Urea solution mixing device capable of circularly heating solution

Abstract

The utility model discloses a urea solution mixing device capable of circularly heating a solution, and relates to the technical field of engine denitration. The solution mixing device comprises a tank body and a spiral winding pipe arranged on the outer side of the tank body, the bottom end of the tank body is communicated with one end of the spiral winding pipe through a circulating water pump, the other end of the spiral winding pipe is communicated with the tank body, and a closed circulating loop is formed between the tank body and the spiral winding pipe through the circulating water pump; a heating belt for heating the spiral winding pipe is further arranged on the outer side of the tank body; a solution conveying pipe for discharging liquid to the outside is arranged between the circulating water pump and the spiral winding pipe; and the water replenishing port is used for replenishing water into the circulation loop. The mixing efficiency is improved through the turbulence phenomenon of the spiral winding pipe and heating, large-area contact with outside air is avoided in the dissolving and mixing process, and the problems that the contact surface of the urea solution and the air is increased during traditional stirring and mixing, and oxidation failure is caused by contact of the urea solution and the air during long-time stirring are solved.

Description

Technical Field

[0001] This utility model relates to the field of engine denitrification technology, specifically a solution circulation heating urea solution mixing device. Background Technology

[0002] As national regulations on nitrogen oxides (NOx) and other pollutants in flue gas become increasingly stringent, SCR technology has emerged as a primary means of NOx control. SCR stands for Selective Catalytic Reduction. Its working principle involves injecting urea into the exhaust pipe, where nitrogen oxides in the exhaust react with a reducing agent under the action of a catalyst, reducing them to nitrogen and water, thereby reducing NOx emissions.

[0003] The quality of urea solution preparation directly affects the denitrification effect of denitrification equipment. In the past, urea preparation equipment mostly used motor-driven stirring blades to stir the solution. This stirring method often used open tanks, and the contact area between the urea solution and air increased when the blades were stirring. Prolonged stirring caused the urea solution to oxidize and fail, resulting in the urea entering the denitrification equipment not reaching the required concentration, which affected the nitrogen oxide (NOx) treatment effect. Utility Model Content

[0004] The purpose of this invention is to provide a solution circulation heating urea solution mixing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a solution circulation heating urea solution mixing device, comprising a tank and a spiral wound tube disposed on the outside of the tank, wherein the bottom end of the tank is connected to one end of the spiral wound tube via a circulating water pump, and the other end of the spiral wound tube is connected to the tank, and a closed circulation loop is formed between the tank and the spiral wound tube via the circulating water pump;

[0006] The outer side of the tank is also provided with a heating belt for heating the spiral wound tube;

[0007] A solution delivery pipe for discharging liquid to the outside is provided between the circulating water pump and the spiral wound pipe;

[0008] It also includes a water inlet for replenishing water into the circulation loop.

[0009] Preferably, the tank body 1 comprises, from top to bottom, an elliptical end cap, a cylindrical body, and a conical hopper, wherein the elliptical end cap is provided with a feed inlet; and the conical hopper is configured in a funnel shape.

[0010] Preferably, the outlet of the circulating water pump is connected to a three-way pipe, the circulating water pump is connected to the inlet of the three-way pipe, one outlet of the three-way pipe is connected to the inlet of the spiral wound pipe, and the other outlet of the three-way pipe is connected to the inlet of the solution delivery pipe.

[0011] Preferably, multiple spiral wound tubes are used and evenly arranged on the outside of the tank.

[0012] Preferably, the heating band is spirally wound around the outside of the tank and close to the spiral wound tube, and the heating band is disposed between two adjacent spiral wound tubes.

[0013] Preferably, the outer side of the tank is provided with an insulated shell.

[0014] Preferably, the bottom of the tank is also provided with support legs.

[0015] Preferably, a screen is also provided inside the tank.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] In this utility model, the mixed solution inside the tank is pumped into a spiral winding tube by a circulating water pump. As the solution flows through the spiral winding tube, it frequently collides with the outer wall of the tube, increasing turbulence and improving the mixing and dissolving efficiency. Simultaneously, a heating belt heats the spiral winding tube and the mixed solution inside, further enhancing the mixing and dissolving efficiency. The entire mixing and dissolving process does not involve extensive contact with outside air. This mixing and dissolving method breaks through the traditional open-tank stirring method, solving the problem of increased contact area between the urea solution and air during traditional stirring, which leads to oxidation and failure of the urea solution due to prolonged stirring. This ensures the required concentration of urea when it enters the denitrification equipment. Attached Figure Description

[0018] Figure 1 The internal structural plane of this utility model Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of this utility model;

[0020] Figure 3 The internal structural plane of this utility model Figure 2 ;

[0021] Figure 4 This is a schematic diagram of the internal structure of this utility model.

[0022] In the picture:

[0023] 1-Tank body, 11-Elliptical head, 12-Conical hopper, 13-Inlet, 14-Cylinder body, 15-Insulated shell, 16-Support leg, 17-Screen,

[0024] 21-Outlet pipe, 22-Circulating water pump, 23-T-connector, 24-Inlet pipe, 25-Spiral wound pipe, 26-Water inlet, 27-Solution delivery pipe, 28-First valve, 29-Second valve

[0025] 31-Level sensor, 32-Temperature sensor

[0026] 4-Heating belt, 5-Controller. Detailed Implementation

[0027] 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.

[0028] like Figures 1 to 4 As shown, a solution circulation heating urea solution mixing device includes a tank 1 and a spiral wound tube 25 disposed on the outside of the tank 1. The bottom end of the tank 1 is connected to one end of the spiral wound tube 25 through a circulating water pump 22, and the other end of the spiral wound tube 25 is connected to the tank 1. The tank 1 and the spiral wound tube 25 form a closed circulation loop through the circulating water pump 22.

[0029] The outer side of the tank body 1 is also provided with a heating belt for heating the spiral wound tube 25.

[0030] A solution delivery pipe 27 for discharging liquid to the outside is provided between the circulating water pump 22 and the spiral wound pipe 25. The prepared urea solution can be transferred to the outside of the circulation device through the solution delivery pipe 27. Specifically, the solution delivery pipe 27 is connected to the denitrification equipment, and the mixed urea solution is directly transported into the denitrification equipment.

[0031] Specifically, in this embodiment, the tank 1 includes, from top to bottom, an elliptical head 11, a cylindrical body 14, and a conical hopper 12. The elliptical head 11 is provided with a feed inlet 13, through which urea raw material can be added into the tank 1. The conical hopper 12 is configured in a funnel shape, and the inlet of the circulating water pump 22 is connected to the conical opening of the conical hopper 12 through a liquid outlet pipe 21.

[0032] In one specific embodiment, the outlet end of the circulating water pump 22 is connected to a three-way pipe 23, the inlet of the circulating water pump 22 is connected to the inlet of the three-way pipe 23, one outlet of the three-way pipe 23 is connected to the inlet of the spiral wound pipe 25, and the other outlet of the three-way pipe 23 is connected to the inlet of the solution delivery pipe 27.

[0033] Preferably, multiple spiral wound tubes 25 are evenly arranged on the outside of the tank body 1, specifically on the outside of the cylinder body 14, and the liquid inlets of the multiple spiral wound tubes 25 are connected to the liquid outlet of the liquid inlet pipe 24.

[0034] Preferably, the heating band 4 is spirally wound around the outside of the tank body 1 and close to the spiral winding tube 25, and the heating band 4 is disposed between two adjacent spiral winding tubes 25.

[0035] Furthermore, an insulation shell 15 is provided on the outside of the tank body 1. Specifically, the insulation shell 15 is provided on the outside of the cylinder body 14. The insulation shell 15 covers the spiral wound tube 25 and the heating belt 4 and forms an insulation effect. Insulating particles are filled between the insulation shell 15 and the cylinder body 14 to increase the insulation effect.

[0036] Specifically, in this embodiment, the bottom of the tank body 1 is also provided with support legs 16 for supporting the tank body 1.

[0037] Furthermore, a screen 17 is also provided inside the tank body 1, which is used to filter impurities and increase the purity of the solution.

[0038] It also includes a water inlet 26 for replenishing water into the circulation loop. The water inlet 26 is connected to an external water source. After the mixed urea solution is discharged from the device through the solution delivery pipe 27, water is replenished into the circulation loop through the water inlet 26. Urea raw materials are added through the feed inlet 13 to remix the urea raw materials.

[0039] Specifically, in this embodiment, a first valve 28 is provided between the circulating water pump 22 and the three-way pipe 23, a second valve 29 is provided on the solution delivery pipe 27, and a third valve (not shown in the figure) is provided at the water inlet 26. The first valve 28 is used to control the opening and closing of the circulation loop, the second valve 29 is used to control the opening and closing of the solution delivery pipe 27, and the third valve is used to control the opening and closing of the water inlet 26.

[0040] Furthermore, it also includes a liquid level sensor 31 for monitoring the liquid level inside the tank 1 and a temperature sensor 32 for monitoring the temperature of the solution in the circulation loop. Specifically, both the liquid level sensor 31 and the temperature sensor 32 are mounted on the tank 1, and the detection probes of the liquid level sensor 31 and the temperature sensor 32 extend into the tank 1.

[0041] This embodiment also includes a controller 5 for controlling the operation of the circulating water pump 22, heating belt 4, first valve 28, second valve 29, third valve, level sensor 31, and temperature sensor 32. The first valve 28, second valve 29, and third valve are solenoid valves. The controller 5 is mounted on the tank 1. When the solution level in the tank 1 falls below a set level, the level sensor 31 sends a signal to the controller 5, which then controls the third valve to open for automatic water replenishment. Once the set liquid level is reached, the controller closes the third valve. When the solution temperature in the tank 1 falls below a set temperature, the temperature sensor 32 at the bottom of the tank 1 sends a signal to the controller 5, which then controls the heating belt 4 to heat the tank 1 and the spiral wound tube 25. When the solution temperature in the tank 1 reaches the set value, the controller stops the heating belt 4. The controller can be a PLC controller, industrial computer, etc. The specific structure and configuration of these PLC controllers and industrial computers are existing conventional technologies, and their specific details will not be elaborated upon here.

[0042] Specifically, in this embodiment, the tank 1 is also equipped with a pressure balancing valve (not shown in the figure), which is used to balance the pressure between the tank 1 and the outside atmosphere.

[0043] Working Principle: During operation, urea raw material is added to tank 1 through inlet 13. Controller 5 controls the opening of the third valve and adds water to the circulation loop until the water level reaches the preset height in tank 1. Taking the water inside tank 1 as the starting point of the circulation, under the action of circulating water pump 22, the urea raw material and water inside tank 1 sequentially pass through circulating water pump 22, first valve 28, three-way pipe 23, and inlet pipe 24, finally entering the spiral winding tube 25 through inlet pipe 24. As the solution flows through the spiral winding tube 25, it frequently collides with the outer wall of the tube, increasing turbulence and improving the mixing and dissolving efficiency. Simultaneously, heating belt 4 heats the spiral winding tube 25 and the mixed solution inside, further enhancing the mixing and dissolving efficiency. The solution mixed through the spiral winding tube 25 re-enters tank 1, completing one heating and mixing cycle.

[0044] When urea solution is needed, simply open the second valve 29 at the tee pipe 23 above the circulating water pump to send the mixed urea solution into the denitrification equipment.

[0045] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A solution circulation heating and urea solution mixing device, characterized in that: The device includes a tank body and a spiral wound tube disposed on the outside of the tank body. The bottom end of the tank body is connected to one end of the spiral wound tube via a circulating water pump, and the other end of the spiral wound tube is connected to the tank body. The tank body and the spiral wound tube form a closed circulation loop through the circulating water pump. The outer side of the tank is also provided with a heating belt for heating the spiral wound tube; A solution delivery pipe for discharging liquid to the outside is provided between the circulating water pump and the spiral wound pipe; It also includes a water inlet for replenishing water into the circulation loop.

2. The solution circulation heating urea solution mixing device according to claim 1, characterized in that: The tank body 1 comprises, from top to bottom, an elliptical head, a cylindrical body, and a conical hopper. The elliptical head is provided with a feed inlet. The conical hopper is configured in a funnel shape.

3. The solution circulation heating urea solution mixing device according to claim 1, characterized in that: The outlet of the circulating water pump is connected to a three-way pipe. The circulating water pump is connected to the inlet of the three-way pipe. One outlet of the three-way pipe is connected to the inlet of the spiral wound pipe, and the other outlet of the three-way pipe is connected to the inlet of the solution delivery pipe.

4. The solution circulation heating urea solution mixing device according to claim 3, characterized in that: Multiple spiral wound tubes are used and evenly arranged on the outside of the tank.

5. The solution circulation heating urea solution mixing device according to claim 4, characterized in that: The heating band is spirally wound around the outside of the tank and close to the spiral wound tube, with the heating band positioned between two adjacent spiral wound tubes.

6. The solution circulation heating urea solution mixing device according to claim 1, characterized in that: The tank body is provided with an insulated shell on the outside.

7. The solution circulation heating urea solution mixing device according to claim 1, characterized in that: The bottom of the tank is also equipped with support legs.

8. The solution circulation heating urea solution mixing device according to claim 1, characterized in that: The tank is also equipped with a screen.

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