urea hydrolyzer 12 is provided with a steam-water separation device 20, the hydrolysis heater 19 is distributed at the middle position of one side of the urea hydrolyzer 12, and the steam-water separation device 20 is distributed at the upper position of the other side of the urea hydrolyzer 12; the inlet end of the hydrolysis heater 19 is communicated with an auxiliary steam system through a second auxiliary steam inlet pipe 24, a sixth regulating valve 25 and a second temperature controller are arranged on the second auxiliary steam inlet pipe 24, and the outlet end of the hydrolysis heater 19 is communicated with the top of a drain tank 31 through a second drain pipe 30; the upper part of the steam-water separation device 20 is communicated with an ammonia gas outlet pipe 26, and a seventh regulating valve 27 and a second pressure sensor 28 are sequentially arranged on the ammonia gas outlet pipe 26; the bottom of one side of the urea hydrolyzer 12 is communicated with the lower end of the urea solution storage tank 1 through a urea solution inlet pipe 13, the bottom of the other side of the urea hydrolyzer is provided with a drain pipe 36, and a ninth regulating valve 37 is arranged on the drain pipe 36; the urea hydrolyzer 12 is further provided with a second temperature sensor 21, a first pressure sensor 22 and a second liquid level sensor 23.
The drain tank 31 of the embodiment is communicated with the outlet end of the urea solution storage tank heater 7 through a first drain pipe 10 and is communicated with the outlet end of the hydrolysis heater 19 through a second drain pipe 30; the drain tank 31 collects the drain water after heat exchange in the urea solution storage tank heater 7 and the hydrolysis heater 19, a drain pipe 33 is arranged at the lower part of the drain tank 31, and an eighth regulating valve 34 is arranged on the drain pipe 33; the third liquid level sensor 32 is further arranged on the water drain tank 31, so that the liquid level in the water drain tank is automatically controlled, and the system operation liquid level does not need to be manually adjusted.
The first liquid level controller 6 of the present embodiment receives the signal of the first liquid level sensor 4, and controls the opening of the first regulating valve 3 according to the signal of the first liquid level sensor 4; the first temperature controller 11 adopts a commercially available TTC series first temperature controller, receives the signal of the first temperature sensor 5, and controls the opening of the second regulating valve 9 according to the signal of the first temperature sensor 5; a third liquid level controller 38 that receives the signal from the second liquid level sensor 23 and controls the opening degrees of the fourth regulator valve 16 and the fifth regulator valve 18 according to the signal from the second liquid level sensor 23; a second liquid level controller 35 that receives the signal from the third liquid level sensor 32 and controls the opening of the eighth regulator valve 34 in accordance with the signal from the third liquid level sensor 32; the pressure controller 29 adopts a commercial PTC series pressure/differential pressure transmitter controller, which receives signals of the first pressure sensor 22 and the second pressure sensor 28, controls the opening of the sixth regulating valve 25 according to the signals of the first pressure sensor 22 and the second pressure sensor 28, is preferably a VPC2021 series controller manufactured by the company yi, can be connected with various types of vacuum pressure sensors, flow meters, temperature sensors, electric regulating valves, heaters and the like to realize the control of parameters such as pressure, flow rate, temperature and the like, can connect the second temperature sensor 21 with a VPC2021 series controller to replace the second temperature controller, and simultaneously controls the opening of the sixth regulating valve 25 according to the signals of the second temperature sensor 21, the first pressure sensor 22 and the second pressure sensor 28; the first level controller 6, the second level sensor 23 and the third level sensor 32 all employ commercially available LTC series capacitive level transmitters.
The working process of the anti-blocking urea hydrolysis system and the control method of the embodiment is as follows:
urea solution is injected into a urea solution storage tank 1:
1) Closing the third regulating valve 14 and the fifth regulating valve 18, opening the first regulating valve 3 to 10% opening, and injecting urea solution into the urea solution storage tank 1 through the urea solution liquid inlet pipe 2;
2) The first liquid level sensor 4 and the first temperature sensor 5 are put into use, the second regulating valve 9 is opened to 5 percent of opening, the auxiliary steam heats the urea solution storage tank heater 7 through the first auxiliary steam inlet pipe 8, and the urea solution in the urea solution storage tank 1 is indirectly heated;
3) The first liquid level controller 6 is used for automatic control, the first liquid level controller 6 receives signals of the first regulating valve 3 and the first liquid level sensor 4, and the opening of the first regulating valve 3 is controlled according to the signals of the first liquid level sensor 4, so that the liquid level of urea solution in the urea solution storage tank 1 is ensured to be in a normal range; the first temperature controller 11 is used for automatic control, the first temperature controller 11 receives signals of the second regulating valve 9 and the first temperature sensor 5, and the opening degree of the second regulating valve 9 is controlled according to the signals of the first temperature sensor 5, so that the temperature of the urea solution in the urea solution storage tank 1 is ensured to be in a normal range.
Urea solution is injected into urea hydrolyzer 12:
1) The seventh regulating valve 27, the ninth regulating valve 37 and the sixth regulating valve 25 are closed, the third regulating valve 14 and the fifth regulating valve 18 are opened to 100 percent of opening, and the fourth regulating valve 16 is opened to 10 percent of opening;
2) Starting a variable frequency pump 15, enabling urea solution in the urea solution storage tank 1 to enter the urea hydrolyzer 12 through a urea solution inlet pipe 13, adjusting the opening of a fourth adjusting valve 16 and a fifth adjusting valve 18, and throwing a second temperature sensor 21, a first pressure sensor 22 and a second liquid level sensor 23 when the urea solution in the urea solution storage tank 1 is in a normal liquid level range;
3) The third liquid level controller 38 is used for automatic control, receives signals of the fourth regulating valve 16, the fifth regulating valve 18 and the second liquid level sensor 23, and controls the opening degree of the fourth regulating valve 16 and the fifth regulating valve 18 according to the signals of the second liquid level sensor 23, so that the normal range of the urea liquid level in the urea hydrolyzer 12 is ensured.
And (3) using a hydrolysis heater:
1) Opening a sixth regulating valve 25 to 10% of opening, and enabling auxiliary steam to enter the hydrolysis heater 19 through a second auxiliary steam inlet pipe 24, and enabling the auxiliary steam to drain through a second drain pipe 30 to a drain tank 31;
2) At this time, the second temperature sensor 21, the first pressure sensor 22 and the second liquid level sensor 23 of the urea hydrolyzer 12 will rise gradually, when the second temperature sensor 21, the first pressure sensor 22 and the second liquid level sensor 23 reach the normal operation range, the seventh regulating valve 27 is opened, the second pressure sensor 28 is put into use, the opening of the sixth regulating valve 25 is adjusted, and the pressures of the first pressure sensor 22 and the second pressure sensor 28 are ensured to be in the normal operation range;
3) The on-line pressure controller 29 is automatically controlled, receives signals of the first pressure sensor 22, the sixth regulating valve 25 and the second pressure sensor 28, and controls the opening of the sixth regulating valve 25 according to the signals of the first pressure sensor 22 and the second pressure sensor 28;
4) The ninth regulating valve 37 is opened periodically, the concentration of the relevant ions in the discharged liquid of the urea hydrolyzer 12 is sampled and tested, when the ion concentration is higher than the standard requirement, the discharged liquid is tested again for a certain time, and the ninth regulating valve 37 is closed again until the relevant ion concentration is qualified.
Hydrophobic discharge of the hydrophobic tank:
1) When the liquid level of the drain tank 31 is at a high level, opening an eighth regulating valve 34 to drain the drain water in the drain tank 31;
2) The second liquid level controller 35 is used for automatic control, receives signals of the eighth regulating valve 34 and the third liquid level sensor 32, and controls the opening of the eighth regulating valve 34 according to the signals of the third liquid level sensor 32, so as to maintain the normal liquid level range in the hydrophobic tank 31.
The anti-blocking urea hydrolysis system is operated for standby:
1) When the unit is overhauled or stopped, the air inlet valve at the rear furnace side of the ammonia gas outlet pipe 26 is closed, and the pressure of the second pressure sensor 28 is increased;
2) The pressure controller 29 is automatically controlled to receive the pressure rising signals of the first pressure sensor 22 and the second pressure sensor 28, so that the opening of the sixth regulating valve 25 is reduced, the pressure of the second pressure sensor 28 is maintained in a normal range, and the anti-blocking urea hydrolysis system is changed from operation to standby state.
In conclusion, the utility model solves the problems that the existing ammonia supply system is in operation, the urea solution is lower than 30 ℃, the system is in crystallization phenomenon when the temperature of the denitration product gas system is lower than 85 ℃, and the pipeline is blocked; meanwhile, the liquid level of the urea solution storage tank, the liquid level of the urea hydrolyzer and the liquid level of the drain tank can be automatically controlled, the operating liquid level range of the equipment does not need manual adjustment, and the key parameters of the anti-blocking urea hydrolysis system are ensured to be safe and reliable; the power of the hydrolysis heater can be adjusted according to the ammonia supply amount, the change response of the ammonia supply amount is timely, the hydrolysis heater is safe and reliable, resources are saved, and the hydrolysis heater is suitable for industrial popularization and use.
Claims (10)
1. An anti-blocking urea hydrolysis system, which is characterized in that: the urea solution storage tank (1) and the urea hydrolyzer (12) are communicated in sequence, the urea solution storage tank (1) is communicated with the urea dissolving device, the urea hydrolyzer (12) is communicated with the boiler system, a preheating device is arranged in the urea solution storage tank (1), and a hydrolysis heating device is arranged in the urea hydrolyzer (12).
2. An anti-fouling urea hydrolysis system as claimed in claim 1, wherein: the hydrolysis heating device comprises a hydrolysis heater (19), a drain tank (31) and a hydrolysis heating control system, one end of the hydrolysis heater (19) is communicated with the auxiliary steam system, and the other end of the hydrolysis heater (19) is communicated with the drain tank (31);
the hydrolysis heating control system comprises a hydrolysis pressure control unit, wherein the hydrolysis pressure control unit comprises a first pressure sensor (22), a sixth regulating valve (25) and a pressure controller (29), the sixth regulating valve (25) is arranged on the hydrolysis heater (19), the first pressure sensor (22) is electrically connected with the pressure controller (29), and the pressure controller (29) is electrically connected with the sixth regulating valve (25).
3. An anti-fouling urea hydrolysis system as claimed in claim 2, wherein: the hydrolysis heating control system further comprises a hydrolysis temperature control unit which is parallel to the hydrolysis pressure control unit, the hydrolysis temperature control unit comprises a second temperature sensor (21) and a second temperature controller (39), the second temperature sensor (21) is electrically connected with the second temperature controller, and the second temperature controller (39) is electrically connected with the sixth regulating valve (25).
4. An anti-fouling urea hydrolysis system according to claim 3, wherein: the hydrolysis heating control system further comprises a hydrolysis liquid level control unit which is parallel to the hydrolysis pressure control unit and the hydrolysis temperature control unit, wherein the hydrolysis liquid level control unit comprises a third liquid level controller (38) and a second liquid level sensor (23), and the second liquid level sensor (23) is electrically connected with the third liquid level controller (38); the urea solution storage tank (1) is communicated with the urea hydrolyzer (12) through a urea solution pipeline, a third regulating valve (14) and a variable frequency pump (15) are sequentially arranged on the urea solution pipeline, and a third liquid level controller (38) is electrically connected with the third regulating valve (14) and the variable frequency pump (15) respectively.
5. An anti-fouling urea hydrolysis system according to claim 4, wherein: the tail end of the urea solution pipeline is provided with a urea solution inlet pipe (13) and a liquid return pipe (17) which are parallel, the urea solution inlet pipe (13) is communicated with the urea hydrolyzer (12), a fourth regulating valve (16) is arranged on the urea solution inlet pipe (13), and the fourth regulating valve (16) is electrically connected with a third liquid level controller (38); the liquid return pipe (17) is communicated with the urea solution storage tank (1), a fifth regulating valve (18) is arranged on the liquid return pipe (17), and the fifth regulating valve (18) is electrically connected with the third liquid level controller (38).
6. An anti-fouling urea hydrolysis system according to claim 5, wherein: the top of urea hydrolyzer (12) sets up steam-water separation device (20), the play vapour end of steam-water separation device (20) communicates through ammonia outlet pipe (26) with boiler system, set up seventh governing valve (27) and second pressure sensor (28) on ammonia outlet pipe (26), second pressure sensor (28) and pressure controller (29) electric connection, pressure controller (29) and seventh governing valve (27) electric connection.
7. An anti-fouling urea hydrolysis system according to claim 6, wherein: a drain pipe (36) is arranged at the bottom of the urea hydrolyzer (12), and a ninth regulating valve (37) is arranged on the drain pipe (36).
8. An anti-fouling urea hydrolysis system as set forth in claim 7, wherein: the preheating device comprises a urea solution storage tank heater (7) and a preheating control system, one end of the urea solution storage tank heater (7) is communicated with the auxiliary steam system, and the other end of the urea solution storage tank heater (7) is communicated with the drain tank (31); the preheating control system comprises a preheating temperature control unit, the preheating temperature control unit comprises a first temperature sensor (5), a second regulating valve (9) and a first temperature controller (11), the second regulating valve (9) is arranged on a urea solution storage tank heater (7), the first temperature sensor (5) is electrically connected with the first temperature controller (11), and the first temperature controller (11) is electrically connected with the second regulating valve (9).
9. An anti-fouling urea hydrolysis system as set forth in claim 8, wherein: the preheating control system further comprises a preheating liquid level control unit parallel to the preheating temperature control unit, the preheating liquid level control unit comprises a first liquid level sensor (4) and a first liquid level controller (6), the urea solution storage tank (1) is communicated with the urea dissolving device through a urea solution coming liquid pipe (2), a first regulating valve (3) is arranged on the urea solution coming liquid pipe (2), the first liquid level sensor (4) is electrically connected with the first liquid level controller (6), and the first liquid level controller (6) is electrically connected with the first regulating valve (3).
10. An anti-fouling urea hydrolysis system according to any one of claims 2-9, wherein: the bottom of drain tank (31) sets up drain pipe (33), set up eighth governing valve (34) on drain pipe (33), drain tank (31) inside sets up drain tank liquid level control unit, drain tank liquid level control unit includes second liquid level controller (35) and third liquid level sensor (32), third liquid level sensor (32) and second liquid level controller (35) electric connection, second liquid level controller (35) and eighth governing valve (34) electric connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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