Waste heat grading recovery system of setting machine

Abstract

The invention discloses a waste heat grading recovery system of a setting machine. The waste heat grading recovery system comprises waste heat recovery main equipment, a waste gas distribution pipe, a fresh air filter and a fresh air distribution system, low-grade waste gas from the two ends of the setting machine is fed into the second waste heat recovery main equipment unit through a waste gas distribution pipe to be subjected to primary heat exchange and then discharged, and high-grade waste gas with high calorific value from the middle section of the setting machine is sequentially subjected to secondary heat exchange through the first waste heat recovery main equipment unit and the second waste heat recovery main equipment unit and then discharged. Waste heat recovery of different flows is carried out on different grades of waste gas entering the waste heat recovery main equipment; high-grade and low-grade waste gas entering the waste heat recovery main equipment is subjected to heat exchange in different processes, and the heat energy grade of heat exchange fresh air can be improved.

Description

Technical Field

[0001] The invention belongs to the field of energy, and relates to waste heat recovery equipment, in particular to a grading waste heat recovery system for a setting machine. Background Art

[0002] The setting machine will generate a large amount of high-temperature waste gas during operation, which contains a large amount of heat energy. If the waste heat is not recovered, the heat energy will be directly discharged into the atmosphere, resulting in energy waste. Through waste heat recovery technology, the heat energy in these waste gases can be extracted and reused in the production process or used in other links that require heat energy, thereby reducing the demand for external energy and reducing energy consumption. Waste heat recovery can make fuller use of energy in the production system, convert the originally wasted heat energy into usable energy, improve the energy utilization efficiency of the entire production process, maximize the utilization of energy, realize the cascade utilization of energy, and reduce the ineffective loss of energy.

[0003] The setting machine usually uses coal, natural gas and other energy sources, and a large amount of greenhouse gases such as carbon dioxide will be generated during the combustion process. Through waste heat recovery, the demand for primary energy is reduced, and accordingly the emission of greenhouse gases during energy combustion is reduced, which helps to alleviate the pressure of global warming and has positive significance for environmental protection. The reduction in energy consumption means less fuel is burned, thereby reducing the emission of pollutants such as sulfur dioxide, nitrogen oxides, and dust, reducing pollution to the atmospheric environment, helping to improve air quality, and reducing the occurrence of environmental problems such as acid rain. The recovered waste heat can be used to preheat air, heat water or other production links, reducing the cost of purchasing new energy, directly reducing the energy cost of the enterprise, and improving the economic benefits of the enterprise.

[0004] The setting machine is usually composed of multiple sections of heating ovens. During the setting process, the textile fabrics enter each oven in sequence for drying and setting. Usually, the temperature of the ovens at both ends of the setting machine is lower than that of the oven in the middle section due to the need to pre-dry the wet cloth and cool down the tail oven. The calorific value of waste heat from different locations is different. If a unified waste heat recovery strategy and equipment are used, the quality of the waste heat gas will be reduced after mixing low-grade waste heat and high-grade waste heat, which will lead to a reduction in the thermal quality of the heat exchange fresh air. According to the characteristics of the setting machine waste gas, which contains high-grade and low-grade waste heat, different processes are carried out for graded recovery to improve the overall recovery efficiency. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a grading waste heat recovery system for a stenter, which can recover low-grade waste heat and high-grade waste heat separately, thereby improving the waste heat recovery efficiency of the system and reducing operating energy consumption.

[0006] The present invention is achieved through the following technical solutions:

[0007] A grading waste heat recovery system for a setting machine, comprising a waste heat recovery main device, a waste gas distribution pipe and a fresh air distribution system;

[0008] The waste heat recovery main equipment comprises a waste heat recovery main equipment unit 1 and a waste heat recovery main equipment unit 2 arranged on the upper part of the setting machine, the waste heat recovery main equipment unit 1 is arranged on the side close to the front end cloth inlet of the setting machine, the waste heat recovery main equipment unit 2 is arranged close to the waste heat recovery main equipment unit 1 and on the rear side of the waste heat recovery main equipment unit 1, and the waste heat recovery main equipment unit 2 is provided with an exhaust gas exhaust port as the system exhaust gas outlet; the waste heat recovery main equipment unit 1 and the waste heat recovery main equipment unit 2 are provided with a fresh air duct, the fresh air duct of the waste heat recovery main equipment unit 2 is used as the system fresh air inlet, and the fresh air duct outlet of the waste heat recovery main equipment unit 1 is used as the system fresh air outlet; one side of the fresh air distribution system is connected with the system fresh air duct outlet, and the other side is connected with the setting machine chassis, and the fresh air after heat exchange and heat absorption is transported to different positions of the setting machine chassis through the fresh air distribution system;

[0009] The low-grade waste gas from both ends of the setting machine is sent to the waste heat recovery main equipment unit 2 through the waste gas distribution pipe for one heat exchange and then discharged. The high-grade waste gas with high calorific value from the middle section of the setting machine is successively sent through the waste heat recovery main equipment unit 1 and the waste heat recovery main equipment unit 2 for two heat exchanges and then discharged. Waste gases of different grades entering the waste heat recovery main equipment are subjected to different processes of waste heat recovery.

[0010] Preferably, the exhaust gas distribution pipe includes an exhaust gas right pipe, an exhaust gas left pipe, a first exhaust gas exhaust pipe at the cloth outlet, a second exhaust gas exhaust pipe at the cloth outlet, a first front exhaust gas exhaust pipe, a second front exhaust gas exhaust pipe, a second box exhaust gas exhaust pipe and an exhaust gas mixing pipe;

[0011] The middle box of the setting machine is connected to the waste heat recovery main equipment unit 1 through the right exhaust pipe and the left exhaust pipe respectively; the front end of the setting machine is connected to the exhaust mixing pipe through the front exhaust exhaust pipe 1 and the front exhaust exhaust pipe 2 respectively, the second box near the front end of the setting machine is connected to the exhaust mixing pipe through the second box exhaust exhaust pipe, and the side of the cloth outlet at the rear end of the setting machine is connected to the exhaust mixing pipe through the cloth outlet exhaust exhaust pipe 1 and the cloth outlet exhaust exhaust pipe 2 respectively;

[0012] The waste gas mixing pipe is connected with the waste gas inlet of the second waste heat recovery main equipment unit. The high-grade waste gas discharged from the middle box of the setting machine is sent to the first waste heat recovery main equipment unit through the waste gas right pipe and the waste gas left pipe for the first heat exchange. The waste gas after heat exchange in the first waste heat recovery main equipment unit is discharged into the waste gas mixing pipe and sent to the second waste heat recovery main equipment unit for heat exchange together with the low-grade waste gas transported from both ends of the setting machine entering the waste gas mixing pipe. The waste gas after heat exchange in the second waste heat recovery main equipment unit is discharged from the waste gas exhaust port and enters the waste gas purification link.

[0013] Preferably, the waste heat recovery main equipment unit 1 and the waste heat recovery main equipment unit 2 are both composed of a plurality of single heat exchanger boxes, each of which includes an upper air duct, a lower air duct and a fresh air duct;

[0014] The upper air duct and the lower air duct of the monomer heat exchanger box are two box structures distributed up and down, and the upper air duct and the lower air duct are connected by wall panels to form a fresh air duct, and a heat exchange component is arranged in the fresh air duct; the heat medium inlet and the heat medium outlet of the heat exchange component are respectively connected with the upper air duct and the lower air duct, and the fresh air duct is respectively provided with a fresh air inlet and a fresh air outlet in the horizontal direction; the fresh air ducts of all the monomer heat exchanger boxes in the waste heat recovery main equipment unit 1 and the waste heat recovery main equipment unit 2 are connected to form the fresh air duct of the system; the fresh air duct of the monomer heat exchanger box at the rear end of the waste heat recovery main equipment unit 2 serves as the fresh air inlet of the system, and the fresh air duct of the monomer heat exchanger box at the front end of the waste heat recovery main equipment unit 1 serves as the fresh air outlet of the system.

[0015] Preferably, the lower air ducts of all the monomer heat exchanger boxes in the waste heat recovery main equipment unit 1 and the waste heat recovery main equipment unit 2 are connected to form an exhaust gas mixing pipe of the waste heat graded recovery system of the setting machine; the upper air ducts of all the monomer heat exchanger boxes in the waste heat recovery main equipment unit 1 serve as the exhaust gas inlet of the waste heat recovery main equipment unit 1, and the high-grade exhaust gas is sent in from the upper air duct, and enters the exhaust gas mixing pipe after heat exchange with fresh air in each monomer heat exchanger box of the waste heat recovery main equipment unit 1;

[0016] The downwind ducts of all the individual heat exchanger boxes in the waste heat recovery main equipment unit 2 serve as the waste gas inlet of the waste heat recovery main equipment unit 2. The low-grade waste gas from the waste gas mixing pipe enters the individual heat exchanger boxes of the waste heat recovery main equipment unit 2 through the downwind duct in the waste heat recovery main equipment unit 2, exchanges heat with the fresh air, and then is discharged through the waste gas exhaust port set in the waste heat recovery main equipment unit 2.

[0017] Preferably, the upper air ducts of all the monomer heat exchanger boxes in the waste heat recovery main equipment unit 1 are connected to form a heat exchanger box group, and the upper air ducts of several of the monomer heat exchanger boxes in the heat exchanger box group serve as exhaust gas inlets; the upper air ducts of all the monomer heat exchanger boxes in the waste heat recovery main equipment unit 2 are connected, and the upper air ducts of several of the monomer heat exchanger boxes serve as exhaust gas outlets of the system.

[0018] Preferably, the fresh air distribution system includes a fresh air distribution box connected to the outlet of the system fresh air duct and a plurality of air supply pipes connected to the fresh air distribution box, each air supply pipe is connected to a different box of the molding machine; a fresh air filter is arranged at the inlet of the system fresh air duct.

[0019] Preferably, the heat exchange assembly is a plurality of heat exchange tubes arranged vertically, and both ends of the heat exchange tubes are respectively connected to the upper air duct and the lower air duct.

[0020] Preferably, the heat exchange tube is a straight tube structure with a smooth inner wall.

[0021] Preferably, a heat exchange component flushing mechanism is provided in the upper air duct of the monomer heat exchanger box, and the flushing mechanism includes a horizontally arranged flushing pipe and a plurality of horizontally arranged flushing branches connected to the flushing pipe, and a wastewater pipe is provided in the lower air duct; the flushing branch pipe is erected above a plurality of heat exchange tubes, and a nozzle is provided at the bottom of each flushing branch pipe, and each nozzle is facing a heat exchange tube.

[0022] Preferably, fins are provided on the outer surface of the heat exchange tube.

[0023] The technical solution of the present invention has the following advantages:

[0024] The waste heat recovery main equipment includes two heat exchange equipments, the waste heat recovery main equipment unit 1 and the waste heat recovery main equipment unit 2. The low-grade waste gas from both ends of the setting machine enters the waste heat recovery main equipment unit 2 for one heat exchange and then is discharged. The high-grade waste gas with high calorific value from the middle section of the setting machine passes through the waste heat recovery main equipment unit 1 and the waste heat recovery main equipment unit 2 in turn and then is discharged. The waste heat of different grades entering the waste heat recovery main equipment is recovered in different processes; the high-grade waste gas contains more available heat and has a higher temperature and calorific value. By allowing it to pass through the waste heat recovery main equipment unit 1 and the waste heat recovery main equipment unit 2 for two heat exchanges in turn, the heat it carries is transferred to the fresh air to the greatest extent, realizing deep heat recovery. Make full use of the heat energy in the high-grade waste gas to improve the overall waste heat recovery efficiency. Although the heat of low-grade waste gas is relatively small, by introducing it into the waste heat recovery main equipment unit 2 for one heat exchange, part of the heat can also be recovered to avoid the waste of this part of energy. By treating waste gases of different qualities separately, the entire system can carry out targeted recovery of energy of different qualities, thus improving the comprehensiveness and integrity of energy recovery.

[0025] By diverting waste gases of different grades, the temperature fluctuation and thermal shock caused by mixing waste gases of different grades into the same heat exchange equipment can be avoided. High-grade waste gases usually have a higher temperature. If they are directly mixed with low-grade waste gases and enter the same heat exchange equipment, the thermal grade of the waste gases will be reduced, resulting in a decrease in the overall heat recovery efficiency of the system.

[0026] For high-grade waste heat areas, more heat exchange area is used for heat exchange to fully utilize its high-grade thermal energy; for low-grade waste heat areas, appropriate heat exchange area is used for heat exchange to effectively improve the overall quality of the heat exchange fresh air.

[0027] The downwind ducts of all the individual heat exchanger boxes in the waste heat recovery main equipment unit 1 and the waste heat recovery main equipment unit 2 are connected to form an exhaust gas mixing pipe. The downwind ducts of all the individual heat exchanger boxes in the waste heat recovery main equipment unit 2 serve as the exhaust gas inlet, providing a continuous flow channel for the exhaust gas, ensuring that the exhaust gas after heat exchange can be smoothly discharged from the waste heat recovery main equipment unit 1 and smoothly enter the waste heat recovery main equipment unit 2, avoiding the waste gas retention phenomenon caused by the lack of connectivity or flow obstruction of the pipeline, and ensuring that the heat exchange process is carried out under relatively stable conditions. When the exhaust gas can be quickly discharged from the waste heat recovery main equipment unit 1 and enter the waste heat recovery main equipment unit 2, the hierarchical transfer of heat can be better realized, avoiding the local temperature being too high or too low due to the poor flow of the exhaust gas, so that the heat exchange equipment at different stages can better play its advantages and improve the overall heat exchange efficiency.

[0028] The upper air ducts of all the monomer heat exchanger boxes are connected to form a heat exchanger box group, and the upper air ducts of several of the monomer heat exchanger boxes are used as the exhaust gas inlet, and the inlet is simultaneously connected to all the monomer heat exchanger boxes through the upper air duct. Since the exhaust gas inlet is simultaneously connected to all the monomer heat exchanger boxes through the upper air duct in the heat exchanger box group, the exhaust gas can be evenly distributed in all the monomer heat exchanger boxes. Avoid the problem of uneven local heat exchange caused by excessive or small local exhaust gas flow. When the exhaust gas enters each monomer heat exchanger box evenly, each monomer heat exchanger can give full play to its heat exchange capacity, ensuring that the heat exchange process in the entire waste heat recovery main equipment unit is more uniform and stable. Uniform exhaust gas distribution can make the heat exchange medium in each monomer heat exchanger box work under relatively stable conditions, avoiding local temperature changes and fluctuations in heat exchange efficiency caused by uneven exhaust gas flow. It can also ensure that each individual heat exchanger within the entire waste heat recovery main equipment unit can participate in the heat exchange process, avoiding idleness or overload of some equipment, thereby making full use of the overall heat exchange capacity of the equipment and improving the overall performance of the waste heat recovery system.

[0029] The exhaust gas distribution pipes of the heat exchange equipment of the setting machine are symmetrically arranged on the left and right sides of the main waste heat recovery equipment, with a stacked distribution, and the overall structure is compact and the layout is reasonable. The symmetrical arrangement of the exhaust gas distribution pipes allows the exhaust gas to enter the two sides of the main waste heat recovery equipment more evenly, and the low-temperature fresh air in the main waste heat recovery equipment can receive heat more stably, thereby improving the overall heat exchange efficiency. The compact layout of the exhaust gas distribution pipes shortens the distance that heat is lost during the transfer process, reducing the heat loss during the transfer to the waste heat recovery equipment. The symmetrical layout makes full use of the space where the equipment is located, reducing the floor space or space volume of the equipment. The symmetrical layout ensures that the flow of exhaust gas in the pipeline is more stable and smooth. Uneven pipeline layout will lead to the generation of local eddies and turbulence, increasing energy loss, while the symmetrical layout helps to form a relatively regular laminar flow or transition flow, reducing energy loss and improving equipment operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a three-dimensional diagram of the waste heat classification recovery system of the setting machine of the present invention;

[0031] Figure 2 This is a right view of the waste heat classification recovery system of the setting machine of the present invention;

[0032] Figure 3 This is a left view of the waste heat classification recovery system of the setting machine of the present invention;

[0033] Figure 4 This is a front view of the waste heat classification recovery system of the setting machine of the present invention;

[0034] Figure 5 It is a front view of the single heat exchanger box in the present invention;

[0035] Figure 6 It is a side view of the monomer heat exchanger box in the present invention;

[0036] Figure 7 The three-dimensional structure of the single heat exchanger box in the present invention Figure 1 ;

[0037] Figure 8 for Figure 7 A partial enlarged view of the middle part;

[0038] Fig. 9 The three-dimensional structure of the single heat exchanger box in the present invention Figure 2 ;

[0039] In the figure: 1-forming machine, 2-right exhaust pipe, 3-left exhaust pipe, 4-exhaust exhaust pipe 1 at the cloth outlet, 5-exhaust exhaust pipe 2 at the cloth outlet, 6-front exhaust pipe 1, 7-front exhaust pipe 2, 8-main equipment unit 1 for waste heat recovery, 9-main equipment unit 2 for waste heat recovery, 10-exhaust exhaust pipe 1, 11-exhaust exhaust pipe 2, 12-fresh air filter, 13-fresh air distribution box, 14-right fresh air supply pipe, 15-left fresh air supply pipe, 16-second box exhaust pipe, 1-1-upper air duct, 1-2-lower air duct, 1-3-fresh air duct, 1-4-flushing pipe, 1-5-wastewater pipe, 1-6-inspection port, 1-7-heat exchange pipe. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0041] like Figure 1-Figure 4As shown, the grading recovery system of waste heat of the setting machine of the present invention comprises a waste heat recovery main device, an exhaust gas distribution pipe, a fresh air filter 12 and a fresh air distribution system. The waste heat recovery main device comprises two heat exchange devices, namely, a waste heat recovery main device unit 1 8 and a waste heat recovery main device unit 2 9. The waste gas of different grades at different positions of the setting machine is sent to the waste heat recovery main device through the exhaust gas distribution pipe. According to the different grades of the waste gas, the low-grade waste gas from both ends of the setting machine 1 enters the waste heat recovery main device unit 2 9 for one heat exchange and then is discharged. The high-grade waste gas with high calorific value from the middle section of the setting machine passes through the waste heat recovery main device unit 1 8 and the waste heat recovery main device unit 2 9 in turn and then is discharged after two heat exchanges. The waste gas of different grades entering the waste heat recovery main device is subjected to waste heat recovery in different processes. The low-temperature fresh air that enters the waste heat recovery main equipment through the fresh air filter passes through the waste heat recovery main equipment unit 1 8 and the waste heat recovery main equipment unit 2 9 to exchange heat with waste gases of different grades, and the fresh air after absorbing heat is sent to different shaped machine boxes through the fresh air distribution system.

[0042] like Figure 1-Figure 3 As shown, the waste heat recovery main equipment unit 1 8 and the waste heat recovery main equipment unit 2 9 are arranged on the upper part of the setting machine 1, the waste heat recovery main equipment unit 1 8 is arranged on the side close to the front end cloth inlet of the setting machine 1, and the waste heat recovery main equipment unit 2 9 is arranged on the rear side of the waste heat recovery main equipment unit 1 8 close to the waste heat recovery main equipment unit 1 8. The waste heat recovery main equipment unit 1 8 and the waste heat recovery main equipment unit 2 9 are provided with fresh air ducts, the fresh air duct of the waste heat recovery main equipment unit 2 9 serves as the fresh air inlet of the waste heat graded recovery system of the setting machine, and the fresh air duct outlet of the waste heat recovery main equipment unit 1 8 serves as the fresh air outlet of the waste heat graded recovery system of the setting machine. The waste heat recovery main equipment unit 2 9 is provided with an exhaust gas exhaust port as the system exhaust gas outlet, and the fresh air filter 12 is arranged at the fresh air duct inlet. One side of the fresh air distribution system is connected to the fresh air duct outlet and the other side is connected to the setting machine 1 box body. The fresh air after heat exchange and heat absorption is transported to different positions of the setting machine box body through the fresh air distribution system. The fresh air distribution system includes a fresh air distribution box 13 connected to the outlet of the fresh air duct and a plurality of air supply pipes connected to the fresh air distribution box 13, and each air supply pipe is connected to a different box of the setting machine.

[0043] like Figure 1As shown, the exhaust gas distribution pipe includes an exhaust gas right pipe 2, an exhaust gas left pipe 3, an exhaust gas exhaust pipe 1 4 at the cloth outlet, an exhaust gas exhaust pipe 2 5 at the cloth outlet, a front exhaust gas exhaust pipe 1 6, a front exhaust gas exhaust pipe 2 7, a second box exhaust gas exhaust pipe 16 and an exhaust gas mixing pipe; the middle box of the setting machine 1 is connected to the exhaust gas right pipe 2 and the exhaust gas left pipe 3 arranged on both sides of the waste heat recovery main equipment unit 1 8 and the waste heat recovery main equipment unit 2 9 through pipelines, and the exhaust gas right pipe 2 and the exhaust gas left pipe 3 are connected to the waste heat recovery main equipment unit 1 8 and the waste heat recovery main equipment unit 2 9 through pipelines. 3 is connected with the waste heat recovery main equipment unit 8; the front end of the shaping machine 1 is connected with the exhaust gas mixing pipe through the front exhaust gas exhaust pipe 1 6 and the front exhaust gas exhaust pipe 2 7 respectively, the second box body near the front end of the shaping machine 1 is connected with the exhaust gas mixing pipe through the second box exhaust gas exhaust pipe 16, and the cloth outlet side of the rear end of the shaping machine 1 is connected with the exhaust gas mixing pipe through the cloth outlet exhaust gas exhaust pipe 1 4 and the cloth outlet exhaust gas exhaust pipe 2 5 arranged below the exhaust right pipe 2 and the exhaust left pipe 3 respectively.

[0044] The waste gas mixing pipe is connected with the waste gas inlet of the waste heat recovery main equipment unit 2 9. The high-grade waste gas discharged from the middle box of the shaping machine 1 is respectively sent to the waste heat recovery main equipment unit 1 8 through the waste gas right pipe 2 and the waste gas left pipe 3 for the first heat exchange. The waste gas after heat exchange in the waste heat recovery main equipment unit 8 is discharged into the waste gas mixing pipe and sent to the waste heat recovery main equipment unit 2 9 for heat exchange together with the low-grade waste gas transported from both ends of the shaping machine entering the waste gas mixing pipe. The waste gas after heat exchange in the waste heat recovery main equipment unit 2 9 is discharged from the waste gas exhaust port and enters the waste gas purification link.

[0045] like Figure 5-Figure 9 As shown, the waste heat recovery main equipment unit 1 8 and the waste heat recovery main equipment unit 2 9 are both composed of a plurality of monomer heat exchanger boxes, each of which includes an upper air duct 1-1, a lower air duct 1-2, a fresh air duct 1-3, a flushing pipe 1-4, a wastewater pipe 1-5, an inspection port 1-6 and a heat exchange tube 1-7.

[0046] The upper air duct 1-1 and the lower air duct 1-2 of each monomer heat exchanger box are two box structures distributed up and down. The upper air duct 1-1 and the lower air duct 1-2 are connected by wall panels to form a fresh air duct 1-3. A heat exchange component is arranged in the fresh air duct 1-3. The heat medium inlet and the heat medium outlet of the heat exchange component are respectively connected with the upper air duct 1-1 and the lower air duct 1-2. The fresh air duct 1-3 has a fresh air inlet on one side and a fresh air outlet on the other side in the horizontal direction. The fresh air ducts 1-3 of all the monomer heat exchanger boxes in the waste heat recovery main equipment unit 1 8 and the waste heat recovery main equipment unit 2 9 are connected to form the fresh air duct of the waste heat graded recovery system of the setting machine; the fresh air duct 1-3 of the monomer heat exchanger box at the rear end of the waste heat recovery main equipment unit 2 9 serves as the system fresh air inlet, and the fresh air duct 1-3 of the monomer heat exchanger box at the front end of the waste heat recovery main equipment unit 1 8 serves as the system fresh air outlet.

[0047] like Figure 1-Figure 3 As shown, the lower air ducts 1-2 of all the monomer heat exchanger boxes in the waste heat recovery main equipment unit 1-8 and the waste heat recovery main equipment unit 2-9 are connected to form the waste gas mixing tube of the waste heat graded recovery system of the setting machine. The upper air ducts 1-1 of all the monomer heat exchanger boxes in the waste heat recovery main equipment unit 1-8 serve as the waste gas inlet. The high-grade waste gas entering the waste heat recovery main equipment unit 1-8 is sent from the upper air duct 1-1, and enters the waste gas mixing tube after heat exchange with fresh air in each monomer heat exchanger box of the waste heat recovery main equipment unit 1-8. In the waste heat recovery main equipment unit 1-8, the high-grade waste gas of the setting machine enters through the upper air duct 1-1 of the monomer heat exchanger box in the waste heat recovery main equipment unit 1-8, and becomes low-grade waste gas after heat exchange with the fresh air that has been heated once entering through the system fresh air duct. The low-grade waste gas enters the waste gas mixing tube through the lower air duct 1-2, mixes with the low-grade waste gas from both ends of the setting machine, and is sent to the waste heat recovery main equipment unit 2-9.

[0048] The downwind ducts 1-2 of all the individual heat exchanger boxes in the waste heat recovery main equipment unit 29 serve as the exhaust gas inlet. The low-grade exhaust gas from the exhaust gas mixing pipe enters the individual heat exchanger boxes of the waste heat recovery main equipment unit 29 through the downwind ducts 1-2 in the waste heat recovery main equipment unit 29, exchanges heat with the fresh air, and is discharged through the exhaust gas exhaust port set in the waste heat recovery main equipment unit 29 to enter the next purification link. The high-grade exhaust gas efficiently recovers the heat in the waste heat gas through two heat exchanges, and the low-grade exhaust gas only undergoes one heat exchange, and the heat exchange is graded to obtain higher-grade hot fresh air.

[0049] The upper air ducts 1-1 of all the monomer heat exchanger boxes in the waste heat recovery main equipment unit 1 8 are connected to form a heat exchanger box group, wherein the upper air ducts 1-1 of several monomer heat exchanger boxes serve as exhaust gas inlets; the upper air ducts 1-1 of all the monomer heat exchanger boxes in the waste heat recovery main equipment unit 2 9 are connected, wherein the upper air ducts 1-1 of several monomer heat exchanger boxes serve as exhaust gas outlets of the system.

[0050] A heat exchange component flushing mechanism is provided in the upper air duct 1 - 1 of the heat exchanger box, through which impurities and oil stains attached to the inside of the heat exchange component are flushed to ensure that the inside of the heat exchange component pipe is clean.

[0051] In the waste heat recovery main equipment unit 8, the direction of the exhaust gas flow in the single heat exchanger box is from top to bottom. The flushing mechanism is arranged in the upper air duct 1-1 and also sprays high-temperature water vapor or hot steam from top to bottom to flush the inside of the heat exchange component along the exhaust gas flow direction. The flushing liquid can use the flow inertia of the exhaust gas to more forcefully impact the dirt attached to the inner wall of the heat exchange tube. With the dragging force of the exhaust gas, the oil and impurities attached to the heat exchange component can be better washed away, thereby effectively removing dirt accumulation and maintaining a high heat transfer efficiency of the heat exchange tube.

[0052] In the waste heat recovery main equipment unit 1 8, the exhaust gas and flushing water flow in the single heat exchanger box in the same direction. The same-direction flushing can ensure that the flushing medium is evenly distributed in the heat exchange tube and fully advanced along the tube wall, avoiding the problem of uneven local turbulence caused by backflow, causing some areas to be over-flushed and other areas to be under-flushed, and ensuring the consistency of the cleaning effect. A heat exchange component flushing mechanism is also set in the upper air duct 1-1 of the single heat exchanger box of the waste heat recovery main equipment unit 2 9 to achieve the cleaning of the heat exchange components in all the single heat exchanger boxes in the waste heat recovery main equipment unit 2 9.

[0053] like Figure 7 and Figure 8 As shown, the heat exchange assembly is a plurality of heat exchange tubes 1-7 arranged vertically, and the two ends of the heat exchange tubes are connected to the upper air duct 1-1 and the lower air duct 1-2 respectively. The heat exchange tubes are straight tube structures with smooth inner walls. When the exhaust gas flows in the tubes and the fresh air flows outside the tubes, the heat is transferred from the exhaust gas to the fresh air through the tube walls and fins. Due to its smooth inner surface, the exhaust gas with impurities and oil stains has relatively small internal flow resistance, which is particularly suitable for use in scenes with more impurities and oil stains in the exhaust gas.

[0054] The flushing mechanism includes a horizontally arranged flushing pipe 1-4 and a plurality of horizontally arranged flushing branches connected to the flushing pipe 1-4, and a wastewater pipe 1-5 is arranged in the downwind duct 1-2; the flushing branch pipe is erected above a plurality of heat exchange tubes 1-7, and a nozzle is arranged at the bottom of each flushing branch pipe, and each nozzle flushes one heat exchange tube 1-7; the high-temperature and high-pressure flushing liquid is passed through the flushing pipe 1-4 and can enter each flushing branch pipe and be sprayed out from the nozzle to clean the inner wall of the heat exchange tube 1-7, and the oil and impurities that enter the heat exchange tube 1-7 with the exhaust gas can be followed by the water flow and air flow in the heat exchange tube 1-7 to the bottom of the downwind duct 1-2, and discharged from the wastewater pipe 1-5; in this way, the flushing pipe 1-4, the flushing branch pipe and the nozzle realize the cleaning of the inside of the heat exchange tube 1-7 by the flushing mechanism, and reduce the blockage of the heat exchange tube 1-7 by the oil and impurities in the exhaust gas, thereby affecting the heat exchange effect.

[0055] In order to achieve a higher heat exchange effect, the outer surface of the heat exchange tube 1-7 is provided with fins, which are straight in shape and fixed on the heat exchange tube by welding or mechanical means, with a simple structure and low processing cost. Alternatively, corrugated fins with corrugated fin surfaces are used, and common ones are sawtooth corrugations, circular corrugations, etc. Alternatively, louvered fins with fin shapes similar to louver structures are used, which can effectively guide the flow of fresh air and form strong disturbances when the fresh air passes through the fins, thereby improving the heat exchange efficiency. Small holes are provided on the fins, and the presence of the small holes increases the circulation channel of the fresh air, so that the fresh air can contact the fin surface more fully, and at the same time, it can also promote the disturbance of the fresh air, improve the heat transfer efficiency, and reduce the weight of the fins.

[0056] The fins increase the heat exchange area, and at the same time, the fins destroy the fresh air boundary layer and enhance the turbulence of the fresh air. When the fresh air flows through the fin tube, the flow state of the fresh air becomes more complicated due to the presence of the fins, the efficiency of heat transfer is improved, and the heat exchange is effectively enhanced through the fin tube.

[0057] like Fig. 9 As shown, with the use of the heat exchanger, the heat exchange tubes will have scaling, corrosion, leakage and other problems, and the baffles will be damaged. These situations require regular or irregular inspection and treatment of the interior. In order to facilitate maintenance, an inspection port 1-6 is opened on one side of the lower air duct 1-2 of the heat exchanger box. The inspection port 1-6 is convenient for cleaning the dirt deposited inside the lower air duct 1-2, and it is convenient for maintenance personnel to enter or use tools to clean it.

[0058] The inspection port 1-6 is located on the side of the downwind duct 1-2. In order to prevent air leakage and affect the heat exchange efficiency and air outlet effect of the heat exchanger, the inspection port is designed to be sealed. Rubber sealing pads, sealants and other materials are used to ensure the sealing of the inspection port after it is closed.

Claims

1. A grading recovery system for waste heat from a setting machine, characterized by: It includes the main waste heat recovery equipment, waste gas distribution pipe and fresh air distribution system; The waste heat recovery main equipment comprises a waste heat recovery main equipment unit 1 (8) and a waste heat recovery main equipment unit 2 (9) arranged on the upper part of the setting machine (1), the waste heat recovery main equipment unit 1 (8) being arranged on the side close to the front end cloth inlet of the setting machine (1), the waste heat recovery main equipment unit 2 (9) being arranged on the rear side of the waste heat recovery main equipment unit 1 (8) close to the waste heat recovery main equipment unit 1 (8), and the waste heat recovery main equipment unit 2 (9) being provided with an exhaust gas exhaust port as the system exhaust gas outlet; the waste heat recovery main equipment unit 1 (8) and the waste heat recovery main equipment unit 2 (9) being provided with a fresh air duct, the fresh air duct of the waste heat recovery main equipment unit 2 (9) being the system fresh air inlet, and the fresh air duct outlet of the waste heat recovery main equipment unit 1 (8) being the system fresh air outlet; one side of the fresh air distribution system is connected to the system fresh air duct outlet, and the other side is connected to the setting machine (1) casing, and the fresh air after heat exchange and heat absorption is transported to different positions of the setting machine casing through the fresh air distribution system; The low-grade waste gas from both ends of the setting machine (1) is sent to the waste heat recovery main equipment unit 2 (9) through the waste gas distribution pipe for one heat exchange and then discharged. The high-grade waste gas with high calorific value from the middle section of the setting machine is successively sent to the waste heat recovery main equipment unit 1 (8) and the waste heat recovery main equipment unit 2 (9) for two heat exchanges and then discharged. Waste gases of different grades entering the waste heat recovery main equipment are subjected to waste heat recovery in different processes.

2. The waste heat classification recovery system for a setting machine according to claim 1 is characterized in that: The waste gas distribution pipe comprises a waste gas right pipe (2), a waste gas left pipe (3), a first waste gas exhaust pipe (4) at the cloth outlet, a second waste gas exhaust pipe (5) at the cloth outlet, a first front waste gas exhaust pipe (6), a second front waste gas exhaust pipe (7), a second box waste gas exhaust pipe (16) and a waste gas mixing pipe; The middle box of the shaping machine (1) is connected to the waste heat recovery main equipment unit 1 (8) through the right exhaust pipe (2) and the left exhaust pipe (3); the front end of the shaping machine (1) is connected to the exhaust mixing pipe through the front exhaust exhaust pipe 1 (6) and the front exhaust exhaust pipe 2 (7); the second box near the front end of the shaping machine (1) is connected to the exhaust mixing pipe through the second box exhaust exhaust pipe (16); the cloth outlet side of the rear end of the shaping machine (1) is connected to the exhaust mixing pipe through the cloth outlet exhaust exhaust pipe 1 (4) and the cloth outlet exhaust exhaust pipe 2 (5); The waste gas mixing pipe is connected to the waste gas inlet of the second waste heat recovery main equipment unit (9). The high-grade waste gas discharged from the middle box of the setting machine (1) is respectively sent to the first waste heat recovery main equipment unit (8) through the waste gas right pipe (2) and the waste gas left pipe (3) for the first heat exchange. The waste gas after the heat exchange in the first waste heat recovery main equipment unit (8) is discharged into the waste gas mixing pipe and sent to the second waste heat recovery main equipment unit (9) for heat exchange together with the low-grade waste gas transported from the two ends of the setting machine entering the waste gas mixing pipe. The waste gas after the heat exchange in the second waste heat recovery main equipment unit (9) is discharged from the waste gas exhaust port and enters the waste gas purification link.

3. The waste heat classification recovery system for a setting machine according to claim 2 is characterized in that: The waste heat recovery main equipment unit 1 (8) and the waste heat recovery main equipment unit 2 (9) are both composed of a plurality of single heat exchanger boxes, each of which includes an upper air duct (1-1), a lower air duct (1-2) and a fresh air duct (1-3); The upper air duct (1-1) and the lower air duct (1-2) of the monomer heat exchanger box are two box structures distributed up and down. The upper air duct (1-1) and the lower air duct (1-2) are connected by a wall panel to form a fresh air duct (1-3). A heat exchange component is arranged in the fresh air duct (1-3); the heat medium inlet and the heat medium outlet of the heat exchange component are respectively connected with the upper air duct (1-1) and the lower air duct (1-2), and the fresh air duct (1-3) is respectively provided with a fresh air inlet and a fresh air outlet in the horizontal direction; the fresh air ducts 1-3 of all the monomer heat exchanger boxes in the waste heat recovery main equipment unit 1 (8) and the waste heat recovery main equipment unit 2 (9) are connected to form the fresh air duct of the system; the fresh air duct 1-3 of the monomer heat exchanger box at the rear end of the waste heat recovery main equipment unit 2 (9) serves as the fresh air inlet of the system, and the fresh air duct 1-3 of the monomer heat exchanger box at the front end of the waste heat recovery main equipment unit 1 (8) serves as the fresh air outlet of the system.

4. The waste heat classification recovery system for a setting machine according to claim 3 is characterized in that: The lower air ducts (1-2) of all the individual heat exchanger boxes in the waste heat recovery main equipment unit 1 (8) and the waste heat recovery main equipment unit 2 (9) are connected to form an exhaust gas mixing pipe of the waste heat classification recovery system of the setting machine; the upper air ducts (1-1) of all the individual heat exchanger boxes in the waste heat recovery main equipment unit 1 (8) serve as the exhaust gas inlet of the waste heat recovery main equipment unit 1 (8), and high-grade exhaust gas is sent in from the upper air duct (1-1), and enters the exhaust gas mixing pipe after heat exchange with fresh air in each individual heat exchanger box of the waste heat recovery main equipment unit 1 (8); The downwind duct (1-2) of all the individual heat exchanger boxes in the waste heat recovery main equipment unit 2 (9) serves as the waste gas inlet of the waste heat recovery main equipment unit 2 (9). The low-grade waste gas from the waste gas mixing pipe enters the individual heat exchanger boxes of the waste heat recovery main equipment unit 2 (9) through the downwind duct (1-2) in the waste heat recovery main equipment unit 2 (9) and exchanges heat with fresh air before being discharged through the waste gas exhaust port provided in the waste heat recovery main equipment unit 2 (9).

5. The system for recovering residual heat from a setting machine according to claim 4 is characterized in that: The upper air ducts (1-1) of all the individual heat exchanger boxes in the waste heat recovery main equipment unit 1 (8) are connected to form a heat exchanger box group, and the upper air ducts (1-1) of several of the individual heat exchanger boxes in the heat exchanger box group serve as exhaust gas inlets; the upper air ducts (1-1) of all the individual heat exchanger boxes in the waste heat recovery main equipment unit 2 (9) are connected, and the upper air ducts (1-1) of several of the individual heat exchanger boxes serve as exhaust gas outlets of the system.

6. The waste heat classification recovery system for a setting machine according to any one of claims 1 to 5, characterized in that: The fresh air distribution system comprises a fresh air distribution box (13) connected to the outlet of the system fresh air duct and a plurality of air supply pipes connected to the fresh air distribution box (13), each of the air supply pipes being connected to a different box of the setting machine; a fresh air filter (12) is arranged at the inlet of the system fresh air duct.

7. The residual heat classification recovery system for a setting machine according to claim 6 is characterized in that: The heat exchange assembly is a plurality of heat exchange tubes (1-7) arranged vertically, and both ends of the heat exchange tubes are respectively connected to the upper air duct (1-1) and the lower air duct (1-2).

8. The system for recovering residual heat from a setting machine according to claim 7, characterized in that: The heat exchange tube (1-7) is a straight tube structure with a smooth inner wall.

9. The system for recovering residual heat from a setting machine according to claim 8, characterized in that: A heat exchange component flushing mechanism is arranged in the upper air duct (1-1) of the monomer heat exchanger box, the flushing mechanism comprising a horizontally arranged flushing pipe (1-4) and a plurality of horizontally arranged flushing branches connected to the flushing pipe (1-4), and a waste water pipe (1-5) is arranged in the lower air duct (1-2); the flushing branches are arranged above the plurality of heat exchange tubes (1-7), a nozzle is arranged at the bottom of each flushing branch, and each nozzle faces a heat exchange tube (1-7).

10. The residual heat classification recovery system of the setting machine according to claim 9 is characterized in that: The outer surface of the heat exchange tube (1-7) is provided with fins.

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