A gas mixer suitable for low calorific value gas

Abstract

The utility model relates to a gas engine technical field, especially a kind of gas mixer suitable for low heat value gas, including gas inlet and air inlet, further including the Venturi ejector for mixing air and gas, and with the Venturi ejector series link's cyclone mixer;Venturi ejector throat's ventilation surface can dynamic adjustment.The top surface of spindle is towards the flow direction of gas, the side of the spindle is towards the flow guide port of Venturi ejector, and the flow guide port is communicated with air inlet by a buffer cavity.By changing the existing mixer by the flow rate of air to drive the introduction of gas mode, meet the needs of a large amount of gas, and the spindle of ejector throat adjusts the amount of gas and air, to adapt to the combustion heat value requirement of low heat value gas;Through the setting of cyclone mixer, solve the problem of uneven mixing caused by high inert gas in low heat value gas, to facilitate combustion.

Description

Technical Field

[0001] This utility model relates to the field of gas engine technology, and in particular to a gas mixer suitable for low-calorific-value gas. Background Technology

[0002] The gas mixer is a core component of the fuel supply system of a gas engine. Its main function is to mix gas and air in a certain proportion to form a homogeneous combustible mixture for engine combustion. It has strict requirements on the heat of the gas and the composition of the gas and air. Some oilfield gas and coalbed methane have low calorific value, making them unsuitable for direct use in gas engines. Additional processes are needed to increase the combustible gas content, thus increasing costs. Utility Model Content

[0003] The main purpose of this invention is to provide a gas mixer suitable for low-calorific-value gas, which can directly supply low-calorific-value gas for gas combustion, saving additional gas enrichment costs.

[0004] The inventors analyzed the requirements for gas mixers when processing low-calorific-value gas. First, low-calorific-value gas requires a larger volumetric flow rate to achieve the same energy input, necessitating a mixer with greater flow capacity and lower pressure drop characteristics. Second, a high proportion of non-flammable components affects flame propagation speed and combustion stability, requiring the mixer to provide a more homogeneous mixture to ensure stable combustion.

[0005] The present invention provides a gas mixer suitable for low-calorific-value gas, including a gas inlet and an air inlet, a Venturi ejector for mixing air and gas, and a swirl mixer connected in series with the Venturi ejector; the ventilation surface of the throat of the Venturi ejector can be dynamically adjusted.

[0006] A further improvement is that the throat of the Venturi ejector is provided with a spindle body, which is movable along the axis of the throat of the Venturi ejector. The top surface of the spindle body faces the direction of the gas flow, and the side surface of the spindle body faces the inlet of the Venturi ejector. The inlet is connected to the air inlet through a buffer chamber.

[0007] By changing the existing mixer's method of introducing gas by air flow rate, the entry positions of gas and air are reversed to meet the needs of large quantities of gas. The intake of gas and air is adjusted by the spindle body at the ejector throat to adapt to the combustion calorific value requirements of low-calorific-value gas.

[0008] In a further improvement, the spindle body is driven by a stepper motor.

[0009] In a further improvement, the vortex mixer is located at the outlet of the Venturi ejector.

[0010] In a further improvement, the cyclone mixer is cylindrical in shape, with guide vanes on the cylinder wall at an angle to the cylinder wall and the airflow direction.

[0011] By using a swirl mixer, the problem of uneven mixing of combustible gases caused by high inert gas content in low-calorific-value fuel gas is solved, thus facilitating combustion.

[0012] Further improvements include a gas pretreatment module, which has a gas inlet and supplies gas to the Venturi ejector.

[0013] In a further improvement, the gas pretreatment module includes a heating section, which includes a gas flow channel, an exhaust gas flow chamber, and a heat-conducting partition between the two.

[0014] By incorporating a heating element in the gas pretreatment module, the combustion exhaust gas is used to heat the gas, thereby saving energy.

[0015] The technical solution of this invention has the following technical effects: (1) The gas mixer for low-calorific-value gas provided by this utility model has a top surface of the spindle facing the direction of gas flow and a side surface of the spindle facing the inlet of the Venturi ejector. The inlet is connected to the air inlet through a buffer chamber. This changes the existing method of introducing gas by the air flow rate, and reverses the inlet positions of gas and air to meet the needs of a large amount of gas. The amount of gas and air introduced is adjusted by the spindle at the throat of the ejector to adapt to the calorific value requirements of low-calorific-value gas.

[0016] (2) The gas mixer for low calorific value gas provided by this utility model solves the problem of uneven mixing of combustible gas caused by high inert gas in low calorific value gas by setting a swirl mixer, so as to facilitate combustion. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A schematic diagram of the overall module structure of a gas mixer suitable for low-calorific-value gas is shown; Figure 2 A schematic diagram of the overall structure of a gas mixer suitable for low-calorific-value gas is shown; Figure 3 A schematic diagram of a cyclone mixer is shown.

[0018] In the diagram: 1. Pretreatment module; 11. Gas flow channel; 12. Exhaust gas flow chamber; 13. Heat-conducting baffle; 2. Venturi ejector; 21. Ejector throat; 22. Spindle body; 23. Drain port; 24. Drain port; 3. Swirl mixer; 31. Swirl mixer wall; 32. Guide vane. Detailed Implementation

[0019] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0020] like Figure 1-3 As shown, the overall structure of a gas mixer suitable for low-calorific-value gases is as follows: Figure 1 As shown, it includes a Venturi ejector 2, which is connected to a vortex mixer 3. The Venturi ejector 2 is also pre-loaded with a pre-treatment module 1.

[0021] The Venturi ejector 2 includes an ejector throat 21, and the ejector throat 21 is provided with a spindle body 22. The spindle body 22 is movably mounted on the wall of the Venturi ejector 2 and is driven by a stepper motor fixed to the outer wall of the wall. The top surface of the spindle body 22 faces the direction of the gas flow, and the side surface of the spindle body 22 faces the inlet 23 of the Venturi ejector 2. The inlet 23 is connected to the air inlet through a buffer chamber 24.

[0022] In this embodiment, the existing mixer's method of introducing gas by air flow rate is changed. The entry positions of gas and air are reversed to meet the need for a large amount of gas. The gas and air intake are adjusted by the spindle body at the throat of the ejector to adapt to the combustion calorific value requirements of low-calorific-value gas.

[0023] A vortex mixer 3 is installed after the Venturi ejector 2, and the vortex mixer 3 is located at the gas outlet of the Venturi ejector 2. It should be noted that the gas outlet of the Venturi ejector 2 is not located in the center of the side of the Venturi ejector, but is opened on one side of the protruding part of the spindle body 22 and communicates with the interior of the Venturi ejector 2, thereby avoiding interference with the protruding part of the spindle body.

[0024] The swirl mixer 3 has a cylindrical structure, including a swirl mixer wall 31. A guide vane 32 is fixedly provided on the inner wall of the swirl mixer wall 31. The guide vane 32 is inclined at an angle to the cylinder wall and the airflow direction.

[0025] By using a swirl mixer, the problem of uneven mixing of combustible gases caused by high inert gas content in low-calorific-value fuel gas is solved, thus facilitating combustion.

[0026] A pretreatment module 1 is installed before the Venturi ejector 2. This embodiment demonstrates the preheating function of the pretreatment module 1, which includes a gas flow channel 11, an exhaust gas flow chamber 12, and a heat-conducting baffle 13 between them. The gas flow channel 11 is connected to the gas inlet, and the exhaust gas flow chamber 12 has an exhaust gas passage that introduces part of the combustion exhaust gas. A heat-conducting baffle 13 is installed between the gas flow channel 11 and the exhaust gas flow chamber 12 to heat the gas through the heat of the exhaust gas. The pretreatment module may also include components such as filters.

[0027] After being heated and otherwise pretreated in the pretreatment module, the low-calorific-value gas enters the Venturi ejector. Due to the Venturi effect generated by the narrowing of the throat, it draws air into the mixture. Then it enters the swirl mixer to make the gas mixture more uniform. After passing through subsequent modules, it enters the gas engine cylinder for combustion.

[0028] The above description is merely a preferred embodiment of this utility model and is not intended to limit the invention. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this invention.

Claims

1. A gas mixer suitable for low-calorific-value fuel gas, comprising a gas inlet and an air inlet, characterized in that, It also includes a Venturi ejector for mixing air and fuel gas, and a swirl mixer connected in series with the Venturi ejector; the ventilation surface of the throat of the Venturi ejector can be dynamically adjusted.

2. The gas mixer for low-calorific-value fuel gas as described in claim 1, characterized in that, The throat of the Venturi ejector is provided with a spindle body, which is movable along the axis of the throat of the Venturi ejector.

3. The gas mixer for low-calorific-value gas as described in claim 2, characterized in that, The top surface of the spindle body faces the direction of the gas flow, and the side surface of the spindle body faces the inlet of the Venturi ejector. The inlet is connected to the air inlet through a buffer chamber.

4. The gas mixer suitable for low-calorific-value gas as described in claim 2, characterized in that, The spindle body is driven by a stepper motor.

5. The gas mixer for low-calorific-value fuel gas as described in claim 3, characterized in that, The vortex mixer is located at the outlet of the Venturi ejector.

6. The gas mixer for low-calorific-value fuel gas as described in claim 5, characterized in that, The cyclone mixer is cylindrical in shape, with guide vanes on the cylinder wall at an angle to the cylinder wall and the airflow direction.

7. The gas mixer for low-calorific-value fuel gas as described in claim 1, characterized in that, It also includes a gas pretreatment module, which has a gas inlet and supplies gas to the Venturi ejector.

8. The gas mixer for low-calorific-value gas as described in claim 1, characterized in that, The gas pretreatment module includes a heating section, which includes a gas flow channel, an exhaust gas flow chamber, and a heat-conducting partition between the two.

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