Waste gas treatment system of energy utilization equipment

Abstract

The utility model relates to a waste gas treatment system of energy consumption equipment, which comprises the energy consumption equipment, a waste gas treatment unit and an air supplement unit, the waste gas treatment unit and the air supplement unit are respectively communicated with the energy consumption equipment through channels, a first heat exchanger is arranged in the energy consumption equipment, a second heat exchanger is arranged in the waste gas treatment unit, and the air supplement unit is communicated with the first heat exchanger. A third heat exchanger is arranged in the air supplementing unit, and the first heat exchanger communicates with the second heat exchanger and the third heat exchanger. Waste heat recovery is conducted on waste gas generated by the energy consumption equipment, purification treatment is conducted again to achieve waste gas harmlessness, meanwhile, the recovered waste heat is converted and fed back to the energy consumption equipment, and energy material consumption of the energy consumption equipment is reduced.

Description

Technical Field

[0001] This application relates to an exhaust gas treatment system for energy-consuming equipment, which is applicable to the technical field of exhaust gas treatment. Background Art

[0002] During the industrial production process, in order to meet the needs of the production process, it is usually necessary to consume energy substances, which may be coal, fuel oil, gas, or medium-pressure steam, etc. During the consumption of energy substances and the processing process, a large amount of waste gas or waste liquid will be generated, which not only contains various substances harmful to the environment and human health, but also contains a large amount of energy. Therefore, when treating these waste gases or waste liquids to make them harmless to the environment, it is even more necessary to recycle the energy contained therein, thereby reducing the consumption of energy substances. Utility Model Content

[0003] The purpose of this application is to design an exhaust gas treatment system for energy-consuming equipment, which can recover the waste heat in the exhaust gas, thereby condensing the pollutants in the exhaust gas, and at the same time, the recovered heat can be returned to the energy-consuming equipment for continued use, achieving the effect of heat recovery and utilization and exhaust gas purification.

[0004] This application relates to an exhaust gas treatment system for energy-consuming equipment, including an energy-consuming equipment, an exhaust gas treatment unit, and a make-up air unit. The exhaust gas treatment unit and the make-up air unit are respectively connected to the energy-consuming equipment through channels. A first heat exchanger is provided in the energy-consuming equipment, a second heat exchanger is provided in the exhaust gas treatment unit, and a third heat exchanger is provided in the make-up air unit. The first heat exchanger is respectively connected to the second heat exchanger and the third heat exchanger.

[0005] Wherein, an exhaust gas collection unit can be provided between the energy-consuming equipment and the exhaust gas treatment unit; the exhaust gas treatment unit can include a waste heat recovery unit and an exhaust gas purification unit, and the waste heat recovery unit can be arranged upstream of the exhaust gas purification unit; the exhaust gas treatment unit and the make-up air unit can be connected by a duct; a cooling unit can also be included. A pipeline for a heat exchange medium is provided in the cooling unit. The cooling unit can use spraying or heat exchange equipment to cool the heat exchange medium in the pipeline, and the cooled heat exchange medium enters the second heat exchanger in the exhaust gas treatment unit; a circulation device can also be provided on the pipeline of the heat exchange medium; the exhaust gas treatment system can include at least two exhaust gas treatment units connected in parallel or in series; the energy-consuming equipment can also be connected to an air inlet for sucking in external air, and a suction fan can be provided at the air inlet or in the energy-consuming equipment.

[0006] This application recovers the waste heat generated by the energy-consuming equipment, and conducts secondary purification treatment to achieve the harmlessness of the exhaust gas. At the same time, the recovered waste heat is converted and replenished to the energy-consuming equipment, reducing the consumption of energy substances by the energy-consuming equipment. Brief Description of the Drawings

[0007] Figure 1 FIG. 5 is a schematic diagram of a first embodiment of the exhaust gas treatment system of the energy-consuming device of the present application.

[0008] Figure 2 FIG. 6 is a schematic diagram of a second embodiment of the exhaust gas treatment system of the energy-consuming device of the present application.

[0009] Figure 3 FIG. 7 is a schematic diagram of a third embodiment of the exhaust gas treatment system of the energy-consuming device of the present application.

[0010] Figure 4 FIG. 8 is a schematic diagram of a fourth embodiment of the exhaust gas treatment system of the energy-consuming device of the present application.

[0011] Figure 5 FIG. 9 is a schematic diagram of a fifth embodiment of the exhaust gas treatment system of the energy-consuming device of the present application.

[0012] Figure 6 FIG. 10 is a schematic diagram of a sixth embodiment of the exhaust gas treatment system of the energy-consuming device of the present application. Detailed Description of the Embodiments

[0013] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other arbitrarily.

[0014] As shown in Figure 1 , according to an exhaust gas treatment system of an energy-consuming device of the present application, it includes an energy-consuming device 1, an exhaust gas treatment unit 3 and a makeup air unit 5. The exhaust gas treatment unit 3 and the makeup air unit 5 are respectively connected to the energy-consuming device 1 through channels. A first heat exchanger 11 is provided in the energy-consuming device 1, a second heat exchanger 12 is provided in the exhaust gas treatment unit 3, and a third heat exchanger 13 is provided in the makeup air unit 5. The first heat exchanger 11 is respectively connected to the second heat exchanger 12 and the third heat exchanger 13.

[0015] The exhaust gas treatment unit 3 is configured to cool the exhaust gas generated by the energy-consuming device 1 and recover the waste heat. By reducing the temperature of the exhaust gas, harmful substances contained in the exhaust gas can be condensed, thereby achieving the effect of purifying the exhaust gas. Among them, an exhaust gas collection unit 2 can also be provided between the energy-consuming device 1 and the exhaust gas treatment unit 3. The exhaust gas collection unit 2 can be a separate unit component or in the form of an exhaust gas pipeline, and is used to collect and transport the exhaust gas generated by the energy-consuming device 1. The exhaust gas treatment system can also include a circulation device 6 for circulating the heat exchange medium. A cooling unit 7 can also be provided to pre-cool the heat exchange medium entering the second heat exchanger, so that the exhaust gas treatment unit 3 can condense and recover more exhaust gas. The first heat exchanger 11 of the present application can be provided at the inlet of the energy-consuming device 1 to pre-heat the mixed air entering the energy-consuming device.

[0016] The exhaust gas of the energy-consuming device 1 is collected by the exhaust gas collection unit 2 and then enters the exhaust gas treatment unit 3. The exhaust gas treatment unit 3 can further include a waste heat recovery unit 31 and an exhaust gas purification unit 32. Relative to the exhaust gas transmission path, the waste heat recovery unit 31 is provided upstream of the exhaust gas purification unit 32. The heat exchange medium exchanges heat with the exhaust gas through the second heat exchanger 12, and the exhaust gas realizes waste heat recovery and purification. The heat exchange medium that obtains the waste heat further exchanges heat with the gas in the energy-consuming device through the first heat exchanger 11 in the energy-consuming device, pre-heats the gas entering the energy-consuming device, and at the same time the temperature of the heat exchange medium further decreases. The heat exchange medium with reduced temperature further flows into the air supply supplement unit 5 and exchanges heat with the outside air through the third heat exchanger 13. The outside air obtains the waste heat and is heated up and enters the energy-consuming device 1 as fresh air. At this time, the waste heat of the heat exchange medium has been fully utilized and the temperature has decreased. The heat exchange medium enters the circulation device 6 for circulation. Preferably, before the heat exchange medium circulates into the exhaust gas treatment unit 3, it can first pass through the cooling unit 7 for cooling, so that more harmful substances can be condensed and recovered in the exhaust gas treatment unit 3, so as to fully condense and purify the exhaust gas. After being condensed and purified by the exhaust gas treatment unit 3, the exhaust gas has been treated very cleanly, and the contents of solid particles, oil fume, VOC, etc. are far less than the requirements of exhaust gas emissions.

[0017] As Figure 2 shown, a duct 8 can be connected between the exhaust gas treatment unit 3 and the air supply supplement unit 5, and the exhaust gas discharged from the energy-consuming device 1 is processed and then replenished into the energy-consuming device again through the air supply supplement unit 5. At the same time, considering the requirements for gas during the processing of raw materials and semi-finished products in the energy-consuming device 1, a re-cleaning treatment device such as spraying can be provided in the duct 8 to meet the requirements for gas cleanliness during the processing process. The medium that exchanges heat with the heat exchange medium in the cooling unit 7 can be the cooling water from the cooling water tower 71, as Figure 3 shown. It can also be the refrigerant throttled and expanded by the refrigeration unit 72, asFigure 4 as shown

[0018] According to the energy grade of the waste gas discharged by the energy-consuming device 1, the waste gas collection unit 2 can be set at different places of the energy-consuming device to collect the waste gas, and the waste gas treatment unit 3 can be set corresponding to the energy grade of the collected waste gas. As Figure 5 shown, it shows a link for realizing waste heat recovery, purification treatment, waste heat conversion and inhalation treatment of waste gas through two heat exchange medium circulation systems. As Figure 6 shown, it shows that two waste gas collection units 2 and two waste gas treatment units 3 can be connected in parallel. The above embodiments can illustrate that in the technical solution of the claims of the present application, some units can be connected in series or in parallel according to actual needs.

[0019] In Figure 1 the shown embodiment, taking the waste gas discharged from the energy-consuming device at 165°C as an example, the following specific embodiments are given:

[0020] 1. Flow condition of waste gas

[0021] (1) The energy-consuming device 1 discharges waste gas at 165°C, which becomes 160°C after being collected by the collection unit 2;

[0022] (2) The 160°C waste gas enters the waste heat recovery and waste gas purification unit 3. After passing through the waste heat recovery unit 31, the waste gas temperature drops to 70°C, and after entering the waste gas purification unit 32, the waste gas temperature drops to 5 - 8°C different from the ambient air temperature. That is, if the ambient air temperature is 32°C at this time, then the waste gas temperature is 37 - 40°C;

[0023] 2. Flow condition of heat exchange medium

[0024] (1) The heat exchange medium at 40 - 43°C exchanges heat with the waste gas in the waste gas purification unit 32 and its temperature rises to 65°C; and further flows into the waste heat recovery unit 31 to exchange heat with the waste gas and its temperature rises to 155°C;

[0025] (2) The 155°C heat exchange medium flows into the first heat exchanger 11 in the energy-consuming device and exchanges heat with the gas in the energy-consuming device 1. The temperature of the gas in the energy-consuming device 1 rises and the temperature of the heat exchange medium drops to 120°C;

[0026] (3) The 120°C heat exchange medium flows into the air supply supplement unit 5 to exchange heat with the ambient air. Since the heat energy carried away by the air volume supplemented by the air supply supplement unit 5 to the stenter is not enough to cool the heat exchange medium to the ambient air temperature, the heat exchange medium flows back to the circulation device 6 at about 70°C and is further output by the pump.

[0027] (4) The heat exchange medium at 70 °C is output by a pump and undergoes heat exchange in the cooling unit 7. The temperature of the heat exchange medium drops to 40 - 43 °C and flows into the waste gas purification unit 32, thus completing the entire heat exchange cycle of the heat exchange medium.

[0028] 3. Air supply flow condition

[0029] Ambient air is inhaled by the air supply unit 5, undergoes heat exchange with the heat exchange medium through the third heat exchanger 13, the temperature rises to 110 - 115 °C, and enters the energy-consuming device 1 to be mixed with the ambient air inhaled from other ports of the energy-consuming device 1; the mixed gas is further inhaled by the suction fan built in the energy-consuming device 1 and undergoes heat exchange with the heat exchange medium through the heat exchanger, so that the air in the energy-consuming device 1 obtains heat energy and the temperature rises.

[0030] Although the embodiments disclosed in this application are as above, the content described is only the embodiments adopted for the convenience of understanding this application and is not used to limit this application. Any person skilled in the art within the technical field to which this application pertains, without departing from the spirit and scope disclosed in this application, can make any modifications and changes in the form of implementation and details, but the scope of patent protection of this application shall still be subject to the scope defined by the appended claims.

Claims

1. An exhaust gas treatment system for an energy-consuming device, comprising an energy-consuming device, an exhaust gas treatment unit and a makeup air unit, wherein the exhaust gas treatment unit and the makeup air unit are respectively communicated with the energy-consuming device through channels, and is characterized in that, A first heat exchanger is provided inside the energy-consuming device, a second heat exchanger is provided in the waste gas treatment unit, and a third heat exchanger is provided in the make-up air unit. The first heat exchanger is communicated with the second heat exchanger and the third heat exchanger respectively.

2. The exhaust gas treatment system according to claim 1, characterized in that, A waste gas collection unit is arranged between the energy-consuming device and the waste gas treatment unit.

3. The exhaust gas treatment system according to claim 1 or 2, characterized in that, The waste gas treatment unit includes a waste heat recovery unit and a waste gas purification unit, and the waste heat recovery unit is arranged upstream of the waste gas purification unit.

4. The exhaust gas treatment system according to claim 1 or 2, characterized in that, The waste gas treatment unit and the make-up air unit are connected by a duct.

5. The exhaust gas treatment system according to claim 1 or 2, characterized in that, It further includes a cooling unit. A pipeline of a heat exchange medium is provided inside the cooling unit. The cooling unit cools the heat exchange medium in the pipeline by spraying or using a heat exchange device, and the cooled heat exchange medium enters the second heat exchanger of the waste gas treatment unit.

6. The exhaust gas treatment system according to claim 5, characterized in that, A circulation device is further provided on the pipeline of the heat exchange medium.

7. The exhaust gas treatment system according to claim 1 or 2 or 6, characterized in that, The waste gas treatment system includes at least two waste gas treatment units connected in parallel or in series.

8. The exhaust gas treatment system according to claim 1 or 2 or 6, characterized in that The energy-consuming device is further connected with an air inlet for sucking in outside air, and a suction fan is provided at the air inlet or inside the energy-consuming device.

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