Urea hydrolysis reactor utilizing hydrophobicity

Abstract

The utility model relates to the technical field of urea hydrolysis reaction devices, and discloses a urea hydrolysis reactor utilizing drain water, which comprises a urea hydrolyzer, a drain water booster pump is arranged in a pipeline between one end of a drain water outlet valve and a pipeline mixer, and the pipeline mixer is externally connected with a demineralized water inlet valve. Steam passes through a unit steam inlet valve and a unit steam inlet adjusting valve, a demineralized water inlet valve is opened at the same time, unit steam and demineralized water form saturated steam of 0.7 MPa / 170 DEG C in a pipeline mixer, the saturated steam is conveyed to a hydrolyzer heating coil and a steam blowing system through a steam outlet valve, under the action of a drainage booster pump, drainage pressure is increased to about 1.0 MPa, and the steam blowing system blows steam to the hydrolyzer heating coil. And saturated steam with the pressure of 0.7 MPa / 170 DEG C is continuously formed in the pipeline mixer with steam of the unit through the drainage inlet valve, and the urea solution is heated in the hydrolyzer heating coil through the hot steam inlet valve and the hot steam inlet adjusting valve after passing through the steam outlet valve.

Description

Technical Field

[0001] This utility model relates to the technical field of urea hydrolysis reaction device, specifically a hydrophobic urea hydrolysis reactor. Background Technology

[0002] A urea hydrolysis system is a system used to decompose urea (its main component is urea, with the chemical formula CO(NH2)2) into ammonia (NH3) and carbon dioxide (CO2). It is widely used in many fields, especially in industry, environmental protection, and chemical engineering.

[0003] For example, a hydrophobic urea hydrolysis reactor, disclosed in CN220919218U, includes a reactor shell. One end of the reactor shell is separated by a flange to form a tubular body and a heating zone. The heating zone is divided into a heating area and a preheating area. The tubular body is connected to the preheating area via a steam condensate pipe. Above the heating zone of the reactor shell is a gas phase space, and below is a liquid phase space. The liquid phase space is separated into the heating area and the preheating area by a partition. A heating coil is installed within the heating area of ​​the reactor shell, connected to the flange and communicating with the tubular body. By incorporating a steam condensate pipe, not only can the urea solution be heated using steam condensate, reducing steam consumption and improving steam utilization, thus saving energy and costs, but the system is also simple, easy to manufacture, and convenient to maintain.

[0004] The aforementioned patent proposes that by setting up a steam condensate pipe, the urea solution can be heated by steam condensate, thereby reducing steam consumption and improving steam utilization. However, in actual use, the substances produced by urea hydrolysis are not cleaned after the reaction, which can easily lead to the accumulation of substances inside the reactor, affecting the subsequent hydrolysis reaction and making it inconvenient to use. Utility Model Content

[0005] The purpose of this invention is to provide a hydrophobic urea hydrolysis reactor to solve the problem mentioned in the background art that the substances produced by urea hydrolysis are not cleaned after the reaction, which easily leads to the accumulation of substances inside the reactor.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hydrophobic urea hydrolysis reactor, comprising a urea hydrolyzer, wherein a hydrophobic outlet valve is installed on the outer wall of the urea hydrolyzer, and a unit cold section steam group, a pipeline mixer, a urea storage tank, wastewater pool A, wastewater pool B and a nitrogen supply system are provided on the outside of the urea hydrolyzer, and a hydrophobic booster pump is installed in the pipeline between one end of the hydrophobic outlet valve and the pipeline mixer;

[0007] The unit's steam inlet valve and steam inlet regulating valve are installed in the pipeline between the unit's cold section steam group and the pipeline mixer, and the pipeline mixer is externally connected to a demineralized water inlet valve.

[0008] Preferably, the pipeline installed between the outside of the pipeline mixer and the urea hydrolyzer is equipped with a hot steam outlet valve, a hot steam inlet valve, and a hot steam inlet regulating valve, and a hydrolyzer heating coil is installed at the lower end of the urea hydrolyzer.

[0009] Preferably, a gas phase pressure relief pipe is installed on the outside of the urea hydrolyzer, one end of the gas phase pressure relief pipe is located above the wastewater tank A, and a gas phase pressure relief valve is installed at the middle end of the gas phase pressure relief pipe.

[0010] Preferably, a product gas outlet pipe and a liquid phase reflux pipe are installed on the outside of the urea hydrolyzer. One end of the product gas outlet pipe is installed in the nitrogen supply system, and a product gas outlet regulating valve and a product gas outlet shut-off valve are installed in the middle of the product gas outlet pipe. One end of the liquid phase reflux pipe is installed in the urea storage tank, and a liquid phase reflux valve and a liquid phase reflux regulating valve are installed in the middle of the liquid phase reflux pipe.

[0011] Preferably, the pipes installed on the outside of the pipe mixer are connected to a gas phase pressure relief pipe, a product gas outlet pipe, a liquid phase reflux pipe, and a sewage discharge pipe.

[0012] Preferably, a surface drain valve and a liquid phase drain valve are installed at the middle of the drain pipe and near the end installed in the urea hydrolyzer, and a drain control valve is installed at the middle of the end of the drain pipe near the wastewater tank B.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The present invention discloses a hydrophobic urea hydrolysis reactor, which uses the pressure and temperature of the unit steam to vaporize the hydrophobic water generated in the hydrolyzer into saturated steam that meets the requirements. This can maximize the utilization of hydrophobic water and reduce the waste of high-quality water resources, as well as reduce the amount of unit steam used. Moreover, the unit steam does not need to pass through a desuperheating and pressure reducing device, which also makes full use of high-temperature and high-pressure steam and reduces heat loss.

[0015] 2. The present invention discloses a hydrophobic urea hydrolysis reactor, in which the saturated steam generated can be used to purge the gas phase pressure relief pipe, product gas outlet pipe, liquid phase reflux pipe and sewage discharge pipe of the hydrolyzer after the reaction, so as to prevent unreacted urea residue from being discharged from the reactor. Attached Figure Description

[0016] Figure 1 This is a block diagram of the overall system of this utility model;

[0017] Figure 2 This is a block diagram of the cold section steam unit of this utility model;

[0018] Figure 3 This is a block diagram of the urea hydrolyzer of this utility model;

[0019] Figure 4 This is a block diagram of the pipe mixer of this utility model.

[0020] In the diagram: 1. Urea hydrolyzer; 11. Hydrolyzer heating coil; 12. Drain outlet valve; 13. Drain booster pump; 14. Drain inlet valve; 15. Gas phase pressure relief pipe; 151. Gas phase pressure relief valve; 16. Product gas outlet pipe; 161. Product gas outlet regulating valve; 162. Product gas outlet shut-off valve; 17. Liquid phase reflux pipe; 171. Liquid phase reflux valve; 172. Liquid phase reflux regulating valve; 18. Drain pipe; 181. Surface drain valve; 182. Liquid phase drain valve; 183. Drain 1. Wastewater control valve; 2. Cold section steam unit; 21. Steam inlet valve; 22. Steam inlet regulating valve; 23. Demineralized water inlet valve; 3. Pipeline mixer; 31. Hot steam outlet valve; 32. Hot steam inlet valve; 33. Hot steam inlet regulating valve; 34. Steam purge valve A; 35. Steam purge valve B; 36. Steam purge valve C; 37. Steam purge valve D; 38. Steam purge valve E; 4. Urea storage tank; 5. Wastewater tank A; 6. Wastewater tank B; 7. Ammonia supply system. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1: Please refer to Figures 1-3 A hydrophobic urea hydrolysis reactor includes a urea hydrolyzer 1, a hydrophobic outlet valve 12 installed on the outer wall of the urea hydrolyzer 1, and a unit cold section steam group 2, a pipeline mixer 3, a urea storage tank 4, a wastewater pool A5, a wastewater pool B6 and a nitrogen supply system 7 located on the outside of the urea hydrolyzer 1. A hydrophobic booster pump 13 is installed in the pipeline between one end of the hydrophobic outlet valve 12 and the pipeline mixer 3.

[0023] A unit steam inlet valve 21 and a unit steam inlet regulating valve 22 are installed in the pipeline between the unit's cold section steam group 2 and the pipeline mixer 3. A demineralized water inlet valve 23 is connected externally to the pipeline mixer 3. Steam and demineralized water mix inside the pipeline mixer 3 to form saturated steam. During the urea hydrolysis reaction, the ammonia and carbon dioxide produced react with water to generate ammonia water and carbonates. If the solution concentration inside the reactor is too high, especially under high temperature and high pressure conditions, salts (such as ammonium bicarbonate and ammonium chloride) easily crystallize and deposit on the pipes and reactor walls, forming scale. This scaling reduces heat exchange efficiency, increases the risk of equipment corrosion and blockage, and may even lead to equipment failure. Using demineralized water can effectively maintain the equipment.

[0024] The pipeline between the outside of the pipe mixer 3 and the urea hydrolyzer 1 is equipped with a hot steam outlet valve 31, a hot steam inlet valve 32 and a hot steam inlet regulating valve 33. The lower end of the urea hydrolyzer 1 is equipped with a hydrolyzer heating coil 11, and the hot steam heats the urea solution in the hydrolyzer heating coil 11.

[0025] In this embodiment: the steam from the cold section steam group 2 of the unit is adjusted to about 1.0 MPa through the unit steam inlet valve 21 and the unit steam inlet regulating valve 22. At the same time, the demineralized water inlet valve 23 is opened. The unit steam and demineralized water form saturated steam at 0.7 MPa / 170°C in the pipeline mixer 3. After the system generates condensate, as the condensate is generated, the condensate pressure is increased to about 1.0 MPa through the condensate outlet valve 12 under the action of the condensate booster pump 13. Through the condensate inlet valve 14, it continuously forms saturated steam at 0.7 MPa / 170°C with the unit steam in the pipeline mixer 3. After passing through the steam outlet valve, it heats the urea solution in the hydrolyzer heating coil 11 through the hot steam inlet valve 32 and the hot steam inlet regulating valve 33.

[0026] Example 2: This example is an improvement upon Example 1. For details, please refer to [link / reference]. Figures 2-4 A gas phase pressure relief pipe 15 is installed on the outside of the urea hydrolyzer 1. One end of the gas phase pressure relief pipe 15 is located above the wastewater tank A5. A gas phase pressure relief valve 151 is installed in the middle of the gas phase pressure relief pipe 15. When the gas phase pressure relief pipe 15 is depressurized, it will contain liquid. The wastewater tank A5 is set up to collect the liquid in a centralized manner.

[0027] The urea hydrolyzer 1 is equipped with a product gas outlet pipe 16 and a liquid phase reflux pipe 17 on its outer side. One end of the product gas outlet pipe 16 is installed in the nitrogen supply system 7, and the middle end of the product gas outlet pipe 16 is equipped with a product gas outlet regulating valve 161 and a product gas outlet shut-off valve 162. One end of the liquid phase reflux pipe 17 is installed in the urea storage tank 4, and the middle end of the liquid phase reflux pipe 17 is equipped with a liquid phase reflux valve 171 and a liquid phase reflux regulating valve 172. The substances produced by the hydrolysis reaction are utilized to reduce resource waste.

[0028] The pipes installed on the outside of the pipe mixer 3 are connected to the gas phase pressure relief pipe 15, the product gas outlet pipe 16, the liquid phase return pipe 17, and the drain pipe 18. The saturated steam generated inside the pipe mixer 3 can purge the gas phase pressure relief pipe 15, the product gas outlet pipe 16, the liquid phase return pipe 17, and the drain pipe 18 to ensure their cleanliness.

[0029] A surface drain valve 181 and a liquid phase drain valve 182 are installed in the middle of the drain pipe 18 and near the end installed in the urea hydrolyzer 1. A drain control valve 183 is installed in the middle of the end of the drain pipe 18 near the wastewater tank B6. The drain control valve 183 is used to control the discharge of impurities.

[0030] In this embodiment, the urea solution undergoes hydrolysis at 0.7 MPa / 170°C inside the urea hydrolyzer 1. The gas phase pressure relief pipe 15 ensures the internal balance of the urea hydrolyzer 1. Ammonia gas is discharged into the nitrogen supply system 7 through the product gas outlet pipe 16. The urea solution contains impurities, which can be discharged through the drain pipe 18. After hydrolysis, steam purge valves A34, B35, E38, C36, and D37 can be opened to purge the gas phase pressure relief pipe 15, product gas outlet pipe 16, liquid phase reflux pipe 17, and drain pipe 18 of the hydrolyzer with steam. Purge helps to remove unreacted urea residues from the reactor, preventing them from interfering with subsequent reactions or causing equipment blockage.

[0031] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydrophobic urea hydrolysis reactor, comprising a urea hydrolyzer (1), characterized in that: The outer wall of the urea hydrolyzer (1) is equipped with a condensate outlet valve (12). The outer side of the urea hydrolyzer (1) is provided with a unit cold section steam group (2), a pipeline mixer (3), a urea storage tank (4), a wastewater pool A (5), a wastewater pool B (6), and a nitrogen supply system (7). A condensate booster pump (13) is installed in the pipeline between one end of the condensate outlet valve (12) and the pipeline mixer (3). The unit steam inlet valve (21) and the unit steam inlet regulating valve (22) are installed in the pipeline between the unit cold section steam group (2) and the pipeline mixer (3), and the pipeline mixer (3) is externally connected to the demineralized water inlet valve (23).

2. The hydrophobic urea hydrolysis reactor according to claim 1, characterized in that: The pipeline between the outside of the pipeline mixer (3) and the urea hydrolyzer (1) is equipped with a hot steam outlet valve (31), a hot steam inlet valve (32) and a hot steam inlet regulating valve (33). The lower end of the urea hydrolyzer (1) is equipped with a hydrolyzer heating coil (11).

3. The hydrophobic urea hydrolysis reactor according to claim 2, characterized in that: A gas phase pressure relief pipe (15) is installed on the outside of the urea hydrolyzer (1). One end of the gas phase pressure relief pipe (15) is above the wastewater tank A (5), and a gas phase pressure relief valve (151) is installed in the middle of the gas phase pressure relief pipe (15).

4. The hydrophobic urea hydrolysis reactor according to claim 3, characterized in that: The urea hydrolyzer (1) is equipped with a product gas outlet pipe (16) and a liquid phase reflux pipe (17) on its outer side. One end of the product gas outlet pipe (16) is installed in the nitrogen supply system (7). The middle end of the product gas outlet pipe (16) is equipped with a product gas outlet regulating valve (161) and a product gas outlet shut-off valve (162). One end of the liquid phase reflux pipe (17) is installed in the urea storage tank (4). The middle end of the liquid phase reflux pipe (17) is equipped with a liquid phase reflux valve (171) and a liquid phase reflux regulating valve (172).

5. A hydrophobic urea hydrolysis reactor according to claim 4, characterized in that: The pipes installed on the outside of the pipe mixer (3) are connected to the gas phase pressure relief pipe (15), the product gas outlet pipe (16), the liquid phase reflux pipe (17), and the sewage pipe (18).

6. A hydrophobic urea hydrolysis reactor according to claim 5, characterized in that: A surface drain valve (181) and a liquid phase drain valve (182) are installed at the middle of the drain pipe (18) and near the end installed in the urea hydrolyzer (1). A drain control valve (183) is installed at the middle of the end of the drain pipe (18) near the wastewater pool B (6).

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