Flue gas denitration device of waste heat boiler

Abstract

The utility model relates to a waste heat boiler flue gas denitration device which comprises a waste heat boiler main body, a flue gas pipeline, a denitration agent spraying and supplying mechanism arranged in the flue gas pipeline, a mixer and a pump body, the flue gas pipeline is communicated with a smoke outlet in the waste heat boiler main body, and the mixer is communicated with the pump body through a pipeline. The system further comprises a temperature conducting frame, and the temperature conducting frame is connected with the cooling mechanism and arranged at the end, away from the denitration agent spraying and supplying mechanism, of the flue gas pipeline. The temperature guide plate and the temperature guide baffle can recycle water vapor evaporated in the denitration process, water molecules in flue gas are condensed, the situation that the water molecules are discharged to the outside along with nitrogen can be reduced, then the water molecule recycling effect is improved, meanwhile, water is conveyed into the mixer to be mixed with a denitration agent solid raw material, and the denitration effect is improved. The utilization rate of water can be increased, and waste of water resources is reduced.

Description

[Technical field]

[0001] The utility model relates to the technical field of waste heat boiler flue gas denitration equipment, in particular to a waste heat boiler flue gas denitration device. [Background technology]

[0002] Waste heat boiler refers to a boiler that uses waste heat from the industrial production process to produce steam. It is a high-temperature, high-pressure heat exchanger. Waste heat boilers were used to produce some low-pressure steam earlier, and the recovered heat was limited. It was only used as a general auxiliary equipment for production. With the development of production technology, the parameters of waste heat boilers have gradually improved. Waste heat boilers have been transformed from process boilers that produce low-pressure steam to power boilers that produce high-pressure steam. New achievements in waste heat research continue to emerge in the fields of waste heat boiler design, manufacturing, use, and safety management. During the operation of the boiler, more flue gas will be generated, and there will be NOX (nitrogen oxides) inside the flue gas. In order to reduce NOX to N2 and remove NOX in the flue gas, a denitrification device is generally used. The existing denitrification devices are as follows:

[0003] For example, the patent publication number CN205700135U discloses: a flue gas denitrification tower includes an activated carbon silo, a shell, an ammonia injection main pipe, a denitrification chamber, a gas collecting chamber, an air inlet chamber, an air inlet, a gas collecting pipe, an exhaust pipe, a tower bottom silo, and a bracket. The denitrification chamber is an annular cavity composed of a first cylinder and a second cylinder. The first cylinder is composed of a plurality of inverted truncated hollow cones, each of which is connected by an outer connecting rod. The second cylinder is composed of a plurality of truncated hollow cones, each of which is connected by an inner connecting rod. The inverted truncated hollow cones and the truncated hollow cones are vertically staggered, and have the advantages of high denitrification efficiency, low operating cost, and low investment.

[0004] As disclosed in patent publication number CN205760557U: a boiler flue gas denitrification tower, including a denitrification tower, characterized in that: the denitrification tower is provided with a wastewater pool, a first spray layer, a second spray layer, a third wet washing layer, and a demisting layer in sequence from bottom to top, swirl plates are installed in the first spray layer and the second spray layer, a wet washing device is installed in the third wet washing layer, the first spray layer is connected to the first medicine barrel, the second spray layer is connected to the second medicine barrel, the third wet washing layer is connected to the third medicine barrel, and the spray layer is connected to the fourth medicine barrel. It has a simple and reasonable structure, is mainly used for denitrification of boiler flue gas, has low labor cost and high processing efficiency, and can safely and reliably process nitrogen oxide flue gas generated by combustion of power plant boilers. The high-efficiency NOX denitrification tower adopted in the device has the main characteristics of small pressure loss, high processing efficiency, low operating cost, and safe and stable operation.

[0005] Among the above-mentioned existing technologies, denitrification of flue gas is mainly achieved through chemical reaction between flue gas and denitrification agent. However, when the denitrification agent is sprayed for denitrification, the moisture in the denitrification agent is generally evaporated at high temperature to generate water vapor. During the denitrification process, water molecules are also generated in the flue gas. The water molecules are mixed with nitrogen and discharged to the outside with the nitrogen, thereby achieving a reaction to the flue gas. Although this method can achieve the reaction of the flue gas, during the discharge of nitrogen, the water molecules in the nitrogen are discharged to the outside together with the nitrogen, thereby causing the loss of water molecules, and then leading to a waste of water resources. [Contents of the utility model]

[0006] The purpose of the utility model is to solve the problems in the prior art and to provide a waste heat boiler flue gas denitration device, which can recycle the water vapor evaporated during the denitration process.

[0007] In order to achieve the above-mentioned purpose, the utility model proposes a waste heat boiler flue gas denitration device, comprising: a waste heat boiler body, a flue gas duct, a denitrification agent injection and supply mechanism arranged in the flue gas duct, a mixer and a pump body, wherein the flue gas duct is communicated with the exhaust port in the waste heat boiler body, the mixer is communicated with the pump body through a pipeline, and the pump body is communicated with the denitrification agent injection and supply mechanism through a pipeline, and further comprising:

[0008] A temperature conducting frame, wherein the temperature conducting frame is connected to a cooling mechanism and is arranged at one end of the flue gas duct away from the denitrification agent injection and supply mechanism, and the cooling mechanism is arranged in the flue gas duct, and the cooling mechanism can cool the temperature conducting frame;

[0009] A heat conduction plate, wherein the heat conduction plates are provided in a plurality of pieces and are all fixedly connected in the heat conduction frame, and a honeycomb-shaped chamber is formed between the heat conduction plates for smoke to flow;

[0010] A plurality of heat-conducting baffles are provided, and all are fixedly connected in the heat-conducting frame, two adjacent heat-conducting baffles are arranged in a staggered manner, and a flow slot for smoke flow is left between the two adjacent heat-conducting baffles;

[0011] A collecting box with a slot on the top is fixedly connected in the smoke duct, and the slot is located below the heat conduction plate. The collecting box is connected to the mixer through a conveying pipe.

[0012] Preferably, the cooling mechanism includes a temperature conducting box with a built-in cavity, a liquid pump and a cooler, the temperature conducting box is fixedly connected in the flue gas duct, one end of the temperature conducting box is fixedly connected to the temperature conducting frame, and the side wall of the temperature conducting frame is in communication with the cavity, the liquid pump is fixedly connected to the temperature conducting box, the cooler is fixedly connected to the temperature conducting box, the cooler is in communication with the liquid pump through a pipe, and the cooler is in communication with the cavity through a pipe.

[0013] Preferably, a transmission impeller is rotatably connected in the cavity, a waterproof motor is fixedly connected in the cavity, and an output shaft of the waterproof motor is fixedly connected to the transmission impeller.

[0014] Preferably, one end of the flue gas duct away from the temperature conduction frame and the denitrification agent injection and supply mechanism is penetrated and fixedly connected with a guide fan 1, and the guide fan 1 is penetrated and fixedly connected with a circulation pipe, and one end of the circulation pipe away from the guide fan 1 is communicated with one end of the flue gas duct away from the guide fan 1 and the temperature conduction frame.

[0015] Preferably, the flue gas duct is provided with a second guide fan located between the first guide fan and the temperature conduction frame.

[0016] Preferably, the thermal conduction baffle is arranged at an angle, and one end of the thermal conduction baffle away from the thermal conduction frame is inclined toward the slot.

[0017] Preferably, temperature conducting rods are staggeredly arranged in the temperature conducting frame, and the temperature conducting rods penetrate the temperature conducting frame and extend into the cavity.

[0018] Preferably, a second liquid pump is fixedly connected in the collecting box, the second liquid pump is communicated with the delivery pipe, a liquid level sensor is fixedly connected in the collecting box, a control panel is provided on one side of the flue gas duct, the control panel is electrically connected to the liquid level sensor, and the second liquid pump is electrically connected to the control panel.

[0019] The beneficial effects of the present invention are as follows: compared with the prior art, the flue gas in the present invention will enter the temperature conducting frame through the guide of the flue gas duct, and the temperature conducting frame, the temperature conducting plate and the temperature conducting plate are cooled by a cooling mechanism, so that the water molecules in the flue gas are condensed into water and fall into the slots, and the water is transported by the delivery pipe back to the mixer to be mixed with the solid raw materials of the denitrification agent, thereby realizing the recycling of water. By condensing the water molecules in the flue gas, the discharge of water molecules to the outside with nitrogen can be reduced, thereby increasing the recovery effect of water molecules. At the same time, the water is transported to the mixer to be mixed with the solid raw materials of the denitrification agent, which can increase the utilization rate of water and reduce the waste of water resources.

[0020] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 It is a schematic diagram of the position of the heat conduction plate of the utility model;

[0023] Figure 3 It is a schematic diagram of the position of the liquid level sensor of the utility model.

[0024] In the figure: 1. Waste heat boiler body; 2. Flue gas duct; 3. Denitrification agent injection and supply mechanism; 4. Mixer; 5. Pump body; 6. Temperature conduction frame; 7. Cooling mechanism; 8. Temperature conduction plate; 9. Temperature conduction baffle; 10. Flow slot; 11. Collecting box; 12. Slot; 13. Temperature conduction box; 14. Liquid extraction pump 1; 15. Cooler; 16. Transmission impeller; 17. Waterproof motor; 18. Diversion fan 1; 19. Circulation pipe; 20. Diversion fan 2; 21. Temperature conduction rod; 22. Liquid extraction pump 2; 23. Liquid level sensor; 24. Control panel; 25. Support plate; 26. Nozzle 1; 27. Mixing box; 28. Stirring rod; 29. ​​Motor 3. [Specific implementation method]

[0025] 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 in conjunction with 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 used to limit the present invention.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0027] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] Please refer to Figures 1 to 3, is a waste heat boiler flue gas denitration device of the utility model, comprising: a waste heat boiler body 1, a flue gas duct 2, a denitrification agent injection supply mechanism 3 arranged in the flue gas duct 2, a mixer 4 and a pump body 5, the flue gas duct 2 is communicated with the exhaust port in the waste heat boiler body 1, the mixer 4 is communicated with the pump body 5 through a pipeline, and the pump body 5 is communicated with the denitrification agent injection supply mechanism 3 through a pipeline, wherein the denitrification agent injection supply mechanism 3 is mainly composed of a support plate 25 and a nozzle 26 connected, the support plate 25 is fixedly connected in the flue gas duct 2, and the nozzle 26 is fixedly connected to the support plate 25. The support plate 25 is connected to the pump body 5 through a pipeline. The nozzle 26 is mainly used to spray the denitrification agent, and the mixer 4 is mainly composed of a mixing box 27 and a stirring rod 28. The stirring rod 28 is driven to rotate and is connected in the mixing box 27. The driving method is driven by a motor 3 29. The motor 3 29 is fixedly connected in the mixing box 27, and its output shaft is fixedly connected to the stirring rod 28. A water inlet pipe is fixedly connected to the mixer 4, and a solenoid valve is fixedly connected to the water inlet pipe for water to enter. It is worth mentioning that the flue gas pipe can be a square tube, a round tube or a square tube.

[0030] The denitration device further includes: a temperature conducting frame 6, a temperature conducting plate 8, a temperature conducting baffle 9 and a collecting box 11;

[0031] The temperature conducting frame 6 is connected with the cooling mechanism 7 and is arranged at one end of the flue gas duct 2 away from the denitrification agent injection supply mechanism 3. The cooling mechanism 7 is arranged in the flue gas duct 2, and the cooling mechanism 7 can cool the temperature conducting frame 6. The cooling mechanism 7 is mainly used to cool the temperature conducting frame 6. The temperature conducting plate 8 is provided with a plurality of pieces, and they are all fixedly connected in the temperature conducting frame 6. A honeycomb chamber is formed between the temperature conducting plates 8 for flue gas circulation. After the temperature conducting frame 6 is cooled, the temperature conducting frame 6 The temperature is conducted to the heat conducting plate 8 for heat conduction, thereby realizing the cooling of the heat conducting plate 8, and the flue gas enters the heat conducting plate 8 in the heat conducting frame 6, and the heat conducting plate 8 and the heat conducting frame 6 are used to cool the water molecules in the flue gas. After cooling, the water molecules condense into water and enter the water, and fall under the automatic gravity, while the flue gas passes through the heat conducting plate 8 and is discharged to the outside through the flue gas pipe 2, thereby realizing the condensation of water molecules. Since the heat conducting baffle 9 is provided with several pieces, and they are all fixedly connected in the heat conducting frame 6 The two adjacent heat-conducting baffles 9 are staggered, and a flow slot 10 for flue gas flow is left between the two adjacent heat-conducting baffles 9. The heat-conducting baffles 9 are in contact with the flue gas to increase the cooling surface of the flue gas and the heat-conducting baffles 9, so that the cooling effect of water molecules in the flue gas is increased. The collecting box 11 is fixedly connected to the flue gas duct 2, and the slot 12 is located below the heat-conducting baffles 8. The collecting box 11 is connected to the mixer 4 through a conveying pipe. The molecules enter the collecting box 11 after being subjected to gravity. The collecting box The water in 11 will enter into the mixing box 27 connected with the delivery pipe through the delivery pipe to realize the recycling of water. A feeding pipe for the solid raw material of denitrification agent (urea) is arranged on the top of the mixing box 27. The stirring rod 28 is driven by the motor 29 to mix the water with the solid raw material of denitrification agent to form the denitrification agent. It is worth mentioning that the mixing box 27 is connected with the pump body 5 through a pipeline. At the same time, the material of the temperature conduction frame 6, the temperature conduction plate 8 and the temperature conduction baffle 9 is copper, which has a good temperature conduction effect.

[0032] Specifically, the cooling mechanism 7 includes a temperature conducting box 13 with a built-in cavity, a liquid pump 14 and a cooler 15. The temperature conducting box 13 is fixedly connected to the flue gas duct 2, one end of the temperature conducting box 13 is fixedly connected to the temperature conducting frame 6, and the side wall of the temperature conducting frame 6 is communicated with the cavity, the liquid pump 14 is fixedly connected to the temperature conducting box 13, the cooler 15 is fixedly connected to the temperature conducting box 13, the cooler 15 is communicated with the liquid pump 14 through a pipeline, the cooler 15 is communicated with the cavity through a pipeline, and the liquid pump 1 mainly transfers the coolant in the temperature conducting box 13 to the cooler 15 for cooling, and uses the cooler 15 to communicate with the temperature conducting box 13, so as to cool the coolant, and also conduct the cooling to the temperature conducting frame 6, and condense the water molecules in the flue gas by means of temperature conduction, thereby realizing the condensation of water molecules in the flue gas.

[0033] Specifically, the transmission impeller 16 is rotatably connected in the cavity, and the output shaft of the waterproof motor 17 fixedly connected in the cavity is fixedly connected to the transmission impeller 16 , so that the coolant can be transmitted in the temperature conduction box 13 .

[0034] Specifically, one end of the flue gas duct 2 away from the temperature conducting frame 6 and the denitrification agent injection and supply mechanism 3 is penetrated and fixedly connected with a guide fan 18, and the guide fan 18 is penetrated and fixedly connected with a circulation pipe 19. One end of the circulation pipe 19 away from the guide fan 18 is communicated with one end of the flue gas duct 2 away from the guide fan 18 and the temperature conducting frame 6. During the startup process, the guide fan 18 can return part of the flue gas through the circulation pipe 19 to the flue gas duct for secondary condensation, thereby increasing the condensation effect of water molecules in the flue gas.

[0035] Specifically, the flue gas duct 2 is provided with a guide fan 20 between the guide fan 1 18 and the temperature conducting frame 6 , and the guide fan 2 20 is mainly used for guiding the flue gas.

[0036] Specifically, the thermal baffle 9 is tilted, and one end of the thermal baffle 9 away from the thermal frame 6 tilts toward the slot 12 . The tilted thermal baffle 9 can guide water to prevent it from being retained on the thermal baffle 9 .

[0037] Specifically, the temperature conducting rods 21 are staggered in the temperature conducting frame 6, and the temperature conducting rods 21 penetrate the temperature conducting frame 6 and extend into the cavity. The temperature conducting rods 21 are mainly used for conducting temperature, and conduct the temperature to the middle temperature conducting plate 8, thereby increasing the temperature conduction effect. The material of the temperature conducting rods 21 is copper.

[0038] Specifically, a second liquid pump 22 is fixedly connected in the collecting box 11, and the second liquid pump 22 is communicated with the delivery pipe. A liquid level sensor 23 is fixedly connected in the collecting box 11. A control panel 24 is arranged on one side of the flue gas duct 2. The control panel 24 is electrically connected to the liquid level sensor 23. The second liquid pump 22 is electrically connected to the control panel 24. The liquid level in the collecting box 11 can be sensed by the liquid level sensor 23. When the liquid level rises to a certain temperature, a signal is transmitted to the control panel 24. The control panel 24 controls the second liquid pump 22 to start, thereby realizing the transmission of water to the mixing box 27 through the delivery pipe, thereby realizing the recycling of water.

[0039] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. Waste heat boiler flue gas denitrification device, including: A waste heat boiler body (1), a flue gas duct (2), a denitrification agent injection supply mechanism (3) arranged in the flue gas duct (2), a mixer (4) and a pump body (5), wherein the flue gas duct (2) is connected to a smoke exhaust port in the waste heat boiler body (1), the mixer (4) is connected to the pump body (5) through a pipeline, and the pump body (5) is connected to the denitrification agent injection supply mechanism (3) through a pipeline, and is characterized in that it also includes: A temperature conducting frame (6), the temperature conducting frame (6) being connected to a cooling mechanism (7) and arranged at an end of the flue gas duct (2) away from the denitrification agent injection and supply mechanism (3), the cooling mechanism (7) being arranged in the flue gas duct (2), and the cooling mechanism (7) being capable of cooling the temperature conducting frame (6); A heat conduction plate (8), wherein the heat conduction plates (8) are provided in a plurality of pieces and are all fixedly connected in the heat conduction frame (6), and a honeycomb-shaped chamber is formed between the heat conduction plates (8) for smoke to circulate; A heat conduction baffle (9), wherein a plurality of heat conduction baffles (9) are provided and are all fixedly connected in the heat conduction frame (6), two adjacent heat conduction baffles (9) are arranged in a staggered manner, and a flow groove (10) for smoke flow is left between the two adjacent heat conduction baffles (9); A collecting box (11) with a groove (12) on the top, the collecting box (11) is fixedly connected in the flue gas duct (2), and the groove (12) is located below the heat conducting plate (8), and the collecting box (11) is connected to the mixer (4) through a conveying pipe.

2. The waste heat boiler flue gas denitrification device according to claim 1, characterized in that: The cooling mechanism (7) comprises a temperature conducting box (13) with a built-in cavity, a liquid extraction pump (14) and a cooler (15); the temperature conducting box (13) is fixedly connected to the flue gas duct (2); one end of the temperature conducting box (13) is fixedly connected to a temperature conducting frame (6), and a side wall of the temperature conducting frame (6) is in communication with the cavity; the liquid extraction pump (14) is fixedly connected to the temperature conducting box (13); the cooler (15) is fixedly connected to the temperature conducting box (13); the cooler (15) is in communication with the liquid extraction pump (14) through a pipeline; and the cooler (15) is in communication with the cavity through a pipeline.

3. The waste heat boiler flue gas denitrification device according to claim 2 is characterized in that: A transmission impeller (16) is rotatably connected in the cavity, a waterproof motor (17) is fixedly connected in the cavity, and an output shaft of the waterproof motor (17) is fixedly connected to the transmission impeller (16).

4. The waste heat boiler flue gas denitrification device according to claim 1, characterized in that: One end of the flue gas duct (2) away from the temperature conducting frame (6) and the denitrification agent injection supply mechanism (3) is penetrated and fixedly connected with a guide fan (18), and the guide fan (18) is penetrated and fixedly connected with a circulation pipe (19), and one end of the circulation pipe (19) away from the guide fan (18) is communicated with one end of the flue gas duct (2) away from the guide fan (18) and the temperature conducting frame (6).

5. The waste heat boiler flue gas denitration device according to claim 3 is characterized in that: The flue gas duct (2) is provided with a second flow guide fan (20) located between the first flow guide fan (18) and the temperature conduction frame (6).

6. The waste heat boiler flue gas denitrification device according to claim 1, characterized in that: The heat conduction baffle (9) is arranged in an inclined manner, and one end of the heat conduction baffle (9) away from the heat conduction frame (6) is inclined towards the slot (12).

7. The waste heat boiler flue gas denitrification device according to claim 3 is characterized in that: The temperature conducting rods (21) are arranged in a staggered manner in the temperature conducting frame (6), and the temperature conducting rods (21) penetrate the temperature conducting frame (6) and extend into the cavity.

8. The waste heat boiler flue gas denitration device according to claim 1, characterized in that: A second liquid pump (22) is fixedly connected to the collecting box (11), and the second liquid pump (22) is communicated with the delivery pipe. A liquid level sensor (23) is fixedly connected to the collecting box (11). A control panel (24) is provided on one side of the flue gas duct (2), and the control panel (24) is electrically connected to the liquid level sensor (23). The second liquid pump (22) is electrically connected to the control panel (24).

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