Biomass boiler flue gas ultra-low emission purification system

Abstract

The invention belongs to the technical field of flue gas purification, and particularly relates to a biomass boiler flue gas ultra-low emission purification system which comprises a conveying module, a purification module, an emission detection module and a control module, the purification module comprises a desulfurization tower, and flue gas is desulfurized through the desulfurization tower; the desulfurizing tower comprises spraying pipelines, the spraying pipelines are uniformly arranged in the desulfurizing tower, and spraying nozzles are uniformly arranged at the bottoms of the spraying pipelines; the slurry is sprayed from top to bottom, falls down and converges at the bottom of the desulfurization tower; along with the convergence of the slurry, the liquid level of the slurry rises to submerge the flue gas inlet, so that the flue gas is bubbled out from the slurry converged at the bottom of the desulfurization tower; lime slurry is used as conventional slurry for reaction, the slurry contains moisture, and the moisture is in contact with the moisture in the slurry in the bubbling process of the flue gas, so that the effect of washing the flue gas is achieved, impurities in the flue gas are filtered, the cleanliness of the flue gas is improved, the reaction effect is improved, and the flue gas purification effect is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas purification, and specifically relates to an ultra-low emission purification system for flue gas from a biomass boiler. Background Art

[0002] Biomass boilers produce a large amount of flue gas during the combustion process, which contains a large amount of harmful substances, such as sulfur dioxide, nitrogen oxides, particulate matter, etc.; these harmful substances cause great harm to the environment and the environment; the boiler flue gas purification system is mainly composed of the following parts: flue gas collection device, flue gas conveying device, flue gas purification device, flue gas emission device and control system; flue gas treatment equipment includes dust removal equipment, desulfurization equipment, denitrification equipment, etc.; among them, dust removal equipment is an indispensable part of the flue gas purification system; desulfurization equipment is mainly based on desulfurization tower, which is a tower-type equipment for desulfurization of industrial waste gas.

[0003] During the long-term flue gas desulfurization process, the following problems will be encountered: Wear caused by impurities: Flue gas contains a large amount of dust particles, and the impact of high-speed airflow and the scouring of spray liquid will cause wear of the equipment; Blockage and scaling of impurities: Dust particles that are not effectively removed from the flue gas tend to accumulate in the spray device, pipelines and other parts, forming a hard scaling layer, causing blockage and affecting heat transfer and fluid flow; in addition, the precipitation of solid particles such as gypsum and sulfite in the desulfurization absorption liquid will also block the spray nozzles, pipelines, etc. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the present invention proposes an ultra-low emission purification system for biomass boiler flue gas.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: the present invention proposes an ultra-low emission purification system for flue gas from a biomass boiler, comprising a conveying module, a purification module, an emission detection module and a control module, wherein the purification module comprises a desulfurization tower, through which the flue gas is desulfurized; the desulfurization tower comprises: Spray pipes, the spray pipes are evenly arranged in the desulfurization tower, and spray nozzles are evenly arranged at the bottom of the spray pipes; a flue gas inlet is installed at the bottom of one side of the desulfurization tower, a flue gas outlet is installed at the top of one side, and a waste liquid outlet is installed at the bottom of the other side of the desulfurization tower; a circulating liquid device is installed on one side of the desulfurization tower, and the circulating liquid device is connected to the spray pipe for supplying solution to the spray nozzle; A reaction plate, wherein the reaction plate is arranged in the middle part of the desulfurization tower, and a sensor is arranged in the reaction plate, and reaction grooves are evenly opened in the reaction plate, the reaction grooves are annular, the reaction grooves are concentric and arranged with increasing radius, the cross-section of the reaction grooves is stepped, and the top of the reaction grooves faces the center of the desulfurization tower; a rotating rod is connected to the center of the desulfurization tower, and the rotating rod is connected to the driving part at the top of the desulfurization tower, and the rotating rod passes through the center of the reaction plate; a cross bar is provided on the rotating rod, the cross bar is located at the upper and lower parts of the reaction plate, and reaction blocks are evenly arranged on the top of the cross bar, and the reaction blocks are located at the bottom of the reaction plate and slide in the reaction groove; a scraper is provided at one end of the cross bar, and one side of the scraper contacts the inner wall of the desulfurization tower.

[0006] Preferably, a rotating ring is sleeved on the rotating rod, the rotating ring is rotatably connected to the rotating rod, and a No. 1 electric push rod is installed in the rotating rod, and the telescopic end of the No. 1 electric push rod extends out of the inner wall of the rotating rod and engages with the inner wall of the rotating ring; the outer ring of the rotating ring is slidably connected to a soaking box, and the soaking box is located at one side of the rotating ring and rises and falls, and the soaking agent in the soaking box cleans the spray nozzle; the inner wall of the desulfurization tower is provided with a slide groove, and one end of the soaking box slides in the slide groove, the slide groove is arc-shaped near the spray nozzle, and the spray nozzles are arranged in a straight line; A No. 1 pipe is installed in the reaction plate, and the No. 1 pipe is evenly surrounded by the inside of the reaction plate. A part of the No. 1 pipe is located in the reaction plate, and the other part surrounds the inner wall of the desulfurization tower. One end of the No. 1 pipe is located outside the desulfurization tower and is wound around the spray pipe; a circulation pump assembly is installed on the surface of the desulfurization tower, and is used for the circulation of the heat exchange solution in the No. 1 pipe.

[0007] Preferably, a soaking rod is slidably connected to the soaking box through a spring, and the soaking rod contacts the spray nozzle through a cleaning brush arranged on the surface; one end of the soaking rod extends from the top of the soaking box and is located at the bottom of the soaking box, and toggle blocks are evenly arranged on the rotating rod, and one side of the toggle block is an inclined surface, and the inclined surface of the toggle block contacts one end of the soaking rod; a block is slidably connected to the slide groove through a spring, the blocks are evenly distributed, and the blocks are retracted into the inner wall of the desulfurization tower, and the blocks contact one end of the soaking box.

[0008] Preferably, a rotating block is rotatably connected to the soaking rod, and a cleaning brush is arranged on the rotating block, and the rotating block cleans the spray nozzle through the cleaning brush; a driving bar is arranged on the inner wall of the soaking box, and the driving bar is meshed with the rotating block.

[0009] Preferably, comb teeth are installed in the soaking box, and the comb teeth are inserted into the cleaning brush; the cleaning brush is made of a tough material, and the cleaning brush has an annular protrusion near the end.

[0010] Preferably, hydraulic cylinders are evenly arranged at the bottom of the reaction plate and are distributed in a ring. The bottom of the hydraulic cylinder is slidably connected to a hydraulic plug via a spring. The cross section of the hydraulic plug is I-shaped. One end of the hydraulic plug is located in the hydraulic cylinder, and the other end is located at the bottom of the hydraulic cylinder. A hydraulic rod is arranged on the cross bar below the reaction plate, and the top of the hydraulic rod contacts the bottom of the hydraulic plug. A liquid collecting pipe is arranged on one side of the hydraulic cylinder, and the top of the liquid collecting pipe is located at the bottom of the reaction tank, and the bottom is connected to the hydraulic cylinder via a one-way valve. A liquid infusion pipe is installed on the top of the hydraulic cylinder via a one-way valve, and one end of the liquid infusion pipe is located at the top of the reaction tank to transport the reaction slurry toward the bottom of the reaction tank.

[0011] Preferably, filter holes are evenly arranged at one end of the hydraulic plug, and a filter screen is provided at the bottom of the filter hole. A filter plate is hinged to the top of the filter hole through a torsion spring, and the filter plate is engaged with the filter hole.

[0012] Preferably, an airbag is provided at the bottom of the hydraulic cylinder, and the bottom of the airbag is connected to the bottom of the hydraulic plug, and the airbag is located between the bottom of the hydraulic cylinder and the bottom of the hydraulic plug; a suction pipe is provided inside the middle part of the hydraulic plug, and one end of the suction pipe is connected to the airbag, and the other end is located at the bottom of the filter and close to the filter.

[0013] Preferably, the inner wall of the desulfurization tower is evenly provided with guide rings, and the scraper contacts the guide rings.

[0014] Preferably, the guide rings are staggered and distributed with the middle of the desulfurization tower as the reference, with the first guide ring located on one side of the desulfurization tower and the second guide ring located on the other side of the desulfurization tower, and the edge of the reaction plate contacts the guide ring; a No. 2 electric push rod is provided inside the rotating rod, and a driving rod is provided at the telescopic end of the No. 2 electric push rod, one end of the driving rod passes through the bottom of the rotating rod and is located below the rotating rod, and the No. 2 electric push rod is vertically arranged; the reaction plate is slidably connected to the rotating rod, the reaction plate is divided into two by the middle position as the reference, and is symmetrically distributed, and a lifting rod is provided at the bottom of each reaction plate, the end of the lifting rod is annularly sleeved on the driving rod, and a spring is provided between the driving rod and the lifting rod.

[0015] The beneficial effects of the present invention are as follows: 1. In the ultra-low emission purification system for flue gas from a biomass boiler described in the present invention, slurry is sprayed and falls from top to bottom and gathers at the bottom of a desulfurization tower; as the slurry gathers, the liquid level of the slurry rises to submerge the flue gas inlet, so that the flue gas bubbles out from the slurry gathered at the bottom of the desulfurization tower; on the one hand, the slurry is a conventional slurry used for reaction, and the slurry contains water. During the process of the flue gas bubbling out, it comes into contact with the water in the slurry, achieving the effect of washing the flue gas with water, filtering impurities in the flue gas, and avoiding excessive impurities in the flue gas that affect the reaction effect, thereby improving the cleanliness of the flue gas, improving the reaction effect, and further improving the flue gas purification effect.

[0016] 2. In the ultra-low emission purification system for flue gas from a biomass boiler described in the present invention, the slurry sprayed from the spray nozzle falls on the reaction plate, flows through the reaction tank and gathers at the bottom of the desulfurization tower; the flue gas rises and contacts the bottom of the reaction plate, and the flue gas is guided by the stepped reaction tank and converges to the center of the desulfurization tower, so as to avoid the slurry flowing down the inner wall of the desulfurization tower from contacting with the flue gas, and the impurities such as flocs generated by the reaction adhere to the inner wall of the desulfurization tower to form scaling, thereby improving the cleanliness of the inner wall of the desulfurization tower, ensuring that the inner wall of the desulfurization tower is smooth, and improving the purification efficiency of the desulfurization tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 is a stereogram of the present invention; Figure 2 is an internal schematic diagram of the present invention; Figure 3 It is a state diagram of the swivel driving the soaking box to rotate along the chute; Figure 4 This is a schematic diagram of the inside of the soaking box; Figure 5 It is the state diagram of the two reaction boards merged; Figure 6 It is a state diagram of two reaction plates separated by staggered separation; Figure 7 is a cross-sectional view of a reaction plate.

[0019] In the figure: desulfurization tower 1, spray pipe 11, spray nozzle 12, flue gas inlet 13, flue gas outlet 14, waste liquid outlet 15, circulating liquid device 16, reaction plate 2, reaction tank 21, rotating rod 22, driving member 23, cross bar 24, reaction block 25, scraper 26, swivel 27, No. 1 electric push rod 28, soaking box 29, slide 3, No. 1 pipe 31, circulating pump assembly 32, soaking rod 33, cleaning brush 34, toggle block 35, block 36, rotating block 37, driving bar 38, comb teeth 39, hydraulic cylinder 4, hydraulic plug 41, hydraulic rod 42, liquid collecting pipe 43, liquid infusion pipe 44, filter hole 45, filter screen 46, filter plate 47, air bag 48, suction pipe 49, guide ring 5, No. 2 electric push rod 51, driving rod 52, lifting rod 53. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Embodiment 1: In order to effectively solve the above problems, as shown in the accompanying drawings of the specification Figure 1-Figure 7 As shown, it includes a conveying module, a purification module, an emission detection module and a control module, wherein the purification module includes a desulfurization tower 1, through which the flue gas is desulfurized; the conveying module is mainly used to collect the flue gas generated by the boiler and convey it to the purification module for treatment; common smoke hoods, smoke pipes, etc. cooperate with fans to complete the transportation of flue gas; the purification module is mainly responsible for processing the collected flue gas and removing harmful substances therein, and common flue gas purification devices include desulfurization tower 1, denitrification tower, dust collector, etc.; the emission detection module is mainly responsible for detecting the flue gas emitted by the purification module, such as flue gas detection sensors, etc.; the control module is mainly responsible for monitoring and controlling the operation of the entire flue gas purification system to ensure the stable operation of the system, and common control systems include PLC control system, DCS control system, etc.; The desulfurization tower 1 comprises: A spray pipe 11, wherein the spray pipe 11 is evenly arranged in the desulfurization tower 1, and a spray nozzle 12 is evenly arranged at the bottom of the spray pipe 11; a flue gas inlet 13 is installed at the bottom of one side of the desulfurization tower 1, a flue gas outlet 14 is installed at the top of one side, and a waste liquid outlet 15 is installed at the bottom of the other side of the desulfurization tower 1; a circulating liquid device 16 is installed at one side of the desulfurization tower 1, and the circulating liquid device 16 is connected to the spray pipe 11, and is used to supply a solution to the spray nozzle 12; A reaction plate 2, wherein the reaction plate 2 is arranged in the middle of the desulfurization tower 1, and a sensor is arranged in the reaction plate 2, and reaction grooves 21 are evenly opened in the reaction plate 2, and the reaction grooves 21 are annular, and the reaction grooves 21 are arranged concentrically and with increasing radius, and the cross section of the reaction grooves 21 is stepped, and the top of the reaction grooves 21 faces the center of the desulfurization tower 1; a rotating rod 22 is connected to the center of the desulfurization tower 1, and the rotating rod 22 is connected to the driving member 23 at the top of the desulfurization tower 1, and the rotating rod 22 passes through the center of the reaction plate 2; a cross bar 24 is arranged on the rotating rod 22, and the cross bar 24 is located at the upper and lower parts of the reaction plate 2, and reaction blocks 25 are evenly arranged on the top of the cross bar 24, and the reaction blocks 25 are located at the bottom of the reaction plate 2 and slide in the reaction groove 21; a scraper 26 is arranged at one end of the cross bar 24, and one side of the scraper 26 contacts the inner wall of the desulfurization tower 1; The circulating liquid device 16 is a conventional configuration device of the desulfurization tower 1, which is used to transport slurry into the desulfurization tower 1. The slurry is used to react with the flue gas to absorb sulfur-containing substances and purify the flue gas; the spray nozzle 12 is a conventional spray nozzle 12 for spraying slurry; the sensor is a conventional temperature sensor, which is used to detect the temperature of the reaction plate 2, and the driving component 23 is a conventional driving component, such as a motor component.

[0022] Specific working process: when purifying the flue gas, the desulfurization tower 1 is first started, and the circulating liquid device 16 continuously transports slurry into the desulfurization tower 1 through the spray pipe 11 and the spray pipe. The slurry sprays and falls from top to bottom and gathers at the bottom of the desulfurization tower 1; as the slurry gathers, the liquid level of the slurry rises and submerges the flue gas inlet 13, so that the flue gas bubbles out from the slurry gathered at the bottom of the desulfurization tower 1; on the one hand, the slurry is a conventional slurry used for reaction of lime slurry, and the slurry contains water. During the process of the flue gas bubbling out, it contacts with the water in the slurry, achieving the effect of washing the flue gas with water, filtering impurities in the flue gas, and avoiding too many impurities in the flue gas to affect the reaction effect. Thereby, the cleanliness of the flue gas is improved, the reaction effect is improved, and then the flue gas purification effect is improved; on the other hand, in order to ensure the purification effect of the discharged flue gas, the spraying amount of the slurry is usually greater than the purification amount of the flue gas, resulting in a large amount of unreacted slurry at the bottom of the desulfurization tower 1, causing waste; therefore, when the flue gas rises in the desulfurization tower 1, it reacts with the slurry gathered at the bottom of the desulfurization tower 1 in advance, first purifying a part of the flue gas, and then reacts again as the flue gas rises and the slurry descends and intersects with each other, ensuring the purification effect of the flue gas under the premise of reducing the spraying amount of the slurry, improving the utilization rate of the slurry, and thus improving the purification efficiency; after the flue gas is purified, it is discharged through the flue gas outlet 14 for subsequent purification; Furthermore, since a large amount of scaling exists on the inner wall of the desulfurization tower 1, it will affect the performance, safety and economy of the desulfurization tower 1; therefore, the slurry sprayed from the spray nozzle 12 falls on the reaction plate 2, flows through the reaction tank 21 and converges at the bottom of the desulfurization tower 1; the flue gas rises and contacts the bottom of the reaction plate 2, and the flue gas is guided by the stepped reaction tank 21 and converges to the center of the desulfurization tower 1, so as to avoid the slurry flowing down the inner wall of the desulfurization tower 1 from contacting with the flue gas, and the impurities such as flocs generated by the reaction adhere to the inner wall of the desulfurization tower 1 to form scaling, thereby improving the cleanliness of the inner wall of the desulfurization tower 1, ensuring that the inner wall of the desulfurization tower 1 is smooth, and improving the purification efficiency of the desulfurization tower 1; Moreover, since the reaction tank 21 is stepped, the rise of flue gas and the fall of slurry occur simultaneously in the reaction tank 21, and the space in the reaction tank 21 will not affect the rise and fall of the two; the slurry flows down along the bottom surface of the reaction tank 21, and the flue gas rises along the top surface of the reaction tank 21, and the two maintain contact in the process of passing through the reaction plate 2, which increases the contact area between the flue gas and the slurry and improves the contact effect compared to simple spraying; moreover, it takes time for the flue gas and the slurry to pass through the reaction tank 21, so that the reaction tank 21 prolongs the contact time for the flue gas and the slurry, improves the reaction effect, and thus improves the purification effect; in addition, after the flue gas passes through the reaction plate 2 and rises close to the center of the desulfurization tower 1, the sprayed slurry contacts the flue gas again to react, and the slurry gathered at the bottom of the desulfurization tower 1, the gas-liquid countercurrent contact in the middle and the spraying at the top improves the purification effect while reducing the slurry spraying amount and improving the utilization rate of the slurry, thereby improving the purification efficiency; Furthermore, the distribution of the reactive substance content of the slurry is as follows: the effective component of the slurry sprayed from the spray nozzle 12 in the desulfurization tower 1 is higher than that of the slurry flowing through the reaction plate 2, and the effective component of the slurry flowing through the reaction plate 2 is higher than that of the slurry gathered at the bottom of the desulfurization tower 1; the flue gas gradually contacts the slurries with different effective components during the rising process, that is: a part of the flue gas reacts after bubbling out, and another part reacts when the flue gas passes through the reaction plate 2. The flue gas that continues to rise has undergone two reactions, and a small amount of sulfur-containing substances remain in the flue gas. Finally, the flue gas contacts the slurry with a higher effective component, thereby ensuring the purification effect of the flue gas, improving the reaction effect, and avoiding the concentration of the slurry and the flue gas in a certain part of the desulfurization tower 1. The concentrated reaction will cause the sulfur dioxide concentration in the local area to decrease rapidly, forming a large concentration gradient, affecting the purification effect; The driving member 23 drives the rotating rod 22 to rotate, and the rotating rod 22 drives the scraper 26 and the reaction block 25 to rotate through the cross bar 24. The reaction block 25 scrapes the slurry in the reaction tank 21 to avoid the reaction impurities from being retained and forming scaling, maintains the internal space of the reaction tank 21, ensures the flow of the slurry, and thus improves the reaction effect; the scraper 26 scrapes the inner wall of the desulfurization tower 1 to avoid a large amount of scaling on the inner wall of the desulfurization tower 1, ensures that the inner wall of the desulfurization tower 1 is smooth, and improves the purification efficiency of the desulfurization tower 1; the cross bar 24 is located at the upper and lower parts of the reaction plate 2, and the top of the cross bar 24 located below the reaction plate 2 is provided with a reaction block 25, and the cross bars 24 located at the upper and lower parts of the reaction plate 2 are both provided with scrapers 26, and the scraper 26 scrapes the inner wall of the upper and lower parts of the reaction plate 2, and the bottom of the scraper 26 stirs the slurry gathered at the bottom of the desulfurization tower 1 to avoid the flue gas bubbling out at the same position for a long time, resulting in a decrease in the effective components here, and by stirring its effective components to be evenly distributed, the reaction effect is improved, thereby improving the purification effect.

[0023] Embodiment 2: On the basis of the first embodiment, a rotating ring 27 is sleeved on the rotating rod 22, and the rotating ring 27 is rotatably connected to the rotating rod 22, and a No. 1 electric push rod 28 is installed in the rotating rod 22, and the telescopic end of the No. 1 electric push rod 28 extends out of the inner wall of the rotating rod 22 and engages with the inner wall of the rotating ring 27; the outer ring of the rotating ring 27 is slidably connected to a soaking box 29, and the soaking box 29 is located at one side of the rotating ring 27 for lifting, and the soaking agent in the soaking box 29 is used to clean the spray nozzle 12; the inner wall of the desulfurization tower 1 is provided with a slide groove 3, and one end of the soaking box 29 slides in the slide groove 3, the slide groove 3 is arc-shaped near the spray nozzle 12, and the spray nozzles 12 are arranged in a straight line; A No. 1 pipe 31 is installed in the reaction plate 2, and the No. 1 pipe 31 is uniformly surrounded inside the reaction plate 2. A part of the No. 1 pipe 31 is located inside the reaction plate 2, and the other part surrounds the inner wall of the desulfurization tower 1. One end of the No. 1 pipe 31 is located outside the desulfurization tower 1 and is wound around the spray pipe 11; a circulation pump assembly 32 is installed on the surface of the desulfurization tower 1, and is used for the circulation of the heat exchange solution in the No. 1 pipe 31; A soaking rod 33 is slidably connected to the soaking box 29 through a spring, and the soaking rod 33 contacts the spray nozzle 12 through a cleaning brush 34 arranged on the surface; one end of the soaking rod 33 extends from the top of the soaking box 29 and is located at the bottom of the soaking box 29, and a toggle block 35 is evenly arranged on the rotating rod 22, and one side of the toggle block 35 is an inclined surface, and the inclined surface of the toggle block 35 contacts one end of the soaking rod 33; a stopper 36 is slidably connected to the chute 3 through a spring, and the stopper 36 is evenly distributed, and the stopper 36 is retracted into the inner wall of the desulfurization tower 1, and the stopper 36 contacts one end of the soaking box 29; The soaking rod 33 is rotatably connected with a rotating block 37, and a cleaning brush 34 is disposed on the rotating block 37, and the rotating block 37 cleans the spray nozzle 12 through the cleaning brush 34; a driving bar 38 is disposed on the inner wall of the soaking box 29, and the driving bar 38 is engaged with the rotating block 37; The soaking box 29 is provided with comb teeth 39, and the comb teeth 39 are inserted into the cleaning brush 34; the cleaning brush 34 is made of a tough material, and the cleaning brush 34 is annularly convex near the end; The spray pipe 11 contains an electromagnetic valve, which can control the closure of a row of spray nozzles 12. When a row of spray nozzles 12 in the spray pipe 11 is closed, the slurry sprayed by the remaining spray nozzles 12 can make up for the spraying area of ​​the closed spray nozzles 12, avoiding serious uneven distribution of the sprayed slurry; the No. 1 electric push rod 28 and the No. 2 electric push rod 51 are both conventional electric telescopic devices, and have their own power supply function, so that there is no need to consider the problem of power supply lines; the desulfurization tower 1 controls the start and stop of the No. 1 electric push rod 28 and the No. 2 electric push rod 51 through wireless signals; the soaking agent is a conventional solvent for cleaning the spray nozzle 12; the circulating pump assembly 32 is a conventional pump for solution heat exchange circulation, and the circulating pump assembly 32 drives the circulation of the heat exchange solution in the No. 1 pipe 31; the chute 3 forms a ring around the inner wall of the desulfurization tower 1, and the chute 3 is located below the spray nozzle 12 and is curved in an arc shape close to the spray nozzle 12.

[0024] Specific working process: the rotating rod 22 drives the No. 1 electric push rod 28 to rotate. When the No. 1 electric push rod 28 is powered off, the telescopic end of the No. 1 electric push rod 28 retracts into the rotating rod 22 and does not contact the inner wall of the rotating ring 27. Since the rotating ring 27 is rotatably connected to the sleeve on the rotating rod 22, the friction resistance between one end of the soaking box 29 and the slide groove 3 makes the rotating ring 27 in a static state. At this time, the soaking box 29 is located in the arc part of the slide groove 3, and the spray nozzle 12 is located in the soaking box 29 and is submerged in the soaking agent. The spray nozzle 12 is submerged in the soaking agent to complete the cleaning and dredging; when the No. 1 electric push rod 28 is powered on, the telescopic end of the No. 1 electric push rod 28 extends out of the surface of the rotating rod 22 and is in close contact with the inner wall of the conversion, so that the rotating rod 22 drives the rotating ring 27 to rotate through the No. 1 electric push rod 28, and the rotating ring 27 drives the soaking box 29 to overcome the friction resistance of the slide groove 3 and rotate, and the soaking box 29 slides along the arc part of the slide groove 3 away from the spray nozzle When the nozzle 12 is soaked, the soaking box 29 slides and descends on one side of the rotating ring 27; when the soaking box 29 approaches the next spray nozzle 12, the soaking box 29 moves to the arc-shaped part of the slide 3 and submerges the next spray nozzle 12, at this time, the No. 1 electric push rod 28 retracts away from the inner wall of the rotating ring 27, and the rotating ring 27 stops moving due to the friction resistance between the soaking box 29 and the slide 3; when the spray nozzle 12 is soaked, the spray pipe 11 closes the corresponding spray nozzle 12 through the electromagnetic valve to stop spraying the slurry, and when the spray nozzle 12 does not need to be soaked, the soaking box 29 moves and remains at a position away from the spray nozzle 12; the soaking and unblocking of the spray nozzle 12 by the soaking box 29 can prevent the spray nozzle 12 from being affected by factors such as scaling, resulting in blockage that affects the slurry spraying, thereby maintaining the slurry spraying effect, improving the gas-liquid contact reaction effect, and further improving the flue gas purification effect; The ambient temperature of the gas-liquid reaction in the desulfurization tower 1 has a great influence on the flue gas purification effect. The conventional reaction process of slurry purification of flue gas is exothermic. The desulfurization tower 1 achieves a cooling effect by lowering the temperature of the slurry and spraying it inside the desulfurization tower 1, thereby maintaining the reaction temperature in the desulfurization tower 1; therefore, when the desulfurization tower 1 purifies the flue gas, the circulating pump assembly 32 drives the heat exchange solution to flow in the No. 1 pipe 31, and the part of the No. 1 pipe 31 located outside the desulfurization tower 1 is wound around the spray pipe 11. The low-temperature slurry flowing in the spray pipe 11 cools the No. 1 pipe 31 and reduces the temperature of the internal heat exchange solution; then, the cooled heat exchange solution flows to the No. 1 pipe located inside the reaction plate 2. 31, in combination with the slurry spraying on the reaction plate 2, the reaction plate 2 is cooled, so that the gas and liquid in the reaction tank 21 can be at a suitable ambient temperature, thereby improving the reaction effect and thus improving the purification effect; and, it can also reduce the heat generated by the friction of the reaction block 25 scraping the reaction tank 21, thereby avoiding the temperature rise of the reaction plate 2; and, the heat exchange effect of the No. 1 tube 31 is achieved by using low-temperature slurry, without the need for additional cooling devices. After the low-temperature slurry is heat exchanged, the temperature of the slurry is slightly increased when it is sprayed, thereby reducing the temperature difference when the gas and liquid contact, thereby avoiding the solubility of sulfur dioxide in the slurry from decreasing, thereby improving the reaction effect of the gas and liquid, and further improving the purification effect; When the soaking box 29 slides in the slide groove 3, it contacts the block 36. The block 36 blocks the soaking box 29 with friction resistance, ensuring that the soaking box 29 is fixed when the No. 1 electric push rod 28 is powered off; when the swivel 27 drives the soaking box 29 to rotate, the soaking box 29 squeezes the block 36 and squeezes the block 36 back into the inner wall of the desulfurization tower 1, so that the soaking box 29 passes the block 36 to complete the movement; when the nozzle is soaked, the soaking box 29 is in a fixed state, and the rotating rod 22 drives the toggle block 35 to rotate, and the inclined The surface contacts one end of the soaking rod 33, so that the soaking rod 33 moves from one end to the other end of the soaking box 29. When the toggle block 35 passes over the soaking rod 33, the soaking rod 33 is reset by the spring, and the purpose of the reciprocating movement of the soaking rod 33 is completed; during the soaking process of the spray nozzle 12, the soaking agent softens and unclogs the spray nozzle 12, while the soaking rod 33 drives the cleaning brush 34 to reciprocate and wash the spray nozzle 12, thereby improving the cleanliness of the spray nozzle 12, thereby improving the spraying effect of the slurry, and further improving the gas-liquid reaction purification effect; The movement of the soaking rod 33 drives the rotating block 37 to move. During the movement of the rotating block 37, the rotating block 37 keeps meshing with the driving bar 38, so that the rotating block 37 rotates along the driving bar 38, so as to achieve the purpose of rotating while the rotating block 37 moves. The rotation of the rotating block 37 drives the cleaning brush 34 to rotate and wash the spray nozzle 12. For example, when the rotating block 37 moves close to the chute 3, it rotates forward, and the cleaning brush 34 washes the spray nozzle 12 in the forward state; when the rotating block 37 moves away from the chute 3, it reverses, and the cleaning brush 34 washes the spray nozzle 12 in the reverse state. While the cleaning brush 34 moves and washes, it washes the spray nozzle 12 in a forward and reverse manner, which is more conducive to washing the surface of the spray nozzle 12, further improving the cleanliness of the spray nozzle 12, thereby improving the spraying effect of the slurry, and then improving the gas-liquid reaction purification effect; The cleaning brush 34 is made of a conventional tough material, such as plastic. During the reciprocating movement of the cleaning brush 34 driven by the soaking rod 33, each time the soaking rod 33 is reset, the soaking rod 33 drives the cleaning brush 34 to pass through the comb teeth 39, and the comb teeth 39 are inserted into the cleaning brush 34 to comb out the scale mixed in the cleaning brush 34 and discharge it from the cleaning brush 34, thereby improving the cleaning degree of the cleaning brush 34; and, since the edge of the raised part of the cleaning brush 34 is an edge, that is, the cleaning brush 34 contains a plurality of annular sharp protrusions near the end, which are used to scratch the surface of the spray nozzle 12 during the scrubbing process of the cleaning brush 34, and the tough material is used to provide a supporting force for the cleaning brush 34, so that the raised part of the cleaning brush 34 can more effectively scrape off the hard-to-remove scale on the surface of the spray nozzle 12, thereby improving the cleanliness of the spray nozzle 12, thereby improving the spraying effect of the slurry, and then improving the gas-liquid reaction purification effect; after soaking the spray nozzle 12 for a long time, the worker can complete the cleaning of the inside of the soaking box 29 by replacing the soaking agent inside the soaking box 29.

[0025] Embodiment three: On the basis of the second embodiment, the bottom of the reaction plate 2 is evenly provided with hydraulic cylinders 4, and the hydraulic cylinders 4 are distributed in an annular manner. The bottom of the hydraulic cylinder 4 is slidably connected with a hydraulic plug 41 through a spring. The cross section of the hydraulic plug 41 is an I-shaped. One end of the hydraulic plug 41 is located in the hydraulic cylinder 4, and the other end is located at the bottom of the hydraulic cylinder 4. The cross bar 24 is located below the reaction plate 2 and is provided with a hydraulic rod 42. The top of the hydraulic rod 42 contacts the bottom of the hydraulic plug 41; one side of the hydraulic cylinder 4 is provided with a liquid collecting pipe 43, and the top of the liquid collecting pipe 43 is located at the bottom of the reaction tank 21, and the bottom is connected to the hydraulic cylinder 4 through a one-way valve; the top of the hydraulic cylinder 4 is installed with a liquid infusion pipe 44 through a one-way valve, and one end of the liquid infusion pipe 44 is located at the top of the reaction tank 21 to transport the reaction slurry toward the bottom of the reaction tank 21; The hydraulic plug 41 has filter holes 45 evenly formed at one end, and a filter screen 46 is provided at the bottom of the filter hole 45. A filter plate 47 is hinged to the top of the filter hole 45 through a torsion spring, and the filter plate 47 is engaged with the filter hole 45. An airbag 48 is provided at the bottom of the hydraulic cylinder 4, and the bottom of the airbag 48 is connected to the bottom of the hydraulic plug 41, and the airbag 48 is located between the bottom of the hydraulic cylinder 4 and the bottom of the hydraulic plug 41; a suction pipe 49 is provided inside the middle part of the hydraulic plug 41, and one end of the suction pipe 49 is connected to the airbag 48, and the other end is located at the bottom of the filter 46 and close to the filter 46.

[0026] Specific working process: the rotating rod 22 drives the hydraulic rod 42 to rotate, and the hydraulic rod 42 rotates to contact the bottom of the hydraulic plug 41, squeezing the hydraulic plug 41 upward and extending it into the hydraulic cylinder 4; part of the slurry passing through the reaction tank 21 drips into the collecting pipe 43, and the other part overflows from the collecting pipe 43 and drips to the bottom of the desulfurization tower 1; the hydraulic plug 41 rises to squeeze the slurry in the hydraulic cylinder 4 into the liquid infusion pipe 44, and the slurry is transported to the reaction tank 21 through the liquid infusion pipe 44, so that the slurry can flow through the reaction tank 21 for multiple times to perform gas-liquid contact reaction, thereby improving the utilization rate of the effective components in the slurry, improving the reaction effect, and reducing the amount of slurry used; The hydraulic plug 41 rises, and the slurry between the hydraulic plug 41 and the top of the hydraulic cylinder 4 is squeezed into the liquid delivery pipe 44. A negative pressure is formed in the space between the hydraulic plug 41 and the bottom of the hydraulic cylinder 4, and the slurry is sucked into the liquid collecting pipe 43 through the one-way valve; after the hydraulic rod 42 passes over the hydraulic plug 41, the hydraulic plug 41 is reset by the spring, and the hydraulic plug 41 descends to squeeze the slurry between the hydraulic plug 41 and the bottom of the hydraulic cylinder 4, so that the slurry passes through the filter hole 45, squeezes the filter plate 47, passes through the hydraulic plug 41, and enters the space between the hydraulic plug 41 and the hydraulic cylinder 4. When the slurry passes through the filter screen 46, it is filtered by the filter screen 46, and the reaction products in the slurry are intercepted in the space between the hydraulic plug 41 and the bottom of the hydraulic cylinder 4, thereby improving the cleanliness of the slurry when it is reused, thereby improving the reaction effect; when the hydraulic plug 41 rises, no more slurry passes through the filter hole 45 from bottom to top, and the filter plate 47 is reset by the torsion spring and re-engaged with the filter hole 45, completing the sealing of one end of the hydraulic plug 41, so that the hydraulic plug 41 can squeeze the slurry into the infusion tube 44; When the hydraulic plug 41 rises, it is in a state of sucking slurry, and the filter screen 46 is away from the slurry. The hydraulic plug 41 rises and pulls the airbag 48, and the airbag 48 sucks the filtered impurities to the filter screen 46 through the suction pipe 49; after the impurities enter the inside of the airbag 48, the hydraulic plug 41 descends and squeezes the airbag 48, and the airbag 48 sprays the sucked impurities to the bottom of the desulfurization tower 1 through the internally configured air outlet, completing the impurity removal and filtration work during the recycling of the slurry, avoiding impurities from affecting the filtering capacity of the filter screen 46, thereby improving the filtering efficiency of the slurry, cooperating with the descaling effect of the spray nozzle 12 to maintain the cleanliness, further improving the utilization efficiency of the slurry, and then improving the purification effect of the flue gas.

[0027] Embodiment 4: On the basis of the third embodiment, the inner wall of the desulfurization tower 1 is evenly provided with guide rings 5, and the scraper 26 contacts the guide rings 5; The guide rings 5 ​​are staggeredly distributed with the middle of the desulfurization tower 1 as the reference, the first guide ring 5 is located on one side of the desulfurization tower 1, the second guide ring 5 is located on the other side of the desulfurization tower 1, and the edge of the reaction plate 2 contacts the guide ring 5; a second electric push rod 51 is provided inside the rotating rod 22, and a driving rod 52 is provided at the telescopic end of the second electric push rod 51, one end of the driving rod 52 passes through the bottom of the rotating rod 22 and is located below the rotating rod 22, and the second electric push rod 51 is vertically arranged; the reaction plate 2 is slidably connected to the rotating rod 22, and the reaction plate 2 is divided into two parts based on the middle position, and is symmetrically divided into The desulfurization tower 1 has a plurality of desulfurization rings 5, each of which is provided with a lifting rod 53 at the bottom. The end of the lifting rod 53 is annularly sleeved on the driving rod 52, and a spring is provided between the driving rod 52 and the lifting rod 53. There are at least two guide rings 5, which are called guide ring 1 and guide ring 2. The guide ring 5 is located on the inner wall of one side of the desulfurization tower 1, and the guide ring 5 is located on the inner wall of the other side, and the guide ring 5 is located below the guide ring 5. The reaction plate 2 is divided into two, so that the number of the No. 1 pipe 31 is also increased, ensuring that the flow of the heat exchange solution inside the No. 1 pipe 31 cools the reaction plate 2.

[0028] Specific working process: below the reaction plate 2, the slurry drips from the reaction tank 21 and stays away from the inner wall of the desulfurization tower 1; above the reaction plate 2, the slurry is sprayed out, and part of the slurry flows down along the inner wall of the desulfurization tower 1, and contacts with the flue gas, causing scaling on the inner wall of the desulfurization tower 1; therefore, when the slurry flows down along the inner wall of the desulfurization tower 1, it passes through the guide ring 5, and the guide ring 5 guides the slurry to move toward the center of the desulfurization tower 1, away from the inner wall of the desulfurization tower 1, thereby reducing the amount of scaling on the inner wall of the desulfurization tower 1, improving the cleanliness of the inner wall of the desulfurization tower 1, and thus improving the gas-liquid reaction effect inside the desulfurization tower 1; even if scaling occurs on the surface of the guide ring 5 and the inner wall of the desulfurization tower 1 above, the scaling area of ​​this part is small, and it is easier to clean than when scaling is formed on the entire inner wall of the desulfurization tower 1, and the scraper 26 scrapes the inner wall of the desulfurization tower 1 and the surface of the guide plate, further improving the cleanliness of the inner wall of the desulfurization tower 1; Furthermore, the rotating rod 22 drives the No. 2 electric push rod 51 and the driving rod 52 to rotate, and one end of the lifting rod 53 is arranged on the driving rod 52 in a ring shape, and a spring is arranged between the driving rod 52 and the bottom of the lifting rod 53, so that the driving rod 52 can drive the lifting rod 53 to rise and fall, and the lifting rod 53 is affected by the fixed state of the reaction plate 2 and will not rotate with the driving rod 52; when the sulfur-containing substances in the flue gas are less, the workers can take measures for the flue gas with less sulfur-containing substances, that is: the No. 2 electric push rod 51 retracts to drive the driving rod 52 to rise, and the driving rod 52 is driven by the spring The two lifting rods 53 and the reaction plates 2 rise, one of the two reaction plates 2 contacts the bottom of the first guide ring 5 and stops rising due to being blocked, while the other continues to rise until it contacts the second guide ring 5 until it stops. At this time, the two reaction plates 2 are in a staggered separation state, and the flue gas flows upward through the two reaction plates 2 and contacts the sprayed slurry to perform purification work; by switching the separation or merging state of the reaction plates 2, the desulfurization tower 1 can treat the flue gas differently according to the impurity content in the flue gas, thereby improving the convenience of use and further improving the practicality of the purification system; In addition, the two reaction plates 2 in the staggered separation state form a curved flue gas flow channel in the desulfurization tower 1. The flue gas needs to change direction to pass between the two reaction plates 2 to flow upward, thereby extending the rising time of the flue gas, increasing the gas-liquid contact time, and improving the flue gas purification effect.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A biomass boiler flue gas ultra-low emission purification system, comprising a conveying module, a purification module, an emission detection module and a control module, wherein the purification module comprises a desulfurization tower (1), and the flue gas is desulfurized by the desulfurization tower (1); characterized in that: The desulfurization tower (1) comprises: A spray pipe (11), wherein the spray pipe (11) is evenly arranged in the desulfurization tower (1), and spray nozzles (12) are evenly arranged at the bottom of the spray pipe (11); a flue gas inlet (13) is installed at the bottom of one side of the desulfurization tower (1), a flue gas outlet (14) is installed at the top of one side, and a waste liquid outlet (15) is installed at the bottom of the other side of the desulfurization tower (1); a circulating liquid device (16) is installed at one side of the desulfurization tower (1), and the circulating liquid device (16) is connected to the spray pipe (11) and is used to supply solution to the spray nozzle (12); A reaction plate (2), the reaction plate (2) being arranged in the middle of the desulfurization tower (1), and a sensor being arranged in the reaction plate (2), reaction grooves (21) being evenly arranged in the reaction plate (2), the reaction grooves (21) being annular, the reaction grooves (21) being concentric and arranged with increasing radius, the cross section of the reaction grooves (21) being stepped, and the top of the reaction grooves (21) facing the center of the desulfurization tower (1); a rotating rod (22) being rotatably connected to the center of the desulfurization tower (1), and the rotating rod (22) being connected to the desulfurization tower (1) 1) is connected to a driving member (23) at the top, and a rotating rod (22) passes through the center of a reaction plate (2); a cross bar (24) is provided on the rotating rod (22), the cross bar (24) is located at the upper and lower parts of the reaction plate (2), and reaction blocks (25) are evenly provided on the top of the cross bar (24), and the reaction blocks (25) are located at the bottom of the reaction plate (2) and slide in the reaction tank (21); a scraper (26) is provided at one end of the cross bar (24), and one side of the scraper (26) contacts the inner wall of the desulfurization tower (1).

2. The ultra-low emission purification system for biomass boiler flue gas according to claim 1 is characterized by: The rotating rod (22) is sleeved with a rotating ring (27), the rotating ring (27) is rotatably connected to the rotating rod (22), and a No. 1 electric push rod (28) is installed in the rotating rod (22), and the telescopic end of the No. 1 electric push rod (28) extends out of the inner wall of the rotating rod (22) and engages with the inner wall of the rotating ring (27); the outer ring of the rotating ring (27) is slidably connected with a soaking box (29), and the soaking box (29) is located on one side of the rotating ring (27) and rises and falls, and the soaking agent in the soaking box (29) cleans the spray nozzle (12); the inner wall of the desulfurization tower (1) is provided with a slide groove (3), and one end of the soaking box (29) slides in the slide groove (3), the slide groove (3) is arc-shaped near the spray nozzle (12), and the spray nozzles (12) are arranged in a straight line; A No. 1 pipe (31) is installed in the reaction plate (2), and the No. 1 pipe (31) is uniformly surrounded by the inside of the reaction plate (2). A part of the No. 1 pipe (31) is located in the reaction plate (2), and the other part surrounds the inner wall of the desulfurization tower (1). One end of the No. 1 pipe (31) is located outside the desulfurization tower (1) and is wound around the spray pipe (11); a circulation pump assembly (32) is installed on the surface of the desulfurization tower (1) and is used for circulating the heat exchange solution in the No. 1 pipe (31).

3. The ultra-low emission purification system for biomass boiler flue gas according to claim 2 is characterized by: A soaking rod (33) is slidably connected to the soaking box (29) via a spring, and the soaking rod (33) contacts the spray nozzle (12) via a cleaning brush (34) arranged on the surface; one end of the soaking rod (33) extends from the top of the soaking box (29) and is located at the bottom of the soaking box (29); a toggle block (35) is evenly arranged on the rotating rod (22), and one side of the toggle block (35) is an inclined surface, and the inclined surface of the toggle block (35) contacts one end of the soaking rod (33); a stopper (36) is slidably connected to the slide groove (3) via a spring, the stopper (36) is evenly distributed, and the stopper (36) is retracted into the inner wall of the desulfurization tower (1), and the stopper (36) contacts one end of the soaking box (29).

4. The ultra-low emission purification system for flue gas from a biomass boiler according to claim 3 is characterized by: A rotating block (37) is rotatably connected to the soaking rod (33), and a cleaning brush (34) is arranged on the rotating block (37). The rotating block (37) cleans the spray nozzle (12) through the cleaning brush (34); a driving bar (38) is arranged on the inner wall of the soaking box (29), and the driving bar (38) is meshed with the rotating block (37).

5. The ultra-low emission purification system for biomass boiler flue gas according to claim 4 is characterized in that: Comb teeth (39) are installed in the soaking box (29), and the comb teeth (39) are inserted into the cleaning brush (34); the cleaning brush (34) is made of a tough material, and the cleaning brush (34) is in the shape of an annular protrusion near the end.

6. The ultra-low emission purification system for biomass boiler flue gas according to claim 1 is characterized by: The bottom of the reaction plate (2) is evenly provided with hydraulic cylinders (4), and the hydraulic cylinders (4) are distributed in an annular manner. The bottom of the hydraulic cylinder (4) is slidably connected with a hydraulic plug (41) via a spring. The cross section of the hydraulic plug (41) is an I-shaped. One end of the hydraulic plug (41) is located in the hydraulic cylinder (4), and the other end is located at the bottom of the hydraulic cylinder (4). The cross bar (24) is located below the reaction plate (2) and is provided with a hydraulic rod (42). The top of the hydraulic rod (42) contacts the bottom of the hydraulic plug (41). One side of the hydraulic cylinder (4) is provided with a liquid collecting pipe (43), and the top of the liquid collecting pipe (43) is located at the bottom of the reaction tank (21). The bottom is connected to the hydraulic cylinder (4) via a one-way valve. The top of the hydraulic cylinder (4) is provided with a liquid infusion pipe (44) via a one-way valve, and one end of the liquid infusion pipe (44) is located at the top of the reaction tank (21) to transport the reaction slurry toward the bottom of the reaction tank (21).

7. The ultra-low emission purification system for biomass boiler flue gas according to claim 6 is characterized by: One end of the hydraulic plug (41) is evenly provided with filter holes (45), and a filter screen (46) is provided at the bottom of the filter hole (45). A filter plate (47) is hingedly connected to the top of the filter hole (45) through a torsion spring, and the filter plate (47) is engaged with the filter hole (45).

8. The ultra-low emission purification system for flue gas from a biomass boiler according to claim 7 is characterized by: An air bag (48) is provided at the bottom of the hydraulic cylinder (4), and the bottom of the air bag (48) is connected to the bottom of the hydraulic plug (41), and the air bag (48) is located between the bottom of the hydraulic cylinder (4) and the bottom of the hydraulic plug (41); a suction pipe (49) is provided inside the middle part of the hydraulic plug (41), and one end of the suction pipe (49) is connected to the air bag (48), and the other end is located at the bottom of the filter screen (46) and close to the filter screen (46).

9. The ultra-low emission purification system for biomass boiler flue gas according to claim 1 is characterized by: The inner wall of the desulfurization tower (1) is evenly provided with guide rings (5), and the scraper (26) contacts the guide rings (5).

10. The ultra-low emission purification system for biomass boiler flue gas according to claim 9, characterized in that: The guide rings (5) are staggeredly distributed with the middle of the desulfurization tower (1) as the reference; a No. 2 electric push rod (51) is arranged inside the rotating rod (22), and a driving rod (52) is arranged at the telescopic end of the No. 2 electric push rod (51), one end of the driving rod (52) passes through the bottom of the rotating rod (22) and is located below the rotating rod (22), and the No. 2 electric push rod (51) is vertically arranged; the reaction plate (2) is slidably connected to the rotating rod (22), the reaction plate (2) is divided into two parts with the middle position as the reference, and is symmetrically distributed, and a lifting rod (53) is arranged at the bottom of each reaction plate (2), the end of the lifting rod (53) is annularly sleeved on the driving rod (52), and a spring is arranged between the driving rod (52) and the lifting rod (53).

Images