A multi-stage separation and purification device for field straw combustion flue gas

Abstract

The present application relates to the field of waste gas purification technology, and discloses a multi-stage separation and purification device for field straw combustion flue gas, which comprises a frame body, a closed cover, a combustion cavity arranged in the rolling net, a treatment device for absorbing the flue gas generated by straw combustion and separating and purifying the flue gas, a fan, an air outlet sleeve connected to the fan, and a guide pipe connected to the fan. The multi-stage separation and purification device for field straw combustion flue gas comprises a water tank water solution absorption unit, an activated carbon and harmful impurity absorption filter screen at the rear end of the guide pipe and other multi-stage treatment units, so that the solid particles, water-soluble harmful substances and residual odors in the flue gas generated by straw combustion can be gradually separated and purified, the flue gas treatment effect is significantly improved, and the pollution to the atmospheric environment is reduced. The relative frame drives the small piston to reciprocate in the piston sleeve, generates a pumping action, automatically draws the water solution from the water channel around the field into the water tank, and reduces the manual water changing operation.

Description

Technical Field

[0001] This invention relates to the field of waste gas purification technology, specifically a multi-stage separation and purification device for flue gas from straw combustion in the field. Background Technology

[0002] Burning straw in the fields is a common waste disposal method in agricultural production. Although comprehensive utilization technologies such as straw return to the field and biomass power generation have been promoted in recent years, in some areas, due to factors such as cost, terrain, and operational efficiency, on-site burning in the fields still exists to a certain extent. Straw burning produces a large amount of smoke containing pollutants such as particulate matter (e.g., PM2.5, PM10), carbon monoxide, nitrogen oxides, volatile organic compounds, and small amounts of sulfides, which have adverse effects on the atmospheric environment and human health.

[0003] Currently, there is a lack of efficient, portable, and low-cost purification devices for treating flue gas from straw burning in fields. Existing flue gas treatment equipment is mostly designed for stationary pollution sources (such as coal-fired boilers and waste incinerators), resulting in large size, high energy consumption, and complex structures, making it difficult to adapt to mobile, dispersed, and power-deprived or limited-power operating environments in the fields. Some smaller devices only use simple filtration or water spraying methods, which suffer from low purification efficiency, high water consumption, easy filter clogging, and inability to achieve continuous operation. Therefore, a multi-stage separation and purification device for flue gas from straw burning in fields is proposed to address the aforementioned problems. Summary of the Invention

[0004] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a multi-stage separation and purification device for flue gas from straw burning in the field, which solves the problem that the flue gas generated during straw burning in the field is difficult to treat and pollutes the surrounding environment.

[0005] Technical solution

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage separation and purification device for field straw combustion flue gas, comprising a frame; a closed hood; a rolling screen, the interior of which is provided with a combustion chamber; a processing device for absorbing and separating the flue gas from straw combustion; a blower connected to an outlet sleeve, the outlet sleeve containing a re-purification component; the re-purification component comprising a fine filter layer and a precious metal coated activated carbon mesh layer. A guide pipe is also connected to the blower, and the guide pipe is connected to the processing device; the processing device includes a pressure element and a separation element; the pressure element is connected to the output shaft of the blower, and the pressure element generates a cyclic reciprocating suction action to draw the flue gas from straw combustion into the separation element for separation; the separation element includes a water tank containing an aqueous solution, a pusher pipe connected to the water tank, one end of the pusher pipe extending into the aqueous solution in the water tank, the other end of the pusher pipe connected to a cylinder liner, and a push sleeve connected to the left end of the cylinder liner.

[0007] Preferably, the live pressure component includes a speed reducer, the output shaft of the blower is connected to the speed reducer, a rotating shaft is connected to the output shaft of the speed reducer, an inclined groove is provided on the rotating shaft, a bracket is slidably connected to the rotating shaft, a sliding pin is provided inside the bracket, the sliding pin is slidably connected inside the inclined groove, a pressure rod is connected to the bracket, a large piston is connected to the end face of the pressure rod, and the large piston is slidably connected inside the cylinder liner.

[0008] Preferably, a forward sliding plate is connected to the bracket, a central gear is engaged on the forward sliding plate, the central gear is rotatably connected to the frame body, a reverse sliding plate is engaged on the other side of the central gear, a opposing frame is connected to the reverse sliding plate, the opposing frame is slidably connected to the rotating shaft, and a large piston is also connected to the left end of the reverse sliding plate, the large piston is slidably connected to another cylinder liner.

[0009] Preferably, multiple inclined grooves are provided, and the multiple inclined grooves are arranged around the rotating shaft, forming multiple sets of V-shaped interconnected grooves.

[0010] Preferably, a scraper is connected to the rotating shaft, and a filter screen is connected to the end face of the conical sleeve. During the rotation of the scraper, the scraper can scrape off the impurities adsorbed on the surface of the filter screen.

[0011] Preferably, the side of the water tank is connected to an inlet pipe and an outlet pipe. One end of the inlet pipe extends into the irrigation ditch around the straw field, and one end of the outlet pipe is located in the straw field or downstream of the straw field irrigation ditch.

[0012] Preferably, a piston sleeve is connected to the water inlet pipe via a pipeline, a small piston is slidably connected inside the piston sleeve, a connecting branch pipe is connected to the small piston, and the connecting branch pipe is connected to the opposite frame.

[0013] Preferably, the water inlet pipe is equipped with a valve, and two one-way valves are installed inside the water inlet pipe. The piston sleeve is located between the two one-way valves, and one-way valves are also installed inside the cone sleeve and the air thrust pipe.

[0014] Preferably, a lever is connected to the rotating shaft, multiple sets of filter holes are provided on the rolling screen, two top plates are provided on the rolling screen, and the lever abuts against the top plates.

[0015] Beneficial effects

[0016] Compared with the prior art, the present invention provides a multi-stage separation and purification device for flue gas from straw combustion in the field, which has the following beneficial effects: 1. This multi-stage separation and purification device for field straw combustion flue gas utilizes multiple treatment units, including an aqueous solution absorption tank, activated carbon at the rear of the guide pipe, and a harmful impurity absorption filter, to progressively separate and purify solid particles, water-soluble harmful substances, and residual odors in the straw combustion flue gas. This significantly improves flue gas treatment efficiency and reduces atmospheric pollution. A relative frame drives a small piston to reciprocate within a piston sleeve, generating a pumping action that automatically draws aqueous solution from the surrounding irrigation ditches into the water tank. Simultaneously, excess aqueous solution is discharged to the field or downstream of the irrigation ditch through a drain pipe, ensuring continuous replacement of the aqueous solution in the tank, maintaining absorption efficiency, and reducing manual water changing operations.

[0017] 2. This multi-stage separation and purification device for flue gas from straw combustion in the field utilizes a rotating shaft that drives scrapers to continuously scrape away impurities from the surface of the filter screen at the end of the cone sleeve. This promptly removes adsorbed impurities, prevents filter clogging, ensures unobstructed flue gas extraction channels, reduces maintenance frequency, and is suitable for long-term continuous operation in the field. A lever on the rotating shaft works in conjunction with the top plate on the rolling screen to drive the rolling screen in both forward and reverse directions, intermittently turning over the burning straw inside. This improves the contact conditions between the straw and oxygen, promotes complete combustion, and reduces black smoke and harmful gases produced by incomplete combustion. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a multi-stage separation and purification device for field straw combustion flue gas proposed in this invention; Figure 2 This is a schematic diagram of the treatment device structure of a multi-stage separation and purification device for flue gas from straw combustion in the field, as proposed in this invention. Figure 3 This is a schematic diagram of the active pressure component structure of a multi-stage separation and purification device for field straw combustion flue gas proposed in this invention; Figure 4 This is a schematic diagram of the connection structure between the inlet and outlet pipes of a multi-stage separation and purification device for field straw combustion flue gas proposed in this invention. Figure 5 This is a schematic diagram of the four cylinder liner connection structure of a multi-stage separation and purification device for field straw combustion flue gas proposed in this invention; Figure 6 This is a schematic diagram of the rolling screen structure of a multi-stage separation and purification device for flue gas from straw combustion in the field, as proposed in this invention.

[0019] In the diagram: 1. Frame; 2. Enclosed hood; 3. Air outlet sleeve; 4. Fan; 5. Processing device; 501. Reducer; 502. Rotating shaft; 503. Live pressure component; 5031. Pressure rod; 5032. Large piston; 5033. Support; 5034. Inclined groove; 5035. Reverse sliding plate; 5036. Center gear; 5037. Forward sliding plate; 5038. Opposite frame; 504. Cone sleeve; 505. Air thrust pipe; 506. Cylinder liner; 507. Water tank; 508. Water inlet pipe; 509. Drain pipe; 510. Connecting branch pipe; 511. Piston sleeve; 512. Valve; 6. Guide pipe; 7. Roller screen; 701. Scraper; 702. Top plate; 703. Paddle bar. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-6 A multi-stage separation and purification device for field straw combustion flue gas includes a frame 1; a closed cover 2; a rolling screen 7, the inside of which is provided with a combustion chamber; a treatment device 5, used to absorb the flue gas from straw combustion and separate and purify it; and a blower 4, on which an exhaust sleeve 3 is connected.

[0022] The exhaust sleeve 3 is internally equipped with a re-purification component; the re-purification component includes a fine filter layer and a precious metal-coated activated carbon mesh layer. The fine filter layer mainly consists of fine filter mesh structures to filter and separate inhalable particulate matter, while the precious metal-coated activated carbon mesh layer mainly consists of activated carbon filters with precious metal coatings, primarily used for catalytic adsorption and decomposition of toxic and organic pollutants.

[0023] The blower 4 is also connected to a guide pipe 6, which is connected to the processing device 5. The processing device 5 includes a pressure member 503 and a separator. The pressure member 503 is connected to the output shaft of the blower 4. The pressure member 503 generates a cyclical suction action to draw the flue gas from the straw combustion into the separator for separation.

[0024] In this embodiment, the separating component includes a water tank 507, which contains an aqueous solution. A push pipe 505 is connected to the water tank 507. One end of the push pipe 505 extends into the aqueous solution inside the water tank 507, and the other end of the push pipe 505 is connected to a cylinder liner 506. A cone sleeve 504 is connected to the left end of the cylinder liner 506.

[0025] Furthermore, the live pressure component 503 includes a reducer 501. The output shaft of the blower 4 is connected to the reducer 501. A rotating shaft 502 is connected to the output shaft of the reducer 501. The rotating shaft 502 has an inclined groove 5034. A bracket 5033 is slidably connected to the rotating shaft 502. A sliding pin is provided inside the bracket 5033 and is slidably connected inside the inclined groove 5034. A pressure rod 5031 is connected to the bracket 5033. A large piston 5032 is connected to the end face of the pressure rod 5031 and is slidably connected inside the cylinder liner 506. The rotational power output by the blower 4 is reduced by the reducer 501 and output to the subsequent mechanism at a lower speed, thereby controlling the reciprocating frequency of the live pressure component 503 to match the flue gas generation rate. The rotating shaft 502 is connected to the output shaft of the reducer 501, and an inclined groove 5034 is formed along its outer peripheral wall. A bracket 5033 is slidably connected to the rotating shaft 502. The bracket 5033 can slide freely along the axial direction of the rotating shaft 502. A sliding pin is fixedly installed inside the bracket 5033, and this sliding pin is slidably connected inside the inclined groove 5034. When the rotating shaft 502 rotates, the inclined groove 5034 rotates accordingly. Through the cooperation of the sliding pin and the inclined surface of the inclined groove 5034, the rotational motion is converted into the reciprocating linear motion of the bracket 5033 along the axial direction of the rotating shaft 502. A pressure rod 5031 is fixedly connected to the bracket 5033. A large piston 5032 is connected to the end face of the pressure rod 5031. The large piston 5032 is slidably and sealingly connected inside the cylinder liner 506. When the bracket 5033 drives the pressure rod 5031 and the large piston 5032 to move reciprocally, the large piston 5032 alternately performs suction and exhaust actions inside the cylinder liner 506, thereby realizing the suction and push of flue gas and guiding it into the separator for purification treatment.

[0026] Furthermore, a forward sliding plate 5037 is connected to the bracket 5033, and a central gear 5036 is meshed on the forward sliding plate 5037. The central gear 5036 is rotatably connected inside the frame 1. A reverse sliding plate 5035 is meshed on the other side of the central gear 5036. A relative frame 5038 is connected to the reverse sliding plate 5035. The relative frame 5038 is slidably connected to the rotating shaft 502. A large piston 5032 is also connected to the left end of the reverse sliding plate 5035. The large piston 5032 is slidably connected inside another cylinder liner 506.

[0027] Furthermore, multiple inclined grooves 5034 are provided, and these multiple inclined grooves 5034 are arranged around the rotating shaft 502, forming multiple sets of V-shaped interlocking grooves. A scraper 701 is connected to the rotating shaft 502, and a filter screen is connected to the end face of the conical sleeve 504. During rotation, the scraper 701 can scrape off impurities adsorbed on the surface of the filter screen. Multiple inclined grooves 5034 are connected end to end in sequence to form multiple sets of V-shaped interlocking grooves. Specifically, two adjacent inclined grooves 5034 are arranged at a certain angle in both the axial and circumferential directions of the rotating shaft 502, forming a V-shaped or herringbone pattern. When the sliding pin slides in the interlocking grooves, with the continuous rotation of the rotating shaft 502, the sliding pin passes through each inclined groove 5034 in sequence, thereby driving the bracket 5033 to reciprocate along the axial direction of the rotating shaft 502. Because the interlocking groove is composed of multiple sets of V-shaped structures, the sliding pin completes a full forward and backward stroke within each set of V-shaped grooves, enabling the support 5033 to achieve multiple reciprocating movements within one rotation cycle. This increases the frequency of the large piston 5032's reciprocating movement within the cylinder liner 506, enhancing the continuity of flue gas suction and delivery. The scraper 701 rotates synchronously with the rotating shaft 502. A filter screen is connected to the end face of the cone sleeve 504, facing the roller screen 7 or the flue gas inlet. This filter screen is used to intercept large particulate impurities in the flue gas, preventing them from entering the cylinder liner 506 and causing wear or blockage. During rotation, one end or edge of the scraper 701 maintains contact or a small gap with the filter screen surface, continuously scraping away impurities adsorbed and accumulated on the filter screen surface. This prevents the filter screen from becoming clogged due to impurity accumulation, keeping the flue gas passage unobstructed. The scraped-off impurities can fall into the collection area at the bottom of the roller screen 7 or the frame 1 for easy subsequent cleaning.

[0028] In addition, the water tank 507 has an inlet pipe 508 and a drain pipe 509 connected to its side. One end of the inlet pipe 508 extends into the irrigation ditch surrounding the straw field, and one end of the drain pipe 509 is located inside the straw field or downstream of the irrigation ditch. A piston sleeve 511 is connected to the inlet pipe 508 via a pipe. A small piston is slidably connected inside the piston sleeve 511, and a connecting branch pipe 510 is connected to the small piston. The connecting branch pipe 510 is connected to the opposing frame 5038. To achieve automatic replenishment of the aqueous solution, the piston sleeve 511 is connected to the inlet pipe 508 via a branch pipe. A small piston is slidably and sealingly connected inside the piston sleeve 511. The small piston can reciprocate within the piston sleeve 511, thereby generating a pumping action. The connecting branch pipe 510 is connected to the small piston, and the other end of the connecting branch pipe 510 is fixedly connected to the opposing frame 5038. As the opposing frame 5038 reciprocates with the reverse sliding plate 5035, the connecting branch pipe 510 drives the small piston to reciprocate synchronously within the piston sleeve 511, creating a continuous pumping action. During the reciprocating motion of the small piston, the piston sleeve 511 alternately generates negative and positive pressures, thereby drawing the aqueous solution from the water channel into the piston sleeve 511 through the inlet pipe 508, and then pressing it into the water tank 507, achieving automatic water replenishment of the water tank 507. Simultaneously, excess dust-laden wastewater in the water tank 507 automatically overflows and is discharged from the drain pipe 509 under the continuous water replenishment, forming a dynamic water circulation system. This ensures the continuous absorption capacity of the aqueous solution in the water tank 507 for solid particles and water-soluble harmful substances in the flue gas, eliminating the need for frequent manual water changes, thus improving the automation level of the equipment and the convenience of field operations.

[0029] It is worth noting that a valve 512 is installed on the water inlet pipe 508, and two one-way valves are installed inside the water inlet pipe 508. A piston sleeve 511 is located between the two one-way valves. One-way valves are also installed inside the cone sleeve 504 and the air push pipe 505. The valve 512 can be used to manually or automatically control the opening and closing of the water inlet pipe, facilitating the shut-off of the water supply during equipment startup, shutdown, or maintenance to prevent backflow or leakage of the aqueous solution. Simultaneously, the two one-way valves inside the water inlet pipe 508 are installed in the same direction, both allowing the aqueous solution to flow from the channel side to the water tank 507 side, while blocking it from flowing in the opposite direction. The piston sleeve 511 is connected to the water inlet pipe 508 via a branch pipe, and is located between the two one-way valves. When the small piston reciprocates within the piston sleeve 511: During the suction stroke, the first one-way valve on the side closer to the water channel opens, and the second one-way valve on the side farther from the water channel closes, allowing the aqueous solution to be drawn from the water channel into the piston sleeve 511; during the discharge stroke, the first one-way valve closes, and the second one-way valve opens, allowing the aqueous solution within the piston sleeve 511 to be forced into the water tank 507. The two one-way valves, in conjunction with the small piston, form a complete plunger pump structure, ensuring that the aqueous solution can only be replenished unidirectionally and quantitatively from the water channel to the water tank, preventing backflow and thus achieving a stable automatic water replenishment function. The one-way valve within the cone sleeve 504 allows flue gas to flow unidirectionally from the intake end of the cone sleeve 504 near the filter screen into the cylinder liner 506, preventing the large piston 5032 within the cylinder liner 506 from pushing the flue gas back into the intake port of the cone sleeve 504 during the compression stroke. The one-way valve inside the thrust pipe 505 allows flue gas to flow unidirectionally from the cylinder liner 506 to the aqueous solution inside the water tank 507, preventing the aqueous solution in the water tank 507 from flowing back into the cylinder liner 506 during the suction stroke of the large piston 5032. By setting one-way valves at the above-mentioned key locations, the unidirectional and orderly flow of flue gas in the system is ensured, effectively avoiding problems such as flue gas backflow, crossflow, and backflow of aqueous solution, thus ensuring the stability and reliability of the multi-stage separation and purification process of flue gas.

[0030] It is worth noting that a lever 703 is connected to the rotating shaft 502, and the rolling screen 7 is provided with multiple sets of filter holes. Two top plates 702 are also provided on the rolling screen 7, with the lever 703 abutting against the top plates 702. The rolling screen 7 has a cylindrical or cage-like structure, with multiple sets of filter holes on its circumferential walls. These holes allow air to enter the combustion chamber to maintain straw combustion while simultaneously allowing flue gas to escape from the inside of the rolling screen 7, facilitating subsequent extraction and collection. Two top plates 702 are located on the inner wall or at the end of the rolling screen 7, and these two top plates 702 are distributed at a certain angle in the circumferential direction of the rolling screen 7, for example, opposite each other or spaced at a certain angle. The rotating shaft 502 is connected to the lever 703, and the entire rotating shaft 502 is located on one side of the rolling net 7. The rotation of the rotating shaft 502 controls the rotation of the lever 703, and its free end successively abuts against the surfaces of the two top plates 702. Through the continuous rotation of the lever 703, the two top plates 702 are alternately pushed, thereby driving the rolling net 7 to rotate a certain angle in one direction. After the lever 703 passes the top plate 702, the rolling net 7 swings back in the opposite direction or continues to rotate under the inertia or the contact between the lever 703 and the other top plate 702, forming an alternating forward and reverse motion. This keeps the straw inside the rolling net 7 constantly turned and loosened during combustion, preventing straw accumulation and incomplete combustion. The turning action can improve the contact conditions between the straw and air, promote the uniform distribution of oxygen, improve combustion efficiency, and reduce pollutants such as black smoke, carbon monoxide, and unburned carbon particles produced by oxygen-deficient combustion. Meanwhile, the rotation of the roller screen 7 also helps the ash formed by combustion to fall naturally from the filter holes, preventing ash from accumulating on the surface of the straw and hindering combustion, further ensuring the continuity and completeness of combustion, reducing the amount of harmful substances generated in the flue gas from the source, and improving the overall purification effect.

[0031] Working principle: First, when using the equipment, the entire device can be placed in the field. Casters can be installed at the bottom of the device, or a moving mechanism can be used to control the position of the entire frame 1. Then, the straw from the field is collected and placed inside the rolling net 7, and ignited. Afterwards, the blower 4 is turned on. A rotating shaft extends from inside the blower 4 and is connected to the reducer 501. The reducer 501 reduces the speed of the blower 4, thereby controlling the reduced rotation of the rotating shaft 502. As the rotating shaft 502 rotates, it causes the sliding pin inside the support 5033 to slide within the inclined groove 5034, thus causing the support 5033 to reciprocate left and right on the rotating shaft 502. Because the inclined groove 5034 continuously forms multiple sets of V-shaped sliding grooves, the support 5033 reciprocates left and right. The movement of the piston causes the large piston 5032 on the pressure rod 5031 to move inside the cylinder liner 506. When the large piston 5032 moves to the right, it generates a suction force, drawing the flue gas from the straw combustion into the cylinder liner 506 through the opening of the cone sleeve 504. Then, when the large piston 5032 moves to the left, it forces the flue gas from inside the cylinder liner 506 through the thrust sleeve 505 into the water tank 507, where it comes into full contact with the aqueous solution inside the water tank 507. The aqueous solution absorbs and precipitates the solid particles in the flue gas, and the separated gas is then discharged and enters through the opening at the top. Inside the guide pipe 6, the suction force generated by the fan 4 acts on the guide pipe 6, which is connected to the exhaust sleeve 3. Therefore, the separated gas will be discharged upwards from the exhaust sleeve 3. The exhaust sleeve 3 is equipped with an activated carbon filter for odor absorption and multiple sets of filters for absorbing harmful impurities. Substances that cannot be dissolved by the aqueous solution are absorbed by the other filters before being discharged. Because most of the burned straw remains as solid particles, the dissolution and precipitation in the aqueous solution can effectively separate most of the substances in the flue gas. Meanwhile, in the support 5033... During reciprocating motion, the forward sliding plate 5037 connected to it drives the central gear 5036 to rotate. The central gear 5036 drives the reverse sliding plate 5035 on the other side to move relative to each other, which in turn drives the other two sets of large pistons 5032 to slide inside the cylinder liner 506. The entire piston action is set in four sets, with two pairs forming a group. To ensure continuity, when one set of pistons is drawing in, the other set is performing the exhaust action, always keeping the other set in the extraction stage to avoid the accumulation of flue gas during combustion. There is always an extraction action to draw in the gas.Simultaneously, during the relative movement of the frame 5038, the connecting branch pipe 510 drives the small piston to perform piston action. The small piston moves inside the piston sleeve 511, generating a pumping action, that is, generating suction force to pump water from the water channel and then pressurize the water into the water tank 507. Therefore, the water tank 507 continuously receives water, thus achieving water exchange. Excess water is discharged outward from the drain pipe 509. Because the height of the drain pipe 509 is higher than that of the inlet pipe 508, the excess water is discharged from the drain pipe 509 in a manner similar to water overflow. The exchanged water can be directly connected to the downstream of the water channel or directly irrigated in the fields, depending on the operator's needs. At the same time, when the rotating shaft 502 rotates, it will drive the scraper 701 to rotate, thereby contacting the filter screen surface on the cone sleeve 504, scraping off the impurities attached to the filter screen surface, ensuring the permeability of the cone sleeve 504. At the same time, the rotation of the rotating shaft 502 will also drive the lever 703 to rotate between the two top plates 702. By using the action of abutting and lifting, it will drive the rolling net 7 to rotate forward and backward, thereby turning over the straw placed inside to ensure complete combustion.

[0032] In summary, this device transforms the traditional exhaust fan or blower method into a piston-type suction action, achieving slow, pressure-driven suction followed by high-pressure bubbling to improve water washing efficiency. Traditional exhaust fans directly blow flue gas into water, resulting in excessively high airflow speeds and short gas-liquid contact time, limiting the absorption or effectiveness of the aqueous solution on particulate matter. In contrast, this device forces flue gas into the cylinder liner 506, where it is then smoothly pushed into the water tank by the piston. This slow in-and-out process allows the flue gas to form microbubbles in the water and remain there for an extended period, increasing the gas-liquid contact area and time, thus making the water washing dust removal efficiency higher than that of traditional blowers. Furthermore, in open combustion environments like fields, traditional blowers suffer from unstable negative pressure, easily affected by external winds, causing flue gas to overflow from the combustion chamber. This device utilizes a multi-piston suction structure, with multiple units forming a group, achieving alternating suction and exhaust, ensuring at least one unit is always in suction mode, thus creating a stable negative pressure environment and guaranteeing that the flue gas can be processed.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A multi-stage separation and purification device for flue gas from straw combustion in the field, characterized in that, include: Frame (1); Enclosed cover (2); Rolling mesh (7), the interior of which is provided with a combustion chamber; The processing device (5) is used to absorb the flue gas from straw combustion and to separate and purify it; A blower (4) is connected to an air outlet sleeve (3), and a guide pipe (6) is also connected to the blower (4). The guide pipe (6) is connected to the processing device (5), and a re-purification component is provided inside the air outlet sleeve (3). The re-purification component includes a fine filter layer and a precious metal coated activated carbon mesh layer; The processing device (5) includes a pressing component (503) and a separating component; The live pressure component (503) is connected to the output shaft of the fan (4). The live pressure component (503) generates a cyclical suction action to draw the flue gas from the straw combustion into the separator for separation. The separating component includes a water tank (507), the interior of which is filled with an aqueous solution. A push pipe (505) is connected to the water tank (507), one end of which extends into the aqueous solution inside the water tank (507), and the other end of which is connected to a cylinder liner (506). A cone sleeve (504) is connected to the left end of the cylinder liner (506). The live pressure component (503) includes a speed reducer (501), the output shaft of the fan (4) is connected to the speed reducer (501), a rotating shaft (502) is connected to the output shaft of the speed reducer (501), an inclined groove (5034) is provided on the rotating shaft (502), a bracket (5033) is slidably connected to the rotating shaft (502), a sliding pin is provided inside the bracket (5033), the sliding pin is slidably connected inside the inclined groove (5034), a pressure rod (5031) is connected to the bracket (5033), a large piston (5032) is connected to the end face of the pressure rod (5031), and the large piston (5032) is slidably connected inside the cylinder liner (506).

2. The multi-stage separation and purification device for field straw combustion flue gas according to claim 1, characterized in that: A forward sliding plate (5037) is connected to the bracket (5033), and a central gear (5036) is meshed on the forward sliding plate (5037). The central gear (5036) is rotatably connected inside the frame (1). A reverse sliding plate (5035) is meshed on the other side of the central gear (5036). A relative frame (5038) is connected to the reverse sliding plate (5035), and the relative frame (5038) is slidably connected to the rotating shaft (502). A large piston (5032) is also connected to the left end of the reverse sliding plate (5035), and the large piston (5032) is slidably connected inside another cylinder liner (506).

3. The multi-stage separation and purification device for field straw combustion flue gas according to claim 2, characterized in that: The inclined groove (5034) is provided in multiple ways, and the multiple inclined grooves (5034) are arranged around the rotating shaft (502), forming multiple sets of V-shaped interconnected grooves.

4. The multi-stage separation and purification device for field straw combustion flue gas according to claim 1, characterized in that: A scraper (701) is connected to the rotating shaft (502), and a filter screen is connected to the end face of the cone sleeve (504). During the rotation of the scraper (701), it can scrape off the impurities adsorbed on the surface of the filter screen.

5. A multi-stage separation and purification device for flue gas from straw combustion in the field according to claim 3, characterized in that: The water tank (507) is connected to an inlet pipe (508) and a drain pipe (509) on its side. One end of the inlet pipe (508) extends into the irrigation ditch around the straw field, and one end of the drain pipe (509) is located in the straw field or downstream of the straw field irrigation ditch.

6. The multi-stage separation and purification device for flue gas from straw combustion in the field according to claim 5, characterized in that: A piston sleeve (511) is connected to the water inlet pipe (508) via a pipeline. A small piston is slidably connected inside the piston sleeve (511). A connecting branch pipe (510) is connected to the small piston. The connecting branch pipe (510) is connected to the opposing frame (5038).

7. The multi-stage separation and purification device for field straw combustion flue gas according to claim 6, characterized in that: The water inlet pipe (508) is equipped with a valve (512), and the inside of the water inlet pipe (508) is equipped with two one-way valves. The piston sleeve (511) is located between the two one-way valves. The inside of the cone sleeve (504) and the air push pipe (505) is equipped with one-way valves.

8. The multi-stage separation and purification device for flue gas from straw combustion in the field according to claim 3, characterized in that: A lever (703) is connected to the rotating shaft (502), and multiple sets of filter holes are provided on the rolling screen (7). Two top plates (702) are provided on the rolling screen (7), and the lever (703) abuts against the top plates (702).

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