Waste gas secondary recovery treatment mechanism of printing and dyeing setting machine

Abstract

The invention provides a waste gas secondary recovery treatment mechanism of a printing and dyeing setting machine, and relates to the field of printing and dyeing setting machines, the waste gas secondary recovery treatment mechanism comprises a treatment tower main body, a plurality of supporting legs are fixedly arranged at the bottom of the treatment tower main body, the supporting legs play a role in stable supporting, a liquid collecting tank is arranged on one side of the treatment tower main body, and a spraying liquid tank is arranged in the liquid collecting tank. A plurality of spray heads distributed in an array are arranged at the top end of the spray liquid tank, and a gas discharge port with an outward opening is formed in one side of the spray liquid tank. According to the device and the method, particulate matters, oil mist, water-soluble VOCs, acid gas and the like are subjected to classified and segmented targeted removal through a multi-stage and multi-mechanism combined purification path of spiral centrifugal primary filtration, fine filtration and chemical spraying washing, the purification efficiency is high, and it is ensured that final emission reaches the standard.

Description

Technical Field

[0001] This invention relates to the field of dyeing and finishing machine technology, specifically to a secondary recovery and treatment mechanism for waste gas from a dyeing and finishing machine. Background Technology

[0002] During the heat setting process in textile dyeing and finishing industries, the high temperature (120-220℃ through the bypass exhaust pipe) causes the volatilization of dye auxiliaries, fiber oils, and coating agents on the fabric, generating exhaust gas containing complex components such as VOCs (e.g., formaldehyde, benzene compounds, esters), particulate matter, oil fumes, hydrogen sulfide, and nitrogen oxides. According to the "Emission Standard of Air Pollutants for Textile Dyeing and Finishing Industry," exhaust gas from the setting machine accounts for 60%-80% of the total exhaust gas volume of the entire plant. It is characterized by high temperature, high humidity, and high oil content: particulate matter concentration of 150-250 mg / m³, oil fume of 40-80 mg / m³, and VOCs concentration of up to 300-500 mg / m³ (for chemical fibers), and also contains recalcitrant substances such as benzene compounds and siloxanes.

[0003] While existing technologies can remove large particles and cool the air, they suffer from drawbacks such as high water consumption, direct discharge of wastewater leading to secondary pollution, inability to recover heat, easy clogging of filters requiring frequent replacement, and the accumulation of solid particles in the exhaust gas during the initial filtration process, which can cause hard clumps on the inner wall of the pipes and affect the efficiency of subsequent filtration. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a secondary recovery and treatment mechanism for waste gas from a dyeing and finishing machine, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a secondary recovery and treatment mechanism for waste gas from a dyeing and setting machine, comprising a treatment tower body, wherein a plurality of supporting legs are fixedly provided at the bottom of the treatment tower body, the supporting legs providing stable support; a liquid collection tank is provided on one side of the treatment tower body, a spray liquid tank is provided in the liquid collection tank, a plurality of arrayed spray heads are provided at the top of the spray liquid tank, and a gas discharge port with an opening facing outward is provided on one side of the spray liquid tank; a main treatment chamber is provided inside the treatment tower body, a maintenance and disassembly plate is provided at the top of the main treatment chamber, a main input pipe extending outward is connected to the top of the maintenance and disassembly plate, one end of the main input pipe is connected to the main treatment chamber, the main treatment chamber serving to filter solid particulate impurities from the waste gas of the dyeing and setting machine, and a waste gas connection port with an opening facing outward is provided at the tail end of the primary filter.

[0006] Preferably, a heat exchanger support frame with a horizontal crossbeam is fixedly installed above the main processing chamber. A plate heat exchanger assembly is installed inside the heat exchanger support frame. The plate heat exchanger assembly consists of several cooling plates. The plate heat exchanger assembly is made of heat exchange plates. A fine filter is installed at the top of the plate heat exchanger assembly. The fine filter has the effect of secondary filtration of exhaust gas.

[0007] Preferably, the bottom of the plate heat exchanger assembly is connected to an induced draft fan inlet, the induced draft fan inlet extends downward, an induced draft fan assembly is provided in the main processing chamber and below the heat exchanger support frame, the top of the induced draft fan assembly is connected to the induced draft fan inlet, and the bottom of the induced draft fan assembly is connected to a washing air inlet and the downward duct.

[0008] Preferably, a three-way control valve is connected below the downflow conduit, one end of the three-way control valve is connected to the circulation return pipe, and the other end of the three-way control valve is connected to a bypass exhaust pipe, the bottom of the bypass exhaust pipe extending outward.

[0009] Preferably, the other end of the washing air inlet is connected to an exhaust gas outlet pipe. One end of the exhaust gas outlet pipe extends outward and is located above the spray liquid tank. A plurality of connecting branch pipes are connected to one side of the outer end face of the exhaust gas outlet pipe, and the connecting branch pipes are connected to the top of the spray liquid tank.

[0010] Preferably, an emergency cooler is provided on one side of the main body of the processing tower, and a cooler connecting pipe is connected to the top of the emergency cooler. The cooler connecting pipe is connected to the side of the main input pipe, and a cooling return pipe is connected to the other side of the emergency cooler. One end of the cooling return pipe extends into the main processing chamber.

[0011] Preferably, the primary filter is provided with a spiral airflow channel, and the spiral airflow channel is provided with a threaded spiral filter element, which guides the airflow in a spiral manner.

[0012] Preferably, a filter monitoring housing is installed on one side of the outer end face of the primary filter, and linear drive rails are respectively installed on both sides of the filter monitoring housing. The linear drive rails are provided with movable drive sliders.

[0013] Preferably, a monitoring mechanism mounting base is provided on one side of the top of the filter monitoring housing. The monitoring mechanism mounting base is provided with an outward-opening detection sliding rail. A movable particulate matter detector head is provided in the detection sliding rail. Arc-shaped detection arms are respectively installed and connected to both ends of the particulate matter detector head. The other end of the detection arm is fixedly connected to the drive slider.

[0014] Preferably, one end of the particulate matter detector is equipped with a wireless signal transmitter, and the wireless signal transmitter is connected to the particulate matter detector via a signal cable.

[0015] This invention provides a secondary recovery and treatment mechanism for waste gas from a dyeing and finishing machine. It has the following beneficial effects: 1. This invention, through the synergistic design of plate heat exchanger group and waste heat preheating spray liquid, systematically recovers high-grade and low-grade heat energy in waste gas, significantly reducing the energy consumption of the dyeing and setting machine itself and the energy consumption of subsequent processing units, resulting in a significant improvement in overall energy efficiency.

[0016] 2. This invention, through an emergency cooler and its control logic, ensures that the core heat exchange unit always operates within the optimal temperature range, thus protecting the equipment and maintaining the continuity of high heat recovery efficiency.

[0017] 3. This invention employs a multi-stage, multi-mechanism purification path combining spiral centrifugal primary filtration, fine filtration, and chemical spray washing to classify and target the removal of particulate matter, oil mist, water-soluble VOCs, and acidic gases in stages, achieving high purification efficiency and ensuring that final emissions meet standards.

[0018] 4. This invention, through a particulate matter detector based on the principle of laser scattering, a linear drive mechanism, and a wireless transmission system, can remotely, in real time, and accurately monitor the clogging status of the primary filter, changing passive and frequent periodic replacement to proactive and precise on-demand maintenance, effectively avoiding problems such as increased system air resistance, decreased processing efficiency, and even downtime for maintenance caused by filter clogging. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a front view of the external structure of the present invention; Figure 3 This is a front view of the external structure of the present invention; Figure 4 This is a side view of the external structure of the present invention; Figure 5 For the present invention Figure 4 A cross-sectional view along the AA direction; Figure 6 This is a schematic diagram of the external structure of the primary filter 112 component of the present invention; Figure 7 For the present invention Figure 6 Cross-sectional view along the BB direction.

[0020] In the diagram: 101. Treatment tower body; 102. Support leg; 103. Emergency cooler; 104. Cooler connecting pipe; 105. Exhaust gas connection port; 106. Filter monitoring housing; 108. Main input pipe; 110. Exhaust gas output pipe; 111. Connecting branch pipe; 112. Primary filter; 113. Liquid collection tank; 114. Cooling return gas pipe; 115. Maintenance and disassembly plate; 116. Spray head; 117. Gas exhaust port; 118. Circulation return pipe; 119. Spray liquid tank; 120. Bypass exhaust pipe; 121. Three-way control. 122. Valve; 123. Main processing chamber; 124. Downflow duct; 125. Exhaust fan unit; 126. Exhaust fan inlet; 127. Plate heat exchanger assembly; 128. Fine filter; 129. Heat exchanger support frame; 130. Scrubber inlet; 131. Linear drive guide rail; 132. Drive slider; 133. Monitoring mechanism mounting base; 134. Detection moving slide rail; 135. Particulate matter detector head; 136. Detection arm; 137. Signal cable; 138. Wireless signal transmitter; 139. Spiral filter airflow channel; 130. Spiral filter element. Detailed Implementation

[0021] This invention provides a secondary recovery and treatment mechanism for waste gas from a dyeing and finishing machine, such as... Figure 1-7 As shown, the system includes a treatment tower body 101. Several support legs 102 are fixedly installed at the bottom of the treatment tower body 101, providing stable support. A liquid collection tank 113 is provided on one side of the treatment tower body 101. A spray liquid tank 119 is provided inside the liquid collection tank 113. Several arrayed spray heads 116 are provided at the top of the spray liquid tank 119. A gas exhaust port 117 with an outward opening is provided on one side of the spray liquid tank 119. A main treatment chamber 122 is provided inside the treatment tower body 101. A maintenance and disassembly plate 115 is provided at the top of the main treatment chamber 122. A main input pipe 108 extending outward is connected to the top of the maintenance and disassembly plate 115. One end of the main input pipe 108 is connected to the main treatment chamber 122. The main treatment chamber 122 filters solid particulate impurities from the exhaust gas of the dyeing and setting machine. An exhaust gas connection port 105 with an outward opening is provided at the tail end of the primary filter 112.

[0022] It should be further explained that the spray head 116 serves to connect to the spray liquid pipeline.

[0023] Furthermore, a heat exchanger support frame 128 with a horizontal frame is fixedly installed above the main processing chamber 122. A plate heat exchanger assembly 126 is installed inside the heat exchanger support frame 128. The plate heat exchanger assembly 126 is composed of several cooling plates. The plate heat exchanger assembly 126 is made of heat exchange plates. A fine filter 127 is installed at the top of the plate heat exchanger assembly 126. The fine filter 127 plays a secondary filtration role for the exhaust gas.

[0024] Furthermore, the bottom of the plate heat exchanger assembly 126 is connected to an induced draft fan inlet 125, which extends downward. An induced draft fan assembly 124 is provided inside the main processing chamber 122 and below the heat exchanger support frame 128. The top of the induced draft fan assembly 124 is connected to the induced draft fan inlet 125, and the bottom of the induced draft fan assembly 124 is connected to a washing air inlet 129 and a downward duct 123.

[0025] It is worth further explaining that the induced draft fan unit 124 has a built-in air pump. When the air pump is started, it can draw waste into the induced draft fan inlet 125 and accelerate its discharge to the washing air inlet 129 or the downflow duct 123.

[0026] Furthermore, a three-way control valve 121 is connected to the lower part of the downflow conduit 123. One end of the three-way control valve 121 is connected to the circulation return pipe 118, and the other end of the three-way control valve 121 is connected to a bypass exhaust pipe 120, with the bottom of the bypass exhaust pipe 120 extending outward.

[0027] It should be further explained that the three-way control valve 121 is equipped with a control switching valve, which can control the on / off status of the three-way control valve 121, the circulation return pipe 118, and the bypass exhaust pipe 120, thus achieving the effect of intelligent switching.

[0028] Furthermore, the other end of the washing air inlet 129 is connected to an exhaust gas outlet pipe 110. One end of the exhaust gas outlet pipe 110 extends outward and is located above the spray liquid tank 119. Several connecting branch pipes 111 are connected to one side of the outer end face of the exhaust gas outlet pipe 110. The connecting branch pipes 111 are connected to the top of the spray liquid tank 119.

[0029] Furthermore, an emergency cooler 103 is provided on one side of the main body 101 of the processing tower. A cooler connecting pipe 104 is connected to the top of the emergency cooler 103. The cooler connecting pipe 104 is connected to the side of the main input pipe 108. A cooling return pipe 114 is connected to the other side of the emergency cooler 103. One end of the cooling return pipe 114 extends into the main processing chamber 122.

[0030] It should be noted that a temperature control sensor is installed at the connection point between the cooler connecting pipe 104 and the main input pipe 108. When the temperature control sensor detects that the input waste gas temperature is too high, the emergency cooler 103 is activated, and the waste gas from the main input pipe 108 is drawn into the emergency cooler 103 through the cooler connecting pipe 104 for initial cooling before being returned to the main processing chamber 122. The waste gas is then cooled again through the plate heat exchanger group 126, thereby ensuring the efficiency of waste gas cooling and the efficiency of subsequent waste gas treatment.

[0031] Furthermore, the primary filter 112 is provided with a spiral filter airflow channel 138, and the spiral filter airflow channel 138 is provided with a threaded spiral filter element 139, which guides the airflow in a spiral manner.

[0032] It should be further explained that it extends the input path and achieves the effect of fixing particles in the exhaust gas through the spiral filter element 139.

[0033] Furthermore, a filter monitoring housing 106 is installed on one side of the outer end face of the primary filter 112, and linear drive rails 130 are installed on both sides of the filter monitoring housing 106 respectively. A movable drive slider 131 is provided inside the linear drive rail 130.

[0034] It should be further explained that the start of the linear drive rail 130 can control the drive slider 131 to move along the track of the linear drive rail 130.

[0035] Furthermore, a monitoring mechanism mounting base 132 is provided on one side of the top of the filter monitoring housing 106. The monitoring mechanism mounting base 132 is provided with an outward-facing detection moving slide rail 133. A movable particulate matter detector head 134 is provided in the detection moving slide rail 133. Arc-shaped detection arms 135 are respectively installed and connected to both ends of the particulate matter detector head 134. The other end of the detection arm 135 is fixedly connected to the drive slider 131.

[0036] It should be further explained that the particulate matter detector 134 is used to detect the density of particulate matter on the surface of the spiral filter element 139 inside the primary filter 112.

[0037] Furthermore, a wireless signal transmitter 137 is provided at one end of the particulate matter detector 134, and the wireless signal transmitter 137 is connected to the particulate matter detector 134 via a signal cable 136.

[0038] It should be further explained that the wireless signal transmitter 137 serves as a remote signal connection device. After the particle detector 134 converts the detection signal inside the primary filter 112 into an electrical signal, it is output to the outside through the wireless signal transmitter 137. The wireless signal transmitter 137 can also remotely connect to the control terminal to achieve the effect of remote monitoring. When the particle detector 134 scans and detects that there are too many solid particles of exhaust gas accumulated on the surface of the spiral filter element 139 or in the spiral filter airflow channel 138 during its back-and-forth movement, it can remotely remind the staff to replace it. The particle detector 134 uses the principle of laser scattering for detection.

[0039] When using this solution: S1. The high-temperature exhaust gas of 150-220℃ generated by the dyeing and setting machine first enters the system through the main input pipe 108, and the temperature control sensor located at the connection position between the cooler connecting pipe 104 and the main input pipe 108 monitors it in real time. If the exhaust gas temperature exceeds the preset safety threshold, the system immediately and intelligently starts the emergency cooler 103. Some of the high-temperature exhaust gas is diverted to the cooler for forced pre-cooling. The cooled exhaust gas flows back to the main treatment chamber 122 through the cooling return pipe 114 and mixes with the mainstream exhaust gas. This ensures that the temperature of the exhaust gas entering the core heat exchange zone is within the safe and efficient operating range of the plate heat exchanger group 126, avoiding thermal damage to the subsequent long-term filter material due to overheating and ensuring the durability of the system. Meanwhile, the exhaust gas enters the primary filter 112 and flows through the unique spiral filter airflow channel 138. Under the guidance of the spiral filter element 139, the exhaust gas undergoes centrifugal rotation. Most of the fiber dust and large-diameter particles are efficiently separated and adsorbed onto the inner wall of the channel due to centrifugal force, completing low-resistance, high-efficiency mechanical primary filtration, effectively alleviating the load on the downstream fine processing unit.

[0040] S2. After primary filtration and temperature control, the exhaust gas enters the upper part of the main treatment chamber 122. It first flows through the plate heat exchanger group 126 and exchanges heat fully with the internal circulating refrigerant. The exhaust gas temperature drops significantly to a near dew point temperature of 80-110℃. The high-quality heat energy recovered in this process can be directly reused in the stenter oven or other process links, which greatly reduces production energy consumption. The cooled exhaust gas then passes through the fine filter 127, whose internal ultra-fine glass fiber filter material can effectively capture submicron-sized oil mist and particulate matter that were not removed in the previous stage, achieving deep purification and providing clean gas conditions for subsequent terminal treatment devices such as VOCs catalytic oxidation, thus avoiding catalyst poisoning and deactivation.

[0041] S3. The exhaust gas after heat exchange and fine filtration is drawn through the exhaust fan inlet 125 by the stable power provided by the induced draft fan unit 124, and the flow direction is intelligently distributed by the three-way control valve 121 according to the preset program. Under normal operating conditions, most of the exhaust gas is transported to the exhaust gas outlet pipe 110 through the washing air inlet 129; In special operating conditions, some of the exhaust gas can be returned to the front end through the recirculation pipe 118 to adjust the reaction conditions, or emergency discharge can be carried out through the bypass exhaust pipe 120.

[0042] S3.1 Under normal process conditions, the exhaust gas is evenly distributed above the spray liquid tank 119 through the connecting branch pipe 111. The array of spray heads 116 fully atomizes the circulating spray liquid and makes countercurrent contact with the downward exhaust gas. This process realizes secondary recovery.

[0043] S3.2 High-efficiency washing removes residual water-soluble VOCs (such as some aldehydes), SO2, NOx and trace amounts of aerosols that penetrate into the exhaust gas; By utilizing the residual heat of the exhaust gas to maintain the temperature of the spray liquid, the chemical washing reaction rate is increased on the one hand, and on the other hand, this part of low-grade heat energy can be used to preheat process water, realizing the cascade utilization of energy. After washing, the clean gas is de-misted and dehydrated before being discharged through gas outlet 117 in compliance with standards. The spray liquid settles in the collection tank 113, and the floating oil and sediment are periodically discharged through the slag outlet 117, while the clear liquid can be recycled, thus preventing the direct discharge of washing wastewater from the source and avoiding secondary pollution.

[0044] S4. During equipment operation, the linear drive rail 130 is periodically started, driving the drive slider 131 and the connected detection arm 135 and particulate matter detection head 134 to perform non-contact full-area scanning of the surface of the spiral filter element 139 along the detection moving slide rail 133. The particulate matter detector 134 detects and quantifies the particle packing density on the surface of the filter medium in real time. The data is transmitted to the wireless signal transmitter 137 via the signal cable 136 and sent to the central control room remotely and in real time. When the system algorithm determines that the buildup density has reached the critical value, it immediately issues an early warning to the staff, guiding them to clean or replace the filter at the best time. This solves the problems of easy clogging and frequent replacement of the filter and hard clumps on the inner wall of the pipe. It transforms passive maintenance into proactive and predictive maintenance, greatly improving the continuity and stability of the system operation and reducing long-term operation and maintenance costs.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A secondary recovery and treatment mechanism for waste gas from a dyeing and setting machine, comprising a treatment tower body (101), characterized in that: The bottom of the processing tower body (101) is fixed with several support feet (102), which provide stable support. A liquid collection tank (113) is provided on one side of the processing tower body (101), and a spray liquid tank (119) is provided inside the liquid collection tank (113). Several arrayed spray heads (116) are provided at the top of the spray liquid tank (119). A gas discharge port (117) with an outward opening is provided on one side of the spray liquid tank (119). The processing tower body ( 101) is provided with a main processing chamber (122), and the top of the main processing chamber (122) is provided with a maintenance and disassembly plate (115). The top of the maintenance and disassembly plate (115) is connected to an outwardly extending main input pipe (108). One end of the main input pipe (108) is connected to the main processing chamber (122). The main processing chamber (122) serves to filter solid particulate impurities in the exhaust gas of the dyeing and finishing machine. The tail end of the primary filter (112) is provided with an exhaust gas connection port (105) with an outward opening.

2. The waste gas secondary recovery and treatment mechanism for a dyeing and setting machine according to claim 1, characterized in that: The main processing chamber (122) is fixedly equipped with a heat exchanger support frame (128) with a horizontal frame. The heat exchanger support frame (128) is equipped with a plate heat exchanger assembly (126). The plate heat exchanger assembly (126) is composed of several cooling plates. The plate heat exchanger assembly (126) is made of heat exchange plates. A fine filter (127) is installed at the top of the plate heat exchanger assembly (126). The fine filter (127) plays a secondary filtration role for the exhaust gas.

3. The waste gas secondary recovery and treatment mechanism for a dyeing and setting machine according to claim 2, characterized in that: The bottom of the plate heat exchanger assembly (126) is connected to an induced draft fan inlet (125), which extends downward. An induced draft fan assembly (124) is provided inside the main processing chamber (122) and below the heat exchanger support frame (128). The top of the induced draft fan assembly (124) is connected to the induced draft fan inlet (125), and the bottom of the induced draft fan assembly (124) is connected to a washing air inlet (129) and the downward duct (123).

4. The waste gas secondary recovery and treatment mechanism for a dyeing and setting machine according to claim 3, characterized in that: A three-way control valve (121) is connected below the downflow conduit (123). One end of the three-way control valve (121) is connected to the circulation return pipe (118), and the other end of the three-way control valve (121) is connected to a bypass exhaust pipe (120). The bottom of the bypass exhaust pipe (120) extends outward.

5. The waste gas secondary recovery and treatment mechanism for a dyeing and setting machine according to claim 1, characterized in that: The other end of the washing air inlet (129) is connected to an exhaust gas outlet pipe (110). One end of the exhaust gas outlet pipe (110) extends outward and is located above the spray liquid tank (119). A number of connecting branch pipes (111) are connected to one side of the outer end face of the exhaust gas outlet pipe (110). The connecting branch pipes (111) are connected to the top of the spray liquid tank (119).

6. The waste gas secondary recovery and treatment mechanism for a dyeing and setting machine according to claim 1, characterized in that: An emergency cooler (103) is provided on one side of the main body (101) of the processing tower. A cooler connecting pipe (104) is connected to the top of the emergency cooler (103). The cooler connecting pipe (104) is connected to the side of the main input pipe (108). A cooling return pipe (114) is connected to the other side of the emergency cooler (103). One end of the cooling return pipe (114) extends into the main processing chamber (122).

7. The waste gas secondary recovery and treatment mechanism for a dyeing and setting machine according to claim 1, characterized in that: The primary filter (112) is provided with a spiral filter airflow channel (138), and the spiral filter airflow channel (138) is provided with a threaded spiral filter element (139), which guides the airflow in a spiral manner.

8. The waste gas secondary recovery and treatment mechanism for a dyeing and setting machine according to claim 7, characterized in that: A filter monitoring housing (106) is installed on one side of the outer end face of the primary filter (112). Linear drive rails (130) are installed on both sides of the filter monitoring housing (106). A movable drive slider (131) is provided inside the linear drive rail (130).

9. The waste gas secondary recovery and treatment mechanism for a dyeing and setting machine according to claim 8, characterized in that: The top side of the filter monitoring housing (106) is provided with a monitoring mechanism mounting base (132). The monitoring mechanism mounting base (132) is provided with an outward-facing detection moving slide rail (133). The detection moving slide rail (133) is provided with a particulate matter detector (134). Arc-shaped detection arms (135) are respectively installed and connected to both ends of the particulate matter detector (134). The other end of the detection arm (135) is fixedly connected to the drive slider (131).

10. The waste gas secondary recovery and treatment mechanism for a dyeing and setting machine according to claim 9, characterized in that: The particulate matter detector (134) is equipped with a wireless signal transmitter (137) at one end, and the wireless signal transmitter (137) is connected to the particulate matter detector (134) via a signal cable (136).

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