A purification and separation device for urea hydrolysate in a desulfurization and denitrification system

Abstract

The utility model provides a kind of purification and separation device of urea hydrolysate in desulfurization and denitrification system, including pump, air cooling heat exchanger, outer clamp type flowmeter, first thermometer, second thermometer, filter, first pressure gauge, second pressure gauge, pipeline and electric ball valve;Air cooling heat exchanger, filter and pump are connected to form processing loop by pipeline, and processing loop outlet is communicated with urea hydrolysis reactor import, and processing loop is used to cool, filter and cycle processing to the solution of urea hydrolysis reactor outlet.The device is installed in the import of urea hydrolysis reactor and operates, and the solution at the outlet of urea hydrolysis reactor is cooled and treated, so that it crystallizes, and the solid impurities of its solution are intercepted using metal filter.When the solution passes through filter core, such as not completely hydrolyzed urea particle, rust etc., can be intercepted by filter core, so as to realize the preliminary separation of impurities;Device structure is simple, cost is lower, easy to install and maintain.

Description

Technical Field

[0001] This utility model relates to the field of water purification technology, specifically to a purification and separation device for urea hydrolysate in a desulfurization and denitrification system. Background Technology

[0002] With increasingly stringent environmental protection requirements, the development of desulfurization and denitrification technologies is crucial for the power industry, a key sector for pollutant emissions. Urea hydrolysis, due to its advantages such as high safety and no transportation or storage risks, has gradually become the mainstream technology for selective catalytic reduction (SCR) denitrification systems in the power industry. However, during the desulfurization and denitrification process in the power industry, the gas produced by the urea hydrolysis reactor often contains various impurities, such as incompletely hydrolyzed urea particles, water vapor, organic impurities, and metal ions generated by equipment corrosion. If these impurities are not separated in a timely manner, they will negatively impact the stable operation and denitrification efficiency of the subsequent denitrification system. Therefore, it is necessary to purify and separate the solution in the urea hydrolysis reactor to ensure the stable operation and efficient denitrification of the system. Utility Model Content

[0003] The purpose of this invention is to provide a purification and separation device that is simple in structure, low in cost and easy to maintain, which can cool, filter and circulate the solution at the outlet of the urea hydrolysis reactor to effectively remove solid impurities.

[0004] To achieve the above objectives, this utility model proposes the following technical solution: a purification and separation device for urea hydrolysate in a desulfurization and denitrification system, comprising a pump, an air-cooled heat exchanger, an external clamp-on flow meter, a first thermometer, a second thermometer, a filter, a first pressure gauge, a second pressure gauge, pipelines, and an electric ball valve; the air-cooled heat exchanger, filter, and pump are connected through the pipeline to form a processing loop, the inlet of the processing loop is connected to the outlet of the urea hydrolysis reactor, and the outlet of the processing loop is connected to the inlet of the urea hydrolysis reactor; the processing loop is used to cool, filter, and circulate the solution at the outlet of the urea hydrolysis reactor.

[0005] Furthermore, in this invention, the air-cooled heat exchanger is used to cool the solution at the outlet of the urea hydrolysis reactor, causing urea or impurities in the solution to crystallize and precipitate. The air-cooled heat exchanger is connected to the outlet of the urea hydrolysis reactor via a pipeline. The pipeline is equipped with an external clamp-on flow meter, a first thermometer, and an electric ball valve. The external clamp-on flow meter is used to monitor the flow rate of the solution. A sampling tube is also connected to the pipeline. The sampling tube is equipped with a ball valve and has a sampling port.

[0006] Furthermore, in this invention, the filter is located downstream of the air-cooled heat exchanger and is connected to the air-cooled heat exchanger via a pipe. It is used to intercept solid impurities in the solution. A second thermometer and a ball valve are installed on the pipe. The first thermometer and the second thermometer are used to monitor the temperature change of the solution before and after the heat exchanger.

[0007] Furthermore, in this invention, the filter includes a filter housing and a filter element, the filter element being disposed inside the filter housing for trapping incompletely hydrolyzed urea particles and solid impurities such as rust in the solution.

[0008] Furthermore, in this invention, the pump is located downstream of the filter and connected to the filter via a pipeline. The pipeline is equipped with a first pressure gauge and a ball valve. The pump is used to pump the filtered solution back to the urea hydrolysis reactor to form a circulation loop.

[0009] Furthermore, in this utility model, the pump is connected to the urea hydrolysis reactor via a pipeline, and a second pressure gauge and an electric ball valve are installed on the pipeline. The first pressure gauge and the second pressure gauge detect the pressure difference to determine whether the filter element needs backwashing. Furthermore, in this invention, the filter is connected to a backwash branch, and a ball valve is provided on the backwash branch to control the opening and closing of the backwash branch.

[0010] Beneficial effects: The technical solution of this application has the following technical effects: This device operates at the inlet of the urea hydrolysis reactor, cooling the solution at the reactor's outlet to induce crystallization. A metal filter then intercepts solid impurities in the solution. As the solution passes through the filter element, incompletely hydrolyzed urea particles, rust, and other contaminants are retained, achieving initial impurity separation. Finally, a pump returns the solution to the urea hydrolysis reactor. This device is simple in structure, low in cost, and easy to install and maintain.

[0011] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0012] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0013] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram illustrating the principle of this utility model.

[0015] The meanings of the labels in the figure are as follows: 1. Pump; 2. Air-cooled heat exchanger; 3. Clamp-on flow meter; 4. First thermometer; 5. Second thermometer; 6. Filter; 7. First pressure gauge; 8. Second pressure gauge. Detailed Implementation

[0016] To better understand the technical content of this utility model, specific embodiments are described below in conjunction with the accompanying drawings. Various aspects of this utility model are described in this disclosure with reference to the accompanying drawings, which illustrate numerous illustrative embodiments. The embodiments of this disclosure are not necessarily defined to include all aspects of this utility model. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in this utility model are not limited to any particular implementation. Furthermore, some aspects of this utility model can be used alone or in any suitable combination with other aspects disclosed in this utility model.

[0017] like Figure 1-2 As shown, this utility model provides a purification and separation device for urea hydrolysate in desulfurization and denitrification systems in the power industry. It aims to effectively remove solid impurities from the urea hydrolysis reactor outlet solution through cooling, filtration and circulation treatment, so as to improve the stability and efficiency of the denitrification system.

[0018] The purification and separation device in this embodiment includes a pump 1, an air-cooled heat exchanger 2, a clamp-on flow meter 3, a first thermometer 4, a second thermometer 5, a filter 6, a first pressure gauge 7, a second pressure gauge 8, pipes, an electric ball valve, and an electrical control box. The air-cooled heat exchanger 2, the filter 6, and the pump 1 are connected by pipes to form a processing loop. The inlet of the processing loop is connected to the outlet of the urea hydrolysis reactor, and the outlet of the processing loop is connected to the inlet of the urea hydrolysis reactor. The processing loop is used to cool, filter, and circulate the solution at the outlet of the urea hydrolysis reactor.

[0019] Pump 1 provides power to the unit, pumping the filtered solution back to the urea hydrolysis reactor to create a circulating flow of the solution. This ensures that impurities are thoroughly filtered and improves the system's operating efficiency. Pump 1 is connected to the outlet of filter 6 via a stainless steel pipe, located downstream of filter 6. Its outlet is directly connected to the inlet of the urea hydrolysis reactor via another stainless steel pipe. The pump is electrically connected to the control box, which controls its start-up, shutdown, and operating speed to adapt to flow requirements under different operating conditions.

[0020] Air-cooled heat exchanger 2 is used to cool the high-temperature solution at the outlet of the urea hydrolysis reactor, causing urea or impurities in the solution to crystallize and precipitate at a lower temperature, thus facilitating subsequent filtration. Its advantages include high cooling efficiency, compact structure, and suitability for continuous operation in industrial environments. Air-cooled heat exchanger 2 is located downstream of the urea hydrolysis reactor outlet and is directly connected to the reactor outlet via a stainless steel pipe. Its outlet is then connected in sequence to filter 6 and pump 1 via another stainless steel pipe. The operating status of heat exchanger 2 is monitored and adjusted through an electrical control box to ensure stable cooling performance.

[0021] The clamp-on flow meter 3 is installed on the pipeline between the air-cooled heat exchanger 2 and the urea hydrolysis reactor to monitor the flow rate of the solution in the loop in real time, providing data support for system operation and facilitating operators to adjust operating parameters according to flow rate changes. Its non-contact design avoids corrosion and blockage problems inside the pipeline, and has the advantages of simple installation and low maintenance cost.

[0022] The first thermometer 4 and the second thermometer 5 are used to monitor the solution temperature at the inlet and outlet of the air-cooled heat exchanger 2, respectively, to ensure the controllability of the cooling process and the crystallization effect. Their advantage lies in providing accurate temperature data, facilitating timely adjustments to the operating parameters of the heat exchanger 2 by operators. The first thermometer 4 is installed on a stainless steel pipe at the inlet of the air-cooled heat exchanger 2; the second thermometer 5 is installed on a stainless steel pipe at the outlet of the air-cooled heat exchanger 2. Both thermometers are electrically connected to the control box via signal lines, transmitting temperature data to the control box for real-time monitoring.

[0023] Filter 6 consists of a filter housing and an internal filter element, used to intercept solid impurities in the solution, such as incompletely hydrolyzed urea particles and rust. Its advantages include high filtration efficiency and the ability to periodically backwash the filter element to extend its service life. Filter 6 is connected to the outlet of the air-cooled heat exchanger 2 via a stainless steel pipe, and its outlet is connected to the pump 1 via a stainless steel pipe.

[0024] The filter 6 is also equipped with a first pressure gauge 7 at the inlet and outlet. The pump 1 is connected to the urea hydrolysis reactor through a pipeline. A second pressure gauge 8 and an electric ball valve are installed on the pipeline. The first pressure gauge 7 and the second pressure gauge 8 detect the pressure difference to determine whether the filter element needs backwashing. The first pressure gauge 7 and the second pressure gauge 8 are connected to the electrical control box through signal lines to transmit the pressure difference data to the electrical control box. The operator can determine whether the backwashing branch needs to be opened based on the pressure difference value.

[0025] The working principle of this device is as follows: The high-temperature solution from the urea hydrolysis reactor outlet enters the air-cooled heat exchanger 2 through a stainless steel pipe. The solution cools in the heat exchanger, promoting the crystallization and precipitation of urea or impurities. The first thermometer 4 and the second thermometer 5 monitor the inlet and outlet temperatures of the heat exchanger 2, respectively, and the data is transmitted to the electrical control box to optimize the cooling process. The cooled solution is measured by an external clamp-on flow meter 3, and its flow rate data is transmitted to the electrical control box to monitor the loop operation. Subsequently, the solution enters the filter 6, where the filter element intercepts incompletely hydrolyzed urea particles, rust, and other solid impurities. The first pressure gauge 7 and the second pressure gauge 8 detect the pressure difference to determine whether the filter element needs backwashing. The filtered solution is pumped back to the urea hydrolysis reactor by pump 1, forming a closed loop. After a period of circulation, solid impurities in the solution are effectively removed, ensuring the stable operation and efficient denitrification of the denitrification system.

[0026] In this embodiment, all components form a closed loop through stainless steel pipes, and signal transmission is precisely controlled via an electrical control box, ensuring the reliability and efficiency of the device in purifying urea hydrolysate. The device has a simple structure and is easy to maintain, making it particularly suitable for desulfurization and denitrification systems in the power industry. It effectively addresses the impact of solid impurities on the denitrification system, meeting the practical needs of industrial applications.

[0027] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Since this application is mainly used to protect mechanical devices, this application will not explain the control method and circuit connection in detail.

[0028] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A purification and separation device for urea hydrolysate in a desulfurization and denitrification system, characterized in that, The system includes a pump (1), an air-cooled heat exchanger (2), a clamp-on flow meter (3), a first thermometer (4), a second thermometer (5), a filter (6), a first pressure gauge (7), a second pressure gauge (8), pipes, and an electric ball valve. The air-cooled heat exchanger (2), the filter (6), and the pump (1) are connected by pipes to form a processing loop. The inlet of the processing loop is connected to the outlet of the urea hydrolysis reactor, and the outlet of the processing loop is connected to the inlet of the urea hydrolysis reactor. The processing loop is used to cool, filter, and circulate the solution at the outlet of the urea hydrolysis reactor.

2. The purification and separation device for urea hydrolysate in a desulfurization and denitrification system according to claim 1, characterized in that, The air-cooled heat exchanger (2) is used to cool the solution at the outlet of the urea hydrolysis reactor, so that the urea or impurities in the solution crystallize out. The air-cooled heat exchanger (2) is connected to the outlet of the urea hydrolysis reactor through a pipeline. An external clamp flow meter (3), a first thermometer (4) and an electric ball valve are installed on the pipeline. The external clamp flow meter (3) is used to monitor the flow rate of the solution. A sampling tube is also connected to the pipeline. A ball valve is installed on the sampling tube. The sampling tube has a sampling port.

3. The purification and separation device for urea hydrolysate in a desulfurization and denitrification system according to claim 2, characterized in that, The filter (6) is located downstream of the air-cooled heat exchanger (2) and is connected to the air-cooled heat exchanger (2) through a pipe. It is used to intercept solid impurities in the solution. A second thermometer (5) and a ball valve are installed on the pipe. The first thermometer (4) and the second thermometer (5) are used to monitor the temperature change of the solution before and after the heat exchanger (2).

4. The purification and separation device for urea hydrolysate in a desulfurization and denitrification system according to claim 3, characterized in that, The filter (6) includes a filter housing and a filter element, wherein the filter element is disposed inside the filter housing and is used to trap incompletely hydrolyzed urea particles and rust solid impurities in the solution.

5. The purification and separation device for urea hydrolysate in a desulfurization and denitrification system according to claim 4, characterized in that, The pump (1) is located downstream of the filter (6) and is connected to the filter (6) via a pipe. A first pressure gauge (7) and a ball valve are installed on the pipe. The pump (1) is used to pump the filtered solution back to the urea hydrolysis reactor to form a circulation loop.

6. The purification and separation device for urea hydrolysate in a desulfurization and denitrification system according to claim 5, characterized in that, The pump (1) is connected to the urea hydrolysis reactor through a pipeline. A second pressure gauge (8) and an electric ball valve are installed on the pipeline. The first pressure gauge (7) and the second pressure gauge (8) detect the pressure difference to determine whether the filter element needs backwashing.

7. The purification and separation device for urea hydrolysate in a desulfurization and denitrification system according to claim 6, characterized in that, The filter (6) is connected to a backwash branch, and a ball valve is provided on the backwash branch. The ball valve is used to control the opening and closing of the backwash branch.

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