A liquid ammonia evaporator for flue gas denitrification

Abstract

The present invention belongs to the technical field of evaporators, and specifically is a liquid ammonia evaporator for flue gas denitrification; it comprises a base, a tank body is provided on the surface of the base, a liquid inlet pipe is provided on the top of the tank body, a liquid outlet pipe is provided on the bottom of the tank body, a gas-liquid separator is provided inside the tank body, a gas outlet pipe is provided on the top of the gas-liquid separator, a liquid outlet pipe is provided on the bottom of the ammonia-liquid separator, a heating tube disc is provided on the outer surface of the ammonia-liquid separator, and further comprises: a heating chamber: one side of the heating chamber is connected to the tank body, a flue gas pipe is provided on the outer surface of the heating chamber, and a heat medium is heated and transmitted inside the heating chamber; a reaction chamber: the reaction chamber is located at the top of the tank body and is used for flue gas denitrification; a circulation mechanism: the circulation mechanism is located inside the tank body, and the present invention circulates and outputs the heat medium inside the heating chamber to the inside of the tank body through the circulation mechanism, thereby achieving the purpose of recycling the heat medium inside the tank body, promoting the temperature uniformity inside the tank, improving the evaporation efficiency and saving energy and reducing emissions.

Description

Technical Field

[0001] The invention belongs to the technical field of evaporators, in particular to a liquid ammonia evaporator for flue gas denitrification. Background Art

[0002] With the development of modern industrial production and the improvement of living standards, air pollution has become a matter of great concern to people. A major issue in air pollution is nitrogen oxides: nitrogen oxides cause photochemical reactions under the action of sunlight, forming photochemical smog, which causes serious air pollution. The flue gas from thermal power plants contains large amounts of nitrogen oxides. If left untreated, these exhaust gases will be discharged into the atmosphere, causing pollution and acid rain. To further reduce nitrogen oxide emissions, the flue gas after combustion must be denitrated. The principle of flue gas denitrification is to transport flue gas and ammonia into a denitrification tower. Under the catalytic action of the catalyst, the nitrogen oxides in the flue gas are reduced to nitrogen and water, thus achieving the removal of nitrogen oxides from the flue gas. Ammonia is mainly evaporated through a liquid ammonia evaporator.

[0003] Existing liquid ammonia evaporators use a water bath method, where steam passes through a steam evaporation coil to heat water outside the coil, creating a water bath at a constant temperature. This requires external steam for heating, increasing denitration costs. Furthermore, significant stratification of water temperature during the denitration process results in low evaporation efficiency for the liquid ammonia, often failing to meet the desired vapor volume.

[0004] In view of this, in order to overcome the above technical problems, the present invention designs a liquid ammonia evaporator for flue gas denitrification, which solves the above technical problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is as follows: In the prior art, steam is used to heat water outside the steam evaporation coil to provide a water bath at a certain temperature. This not only requires external water steam for heating, which increases the cost of denitrification, but also causes obvious stratification of water temperature during the denitrification process, resulting in low evaporation efficiency of liquid ammonia, and the amount of evaporated gas often does not meet the requirements.

[0006] The present invention provides a liquid ammonia evaporator for flue gas denitrification, comprising a base, a tank body provided on the surface of the base, a liquid inlet pipe provided on the top of the tank body, a liquid outlet pipe provided on the bottom of the tank body, an ammonia-liquid separator provided inside the tank body, an air outlet pipe provided on the top of the ammonia-liquid separator, a liquid outlet pipe provided on the bottom of the ammonia-liquid separator, a heating tube disc provided on the outer surface of the ammonia-liquid separator, and further comprising:

[0007] Heating chamber: A liquid exchange pipe is provided on one side of the heating chamber, the liquid exchange pipe is connected to the tank body, a flue gas pipe is provided on the outer surface of the heating chamber, a flue gas inlet pipe is provided at the bottom of the flue gas pipe, and the heating chamber is used to heat the heat medium;

[0008] Reaction chamber: The reaction chamber is located at the top of the tank body and is used for flue gas denitrification;

[0009] Circulation mechanism: The circulation mechanism is located inside the tank body, and the circulation mechanism circulates the heat medium inside the heating chamber inside the tank body.

[0010] Preferably, the circulation mechanism includes:

[0011] Motor: The motor is located on the top of the tank and is fixedly connected to the outer surface of the tank;

[0012] Bevel gear No. 1: The bevel gear No. 1 is connected to the output shaft of the motor;

[0013] No. 2 bevel gear: There are at least two No. 2 bevel gears, which mesh with the No. 1 bevel gear;

[0014] Rotating shaft: one end of the rotating shaft is connected to the second bevel gear, and the other end of the rotating shaft is connected to a disc;

[0015] Connecting rod No. 1: One end of the connecting rod No. 1 is connected to the disc, and the other end is connected to the connecting rod No. 2;

[0016] Slide plate: The slide plate is annular and is slidably connected to the inner wall of the tank body. One side of the slide plate is connected to the second connecting rod.

[0017] Preferably, a fixing plate is provided on the inner wall of the tank body close to the reaction chamber, and a through hole is provided in the middle of the fixing plate.

[0018] Preferably, a rotating plate is provided at one end of the output shaft of the motor.

[0019] Preferably, the heating chamber comprises:

[0020] Piston: The piston is located inside the heating chamber, and a traction line is connected to one side of the piston;

[0021] Spring: One side of the spring is fixedly connected to the inner wall of the heating chamber, and the other side of the spring is fixedly connected to the piston.

[0022] Preferably, the reaction chamber comprises:

[0023] Reaction plate: The reaction plate is located inside the reaction chamber, there is at least one reaction plate, and a smoke vent is provided at one end of the reaction plate;

[0024] Smoke outlet pipe: The smoke outlet pipe is located on one side of the reaction chamber and away from the smoke inlet pipe.

[0025] Air jet tube: An air jet tube is provided inside the reaction plate, and the number of the air jet tube is at least one.

[0026] Preferably, a spiral liquid channel is provided at the bottom of the ammonia-liquid separator.

[0027] Preferably, the traction wire is made of galvanized steel wire.

[0028] Preferably, the inner wall of the heating chamber is provided with a heat-insulating layer.

[0029] Preferably, the spring is made of heat-resistant steel.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. The present invention provides a liquid ammonia evaporator for flue gas denitrification. The present invention achieves the effect of recycling the heat medium inside the tank by setting a circulation mechanism to circulate and output the heat medium inside the heating chamber inside the tank.

[0032] 2. The present invention provides a liquid ammonia evaporator for flue gas denitrification. The present invention provides a rotating plate at one end of the output shaft of the motor to stir the heat medium in the tank, thereby promoting uniform heating of the liquid ammonia inside the heating tube and improving the evaporation efficiency of the liquid ammonia.

[0033] 3. The present invention provides a liquid ammonia evaporator for flue gas denitrification. By setting up a heating chamber, the present invention can recover the heat of the flue gas before it is discharged and use it as the required reaction heat, thereby greatly saving thermal energy.

[0034] 4. The present invention provides a liquid ammonia evaporator for flue gas denitrification. By setting up a reaction chamber, the present invention can immediately perform denitrification on the flue gas after the heat recovery is completed. That is, denitrification can be performed in real time during the production process, and there is no need for subsequent unified denitrification, which greatly saves manpower and material resources.

[0035] 5. The present invention provides a liquid ammonia evaporator for flue gas denitrification. By providing a spiral liquid channel at the bottom of the ammonia-liquid separator, the present invention promotes the recovery of unevaporated liquid ammonia, thereby improving the problem of excessive liquid accumulation at the bottom of the separator, which prevents the liquid ammonia from being completely discharged when the liquid ammonia evaporator stops working, leading to freezing and cracking of the evaporator tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below with reference to the accompanying drawings.

[0037] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0038] Figure 2 It is a structural schematic diagram of the circulation mechanism of the present invention;

[0039] Figure 3 Schematic diagram of the internal structure of the heating chamber of the present invention;

[0040] Figure 4It is a schematic diagram of the internal structure of the reaction chamber of the present invention.

[0041] In the figure: base 1, tank body 2, liquid inlet pipe 3, liquid outlet pipe 4, ammonia-liquid separator 5, air outlet pipe 6, heating tube disc 7, heating chamber 8, liquid exchange pipe 9, flue gas pipe 10, smoke inlet pipe 11, reaction chamber 12, circulation mechanism 13, motor 131, No. 1 bevel gear 132, No. 2 bevel gear 133, rotating shaft 134, disc 135, No. 1 connecting rod 136, No. 2 connecting rod 137, slide plate 138, fixed plate 14, rotating plate 15, piston 81, traction line 82, spring 83, reaction plate 121, smoke vent plate 122, injection pipe 123, smoke outlet pipe 124, insulation layer 16. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0043] The drawback of the liquid ammonia evaporator for flue gas denitrification in the prior art is that steam is directly sprayed into water for heating to evaporate the liquid ammonia into ammonia gas, requiring external water steam for heating, which greatly increases the cost of denitrification. At the same time, during the denitrification process, there is obvious stratification of water temperature, resulting in low evaporation efficiency of liquid ammonia.

[0044] In order to solve the above problems, the main concept adopted in this embodiment is: by setting a circulation mechanism 13 to circulate the heat medium inside the tank body 2 and output the heat medium inside the heating chamber 8, the heat medium inside the tank body 2 is circulated, so that the ammonia gas is always in a superheated state during the transportation process, which not only does not require the addition of steam, but also avoids the secondary condensation of ammonia.

[0045] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods;

[0046] The present invention provides a liquid ammonia evaporator for flue gas denitrification, comprising a base 1, a tank body 2 provided on the surface of the base 1, a liquid inlet pipe 3 provided on the top of the tank body 2, a liquid outlet pipe 4 provided on the bottom of the tank body 2, an ammonia-liquid separator 5 provided inside the tank body 2, an air outlet pipe 6 provided on the top of the ammonia-liquid separator 5, a liquid outlet pipe 4 provided on the bottom of the ammonia-liquid separator 5, a heating tube disc 7 provided on the outer surface of the ammonia-liquid separator 5, and further comprising:

[0047] Heating chamber 8: A liquid exchange pipe 9 is provided on one side of the heating chamber, and the liquid exchange pipe 9 is connected to the tank body 2. A flue gas pipe 10 is provided on the outer surface of the heating chamber 8, and a flue gas inlet pipe 11 is provided at the bottom of the flue gas pipe 10. The heating chamber 8 is used to heat the heat medium;

[0048] Reaction chamber 12: The reaction chamber 12 is located at the top of the tank body 2 and is used for flue gas denitrification;

[0049] Circulation mechanism 13 : The circulation mechanism 13 is located inside the tank body 2 , and the circulation mechanism 13 circulates the heat medium inside the heating chamber 8 inside the tank body 2 .

[0050] The present invention comprises a base 1, a tank body 2 is fixedly mounted on the surface of the base 1, the interior of the tank body 2 is filled with warm water, a liquid inlet pipe 3 is provided on the top of the tank body 2, an ammonia-liquid separator 5 is fixedly mounted inside the tank body 2, an air outlet pipe 6 is provided on the top of the ammonia-liquid separator 5, one end of the air outlet pipe 6 is connected to the reaction chamber 12 and a one-way valve is provided inside the air outlet pipe 6, a liquid outlet pipe 4 is provided at the bottom of the ammonia-liquid separator 5, a heating pipe disc 7 is fixedly connected to the outer surface of the ammonia-liquid separator 5, the heating pipe disc 7 is spiral, one end of the heating pipe disc 7 is connected to the liquid inlet pipe 3 The tank body 2 is connected to the upper and lower ends of the tank body 2, and the other end is connected to the ammonia-liquid separator 5. A heating chamber 8 is fixedly connected to one side of the tank body 2. The heating chamber 8 is annular. A liquid exchange pipe 9 is provided on one side of the heating chamber 8. There are two liquid exchange pipes 9. A flue gas pipe 10 passes through the middle of the heating chamber 8 and is fixedly connected to the heating chamber 8. A smoke inlet pipe 11 is provided at the bottom of the flue gas pipe 10. The inside of the heating chamber 8 is filled with heat medium, i.e., water. The other end of the flue gas pipe 10 is connected to a reaction chamber 12. The reaction chamber 12 is located at the top of the tank body 2, and the circulation mechanism 13 is located inside the tank body 2.

[0051] When the present invention is working, the flue gas is output from the flue gas inlet pipe 11 to the inside of the flue gas pipe 10 and finally to the inside of the reaction chamber 12. The heat of the flue gas heats the heat medium in the heating chamber 8. At the same time, the liquid ammonia enters the heating tube disc 7 from the liquid inlet pipe 3. At this time, the circulation mechanism 13 is started, so that the heat medium heated in the heating chamber 8 continuously enters the inside of the tank body 2 through the liquid exchange pipe 9, heating the warm water in the tank body 2, and vaporizing the liquid ammonia. The vaporized ammonia in the heating tube disc 7 is mixed with the liquid ammonia and enters the ammonia-liquid separator 5. The ammonia-liquid separator 5 is a prior art. Its principle is that the mixed ammonia gas and liquid ammonia enter the ammonia-liquid separator, and the unevaporated liquid ammonia drips to the bottom of the ammonia-liquid evaporator 5 due to gravity, while the ammonia gas rises and enters the outlet pipe 6, and finally reaches the inside of the reaction chamber 12. At this time, the flue gas and ammonia react inside the reaction chamber 12. Since a one-way valve is provided inside the outlet pipe 6, the flue gas cannot enter the ammonia-liquid separator 5 from the outlet pipe 6. The flue gas can only react with the ammonia gas inside the reaction chamber 12 to denitrify the flue gas.

[0052] Therefore, compared with the prior art, the present invention does not require external steam to be sprayed into water to recover the heat released by the flue gas, which greatly saves costs.

[0053] The present invention achieves the effect of recycling the heat medium inside the tank body 2 by providing a circulation mechanism 13 to circulate and output the heat medium inside the heating chamber 8, thereby solving the problem that the existing technology requires external steam for heating and increases the denitrification cost. At the same time, the circulation mechanism 13 can also promote uniform heating of the water temperature, improve the stratification of the water temperature, and improve the evaporation efficiency of liquid ammonia.

[0054] As a specific embodiment of the present invention, the circulation mechanism 13 includes:

[0055] Motor 131: The motor 131 is located on the top of the tank body 2 and is fixedly connected to the outer surface of the tank body 2;

[0056] The first bevel gear 132 is connected to the output shaft of the motor 131 .

[0057] Second bevel gear 133: There are at least two second bevel gears 133 , which mesh with the first bevel gear 132 ;

[0058] Rotating shaft 134: One end of the rotating shaft 134 is connected to the second bevel gear 133, and the other end of the rotating shaft 134 is connected to the disk 135;

[0059] Connecting rod No. 136: One end of the connecting rod No. 136 is connected to the disc 135, and the other end is connected to the connecting rod No. 2 137;

[0060] Slide plate 138 : The slide plate 138 is annular and is slidably connected to the inner wall of the tank body 2 . One side of the slide plate 138 is connected to the second connecting rod 137 .

[0061] As a specific embodiment of the present invention, a fixing plate 14 is provided on the inner wall of the tank body 2 close to the reaction chamber 12 , and a through hole is provided in the middle of the fixing plate 14 .

[0062] The circulation mechanism 13 of the present invention includes a motor 131, which is located at the top of the tank body 2 and is fixedly connected to the tank body 2. The output shaft of the motor 131 is fixedly connected to a first bevel gear 132, which is meshed with a second bevel gear 133. The number of the second bevel gears 133 is two and they are located on both sides of the first bevel gear 132. The second bevel gear 133 is fixedly connected to a rotating shaft 134, and one end of the rotating shaft 134 is fixedly connected to a disc 135. The tank body 2 is close to the first bevel gear 132. A fixed plate 14 is provided on the inner wall of one side of the reaction chamber 12, and a through hole is provided in the middle of the fixed plate 14. A rotating shaft 134 passes through the through hole in the middle of the fixed plate 14 and is rotatably connected to the fixed plate 14. A fixed rod is provided on the outer surface of the disc 135, and one end of the No. 1 connecting rod 136 is rotatably connected to the fixed rod, and the other end of the No. 1 connecting rod 136 is rotatably connected to the No. 2 connecting rod 137. A slide 138 is hinged at one end of the No. 2 connecting rod 137. The slide 138 is in the shape of a disc 135 and is slidably connected to the inner wall of the tank body 2.

[0063] When the circulation mechanism 13 of the present invention is working, liquid ammonia enters the heating tube disc 7 from the liquid inlet pipe 3, the circulation mechanism 13 is working, the motor 131 is started to drive the output shaft to rotate, and at this time the output shaft drives the No. 1 bevel gear 132 fixedly connected thereto to rotate, the No. 1 bevel gear 132 drives the No. 2 bevel gear 133 meshing therewith to rotate, and the No. 2 bevel gear 133 drives the rotating shaft 134 fixedly connected thereto to rotate. The present invention provides a fixed plate 14 rotatably connected to the rotating shaft 134 to fix the position of the rotating shaft 134. When the rotating shaft 134 rotates, the rotating shaft 134 drives the disc 135 fixedly connected thereto to rotate. Since a fixed rod is fixedly connected to the disc 135, and the fixed rod is rotatably connected to the No. 1 connecting rod 136, when the disc 135 rotates, it drives the fixed rod to rotate; and one end of the No. 1 connecting rod 136 is rotatably connected to the No. 2 connecting rod 137, and one end of the No. 2 connecting rod 137 is hinged to Slide plate 138 is slidably connected to the interior of tank body 2. When connecting rod 136 rotates, connecting rod 137 moves up and down, driving slide plate 138 to slide up and down. As slide plate 138 slides up and down, it squeezes the warm water in the tank into the heating chamber 8 on one side and exchanges with the heat medium heated in the heating chamber 8. As a result, the temperature of the warm water in the tank rises after the exchange with the heat medium heated in the hot chamber, causing the liquid ammonia to evaporate and absorb heat. At this time, the temperature of the warm water in the tank drops again. After the heat medium in the heating chamber 8 exchanges with the warm water in the tank, the temperature continues to rise after being heated by the flue gas. The circulating mechanism 13 exchanges the cooled warm water in the tank with the heat medium heated in the hot chamber again. This is repeated. Due to the high temperature of the flue gas, the ammonia is always in an overheated state during the transportation process, not only does it not require steam connection, but it also avoids secondary condensation of the ammonia. As slide plate 138 slides up and down, it also promotes the fusion of the heat medium in the tank, making the water temperature uniformly distributed, and improving the evaporation efficiency of the ammonia.

[0064] As a specific embodiment of the present invention, a rotating plate 15 is provided at one end of the output shaft of the motor 131 .

[0065] When the circulation mechanism 13 is working, the motor 131 rotates, driving the rotating plate 15 at one end of the output shaft of the motor 131. The liquid inlet pipe 3 and the gas outlet pipe 6 pass through the rotating plate 15 and are rotatably connected to the rotating plate 15. The rotation of the rotating plate 15 promotes the water temperature fusion of the heat medium in the heating chamber 8 and the warm water in the tank, so that the liquid ammonia in the heating tube coil 7 is heated evenly, further promoting the evaporation efficiency of the liquid ammonia.

[0066] As a specific embodiment of the present invention, the heating chamber 8 includes:

[0067] Piston 81: The piston 81 is located inside the heating chamber 8, and a traction line 82 is connected to one side of the piston 81;

[0068] Spring 83 : One side of the spring 83 is fixedly connected to the inner wall of the heating chamber 8 , and the other side of the spring 83 is fixedly connected to the piston 81 .

[0069] In the present invention, the heating chamber 8 includes a piston 81, which is located inside the heating chamber 8 and is slidably connected to the inner wall of the heating chamber 8. The piston 81 is annular, and a traction line 82 is connected to one side of the disk 135. The traction line 82 is in a "Y" shape. One end of the traction line 82 is fixedly connected to the piston 81, and the other end is fixedly connected to the slide 138. A limit block is provided on the inner wall of the heating chamber 8, and a through hole is provided inside the limit block. The traction line 82 passes through the through hole and is slidably connected to the limit block. One end of the spring is fixedly connected to the piston, and the other end of the spring 83 is fixedly connected to the inner wall of the heating chamber 8. There are two springs 83.

[0070] When the circulation mechanism 13 is working, the second connecting rod 137 drives the slide plate 138 to slide up and down. When the slide plate 138 slides downward, the traction line 82 is pulled downward, and the traction line 82 pulls the piston 81 fixedly connected thereto to move upward. When the piston 81 moves upward, the spring 83 fixedly connected thereto is compressed. At this time, the piston 81 moves upward to discharge the heat medium heated in the heating chamber 8 from the liquid exchange pipe 9, and then sucks the warm water from the liquid exchange pipe 9 into the heating chamber 8 tank body 2 from the other end of the piston 81; when the slide plate 138 moves upward, the spring 83 releases the pressure to drive the piston 81 to move downward, and the traction line 82 is also pulled downward. At this time, one end of the piston 81 discharges the heat medium heated in the heating chamber 8 from the liquid exchange pipe 9, and the other end sucks the warm water inside the tank body 2 again, and this is repeated, thereby further promoting the exchange of the heat medium heated in the heating chamber 8 with the warm water inside the tank body 2, so that the ammonia gas is always in an overheated state during the transportation process, thereby improving the evaporation efficiency of the liquid ammonia.

[0071] As a specific embodiment of the present invention, the reaction chamber 12 includes:

[0072] Reaction plate 121: The reaction plate 121 is located inside the reaction chamber 12. There is at least one reaction plate 121. A smoke vent plate 122 is provided at one end of the reaction plate 121.

[0073] Air jet tube 123: An air jet tube 123 is provided inside the reaction plate 121, and there is at least one air jet tube 123.

[0074] Smoke outlet pipe 124 : The smoke outlet pipe 124 is located at one side of the reaction chamber 12 and away from the smoke inlet pipe 11 .

[0075] In the present invention, the reaction chamber 12 includes a reaction plate 121, which is located within the reaction chamber 12 and is at least one in number. One end of the reaction plate 121 is connected to a smoke vent plate 122, and at least one jet pipe 123 is evenly distributed within the reaction plate 121. The other end of the jet pipe 123 is connected to the exhaust pipe 6 within the tank body 2. When flue gas enters the reaction chamber 12 from the flue pipe 10, the flue gas flows over the reaction plate 121, and ammonia enters the jet pipe 123 through the exhaust pipe 6 to react with the flue gas. The reacted flue gas then flows into the smoke vent plate 122, enters the next layer of reaction plate 121, and reacts with the ammonia ejected from the jet pipe 123. This reaction continues in this manner, so that the flue gas and ammonia fully react and are denitrified before being discharged from the exhaust pipe 124. This improves the efficiency of flue gas denitrification. Compared to the prior art, the present invention can achieve real-time denitrification during the production process, eliminating the need for subsequent unified denitrification, significantly saving manpower and material resources.

[0076] As a specific embodiment of the present invention, a spiral liquid channel is provided at the bottom of the ammonia-liquid separator 5 .

[0077] In the present invention, a spiral liquid channel is provided at the bottom of the ammonia-liquid separator 5, through which unevaporated liquid ammonia is discharged faster, thereby promoting the recovery of unevaporated liquid ammonia. This improves the problem that excessive liquid accumulation at the bottom of the ammonia-liquid separator 5 causes the liquid ammonia to be unable to be completely discharged when the liquid ammonia evaporator stops working, resulting in freezing and cracking of the evaporator tubes.

[0078] As a specific embodiment of the present invention, the traction wire 82 is made of galvanized steel wire.

[0079] Galvanized steel wire has high strength, corrosion resistance and long service life. Using galvanized steel wire to make traction line 82 can not only ensure the safety during the working process, but also extend the service life.

[0080] As a specific embodiment of the present invention, a heat-insulating layer 16 is provided on the inner wall of the heating chamber 8 .

[0081] In the present invention, a heat-insulating layer 16 is provided on the inner wall of the heating chamber 8. When the flue gas releases heat to heat the heat medium, the heat-insulating layer 16 can gather the heat and prevent it from being lost, thereby improving the utilization rate of heat recovery.

[0082] As a specific embodiment of the present invention, the material of the spring 83 is heat-resistant steel.

[0083] Heat-resistant steel has a small coefficient of thermal expansion and contraction, and has high strength and good chemical stability at high temperatures. Using heat-resistant steel to manufacture the spring 83 ensures the working stability of the spring 83 and improves the safety factor.

[0084] The specific workflow is as follows:

[0085] The present invention comprises a base 1, a tank body 2 is fixedly mounted on the surface of the base 1, the interior of the tank body 2 is filled with warm water, a liquid inlet pipe 3 is provided on the top of the tank body 2, an ammonia-liquid separator 5 is fixedly mounted inside the tank body 2, an air outlet pipe 6 is provided on the top of the ammonia-liquid separator 5, one end of the air outlet pipe 6 is connected to the reaction chamber 12 and a one-way valve is provided inside the air outlet pipe 6, a liquid outlet pipe 4 is provided at the bottom of the ammonia-liquid separator 5, a heating pipe disc 7 is fixedly connected to the outer surface of the ammonia-liquid separator 5, the heating pipe disc 7 is spiral, and one end of the heating pipe disc 7 is provided. One end is connected to the liquid inlet pipe 3, and the other end is connected to the ammonia liquid separator 5. A heating chamber 8 is fixedly connected to one side of the tank body 2. The heating chamber 8 is annular. A liquid exchange pipe 9 is provided on one side of the heating chamber 8. There are two liquid exchange pipes 9. A flue gas pipe 10 passes through the middle of the heating chamber 8 and is fixedly connected to the heating chamber 8. A flue gas inlet pipe 11 is provided at the bottom of the flue gas pipe 10. The interior of the heating chamber 8 is filled with heat medium, i.e., water. The other end of the flue gas pipe 10 is connected to the reaction chamber 12. When the present invention is working: the flue gas is discharged from the flue gas inlet pipe 1 1 is output to the inside of the flue gas pipe 10 and finally to the inside of the reaction chamber 12. The heat of the flue gas is heated by the heat medium in the heating chamber 8. At the same time, the liquid ammonia enters the heating tube disc 7 from the liquid inlet pipe 3. At this time, the circulation mechanism 13 is started, so that the heat medium after heating in the heating chamber 8 continuously enters the inside of the tank body 2 through the liquid exchange pipe 9, heating the warm water in the tank body 2, and vaporizing the liquid ammonia. The vaporized ammonia in the heating tube disc 7 is mixed with the liquid ammonia and enters the ammonia-liquid separator 5. The ammonia-liquid separator 5 in the present invention is The principle of the existing technology is that the mixed ammonia gas and liquid ammonia enter the ammonia-liquid separator, the unevaporated liquid ammonia drips to the bottom of the ammonia-liquid evaporator 5 due to gravity, while the ammonia gas rises and enters the outlet pipe 6, and finally reaches the inside of the reaction chamber 12. At this time, the flue gas and ammonia react inside the reaction chamber 12. Since a one-way valve is provided inside the outlet pipe 6, the flue gas cannot enter the ammonia-liquid separator 5 from the outlet pipe 6. The flue gas can only react with the ammonia inside the reaction chamber 12 to denitrify the flue gas.

[0086] Therefore, compared with the prior art, the present invention does not require external steam to be sprayed into water to recover the heat released by the flue gas, which greatly saves costs.

[0087] The present invention achieves the effect of recycling the heat medium inside the tank body 2 by providing a circulation mechanism 13 to circulate and output the heat medium inside the heating chamber 8, thereby solving the problem that the existing technology requires external steam for heating and increases the denitrification cost. At the same time, the circulation mechanism 13 can also promote uniform heating of the water temperature, improve the stratification of the water temperature, and improve the evaporation efficiency of liquid ammonia.

[0088] The circulation mechanism 13 of the present invention includes a motor 131, which is located at the top of the tank body 2 and is fixedly connected to the tank body 2. The output shaft of the motor 131 is fixedly connected to a first bevel gear 132, which is meshed with a second bevel gear 133. The number of the second bevel gears 133 is two and they are located on both sides of the first bevel gear 132. The second bevel gear 133 is fixedly connected to a rotating shaft 134, and one end of the rotating shaft 134 is fixedly connected to a disc 135. The tank body 2 is close to the first bevel gear 132. A fixed plate 14 is provided on the inner wall of one side of the reaction chamber 12, and a through hole is provided in the middle of the fixed plate 14. A rotating shaft 134 passes through the through hole in the middle of the fixed plate 14 and is rotatably connected to the fixed plate 14. A fixed rod is provided on the outer surface of the disc 135, and one end of the No. 1 connecting rod 136 is rotatably connected to the fixed rod, and the other end of the No. 1 connecting rod 136 is rotatably connected to the No. 2 connecting rod 137. A slide 138 is hinged at one end of the No. 2 connecting rod 137. The slide 138 is in the shape of a disc 135 and is slidably connected to the inner wall of the tank body 2.

[0089] When the circulation mechanism 13 of the present invention is working, liquid ammonia enters the heating tube disc 7 from the liquid inlet pipe 3, the circulation mechanism 13 is working, the motor 131 is started to drive the output shaft to rotate, and at this time the output shaft drives the No. 1 bevel gear 132 fixedly connected thereto to rotate, the No. 1 bevel gear 132 drives the No. 2 bevel gear 133 meshing therewith to rotate, and the No. 2 bevel gear 133 drives the rotating shaft 134 fixedly connected thereto to rotate. The present invention provides a fixed plate 14 rotatably connected to the rotating shaft 134 to fix the position of the rotating shaft 134. When the rotating shaft 134 rotates, the rotating shaft 134 drives the disc 135 fixedly connected thereto to rotate. Since a fixed rod is fixedly connected to the disc 135, and the fixed rod is rotatably connected to the No. 1 connecting rod 136, when the disc 135 rotates, it drives the fixed rod to rotate; and one end of the No. 1 connecting rod 136 is rotatably connected to the No. 2 connecting rod 137, and one end of the No. 2 connecting rod 137 is hinged to Slide plate 138 is slidably connected to the interior of tank body 2. When connecting rod 136 rotates, connecting rod 137 moves up and down, driving slide plate 138 to slide up and down. As slide plate 138 slides up and down, it squeezes the warm water in the tank into the heating chamber 8 on one side and exchanges with the heat medium heated in the heating chamber 8. As a result, the temperature of the warm water in the tank rises after the exchange with the heat medium heated in the hot chamber, causing the liquid ammonia to evaporate and absorb heat. At this time, the temperature of the warm water in the tank drops again. After the heat medium in the heating chamber 8 exchanges with the warm water in the tank, the temperature continues to rise after being heated by the flue gas. The circulating mechanism 13 exchanges the cooled warm water in the tank with the heat medium heated in the hot chamber again. This is repeated. Due to the high temperature of the flue gas, the ammonia is always in an overheated state during the transportation process, not only does it not require steam connection, but it also avoids secondary condensation of the ammonia. As slide plate 138 slides up and down, it also promotes the fusion of the heat medium in the tank, making the water temperature uniformly distributed, and improving the evaporation efficiency of the ammonia.

[0090] When the circulation mechanism 13 is working, the motor 131 rotates, driving the rotating plate 15 at one end of the output shaft of the motor 131. The liquid inlet pipe 3 and the gas outlet pipe 6 pass through the rotating plate 15 and are rotatably connected to the rotating plate 15. The rotation of the rotating plate 15 promotes the water temperature fusion of the heat medium in the heating chamber 8 and the warm water in the tank, so that the liquid ammonia in the heating tube coil 7 is heated evenly, further promoting the evaporation efficiency of the liquid ammonia.

[0091] In the present invention, the heating chamber 8 includes a piston 81, which is located inside the heating chamber 8 and is slidably connected to the inner wall of the heating chamber 8. The piston 81 is annular, and a traction line 82 is connected to one side of the disk 135. The traction line 82 is in a "Y" shape. One end of the traction line 82 is fixedly connected to the piston 81, and the other end is fixedly connected to the slide 138. A limit block is provided on the inner wall of the heating chamber, and a through hole is provided inside the limit block. The traction line 82 passes through the through hole and is slidably connected to the limit block. One end of the spring is fixedly connected to the piston, and the other end of the spring 83 is fixedly connected to the inner wall of the heating chamber 8. There are two springs 83.

[0092] When the circulation mechanism 13 is working, the second connecting rod 137 drives the slide plate 138 to slide up and down. When the slide plate 138 slides downward, the traction line 82 is pulled downward, and the traction line 82 pulls the piston 81 fixedly connected thereto to move upward. When the piston 81 moves upward, the spring 83 fixedly connected thereto is compressed. At this time, the piston 81 moves upward to discharge the heat medium heated in the heating chamber 8 from the liquid exchange pipe 9, and then sucks the warm water from the liquid exchange pipe 9 into the heating chamber 8 tank body 2 from the other end of the piston 81; when the slide plate 138 moves upward, the spring 83 releases the pressure to drive the piston 81 to move downward, and the traction line 82 is also pulled downward. At this time, one end of the piston 81 discharges the heat medium heated in the heating chamber 8 from the liquid exchange pipe 9, and the other end sucks the warm water inside the tank body 2 again, and this is repeated, thereby further promoting the exchange of the heat medium heated in the heating chamber 8 with the warm water inside the tank body 2, so that the ammonia gas is always in an overheated state during the transportation process, thereby improving the evaporation efficiency of the liquid ammonia.

[0093] In the present invention, the reaction chamber 12 includes a reaction plate 121, which is located within the reaction chamber 12 and is at least one in number. One end of the reaction plate 121 is connected to a smoke vent plate 122, and at least one jet pipe 123 is evenly distributed within the reaction plate 121. The other end of the jet pipe 123 is connected to the exhaust pipe 6 within the tank body 2. When flue gas enters the reaction chamber 12 from the flue pipe 10, the flue gas flows over the reaction plate 121, and ammonia enters the jet pipe 123 through the exhaust pipe 6 to react with the flue gas. The reacted flue gas then flows into the smoke vent plate 122, enters the next layer of reaction plate 121, and reacts with the ammonia ejected from the jet pipe 123. This reaction continues in this manner, so that the flue gas and ammonia fully react and are denitrified before being discharged from the exhaust pipe 124. This improves the efficiency of flue gas denitrification. Compared to the prior art, the present invention can achieve real-time denitrification during the production process, eliminating the need for subsequent unified denitrification, significantly saving manpower and material resources.

[0094] In the present invention, a spiral liquid channel is provided at the bottom of the ammonia-liquid separator 5, and unevaporated liquid ammonia is discharged through the spiral liquid channel to accelerate the discharge, thereby promoting the recovery of unevaporated liquid ammonia, and improving the problem that excessive liquid accumulation at the bottom of the separator causes the liquid ammonia to be unable to be completely discharged when the liquid ammonia evaporator is stopped, resulting in freezing and cracking of the evaporator tubes.

[0095] Galvanized steel wire has high strength, corrosion resistance and long service life. Using galvanized steel wire to make traction line 82 can not only ensure the safety during the working process, but also extend the service life.

[0096] In the present invention, a heat-insulating layer 16 is provided on the inner wall of the heating chamber 8. When the flue gas releases heat to heat the heat medium, the heat-insulating layer 16 can gather the heat and prevent it from being lost, thereby improving the utilization rate of heat recovery.

[0097] Heat-resistant steel has a small coefficient of thermal expansion and contraction, and has high strength and good chemical stability at high temperatures. Using heat-resistant steel to manufacture the spring 83 ensures the working stability of the spring 83 and improves the safety factor.

[0098] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid ammonia evaporator for flue gas denitrification, comprising a base (1), a tank body (2) provided on the surface of the base (1), a liquid inlet pipe (3) provided on the top of the tank body (2), an ammonia-liquid separator (5) provided inside the tank body (2), an air outlet pipe (6) provided on the top of the ammonia-liquid separator (5), a liquid outlet pipe (4) provided on the bottom of the ammonia-liquid separator (5), and a heating tube coil (7) provided on the outer surface of the ammonia-liquid separator (5), characterized in that: Also includes: Heating chamber (8): a liquid exchange pipe (9) is provided on one side of the heating chamber, the liquid exchange pipe (9) is connected to the tank body (2), a smoke pipe (10) is provided on the outer surface of the heating chamber (8), a smoke inlet pipe (11) is provided at the bottom of the smoke pipe (10), and the heating chamber (8) is used to heat the heat medium; Reaction chamber (12): the reaction chamber (12) is located on the top of the tank body (2), and the reaction chamber (12) is used for flue gas denitrification; Circulation mechanism (13): the circulation mechanism (13) is located inside the tank body (2), and the circulation mechanism (13) circulates the heat medium inside the heating chamber (8) through the inside of the tank body (2); The heating chamber (8) comprises: Piston (81): The piston (81) is located inside the heating chamber (8) and is slidably connected to the inner wall of the heating chamber (8), and a traction line (82) is connected to one side of the piston (81); Spring (83): one side of the spring (83) is fixedly connected to the inner wall of the heating chamber (8), and the other side of the spring (83) is fixedly connected to the piston (81); The circulation mechanism (13) comprises: Motor (131): the motor (131) is located on the top of the tank body (2) and is fixedly connected to the outer surface of the tank body (2); A first bevel gear (132): the first bevel gear (132) is connected to the output shaft of the motor (131); Second bevel gear (133): the number of the second bevel gear (133) is at least two, and the second bevel gear (133) is meshed with the first bevel gear (132); Rotating shaft (134): one end of the rotating shaft (134) is connected to the second bevel gear (133), and the other end of the rotating shaft (134) is connected to a disc (135); Connecting rod No. 1 (136): One end of the connecting rod No. 1 (136) is connected to the disc (135), and the other end is connected to the connecting rod No. 2 (137); Slide plate (138): The slide plate (138) is annular, and the slide plate (138) is slidably connected to the inner wall of the tank body (2), and one side of the slide plate (138) is connected to the second connecting rod (137); A traction line (82) is connected to one side of the disc (135), and the traction line (82) is in a Y-shape. One end of the forked traction line (82) is fixedly connected to the piston (81), and the other end is fixedly connected to the slide plate (138); When the circulation mechanism (13) is working, the second connecting rod (137) drives the slide plate (138) to slide up and down. When the slide plate (138) slides downward, the traction line (82) is pulled downward, and the traction line (82) pulls the piston (81) fixedly connected thereto to move upward. When the piston (81) moves upward, the spring (83) fixedly connected thereto is compressed. At this time, the piston (81) moves upward to discharge the heated heat medium inside the heating chamber (8) from the liquid exchange pipe (9), and then absorbs the warm water from the liquid exchange pipe (9) into the heating chamber (8) tank body (2) from the other end of the piston (81); when the slide plate (138) moves upward, the spring (83) releases the pressure and drives the piston (81) to move downward. The traction line (82) is also pulled downward. At this time, one end of the piston (81) discharges the heated heat medium inside the heating chamber (8) from the liquid exchange pipe (9), and the other end absorbs the warm water inside the tank body (2).

2. The liquid ammonia evaporator for flue gas denitrification according to claim 1, characterized in that: A fixing plate (14) is provided on the inner wall of the tank body (2) on one side close to the reaction chamber (12), and a through hole is provided in the middle of the fixing plate (14).

3. The liquid ammonia evaporator for flue gas denitrification according to claim 1, characterized in that: A rotating plate (15) is provided at one end of the output shaft of the motor (131).

4. The liquid ammonia evaporator for flue gas denitrification according to claim 1, characterized in that: The reaction chamber (12) comprises: Reaction plate (121): the reaction plate (121) is located inside the reaction chamber (12), the number of the reaction plate (121) is at least one, and a smoke vent plate (122) is provided at one end of the reaction plate (121); Air jet pipe (123): an air jet pipe (123) is provided inside the reaction plate (121), and the number of the air jet pipe (123) is at least one; Smoke outlet pipe (124): the smoke outlet pipe (124) is located on one side of the reaction chamber (12) and away from the smoke inlet pipe (11).

5. The liquid ammonia evaporator for flue gas denitrification according to claim 1, characterized in that: A spiral liquid channel is provided at the bottom of the ammonia-liquid separator (5).

6. The liquid ammonia evaporator for flue gas denitrification according to claim 1, characterized in that: The material of the pulling wire (82) is galvanized steel wire.

7. The liquid ammonia evaporator for flue gas denitrification according to claim 1, characterized in that: The inner wall of the heating chamber (8) is provided with a heat-insulating layer (16).

8. The liquid ammonia evaporator for flue gas denitrification according to claim 1, characterized in that: The material of the spring (83) is heat-resistant steel.

Images