Novel urea solution pyrolysis device
By using technical means such as heating components and deflectors in the urea solution pyrolysis device, the problem of small contact area between hot flue gas and urea solution is solved, and the sufficient pyrolysis reaction of urea solution is achieved, reducing power consumption and operating costs are reduced. .
Patent Information
- Application Number
- CN202420369774.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-28
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-02-28
AI Technical Summary
During the pyrolysis reaction of the urea pyrolysis device for existing gas boilers, the contact area between the hot flue gas and the urea solution is small, resulting in insufficient pyrolysis reaction and low uniformity, resulting in high power consumption and high operating cost of urea pyrolysis.
A new urea solution pyrolysis device was designed. Heat was introduced into the heating chamber through the heating assembly to replenish the heat of the flue gas, and the flue gas was divided into small streams of air by using the deflector. The liquid spraying plate increased the spray area of the urea solution. Ensure adequate pyrolysis reaction.
The sufficient pyrolysis reaction between flue gas and urea solution is achieved, the pyrolysis power consumption of urea is reduced, the reaction uniformity is improved, and the operating cost is reduced.
Smart Images
Figure CN222151516U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of urea pyrolysis, in particular to a novel urea solution pyrolysis device. Background Art
[0002] When the fuel of coal-fired boilers in power plants is burned, a large amount of nitrogen oxides will be generated. Nitrogen oxides are the main pollutants in the atmosphere and have many hazards: direct harm to human health; participation in the formation of photochemical smog, acid rain, and environmental pollution; nitrous oxide is a greenhouse gas that will destroy the ozone layer. Therefore, coal-fired boilers in power plants need to adopt a denitrification system. The selective catalytic reduction SCR system is the main denitrification system currently used, that is, under the action of the catalyst, the reducing agent ammonia or urea is injected to reduce the NOx in the tail gas to N2 and H2O.
[0003] After searching, the Chinese patent document application number: 202022344540.5 discloses a urea pyrolysis device for gas boilers, including an SCR reactor, a flue is fixedly connected to the top of the SCR reactor, an ammonia injection grid is arranged inside the flue, a manual regulating valve is arranged on the pipe outside the flue, a pyrolysis furnace is fixedly connected to the left side of the flue, an electric heater is fixedly connected to the top of the pyrolysis furnace, and a high-temperature booster fan is fixedly connected to the left side of the electric heater. This urea pyrolysis device for gas boilers is used for the first time on a coal-fired gas boiler in a steel plant. Hot flue gas is used instead of hot air as the heat source of the pyrolysis furnace, and the urea solution transported to the urea pyrolysis furnace is vaporized and decomposed to prepare ammonia, solving the problem that the power consumption of the electric heater is relatively large due to the low temperature of the hot air from the coal-fired gas boiler, and the urea pyrolysis has high power consumption and high operating cost.
[0004] However, the above-mentioned urea pyrolysis device for gas boiler still has the following defects:
[0005] The above-mentioned urea pyrolysis device for a gas-fired boiler uses hot flue gas instead of hot air as the heat source of the pyrolysis furnace to vaporize and decompose the urea solution transported to the urea pyrolysis furnace to prepare ammonia, thereby solving the problem that due to the low temperature of the hot air from the gas-fired boiler, an electric heater with relatively large power consumption is required, resulting in high power consumption and high operating costs for urea pyrolysis. However, when the device is performing a pyrolysis reaction, the reaction area of the hot flue gas in contact with the urea solution is small, and a sufficient pyrolysis reaction cannot be carried out, and the uniformity of the pyrolysis will also be reduced. Therefore, we need a new urea solution pyrolysis device to solve the above problems. Utility Model Content
[0006] The utility model aims to provide a novel urea solution pyrolysis device, which mainly introduces heat into the interior of a heating chamber through a heating component, and supplements the heat lost in the process of flue gas diversion, so that the flue gas can have enough heat to enter the interior of a pyrolysis reaction chamber to fully pyrolyze the urea solution, and through the guide plate, the incoming flue gas can be effectively divided into a plurality of small airflows, which are evenly released into the interior of the pyrolysis reaction chamber, and under the action of a liquid spraying disk, the spraying area of the urea solution can be greatly increased, so that the pyrolysis reaction of the urea solution and the high-temperature flue gas is more sufficient.
[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a novel urea solution pyrolysis device, comprising a urea dissolving tank and a urea pyrolysis furnace, wherein a stirring assembly is arranged inside the urea dissolving tank, a urea solution tank is arranged on one side of the urea dissolving tank, a second water pumping pipe is arranged above the urea solution tank, one end of the second water pumping pipe is arranged above the urea pyrolysis furnace, a guide plate is installed on the top of the urea pyrolysis furnace, a heating chamber is installed above the guide plate, a heating assembly is installed on one side of the heating chamber, a liquid spraying disk is arranged inside the cavity of the urea pyrolysis furnace, a pyrolysis reaction chamber is arranged below the liquid spraying disk, and an outlet pipe is arranged at the bottom end of the urea pyrolysis furnace.
[0008] Preferably, the stirring assembly includes a driving motor and a stirring shaft, the driving motor is fixedly mounted on the top of the urea dissolution tank, the output shaft of the driving motor is fixedly connected to one end of the stirring shaft, the other end of the stirring shaft is provided with a fixing seat via a bearing, the fixing seat is fixedly mounted on the inner bottom of the urea dissolution tank, a plurality of stirring rods are embedded around the stirring shaft, and one end of the plurality of stirring rods is fixedly connected to the outer wall of the stirring shaft.
[0009] Preferably, a feeding port is provided at one side of the top of the urea dissolution tank, a discharge port is provided at one side of the bottom of the urea dissolution tank, and a first water pumping pipe is sleeved at one side of the discharge port.
[0010] Preferably, one end of the first water pumping pipe is connected to one side of the urea solution tank, a first water pump is provided on the first water pumping pipe, and a water outlet of the first water pump is connected to the first water pump near the side of the urea solution tank.
[0011] Preferably, a circulation pipe is connected through the other side of the urea solution tank, a circulation pump is provided on the circulation pipe, and one end of the circulation pipe is communicated with the top end of the urea solution tank.
[0012] Preferably, the top end of the heating chamber is connected through one end of a second water pumping pipe, the other end of the second water pumping pipe is connected to a circulation pipeline, and a second water pumping pump is provided on the second water pumping pipe.
[0013] Preferably, an electric heater is installed inside the heating component, one side of the heating component is connected to a gas pipe, an air pump is installed on the gas pipe, one end of the gas pipe is connected to one side of the heating chamber, and a sealing gasket is installed at the connection between the urea pyrolysis furnace and the outlet pipe.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] 1. The utility model mainly introduces heat into the interior of the heating chamber through the heating component, and supplements the heat lost in the process of flue gas diversion, so that the flue gas can have enough heat to enter the interior of the pyrolysis reaction chamber and fully pyrolyze the urea solution. Moreover, through the guide plate, the incoming flue gas can be effectively divided into multiple small airflows, which are evenly released into the interior of the pyrolysis reaction chamber, and under the action of the spray plate, the spraying area of the urea solution can be greatly increased, so that the pyrolysis reaction of the urea solution and the high-temperature flue gas is more sufficient. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;
[0017] Figure 2 It is a cross-sectional view of the urea dissolving tank of the utility model;
[0018] Figure 3 It is a cross-sectional view of the urea pyrolysis furnace of the utility model;
[0019] Figure 4 It is a cross-sectional view of the heating component of the present utility model.
[0020] In the figure: 1. urea dissolving tank; 101. feeding port; 102. driving motor; 103. stirring shaft; 104. stirring rod; 105. fixing seat; 106. discharging port; 2. first water pump; 201. first water pumping pipe; 3. urea solution tank; 4. circulating pump; 401. circulating pipeline; 5. second water pump; 502. second water pumping pipe; 6. heating component; 601. electric heater; 7. air pump; 701. air pipe; 8. heating chamber; 9. guide plate; 10. urea pyrolysis furnace; 11. sealing pad; 12. outlet pipe; 13. liquid spraying plate; 14. pyrolysis reaction chamber. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] See also Figure 1-4 The utility model provides a technical solution: a novel urea solution pyrolysis device, comprising a urea dissolving tank 1 and a urea pyrolysis furnace 10, wherein a stirring assembly is arranged inside the urea dissolving tank 1, a urea solution tank 3 is arranged on one side of the urea dissolving tank 1, a second water pumping pipe 502 is arranged above the urea solution tank 3, one end of the second water pumping pipe 502 is arranged above the urea pyrolysis furnace 10, a guide plate 9 is installed on the top of the urea pyrolysis furnace 10, a heating chamber 8 is installed above the guide plate 9, a heating assembly 6 is installed on one side of the heating chamber 8, a liquid spraying plate 13 is arranged inside the cavity of the urea pyrolysis furnace 10, a pyrolysis reaction chamber 14 is arranged below the liquid spraying plate 13, and an outlet pipe 12 is arranged at the bottom end of the urea pyrolysis furnace 10;
[0023] When in use, heat is introduced into the interior of the heating chamber 8 through the heating component 6 to supplement the heat lost during the flue gas diversion process, so that the flue gas can have enough heat to enter the interior of the pyrolysis reaction chamber 14 and fully pyrolyze the urea solution. Moreover, through the guide plate 9, the incoming flue gas can be effectively divided into multiple small airflows and evenly released into the interior of the pyrolysis reaction chamber 14. Under the action of the spray disk 13, the spraying area of the urea solution can be greatly increased, so that the pyrolysis reaction of the urea solution and the high-temperature flue gas is more sufficient.
[0024] The stirring assembly includes a driving motor 102 and a stirring shaft 103. The driving motor 102 is fixedly installed at the top of the urea dissolution tank 1. The output shaft of the driving motor 102 is fixedly connected to one end of the stirring shaft 103. The other end of the stirring shaft 103 is installed with a fixing seat 105 through a bearing. The fixing seat 105 is fixedly installed on the inner bottom of the urea dissolution tank 1. A plurality of stirring rods 104 are embedded around the stirring shaft 103. One end of the plurality of stirring rods 104 is fixedly connected to the outer wall of the stirring shaft 103. The urea solution in the urea dissolution tank 1 can be fully and evenly stirred by the stirring assembly. The other end of the stirring shaft 103 is installed with a fixing seat 105 through a bearing, so that the stirring shaft 103 can rotate freely in the urea dissolution tank 1, thereby avoiding uneven stirring or damage to the stirring shaft 103 due to excessive resistance.
[0025] A loading port 101 is provided on one side of the top of the urea dissolving tank 1, a discharging port 106 is provided on one side of the bottom of the urea dissolving tank 1, and a first water pumping pipe 201 is sleeved on one side of the discharging port 106. Through the introduction of the first water pumping pipe 201, the urea solution can be extracted more timely and evenly, avoiding the problem of excessively high or low local concentration caused by uneven distribution of the solution.
[0026] One end of the first water pumping pipe 201 is connected to one side of the urea solution tank 3, and a first water pump 2 is arranged on the first water pumping pipe 201. The water outlet of the first water pump 2 is connected to the first water pump 2 near the side of the urea solution tank 3. The urea solution can be effectively pumped out of the urea solution tank 3 through the first water pump 2, thereby improving the working efficiency.
[0027] A circulation pipe 401 is connected through the other side of the urea solution tank 3. A circulation pump 4 is provided on the circulation pipe 401. One end of the circulation pipe 401 is connected to the top of the urea solution tank 3. Through the cooperation of the circulation pump 4 and the circulation pipe 401, the urea solution can be effectively circulated between the urea solution tank 3 and the circulation pipe 401, thereby increasing the contact area and dissolution time of urea and water and accelerating the dissolution process of urea.
[0028] The top of the heating chamber 8 is connected with one end of the second water pumping pipe 502, and the other end of the second water pumping pipe 502 is connected with the circulation pipe 401. The second water pumping pipe 502 is provided with a second water pump 5. The urea solution in the urea solution tank 3 can be pumped into the heating chamber 8 for heating through the second water pump 5, so as to pave the way for the urea solution to enter the pyrolysis reaction chamber 14 in advance.
[0029] An electric heater 601 is installed inside the heating component 6, one side of the heating component 6 is connected to an air pipe 701, an air pump 7 is installed on the air pipe 701, one end of the air pipe 701 is connected to one side of the heating chamber 8, and a sealing gasket 11 is installed at the connection between the urea pyrolysis furnace 10 and the outlet pipe 12. Through the extraction action of the air pump 7, the heated air and urea solution can smoothly enter the urea pyrolysis furnace 10, ensuring the smooth progress of the urea pyrolysis process. The sealing gasket 11 can ensure the sealing of the connection, avoid the leakage of the heated air and urea solution, and improve the safety of production.
[0030] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A novel urea solution pyrolysis device, comprising a urea dissolving tank (1) and a urea pyrolysis furnace (10), characterized in that: A stirring assembly is arranged inside the urea dissolution tank (1); a urea solution tank (3) is arranged on one side of the urea dissolution tank (1); a second water pumping pipe (502) is arranged above the urea solution tank (3); one end of the second water pumping pipe (502) is arranged above the urea pyrolysis furnace (10); a guide plate (9) is installed on the top of the urea pyrolysis furnace (10); a heating chamber (8) is installed above the guide plate (9); a heating assembly (6) is installed on one side of the heating chamber (8); a liquid spraying plate (13) is arranged inside the cavity of the urea pyrolysis furnace (10); a pyrolysis reaction chamber (14) is arranged below the liquid spraying plate (13); and an outlet pipe (12) is arranged at the bottom end of the urea pyrolysis furnace (10).
2. A novel urea solution pyrolysis device according to claim 1, characterized in that: The stirring assembly comprises a driving motor (102) and a stirring shaft (103); the driving motor (102) is fixedly mounted on the top of a urea dissolving tank (1); the output shaft of the driving motor (102) is fixedly connected to one end of the stirring shaft (103); the other end of the stirring shaft (103) is mounted with a fixing seat (105) via a bearing; the fixing seat (105) is fixedly mounted on the inner bottom of the urea dissolving tank (1); a plurality of stirring rods (104) are embedded around the stirring shaft (103); one end of the plurality of stirring rods (104) is fixedly connected to the outer wall of the stirring shaft (103).
3. A novel urea solution pyrolysis device according to claim 2, characterized in that: A feeding port (101) is provided at one side of the top of the urea dissolving tank (1), a discharge port (106) is provided at one side of the bottom of the urea dissolving tank (1), and a first water pumping pipe (201) is sleeved on one side of the discharge port (106).
4. A novel urea solution pyrolysis device according to claim 3, characterized in that: One end of the first water pumping pipe (201) is connected to one side of the urea solution tank (3); a first water pump (2) is provided on the first water pumping pipe (201); and a water outlet of the first water pump (2) is connected to the first water pump (2) near the side of the urea solution tank (3).
5. A novel urea solution pyrolysis device according to claim 4, characterized in that: A circulation pipe (401) is connected through the other side of the urea solution tank (3), a circulation pump (4) is provided on the circulation pipe (401), and one end of the circulation pipe (401) is in communication with the top end of the urea solution tank (3).
6. A novel urea solution pyrolysis device according to claim 5, characterized in that: The top end of the heating chamber (8) is connected to one end of a second water pumping pipe (502), the other end of the second water pumping pipe (502) is connected to a circulation pipe (401), and a second water pump (5) is provided on the second water pumping pipe (502).
7. A novel urea solution pyrolysis device according to claim 6, characterized in that: An electric heater (601) is installed inside the heating component (6); one side of the heating component (6) is connected to a gas supply pipe (701); an air pump (7) is installed on the gas supply pipe (701); one end of the gas supply pipe (701) is connected to one side of the heating chamber (8); and a sealing gasket (11) is installed at the connection between the urea pyrolysis furnace (10) and the outlet pipe (12).