VCU system capable of utilizing waste heat

By setting up a heat exchanger in the combustion cylinder of the VCU system, the resource waste caused by direct discharge of high-temperature flue gas is solved, and the conditions for manual sampling and the recycling of heat energy are realized.

CN222437952UActive Publication Date: 2025-02-07NANJING DOULE REFRIGERATION EQUIP
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Patent Information

Application Number
CN202420164294.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-01-23
Publication Date
2025-02-07
Estimated Expiration
2034-01-23

AI Technical Summary

Technical Problem

The existing VCU system cannot perform manual sampling when high-temperature flue gas is discharged directly, and the heat cannot be recycled, resulting in waste of resources.

Method used

A VCU system for utilizing waste heat is designed. By setting a heat exchanger in the combustion cylinder, high-temperature flue gas is exchanged, the temperature is reduced, and the heat energy recovery is carried out using a combustion fan and a heat exchanger.

Benefits of technology

The artificial online sampling conditions are met, and at the same time, through the recycling of heat energy, resource waste is reduced and waste heat is provided.

✦ Generated by Eureka AI based on patent content.

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    Figure CN222437952U_ABST
Patent Text Reader

Abstract

The utility model discloses a waste heat utilization VCU system which comprises a VCU equipment combustion cylinder, a gas inlet pipeline unit, a natural gas pipeline unit, a combustion-supporting pipeline unit and a waste heat recovery pipeline unit, heat exchanger equipment is arranged in the combustion cylinder, heat exchange is conducted on high-temperature flue gas, the temperature of high-temperature flue gas emission is reduced, and the waste heat recovery efficiency is improved. In addition, a branch pipe is led out from a combustion fan pipeline to serve as cold side inlet air of a heat exchanger to exchange heat with high-temperature flue gas, and the condition of manual online sampling detection is met; after waste gas heat exchange, heat energy is recycled, high-temperature gas obtained after heat exchange can be used for producing hot water or instruments and equipment for heat tracing and other waste heat utilization, and environmental protection and energy saving are achieved.
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Description

Technical Field

[0001] The utility model relates to the field of VCU systems, in particular to a VCU system for waste heat utilization. Background Art

[0002] The Chinese name of VCU (Vapor Combustion Unit) is oil and gas efficient direct combustion device. VCU equipment is an environmental management equipment that introduces the generated VOC gas into the combustion tube and completely burns it at 800-1000℃, then decomposes it into harmless, odorless clean gas and discharges it into the atmosphere.

[0003] The existing VCU equipment is an environmental management device that introduces the generated VOC gas into the combustion chimney and completely burns it at 800-1000℃, then decomposes it into harmless, odorless clean gas and discharges it into the atmosphere. The oil and gas are directly discharged after high-temperature combustion, and the temperature is as high as 800℃ or above, making it impossible to perform manual sampling. In addition, the high-temperature flue gas is directly discharged, and the heat is not recycled, resulting in a large waste. The existing VCU system design is as follows: Figure 1 shown. Utility Model Content

[0004] Purpose of the utility model: In order to solve the problems of the prior art, the utility model provides a VCU system for waste heat utilization. The high-temperature flue gas is discharged through heat exchange, and the temperature is effectively reduced to meet the conditions for manual online sampling, and the heat energy of the exhaust gas is recovered after heat exchange.

[0005] Technical solution: The VCU system for waste heat utilization described in the utility model includes a VCU equipment combustion cylinder, an air intake pipeline unit, a natural gas pipeline unit, a combustion-supporting pipeline unit and a waste heat recovery pipeline unit;

[0006] The combustion tube of the VCU device is erected on the horizontal ground and the top is connected to the atmosphere; a burner is provided at the bottom of the combustion tube of the VCU device, and also includes an ignition rod, which passes through the side wall of the combustion tube of the VCU device from the outside and extends to the top of the burner;

[0007] The air intake pipeline unit includes an exhaust gas inlet main pipeline, a liquid separation tank, a system fan inlet main pipeline, a system fan and a system fan outlet main pipeline which are arranged in sequence; the system fan outlet main pipeline is connected to the burner at the bottom of the combustion cylinder of the VCU equipment;

[0008] The natural gas pipeline unit includes a natural gas intake main pipe, the rear end of which is divided into two pipes: a burner main fire pipe and a burner ignition pipe. The burner main fire pipe is connected to the system fan outlet main pipe, and the burner ignition pipe is connected to the ignition rod to provide natural gas supply;

[0009] The combustion-supporting pipeline unit includes a combustion-supporting fan connected between the fresh air and the burner at the bottom of the combustion tube of the VCU equipment;

[0010] The waste heat recovery unit includes a heat exchanger built into the combustion tube of the VCU equipment, a heat exchanger inlet pipeline and a heat exchanger outlet pipeline; the combustion-supporting fan is connected to the heat exchanger through the heat exchanger inlet pipeline; the heat exchanger outlet pipeline connects the heat exchanger to the waste heat treatment recovery terminal equipment.

[0011] Furthermore, a rectangular damper is provided on the periphery of the bottom burner in the combustion tube of the VCU device; the ignition rod passes through the side wall of the combustion tube of the VCU device through the flange interface from the outside and extends to the top of the burner; the flange interface is a hollow structure and is fixedly connected to the side wall of the combustion tube of the VCU device.

[0012] Furthermore, the combustion tube of the VCU equipment is erected on the ground by connecting with the pre-buried anchor bolt flange and is directly connected with the atmosphere.

[0013] Furthermore, a system fan inlet flame arrester and a system fan outlet flame arrester are respectively provided at the inlet and outlet of the system fan, and both are connected through pipelines in the form of flanges.

[0014] Furthermore, the liquid separation tank, the system fan and the burner are connected to each other through pipelines using flange connections.

[0015] Furthermore, the natural gas intake main pipe is connected to the burner main fire pipeline and the burner ignition pipeline by a three-way flange; the burner main fire pipeline is connected to the system fan outlet main pipeline by a flange, and the burner ignition pipeline is connected to the ignition rod by a threaded connection.

[0016] Furthermore, the combustion-supporting pipeline unit also includes a combustion-supporting fan outlet main pipeline, a combustion-supporting fan main fire pipeline, and a combustion-supporting fan ignition pipeline. The combustion-supporting fan is connected to the burner via the combustion-supporting fan main fire pipeline, and the combustion-supporting fan is connected to the ignition rod via the combustion-supporting fan ignition pipeline; the combustion-supporting fan outlet main pipeline, the combustion-supporting fan main fire pipeline, and the combustion-supporting fan ignition pipeline are connected by flanges.

[0017] Furthermore, a first regulating valve is provided on the combustion-supporting fan main fire pipeline between the combustion-supporting fan and the burner. Fresh air passes through the combustion-supporting fan, and the air volume is adjusted by the first regulating valve to control the combustion temperature and the stability of the flame.

[0018] Furthermore, a second regulating valve is provided on the heat exchanger inlet pipeline between the combustion-supporting fan and the heat exchanger. The second regulating valve controls the air volume along the heat exchanger inlet pipeline to exchange heat with the high-temperature clean flue gas discharged from the bottom of the combustion tube in the heat exchanger, thereby recycling the heat energy.

[0019] Furthermore, the combustion tube of the VCU equipment is also provided with a detection port. After the high-temperature clean flue gas is discharged at a lower temperature, the discharged flue gas can be safely sampled and tested manually through the detection port.

[0020] Beneficial effects: Compared with the prior art, the utility model has the following advantages: (1) a heat exchanger device is built into the combustion tube to exchange heat with high-temperature flue gas and reduce the temperature of high-temperature flue gas emissions. In addition, a branch pipe is led out from the combustion-supporting fan pipeline as the cold-side air inlet of the heat exchanger to exchange heat with the high-temperature flue gas, thereby meeting the conditions for manual online sampling and detection; (2) after the exhaust gas heat exchange, the heat energy is recovered and utilized, and the high-temperature gas after heat exchange can be used to produce hot water or use waste heat such as heating for instruments and equipment, which is environmentally friendly and energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the VCU system before transformation in the background technology;

[0022] Figure 2 This is a schematic structural diagram of a VCU system for waste heat utilization according to Example 1 of the utility model. DETAILED DESCRIPTION

[0023] Embodiment 1:

[0024] like Figure 2 As shown, the utility model discloses a VCU system for waste heat utilization, including a VCU equipment combustion cylinder 23, an air intake pipeline unit, a natural gas pipeline unit, a combustion-supporting pipeline unit, and a waste heat recovery pipeline unit;

[0025] The VCU equipment combustion tube 23 is erected on the ground by connecting with the pre-buried anchor bolt flange, and the top is directly connected to the atmosphere; the bottom of the VCU equipment combustion tube 23 is provided with a burner 15, and the periphery of the burner 15 is also provided with a rectangular damper 20; it also includes an ignition rod 16, which passes through the side wall of the VCU equipment combustion tube 23 from the outside through the flange interface and extends to the top of the burner 15; the flange interface (not shown) is a hollow structure and is fixedly connected to the side wall 23 of the VCU equipment combustion tube. The burner 15 and the rectangular damper 20 are flange-connected to the VCU equipment combustion tube 23.

[0026] The air intake pipeline unit includes an exhaust gas inlet main line 1, a liquid separation tank 12, a system fan inlet main line 2, a system fan 18, and a system fan outlet main line 3 arranged in sequence; the system fan outlet main line 3 is connected to the burner 15; the inlet and outlet of the system fan 18 are respectively provided with a system fan inlet flame arrester 13 and a system fan outlet flame arrester 14, which are connected through pipelines by flanges. The liquid separation tank 12, the system fan 18, and the burner 15 are connected through pipelines by flange connection.

[0027] The natural gas pipeline unit includes a natural gas intake main pipe 9, the rear end of which is branched into a burner main fire pipeline 11 and a burner ignition pipeline 10. The burner main fire pipeline 11 is connected to the system fan outlet main pipeline 3, and the burner ignition pipeline 10 is connected to the ignition rod 16 to provide natural gas supply; the natural gas intake main pipe 9 and the burner main fire pipeline 11 and the burner ignition pipeline 10 are connected by a three-way flange; the burner main fire pipeline 11 is connected to the system fan outlet main pipeline 3 by a flange, and the burner ignition pipeline 10 is connected to the ignition rod 16 by a threaded connection.

[0028] The combustion-supporting pipeline unit includes a combustion-supporting fan 19 connected between the fresh air and the burner 15 at the bottom of the combustion tube 23 of the VCU equipment; includes a combustion-supporting fan outlet main pipeline 4, a combustion-supporting fan main fire pipeline 5, and a combustion-supporting fan ignition pipeline 6. The combustion-supporting fan 19 is connected to the burner 15 through the combustion-supporting fan main fire pipeline 5, and the combustion-supporting fan 19 is connected to the ignition rod 16 through the combustion-supporting fan ignition pipeline 6; the combustion-supporting fan outlet main pipeline 4, the combustion-supporting fan main fire pipeline 5, and the combustion-supporting fan ignition pipeline 6 are connected by flanges.

[0029] The waste heat recovery unit includes a heat exchanger 17 built into the combustion tube 23 of the VCU equipment, a heat exchanger inlet pipeline 7 and a heat exchanger outlet pipeline 8; the combustion-supporting fan 19 is connected to the heat exchanger 17 through the heat exchanger inlet pipeline 7; the heat exchanger outlet pipeline 8 connects the heat exchanger 17 to the waste heat treatment recovery terminal equipment.

[0030] A first regulating valve 24 is provided on the combustion-supporting machine main fire pipeline 5 between the combustion-supporting fan 19 and the burner 15. Fresh air passes through the combustion-supporting fan 19, and the air volume is adjusted by the first regulating valve 24 to control the combustion temperature and the stability of the flame.

[0031] A second regulating valve 21 is provided on the heat exchanger inlet pipeline 7 between the combustion-supporting fan 19 and the heat exchanger 17. The second regulating valve 21 controls the air volume along the heat exchanger inlet pipeline 7 and the high-temperature clean flue gas discharged from the bottom of the VCU equipment combustion tube 23 to exchange heat in the heat exchanger 17, and the heat energy is recovered and utilized.

[0032] The VCU equipment combustion tube 23 is also provided with a detection port 22. The high-temperature clean flue gas is discharged after the temperature is reduced, and the discharged flue gas can be safely sampled and tested manually through the detection port.

[0033] The system operation process of the utility model is as follows:

[0034] Starting phase: natural gas passes through the main pipe 9 and then through the ignition pipe 10 into the ignition rod 16, fresh air is pressurized by the combustion-supporting fan 19, passes through the combustion-supporting fan outlet main pipe 4 and then through the combustion-supporting fan ignition pipe 6 into the ignition rod 16, at which time the ignition rod 16 ignites to form a small flame.

[0035] Operation phase: the exhaust gas enters the burner 15 through the exhaust gas inlet main line 1, the liquid separation tank 12, the system fan inlet main line 2, the system fan inlet flame arrester 13, the system fan 18, the system fan outlet flame arrester 14, and the system fan outlet main line 3. Fresh air is pressurized by the combustion-supporting fan 19 and enters the burner through the burner outlet main line 4 and the combustion-supporting fan main fire line 5. The exhaust gas is mixed with the fresh air and ignited by the flame formed by the ignition rod 16. The exhaust gas burns violently to form a large flame. At the same time, the VOCs components in the exhaust gas are processed into clean flue gas and discharged upward along the VCU equipment combustion tube 23.

[0036] At this time, in the modified VCU system, fresh air passes through the combustion-supporting fan 19, and the air volume is controlled by the regulating valve 21. The fresh air is discharged along the heat exchanger inlet pipe 7 and the high-temperature clean flue gas discharged from the bottom of the VCU equipment combustion tube 23 is exchanged in the heat exchanger 17 to recycle the heat energy. The high-temperature clean flue gas is discharged after the temperature is reduced, and the exhaust flue gas can be safely sampled and tested manually through the detection port 22; the fresh air is heated after heat exchange and discharged from the heat exchanger outlet pipe 8. At this time, the fresh air temperature is relatively high and can be discharged to a designated location or equipment for waste heat recovery.

[0037] According to the requirements of the Environmental Protection Bureau, before the environmental protection acceptance of the project, the exhaust gas values ​​need to be manually detected and compared with the values ​​of the online monitoring equipment; under high-temperature flue gas conditions, manual sampling is not possible; the high-temperature flue gas treated by the VCU system for waste heat utilization of the utility model is discharged after heat exchange, and the temperature is reduced, which can meet the conditions for manual online sampling, so that numerical comparison can be carried out and the project can be successfully accepted; and after the exhaust gas heat exchange, the heat energy is recovered and utilized, and the high-temperature gas after heat exchange can produce hot water or use waste heat such as heating for instruments and equipment.

[0038] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A VCU system for waste heat utilization, characterized in that It includes the VCU equipment combustion cylinder, air intake pipeline unit, natural gas pipeline unit, combustion-supporting pipeline unit and waste heat recovery pipeline unit; The VCU equipment combustion tube is erected on the horizontal ground and the top is connected to the atmosphere. The bottom of the VCU equipment combustion tube is provided with a burner, and also includes an ignition rod, which passes through the side wall of the VCU equipment combustion tube from the outside and extends to the top of the burner; The air intake pipeline unit includes an exhaust gas inlet main pipeline, a liquid separation tank, a system fan inlet main pipeline, a system fan and a system fan outlet main pipeline which are arranged in sequence; the system fan outlet main pipeline is connected to the burner at the bottom of the combustion cylinder of the VCU equipment; The natural gas pipeline unit includes a natural gas intake main pipe, the rear end of which is divided into two pipes: a burner main fire pipe and a burner ignition pipe. The burner main fire pipe is connected to the system fan outlet main pipe, and the burner ignition pipe is connected to the ignition rod to provide natural gas supply; The combustion-supporting pipeline unit includes a combustion-supporting fan connected between the fresh air and the burner at the bottom of the combustion tube of the VCU equipment; The waste heat recovery pipeline unit includes a heat exchanger built into the combustion tube of the VCU equipment, a heat exchanger inlet pipeline and a heat exchanger outlet pipeline; the combustion-supporting fan is connected to the heat exchanger through the heat exchanger inlet pipeline; the heat exchanger outlet pipeline connects the heat exchanger to the waste heat treatment recovery terminal equipment.

2. The VCU system for waste heat utilization according to claim 1, characterized in that: A rectangular damper is also provided on the periphery of the bottom burner in the combustion tube of the VCU device; the ignition rod passes through the side wall of the combustion tube of the VCU device through the flange interface from the outside and extends to the top of the burner; the flange interface is a hollow structure and is fixedly connected to the side wall of the combustion tube of the VCU device.

3. The VCU system for waste heat utilization according to claim 1, characterized in that: The combustion tube of the VCU equipment is erected on the ground by connecting with the pre-buried anchor bolt flange and is directly connected with the atmosphere.

4. The VCU system for waste heat utilization according to claim 1, characterized in that: The system fan inlet and outlet are respectively provided with a system fan inlet flame arrester and a system fan outlet flame arrester, which are connected through pipelines in the form of flanges.

5. The VCU system for waste heat utilization according to claim 1, characterized in that: The liquid separation tank, the system fan and the burner are connected to each other through pipelines in a flange connection manner.

6. The VCU system for waste heat utilization according to claim 1, characterized in that: The natural gas intake main pipe is connected to the burner main fire pipeline and the burner ignition pipeline by a three-way flange; the burner main fire pipeline is connected to the system fan outlet main pipeline by a flange, and the burner ignition pipeline is connected to the ignition rod by a threaded connection.

7. The VCU system for waste heat utilization according to claim 1, characterized in that: The combustion-supporting pipeline unit also includes a combustion-supporting fan outlet main pipeline, a combustion-supporting fan main fire pipeline, and a combustion-supporting fan ignition pipeline. The combustion-supporting fan is connected to the burner via the combustion-supporting fan main fire pipeline, and the combustion-supporting fan is connected to the ignition rod via the combustion-supporting fan ignition pipeline; the combustion-supporting fan outlet main pipeline, the combustion-supporting fan main fire pipeline, and the combustion-supporting fan ignition pipeline are connected by flanges.

8. The VCU system for waste heat utilization according to claim 7, characterized in that: A first regulating valve is arranged on the main fire pipeline of the combustion-supporting fan between the combustion-supporting fan and the burner.

9. The VCU system for waste heat utilization according to claim 1, characterized in that: A second regulating valve is provided on the heat exchanger inlet pipeline between the combustion-supporting fan and the heat exchanger.

10. The VCU system for waste heat utilization according to claim 1, characterized in that: The combustion tube of the VCU equipment is also provided with a detection port.