Low calorific value waste gas oxygen-enriched combustion system

Abstract

The present application relates to combustion system technical field, provide a kind of low calorific value waste gas oxygen-enriched combustion system, including first heat exchanger, venturi, prechamber and second heat exchanger;The first inlet of the first heat exchanger is used to receive oxygen-enriched combustion-supporting air, the first outlet of the first heat exchanger is communicated with the throat of the venturi, the first outlet of the first heat exchanger is also communicated with the inside of the preheating chamber, the second inlet of the first heat exchanger is used to receive external high-temperature flue gas, the second outlet of the first heat exchanger is communicated with the second inlet of the second heat exchanger, the outlet of the venturi is communicated with the inside of the prechamber, the first inlet of the second heat exchanger is used to receive waste gas, the first outlet of the second heat exchanger is communicated with the inlet of the venturi, the first outlet of the second heat exchanger is also communicated with the inside of the prechamber.

Description

Technical Field

[0001] This invention relates to the field of combustion system technology, and more specifically to a low-calorific-value exhaust gas oxygen-enriched combustion system. Background Technology

[0002] Waste gases emitted by conventional chemical and steel industries have low calorific value and are not easy to burn, making them difficult to recover and reuse. They can only be sent to flares or directly discharged, resulting in a huge waste of energy and pollution of the surrounding environment.

[0003] Currently, some factories mix this waste gas with oxygen-rich air to promote its combustion. However, this method results in slow mixing efficiency and poor mixing effect, which in turn leads to poor combustion performance. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a low-calorific-value exhaust gas oxygen-enriched combustion system that can improve the combustion effect of exhaust gas.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a low-calorific-value exhaust gas oxygen-enriched combustion system, comprising a first heat exchanger, a venturi tube, a pre-combustion chamber, and a second heat exchanger.

[0006] The first inlet of the first heat exchanger is used to receive oxygen-enriched combustion air, the first outlet of the first heat exchanger is connected to the throat of the Venturi tube, and the first outlet of the first heat exchanger is also connected to the interior of the pre-combustion chamber. The second inlet of the first heat exchanger is used to receive external high-temperature flue gas, the second outlet of the first heat exchanger is connected to the second inlet of the second heat exchanger, the outlet of the Venturi tube is connected to the interior of the pre-combustion chamber, the first inlet of the second heat exchanger is used to receive exhaust gas, the first outlet of the second heat exchanger is connected to the inlet of the Venturi tube, and the first outlet of the second heat exchanger is also connected to the interior of the pre-combustion chamber.

[0007] Furthermore, it also includes a first regulating valve, the inlet of which is connected to the first outlet of the first heat exchanger, the outlet of which is connected to the throat of the venturi tube, and the outlet of which is also connected to the interior of the pre-combustion chamber.

[0008] Furthermore, it also includes a cyclone separator, the inlet of which is connected to the outlet of the first regulating valve, and the outlet of which is connected to the interior of the pre-combustion chamber.

[0009] Furthermore, it also includes a second regulating valve, the inlet of which is connected to the first outlet of the second heat exchanger, the outlet of which is connected to the inlet of the venturi tube, and the outlet of which is also connected to the interior of the pre-combustion chamber.

[0010] Furthermore, a plurality of circular nozzles communicating with the interior are fixedly installed on the outer wall of the pre-combustion chamber, and the circular nozzles are connected to the outlet of the second regulating valve.

[0011] Furthermore, a V-shaped blunt body is fixedly installed on the inner wall of the pre-combustion chamber, and the inlet of the V-shaped blunt body is connected to the outlet of the Venturi tube.

[0012] Furthermore, the inner wall of the pre-combustion chamber is lined with castable refractory.

[0013] The beneficial effects of this invention are as follows: This invention provides a low-calorific-value exhaust gas oxygen-enriched combustion system. Under the action of a first heat exchanger and a second heat exchanger, the external high-temperature flue gas heats the oxygen-enriched combustion air and the exhaust gas, respectively. A Venturi tube introduces the oxygen-enriched combustion air into the pre-combustion chamber through a high-speed jet of exhaust gas, thereby increasing the mixing efficiency and improving the mixing effect between the oxygen-enriched combustion air and the exhaust gas, thus enhancing the combustion effect. Attached Figure Description

[0014] Figure 1 This is a flowchart illustrating the structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the internal structure of the pre-combustion chamber.

[0016] Reference numerals: 10-First heat exchanger, 20-Venturi tube, 30-Pre-combustion chamber, 31-Circular nozzle, 32-Blunt body, 40-Second heat exchanger, 50-First regulating valve, 60-Second regulating valve, 70-Swirl generator. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] In this application, unless otherwise expressly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0019] In the description of this application, it should be understood that the terms "longitudinal", "horizontal", "level", "top", "bottom", "upper", "lower", "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0020] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0021] like Figure 1-2 As shown, the present invention provides a low-calorific-value exhaust gas oxygen-enriched combustion system, including a first heat exchanger 10, a venturi tube 20, a pre-combustion chamber 30, and a second heat exchanger 40.

[0022] The first inlet of the first heat exchanger 10 is connected to the first outlet of the first heat exchanger 10, and the second inlet of the first heat exchanger 10 is connected to the second outlet of the first heat exchanger 10. The first inlet of the first heat exchanger 10 is used to receive oxygen-enriched combustion air (pure oxygen or air mixed with a certain amount of pure oxygen), the first outlet of the first heat exchanger 10 is connected to the throat of the Venturi tube 20, and the first outlet of the first heat exchanger 10 is also connected to the interior of the pre-combustion chamber 30. The second inlet of the first heat exchanger 10 is used to receive external high-temperature flue gas, and the second outlet of the first heat exchanger 10 is connected to the second inlet of the second heat exchanger 40.

[0023] The outlet of the venturi tube 20 is connected to the interior of the pre-combustion chamber 30.

[0024] The first inlet of the second heat exchanger 40 is connected to the first outlet of the second heat exchanger 40, and the second inlet of the second heat exchanger 40 is connected to the second outlet of the second heat exchanger 40. The first inlet of the second heat exchanger 40 is used to receive exhaust gas, the first outlet of the second heat exchanger 40 is connected to the inlet of the Venturi tube 20, the first outlet of the second heat exchanger 40 is also connected to the interior of the pre-combustion chamber 30, and the second outlet of the second heat exchanger 40 is connected to an external pipeline.

[0025] During operation, the high-temperature external flue gas enters the first heat exchanger 10 and the second heat exchanger 40 sequentially. Under the action of the first heat exchanger 10 and the second heat exchanger 40, the oxygen-enriched combustion air and the exhaust gas are heated respectively. The heated first portion of the oxygen-enriched combustion air enters the throat of the Venturi tube 20, and the heated first portion of the exhaust gas enters the inlet of the Venturi tube 20. The Venturi tube 20 introduces the corresponding oxygen-enriched combustion air into the pre-combustion chamber 30 through a high-speed jet of this exhaust gas. This results in higher mixing efficiency and better mixing effect between the oxygen-enriched combustion air and the exhaust gas. The oxygen in the oxygen-enriched combustion air effectively reduces the ignition point of the exhaust gas, facilitating ignition and improving combustion efficiency. The heated second portion of the oxygen-enriched combustion air and the second portion of the exhaust gas then enter the pre-combustion chamber 30 for combustion.

[0026] In one embodiment, a first regulating valve 50 is also included. The inlet of the first regulating valve 50 is connected to the first outlet of the first heat exchanger 10, the outlet of the first regulating valve 50 is connected to the throat of the venturi tube 20, and the outlet of the first regulating valve 50 is also connected to the interior of the pre-combustion chamber 30.

[0027] The design of the first regulating valve 50 can control the flow rate of heated oxygen-enriched combustion air into the venturi tube 20 and the pre-combustion chamber 30, making it convenient for operators to control.

[0028] In one embodiment, a cyclone separator 70 is further included, the inlet of which is connected to the outlet of the first regulating valve 50, and the outlet of the cyclone separator 70 is connected to the interior of the pre-combustion chamber 30.

[0029] The design of the cyclone separator 70 can increase the rotation speed of the heated second part of the oxygen-enriched combustion air, thereby making the exhaust gas and the oxygen-enriched combustion air mix and burn better in the pre-combustion chamber 30.

[0030] In one embodiment, a second regulating valve 60 is also included. The inlet of the second regulating valve 60 is connected to the first outlet of the second heat exchanger 40, the outlet of the second regulating valve 60 is connected to the inlet of the venturi tube 20, and the outlet of the second regulating valve 60 is also connected to the interior of the pre-combustion chamber 30.

[0031] The design of the first regulating valve 50 can control the flow rate of heated exhaust gas into the venturi tube 20 and the pre-combustion chamber 30, making it convenient for operators to control.

[0032] In one embodiment, a plurality of circular nozzles 31 communicating with the interior are fixedly installed on the outer wall of the pre-combustion chamber 30. The plurality of circular nozzles 31 are arranged at equal intervals along the circumference and are connected to the outlet of the second regulating valve 60.

[0033] The heated second part of the exhaust gas is injected into the pre-combustion chamber 30 from all sides through multiple circular nozzles 31 on the pre-combustion chamber 30, which further improves the mixing intensity of the exhaust gas and the oxygen-enriched combustion air in the pre-combustion chamber 30, resulting in better combustion effect.

[0034] In one embodiment, a V-shaped blunt body 32 is fixedly installed on the inner wall of the pre-combustion chamber 30. The inlet of the V-shaped blunt body 32 is connected to the outlet of the venturi tube 20, which further improves the spraying effect of the high-speed jet ejected from the venturi tube 20 into the pre-combustion chamber 30.

[0035] In one embodiment, the inner wall of the pre-combustion chamber 30 is lined with castable material, which can play a role in heat storage and promote stable combustion of exhaust gas.

[0036] This system has the following effects:

[0037] 1. The oxygen in the oxygen-enriched combustion air can effectively reduce the ignition point of the exhaust gas, which is conducive to the ignition of the exhaust gas.

[0038] 2. The disturbance of the oxygen-enriched combustion air and pure oxygen in the first heat exchanger 10 can promote the effective mixing of the two.

[0039] 3. The first heat exchanger 10 and the second heat exchanger 40 heat the oxygen-enriched combustion air and the exhaust gas respectively, which facilitates the ignition of the exhaust gas.

[0040] 4. The Venturi tube 20 can effectively promote the mixing of oxygen-enriched combustion air and exhaust gas.

[0041] 5. The castable material around the pre-combustion chamber 30 can play a role in heat storage, which can promote the stable combustion of exhaust gas.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0043] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-calorific-value exhaust gas oxygen-enriched combustion system, characterized in that: It includes a first heat exchanger, a venturi tube, a pre-combustion chamber, and a second heat exchanger; The first inlet of the first heat exchanger is used to receive oxygen-enriched combustion air, the first outlet of the first heat exchanger is connected to the throat of the Venturi tube, and the first outlet of the first heat exchanger is also connected to the interior of the pre-combustion chamber. The second inlet of the first heat exchanger is used to receive external high-temperature flue gas, the second outlet of the first heat exchanger is connected to the second inlet of the second heat exchanger, the outlet of the Venturi tube is connected to the interior of the pre-combustion chamber, the first inlet of the second heat exchanger is used to receive exhaust gas, the first outlet of the second heat exchanger is connected to the inlet of the Venturi tube, and the first outlet of the second heat exchanger is also connected to the interior of the pre-combustion chamber. It also includes a first regulating valve, the inlet of which is connected to the first outlet of the first heat exchanger, the outlet of which is connected to the throat of the venturi tube, and the outlet of which is also connected to the interior of the pre-combustion chamber. It also includes a cyclone separator, the inlet of which is connected to the outlet of the first regulating valve, and the outlet of which is connected to the interior of the pre-combustion chamber; It also includes a second regulating valve, the inlet of which is connected to the first outlet of the second heat exchanger, the outlet of which is connected to the inlet of the venturi tube, and the outlet of which is also connected to the interior of the pre-combustion chamber. A V-shaped blunt body is fixedly installed on the inner wall of the pre-combustion chamber, and the inlet of the V-shaped blunt body is connected to the outlet of the Venturi tube.

2. The low-calorific-value exhaust gas oxygen-enriched combustion system according to claim 1, characterized in that: Multiple circular nozzles communicating with the interior are fixedly installed on the outer wall of the pre-combustion chamber, and the circular nozzles are connected to the outlet of the second regulating valve.

3. The low-calorific-value exhaust gas oxygen-enriched combustion system according to claim 1, characterized in that: The inner wall of the pre-combustion chamber is lined with castable refractory.

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