Mineral powder production tail gas recycling system

Abstract

The utility model provides a mineral powder production tail gas recycling system which comprises a main exhaust fan exhaust air pipe, a power generation air pipe, a power generation exhaust air pipe and a main exhaust chimney, and at least one wind generating set is installed on the power generation air pipe. Tail gas with certain air volume, air speed and air pressure exhausted by the exhaust air pipe of the main exhaust fan is introduced into the power generation air pipe, wind energy carried by the tail gas is converted into electric energy through the multiple wind generating sets installed on the power generation air pipe, and the electric energy is returned to the low-voltage power supply system again and used for supplying power to mineral powder production low-voltage equipment. And the electric energy required by production and the processing cost are reduced, the production carbon emission is also reduced, the energy recycling of the tail gas is realized, and the problem of air pollution caused by emission is also solved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy reuse, in particular to a system for recycling the tail gas in mineral powder production. Background Art

[0002] In the production and processing of mineral powder, a large amount of hot air is used to dry the raw material water slag while grinding is carried out synchronously, and finally mineral powder is produced. During this process, the tail gas generated after drying is mainly a mixed gas containing nitrogen oxides, nitrogen dioxide, water vapor, etc. at 80 - 110°C, and this gas cannot be burned continuously.

[0003] At present, the energy-saving utilization technology of the tail gas in mineral powder production mainly uses the negative pressure principle of the vertical mill and the main exhaust fan to use part of the hot air discharged by the main exhaust fan as circulating air, and mixes it with the hot air generated by the hot blast stove to dry the raw material water slag, so as to achieve the purpose of energy saving by reducing heat consumption; because the tail gas in mineral powder production contains water vapor, it is impossible to recycle all the tail gas in mineral powder production, and the remaining tail gas can only be discharged from a high place through the chimney to meet the environmental protection emission requirements. This part of the tail gas has a certain air volume, wind speed, wind pressure and heat, and directly discharging it into the atmosphere will cause a certain amount of energy waste. Summary of the Utility Model

[0004] The utility model provides a system for recycling the tail gas in mineral powder production, which solves the problems such as low recycling rate of the tail gas in mineral powder production in the prior art.

[0005] The technical solution of the utility model is realized as follows:

[0006] The utility model provides a system for recycling the tail gas in mineral powder production, which includes a main exhaust fan discharge air duct, a power generation air duct, a power generation discharge air duct and a main exhaust chimney, and at least one wind power generation set is installed on the power generation air duct.

[0007] The utility model introduces the tail gas with a certain air volume, wind speed and wind pressure discharged from the main exhaust fan discharge air duct into the power generation air duct, and uses multiple wind power generation sets installed on the power generation air duct to convert the wind energy carried by the tail gas into electric energy. The electric energy is returned to the low-voltage power supply system and used to supply power to the low-voltage equipment in mineral powder production. This not only reduces the electric energy required for production and processing costs, but also reduces the carbon emissions during production. It not only realizes the energy recovery and reuse of the tail gas, but also solves the problem of air pollution caused by emissions.

[0008] Preferably, the main exhaust fan discharge air duct is connected to the power generation air duct through a booster pipe, and the inner diameter of the booster pipe gradually decreases along the tail gas discharge direction. By setting the booster pipe, the wind speed of the tail gas entering the wind power generation set can be increased, thereby improving the wind power generation efficiency.

[0009] Preferably, the power generation exhaust air duct is connected to the main exhaust chimney through a silencer, and the silencer can be a reducer pipe. The inner diameter of the reducer pipe gradually increases along the exhaust gas discharge direction, and the exhaust gas velocity passing through the reducer pipe will gradually decrease, thereby reducing noise.

[0010] Preferably, a cyclone separator is installed at the front end of the power generation air duct, and an overflow valve is provided at the bottom of the cyclone separator. By installing a cyclone separator at the front end of the power generation air duct, the cyclone separator can be used to dehydrate and dedust the exhaust gas. On the one hand, it reduces the wear of the exhaust gas on the wind turbine generator set, and on the other hand, it makes the exhaust gas discharge more environmentally friendly; the overflow valve at the bottom of the cyclone separator can automatically overflow and drain water after dehydrating the exhaust gas.

[0011] Specifically, the wind turbine generator set includes a diversion box. Air inlets and air outlets are respectively provided on both side walls of the diversion box. A rotating shaft is rotatably installed inside the diversion box through a bearing, and wind turbine blades are installed on the rotating shaft; one end of the rotating shaft passes through the outer wall of the diversion box and is connected to the power input shaft of the generator. The exhaust gas treated by the cyclone separator enters the diversion box from the air inlet and exits from the outlet. After the exhaust gas enters the diversion box, it pushes the wind turbine blades to rotate at a high speed, and the wind turbine blades drive the rotating shaft to rotate, thereby driving the generator to generate electricity.

[0012] Further, the end of the rotating shaft is connected to the input end of a speed increaser, and the output end of the speed increaser is connected to the power input shaft of the generator. By installing a speed increaser between the rotating shaft and the power input shaft of the generator, the rotation speed of the generator can be further increased, thereby improving the power generation efficiency.

[0013] Preferably, the outlet of the main exhaust fan exhaust air duct is communicated with the side wall of the main exhaust chimney, and the inlet of the power generation air duct is communicated with the side wall of the main exhaust chimney; a first safety relief valve is installed in the main exhaust chimney, and the first safety relief valve is located between the outlet of the main exhaust fan exhaust air duct and the outlet of the power generation exhaust air duct; an intake valve is installed at the inlet of the power generation air duct; by installing the first safety relief valve, when the exhaust gas pressure and air volume discharged from the main exhaust fan exhaust air duct are overloaded, the first safety relief valve automatically opens to avoid damage to the power generation air duct due to overload and plays a safety protection role; by installing the intake valve, it is convenient to repair the power generation air duct.

[0014] Preferably, a tee joint is installed at the outlet of the power generation air duct. One outlet of the tee joint is connected to the power generation exhaust air duct, and the other outlet is connected to a circulation air duct. The outlet of the circulation air duct is connected to the mixing air chamber; by connecting a circulation air duct at the outlet of the power generation air duct, the exhaust gas discharged from the power generation air duct can be sent into the mixing air chamber through the circulation air duct to be mixed with the hot air generated by the hot blast stove, fully utilizing the heat energy in the exhaust gas, realizing further recycling of the exhaust gas, and further improving the utilization rate of the exhaust gas.

[0015] Further, a second safety relief valve is installed at the front end of the power generation exhaust air duct, and a third safety relief valve is installed at the front end of the circulation air duct. By installing the second safety relief valve, it is convenient to repair the power generation exhaust air duct, and by installing the third safety relief valve, it is convenient to repair the circulation air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the pipeline connection structure of a tail gas recycling system for mineral powder production according to the present invention;

[0018] Figure 2 It is a schematic diagram of the internal structure of the drainage box in the embodiment of the present invention;

[0019] Figure 3 It is a schematic diagram of the side structure of the drainage box in the embodiment of the present invention;

[0020] In the figure: 1, main exhaust fan exhaust air duct; 2, power generation air duct; 3, power generation exhaust air duct; 4, main exhaust chimney; 5, booster pipe; 6, silencer; 7, cyclone separator; 8, overflow valve; 9, drainage box; 10, air inlet; 11, air outlet; 12, bearing; 13, rotating shaft; 14, wind wheel blade; 15, generator; 16, speed increaser; 17, first safety relief valve; 18, intake valve; 19, circulation air duct; 20, mixed air chamber; 21, second safety relief valve; 22, third safety relief valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0022] Refer to Figure 1 , the embodiment of the present invention provides a tail gas recycling system for mineral powder production, including a main exhaust fan exhaust air duct 1, a power generation air duct 2, a power generation exhaust air duct 3 and a main exhaust chimney 4. At least one wind power generation unit is installed on the power generation air duct 2.

[0023] In this utility model, the tail gas with a certain air volume, wind speed, and wind pressure discharged from the main exhaust fan discharge duct 1 is introduced into the power generation duct 2. Multiple wind power generation sets installed on the power generation duct 2 convert the wind energy carried by the tail gas into electric energy, and the electric energy is returned to the low-voltage power supply system to supply power to the low-voltage equipment for mineral powder production. This not only reduces the electric energy required for production and processing costs, but also reduces the carbon emissions during production. It not only realizes the energy recovery and reuse of the tail gas, but also solves the problem of air pollution caused by emissions.

[0024] In this embodiment, 3 wind power generation sets are connected in series on the power generation duct 2 to drive power generation at different wind speeds, making full use of the wind energy carried by the tail gas.

[0025] Preferably, the main exhaust fan discharge duct 1 and the power generation duct 2 are connected through a booster pipe 5. The inner diameter of the booster pipe 5 gradually decreases along the tail gas discharge direction. By setting the booster pipe 5, the wind speed of the tail gas entering the wind power generation set can be increased, thereby improving the wind power generation efficiency.

[0026] Preferably, the power generation discharge duct 3 and the main exhaust chimney 4 are connected through a silencer 6. The silencer 6 can adopt a variable-diameter pipe, and the inner diameter of the variable-diameter pipe gradually increases along the tail gas discharge direction. The wind speed of the tail gas passing through the variable-diameter pipe will gradually decrease, thereby reducing noise.

[0027] Preferably, a cyclone separator 7 is installed at the front end of the power generation duct 2, and an overflow valve 8 is provided at the bottom of the cyclone separator 7. By installing the cyclone separator 7 at the front end of the power generation duct 2, the cyclone separator 7 can be used to dehydrate and deash the tail gas. On the one hand, it reduces the wear of the tail gas on the wind power generation set, and on the other hand, it makes the tail gas discharge more environmentally friendly; the overflow valve 8 at the bottom of the cyclone separator 7 can automatically overflow and drain water after dehydrating the tail gas.

[0028] Specifically, the wind power generation set includes a diversion box 9. Air inlets 10 and air outlets 11 are respectively provided on both side walls of the diversion box 9. A rotating shaft 13 is rotatably installed inside the diversion box 9 through a bearing 12, and wind turbine blades 14 are installed on the rotating shaft 13; one end of the rotating shaft 13 passes through the outer wall of the diversion box 9 and is connected to the power input shaft of the generator 15. The tail gas processed by the cyclone separator 7 enters the diversion box 9 from the air inlet 10 and exits from the outlet. After the tail gas enters the diversion box 9, it pushes the wind turbine blades 14 to rotate at a high speed, and the wind turbine blades 14 drive the rotating shaft 13 to rotate, thereby driving the generator 15 to generate electricity.

[0029] Further, the end of the rotating shaft 13 is connected to the input end of the speed increaser 16, and the output end of the speed increaser 16 is connected to the power input shaft of the generator 15 (simply install the speed reducer in reverse). By installing the speed increaser 16 between the rotating shaft 13 and the power input shaft of the generator 15, the rotation speed of the generator 15 can be further increased, thereby improving the power generation efficiency.

[0030] Preferably, the outlet of the main exhaust fan discharge air duct 1 is communicated with the side wall of the main exhaust chimney 4, and the inlet of the power generation air duct 2 is communicated with the side wall of the main exhaust chimney 4; a first safety relief valve 17 is installed in the main exhaust chimney 4, and the first safety relief valve 17 is located between the outlet of the main exhaust fan discharge air duct 1 and the outlet of the power generation discharge air duct 3; an intake valve 18 is installed at the inlet of the power generation air duct 2; by installing the first safety relief valve 17, when the exhaust gas pressure and air volume discharged from the main exhaust fan discharge air duct 1 are overloaded, the first safety relief valve 17 automatically opens to avoid overloading and damage of the power generation air duct 2, playing a safety protection role; by installing the intake valve 18, it is convenient to repair the power generation air duct 2.

[0031] In this embodiment, the inner diameter of the main exhaust chimney 4 is 3 m, the inner diameter of the inlet of the booster pipe 5 is 2 m, and the inner diameter of the outlet is 1 m; the inner diameter of the inlet of the reducer pipe is 1 m, and the inner diameter of the outlet is 2 m.

[0032] Preferably, a tee joint is installed at the outlet of the power generation air duct 2. One outlet of the tee joint is connected to the power generation discharge air duct 3, and the other outlet is connected to a circulating air duct 19. The outlet of the circulating air duct 19 is connected to the mixing air chamber 20; by connecting the circulating air duct 19 at the outlet of the power generation air duct 2, the exhaust gas discharged from the power generation air duct 2 can be sent into the mixing air chamber 20 through the circulating air duct 19 to be mixed with the hot air generated by the hot blast stove, making full use of the heat energy in the exhaust gas, realizing further recycling of the exhaust gas, and further improving the utilization rate of the exhaust gas.

[0033] Further, a second safety relief valve 21 is installed at the front end of the power generation discharge air duct 3, and a third safety relief valve 22 is installed at the front end of the circulating air duct 19. By installing the second safety relief valve 21, it is convenient to repair the power generation discharge air duct 3. By installing the third safety relief valve 22, it is convenient to repair the circulating air duct 19.

[0034] The working process of the exhaust gas recycling system in this embodiment is as follows:

[0035] First, close the first safety relief valve 17, open the intake valve 18, the second safety relief valve 21 and the third safety relief valve 22. After the tail gas discharged from the main exhaust fan discharge duct 1 enters the booster pipe 5 through the main exhaust chimney 4, the wind speed and wind pressure of the tail gas are increased. After the boosted tail gas is treated by the cyclone separator 7, most of the dust and moisture in the tail gas are removed. Then, it passes through the three-stage wind power generation unit in sequence, converting the wind energy carried in the tail gas into the mechanical energy of the wind turbine blades 14, and further into electrical energy for powering the low-voltage equipment in ore powder production. The tail gas after the three-stage wind power generation unit absorbs the wind energy is divided into two paths. One path enters the mixing air chamber 20 through the circulating air duct 19 for reuse, and the other path enters the muffler 6 through the power generation discharge duct 3. The wind speed of the tail gas decreases as the inner diameter of the muffler 6 increases, thereby reducing the noise of the tail gas discharge. The tail gas discharged from the muffler 6 finally enters the atmosphere through the main exhaust chimney 4.

[0036] When the air pressure in the power generation air duct 2 reaches the preset safety threshold, the first safety relief valve 17 automatically opens. The tail gas discharged from the main exhaust fan discharge duct 1 is divided into two paths. One path directly enters the atmosphere through the main exhaust chimney 4, and the other path enters the power generation air duct 2 through the booster pipe 5 for power generation, thereby reducing the air pressure in the power generation air duct 2 and ensuring the safety of the power generation air duct 2.

[0037] When it is necessary to repair the power generation air duct 2, the first safety relief valve 17 can be opened and the intake valve 18 can be closed. All the tail gas discharged from the main exhaust fan discharge duct 1 enters the atmosphere through the main exhaust chimney 4, and the power generation air duct 2 can be directly repaired. When it is necessary to repair the power generation discharge duct 3, the second safety relief valve 21 can be closed, and all the tail gas discharged from the power generation air duct 2 will enter the mixing air chamber 20 through the circulating air duct 19, and the power generation discharge duct 3 can be directly repaired. When it is necessary to repair the circulating air duct 19, the third safety relief valve 22 can be closed, and all the tail gas discharged from the power generation air duct 2 will enter the main exhaust chimney 4 through the power generation discharge duct 3, and the circulating air duct 19 can be directly repaired.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tail gas recycling system for mineral powder production, characterized in that, It includes a main exhaust fan discharge duct (1), a power generation duct (2), a power generation discharge duct (3) and a main exhaust chimney (4). At least one wind power generation unit is installed on the power generation duct (2). The outlet of the main exhaust fan discharge duct (1) is communicated with the side wall of the main exhaust chimney (4), and the inlet of the power generation duct (2) is communicated with the side wall of the main exhaust chimney (4). A first safety relief valve (17) is installed in the main exhaust chimney (4), and the first safety relief valve (17) is located between the outlet of the main exhaust fan discharge duct (1) and the outlet of the power generation discharge duct (3). An intake valve (18) is installed at the inlet of the power generation duct (2).

2. The tail gas recycling system for mineral powder production according to claim 1, characterized in that The main exhaust fan discharge duct (1) is connected to the power generation duct (2) through a booster pipe (5), and the inner diameter of the booster pipe (5) gradually decreases along the exhaust gas discharge direction.

3. The tail gas recycling system for mineral powder production according to claim 1, wherein The power generation discharge duct (3) is connected to the main exhaust chimney (4) through a silencer (6).

4. The tail gas recycling system for mineral powder production according to claim 1, characterized in that, A cyclone separator (7) is installed at the front end of the power generation duct (2), and an overflow valve (8) is provided at the bottom of the cyclone separator (7).

5. The tail gas recycling system for mineral powder production according to claim 1, characterized in that, The wind power generation unit includes a diversion box (9). Air inlets (10) and air outlets (11) are respectively provided on both side walls of the diversion box (9). A rotating shaft (13) is rotatably installed inside the diversion box (9) through a bearing (12), and wind turbine blades (14) are installed on the rotating shaft (13). One end of the rotating shaft (13) passes through the outer wall of the diversion box (9) and is connected to the power input shaft of a generator (15).

6. The tail gas recycling system for ore powder production according to claim 5, characterized in that, The end of the rotating shaft (13) is connected to the input end of a speed increaser (16), and the output end of the speed increaser (16) is connected to the power input shaft of the generator (15).

7. The tail gas recycling system for mineral powder production according to claim 1, wherein A tee joint is installed at the outlet of the power generation duct (2). One outlet of the tee joint is connected to the power generation discharge duct (3), and the other outlet is connected to a circulation duct (19). The outlet of the circulation duct (19) is connected to a mixed air chamber (20).

8. The tail gas recycling system for ore powder production according to claim 7, wherein A second safety relief valve (21) is installed at the front end of the power generation discharge duct (3), and a third safety relief valve (22) is installed at the front end of the circulation duct (19).

Images