High-temperature tail gas and smoke dust treatment device for molybdenum oxide rotary kiln

Abstract

The utility model discloses a molybdenum oxide rotary kiln high-temperature tail gas smoke dust treatment device which comprises a fresh air heat exchanger connected to one end of a smoke exhaust pipe of a rotary kiln, a smoke outlet end of the fresh air heat exchanger is connected with a cyclone dust collector, and one end of a fan air outlet of the cyclone dust collector is connected with a convection type heat exchange assembly. The utility model relates to the technical field of molybdenum oxide rotary kiln tail gas treatment, high-temperature waste heat in tail gas is utilized to preheat fresh air used by a rotary kiln, the temperature of the fresh air is increased, and then the combustion efficiency of the rotary kiln is improved. The cooled tail gas further enters a cyclone dust collector, large-particle dust in the flue gas is settled in the cyclone dust collector under the driving action of spiral airflow, and after further heat exchange is carried out on the flue gas subjected to primary dust removal, deep purification of the tail gas is achieved in cooperation with a spraying purification assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment of a molybdenum oxide rotary kiln, in particular to a high-temperature tail gas and smoke treatment device of a molybdenum oxide rotary kiln. Background Art

[0002] At present, most of the industrial molybdenum oxide production in my country uses rotary kilns and multi-chamber furnaces for roasting. Due to the high cost of multi-chamber furnaces, small and medium-sized enterprises generally use rotary kilns. When using rotary kilns for production, a large amount of waste gas containing smoke and dust will be generated, which not only pollutes the environment, but also endangers the health of workers. The existing waste gas treatment device for the production of molybdenum oxide usually sets a settling chamber outside the rotary kiln to remove dust from the generated waste gas. Multiple settling baffles are staggered in the settling chamber, and a flow gap is reserved between the settling baffle and the bottom of the box. After the dust-containing waste gas enters the box, it is blocked by the settling baffle and flows forward through the flow gap, so that the smoke and dust particles in the dust-containing waste gas naturally settle with the help of gravity to achieve the purpose of purifying the gas; this waste gas treatment device has a relatively single function, and it is difficult to settle and filter the small particles carried in the waste gas, and the dust removal effect is average. In addition, due to the high temperature of the exhaust gas from the rotary kiln, direct discharge causes a lot of resource waste. In view of this, in-depth research on the above problems has been carried out, and this case has been produced. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a high-temperature tail gas and smoke treatment device for a molybdenum oxide rotary kiln, which solves the problems raised in the background technology.

[0004] To achieve the above purpose, the utility model is implemented through the following technical solutions: a high-temperature tail gas and dust treatment device of a molybdenum oxide rotary kiln furnace, comprising a fresh air heat exchanger connected to one end of a rotary kiln furnace exhaust pipe, the smoke outlet end of the fresh air heat exchanger is connected to a cyclone dust collector, one end of the fan exhaust port of the cyclone dust collector is connected to a convection heat exchange component, one end of the convection heat exchange component is connected to a deep purification bin, the top of the deep purification bin is connected to the flue, a spray purification component is arranged in the deep purification bin, and one end of the spray purification component is connected to a purification liquid storage bin;

[0005] The convection heat exchange component includes a heat exchange silo, sealing plates are symmetrically arranged on the inner sides of both ends of the heat exchange silo, heat exchange copper tubes are evenly arranged along a circular array between the sealing plates, the heat exchange copper tubes and the sealing plates are assembled and fixed by sealing joints, conical sleeves are connected to the outer sides of both ends of the heat exchange silo, and water pipe interfaces are respectively arranged on the upper and lower sides of the heat exchange silo, and the water pipe interfaces are connected to the refrigerant supply component.

[0006] The above-mentioned refrigerant supply assembly includes a water tank, a water pump, a water supply pipe and a return pipe. The water inlet end of the water pump is connected to the water tank, one end of the water supply pipe is connected to the water outlet end of the water pump, and the other end is connected to the water pipe interface located at the bottom; one end of the return pipe is connected to the water pipe interface located at the top, and the other end is connected to the boiler water tank.

[0007] The above-mentioned spray purification assembly includes a mounting seat, an annular tube, a spray head and a booster pump. The mounting seat is arranged in the deep purification chamber, the annular tube is arranged on the mounting seat, the spray head is arranged on the lower side wall of the annular tube along an annular array, the liquid inlet end of the booster pump is connected to the purification liquid storage chamber, and the booster discharge end is connected to the annular tube.

[0008] The bottom of the deep purification bin is a water collecting bucket, the air outlet end of the heat exchange silo is connected with an air duct, and the air outlet end of the air duct extends into the deep purification bin.

[0009] The annular tubes and the sprinkler heads are arranged in multiple layers in the vertical direction.

[0010] The jacket inlet of the fresh air heat exchanger is connected to the fresh air supply pipeline, and the jacket outlet is connected to the combustion chamber air inlet pipeline.

[0011] The utility model provides a high-temperature tail gas and dust treatment device for a molybdenum oxide rotary kiln. It has the following beneficial effects: in the molybdenum oxide rotary kiln high-temperature tail gas and dust treatment device, during the molybdenum oxide calcining operation, the high-temperature flue gas generated in the rotary kiln first enters the fresh air heat exchanger through the rotary kiln exhaust pipe, and the high-temperature waste heat in the tail gas is used to preheat the fresh air used by the rotary kiln, thereby increasing the fresh air temperature and thus improving the combustion efficiency of the rotary kiln. The tail gas after cooling further enters the cyclone dust collector, and under the driving effect of the spiral wind flow, the large particles of dust in the flue gas are settled in the cyclone dust collector. After the preliminary dust removal, the flue gas further enters the convection heat exchange component, and after further exchanging the heat in the tail gas, the tail gas is introduced into the deep purification chamber, and the spray purification component is used to achieve deep purification of the tail gas, thereby reducing the dust content in the tail gas to the greatest extent. The structure is simple and the operation is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the main structure of a high-temperature tail gas and smoke treatment device for a molybdenum oxide rotary kiln described in the utility model.

[0013] Figure 2 It is a schematic cross-sectional structural diagram of the countercurrent heat exchange component of the utility model.

[0014] Figure 3 For this utility model Figure 1 Schematic diagram of the local enlarged structure at position a.

[0015] In the figure: 1. Rotary kiln exhaust pipe; 2. Fresh air heat exchanger; 3. Cyclone dust collector; 4. Deep purification chamber; 5. Flue; 6. Purification liquid storage chamber; 7. Heat exchange silo; 8. Sealing plate; 9. Heat exchange copper pipe; 10. Sealing joint; 11. Conical sleeve; 12. Water pipe interface; 13. Water tank; 14. Water pump; 15. Water supply pipe; 16. Return pipe; 17. Boiler water tank; 18. Mounting seat; 19. Ring pipe; 20. Sprinkler head; 21. Booster pump; 22. Water collecting bucket; 23. Air duct. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] Embodiment: In conjunction with the specification Figure 1-3It can be seen that this scheme is to solve the problems in the prior art that the exhaust gas treatment device has a relatively single function, and it is difficult to settle and filter the small particles carried in the exhaust gas, and the dust removal effect is general. In addition, due to the high temperature of the rotary kiln exhaust gas, direct discharge causes a lot of resource waste. A molybdenum oxide rotary kiln high-temperature exhaust gas and smoke treatment device is specifically designed, including a fresh air heat exchanger 2 connected to one end of the rotary kiln exhaust pipe 1, the smoke outlet end of the fresh air heat exchanger 2 is connected to a cyclone dust collector 3, and the jacket inlet of the fresh air heat exchanger 2 It is connected to the fresh air supply pipeline, and the jacket outlet is connected to the combustion chamber air inlet pipeline, wherein one end of the fan exhaust port of the cyclone dust collector 3 is connected to a convection heat exchange component, one end of the convection heat exchange component is connected to a deep purification bin 4, the top of the deep purification bin 4 is connected to the flue 5, a spray purification component is arranged in the deep purification bin 4, and one end of the spray purification component is connected to a purification liquid storage bin 6; wherein the convection heat exchange component includes a heat exchange silo 7, and sealing plates 8 are symmetrically arranged on the inner sides of both ends of the heat exchange silo 7, and the sealing plates 8 are arranged along an annular The array is evenly arranged with heat exchange copper tubes 9, which are assembled and fixed to the sealing plate 8 by sealing joints 10. Conical sleeves 11 are connected to the outer sides of both ends of the heat exchange silo 7. Water pipe interfaces 12 are respectively provided on the upper and lower sides of the heat exchange silo 7. The water pipe interfaces 12 are connected to the refrigerant supply assembly. During the calcination of molybdenum oxide, the high-temperature flue gas generated in the rotary kiln first passes through the rotary kiln exhaust pipe 1 and enters the fresh air heat exchanger 2. The high-temperature waste heat in the tail gas is used to preheat the fresh air used by the rotary kiln to improve the efficiency. The temperature of fresh air is increased, thereby improving the combustion efficiency of the rotary kiln. The cooled exhaust gas further enters the cyclone dust collector 3. Driven by the spiral wind flow, large particles of dust in the flue gas are settled in the cyclone dust collector 3. The flue gas after preliminary dust removal further enters the convection heat exchange component. After further exchange of heat in the exhaust gas, the exhaust gas is introduced into the deep purification chamber 4, and the spray purification component is used to achieve deep purification of the exhaust gas, thereby reducing the dust content in the exhaust gas to the greatest extent. The structure is simple and the operation is reliable.

[0018] In the specific implementation process, the above-mentioned refrigerant supply component includes a water tank 13, a water pump 14, a water supply pipe 15 and a return pipe 16. The water inlet end of the water pump 14 is connected to the water tank 13, one end of the water supply pipe 15 is connected to the water outlet end of the water pump 14, and the other end is connected to the water pipe interface 12 located at the bottom. One end of the return pipe 16 is connected to the water pipe interface 12 located at the top, and the other end is connected to the boiler water tank 17. When in use, the low-temperature water in the water tank 13 is extracted by the water pump 14, and is injected into the heat exchange silo 7 through the water pipe joint at the bottom of the heat exchange silo 7, and heat is exchanged with the hot air in the heat exchange copper tube 9 in the heat exchange silo 7. The water after heat exchange is supplied to the boiler water tank 17 through the water pipe joint at the top of the heat exchange silo 7 and the return pipe.

[0019] In the specific implementation process, the above-mentioned spray purification assembly includes a mounting seat 18, an annular tube 19, a spray head 20 and a booster pump 21. The mounting seat 18 is arranged in the deep purification bin 4, the annular tube 19 is arranged on the mounting seat 18, and the spray head 20 is arranged on the lower side wall of the annular tube 19 along the annular array. The liquid inlet end of the booster pump 21 is connected to the purified liquid storage bin 6, and the booster discharge end is connected to the annular tube 19. The bottom of the deep purification bin 4 is a water collecting bucket 22, and the heat exchange silo 7 is connected to the bottom of the deep purification bin 4. The air outlet end is connected to an induced draft duct 23, and the air outlet end of the induced draft duct 23 extends into the deep purification chamber 4. The annular tube 19 and the spray head 20 are arranged in multiple layers in the vertical direction. When in use, the booster pump 21 is started, and the purifier in the purification liquid storage chamber 6 is pressurized by the booster pump 21 and injected into the annular tube 19, and further under the action of the water head pressure, the purifier is sprayed out through the spray head 20 to spray and purify the exhaust gas, thereby adsorbing and intercepting the fine dust particles in the exhaust gas.

[0020] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature tail gas and dust treatment device for a molybdenum oxide rotary kiln, comprising a fresh air heat exchanger connected to one end of a rotary kiln exhaust pipe, wherein a cyclone dust collector is connected to the smoke outlet end of the fresh air heat exchanger, characterized in that: One end of the fan exhaust port of the cyclone dust collector is connected to a convection heat exchange component, one end of the convection heat exchange component is connected to a deep purification bin, the top of the deep purification bin is connected to the flue, a spray purification component is arranged in the deep purification bin, and one end of the spray purification component is connected to a purification liquid storage bin; The convection heat exchange component includes a heat exchange silo, sealing plates are symmetrically arranged on the inner sides of both ends of the heat exchange silo, heat exchange copper tubes are evenly arranged along a circular array between the sealing plates, the heat exchange copper tubes and the sealing plates are assembled and fixed by sealing joints, conical sleeves are connected to the outer sides of both ends of the heat exchange silo, and water pipe interfaces are respectively arranged on the upper and lower sides of the heat exchange silo, and the water pipe interfaces are connected to the refrigerant supply component.

2. The high-temperature tail gas and dust treatment device of a molybdenum oxide rotary kiln according to claim 1 is characterized in that: The refrigerant supply assembly includes a water tank, a water pump, a water supply pipe and a return pipe. The water inlet end of the water pump is connected to the water tank, one end of the water supply pipe is connected to the water outlet end of the water pump, and the other end is connected to the water pipe interface located at the bottom; one end of the return pipe is connected to the water pipe interface located at the top, and the other end is connected to the boiler water tank.

3. The high-temperature tail gas and dust treatment device of a molybdenum oxide rotary kiln according to claim 1 is characterized in that: The spray purification assembly includes a mounting seat, an annular tube, a spray head and a booster pump. The mounting seat is arranged in a deep purification chamber, the annular tube is arranged on the mounting seat, the spray head is arranged on the lower side wall of the annular tube along an annular array, the liquid inlet end of the booster pump is connected to the purification liquid storage chamber, and the booster discharge end is connected to the annular tube.

4. A molybdenum oxide rotary kiln high temperature tail gas and smoke treatment device according to claim 3, characterized in that: The bottom of the deep purification bin is a water collecting bucket, the air outlet end of the heat exchange silo is connected with an air induced draft duct, and the air outlet end of the air induced draft duct extends into the deep purification bin.

5. The high-temperature tail gas and dust treatment device of a molybdenum oxide rotary kiln according to claim 3 is characterized in that: The annular pipes and the spray heads are arranged in multiple layers in the vertical direction.

6. The high-temperature tail gas and dust treatment device of a molybdenum oxide rotary kiln according to claim 1 is characterized in that: The jacket inlet of the fresh air heat exchanger is connected to the fresh air supply pipeline, and the jacket outlet is connected to the combustion chamber air inlet pipeline.

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