Denitration system with cooling structure

Abstract

The utility model provides a denitration system with a cooling structure, which belongs to the technical field of denitration of thermal power plants and comprises a water inlet dividing system and a water mixer. The water inlet dividing system comprises a high-temperature drain pipeline and a demineralized water pipeline, a water inlet of the water mixer is communicated with the high-temperature drain pipeline and the demineralized water pipeline, and a water outlet of the water mixer is communicated with a liquid inlet of the urea slurry preparation tank; the water mixer comprises a shell and a water dispersing structure, the top end of the shell is provided with a high-temperature drain pipeline and a demineralized water pipeline, and the bottom end of the shell is provided with a water outlet communicated with the urea slurry preparation tank; the water dispersing structure comprises a water dispersing plate located in the inner cavity of the shell, and a water drainage hole set is longitudinally formed in the water dispersing plate. According to the denitration system with the cooling structure, provided by the utility model, the denitration water in the cavity below the water dispersing plate is ensured to be within a designed temperature range, so that the problems of pipeline crystallization and blockage caused by over-high temperature of the denitration water and over-fast aging of a mechanical seal of the high-pressure pump are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of denitration in thermal power plants, and more specifically relates to a denitration system with a cooling structure. Background Art

[0002] The original waste incinerator's denitrification water for SNCR (selective non-catalytic reduction) is demineralized water at room temperature. Electric heating is used during preparation to ensure that the urea solution in the urea slurry preparation tank reaches the designed temperature, i.e. 25°C-45°C.

[0003] At present, in order to reduce energy consumption, the high-temperature hydrophobic water in the hydrophobic system of the incinerator is recycled and used as water for preparing urea solution in the SNCR denitrification system. However, during the transformation, the temperature of the high-temperature hydrophobic water is as high as 75℃-95℃. After it is mixed with the denitrification water in the original denitrification system, the temperature of the denitrification water will increase. When the temperature of the high-temperature urea saturated solution drops significantly, the urea solution will precipitate crystals, and the industrial temperature exceeds the long-term design operating temperature of the high-pressure pump seal, resulting in rapid aging and failure of the seal; which in turn leads to problems such as crystallization blockage of the denitrification system pipeline and damage and leakage of the high-pressure pump seal. Utility Model Content

[0004] The purpose of the utility model is to provide a denitration system with a cooling structure, aiming to solve the problem of increased temperature of denitration water caused by recycling high-temperature hydrophobic water.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a denitrification system with a cooling structure, including a water inlet system and a water mixer; the water inlet system includes a high-temperature drain pipe and a desalted water pipe; the water inlet of the water mixer is connected to the high-temperature drain pipe and the desalted water pipe, and the water outlet of the water mixer is connected to the liquid inlet of the urea slurry preparation tank; the water mixer includes a shell and a water dispersion structure, the top end of the shell is provided with a water outlet for connecting the high-temperature drain pipe and the desalted water pipe, and the bottom end of the shell is provided with a water outlet for connecting the urea slurry preparation tank; the water dispersion structure includes a water dispersion plate located in the inner cavity of the shell, and a water hole group is longitudinally opened on the water dispersion plate.

[0006] As another embodiment of the present application, the shell is a cylindrical structure, and the water diffuser is transversely arranged in the shell; the upper end surface of the water diffuser is a conical surface.

[0007] As another embodiment of the present application, the inclination angle of the upper end surface of the water dispersion plate is 15°.

[0008] As another embodiment of the present application, the drain hole group includes an inner circle hole group and several outer circle hole groups, the outer circle hole group is arranged on the outside of the inner circle hole group, and the outer circle hole group and the inner circle hole group are coaxial; the inner circle hole group and the outer circle hole group both include multiple drain holes, and the multiple drain holes located in the same circle are evenly distributed in a circular shape; the aperture of the inner circle hole group is smaller than the aperture of the outer circle hole group.

[0009] As another embodiment of the present application, the water dispersion structure also includes a water flow distributor rotatably arranged at the upper end of the water dispersion plate, and the water flow distributor is coaxial with the water dispersion plate; the water flow distributor has a plurality of evenly distributed guide blades, and the plurality of guide blades rotate clockwise; the starting point rotation angle of the guide blade is 30°.

[0010] As another embodiment of the present application, a supporting structure is provided at the lower portion of the shell, and the upper end of the supporting structure is connected to the lower end of the water dispersion plate.

[0011] As another embodiment of the present application, the inlet end of the water mixer has a mixing pipe, and the high-temperature drain pipe and the desalted water pipe are connected to the mixing pipe via a temperature-controlled mixing valve.

[0012] As another embodiment of the present application, electromagnetic stop valves are provided on both the high-temperature drain pipeline and the desalted water pipeline.

[0013] As another embodiment of the present application, manual stop valves are provided on both the high-temperature drain pipeline and the desalted water pipeline, and the manual stop valves are located upstream of the electromagnetic stop valve.

[0014] The beneficial effect of the denitrification system with a cooling structure provided by the utility model is that: compared with the existing technology, the denitrification system with a cooling structure of the utility model, by arranging a water mixer at the upstream end of the urea slurry preparation tank, low-temperature desalted water and high-temperature hydrophobic water enter the water mixer at the same time, and fall to the upper end of the diffuser plate, and enter the cavity below the diffuser plate through the drain hole group opened on the diffuser plate, thereby promoting the mixing of denitrification water and making the temperature of the denitrification water reach a stable state after mixing; ensuring that the denitrification water in the cavity below the diffuser plate is within the design temperature range, thereby solving the problem of pipeline crystallization blockage caused by excessively high temperature of the denitrification water and the problem of rapid aging of the mechanical seal of the high-pressure pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A process flow chart of a denitration system with a cooling structure provided by an embodiment of the utility model;

[0017] Figure 2 A top view of a water dispersion structure provided in an embodiment of the present utility model.

[0018] In the figure: 1. Desalted water pipeline; 2. High-temperature drain pipeline; 3. Manual stop valve; 4. Solenoid stop valve; 5. Temperature-controlled mixing valve; 6. Mixer; 7. Diffuser; 8. Support structure; 9. Urea slurry preparation tank; 10. High-temperature drain tank; 11. High-temperature drain pump group; 12. Outer circle hole group; 13. Inner circle hole group; 14. Water flow distributor. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] See also Figure 1 and Figure 2 The denitrification system with a cooling structure provided by the present invention is now described. The denitrification system with a cooling structure includes a water inlet system and a water mixer 6; the water inlet system includes a high-temperature drain pipe 2 and a desalted water pipe 1, the water inlet of the water mixer 6 is connected to the high-temperature drain pipe 2 and the desalted water pipe 1, and the water outlet of the water mixer 6 is connected to the liquid inlet of the urea slurry preparation tank 9; the water mixer 6 includes a shell and a water dispersion structure, the top end of the shell is provided with a water outlet for connecting the high-temperature drain pipe 2 and the desalted water pipe 1, and the bottom end of the shell is provided with a water outlet for connecting the urea slurry preparation tank 9; the water dispersion structure includes a water dispersion plate 7 located in the inner cavity of the shell, and a group of water holes is longitudinally opened on the water dispersion plate 7.

[0021] Compared with the prior art, the denitrification system with a cooling structure provided by the present invention has a water mixer 6 provided at the upstream end of the urea slurry preparation tank 9. Low-temperature desalted water and high-temperature hydrophobic water enter the water mixer 6 at the same time and fall to the upper end of the diffuser plate 7. They enter the cavity below the diffuser plate 7 through the drain hole group provided on the diffuser plate 7, thereby promoting the mixing of the denitrification water and making the temperature of the denitrification water reach a stable state after mixing; ensuring that the denitrification water in the cavity below the diffuser plate 7 is within the design temperature range, thereby solving the problem of pipeline crystallization blockage caused by excessively high denitrification water temperature and the problem of excessively rapid aging of the mechanical seal of the high-pressure pump.

[0022] Optionally, the outlet end of the water mixer 6 is connected to a delivery pipeline, and the delivery pipeline connects the water mixer 6 and the water inlet of the urea slurry preparation tank 9 .

[0023] The water mixer 6 is connected to the water inlet system via a mixing pipe. Specifically, the inlet end of the mixing pipe is connected to the high-temperature drain pipe 2 and the desalted water pipe 1 via a three-way valve, and the outlet of the mixing pipe is connected to the water inlet at the upper end of the shell of the water mixer 6.

[0024] The high-temperature hydrophobic water and the desalted water enter the mixing pipe through structures such as a three-way valve. After being mixed in the mixing pipe, the high-temperature hydrophobic water and the desalted water enter the water mixer 6 and are fully mixed in the water mixer 6.

[0025] Optionally, the inlet of the mixing pipe connects to the high-temperature drain pipe 2 and the demineralized water pipe 1 through a temperature-controlled mixing valve 5. This temperature-controlled mixing valve 5 is an automatic temperature-controlled valve, and the system controls the opening of the temperature-controlled mixing valve 5 to achieve automatic control of the two water inflows. Solenoid shut-off valves 4 are installed on both the high-temperature drain pipe 2 and the demineralized water pipe 1. Both the solenoid shut-off valve 4 and the temperature-controlled mixing valve 5 are electrically connected to the same control system to collaboratively control the mixing amount of the high-temperature drain and demineralized water.

[0026] In addition, the high-temperature drain pipe 2 is connected to the high-temperature drain tank 10 , and a high-temperature drain pump group 11 is provided on the high-temperature drain pipe 2 connected to the outlet end of the high-temperature drain tank 10 .

[0027] Manual shut-off valves 3 are installed on both the high-temperature drain pipe 2 and the demineralized water pipe 1, upstream of the electromagnetic shut-off valve 4. The openings of the manual shut-off valves 3 on the demineralized water pipe 1 and the high-temperature drain pipe 2 are manually adjusted to adjust the ratio of demineralized water and high-temperature water used in denitrification, ensuring that the water used for SNCR denitrification preparation and dilution remains at a high temperature between 25°C and 45°C.

[0028] The shell is a cylindrical structure, and the diffuser plate 7 is arranged horizontally in the shell; the upper end face of the diffuser plate 7 is a conical surface. The shell structure can adopt a tank structure of φ500mm×500mm. The diffuser plate 7 is made of a 4mm thick stainless steel plate. The upper end face of the diffuser plate 7 is a conical surface, and the tip of the cone is facing upward, and the inclination angle of the conical surface is 15°. A support structure 8 is provided at the lower part of the shell, and the upper end of the support structure 8 is connected to the lower end of the diffuser plate 7. Optionally, a plurality of support rods are longitudinally arranged on the upper end face of the bottom plate of the shell, and the diffuser plate 7 is installed on the upper end of the support rods. The support structure 8 can be formed by 6 φ10 stainless steel rods evenly distributed around the water outlet.

[0029] The drain hole group includes an inner circle hole group 13 and several outer circle hole groups 12. The outer circle hole group 12 is arranged on the outside of the inner circle hole group 13, and the outer circle hole group 12 and the inner circle hole group 13 are coaxial; the inner circle hole group 13 and the outer circle hole group 12 both include multiple drain holes, and the multiple drain holes located in the same circle are evenly distributed in a ring shape; the aperture of the inner circle hole group 13 is smaller than the aperture of the outer circle hole group 12.

[0030] The plurality of drain hole groups include a plurality of inner circle hole groups 13 and a plurality of outer circle hole groups 12. The inner circle hole groups 13 and the outer circle hole groups 12 are drain holes distributed in a ring shape on the conical surface of the diffuser plate 7 with the central axis of the diffuser plate 7 as the center.

[0031] The multiple drain holes in the inner circle hole group 13 have equal diameters. The multiple drain holes in the outer circle hole group 12 have equal diameters. Optionally, the diffuser plate 7 includes one inner circle hole group 13 and two outer circle hole groups 12, where the drain holes in the inner circle hole group 13 have a diameter of 20 mm and the drain holes in the outer circle hole group 12 have a diameter of 30 mm.

[0032] The water dispersion structure also includes a water flow distributor 14 rotatably arranged at the upper end of the water dispersion plate 7, and the water flow distributor 14 is coaxial with the water dispersion plate 7; the water flow distributor 14 has a plurality of evenly distributed guide blades, and the plurality of guide blades rotate clockwise; the starting point rotation angle of the guide blades is 30°.

[0033] The water distributor 14 is fixedly or rotatably mounted on the conical tip of the water spout 7. It comprises an intermediate shaft and a plurality of guide vanes circumferentially arranged around the intermediate shaft. The guide vanes have curved surfaces and rotate clockwise to agitate the water flow above the water spout 7, increasing mixing and disturbance, and improving the mixing effect. Optionally, the water distributor 14 comprises 12 evenly distributed guide vanes, each 20 mm high and 100 mm long, with a rotation angle of 30° at the starting point of the guide vanes.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A denitrification system with a cooling structure, characterized in that: The invention comprises a water inlet system and a water mixer (6); the water inlet system comprises a high-temperature drain pipe (2) and a desalted water pipe (1); the water inlet of the water mixer (6) is connected to the high-temperature drain pipe (2) and the desalted water pipe (1), and the water outlet of the water mixer (6) is connected to the liquid inlet of a urea slurry preparation tank (9); the water mixer (6) comprises a shell and a water dispersion structure, the top end of the shell is provided with a water outlet for connecting the high-temperature drain pipe (2) and the desalted water pipe (1), and the bottom end of the shell is provided with a water outlet for connecting the urea slurry preparation tank (9); the water dispersion structure comprises a water dispersion plate (7) located in the inner cavity of the shell, and a water hole group is longitudinally provided on the water dispersion plate (7).

2. The denitration system with a cooling structure according to claim 1, characterized in that: The shell is a cylindrical structure, and the water dispersion plate (7) is transversely arranged in the shell; the upper end surface of the water dispersion plate (7) is a conical surface.

3. The denitration system with a cooling structure according to claim 2, characterized in that: The inclination angle of the upper end surface of the water dispersion plate (7) is 15°.

4. The denitration system with a cooling structure according to claim 1, wherein: The drainage hole group comprises an inner circle hole group (13) and a plurality of outer circle hole groups (12), wherein the outer circle hole group (12) is arranged on the outside of the inner circle hole group (13), and the outer circle hole group (12) and the inner circle hole group (13) are coaxial; the inner circle hole group (13) and the outer circle hole group (12) both comprise a plurality of drainage holes, and the plurality of drainage holes located in the same circle are evenly distributed in a circular shape; the aperture of the inner circle hole group (13) is smaller than the aperture of the outer circle hole group (12).

5. The denitration system with a cooling structure according to claim 1 or 2, characterized in that: The water-spreading structure further comprises a water flow distributor (14) rotatably arranged at the upper end of the water-spreading plate (7), wherein the water flow distributor (14) is coaxial with the water-spreading plate (7); the water flow distributor (14) has a plurality of evenly distributed guide blades, and the plurality of guide blades rotate clockwise; the starting point rotation angle of the guide blades is 30°.

6. The denitration system with a cooling structure according to claim 1, characterized in that: A supporting structure (8) is provided at the lower portion of the shell, and the upper end of the supporting structure (8) is connected to the lower end of the water dispersion plate (7).

7. The denitration system with a cooling structure according to claim 1, characterized in that: The inlet end of the water mixer (6) is provided with a water mixing pipe, and the high-temperature drain pipe (2) and the desalted water pipe (1) are connected to the water mixing pipe via a temperature-controlled water mixing valve (5).

8. The denitration system with a cooling structure according to claim 1, characterized in that: The high-temperature drain pipe (2) and the desalted water pipe (1) are both provided with electromagnetic stop valves (4).

9. The denitration system with a cooling structure according to claim 8, characterized in that: The high-temperature drain pipe (2) and the desalted water pipe (1) are both provided with a manual stop valve (3), and the manual stop valve (3) is located upstream of the electromagnetic stop valve (4).

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