Pulse type bag-type dust collector

Abstract

The utility model belongs to the field of improved filters specially used for separating dispersion particles from gas, and particularly relates to a pulse type bag-type dust collector. The utility model provides a pulse type bag-type dust collector in order to solve the technical problem that when a blowing air bag heating device of a pulse bag-type dust collector in the prior art is used, a steam pipeline needs to be additionally laid for a steam coil, and devices such as a boiler capable of generating high-temperature steam need to be arranged, so that the cost is high. The pulse type bag-type dust collector comprises a shell, a gas distribution bag, a filter bag and a purification chamber, the filter bag and the purification chamber are located in the shell, a heat exchange channel used for heating compressed gas in the gas distribution bag is arranged outside the gas distribution bag, and one end of the heat exchange channel communicates with the purification chamber through a gas inlet pipe so as to obtain high-temperature flue gas purified by the filter bag from the purification chamber. The other end is connected with an air outlet pipe. The waste heat of the high-temperature flue gas purified by the filter bag is used for heating the compressed gas in the gas separation bag, so that the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of improved filters specially used for separating dispersed particles from gas, in particular to a pulse bag dust collector. Background Art

[0002] The pulse bag dust collector is a commonly used dry dust filtering device, which mainly includes a housing, a filter bag located in the housing, an air jet pipe for blowing the filter bag to blow off the dust on the filter bag, a blowing air bag connected to the air jet pipe, a pulse valve for controlling the blowing air bag to spray into the air jet pipe, and a purification chamber for passing the gas purified by the filter bag, and an exhaust port is provided at one end of the purification chamber, through which the gas purified by the filter bag can be discharged from the purification chamber. For example, the Chinese utility model patent with the authorization announcement number CN207871760U and the authorization announcement date of September 18, 2018 discloses the pulse bag dust collector as described above.

[0003] As the country's environmental protection requirements continue to increase, pulse bag dust collectors that are suitable for capturing fine, dry, non-fibrous particles are widely used in coking plants, iron and steel plants, carbon black plants, thermal power stations and other enterprises.

[0004] In the above application, the gas to be removed by the pulse bag dust collector is high-temperature flue gas. When the ambient temperature is low, the pulse bag dust collector will blow the compressed air with lower temperature in the air bag to the filter bag. Due to the large temperature difference between the compressed gas and the high-temperature flue gas, condensation will occur on the surface of the filter bag, accelerating the aging of the filter bag and shortening the service life of the filter bag.

[0005] To solve the above problems, a Chinese utility model patent with authorization announcement number CN202638160U and authorization announcement date 2013.01.02 discloses a pulse bag dust collector injection air bag heating device, the heating device includes a steam coil (i.e., a heating tube) wrapped around the outside of the injection air bag (i.e., a sub-air bag, and the internal channel of the steam coil constitutes a heat exchange channel) and a rock wool insulation layer wrapped around the steam coil and the outside of the injection air bag.

[0006] When in use, the steam coil is connected to the steam pipeline, and the high-temperature water vapor in the steam coil exchanges heat with the compressed gas in the injection air bag, thereby achieving the technical effect of heating the compressed gas in the injection air bag, thereby reducing the temperature difference between the compressed gas and the high-temperature flue gas, avoiding condensation on the surface of the filter bag, and extending the service life of the filter bag.

[0007] However, in the above-mentioned pulse bag dust collector air bag heating device, the steam coil needs to be connected to an external steam pipeline, which requires the laying of additional steam pipelines and the installation of devices such as boilers that can generate high-temperature steam, which is costly. Utility Model Content

[0008] The purpose of the utility model is to provide a pulse bag dust collector to solve the technical problem that when using the pulse bag dust collector in the prior art to blow the air bag heating device, it is necessary to lay additional steam pipelines for the steam coil and to set up a boiler that can generate high-temperature water vapor, etc., which leads to high costs.

[0009] In order to achieve the above-mentioned purpose, the technical solution of the pulse bag dust collector provided by the utility model is:

[0010] A pulse bag dust collector comprises a shell, an air separation bag, a filter bag located in the shell and a purification chamber for high-temperature flue gas purified by the filter bag to pass through. A heat exchange channel for heating the compressed gas in the air separation bag is provided on the outside of the air separation bag. One end of the heat exchange channel is connected to the purification chamber through an air inlet pipe to obtain the high-temperature flue gas purified by the filter bag from the purification chamber, and the other end is connected to an air outlet pipe.

[0011] Furthermore, the downstream of the air outlet pipe is connected to the purification chamber, and in the flow direction of the high-temperature flue gas purified by the filter bag in the purification chamber that has not entered the air inlet pipe, the connection between the air inlet pipe and the purification chamber is located upstream of the connection between the air outlet pipe and the purification chamber.

[0012] Furthermore, the downstream of the air outlet pipe is connected to the purification chamber. In the flow direction of the high-temperature flue gas purified by the filter bag in the purification chamber but not entering the air inlet pipe, the connection between the air inlet pipe and the purification chamber is located downstream of the connection between the air outlet pipe and the purification chamber, and an air pump is provided on the air inlet pipe or the air outlet pipe to ensure that the high-temperature flue gas purified by the filter bag in the purification chamber can enter the heat exchange channel.

[0013] Furthermore, the air intake pipe is provided with an air intake valve whose opening can be adjusted to control the air intake amount.

[0014] Furthermore, an outlet valve is provided on the outlet pipe, the opening of which can be adjusted to control the amount of air intake.

[0015] Furthermore, the heat exchange channel is simultaneously located on at least two sides of the gas distribution bag.

[0016] Furthermore, a heating pipe is provided outside the gas distribution bag, and the internal channel of the heating pipe constitutes the heat exchange channel.

[0017] Furthermore, the heating tube is closely attached to the outer wall of the gas distribution bag.

[0018] Furthermore, a mounting platform is provided on the shell, and the air distribution bag is mounted on the mounting platform.

[0019] The beneficial effects of the pulse bag dust collector of the utility model are as follows: the utility model is an improved invention. The filter bag can be installed through the shell, and it can ensure that the gas to be purified enters the inside of the filter bag from the outside of the filter bag and then enters the purification chamber; the high-temperature flue gas can be purified through the filter bag, and the compressed gas for blowing off the dust on the filter bag can be provided through the air separation bag; the compressed gas in the air separation bag can be heated through the heat exchange channel, thereby avoiding condensation on the surface of the filter bag and extending the service life of the filter bag; through the air inlet pipe connected to the purification chamber, the high-temperature flue gas in the purification chamber purified by the filter bag can enter the heat exchange channel, so that the high-temperature flue gas purified by the filter bag is used to heat the compressed gas in the air separation bag, and there is no need to set up additional steam pipelines and boilers for generating high-temperature water vapor, etc., which is low in cost and saves the energy required to generate high-temperature water vapor; the gas in the heat exchange channel after heat exchange with the compressed gas in the air separation bag can be discharged through the air outlet pipe, so that the high-temperature flue gas purified by the filter bag can continuously enter the heat exchange channel to heat the compressed gas in the air separation bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the pulse bag dust collector of the utility model from one angle;

[0021] Figure 2 It is a schematic structural diagram of another angle of an embodiment of the pulse bag dust collector of the utility model.

[0022] Description of reference numerals:

[0023] 1. Air distribution bag; 2. Heating pipe; 3. Air inlet pipe; 31. Air inlet valve; 4. Air outlet pipe; 41. Air outlet valve; 5. Pipe joint; 6. Drain valve; 7. Pulse valve; 8. Inspection door; 9. Installation platform; 10. Bracket; 11. Jet pipe. DETAILED DESCRIPTION

[0024] In order to solve the problems raised in the background technology, the main inventive concept of the utility model is: to use the waste heat of the high-temperature flue gas purified by the filter bag to heat the compressed gas in the gas separation bag, thereby eliminating the need for additional steam pipelines and boilers for generating high-temperature water vapor, thereby reducing costs and saving the energy required to generate high-temperature water vapor.

[0025] The present invention is further described in detail below in conjunction with the embodiments.

[0026] The specific embodiment of the pulse bag dust collector provided by the utility model is as follows:

[0027] like Figure 1-2As shown, a pulse bag dust collector includes a shell, a filter bag located in the shell, an air jet pipe 11 for blowing the filter bag to blow off the dust on the filter bag, an air separator 1 connected to the air jet pipe 11 through a pipe joint 5, a pulse valve 7 for controlling the air separator 1 to spray into the air jet pipe 11, and a purification chamber for high-temperature flue gas purified by the filter bag to pass through. The air separator 1 is provided with a heat exchange channel for heating the compressed gas in the air separator 1 outside, one end of the heat exchange channel is connected to the purification chamber through an air inlet pipe 3, and the other end is connected to an air outlet pipe 4. The air separator 1 also has a drain valve 6 for discharging moisture in the compressed air in the air separator 1. The moisture in the air separator 1 can be discharged by opening the drain valve 6; an inspection door 8 is provided on the shell, and the filter bag located in the shell can be inspected by opening the inspection door 8.

[0028] like Figure 1-2 As shown, in order to conveniently set up the heat exchange channel, as a specific embodiment, a heating pipe 2 is provided outside the gas separation bag 1, and the internal channel of the heating pipe 2 constitutes the heat exchange channel. The heat exchange channel can be conveniently formed by the heating pipe 2. However, in other specific embodiments, the outer wall of the gas separation bag 1 can also have two layers, and the space between the two layers of the outer wall constitutes the heat exchange channel.

[0029] The filter bag can be installed through the shell, and it can ensure that the gas to be purified enters the inside of the filter bag from the outside of the filter bag and then enters the purification chamber; the filter bag can purify high-temperature flue gas, and the air separator 1 can provide compressed gas to blow off the dust on the filter bag; the compressed gas in the air separator 1 can be heated through the heat exchange channel, so as to avoid condensation on the surface of the filter bag and extend the service life of the filter bag; through the air inlet pipe 3 connected to the purification chamber, the high-temperature flue gas in the purification chamber that has been purified by the filter bag can enter the heat exchange channel, so that the high-temperature flue gas purified by the filter bag can be used to heat the compressed gas in the air separator 1, and there is no need to set up additional steam pipelines and boilers for generating high-temperature water vapor, which is low in cost and saves the energy required to generate high-temperature water vapor; the gas in the heat exchange channel that has been heat exchanged with the compressed gas in the air separator 1 can be discharged through the air outlet pipe 4, so that the high-temperature flue gas purified by the filter bag can continuously enter the heat exchange channel to heat the compressed gas in the air separator 1.

[0030] like Figure 1-2As shown, in order to avoid wasting the residual heat of the gas after heating the compressed gas in the gas separation bag 1, as a specific implementation method, the downstream of the outlet pipe 4 is connected to the purification chamber, and the high-temperature flue gas purified by the filter bag exchanges heat with the compressed gas in the gas separation bag 1 in the heat exchange channel, and then flows into the purification chamber from the outlet pipe 4 and is mixed with the high-temperature flue gas purified by the filter bag that has not entered the inlet pipe 3. After that, the mixed gas is discharged from the exhaust port of the purification chamber to facilitate the subsequent use of the residual heat of the mixed gas; when the high-temperature flue gas purified by the filter bag does not meet the environmental protection requirements, the mixed gas can also be conveniently subjected to post-treatment such as desulfurization.

[0031] Of course, in other specific embodiments, under the premise that the high-temperature flue gas purified by the filter bag meets environmental protection requirements, the outlet of the air outlet pipe 4 can also be directly connected to the atmosphere to discharge the gas after heat exchange with the compressed air in the gas separation bag 1 into the atmosphere.

[0032] like Figure 1-2 As shown, in order to simplify the structure and reduce the cost, as a specific implementation method, in the flow direction of the high-temperature flue gas purified by the filter bag in the purification chamber that has not entered the air inlet pipe 3, the connection between the air inlet pipe 3 and the purification chamber is located upstream of the connection between the air outlet pipe 4 and the purification chamber. Since the gas will spontaneously flow from a place with higher air pressure to a place with lower air pressure, the high-temperature flue gas purified by the filter bag in the purification chamber will spontaneously flow into the air inlet pipe 3 and spontaneously flow out from the air outlet pipe 4. There is no need to set up an additional power source to drive the high-temperature flue gas purified by the filter bag to enter the air inlet pipe 3, and the structure is simple and the cost is low.

[0033] Of course, in other specific embodiments, in the flow direction of the high-temperature flue gas purified by the filter bag in the purification chamber that has not entered the air inlet pipe 3, the connection between the air inlet pipe 3 and the purification chamber is located downstream of the connection between the air outlet pipe 4 and the purification chamber. At this time, an air pump that draws the high-temperature flue gas purified by the filter bag in the purification chamber into the air inlet pipe 3 can be set at the air inlet pipe 3, or an air pump that draws the gas in the heat exchange channel out can be set at the air outlet pipe 4, so that the air pressure in the heat exchange channel is lower, ensuring that the high-temperature flue gas purified by the filter bag in the purification chamber can continuously enter the heat exchange channel from the air inlet pipe 3.

[0034] like Figure 1-2As shown, in order to conveniently control the temperature of the compressed air in the air separator 1 according to the ambient temperature, as a specific embodiment, an air intake valve 31 whose opening can be adjusted to control the air intake amount is provided on the air intake pipe 3. By controlling the opening of the air intake valve 31, the air intake amount of the high-temperature flue gas purified by the filter bag entering the heat exchange channel can be adjusted. When the ambient temperature is low, the opening of the air intake valve 31 is increased to ensure that the temperature of the compressed air in the air separator 1 meets the requirements; when the ambient temperature is high, since the temperature of the compressed air in the air separator 1 is relatively high, the opening of the air intake valve 31 is reduced to ensure that the temperature of the compressed air in the air separator 1 is within a reasonable range.

[0035] Of course, in other specific embodiments, the air inlet valve 31 may not be provided on the air inlet pipe 3, but an air outlet valve 41 whose opening can be adjusted to control the air intake amount may be provided on the air outlet pipe 4. The air intake amount is controlled by controlling the opening of the air outlet valve 41, thereby conveniently controlling the temperature of the compressed air in the air distribution bag 1 according to the ambient temperature.

[0036] like Figure 1-2 As shown, as a specific implementation, the pulse bag dust collector is provided with an air inlet valve 31 and an air outlet valve 41 at the same time; of course, in other specific implementations, the air inlet valve 31 may be provided alone, or the air outlet valve 41 may be provided alone; or, the air inlet valve 31 and the air outlet valve 41 are not provided, and an air pump is provided on the air inlet pipe 3 to draw the high-temperature flue gas purified by the filter bag in the purification chamber into the air inlet pipe 3, and the air intake amount entering the heat exchange channel is adjusted by controlling the power of the air pump.

[0037] like Figure 1-2 As shown, in order to improve the heat exchange efficiency, as a specific implementation method, the heat exchange channel is simultaneously located at three sides of the gas separator 1, thereby increasing the heat exchange area between the heat exchange channel and the gas separator 1 and improving the heat exchange efficiency. Specifically, at one side of the gas separator 1, the heating tube 2 is in a "U" shape to increase the heat exchange area between the heating tube 2 and the gas separator 1 and improve the heating efficiency. Of course, in other specific implementation methods, at one side of the gas separator 1, the heating tube 2 can also be in an "S" shape or a "V" shape. However, in other specific implementation methods, the heating tube 2 can also be located only at one side of the gas separator 1, or at two sides of the gas separator 1, or at four sides of the gas separator 1, or at the bottom of the gas separator 1. In this embodiment, there is no restriction on the setting position and specific structure of the heating tube 2, as long as the heating tube 2 can exchange heat with the compressed gas in the gas separator 1.

[0038] like Figure 1-2As shown, in order to further improve the heat exchange efficiency, as a specific implementation, the heating tube 2 is closely attached to the outer wall of the air dividing bag 1, and the heat exchange efficiency is improved by shortening the distance between the heating tube 2 and the air dividing bag 1. Of course, in other specific implementations, the heating tube 2 can also maintain a certain distance from the outer wall of the air dividing bag 1, and the air dividing bag 1 and the heating tube 2 can also be wrapped together with insulation materials, so as to ensure that the temperature of the air between the air dividing bag 1 and the heating tube 2 is high, thereby further improving the heat exchange efficiency.

[0039] like Figure 1-2 As shown, in order to facilitate the installation of the air distribution bag 1, as a specific embodiment, a mounting platform 9 is provided on the shell, and the air distribution bag 1 is installed on the mounting platform 9. Specifically, a bracket 10 is installed on the mounting platform 9, and the air distribution bag 1 is installed on the bracket 10, and the bracket 10 does not interfere with the heating pipe 2. The air distribution bag 1 can be conveniently installed through the mounting platform 9. Of course, in other specific embodiments, the bracket 10 can also be installed on the ground, and the air distribution bag 1 can be installed on the bracket 10.

[0040] Finally, it should be noted that the above are only preferred embodiments of the utility model and are not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A pulse bag dust collector, comprising a housing, a gas separation bag, a filter bag located in the housing, and a purification chamber for high-temperature flue gas purified by the filter bag to pass through, and a heat exchange channel for heating the compressed gas in the gas separation bag is provided outside the gas separation bag, characterized in that: One end of the heat exchange channel is connected to the purification chamber through an air inlet pipe to obtain high-temperature flue gas purified by the filter bag from the purification chamber, and the other end is connected to an air outlet pipe.

2. The pulse bag dust collector according to claim 1, characterized in that: The downstream of the air outlet pipe is connected to the purification chamber. In the flow direction of the high-temperature flue gas purified by the filter bag in the purification chamber that has not entered the air inlet pipe, the connection between the air inlet pipe and the purification chamber is located upstream of the connection between the air outlet pipe and the purification chamber.

3. The pulse bag dust collector according to claim 1, characterized in that: The downstream of the air outlet pipe is connected to the purification chamber. In the flow direction of the high-temperature flue gas purified by the filter bag in the purification chamber that has not entered the air inlet pipe, the connection between the air inlet pipe and the purification chamber is located downstream of the connection between the air outlet pipe and the purification chamber, and an air pump is provided on the air inlet pipe or the air outlet pipe to ensure that the high-temperature flue gas purified by the filter bag in the purification chamber can enter the heat exchange channel.

4. The pulse bag dust collector according to any one of claims 1 to 3, characterized in that: The intake pipe is provided with an intake valve whose opening can be adjusted to control the intake amount.

5. The pulse bag dust collector according to any one of claims 1 to 3, characterized in that: The air outlet pipe is provided with an air outlet valve whose opening can be adjusted to control the air intake amount.

6. The pulse bag dust collector according to any one of claims 1 to 3, characterized in that: The heat exchange channel is simultaneously located on at least two sides of the gas distribution bag.

7. The pulse bag dust collector according to any one of claims 1 to 3, characterized in that: A heating pipe is arranged outside the gas distribution bag, and the internal channel of the heating pipe constitutes the heat exchange channel.

8. The pulse bag dust collector according to claim 7, characterized in that: The heating tube is closely attached to the outer wall of the gas distribution bag.

9. The pulse bag dust collector according to any one of claims 1 to 3, characterized in that: A mounting platform is arranged on the shell, and the air distribution bag is mounted on the mounting platform.

Images