Device for reducing coal dilution

Abstract

The device comprises an air inlet pipe, a cyclone dust removal bin, a dust collection chamber and a filtering bin, the cyclone dust removal bin is installed on the ground through a supporting frame, the upper portion of the cyclone dust removal bin is cylindrical, and the lower portion of the cyclone dust removal bin is conical; one end of the air inlet pipe is connected with the tail of the cement kiln through the induced draft fan, and the other end of the air inlet pipe is communicated with the upper part of the cyclone dust removal bin along the tangential direction; the dust collection chamber is communicated with the lower part of the cyclone dust removal bin; an air outlet pipe is arranged at the upper part of the cyclone dust removal bin, the lower part of the filter bin is connected with the air outlet pipe, and the upper part of the filter bin is connected with pulverized coal vertical mill equipment through a communicating pipe.

Description

Technical Field

[0001] The present application relates to the technical field of cement production equipment, and in particular to a device for reducing coal impoverishment. Background Art

[0002] Cement is a powdered, hydraulic, inorganic gelling material. After adding water and stirring, it forms a slurry that can harden in air or water. It is a crucial material in current infrastructure construction. Dry-process cement production utilizes a novel dry-process calcination technology, new raw materials, fuel pre-homogenization techniques, and energy-saving grinding technology and equipment. Computerized distributed control is employed throughout the production line to achieve automated, efficient, high-quality, low-consumption, and environmentally friendly cement production. In the dry cement process, pulverized coal is required as raw material. The pulverized coal is mainly produced by vertical mill equipment. Since the vertical mill equipment needs to introduce hot air, the hot air drawn out from the kiln tail also has a large amount of smoke and dust. For this reason, people have designed a device for reducing coal depletion, such as the one disclosed in Chinese patent application number 201720379200.1, which includes a base, a sedimentation bin mounting seat is provided at the upper end of the base, a dust outlet is provided on the front surface of the sedimentation bin mounting seat, a dust outlet is provided inside the dust outlet, a dust exhaust pipe is provided inside the dust exhaust pipe, a dust valve is provided at the upper end of the dust exhaust pipe, a dust valve handwheel is provided on the front surface of the sedimentation bin mounting seat near the dust outlet valve, and a sedimentation bin is provided above the sedimentation bin mounting seat. The device filters the smoke and dust in the hot air at the tail of the kiln through a filter, and drives the dust removal brush to clean the filter through a motor. However, in actual use, the smoke and dust content in the hot air is relatively high and is easily clogged. Secondly, the hot air can easily overheat the motor through heat transfer, while reducing the service life of the dust removal brush and the reliability of the equipment. Therefore, a device for reducing coal depletion is needed. After partially reducing the dust in the hot air through cyclone dust removal, it is filtered twice through a filter to reduce the dust accumulation rate of the filter, and clean hot air is taken from the kiln head to back-blow the filter to prevent the filter from being clogged. Utility Model Content

[0003] In order to solve the above problems, the present application proposes a device for reducing coal depletion. After pre-reducing part of the dust in the hot air by means of cyclone dust removal, it is filtered twice through the filter to reduce the dust accumulation rate of the filter, and clean hot air is taken from the kiln head to back-blow the filter to prevent the filter from being blocked.

[0004] This application is achieved through the following technical solutions:

[0005] The present application proposes a device for reducing coal depletion, comprising: an air inlet pipe, a cyclone dust collector, a dust collecting chamber, and a filter chamber. The cyclone dust collector is installed on the ground through a support frame, the upper part of the cyclone dust collector is cylindrical, and the lower part of the cyclone dust collector is conical; one end of the air inlet pipe is connected to the tail of the cement kiln through an induced draft fan, and the other end of the air inlet pipe is connected to the upper part of the cyclone dust collector along a tangential direction; the dust collecting chamber is connected to the lower part of the cyclone dust collector; the upper part of the cyclone dust collector is provided with an air outlet pipe, the lower part of the filter chamber is connected to the air outlet pipe, and the upper part of the filter chamber is connected to the coal powder vertical mill equipment through a connecting pipe.

[0006] Furthermore, the air outlet pipe extends from top to bottom along the central axis into the cyclone dust removal bin, and the lower end of the air outlet pipe is 50 cm to 100 cm lower than the air inlet pipe.

[0007] Furthermore, a baffle is provided on the inner wall of the cyclone dust collector, one end of the baffle is fixedly connected to the inner wall of the cyclone dust collector, the other end of the baffle is suspended in the air, and the baffle points radially toward the center of the cyclone dust collector, and the baffle has an angle of 15° to 30° with the horizontal plane.

[0008] Furthermore, a filter screen is provided in the filter bin, and the filter screen is parallel to the horizontal plane.

[0009] Furthermore, the middle portion of the connecting pipe is connected to the head of the cement kiln through a back-blowing pipe and an induced draft fan, and both the back-blowing pipe and the connecting pipe are provided with air valves.

[0010] Furthermore, a discharge valve is provided at the lower portion of the dust collecting chamber.

[0011] The beneficial effects of this application are: a cyclone dust removal chamber is used to separate the dust in the high-temperature flue gas for the first time, and then a filter is used for secondary filtration, so as to achieve efficient filtration of the high-temperature flue gas and reduce the impact of dust on the depletion of coal powder. The cyclone dust removal chamber is not easily clogged by dust, which can reduce the speed of dust accumulation on the filter. Clean hot air can be introduced through the back-blowing pipe to back-blow the filter, so as to avoid clogging of the filter and improve the filtration efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] In the figure: 1-inlet pipe, 2-cyclone dust collector, 3-dust collecting chamber, 4-filter chamber, 5-support frame, 6-outlet pipe, 7-connecting pipe, 8-baffle, 9-filter screen, 10-backflush pipe, 11-air valve, 12-discharge valve. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. 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 making creative work are within the scope of protection of the present invention.

[0015] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0016] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the said features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0017] like Figure 1 As shown, an embodiment of the present invention provides a device for reducing coal depletion, comprising: an air inlet pipe 1, a cyclone dust collector 2, a dust collecting chamber 3, and a filter chamber 4. The cyclone dust collector 2 is installed on the ground through a support frame 5. The upper part of the cyclone dust collector 2 is cylindrical, and the lower part of the cyclone dust collector 2 is conical; one end of the air inlet pipe 1 is connected to the tail of the cement kiln through an induced draft fan, and the other end of the air inlet pipe 1 is connected to the upper part of the cyclone dust collector 2 along a tangential direction; the dust collecting chamber 3 is connected to the lower part of the cyclone dust collector 2; the upper part of the cyclone dust collector 2 is provided with an air outlet pipe 6, the lower part of the filter chamber 4 is connected to the air outlet pipe 6, and the upper part of the filter chamber 4 is connected to the coal powder vertical mill equipment through a connecting pipe 7.

[0018] The cyclone dust collector 2 adopts the principle of the existing cyclone dust collector. The high-temperature flue gas containing dust is sucked from the tail of the cement kiln through the induced draft fan and sent into the air inlet pipe 1. After entering the cyclone dust collector 2 through the air inlet pipe 1, the flue gas rotates along the cyclone dust collector 2 and gradually moves downward under the action of inertia. Due to the high density of the dust in the flue gas, it is thrown to the inner wall of the cyclone dust collector 2 during rotation, thereby reducing the speed of the dust, and finally falls into the dust collecting chamber 3 under the action of gravity, and the treated air enters the filter bin 4 from the bottom to the top through the air outlet pipe 6. The cyclone dust collection method does not require consumables and is not easy to clog the inside of the cyclone dust collector 2. There is no mechanical moving equipment inside the cyclone dust collector 2, and it has a long service life at high temperature. However, the cyclone dust collection method cannot completely filter the dust. Therefore, a filter screen 9 is set in the filter bin 4 to perform secondary filtration on the high-temperature flue gas, thereby achieving efficient filtration of the high-temperature flue gas and reducing the impact of dust on coal powder depletion.

[0019] The high-temperature flue gas flowing through filter 9 has already undergone a first filtration in cyclone dust collection chamber 2, significantly reducing the dust content. This can reduce the rate at which dust accumulates on filter 9, ensuring the filtration efficiency of filter 9. Since the high-temperature flue gas flows through filter 9 from bottom to top, dust will accumulate at the bottom of filter 9. When the accumulation reaches a certain level, it will increase the resistance of filter 9. Therefore, regular backflushing is required. During backflushing, clean air from the head of the cement kiln is sent into backflushing pipe 10 by an induced draft fan. After passing through backflushing pipe 10 and connecting pipe 7, it is blown into filter chamber 4, causing the air flow to flow from top to bottom through filter 9, causing the dust accumulated on filter 9 to be blown off into dust collection chamber 3. The backflushed air then flows through air inlet pipe 1 to the rear of the cement kiln. Together with the flue gas from the rear of the cement kiln, it is processed in the scrubber tower and discharged into the atmosphere. After backflushing, the dust on filter 9 is removed, restoring the filtration capacity and extending the service life of filter 9.

[0020] The filtered high-temperature flue gas is sent to the coal powder vertical mill equipment to assist in the grinding of coal powder. The ground coal powder is used as raw material for the production of dry cement.

[0021] Preferably, the air outlet pipe 6 extends from top to bottom along the central axis into the cyclone dust collector 2, and the lower end of the air outlet pipe 6 is 50 cm to 100 cm lower than the air inlet pipe 1, so that after the flue gas enters the cyclone dust collector 2, it cannot be discharged directly through the air outlet pipe 6, but is subjected to rotary centrifugal dust removal and then discharged through the air outlet pipe 6, thereby realizing dust removal treatment of high-temperature flue gas.

[0022] Specifically, a baffle 8 is provided on the inner wall of the cyclone dust collector 2, one end of the baffle 8 is fixedly connected to the inner wall of the cyclone dust collector 2, and the other end of the baffle 8 is suspended in the air, and the baffle 8 radially points to the center of the cyclone dust collector 2, and the baffle 8 has an angle of 15° to 30° with the horizontal plane. When the high-temperature flue gas flows along the inner wall of the cyclone dust collector 2, when it flows through the baffle 8, it can be deflected downward under the action of the baffle 8, so that the dust can gradually move to the lower part of the cyclone dust collector 2 when it rotates along the inner wall of the cyclone dust collector 2, and fall into the dust collecting chamber 3.

[0023] In a specific embodiment, a filter screen 9 is provided in the filter bin 4, and the filter screen 9 is parallel to the horizontal plane. The cyclone dust removal bin 2 can only filter 80%-90% of the dust, and some dust will still flow into the air outlet pipe 6 along with the air flow. Therefore, a filter screen 9 is provided in the filter bin 4 to further filter the dust in the flue gas and reduce the impact of dust on the depletion of coal powder.

[0024] In a preferred embodiment, the middle part of the connecting pipe 7 is connected to the head of the cement kiln through a backblowing pipe 10 and an induced draft fan, and an air valve 11 is provided on the backblowing pipe 10 and the connecting pipe 7. Since the high-temperature flue gas flows through the filter 9 from bottom to top, dust will gather at the bottom of the filter 9. After gathering to a certain extent, the resistance of the filter 9 will increase. Therefore, backblowing is required regularly. During backblowing, the clean air at the head of the cement kiln is sent into the backblowing pipe 10 by the induced draft fan, and after passing through the backblowing pipe 10 and the connecting pipe 7, it is blown into the filter bin 4, so that the airflow flows through the filter 9 from top to bottom, so that the dust gathered on the filter 9 is blown into the dust collecting chamber 3. The airflow after backblowing flows to the tail of the cement kiln through the air inlet pipe 1, and is discharged into the atmosphere after being treated in the scrubbing tower together with the flue gas at the tail of the cement kiln. After back-blowing, the dust on the filter screen 9 falls off, the filtering capacity is restored, and the service life of the filter screen 9 is increased. The air valve 11 can adjust the flow direction of the gas so that the clean air back-blows the filter screen 9.

[0025] Specifically, a discharge valve 12 is provided at the lower portion of the dust collecting chamber 3 . After the discharge valve 12 is opened, the dust in the dust collecting chamber 3 can be discharged to avoid blockage in the dust collecting chamber 3 .

[0026] Of course, the present application may have many other implementations. Based on the present implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present application.

Claims

1. A device for reducing coal depletion, characterized in that: include: An air inlet pipe (1), a cyclone dust collecting bin (2), a dust collecting chamber (3), and a filter bin (4); the cyclone dust collecting bin (2) is installed on the ground through a support frame (5); the upper part of the cyclone dust collecting bin (2) is cylindrical, and the lower part of the cyclone dust collecting bin (2) is conical; one end of the air inlet pipe (1) is connected to the tail of the cement kiln through an induced draft fan, and the other end of the air inlet pipe (1) is connected to the upper part of the cyclone dust collecting bin (2) along a tangential direction; the dust collecting chamber (3) is connected to the lower part of the cyclone dust collecting bin (2); an air outlet pipe (6) is provided on the upper part of the cyclone dust collecting bin (2), the lower part of the filter bin (4) is connected to the air outlet pipe (6), and the upper part of the filter bin (4) is connected to the coal powder vertical mill equipment through a connecting pipe (7).

2. The device for reducing coal depletion according to claim 1, characterized in that: The air outlet pipe (6) extends from top to bottom along the central axis into the cyclone dust removal bin (2), and the lower end of the air outlet pipe (6) is 50 cm to 100 cm lower than the air inlet pipe (1).

3. The device for reducing coal depletion according to claim 1, characterized in that: A baffle (8) is provided on the inner wall of the cyclone dust removal bin (2), one end of the baffle (8) is fixedly connected to the inner wall of the cyclone dust removal bin (2), the other end of the baffle (8) is suspended, and the baffle (8) points radially toward the center of the cyclone dust removal bin (2), and the baffle (8) has an angle of 15° to 30° with the horizontal plane.

4. The device for reducing coal depletion according to claim 1, characterized in that: A filter screen (9) is provided in the filter bin (4), and the filter screen (9) is parallel to the horizontal plane.

5. The device for reducing coal depletion according to claim 1, characterized in that: The middle part of the connecting pipe (7) is connected to the head of the cement kiln through a back-blowing pipe (10) and an induced draft fan, and both the back-blowing pipe (10) and the connecting pipe (7) are provided with air valves (11).

6. The device for reducing coal depletion according to claim 1, characterized in that: A discharge valve (12) is provided at the lower portion of the dust collecting chamber (3).

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