Desulfurization purification system for tail gas generated in refractory brick production

Abstract

The utility model discloses a refractory brick production tail gas desulfurization purification system which comprises a tail gas collecting pipe and a desulfurization tank, a filter box is arranged at an outlet of the tail gas collecting pipe, a filter assembly is detachably installed in the filter box, and a gas guide pipe extending to be communicated with the desulfurization tank is arranged on the filter box. A first-stage desulfurization assembly, a second-stage desulfurization assembly and a gas-liquid separation plate are sequentially arranged in the desulfurization tank above an outlet of the gas guide pipe from bottom to top, an alkali liquor conveying pipe communicated with the first-stage desulfurization assembly and the second-stage desulfurization assembly is arranged on the outer side of the desulfurization tank, a liquid discharge pipe is arranged at the bottom of the desulfurization tank, and an outlet of the liquid discharge pipe is connected with a recovery tank; a circulating pipe communicated with the alkali liquor conveying pipe is arranged on the recovery tank, an exhaust pipe is arranged at the top of the desulfurization tank, and a blow-off pipe is arranged on the recovery tank. According to the device, particle impurities in tail gas can be separated, the pipeline blockage phenomenon is prevented, sulfides in the tail gas can be thoroughly removed, and the tail gas desulfurization effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to solid waste resource processing technology field, concretely relates to a desulfurization purification system for tail gas of firebrick production. BACKGROUND

[0002] Firebrick is made of various materials such as refractory clay, high alumina powder and industrial solid waste, etc. It is made through forming, drying, firing and other manufacturing processes. The tail gas generated during the sintering process of firebrick will emit a large amount of sulfur dioxide and other harmful substances, which will seriously pollute the environment and also affect human health. Therefore, it is necessary to carry out desulfurization treatment on the sintering tail gas of the brick factory during the production process of firebrick. The commonly used flue gas desulfurization technologies at present are dry desulfurization, semi-dry desulfurization and wet desulfurization. Dry desulfurization technology: dry desulfurization usually includes selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR), which can reduce the concentration of sulfides in flue gas to a low level; semi-dry desulfurization technology: semi-dry desulfurization usually uses spray drying (DSI) technology, which brings solid alkali absorbent into flue gas to convert sulfur dioxide into calcium sulfide; wet desulfurization technology: wet desulfurization usually uses alkaline solution to absorb sulfur dioxide in flue gas and convert it into recoverable sulfate; due to its high desulfurization efficiency and relatively low cost, wet desulfurization technology is a common choice during the sintering process of the brick factory. Different solutions such as calcium oxide, sodium oxide and alkaline calcium carbonate solution can be used during wet desulfurization, which effectively removes sulfur dioxide in waste gas through washing and adsorption processes to meet the national emission standards. In the existing wet desulfurization process technology, the desulfurization tank used mainly uses a spray pipe to carry out spray desulfurization treatment on the tail gas. It is found that during the use of the device, the sintering tail gas directly enters the desulfurization tank for spray treatment. The sintering tail gas contains dust particles, which can easily cause blockage during the desulfurization process, affecting the desulfurization effect. At the same time, the spray pipe used in the existing technology has a single structure design and cannot carry out omnidirectional spray treatment on the tail gas, resulting in unsatisfactory desulfurization effect. Therefore, it is an objective need to develop a desulfurization purification system for tail gas of firebrick production, which has reasonable structure, pipeline is not easy to block and desulfurization effect is remarkable. SUMMARY

[0003] The utility model aims at providing a desulfurization purification system for tail gas of firebrick production, which has reasonable structure, pipeline is not easy to block and desulfurization effect is remarkable.

[0004] The utility model discloses a tail gas collecting pipe and desulfurization jar, the outlet of tail gas collecting pipe is provided with the filter box, and the filter box is detachably installed with filter assembly.

[0005] Compared with the prior art, the device has the following advantages: first, the filter box is arranged before the tail gas enters the desulfurization jar, the filter assembly in the filter box can filter the tail gas entering the filter box, separate the particulate impurities in the tail gas, prevent the particulate impurities from entering the desulfurization jar and causing pipeline blockage, and effectively improve the stability of tail gas desulfurization treatment; second, the structure of the desulfurization jar is optimized, the primary desulfurization assembly arranged in the desulfurization jar can form a water curtain to perform primary spray treatment on the tail gas, the secondary desulfurization assembly is arranged to perform omnidirectional secondary spray treatment on every position corner in the desulfurization jar, the cooperation of the primary desulfurization assembly and the secondary desulfurization assembly can realize omnidirectional spray treatment on the tail gas, completely remove sulfides in the tail gas, significantly improve the desulfurization effect of the tail gas, and the gas-liquid separation plate arranged can perform gas-liquid separation on the tail gas after desulfurization, reduce the water content in the tail gas, and improve the desulfurization effect and functionality of the system. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 It is the whole structure schematic diagram of the utility model;

[0007] Figure 2 It is Figure 1 It is the enlarged schematic diagram of part A;

[0008] In the figure: 1 - tail gas collection pipe, 2 - desulfurization tank, 21 - gas-liquid separation plate, 22 - lower cone cover, 23 - upper cone cover, 24 - primary desulfurization pipe, 25 - liquid distribution cone, 26 - secondary desulfurization pipe, 27 - spray pipe, 28 - rotary joint, 29 - protective shell, 210 - transmission worm, 211 - worm gear, 212 - second motor, 3 - filter box, 31 - filter screen, 32 - pull box, 33 - fixed sleeve, 34 - end plate, 35 - guide rod, 36 - spring, 37 - handle, 38 - first motor, 39 - transmission shaft, 310 - eccentric wheel, 311 - ball, 312 - sealing ring, 4 - air guide pipe, 5 - lye delivery pipe, 51 - liquid inlet valve, 52 - pressure pump, 6 - liquid discharge pipe, 7 - recovery tank, 8 - circulation pipe, 9 - exhaust pipe. DETAILED DESCRIPTION

[0009] The utility model makes further explanation in combination with the drawings, but not in any way to the utility model add restrictions, based on the utility model teach to make any change or improvement, all belong to the protection scope of the utility model.

[0010] As Figures 1-2 Indicated, the utility model includes tail gas collection pipe 1 and desulfurization tank 2, the outlet of tail gas collection pipe 1 is provided with filter box 3, the filter box 3 is detachably installed with filter assembly, and filter box 3 is provided with air guide pipe 4 extending to the communication of desulfurization tank 2, air guide pipe 4 is arranged in the inclination downward in desulfurization tank 2, and air guide pipe 4 is arranged into the structure of downward in desulfurization tank 2, and its purpose is to slow down the flow speed of tail gas in desulfurization tank 2, so that tail gas is fully contacted with lye, and in the desulfurization tank 2 above the outlet of air guide pipe 4, from bottom to top, primary desulfurization assembly, secondary desulfurization assembly and gas-liquid separation plate 21 are sequentially provided, the outside of desulfurization tank 2 is provided with lye delivery pipe 5 in communication with primary desulfurization assembly and secondary desulfurization assembly, lye delivery pipe 5 is sequentially provided with liquid inlet valve 51 and pressure pump 52 along the liquid flow direction, and lye delivery pipe 5 delivers lye to primary desulfurization assembly and secondary desulfurization assembly, and the tail gas is washed by using lye, and the lye can use calcium hydroxide, calcium carbonate and the like solution, the bottom of desulfurization tank 2 is provided with liquid discharge pipe 6, the outlet of liquid discharge pipe 6 is connected with recovery tank 7, recovery tank 7 is provided with circulation pipe 8 in communication with lye delivery pipe 5, circulation pump is arranged on circulation pipe 8, the top of desulfurization tank 2 is provided with exhaust pipe 9, recovery tank 7 is provided with blowdown pipe 10, blowdown valve is arranged on blowdown pipe 10, and blowdown pipe is arranged on recovery tank, and blowdown valve is arranged on blowdown pipe.

[0011] The working process of the device is: the tail gas generated by the refractory brick sintering is first collected by the tail gas collecting pipe 1 and then enters the filter box 2, the filter assembly in the filter box 2 can filter the particulate impurities carried in the tail gas, reduce the impurity content in the tail gas, and the particulate impurities filtered out are left in the filter assembly and can be cleaned regularly, the tail gas after filtering treatment enters the lower part of the desulfurization tank 2 through the gas guide pipe 4, after the tail gas enters the desulfurization tank 2, the liquid inlet valve 51 and the pressure pump 52 on the alkali liquid conveying pipe 5 are opened, the alkali liquid conveying pipe 5 can convey the prepared alkali liquid to the primary desulfurization assembly and the secondary desulfurization assembly, the tail gas continuously flows upward after entering the desulfurization tank 2, at this time, the alkali liquid forms a water curtain after passing through the primary desulfurization assembly, and the tail gas is first subjected to primary spray treatment, the tail gas continues to move upward and enters the secondary desulfurization assembly, the alkali liquid is sprayed downward again to perform secondary spray treatment on the tail gas, after two times of spray treatment, the sulfides in the tail gas can be completely washed and sprayed, the tail gas after washing and spraying is separated from the water in the tail gas through the gas-liquid separation plate 21, the cleanliness of the tail gas is improved, the treated tail gas is directly discharged into the chimney from the exhaust pipe 9, and the alkali liquid for washing the tail gas falls into the bottom of the desulfurization tank 2, is discharged into the recovery tank 7 through the liquid discharge pipe 6, and the alkali liquid in the recovery tank 7 can be detected by using a concentration instrument, if the concentration of the alkali liquid is lower than the set standard value, the alkali liquid can be recycled, the circulating pump on the circulating pipe 8 is opened, the liquid inlet valve is closed, and the alkali liquid in the recovery tank 7 can be returned to the primary desulfurization assembly and the secondary desulfurization assembly for recycling, if the concentration of the alkali liquid is higher than the set standard value, the blowdown valve on the blowdown pipe 10 is opened, and the alkali liquid is discharged into the sewage treatment system for subsequent purification treatment.

[0012] Further, the filter assembly comprises a filter screen 31 and a pull-out box 32, a pull-out slot is arranged on the top of the filter box 3 near the exhaust gas collecting pipe 1, the pull-out box 32 is slidably arranged in the filter box 3 through the pull-out slot, one side of the pull-out box 32 is provided with a gas guiding hole communicated with the exhaust gas collecting pipe, the other side of the pull-out box 32 is arranged as an open type, the filter screen 31 is movably arranged in the open type of the pull-out box 32, a fixing sleeve 33 is arranged at the center of the filter screen 31, an end plate 34 is arranged on the fixing sleeve 33 near the gas guiding pipe 4, a guide rod 35 is slidably arranged in the fixing sleeve 33, a spring 36 is arranged between one end of the guide rod 35 and the end plate 34, a connecting plate is arranged at the other end of the guide rod 35, the connecting plate is arranged on the pull-out box 32 through fastening screws, a driving mechanism is arranged in the filter box 3 and slidably contacts with the end plate 34, a handle 37 is arranged on the top of the pull-out box 32, preferably, the driving mechanism comprises a first motor 38, a transmission shaft 39 and an eccentric wheel 310, a ball 311 is arranged on the surface of the end plate 34, the first motor 38 is arranged at the bottom of the filter box 3, the first motor 38 is a device used in the prior art, and a finished product can be directly purchased according to the used power, the transmission shaft 39 is vertically arranged in the filter box 3, and the lower end of the transmission shaft 39 is in transmission connection with the output shaft of the first motor 38, the eccentric wheel 310 is arranged at the upper end of the transmission shaft 39 and slidably contacts with the ball 311, when the exhaust gas enters into the filter assembly, the filter screen 31 can intercept and filter the particulate impurities carried in the exhaust gas, the filtered particulate impurities fall into the pull-out box 32, and the exhaust gas passes through the filter screen 31 and then enters into the desulfurization tank 2 through the gas guiding pipe 4, in the process that the filter screen 31 filters the exhaust gas again, the first motor 38 is started, the first motor 38 drives the transmission shaft 39 to rotate, the transmission shaft 9 can drive the eccentric wheel 310 to rotate in the process of rotating, the eccentric wheel 310 contacts with the ball 311 in the process of rotating, the ball 311 is impacted by the eccentric wheel 310, the ball 311 vibrates and drives the fixing sleeve 33 and the filter screen 31 to slide along the guide rod 35, at this time, the spring 36 is compressed, the fixing sleeve 33 and the filter screen 31 move towards the exhaust gas collecting pipe 3, after the eccentric wheel rotates and separates from the ball 11, the spring 36 in the compressed state drives the fixing sleeve 33 and the filter screen 31 to move back to the original position, the continuous rotation of the eccentric wheel 310 can drive the filter screen 31 to move back and forth, the back and forth moving filter screen 31 can filter the particulate impurities in the exhaust gas and collect the particulate impurities in the pull-out box 32, and the filter screen 31 in the back and forth moving state can effectively avoid the particulate impurities from being adhered and accumulated, thereby preventing the static accumulation and blockage, improving the filtering efficiency, when the collected particulate impurities need to be taken out and cleaned, the handle 37 is pulled upwards to drive the pull-out box 32 to move upwards, the pull-out box 32 can be taken out from the filter box, at this time, the particulate impurities pre-filtered and collected in the pull-out box 32 can be poured out and cleaned.The pull-out box 32 is reloaded into the filter box 3, and the use is convenient.

[0013] Preferably, in order to prevent the particles carried by the tail gas from escaping from the gap of the pull-out slot, a sealing ring 312 is arranged between the pull-out box 32 and the pull-out slot.

[0014] Further, the primary desulfurization assembly comprises a lower cone cover 22, an upper cone cover 23 and a primary desulfurization pipe 24, the lower cone cover 22 and the upper cone cover 23 are both structures with small upper end and large lower end, the upper cone cover 23 is located above the lower cone cover 22, the lower end of the lower cone cover 22 is sealingly connected with the inner wall of the desulfurization tank 2, a plurality of liquid distribution holes are uniformly arranged on the lower part of the lower cone cover 22 in a ring shape, the top of the upper cone cover 23 is provided with a mounting hole, one end of the primary desulfurization pipe 24 is connected with the alkali liquid conveying pipe 5, and the other end extends to below the upper cone cover 23 from the lower end of the lower cone cover 22 through the mounting hole, a gap is left between the lower end of the upper cone cover 23 and the inner wall of the desulfurization tank 2, when the tail gas enters below the primary desulfurization assembly, the alkali liquid flows upward through the primary desulfurization pipe 24, flows out from the top outlet of the primary desulfurization pipe 24, is intercepted and distributed by the upper cone cover 23, and is uniformly distributed on the surface of the lower cone cover 22 to form a water curtain, so that the tail gas entering between the upper cone cover 23 and the lower cone cover 22 can be subjected to spray desulfurization treatment, and preferably, a liquid distribution cone 25 with large upper end and small lower end is arranged on the bottom surface of the upper cone cover 23 above the primary desulfurization pipe 24, due to the blockage of the liquid distribution cone 25 to the upper end of the primary desulfurization pipe 24, the alkali liquid can be sprayed in an umbrella shape, and the effect of uniform distribution of the alkali liquid is improved.

[0015] Further, the secondary desulfurization assembly comprises a secondary desulfurization pipe 26 and a spray pipe 27. The secondary desulfurization pipe 26 is horizontally installed in the desulfurization tank 2. One end of the secondary desulfurization pipe 26 is communicated with the alkali conveying pipe 5, and the other end is sealed by a sealing plate. Short pipes are arranged at the bottom of the secondary desulfurization pipe 26 in the desulfurization tank 2 at equal intervals. The spray pipe is installed at the lower end of the short pipe through a rotary joint 28. A driving mechanism for driving the spray pipe 27 to rotate is arranged in the desulfurization tank 2. Atomizing nozzles are installed at the lower end of the spray pipe 27. Preferably, the driving mechanism comprises a protective shell 29, a transmission worm 210 and a worm wheel 211. The protective shell 29 is installed on the inner wall of the desulfurization tank 2. The spray pipe 27 penetrates the protective shell 29. The worm wheel 211 is installed on the outer wall of the spray pipe 27 in the protective shell 29. The transmission worm 210 is rotatably installed in the protective shell 29 and is in meshing connection with the worm wheel 211. A second motor 212 in driving connection with the transmission worm 210 is arranged outside the desulfurization tank 2. The second motor 212 is a structure used in the prior art. When the tail gas enters the lower part of the secondary desulfurization assembly, the alkali in the secondary desulfurization pipe 26 enters the spray pipe 27. At this time, the second motor 212 is started. The second motor 212 drives the transmission worm 210 to rotate. The meshing of the worm wheel 211 and the transmission worm 210 can drive the worm wheel 211 to rotate, thereby driving the spray pipe 27 and the atomizing nozzles to rotate. The atomizing nozzles are used to spray the alkali to each position in the desulfurization tank 2. At this time, the rising flue gas will be in contact with the alkali solution. The sulfides in the flue gas and the alkaline substances in the solution will fully react, thereby realizing flue gas desulfurization. The driving mechanism is used to drive the spray pipe 27 and the atomizing nozzles to rotate, so that the range of liquid alkali spraying is realized. The spraying in each corner of the desulfurization tank 2 can significantly improve the desulfurization effect.

Claims

1. A desulfurization and purification system for tail gas from refractory brick production, comprising a tail gas collection pipe (1) and a desulfurization tank (2), characterized in that: The outlet of the tail gas collecting pipe (1) is provided with a filter box (3), a filter assembly is detachably installed in the filter box (3), an air guide pipe (4) extending to communicate with the desulfurization tank (2) is provided on the filter box (3), the air guide pipe (4) is arranged in an inclined downward direction in the desulfurization tank (2), and a first-stage desulfurization assembly, a second-stage desulfurization assembly and a gas-liquid separation plate (21) are sequentially arranged from bottom to top in the desulfurization tank (2) above the outlet of the air guide pipe (4), and an alkali liquid delivery pipe (5) is provided on the outside of the desulfurization tank (2) and is communicated with the first-stage desulfurization assembly and the second-stage desulfurization assembly. ), a liquid inlet valve (51) and a pressure pump (52) are sequentially provided on the alkali solution delivery pipe (5) along the liquid flow direction, a liquid discharge pipe (6) is provided at the bottom of the desulfurization tank (2), the outlet of the liquid discharge pipe (6) is connected to a recovery tank (7), a circulation pipe (8) connected to the alkali solution delivery pipe (5) is provided on the recovery tank (7), a circulation pump is provided on the circulation pipe (8), an exhaust pipe (9) is provided on the top of the desulfurization tank (2), a sewage pipe (10) is provided on the recovery tank (7), and a sewage valve is provided on the sewage pipe (10).

2. A desulfurization and purification system for tail gas from refractory brick production according to claim 1, characterized in that: The filter assembly includes a filter screen (31) and a pull-out box (32). A pull-out groove is provided on the top of the filter box (3) near the exhaust gas collection pipe 1. The pull-out box (32) is slidably installed in the filter box (3) through the pull-out groove. An air guide hole connected to the exhaust gas collection pipe is provided on one side of the pull-out box (32). The other side of the pull-out box (32) is open. The filter screen (31) is movably installed at the open part in the pull-out box (32). A fixed sleeve (33) is installed through the center of the filter screen (31). An end plate (34) is installed on the fixed sleeve (33) on the side of the near air duct (4), and a guide rod (35) is slidably installed in the fixed sleeve (33). A spring (36) is installed between one end of the guide rod (35) and the end plate (34). A connecting plate is installed on the other end of the guide rod (35), and the connecting plate is installed on the pull-out box (32) by fastening screws. A driving mechanism that is in sliding contact with the end plate (34) is provided in the filter box (3), and a handle (37) is provided on the top of the pull-out box (32).

3. A desulfurization and purification system for tail gas from refractory brick production according to claim 2, characterized in that: The driving mechanism comprises a first motor (38), a transmission shaft (39) and an eccentric wheel (310); a ball bearing (311) is nested and installed on the surface of the end plate (34); the first motor (38) is installed at the bottom of the filter box (3); the transmission shaft (39) is vertically installed in the filter box (3), and the lower end of the transmission shaft (39) is in transmission connection with the output shaft of the first motor (38); the eccentric wheel (310) is installed at the upper end of the transmission shaft (39) and is in sliding contact with the ball bearing (311).

4. A desulfurization and purification system for tail gas from refractory brick production according to claim 2, characterized in that: A sealing ring (312) is provided between the drawer box (32) and the drawer slot.

5. The desulfurization and purification system for tail gas from refractory brick production according to claim 1, characterized in that: The first-stage desulfurization assembly comprises a lower cone cover (22), an upper cone cover (23) and a first-stage desulfurization pipe (24). The lower cone cover (22) and the upper cone cover (23) are both structures with a small upper end and a large lower end. The upper cone cover (23) is located above the lower cone cover (22). The lower end of the lower cone cover (22) is sealedly connected to the inner wall of the desulfurization tank (2). The lower part of the lower cone cover (22) is uniformly distributed with a plurality of liquid distribution holes in an annular direction. The top of the upper cone cover (23) is provided with a mounting hole. One end of the first-stage desulfurization pipe (24) is connected to the alkali solution delivery pipe (5), and the other end extends from the lower end of the lower cone cover (22) through the mounting hole to the bottom of the upper cone cover (23). A gap is left between the lower end of the upper cone cover (23) and the inner wall of the desulfurization tank (2).

6. A desulfurization and purification system for tail gas from refractory brick production according to claim 5, characterized in that: A liquid distribution cone (25) with a larger upper end and a smaller lower end is provided on the bottom surface of the upper cone cover (23) above the first-stage desulfurization pipe (24).

7. The desulfurization and purification system for tail gas from refractory brick production according to claim 1, characterized in that: The secondary desulfurization assembly comprises a secondary desulfurization pipe (26) and a spray pipe (27). The secondary desulfurization pipe (26) is horizontally installed in the desulfurization tank (2). One end of the secondary desulfurization pipe (26) is connected to the alkali solution delivery pipe (5), and the other end is sealed by a sealing plate. Short pipes are arranged at equal intervals at the bottom of the secondary desulfurization pipe (26) located in the desulfurization tank (2). The spray pipe is installed at the lower end of the short pipe through a rotary joint (28). A transmission mechanism for driving the spray pipe (27) to rotate is provided in the desulfurization tank (2), and an atomizing nozzle is installed at the lower end of the spray pipe (27).

8. A desulfurization and purification system for tail gas from refractory brick production according to claim 7, characterized in that: The transmission mechanism comprises a protective shell (29), a transmission worm (210) and a worm wheel (211); the protective shell (29) is mounted on the inner wall of the desulfurization tank (2); the spray pipe (27) is arranged to pass through the protective shell (29); the worm wheel (211) is mounted on the outer wall of the spray pipe (27) located in the protective shell (29); the transmission worm (210) is rotatably mounted in the protective shell (29) and is meshed with the worm wheel (211); and a second motor (212) is provided on the outer side of the desulfurization tank (2) and is transmission-connected to the transmission worm (210).

Images