Device and method for recovering ammonium bicarbonate from fuel boiler tail gas

Abstract

The invention discloses a device and method for recovering ammonium bicarbonate from fuel boiler tail gas, and the device comprises a washing purification tower, a filler supporting plate is arranged in the washing purification tower, a filler medium is arranged on the filler supporting plate, a filler pressing plate for providing extrusion force is arranged above the filler medium, and an electric control telescopic rod is arranged in the washing purification tower. The telescopic end of the electric control telescopic rod is connected with the surface of the filler pressing plate, a pressure sensor used for detecting extrusion force is arranged on the electric control telescopic rod or the filler pressing plate, and the telescopic amplitude of the electric control telescopic rod is controlled based on the numerical value of the extrusion force; the pressure sensor is additionally arranged on the surface of the packing pressing plate, the pressure borne by the packing medium can be visually detected, when the pressure borne by the packing medium is too large, the position of the packing pressing plate is adjusted through the electric control telescopic rod, the pressure borne by the packing medium is improved, and the situation that the packing medium is too large in pressure is avoided. And the condition that the packing medium is crushed is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of comprehensive recovery and recycling of waste gas and waste water in rare earth industry smelting and separation, and particularly relates to a device and method for recovering ammonium bicarbonate from fuel boiler tail gas. BACKGROUND

[0002] In the process of rare earth smelting and separation, ammonia water and ammonium bicarbonate are essential auxiliary raw materials for ammonium saponification and single product ammonium carbonate precipitation in the process of rare earth smelting. The final discharged waste water after rare earth smelting is ammonium chloride waste water. After recovery and treatment, a large amount of dilute ammonia water is formed, which contains a high concentration of ammonia nitrogen. If it is directly discharged without treatment, it will cause a large number of algae to reproduce in the water body, and further cause ecological problems such as water bloom and red tide. In the existing recovery and treatment of dilute ammonia water, dilute ammonia water is usually synthesized with carbon dioxide to recover ammonium bicarbonate, and the synthesized ammonium bicarbonate is used in the smelting process of rare earth, realizing the effect of recycling of dilute ammonia water.

[0003] A production device for recovering carbon dioxide from carbon-containing tail gas to produce ammonium bicarbonate is disclosed in a patent with publication number CN222829633U and publication date May 6, 2025. The device includes a first box, a filter mechanism is arranged on the front side of the second box, and a stirring mechanism is arranged on the top of the first box. High-concentration ammonia water prepared by deamination and concentration is poured into the second box through the feed pipe, and the filter plate in the second box filters the impurity particles in the ammonia water to prevent the impurity particles from being injected into the first box together with the ammonia water. The filter plate is extracted from the sliding groove to replace the filter plate, and the replaced filter plate is slid into the sliding groove. The left side of the filter plate contacts the right end of the fixed block, and the fixed block can resist the left side of the filter plate through the elastic force of the spring to fix the filter plate. The stirring mechanism can make the ammonia water in the first box and various tail gases in the carbon dioxide fully react through the two rotating modes of the stirring rod to generate ammonium bicarbonate.

[0004] The tail gas generated by the existing combustion boiler is input from the bottom of the packing tower and is countercurrently contacted with the aqueous phase from the top of the packing tower to remove impurities such as sulfur and nitrate in the tail gas before the preparation of ammonium bicarbonate. The existing packing tower is internally provided with packing media for increasing the gas-liquid two-phase contact area to enable the gas-liquid two phases to be fully mixed, thereby improving the mass transfer efficiency. In order to avoid the packing being blown up during upward flow, causing the packing media to be loose, a packing pressing plate is usually arranged above the packing media in the packing tower to press the packing media. The existing packing pressing plate is usually freely placed on the upper end of the packing media and relies on the gravity of the packing pressing plate to press the packing media. If the mass of the packing pressing plate is too large, the packing pressing plate may exert excessive pressure on the packing media below, which may easily cause excessive packing media to be crushed. SUMMARY

[0005] The purpose of the present application is to provide a device and method for recovering ammonium bicarbonate from fuel boiler tail gas to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A device for recovering ammonium bicarbonate from fuel boiler tail gas, comprising a washing and purifying tower, a packing support plate is arranged in the washing and purifying tower, a packing medium is arranged on the packing support plate, a packing pressing plate for providing extrusion pressure is arranged above the packing medium, an electric control telescopic rod is arranged in the washing and purifying tower, the telescopic end of the electric control telescopic rod is connected with the surface of the packing pressing plate, a pressure sensor for detecting the extrusion pressure is arranged on the electric control telescopic rod or the packing pressing plate, and the telescopic amplitude of the electric control telescopic rod is controlled based on the value of the extrusion pressure.

[0008] The packing pressing plate is made of elastic material as a whole.

[0009] The electric control telescopic rod is further connected with a driving motor, the driving motor is fixedly installed on the inner wall of the washing and purifying tower, the driving end of the driving motor is connected with the electric control telescopic rod, and the packing pressing plate is synchronously rotated with the electric control telescopic rod based on the working of the driving motor while the electric control telescopic rod drives the packing pressing plate to move up and down.

[0010] The packing pressing plate comprises a pressing plate frame, an upper pressing plate is fixedly installed on the pressing plate frame, the upper pressing plate is connected with the telescopic end of the electric control telescopic rod, a plurality of channels for gas and liquid to pass through are uniformly arranged on the upper pressing plate, a material stirring pressing plate is rotatably installed on the lower end surface of the upper pressing plate through a rotating shaft, a limiting baffle is further arranged on the lower end surface of the upper pressing plate, and the limiting baffle is used for limiting the rotation angle of the material stirring pressing plate.

[0011] The above-mentioned, the existence of horizontal and vertical two kinds of placement state of the stirring pressure plate, when the stirring pressure plate is placed horizontally, the bottom surface of the stirring pressure plate is flush with the bottom surface of the pressure plate frame, when the stirring pressure plate is placed vertically, the stirring pressure plate protrudes from the bottom surface of the pressure plate frame.

[0012] The above-mentioned, the inside of the washing purification tower is also provided with an adjusting part, which is used for adjusting the stirring pressure plate to switch between the above two states.

[0013] The above-mentioned, the adjusting part includes a first electromagnet, a second electromagnet and a position sensor installed on the inner wall of the washing purification tower, the first electromagnet is installed on the bottom surface of the upper pressure plate, the second electromagnet is installed on the surface of the stirring pressure plate close to the first electromagnet.

[0014] The above-mentioned, a plurality of avoiding grooves are opened on the lower end surface of the upper pressure plate, a plurality of the avoiding grooves correspond to a plurality of the first electromagnets one by one, the first electromagnet is slidingly installed in the avoiding groove, the first electromagnet and the avoiding groove are connected through a pressure spring.

[0015] The above-mentioned, the pressure plate frame has a fixed segment and an active segment to form a ring structure, the fixed segment is fixedly connected with the side wall of the upper pressure plate, the fixed segment and the active segment are arc-shaped structures, the outer circular surface of the active segment is made of rubber material, a passive push rod is connected on the active segment, the passive push rod extends into the avoiding groove, an adjusting wedge is arranged on the passive push rod, an extrusion wedge is arranged on the end of the first electromagnet away from the second electromagnet, the extrusion wedge abuts against the surface of the adjusting wedge.

[0016] A method for recovering ammonium bicarbonate from fuel boiler tail gas, by a device for recovering ammonium bicarbonate from fuel boiler tail gas, when ammonium bicarbonate is recovered from fuel boiler tail gas, comprising the following steps:

[0017] S1: collecting low-concentration ammonium chloride wastewater generated in the rare earth smelting and separation process and waste gas discharged in the boiler kiln;

[0018] S2: the workers pass the waste gas and ammonium chloride wastewater into the washing purification tower for countercurrent contact, so that the fine powder and impurities such as sulfur and nitrate in the waste gas enter the water phase, the contacted water phase is discharged into the ammonium chloride wastewater pool for comprehensive recovery, and the purified tail gas is passed into the synthesis reaction tower;

[0019] S3: using pressure suction fan suction, so that the above-mentioned purified tail gas from the bottom of the synthetic reaction tower, then, from the side wall of the synthetic reaction tower into the dilute ammonia water, the washing water from the top of the tower, according to the dilute ammonia water concentration control washing water flow will be diluted to 1.5-2mol / l, so that the concentration of ammonium bicarbonate solution at the bottom of the tower is 1.5-2mol / l, so that the ammonium bicarbonate saturated liquid with PH value of 7-9 flows out from the bottom of the synthetic reaction tower.

[0020] The beneficial effects of the present application are that in the above technical solution, the present application can directly detect the pressure received by the filler medium by adding a pressure sensor on the surface of the filler pressing plate. When the pressure received by the filler medium is too large, the position of the filler pressing plate is adjusted by the electric control telescopic rod to improve the pressure received by the filler medium and avoid the situation that too much filler medium is crushed due to the excessive pressure received by the filler medium. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments or prior art of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0022] Figure 1 A structure schematic diagram of a device for recovering ammonium bicarbonate from fuel boiler tail gas provided by an embodiment of the present application;

[0023] Figure 2 An internal structure schematic diagram of a washing and purification tower provided by an embodiment of the present application;

[0024] Figure 3 An internal structure schematic diagram of a washing and purification tower provided by another embodiment of the present application;

[0025] Figure 4 A schematic diagram of a vertical placement state of a filler pressing plate provided by another embodiment of the present application;

[0026] Figure 5 A bottom surface structure schematic diagram of a filler pressing plate provided by another embodiment of the present application;

[0027] Figure 6 A bottom surface structure schematic diagram of a filler pressing plate provided by another embodiment of the present application;

[0028] Figure 7 A sectional view schematic diagram of a filler pressing plate provided by another embodiment of the present application;

[0029] Figure 8 An enlarged schematic diagram of A provided by another embodiment of the present application;

[0030] Figure 9 The first electromagnet and the upper pressing plate of another embodiment of the present application are matched.

[0031] Explanation of reference signs:

[0032] 1, washing purification tower; 11, discharge port; 12, feed inlet; 2, filler support plate; 3, filler medium; 4, filler pressing plate; 41, pressing plate frame; 411, fixed section; 412, movable section; 413, passive push rod; 414, adjusting wedge; 415, extrusion wedge; 42, upper pressing plate; 43, channel; 44, rotating shaft; 45, material pushing pressing plate; 46, avoiding groove; 47, pressure bearing spring; 5, pressure sensor; 6, electric control telescopic rod; 7, driving motor; 8, adjusting part; 81, first electromagnet; 82, second electromagnet; 83, position sensor. DETAILED DESCRIPTION

[0033] In order for those skilled in the art to better understand the technical solutions of the present application, the following will combine the accompanying drawings to further describe the present application in detail. Figures 1-9 Further detailed description of the present application.

[0034] The device for recovering ammonium bicarbonate from fuel boiler tail gas provided by the embodiment of the present application comprises a washing purification tower 1, the washing purification tower 1 is provided with a filler support plate 2, the filler support plate 2 is provided with a filler medium 3, the upper part of the filler medium 3 is provided with a filler pressing plate 4 for providing extrusion force, the washing purification tower 1 is provided with an electric control telescopic rod 6, the telescopic end of the electric control telescopic rod 6 is connected with the surface of the filler pressing plate 4, the electric control telescopic rod 6 or the filler pressing plate 4 is provided with a pressure sensor 5 for detecting the extrusion force, and the telescopic amplitude of the electric control telescopic rod 6 is controlled based on the value of the extrusion force.

[0035] Specifically, in the embodiment, the washing and purifying tower 1 is vertically arranged on the ground in a cylindrical shape, a gas inlet and a liquid outlet are arranged at the bottom of the washing and purifying tower 1, a gas outlet is arranged at the top of the washing and purifying tower 1, and a liquid inlet is arranged on the sidewall of the washing and purifying tower 1 and connected to a liquid distributor which is located above the filler pressing plate 4 and used to uniformly distribute liquid to the top of the filler medium 3. The liquid distributor can be a nozzle type liquid distributor, a pipe type liquid distributor or other liquid distributor mechanisms. The filler support plate 2 is located below the filler pressing plate 4, and a containing space is formed between the filler support plate 2 and the filler pressing plate 4 to place the filler medium 3. The filler support plate 2 and the filler pressing plate 4 are adapted to the inner diameter of the washing and purifying tower 1, and a large number of openings are arranged on the filler support plate 2 and the filler pressing plate 4 for gas and liquid to pass through. The filler medium 3 can be ceramic, graphite, Rasching ring or other fillers. When the exhaust gas discharged from the boiler or kiln needs to be washed, the gas is sent into the washing and purifying tower 1 from the gas inlet at the bottom of the washing and purifying tower 1, and the washing liquid for washing the exhaust gas is introduced into the liquid distributor through the liquid inlet on the washing and purifying tower 1. As the exhaust gas enters from the bottom of the washing and purifying tower 1, the gas moves upward towards the gas outlet at the top of the washing and purifying tower 1. The liquid distributor divides the washing liquid to make it uniformly fall on the top of the filler medium 3 below, and the washing liquid flows downward and contacts the upward moving exhaust gas to transfer mass. The washing liquid carries away the micro-powder and impurities such as sulfur and nitrate in the exhaust gas to purify the exhaust gas. The purified exhaust gas leaves the washing and purifying tower 1 from the gas outlet at the top of the washing and purifying tower 1, and the washing liquid that has completed the washing treatment leaves the washing and purifying tower 1 from the liquid outlet at the bottom of the washing and purifying tower 1, thus completing the washing and purifying treatment of the exhaust gas.

[0036] The deficiency of the prior art is that: in the existing washing and purifying tower 1, the filler pressing plate 4 is usually placed freely above the filler medium 3, and the filler pressing plate 4 is pressed against the filler medium 3 by its own gravity. However, when the filler medium 3 is made of fragile materials such as ceramics and graphite, the filler medium 3 may be broken due to wear and impact during use, and the broken debris will accumulate in the gap between the filler medium 3, resulting in a decrease in the void fraction of the filler medium 3. At this time, although the filler pressing plate 4 moves following the sinking of the filler medium 3 to ensure the compression of the filler medium 3, if the filler medium 3 is compressed by the gravity of the filler pressing plate 4, when the mass of the filler pressing plate 4 is too large, the filler pressing plate 4 may exert excessive pressure on the filler medium 3 below, which is easy to cause more filler medium 3 below the filler pressing plate 4 to be crushed, and the generated debris further blocks the gap of the filler medium 3, increases the flow resistance of the gas and liquid, and reduces the mass transfer efficiency of the gas-liquid two-phase, thereby affecting the purification efficiency of the waste gas.

[0037] In order to solve the above problems, in the present embodiment, the pressure sensor 5 is used to detect the pressure exerted by the filler pressing plate 4 on the filler medium 3. The pressure sensor 5 can be arranged at the center position of the side (bottom surface) of the filler pressing plate 4 close to the filler medium 3, or directly arranged on the electric control telescopic rod 6. (Even multiple pressure sensors 5 can be installed at different positions on the bottom surface of the filler pressing plate 4, and the multiple pressure sensors 5 are uniformly distributed on the bottom surface of the filler pressing plate 4, and more comprehensive and accurate pressure data can be obtained through comprehensive analysis of the data of multiple pressure sensors 5.) The pressure data detected by the pressure sensor 5 is the prior art, and will not be described in detail. The electric control telescopic rod 6 is connected to the inner wall of the washing and purifying tower 1 through a mounting bracket, and the telescopic end of the electric control telescopic rod 6 is connected to the center position of the filler pressing plate 4. When the filler pressing plate 4 is pressed above the filler medium 3, the pressure sensor 5 can directly detect the pressure received by the filler medium 3, so as to ensure the compression of the filler medium 3 by the filler pressing plate 4. When the pressure sensor 5 detects that the pressure received by the filler medium 3 is too large, the pressure sensor 5 sends a working signal to the electric control telescopic rod 6, and the electric control telescopic rod 6 moves with the filler pressing plate 4 in the washing and purifying tower 1, so that the pressure value detected by the pressure sensor 5 reaches a specified value range, thereby improving the pressure received by the filler medium 3 and avoiding the situation that the filler medium 3 is crushed due to excessive pressure.

[0038] Preferably, the filler pressing plate 4 is made of elastic material.

[0039] Specifically, in the embodiment, the filler pressing plate 4 can be made of hard rubber. When the filler pressing plate 4 is pressed on the filler medium 3, the lower end surface of the filler pressing plate 4 is in contact with the filler medium 3. When the filler pressing plate 4 is in contact with the filler medium 3, the filler pressing plate 4 is elastically deformed slightly. The surface of the filler pressing plate 4 can be deformed adaptively according to the shape of the filler medium 3 in contact with the surface, so that the pressure from the filler pressing plate 4 is uniformly distributed on the filler medium 3, avoiding uneven stress on the filler medium 3. When the gas flow enters from the bottom of the washing and purifying tower 1 and moves towards the gas outlet at the top, if the flow rate of the gas flow is too large, the gas flow is likely to drive the filler medium 3 to move upwards. The contact between the filler medium 3 and the soft filler pressing plate 4 can reduce the damage and breakage of the filler medium 3.

[0040] It should be further noted that after long-term use, the filler medium 3 in the washing and purifying tower 1 is easily damaged due to long-term extrusion, which can cause the performance of the filler medium 3 to decrease, thereby affecting the mass transfer efficiency of the gas-liquid in the washing and purifying tower 1. Therefore, the filler medium 3 in the washing and purifying tower 1 needs to be replaced regularly. When the existing filler medium 3 is replaced, the filler pressing plate 4 is first removed, and the filler medium 3 below the filler pressing plate 4 is removed from the washing and purifying tower 1, and new filler medium 3 is replaced. After replacing the new filler medium 3, the filler medium 3 needs to be laid flat multiple times to ensure that the filler medium 3 is uniform during the laying process, so that the filler medium 3 can be uniformly stressed, and the local pressure is too large when the filler medium 3 is extruded by the filler pressing plate 4. During the laying process of the filler medium 3, the worker needs to waste a lot of time to lay and lay flat layer by layer to adjust the placement of the filler medium 3, which increases the downtime of the washing and purifying tower 1 and affects the washing efficiency of the washing and purifying tower 1.

[0041] To solve the above problems, as Figure 3As shown, in another embodiment of the present application, the electric control telescopic rod 6 is further connected with a driving motor 7, the driving motor 7 is fixedly installed on the inner wall of the washing and purifying tower 1, the driving end of the driving motor 7 is connected with the electric control telescopic rod 6, when the electric control telescopic rod 6 drives the filler pressing plate 4 to move up and down, based on the working of the driving motor 7, the filler pressing plate 4 rotates synchronously with the electric control telescopic rod 6, the filler pressing plate 4 comprises a ring-shaped pressing plate frame 41, the pressing plate frame 41 is fixedly installed with an upper pressing plate 42, the upper pressing plate 42 is connected with the telescopic end of the electric control telescopic rod 6, a plurality of passages 43 for gas and liquid to pass through are uniformly arranged on the upper pressing plate 42, a stirring pressing plate 45 is rotatably installed on the lower end surface of the upper pressing plate 42 through a rotating shaft 44, the stirring pressing plate 45 has horizontal and vertical two placing states, when the stirring pressing plate 45 is horizontally placed, the bottom surface of the stirring pressing plate 45 is flush with the bottom surface of the pressing plate frame 41, when the stirring pressing plate 45 is vertically placed, the stirring pressing plate 45 protrudes from the bottom surface of the pressing plate frame 41, a limiting baffle (not shown in the figure) is further arranged on the lower end surface of the upper pressing plate 42, the limiting baffle is in the shape of a rectangular strip, the limiting baffle is vertically arranged on the lower end surface of the upper pressing plate 42, the limiting baffle is used to limit the rotating angle of the stirring pressing plate 45 to make it in the vertical state and not continue to rotate, it should be noted that in this embodiment, the rotating angle of the stirring pressing plate 45 should be less than ninety degrees, the inner of the washing and purifying tower 1 is further provided with an adjusting part 8, the adjusting part 8 is used to adjust the stirring pressing plate 45 to switch between the above two states, the adjusting part 8 comprises a first electromagnet 81, a second electromagnet 82 and a position sensor 83 installed on the inner wall of the washing and purifying tower 1, the first electromagnet 81 is installed on the bottom surface of the upper pressing plate 42, the second electromagnet 82 is installed on the surface of the stirring pressing plate 45 close to the first electromagnet 81.

[0042] Specifically, in the embodiment, the upper pressing plate 42 and the material pushing plate 45 are made of hard rubber, and in the initial state, the material pushing plate 45 is horizontally placed. At this time, the first electromagnet 81 and the second electromagnet 82 attract each other. In order to facilitate the staff to replace the filler medium 3 in the washing and purifying tower 1, the washing and purifying tower 1 is usually provided with a discharge port 11 and a feeding port 12 on the side wall. The discharge port 11 is usually arranged above the filler support plate 2, and the bottom of the discharge port 11 is flush with the filler support plate 2. The feeding port 12 is arranged below the liquid distributor. The pressing plate frame 41 is in the shape of a ring, and the outer diameter of the pressing plate frame 41 is matched with the inner wall of the washing and purifying tower 1. The material pushing plate 45 is in the shape of a long strip, and the length of the material pushing plate 45 is longer than the radius of the upper pressing plate 42. When the material pushing plate 45 rotates to about 90 degrees, the material pushing plate 45 is blocked by the side wall of the limiting baffle, so as to limit the continuous rotation of the material pushing plate 45. When the driving motor 7 drives the electric control telescopic rod 6 to rotate with the material pushing plate 45, it should be ensured that the pushing direction of the filler medium 3 on the material pushing plate 45 is consistent with the rotation direction of the material pushing plate 45, so as to avoid that the filler medium 3 drives the material pushing plate 45 to return to the horizontal state when the material pushing plate 45 pushes the filler medium 3, which affects the pushing process of the filler medium 3. Obviously, since the upper pressing plate 42 is uniformly provided with the holes for the gas and liquid to pass through, the channel 43 on the upper surface of the upper pressing plate 42 should not be blocked when the material pushing plate 45 is horizontally placed. Therefore, the material pushing plate 45 should also be provided with a plurality of channels 43, and the channels 43 on the material pushing plate 45 correspond to the channels 43 on the upper surface of the upper pressing plate 42. When the filler pressing plate 4 is pressed on the filler medium 3, it is convenient for the gas and liquid to pass through.

[0043] When the replacement of the filler medium 3 is needed, the staff opens the discharge port 11, the filler medium 3 leaves the inside of the washing and purifying tower 1 along the discharge port 11, when the filler medium 3 in the inside of the washing and purifying tower 1 is completely discharged, the staff closes the discharge port 11, opens the feeding port 12, then the electric control telescopic rod 6 drives the filler pressing plate 4 to move upward along the vertical direction until the filler pressing plate 4 is above the feeding port 12, the staff fills the filler medium 3 into the washing and purifying tower 1 through the feeding port 12, the filler medium 3 entering the washing and purifying tower 1 is blocked by the filler supporting plate 2, the filler medium 3 is stacked on the filler supporting plate 2 to form a filler layer, in this embodiment, the filling of the whole filler layer is completed for multiple times, after the first filling treatment is completed, the staff stops filling, then the electric control telescopic rod 6 drives the filler pressing plate 4 to move upward to the position of the position sensor 83, the position sensor 83 sends a signal, the direction of the current in the first electromagnet 81 is changed, the first electromagnet 81 changes the magnetism to form the same magnetism as the second electromagnet 82, at this time, the first electromagnet 81 and the second electromagnet 82 repel each other, the filler pressing plate 45 rotates around the rotating shaft 44 to form a vertical placement state, at this time, the filler pressing plate 45 protrudes from the bottom of the pressing plate frame 41, then the driving motor 7 starts to work, the driving motor 7 drives the electric control telescopic rod 6 and the filler pressing plate 45 to rotate, the filler pressing plate 45 in the vertical state can flatten the filler medium 3 stacked on the filler supporting plate 2, the filler pressing plate 45 can rotate multiple times to ensure the flattening effect, and can gradually flatten by gradually descending, that is, the electric control telescopic rod 6 is synchronous or intermittent in descending and rotating, then the electric control telescopic rod 6 drives the filler pressing plate 4 to move upward to the above of the feeding port 12, then the staff carries out the second filling treatment, after the second filling treatment is completed, the electric control telescopic rod 6 drives the filler pressing plate 4 to move to the above of the filler medium 3, and repeats the above working steps to continue to flatten the filler medium 3, through multiple filling and multiple flattening of the filler medium 3, the filling treatment of the filler medium 3 in the inside of the washing and purifying tower 1 is completed, finally, after the filling treatment of the filler medium 3 is completed, the electric control telescopic rod 6 drives the filler pressing plate 4 to move upward to pass the position of the position sensor 83 again, the position sensor 83 sends a signal, the direction of the current in the first electromagnet 81 is changed again, the first electromagnet 81 changes the magnetism to form the magnetism opposite to the second electromagnet 82, at this time, the first electromagnet 81 and the second electromagnet 82 attract each other, the filler pressing plate 45 rotates around the rotating shaft 44 to form a horizontal placement state, then the electric control telescopic rod 6 drives the filler pressing plate 4 to press on the top of the filler medium 3 to complete the compaction treatment of the filler medium 3, and waits for subsequent mass transfer treatment of gas and liquid, with the movement of the filler pressing plate 45, the filler pressing plate 45 flattens the filler medium 3,The filler medium 3 on the top of the filler layer becomes relatively flat, and after each feeding, multiple such reciprocating movements can not only ensure that the filler medium 3 in the filler layer is relatively tightly filled, but also save the energy and time of the staff stacking the filler medium 3.

[0044] It should be noted that through the stirring of the stirring pressure plate 45, the filler medium 3 on the top of the filler layer can only form a relatively uniform state (that is, it is avoided that one side of the filler medium 3 is excessively stacked to form a state similar to a slope), and the height of the filler medium 3 on the top of the filler layer is uneven, but in the present embodiment, the upper pressure plate 42 and the stirring pressure plate 45 are both made of rubber material, when the filler pressure plate 4 is pressed on the top of the filler medium 3, the bottom surface of the upper pressure plate 42 and the stirring pressure plate 45 is deformed to adapt to the fixation of the filler medium 3 on the top of the filler layer.

[0045] Preferably, in the present embodiment, when the material pushing plate 45 is pushing the filler medium 3, the first electromagnet 81 and the second electromagnet 82 are both in the energized state, at this time, the first electromagnet 81 and the second electromagnet 82 form a repulsive state, at this time, when the driving motor 7 drives the electric control telescopic rod 6 to rotate the material pushing plate 45 to push the filler medium 3, the pushing force direction of the filler medium 3 to the material pushing plate 45 drives the material pushing plate 45 to deflect towards the first electromagnet 81, at this time, under the action of the first electromagnet 81 and the second electromagnet 82 with the same polarity, as the material pushing plate 45 gradually approaches the first electromagnet 81, the resistance of the material pushing plate 45 is also greater, so that the material pushing plate 45 can deflect by a certain angle, at this time, the pushing method of the material pushing plate 45 to the filler medium 3 is a flexible pushing method, compared with the rigid pushing method in the above (the pushing force direction of the filler medium 3 to the material pushing plate 45 is consistent with the rotating direction of the material pushing plate 45, until the material pushing plate 45 is blocked by the limiting baffle, limiting the material pushing plate 45 to continue to deflect), the flexible pushing method can avoid the filler medium 3 from being broken due to the pushing of the material pushing plate 45, and ensure the integrity of the filler medium 3, after completing the pushing process of the last layer of filler medium 3, remotely control the first electromagnet 81 to switch polarity, the first electromagnet 81 and the second electromagnet 82 form opposite magnetic properties, at this time, the electric control telescopic rod 6 drives the filler pressing plate 4 to move downward, the filler medium 3 extrudes the material pushing plate 45, the material pushing plate 45 rotates around the rotating shaft 44, the material pushing plate 45 deflects towards the first electromagnet 81, the first electromagnet 81 and the second electromagnet 82 attract each other, so that the material pushing plate 45 restores to the horizontal state, when the electric control telescopic rod 6 continues to elongate, until the bottom of the filler pressing plate 4 is pressed on the filler medium 3, the pressing process of the filler medium 3 is completed, waiting for the subsequent gas-liquid exchange process. Obviously, in order to improve the pushing efficiency of the material pushing plate 45, a plurality of material pushing plates 45 can be arranged below the upper pressing plate 42, the plurality of material pushing plates 45 are arranged along the circumference of the upper pressing plate 42, when the material pushing plate 45 rotates under the action of the driving motor 7, the plurality of material pushing plates 45 jointly push the filler medium 3 into the washing and purification tower 1, improving the pushing efficiency of the filler medium 3; moreover, during the process of the material pushing plate 45 from the vertical state to the horizontal state, due to the small magnetic attraction in the vertical state, it may be difficult to reset, and the above-mentioned pushing stroke can also be used to make the material pushing plate 45 first and then be attracted by the magnet, which is more convenient.

[0046] It should be noted that the existing washing and purification tower 1 is in operation, the gas from the bottom of the washing and purification tower 1 enters and moves to the top of the gas flow outlet direction, under the action of upward airflow, the filler medium 3 in the filler layer has a tendency to move upward, especially in the case of high gas speed or load mutation, the upward movement of the filler medium 3 is more obvious, at this time, the filler medium 3 will directly act on the filler pressing plate 4, push the filler pressing plate 4 to move upward, but in order to ensure the stability of the height of the filler layer, avoid the situation that the gas-liquid mass transfer efficiency is reduced due to the disorder of the filler layer, when the pressure sensor 5 detects that the pressure from the filler medium 3 is large, the electric control telescopic rod 6 needs to increase the pressure of the filler pressing plate 4 on the filler medium 3 to offset the increasing pressure from the filler medium 3, at this time, the filler medium 3 in contact with the filler pressing plate 4 at the top of the filler layer is subjected to a larger extrusion force, and is prone to breakage, when the filler medium 3 is broken, the filler medium 3 falls into the gap between the filler medium 3 below, affecting the gas-liquid mass transfer efficiency.

[0047] In order to alleviate the above problems, in another embodiment of the present application, preferably, a plurality of avoiding grooves 46 are formed on the lower end surface of the upper pressing plate 42, and a plurality of first electromagnets 81 correspond to the plurality of avoiding grooves 46 one by one, the first electromagnets 81 are slidingly installed in the avoiding grooves 46, and the first electromagnets 81 and the avoiding grooves 46 are connected through pressure springs 47.

[0048] Specifically, when the pressure spring 47 is not stressed, the pressure spring 47 pushes the first electromagnet 81 to protrude from the avoiding groove 46, when the material pushing plate 45 is horizontally arranged and pressed above the filler layer, the second electromagnet 82 on the material pushing plate 45 and the first electromagnet 81 on the bottom surface of the upper pressing plate 42 are attracted together, at this time, a gap is formed between the material pushing plate 45 and the upper pressing plate 42, which serves as a buffer space, when high gas speed or load mutation is encountered, the filler medium 3 in the filler layer tends to move upward, when the filler medium 3 applies pressure to the material pushing plate 45, the pressure spring 47 connected to the first electromagnet 81 is deformed under stress, at this time, the first electromagnet 81 is received into the avoiding groove 46, at this time, the pressure from the filler medium 3 is eliminated through the deformation of the pressure spring 47, avoiding the pressure from the filler medium 3 directly acting on the filler pressing plate 4, causing the electric control telescopic rod 6 connected to the filler pressing plate 4 to eliminate the pressure from the filler pressing plate 4 through telescoping, thereby avoiding the filler medium 3 in contact with the filler pressing plate 4 from being broken.

[0049] Further, the pressing plate frame 41 is composed of a fixed segment 411 and a movable segment 412 in a ring structure, the fixed segment 411 is fixedly connected with the side wall of the upper pressing plate 42, the fixed segment 411 and the movable segment 412 are both in an arc structure, the outer circular surface of the movable segment 412 is made of rubber material, a passive push rod 413 is connected on the movable segment 412, the passive push rod 413 extends into the avoiding groove 46, an adjusting wedge 414 is arranged on the passive push rod 413, an extruding wedge 415 is arranged on the end of the first electromagnet 81 away from the second electromagnet 82, and the extruding wedge 415 abuts against the surface of the adjusting wedge 414.

[0050] Specifically, when the high air speed or the load mutation working condition is encountered, the filler medium 3 in the filler layer appears the upward trend, the filler medium 3 applies the pressure to the shoveling pressing plate 45, the pressure bearing spring 47 connected with the first electromagnet 81 is deformed under the force, at this time, the first electromagnet 81 is accommodated into the avoiding groove 46, at this time, the pressure from the filler medium 3 is eliminated through the deformation of the pressure bearing spring 47, at the same time, when the first electromagnet 81 is accommodated into the avoiding groove 46, the extruding wedge 415 on the first electromagnet 81 extrudes the adjusting wedge 414 in the avoiding groove 46, under the wedge cooperation, the adjusting wedge 414 moves towards the inner wall of the washing and purifying tower 1 with the passive push rod 413, the passive push rod 413 extrudes the movable segment 412 to the inner wall of the washing and purifying tower 1, the pressure applied by the movable segment 412 to the inner wall of the washing and purifying tower 1 becomes larger, under the reaction force, the power required by the filler pressing plate 4 to move on the inner wall of the washing and purifying tower 1 also becomes stronger, which is equivalent to locking the filler pressing plate 4 at the position, avoiding the displacement of the filler pressing plate 4 under the high air speed or the load mutation working condition, and the situation that the gas-liquid exchange efficiency is reduced.

[0051] In another embodiment of the present application, a method for recovering ammonium bicarbonate from fuel boiler tail gas is provided, which comprises the following steps when recovering ammonium bicarbonate from fuel boiler tail gas by using a device for recovering ammonium bicarbonate from fuel boiler tail gas:

[0052] S1: collecting low-concentration ammonium chloride wastewater generated in the rare earth smelting and separation process and waste gas discharged in a boiler kiln;

[0053] S2: the staff introduces the waste gas and the ammonium chloride wastewater into the washing and purifying tower 1 for countercurrent contact, so that the fine powder and impurities such as sulfur and nitrate in the waste gas enter the water phase, the contacted water phase is discharged into an ammonium chloride wastewater pool for comprehensive recovery, and the purified tail gas is introduced into a synthesis reaction tower;

[0054] S3: using pressure exhaust fan to suck, so that the above purified tail gas from the bottom of the synthetic reaction tower, then, from the side wall of the synthetic reaction tower into the dilute ammonia water, washing water from the top of the tower, according to the dilute ammonia water concentration control washing water flow will be diluted to 1.5-2mol / l, so that the concentration of ammonium bicarbonate solution at the bottom of the tower in 1.5-2mol / l, so that the PH value of 7-9 ammonium bicarbonate saturated liquid from the bottom of the synthetic reaction tower.

[0055] The foregoing merely illustrates some exemplary embodiments of the present application by way of example, it is needless to say that for those skilled in the art, the described embodiments can be modified in various ways without departing from the spirit and scope of the present application. Therefore, the above drawings and descriptions are illustrative in nature, and should not be construed as limiting the scope of the claims of the present application.

Claims

1. An apparatus for recovering ammonium bicarbonate from a fuel boiler tail gas, comprising a washing purification tower, a filler support plate is arranged in the washing purification tower, a filler medium is arranged on the filler support plate, and a filler pressing plate providing extrusion pressure is arranged above the filler medium, characterized in that, The washing purification tower is internally provided with an electric control telescopic rod, the telescopic end of the electric control telescopic rod is connected with the surface of the filler pressing plate, a pressure sensor for detecting extrusion pressure is arranged on the electric control telescopic rod or the filler pressing plate, and the telescopic amplitude of the electric control telescopic rod is controlled based on the value of the extrusion pressure.

2. A device for recovering ammonium bicarbonate from the exhaust gases of fuel boilers according to Claim 1, characterized in that, The filler pressing plate is integrally made of elastic material.

3. A device for recovering ammonium bicarbonate from the exhaust gases of fuel boilers according to claim 2, characterized in that, The electric control telescopic rod is further connected with a driving motor, the driving motor is fixedly installed on the inner wall of the washing purification tower, the driving end of the driving motor is connected with the electric control telescopic rod, and when the electric control telescopic rod drives the filler pressing plate to move up and down, the filler pressing plate is synchronously rotated based on the working of the driving motor.

4. A device for recovering ammonium bicarbonate from the exhaust gases of fuel boilers according to claim 3, characterized in that, The filler pressing plate comprises a pressing plate frame, the pressing plate frame is fixedly installed with an upper pressing plate, the upper pressing plate is connected with the telescopic end of the electric control telescopic rod, a plurality of passages for passing gas and liquid are uniformly formed in the upper pressing plate, a material stirring pressing plate is rotatably installed on the lower end surface of the upper pressing plate through a rotating shaft, and a limiting baffle is further arranged on the lower end surface of the upper pressing plate, and the limiting baffle is used for limiting the rotating angle of the material stirring pressing plate.

5. A device for recovering ammonium bicarbonate from the exhaust gases of fuel boilers according to claim 4, characterized in that, The material stirring pressing plate has horizontal and vertical two placing states, when the material stirring pressing plate is horizontally placed, the bottom surface of the material stirring pressing plate is flush with the bottom surface of the pressing plate frame, and when the material stirring pressing plate is vertically placed, the material stirring pressing plate protrudes from the bottom surface of the pressing plate frame.

6. A device for recovering ammonium bicarbonate from the exhaust gases of fuel boilers according to claim 4, characterized in that, The inner wall of the washing purification tower is further provided with an adjusting part, and the adjusting part is used for adjusting the switching of the material stirring pressing plate between the above two states.

7. A device for recovering ammonium bicarbonate from the exhaust gases of fuel boilers according to claim 6, characterized in that, The adjusting part comprises a first electromagnet, a second electromagnet and a position sensor installed on the inner wall of the washing purification tower, the first electromagnet is installed on the bottom surface of the upper pressing plate, and the second electromagnet is installed on the surface of the material stirring pressing plate close to the first electromagnet.

8. A device for recovering ammonium bicarbonate from the exhaust gases of fuel boilers according to claim 7, characterized in that, A plurality of avoiding grooves are formed in the lower end surface of the upper pressing plate, the plurality of avoiding grooves correspond to the plurality of first electromagnets one by one, the first electromagnets are slidingly installed in the avoiding grooves, and the first electromagnets and the avoiding grooves are connected through pressure bearing springs.

9. A device for recovering ammonium bicarbonate from the exhaust gases of fuel boilers according to claim 8, characterized in that, The pressing plate frame has a fixed segment and a movable segment, and the fixed segment and the movable segment form an annular structure, the fixed segment is fixedly connected with the side wall of the upper pressing plate, the fixed segment and the movable segment have an arc structure, the outer circular surface of the movable segment is made of rubber material, a passive push rod is connected to the movable segment, the passive push rod extends into the avoiding groove, an adjusting wedge is arranged on the passive push rod, an extrusion wedge is arranged on the end of the first electromagnet away from the second electromagnet, and the extrusion wedge abuts against the surface of the adjusting wedge.

10. A method of recovering ammonium bicarbonate from a fuel boiler exhaust gas, characterized by, The device for recovering ammonium bicarbonate from fuel boiler tail gas according to any one of claims 1-9 comprises the following steps when recovering ammonium bicarbonate from fuel boiler tail gas: S1: collecting low-concentration ammonium chloride wastewater generated in the rare earth smelting and separation process and waste gas discharged in a boiler kiln; S2: The workers will exhaust gas and ammonium chloride wastewater into the washing purification tower for countercurrent contact, so that the micro powder and sulfur, nitrate impurities in the exhaust gas into the water phase, the water phase after contact into the ammonium chloride wastewater pool comprehensive recovery, the purified tail gas into the synthesis reaction tower; S3: Using pressure suction fan suction, so that the above-mentioned purified tail gas from the bottom of the synthesis reaction tower, then, from the side wall of the synthesis reaction tower into the dilute ammonia water, washing water from the top into, according to the dilute ammonia water feed concentration control washing water flow will dilute ammonia water to 1.5-2mol / l, so that the ammonium bicarbonate solution concentration of 1.5-2mol / l out of the bottom of the tower, so that the PH value of 7-9 ammonium bicarbonate saturated liquid from the bottom of the synthesis reaction tower.

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