A papermaking exhaust gas treatment system

Abstract

The application provides a papermaking waste gas treatment system, which comprises a front gas-water-slag separator, a secondary gas-water-slag separator, a cooler, a fan and a water tank; wherein the gas inlet of the front gas-water-slag separator is connected with a waste gas pipeline of a papermaking machine, the gas outlet of the front gas-water-slag separator is connected with the gas inlet of the secondary gas-water-slag separator, and the water outlet of the front gas-water-slag separator is connected with the water tank; the gas outlet of the secondary gas-water-slag separator is connected with the fan, and the water outlet of the secondary gas-water-slag separator is connected with the water tank; the gas inlet of the cooler is communicated with the top end of the inside of the secondary gas-water-slag separator through a first pipeline, and the gas outlet of the cooler is communicated with the bottom end of the inside of the secondary gas-water-slag separator through a second pipeline. The papermaking waste gas treatment system is provided with two slag-removing filters, and the cooler is used for cooling the gas in the secondary separator, so that the separation effect is improved, and the service life of the fan is prolonged.

Description

Technical Field

[0001] This invention relates to the field of papermaking equipment technology, and in particular to a papermaking waste gas treatment system. Background Technology

[0002] The papermaking process involves dewatering, pressing, and drying pulp to form paper. During this process, the pulp contains glue, which generates steam containing glue residue. Traditional papermaking systems are equipped with a descaling device. Specifically, a blower creates negative pressure within the descaling device to draw the glue-laden steam in for removal before it is discharged from the blower's outlet. However, due to the high temperatures of the papermaking process, simply using a descaling device doesn't prevent the exhaust gas from reaching temperatures exceeding 50 degrees Celsius. Since the blower itself operates at high temperatures for extended periods, the combined effect of this high-temperature gas can push the internal temperature of the blower above 100 degrees Celsius, leading to frequent blower malfunctions such as bearing damage and motor burnout, severely impacting production. Furthermore, a single pre-descaling device may not completely separate the glue residue, allowing it and water to remain in the blower, causing frequent impeller failures and further disrupting production.

[0003] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0004] This invention provides a papermaking waste gas treatment system, which aims to solve the technical problems of existing papermaking waste gas treatment systems lacking effective cooling of waste gas and incomplete removal of glue residue.

[0005] This invention provides a papermaking waste gas treatment system, including a pre-gas-water-sludge separator, a secondary gas-water-sludge separator, a cooler, a fan, and a water tank. The air inlet of the pre-gas-water-sludge separator is connected to the waste gas pipeline of the papermaking machine, the air outlet of the pre-gas-water-sludge separator is connected to the air inlet of the secondary gas-water-sludge separator, and the water outlet of the pre-gas-water-sludge separator is connected to the water tank. The air outlet of the secondary gas-water-sludge separator is connected to the fan, and the water outlet of the secondary gas-water-sludge separator is connected to the water tank. The air inlet of the cooler is connected to the top of the interior of the secondary gas-water-sludge separator through a first pipe, and the air outlet of the cooler is connected to the bottom of the interior of the secondary gas-water-sludge separator through a second pipe.

[0006] In an optional embodiment of the present invention, both the pre-gas-water-sludge separator and the secondary gas-water-sludge separator include a hollow tank. The bottom of the tank is provided with a water outlet, the top of the tank is provided with a gas outlet, the inside of the tank is provided with a screen, the side wall of the tank above the screen is provided with a rinsing port, and the side wall of the tank below the screen is provided with a gas inlet.

[0007] In one optional embodiment of the present invention, a plurality of support blocks are provided on the inner wall of the tank, and the screen is disposed on the support blocks.

[0008] In one optional embodiment of the present invention, a slag baffle is provided on the inner wall of the air inlet position inside the tank.

[0009] In one optional embodiment of the present invention, the bottom of the slag-blocking cover is provided with an opening, and the slag-blocking cover is provided with a plurality of through holes.

[0010] In one optional embodiment of the present invention, a pressure gauge and a safety valve are provided on the top of the tank of the secondary gas-water-slag separator via an extension pipe.

[0011] In one optional embodiment of the present invention, a thermometer is provided at the air inlet of the fan.

[0012] In an optional embodiment of the present invention, the papermaking waste gas treatment system further includes a control box, in which a PLC controller is installed, and the PLC controller is electrically connected to the barometer, the thermometer, the fan and the safety valve.

[0013] In one optional embodiment of the present invention, the top of the cooler is provided with a slag removal port, and the slag removal port is provided with a removable cover plate.

[0014] In one optional embodiment of the present invention, the outlet of the pre-gas-water-sludge separator is connected to the water tank through a third pipe, and the outlet of the secondary gas-water-sludge separator is connected to the third pipe through a fourth pipe.

[0015] The beneficial effects are as follows: This invention provides a papermaking waste gas treatment system, including a pre-filter, a secondary filter, a cooler, a fan, and a water tank. The inlet of the pre-filter is connected to the waste gas pipeline of the papermaking machine, the outlet is connected to the inlet of the secondary filter, and the outlet is connected to the water tank. The outlet of the secondary filter is connected to the fan, and the outlet is connected to the water tank. The inlet of the cooler is connected to the top of the secondary filter via a first pipe, and the outlet is connected to the bottom of the secondary filter via a second pipe. This papermaking waste gas treatment system features two stages of slag removal filtration and utilizes a cooler to cool the gas in the second separator, improving the separation effect and extending the service life of the fan. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a papermaking waste gas treatment system according to the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of a pre-gas-water-slag separator according to the present invention.

[0018] The icon numbers in the figure are as follows:

[0019] 10-Pre-gas-water-slag separator; 20-Secondary gas-water-slag separator; 30-Cooler; 40-Fan; 50-Water tank; 250-Exhaust gas pipeline; 230-First pipeline; 240-Second pipeline; 60-Tank body; 70-Water outlet; 80-Air outlet; 90-Screen; 100-Flushing port; 110-Air inlet; 120-Support block; 130-Slag baffle; 140-Open opening; 160-Barometer; 170-Safety valve; 180-Thermometer; 190-Control box; 200-Slag removal port; 210-Third pipeline; 220-Fourth pipeline. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] See Figure 1This invention provides a papermaking waste gas treatment system, including a pre-gas-water-sludge separator 10, a secondary gas-water-sludge separator 20, a cooler 30, a fan 40, and a water tank 50; the air inlet of the pre-gas-water-sludge separator 10 is connected to the waste gas pipeline 250 of the papermaking machine, the air outlet of the pre-gas-water-sludge separator 10 is connected to the air inlet of the secondary gas-water-sludge separator 20, and the water outlet of the pre-gas-water-sludge separator 10 is connected to the water tank 50; the air outlet of the secondary gas-water-sludge separator 20 is connected to the fan 40, and the water outlet of the secondary gas-water-sludge separator 20 is connected to the water tank 50; the air inlet of the cooler 30 is connected to the top of the interior of the secondary gas-water-sludge separator 20 through a first pipe 230, and the air outlet of the cooler 30 is connected to the bottom of the interior of the secondary gas-water-sludge separator 20 through a second pipe 240. In this invention, the blower 40 is used to extract air from the interior of the secondary gas-water-sludge separator 20, thereby creating a negative pressure inside the secondary gas-water-sludge separator 20. This negative pressure then creates a negative pressure inside the pre-gas-water-sludge separator 10, drawing waste gas from the waste gas pipe 250 of the paper machine. The cooler 30 is used to exchange heat with the interior of the secondary gas-water-sludge separator 20 to further reduce the temperature of the gas in the secondary gas-water-sludge separator 20. To better cool the gas, this invention utilizes a two-stage gas-water-sludge separator 20 to increase the gas flow path, and works in conjunction with the cooler 30 to reduce the final temperature of the gas entering the blower 40 to a lower level. Furthermore, the two-stage gas-water-sludge separator 20 can more effectively remove the glue residue from the waste gas, prevent the blower 40 from clogging, and extend the service life of the system.

[0022] In an optional embodiment of the present invention, the blower 40 and the pre-filter gas-water-sludge separator 10 are also connected by a pipeline, and a control valve is provided on the connecting pipeline between the blower 40 and the pre-filter gas-water-sludge separator 10. In this way, the exhaust gas treatment system of the present invention can realize two working modes, namely, using only the first-stage filtration and using the second-stage filtration. Specifically, the second-stage filtration is used when the paper machine is in normal continuous production, and the first-stage filtration is used when the paper machine malfunctions or is shut down for routine maintenance to reduce the power consumption of the system.

[0023] See Figure 2In an optional embodiment of the present invention, both the pre-gas-water-sludge separator 10 and the secondary gas-water-sludge separator 20 include a hollow tank 60. The bottom of the tank 60 is provided with a water outlet 70, the top of the tank 60 is provided with a gas outlet 80, the inside of the tank 60 is provided with a screen 90, the side wall of the tank 60 above the screen 90 is provided with a rinsing port 100, and the side wall of the tank 60 below the screen 90 is provided with a gas inlet 110. In this embodiment, the tank 60 is a pressure-resistant tank. The filtration principle of the pre-gas-water-sludge separator 10 and the secondary gas-water-sludge separator 20 is as follows: the waste gas containing glue residue enters the tank 60 through the air inlet 110 provided on the side wall of the tank 60. Since the waste gas itself is warm, it will automatically float upwards when it enters the tank. Then, the glue residue in the waste gas will be intercepted and adhered by the screen 90. After being filtered once, the waste gas enters the next tank 60 through the air outlet 80 provided on the top of the tank 60.

[0024] In an optional embodiment of the present invention, the volume of the tank 60 of the pre-gas-water-sludge separator 10 is configured to be much larger than the volume of the tank 60 of the secondary gas-water-sludge separator 20. For example, the volume of the tank 60 of the pre-gas-water-sludge separator 10 is 2-4 times the volume of the tank 60 of the secondary gas-water-sludge separator 20. The purpose of this is to use the tank 60 of the pre-gas-water-sludge separator 10 as a transfer chamber for waste gas. Since the volume of the tank 60 of the secondary gas-water-sludge separator 20 is small, it is also convenient to form a stronger negative pressure in the tank 60 of the secondary gas-water-sludge separator 20 to drive the waste gas to flow in the pipeline.

[0025] See Figure 2 In one optional embodiment of the present invention, a plurality of support blocks 120 are provided on the inner wall of the tank 60, and the screen 90 is disposed on the support blocks 120. In the present invention, a plurality of support blocks 120 are arranged in a ring on the inner wall of the tank 60 to form support for the screen 90 within the tank 60. The screen 90 is preferably a metal screen so that it can be reused after cleaning. In order to facilitate cleaning of the screen 90, a rinsing port 100 is provided on the side wall of the tank 60 above the screen 90. Multiple rinsing ports 100 can also be distributed on the outer arm of the tank 60 to facilitate rinsing of the screen 90 from various angles. In another optional embodiment of the present invention, a rinsing port 100 is also provided on the side wall of the tank 60 above the screen 90, so that the bottom surface of the screen 90 can also be rinsed.

[0026] See Figure 2 In an optional embodiment of the present invention, a slag baffle 130 is provided on the inner wall of the air inlet of the tank 60. In this invention, since the waste gas flowing from the waste gas pipe of the paper machine has a very high glue content, to prevent large glue particles from clogging the screen 90 later, a slag baffle 130 can be first installed on the inner wall of the air inlet of the tank 60 to filter out large glue particles, thus preventing the screen 90 from clogging and causing excessive pressure in the tank 60, which could lead to a safety accident.

[0027] See Figure 2 In an optional embodiment of the present invention, the bottom of the slag-blocking cover 130 is provided with an opening 140, and the slag-blocking cover 130 is provided with a plurality of through holes. In the present invention, the exhaust gas from the waste gas pipeline of the paper machine flows in from the air inlet of the tank 60 and then flows downward through the interception of the opening 140. In this way, the adhesive particles adhering to the slag-blocking cover 130 can be dislodged by the impact of the exhaust gas, avoiding blockage of the air inlet and affecting the efficiency of air intake. The shape of the slag-blocking cover 130 is preferably arc-shaped. The through holes on the slag-blocking cover 130 are provided to facilitate the adhesion of adhesive particles in the exhaust gas and to facilitate cleaning after blockage occurs.

[0028] See Figure 1 In an optional embodiment of the present invention, a pressure gauge 160 and a safety valve 170 are installed at the top of the tank 60 of the secondary gas-water-sludge separator 20 via an extension pipe. In this invention, to facilitate monitoring of the tank 60 of the secondary gas-water-sludge separator 20 and adjusting the exhaust gas intake speed, a pressure gauge 160 is installed at the top of the tank 60 of the secondary gas-water-sludge separator 20 via an extension pipe. Simultaneously, to ensure rapid pressure relief after tank blockage, a safety valve 170 is installed at the top of the tank 60 of the secondary gas-water-sludge separator 20 via an extension pipe.

[0029] See Figure 1 In an optional embodiment of the present invention, a thermometer 180 is provided at the air inlet of the fan 40. In this invention, in order to control the temperature entering the fan 40, a thermometer 180 is provided at the air inlet of the fan 40. When the temperature data obtained by the thermometer 180 exceeds a certain value, the fan will be triggered to stop working or reduce its power to extend the service life of the fan 40.

[0030] See Figure 1In an optional embodiment of the present invention, the papermaking waste gas treatment system further includes a control box 190, which houses a PLC controller. The PLC controller is electrically connected to the thermometer 180, the barometer 160, the fan 40, and the safety valve 170. In this invention, the PLC controller, thermometer 180, fan 40, and safety valve 170 constitute an automatic control system. By setting temperature protection parameters, the waste gas treatment system of the present invention ensures that the gas temperature entering the fan is within the normal operating temperature range of the fan; by setting pressure protection parameters, the fan operates within a reasonable pressure range; by using various sensors to monitor the papermaking waste gas treatment system in real time, and by using the feedback from the above systems to monitor and adjust the entire set of equipment, the papermaking waste gas treatment system can be made more automated.

[0031] See Figure 1 In an optional embodiment of the present invention, a slag removal port 200 is provided on the top of the cooler 30, and a removable cover plate is provided on the slag removal port 200. In the present invention, since gas exchange is required between the cooler 30 and the secondary gas-water-slag separator 20, blockage may occur in the cooler 30 under long-term operation. Therefore, a slag removal port 200 is also required on the cooler 30 to facilitate subsequent manual slag removal.

[0032] See Figure 1 In an optional embodiment of the present invention, the outlet of the pre-gas-water-sludge separator 10 is connected to the water tank 50 through a third pipe 210, and the outlet of the secondary gas-water-sludge separator 20 is connected to the third pipe 210 through a fourth pipe 220.

[0033] In summary, this invention provides a papermaking waste gas treatment system. In this system, paper machine glue residue is drawn into the existing slag-water separator by the negative pressure generated by the fan of the existing slag removal device. A small amount of residue and high-temperature water vapor after passing through the separator enter the cooling system of this invention. The cooling system further cools the slag-water mixture, with the cooling effect achieved by adjusting the cooling water temperature via a temperature control valve. After further cooling, the slag-water mixture enters the secondary slag-water separation system, where the glue residue is separated again. The separated, glue-removing gas enters the fan system. Throughout the process, the temperature control system monitors the fluid temperature and adjusts the cooling water flow accordingly upon system commands, ensuring that the final temperature entering the fan is within a reasonable range. The pressure stabilization system monitors the fan inlet pressure in real time throughout the process, effectively preventing excessively high inlet pressure from causing the fan motor to operate under high load and burn out.

[0034] Although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A papermaking waste gas treatment system, characterized in that, The system includes a pre-gas-water-sludge separator, a secondary gas-water-sludge separator, a cooler, a fan, and a water tank. The inlet of the pre-gas-water-sludge separator is connected to the waste gas pipeline of the paper machine, and the outlet of the pre-gas-water-sludge separator is connected to the inlet of the secondary gas-water-sludge separator. The outlet of the pre-gas-water-sludge separator is connected to the water tank. The outlet of the secondary gas-water-sludge separator is connected to the fan, and the outlet of the secondary gas-water-sludge separator is connected to the water tank. The inlet of the cooler is connected to the top of the secondary gas-water-sludge separator via a first pipe, and the outlet of the cooler is connected to the secondary gas-water-sludge separator via a second pipe. The bottom of the gas-water-slag separator is connected internally; both the pre-gas-water-slag separator and the secondary gas-water-slag separator include hollow tanks. A water outlet is located at the bottom of the tank, and an air outlet is located at the top. A screen is installed inside the tank. A rinsing port is located on the side wall of the tank above the screen, and an air inlet is located on the side wall of the tank below the screen. Several support blocks are installed on the inner wall of the tank, and the screen is mounted on these blocks. A slag-blocking cover is installed on the inner wall at the air inlet position inside the tank. The bottom of the slag-blocking cover is open, and several through holes are provided on the slag-blocking cover.

2. The papermaking waste gas treatment system according to claim 1, characterized in that, The top of the tank of the secondary gas-water-slag separator is equipped with a pressure gauge and a safety valve via an extension pipe.

3. The papermaking waste gas treatment system according to claim 2, characterized in that, A thermometer is installed at the air inlet of the fan.

4. The papermaking waste gas treatment system according to claim 3, characterized in that, It also includes a control box, which contains a PLC controller that is electrically connected to the barometer, the thermometer, the fan, and the safety valve.

5. The papermaking waste gas treatment system according to claim 1, characterized in that, The cooler is provided with a slag removal port at the top, and a removable cover is provided on the slag removal port.

6. The papermaking waste gas treatment system according to claim 1, characterized in that, The outlet of the pre-gas-water-sludge separator is connected to the water tank via a third pipe, and the outlet of the secondary gas-water-sludge separator is connected to the third pipe via a fourth pipe.

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