Waste heat recovery system of energy utilization equipment

Abstract

The utility model relates to a waste heat recovery system of energy using equipment, the energy using equipment comprises multiple sections of operation sections capable of generating waste gas with different temperatures, waste gas channels of the multiple sections of operation sections are communicated with one another, the waste heat recovery system comprises multiple waste heat recovery units and a gas collecting pipe, and the multiple sections of operation sections are connected into the waste heat recovery units through the gas collecting pipe. The interiors of the multiple waste heat recovery units communicate with one another to form a waste gas channel, and heat exchangers are arranged in the waste heat recovery units. According to the waste heat recovery device, waste gas of different grades is recovered in a segmented mode, and the energy grade of waste heat recovery can be improved.

Description

Technical Field

[0001] The present application relates to a waste heat recovery system for energy-consuming equipment. Background Art

[0002] Energy-consuming equipment often produces waste gas rich in heat, which needs to be recovered to save energy. For example, different temperature operating sections are set in equipment such as the setting machine used in the printing and dyeing industry and the brazing furnace used in the welding field. The waste gas and waste heat generated in different temperature sections have different qualities. If the waste gas generated in each temperature section is mixed and then the waste heat is recovered, it will obviously cause the waste gas of different qualities to be mixed together, and high-quality waste heat cannot be recovered. Therefore, waste heat recovery is required according to different situations. The following takes the setting machine scenario as an example to illustrate.

[0003] The setting machine is a device used to dry and set fabrics. After setting, the fabric will have a good feel and stable size. After the fabric enters the heating zone, the time required to heat the fabric surface to the setting temperature is called the heating time. After the fabric surface reaches the setting temperature, the time required for the fibers in all parts of the fabric to have the same setting temperature is called the heat penetration time. After the fabric reaches the setting temperature, the time required for the molecules in the fiber to adjust according to the setting conditions is called the molecular adjustment time. The time required for the fabric to cool down after the size of the fabric is fixed after it leaves the drying room is called the cooling time. The setting time usually refers to the time required for the first three items, excluding the fourth item. The time required for heating and heat penetration depends on the performance of the heat source, the weight per unit area of ​​the fabric, the thermal conductivity of the fiber, and the moisture content of the fabric. It can be seen that the working conditions of each section of the setting machine are different according to the fabric, which causes the temperature and quality of the exhaust gas discharged by the setting machine to be different. At the same time, since the first few sections of the setting machine are mainly used to dry the water in the fabric, the exhaust gas obtained by the first few sections of the setting machine has a higher humidity and a lower quality; while the exhaust gas humidity of the last few sections of the setting machine decreases due to the dry fabric, and the quality is higher. At present, the waste heat recovery of the setting machine generally recycles the waste gas from all the ovens of the setting machine after mixing and discharging them. This will cause the waste gas of different qualities to mix together, and it is impossible to recover high-quality waste heat. Utility Model Content

[0004] The purpose of this application is to design a waste heat recovery system for energy-consuming equipment, which can improve the energy quality of waste heat recovery by recovering waste gases of different qualities discharged from different temperature sections in sections.

[0005] The present application relates to a waste heat recovery system for energy-consuming equipment, wherein the energy-consuming equipment comprises a plurality of working sections capable of generating waste gases of different temperatures, the waste gas passages of the plurality of working sections being interconnected, the waste heat recovery system comprising a plurality of waste heat recovery units and a gas collecting pipe, the plurality of working sections being connected to the interior of the waste heat recovery unit via the gas collecting pipe, the interiors of the plurality of waste heat recovery units being also interconnected to form a waste gas passage, and a heat exchanger being arranged inside each of the waste heat recovery units.

[0006] Among them, the heat exchanger inside the waste heat recovery unit can be connected to the waste heat conversion unit; a secondary heat exchanger can be provided inside the waste heat conversion unit, and the heat exchanger inside the waste heat recovery unit and the secondary heat exchanger can be connected through a circulating pump to form a circulation pipeline of the heat exchange medium; a liquid storage tank can also be connected to the circulation pipeline; the internal exhaust gas channel of the waste heat recovery unit can be connected in sequence and finally connected to the exhaust gas purification device, and the internal exhaust gas channel of each of the waste heat recovery units is also connected to the exhaust gas purification device respectively; a spray device can be provided inside the waste heat recovery unit; the energy-consuming equipment can be a shaping machine or a brazing furnace; a heat exchanger can also be provided in the operating section of the energy-consuming equipment, and the circulation pipeline of the heat exchange medium can be connected to the heat exchanger in the operating section; each operating section can be provided with the gas collecting pipe or at least two operating sections can be connected to one gas collecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A schematic diagram showing the waste heat recovery system of the present application.

[0008] Figure 2 A schematic diagram showing the internal structure of the waste heat recovery unit. DETAILED DESCRIPTION

[0009] In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in detail in conjunction with the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict. The embodiments of the present application are only described by taking the setting machine as an example. Those skilled in the art can understand that the waste heat recovery system of the present application can also be used in other scenarios with different temperature ranges without being limited by the embodiments.

[0010] Figure 1A waste heat recovery system for an energy-consuming equipment according to the present application is shown, and the energy-consuming equipment is a shaping machine, including multiple waste heat recovery units 1 and an air collecting pipe 2. The shaping machine includes a multi-section oven 7, and the multi-section ovens 7 are connected in sequence. The multi-section ovens in the shaping machine are multi-section operating sections that can generate waste gases at different temperatures. The multi-section ovens 7 are connected to the interior of the waste heat recovery unit 1 through the air collecting pipe 2 to discharge the waste gas generated during the operation of the shaping machine to the interior of the waste heat recovery unit 1. A heat exchanger 11 is provided inside the waste heat recovery unit 1, and the heat exchanger 11 transfers the heat carried in the internal heat exchange medium through the circulation pipeline of the heat exchange medium. As shown Figure 1 As shown, according to the temperature and quality of the waste gas collected by the collecting pipe 2, multiple waste heat recovery units 1 are connected in sequence, so that the heat exchange medium in the heat exchanger 11 is sequentially heat-exchanged in multiple waste heat recovery units 1, and not only the heat is increased, but also the temperature and quality of the heat exchange medium are continuously improved, thereby laying a foundation for further waste heat classification and conversion. The connection mode of multiple waste heat recovery units can be series connection, parallel connection or a combination thereof.

[0011] Specifically, according to the temperature grade of the exhaust gas discharged from each oven 7 of the setting machine, the exhaust gas with similar temperature grade in one or several ovens is collected through the gas collecting pipe 2, and enters the respective waste heat recovery units 1 according to the temperature grade of the collected exhaust gas, and the exhaust gas exchanges heat with the heat exchanger 11 in each waste heat recovery unit 1, and transfers heat energy to the heat exchange medium in the heat exchanger 11. After the heat exchange, the exhaust gas temperature grade decreases. If it can still be used in the next or next-level waste heat recovery unit 1 with a lower temperature grade, it enters the next or next-level waste heat recovery unit 1 with a lower temperature grade to recover the waste heat again, otherwise it is directly discharged.

[0012] Preferably, the exhausted waste gas can be transferred to the waste gas cleaning device 6 for waste gas treatment before being discharged into the natural environment. Figure 1As shown, there are multiple waste heat recovery units 1, and each waste heat recovery unit is interconnected from left to right, and can also be connected to the exhaust gas purification device 6. It should be noted that the above-mentioned exhaust gas channels are all provided with control components, which can control the opening and closing of each channel separately according to the quality of the waste heat in the waste heat recovery unit. The heat exchanger 11 in the waste heat recovery unit 1 is connected in sequence through the heat exchange pipeline, and the waste heat conversion unit 3, the circulation pump 4 and the liquid storage tank 5 can also be arranged on the circulation pipeline of the heat exchange medium. The waste heat conversion unit 3 is provided with a secondary heat exchanger, which can exchange heat with air, water, etc. through natural convection or forced convection to produce energy materials such as hot air or hot water of different qualities. After the heat exchange medium flows out of the multiple waste heat recovery units 1, it flows into the multiple waste heat conversion units 3 in sequence. After passing through the multiple waste heat conversion units, the temperature of the heat exchange medium drops, and it further flows into the liquid storage tank 5, and driven by the circulation pump 4, the heat exchange medium flows into the multiple waste heat recovery units 1 again, and the cycle is repeated for cyclic heat exchange.

[0013] According to the demand of the oven 7 of the setting machine for energy materials of different qualities, the waste heat recovered from the exhaust gas can be fed back to the setting machine, thereby reducing the energy consumption of the setting machine. For example, a heat exchanger can be set in the front oven of the setting machine to directly transport the heat exchange medium with a higher temperature quality to the heat exchanger in the oven, and directly heat the air entering the setting machine through the heat exchanger to replenish the energy required for fabric setting. Furthermore, if the quality of the heat exchange medium cannot meet the process requirements in the setting machine, the temperature of the heat exchange medium can be increased by other heating means to meet the requirements for heat exchange in the setting machine.

[0014] Since the waste gas of the setting machine contains a variety of chemical additives and fibers, the heat exchanger 11 in the waste heat recovery unit 1 is prone to scaling, resulting in a decrease in heat exchange efficiency. A spray device 12 can be provided in the waste heat recovery unit 1 to spray and clean the heat exchanger regularly or irregularly, thereby reducing scaling and preventing the heat exchange efficiency of the heat exchanger from decreasing. At the same time, a dirt receiving pan 13 can be provided in the waste heat recovery unit 1 to receive the chemical additives, fiber materials condensed in the waste gas in the waste heat recovery unit 1 and the dirt washed by spraying.

[0015] Although the implementation methods disclosed in this application are as above, the contents described are only implementation methods adopted for facilitating the understanding of this application, and are not intended to limit this application. Any technician in the technical field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be based on the scope defined in the attached claims.

Claims

1. A waste heat recovery system for an energy-consuming device, wherein the energy-consuming device comprises multiple working sections capable of generating waste gas at different temperatures, and the waste gas passages of the multiple working sections are interconnected, characterized in that: The waste heat recovery system includes multiple waste heat recovery units and a gas collecting pipe. Multiple working sections are connected to the interior of the waste heat recovery unit through the gas collecting pipe. The interiors of the multiple waste heat recovery units are also interconnected to form a waste gas channel. A heat exchanger is provided inside each of the waste heat recovery units.

2. The waste heat recovery system according to claim 1, characterized in that: The heat exchanger inside the waste heat recovery unit is connected to the waste heat conversion unit.

3. The waste heat recovery system according to claim 2, characterized in that: A secondary heat exchanger is provided inside the waste heat conversion unit, and the heat exchanger inside the waste heat recovery unit is connected to the secondary heat exchanger through a circulation pump to form a circulation pipeline for the heat exchange medium.

4. The waste heat recovery system according to claim 3, characterized in that: The circulation pipeline is also connected with a liquid storage tank.

5. The waste heat recovery system according to any one of claims 1 to 3, characterized in that: The internal exhaust gas passages of the waste heat recovery unit are sequentially connected and finally connected to the exhaust gas purification device.

6. The waste heat recovery system according to claim 5, characterized in that: The internal exhaust gas passage of each of the waste heat recovery units is also connected to the exhaust gas purification device respectively.

7. The waste heat recovery system according to any one of claims 1 to 3 and 6, characterized in that: A spray device is provided inside the waste heat recovery unit.

8. The waste heat recovery system according to any one of claims 1 to 3 and 6, characterized in that: The energy-consuming equipment is a shaping machine or a brazing furnace.

9. The waste heat recovery system according to claim 3 or 4, characterized in that: A heat exchanger is also provided in the operating section of the energy-consuming equipment, and the circulation pipeline of the heat exchange medium is connected to the heat exchanger in the operating section.

10. The waste heat recovery system according to any one of claims 1 to 3 and 6, characterized in that: Each working section is provided with the gas collecting pipe or at least two working sections are connected to one gas collecting pipe.

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