Urea hydrolysis ammonia preparation and denitration integrated device

Abstract

The utility model discloses a urea hydrolysis ammonia production and denitration integrated device, relates to the technical field of industrial flue gas SCR (selective catalytic reduction) urea denitration, and aims to solve the problems that a traditional urea hydrolysis ammonia production process system is various in equipment, scattered in layout and complicated in installation, so that the overall complexity and the cost are increased. The device comprises a urea solution preparation and storage integrated device, and one side of the urea solution preparation and storage integrated device is connected with a drain pump and box integrated device through a first drain valve. And the other side of the urea solution preparation and storage integrated device is connected with a urea hydrolysis temperature and pressure reduction integrated device through a delivery pump and a solution valve.

Description

Technical Field

[0001] The utility model relates to the technical field of SCR urea denitrification of industrial flue gas, in particular to an integrated device for producing ammonia by hydrolyzing urea. Background Art

[0002] The traditional urea hydrolysis ammonia denitrification system's process flow encompasses multiple key links, from urea storage to final ammonia production. These include the urea storage system, the urea solution dissolution and storage system, the hydrolysis reaction system, and subsequent cooling and pressure reduction, precise metering, and distribution systems. This system comprises a vast array of core equipment, including a urea dissolution tank for initial processing, a solution pump for delivery, a urea solution storage tank for intermediate storage, a hydrolyzer as the key reaction equipment, a delivery pump, and a metering and distribution module for precise control. Drain tanks and pumps handle byproducts, and electrical cabinets, instrumentation, pipelines, valves, and various auxiliary materials form a complex operational network.

[0003] However, this traditional process system faces many challenges in its design and implementation: first, the wide variety of equipment and the high degree of interrelationships increase the overall complexity of the system; second, the relatively dispersed layout of the equipment not only increases the floor space but also increases the difficulty of operation and maintenance management; third, the complex installation process and high construction precision requirements further increase the difficulty and cost of project implementation. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model proposes an integrated device and method for urea hydrolysis to produce ammonia and denitrification, including an integrated device for preparing and storing urea solution, one side of the integrated device for preparing and storing urea solution is connected to an integrated device for a drain pump and a tank through a first drain valve, and the other side of the integrated device for preparing and storing urea solution is connected to an integrated device for cooling and reducing pressure for urea hydrolysis through a delivery pump and a solution valve.

[0005] Preferably, the integrated urea solution preparation and storage device includes a solution dissolution storage tank, a heat exchange tube bundle is provided at the bottom of the solution dissolution storage tank, a spray tube bundle is provided at the top of the solution dissolution storage tank, an agitator is provided in the middle of the solution dissolution storage tank, both ends of the heat exchange tube bundle are respectively connected to a first steam trap and a first steam valve, a delivery pump is connected to one side of the solution dissolution storage tank, and a pneumatic delivery pump and a dilution water pump are connected above the solution dissolution storage tank.

[0006] Preferably, the drain pump and tank integrated device includes a drain tank and a drain pump connected thereto.

[0007] Preferably, the urea hydrolysis and temperature reduction and pressure reduction integrated device includes a hydrolyzer, and a second steam valve and a second steam trap are respectively provided at the upper and lower ends of one end of the hydrolyzer where the heat exchange tube bundle passes through the hydrolyzer. An ammonia production valve is provided above the hydrolyzer, and the lower end of the hydrolyzer is connected to the solution dissolution storage tank through a drain valve.

[0008] Preferably, the solution dissolution storage tank is connected to the urea hydrolysis temperature and pressure reduction integrated device via a delivery pump.

[0009] Preferably, the solution dissolution storage tank is connected to the tank integration device through a first drain valve and a drain pump.

[0010] Preferably, the hydrolyzer is connected to the drain pump and tank integrated device through a second drain valve.

[0011] Beneficial effects of the utility model:

[0012] It consists of three core assembly devices: a urea solution preparation and storage assembly device, a urea hydrolysis and cooling and pressure reduction assembly device, and a drain tank and drain pump assembly device. All three are integrated on a sturdy steel structure chassis to achieve a modular design.

[0013] The urea solution preparation and storage combined device consists of a urea solution dissolution and storage integrated tank, a spray tube bundle on the top, an agitator in the middle, and a steam heat exchange tube bundle at the bottom. It improves the preparation efficiency of urea solution, realizes the integration of dissolution and storage, and saves space and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of an integrated device for producing ammonia by hydrolyzing urea and denitrification in the utility model.

[0015] Figure numerals: 1. Urea solution preparation and storage integrated device, 2. Solution dissolution storage tank, 3. Heat exchange tube bundle, 4. Agitator, 5. Delivery pump, 6. Spray tube bundle, 7. First steam trap, 8. First steam valve, 9. Pneumatic feeding valve, 10. Dilution water valve, 11. Urea hydrolysis and temperature reduction integrated device, 12. Hydrolyzer, 13. Ammonia production valve, 14. Drain valve, 15. Solution valve, 16. Steam trap pump and box integrated device, 17. Steam trap box, 18. Steam trap pump, 19. Second steam valve, 20. Second steam trap. DETAILED DESCRIPTION

[0016] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the description. Conversely, these embodiments are provided for the purpose of providing a more thorough and comprehensive understanding of the disclosure of the present application.

[0017] like Figure 1As shown, a urea hydrolysis ammonia production and denitrification integrated device includes a urea solution preparation and storage integrated device 1, one side of the urea solution preparation and storage integrated device 1 is connected to a drain pump and tank integrated device 16 through a first drain valve 7, and the other side of the urea solution preparation and storage integrated device 1 is connected to a urea hydrolysis temperature and pressure reduction integrated device 11 through a delivery pump 5 and a solution valve 15. The above three sets of devices adopt integrated process optimization and modular combination design.

[0018] The urea solution preparation and storage integrated device 1 adopts an innovative integrated design, combining the functions of a traditional urea dissolution tank and a urea solution storage tank to form a comprehensive urea solution dissolution and storage tank, which includes a solution dissolution storage tank 2, a heat exchange tube bundle 3 is provided at the bottom of the solution dissolution storage tank 2, a spray tube bundle 6 is provided at the top of the solution dissolution storage tank 2, and an agitator 4 is provided in the middle of the solution dissolution storage tank 2. The two ends of the heat exchange tube bundle 3 are respectively connected to a first steam trap 7 and a first steam valve 8. A delivery pump 5 is connected to one side of the solution dissolution storage tank 2, and a pneumatic delivery pump 9 and a dilution water pump 10 are connected above the solution dissolution storage tank 2.

[0019] The drain pump and tank integrated device 16 includes a drain tank 17 and a drain pump 18 connected thereto.

[0020] The urea hydrolysis and temperature reduction integrated device 11 includes a hydrolyzer 12. A second steam valve 19 and a steam trap 7 are respectively provided at the upper and lower ends of one end of the hydrolyzer 12 where the heat exchange tube bundle passes through the hydrolyzer 12. An ammonia production valve 13 is provided above the hydrolyzer 12. The lower end of the hydrolyzer 12 is connected to the solution dissolution storage tank 2 through a drain valve 14.

[0021] During use, granular urea is first pumped directly from a tank truck through a pneumatic delivery valve 9 into the solution dissolution storage tank 2. Subsequently, the dilution water valve 10 is opened, and dilution water is evenly sprayed into the solution dissolution storage tank 2 through the top spray pipe bundle 6. The main function of the spray pipe bundle 6 is to reduce the mist generated by heating in the tank and prevent it from overflowing.

[0022] Within the solution dissolution storage tank 2, the urea solution is heated by the heat exchange tube bundle 3 at the bottom, accelerating the dissolution of the urea granules. At this point, the agitator 4 located in the center is activated, primarily to assist dissolution and ensure that the urea granules are fully and evenly dissolved in the dilution water. Once dissolution is complete, the urea solution is stored within the tank, fulfilling the dual functions of dissolution and storage.

[0023] Next, the urea solution is pumped into the urea hydrolysis and temperature and pressure reduction integrated device 11 via a delivery pump 5. Within this device, the urea solution first enters the hydrolyzer 12 shell through a solution valve 15 at the bottom. Subsequently, a second steam valve 19, located on the side, is opened. Steam flows through the heat exchange tube bundle within the hydrolyzer 12, heating the urea solution outside the bundle and promoting a hydrolysis reaction to produce ammonia.

[0024] During the hydrolysis process, if maintenance or shutdown is required, the drain valve 14 at the bottom of the hydrolyzer 12 can be opened to drain the unreacted urea solution back to the solution dissolution storage tank 2 for reuse. The ammonia produced by the hydrolysis enters the furnace area denitration reaction system through the ammonia production valve 13 installed at the top for use in the subsequent denitration process.

[0025] In addition, the water generated during the cooling and decompression process in the solution dissolution storage tank 2 and the hydrolyzer 12 is collected in a water tank and water pump integrated device 16. This device is equipped with a water tank 17 and a water pump 18, which are responsible for recycling and treating the water, realizing the recycling of water resources.

[0026] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A urea hydrolysis ammonia denitrification integrated device, characterized in that: The invention comprises a urea solution preparation and storage integrated device (1), wherein one side of the urea solution preparation and storage integrated device (1) is connected to a drain pump and tank integrated device (16) via a first drain valve (7), and the other side of the urea solution preparation and storage integrated device (1) is connected to a urea hydrolysis temperature reduction and pressure reduction integrated device (11) via a delivery pump (5) and a solution valve (15).

2. The integrated device for producing ammonia by urea hydrolysis and denitrification according to claim 1, characterized in that: The urea solution preparation and storage integrated device (1) comprises a solution dissolution storage tank (2), a heat exchange tube bundle (3) is provided at the bottom of the solution dissolution storage tank (2), a spray tube bundle (6) is provided at the top of the solution dissolution storage tank (2), an agitator (4) is provided in the middle of the solution dissolution storage tank (2), two ends of the heat exchange tube bundle (3) are respectively connected to a first steam trap (7) and a first steam valve (8), one side of the solution dissolution storage tank (2) is connected to a delivery pump (5), and the top of the solution dissolution storage tank (2) is connected to a pneumatic delivery pump (9) and a dilution water pump (10).

3. The integrated device for producing ammonia by hydrolysis of urea according to claim 2, characterized in that: The drain pump and tank integrated device (16) comprises a drain tank (17) and a drain pump (18) connected thereto.

4. The integrated device for producing ammonia by hydrolysis of urea according to claim 1, characterized in that: The urea hydrolysis and temperature reduction and pressure reduction integrated device (11) comprises a hydrolyzer (12); a second steam valve (19) and a second steam trap (20) are respectively provided at the upper and lower ends of one end of the hydrolyzer (12) where the heat exchange tube bundle passes through the hydrolyzer (12); an ammonia production valve (13) is provided above the hydrolyzer (12); and the lower end of the hydrolyzer (12) is connected to a solution dissolution storage tank (2) via a drain valve (14).

5. The integrated device for producing ammonia by hydrolysis of urea according to claim 2, characterized in that: The solution dissolution storage tank (2) is connected to the urea hydrolysis temperature and pressure reduction integrated device (11) via a delivery pump (5).

6. The integrated device for producing ammonia by hydrolysis of urea according to claim 3, characterized in that: The solution dissolution storage tank (2) is connected to the tank integration device (16) via a first drain valve (7) and a drain pump.

7. The integrated device for producing ammonia by hydrolysis of urea according to claim 4, characterized in that: The hydrolyzer (12) is connected to the tank integration device (16) via a second drain valve (20) and a drain pump.

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