Gas injection mixing device

Abstract

The utility model discloses a gas injection mixing device which comprises an injection pipe, a high-pressure gas inlet box and a gas mixing output part, the high-pressure gas inlet box comprises a high-pressure gas chamber and a depressurization pipe which are connected through a partition plate, a gas adjusting valve body is arranged in the partition plate in a penetrating mode, a cylindrical valve element is arranged in the gas adjusting valve body and connected with a control pull rod, and the control pull rod is connected with the high-pressure gas chamber. A pressure reducing partition plate dividing an inner cavity of the pressure reducing pipe into at least two independent cavities is arranged in the pressure reducing pipe, an air inlet is formed in the bottom wall of the cylindrical valve element, air outlets are formed in the positions, corresponding to the independent cavities, of the adjusting valve body respectively, the positions of the air outlets in the adjusting valve body are arranged in a staggered mode, and a high-pressure air inlet pipe is arranged on the high-pressure air chamber. An end plate is arranged at one end of the injection pipe, Laval spray pipes are arranged at the positions, corresponding to the independent cavities of the depressurization pipe, of the end plate respectively, a plurality of injection partition plates are arranged in the injection pipe to independently isolate each Laval spray pipe in one gas injection cavity, and low-pressure gas inlet pipes are arranged on the side wall of the injection pipe corresponding to the gas injection cavities respectively.

Description

Technical Field

[0001] The utility model relates to a gas injection mixing device. Background Art

[0002] The existing gas injection mixing device, as shown in the adjustable multi-nozzle steam pressure matching device disclosed in patent CN 200310105298.4, uses the movement of the valve stem with a conical end to control the nozzle opening, the gas passing area of ​​the main nozzle throat changes, the working steam flow changes, and the injection steam flow changes. However, an adjustable equal-section mixing chamber diameter is used to coordinate the flow adjustment. If the equal-section mixing chamber diameter is designed according to the optimal size, its adjustment range is low, and the ejector fails at about 70% of the rated flow. If it is designed according to a smaller optimal size, the injection coefficient is very small at 100% working condition, and the ejector efficiency is low. If the main steam temperature is high, the regulating rod is prone to thermal deformation, resulting in the failure of the ejector regulation. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a gas injection mixing device with a larger flow rate adjustable range and a smaller reduction in injection capacity.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a gas injection mixing device, comprising a high-pressure air intake box and a gas mixing output part connected by an injection pipe, the high-pressure air intake box comprises a high-pressure gas chamber and a pressure-reducing pipe which are sealed and connected by a partition plate, and one end of the pressure-reducing pipe is sealed and connected to the end plate of the injection pipe;

[0005] A cylindrical gas regulating valve body with an opening in the high-pressure gas chamber is provided in the partition plate, a cylindrical valve core is movably provided in the gas regulating valve body, and a control rod is connected to the bottom wall of the cylindrical valve core. The control rod seal passes through the side wall of the high-pressure gas chamber and is connected to an electric actuator that drives the control rod to move.

[0006] The pressure reducing pipe is provided with a pressure reducing partition arranged along the length direction to divide its inner cavity into at least two equal independent chambers, at least one air inlet is provided on the bottom wall of the cylindrical valve core, and an air outlet is provided at the position corresponding to each independent chamber on the regulating valve body, and the positions of each air outlet on the regulating valve body are arranged in a staggered manner, and a high-pressure air inlet pipe with a flow regulating valve is provided on the high-pressure air chamber;

[0007] An end plate is provided at one end of the high-pressure air intake box close to the ejector pipe, and an air inlet is respectively provided on the end plate corresponding to each independent chamber of the step-down pipe. The end plate is located on one side of the ejector pipe, and a Laval nozzle is provided at the air inlet. A plurality of ejector baffles are provided in the ejector pipe to isolate each Laval nozzle in a gas ejection chamber. Low-pressure air inlet pipes are respectively provided on the side wall of the ejector pipe corresponding to each gas ejection chamber, and an air inlet valve is provided on the low-pressure air inlet pipe.

[0008] As a preferred solution, the gas mixing output part includes a plurality of mixing single tubes arranged at the outlet of each gas injection chamber, and the outlet end of each mixing single tube is connected to the gas outlet pipe.

[0009] As another preferred solution, the gas mixing output part includes a mixing tube arranged at the outlet end of the ejector tube, and the mixing tube is provided with mixing baffles whose number corresponds to the ejector baffles, and the mixing baffles are arranged on the same plane as the corresponding ejector baffles.

[0010] As a preferred solution, the mixing tube is in the shape of a cone with large ends and a small middle.

[0011] As a preferred solution, the pressure-reducing tube is in the shape of a cone with large ends and a small middle.

[0012] As a preferred solution, a first central tube is provided in the center of the end plate, and the mixing baffle and the ejection baffle are sealed and connected to the first central tube.

[0013] As a preferred solution, the edges of each of the pressure reducing baffles are connected to a second central tube arranged at the axis of the pressure reducing tube.

[0014] As a preferred solution, a sealing tube is provided outside the high-pressure gas chamber, a sealing filler is filled in the sealing tube, a sealing cover for compressing the sealing filler is provided at the outer end of the sealing tube, and the control rod passes through the sealing filler and the sealing cover.

[0015] The beneficial effect of the utility model is that the gas injection mixing device drives the control rod through the electric actuator to drive the cylindrical valve core to move, so that the high-pressure gas coming in from the high-pressure intake pipe enters the different independent chambers in the pressure-reducing pipe through the different gas outlets on the gas regulating valve body, and enters the injection chamber in the injection pipe through the corresponding Laval nozzle, and enters the gas mixing output part together with the low-pressure gas injected into the injection chamber. The overall adjustable flow range of the gas injection mixing device is large, and the injection coefficient is not affected, so that the gas is efficiently mixed.

[0016] Since the gas mixing output part includes a mixing tube arranged at the outlet end of the ejector tube, the mixing tube is provided with mixing baffles corresponding to the ejector baffles in number, and the mixing baffles are arranged on the same plane as the corresponding ejector baffles, the overall structure is more compact.

[0017] Since the mixing tube is in the shape of a cone with large ends and a small middle, the mixed gas can be expanded.

[0018] Since the pressure reducing pipe is in the shape of a cone with large ends and a small middle, the gas entering therein from the gas outlet of the gas regulating valve body can be expanded and input into the ejector pipe more quickly.

[0019] Since the first central tube is arranged at the center of the end plate, the mixing baffle and the ejection baffle are sealed and connected to the first central tube, so that the installation strength of the mixing baffle and the ejection baffle is higher.

[0020] Since the edges of each pressure-reducing partition are connected to the second central tube arranged at the axis of the pressure-reducing tube, the installation strength of the pressure-reducing partition is higher.

[0021] Since a sealing tube is arranged outside the high-pressure gas chamber, a sealing filler is filled in the sealing tube, and a sealing cover for compressing the sealing filler is arranged at the outer end of the sealing tube, the control pull rod passes through the sealing filler and the sealing cover, so that the air tightness of the high-pressure gas chamber is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the front cross-sectional structure of the injection device.

[0023] Figure 2 for Figure 1 Schematic diagram of the AA cross-sectional structure.

[0024] Figure 3 for Figure 1 Schematic diagram of the BB cross-sectional structure.

[0025] Figure 4 for Figure 1 Schematic diagram of the CC cross-sectional structure.

[0026] Figure 5 for Figure 1 Schematic diagram of the DD cross-sectional structure.

[0027] Figure 6 for Figure 1 Schematic diagram of the EE cross-sectional structure.

[0028] Figure 7 Dimensional diagram of the gas injection mixing device used in the simulation experiment in the embodiment.

[0029] Figure 8 This is the pressure cloud diagram of the injection device when the injected steam is 1MPa.

[0030] Fig. 9 This is the temperature cloud diagram of the 1MPa steam injection device.

[0031] Fig.10 This is the velocity cloud diagram of the 1MPa steam injection device.

[0032] In the figure: 1 ejector pipe, 11 end plate, 12 Laval nozzle, 13 ejector baffle, 14 low-pressure air intake pipe, 2 high-pressure air intake box, 21 partition plate, 22 high-pressure air chamber, 23 pressure reducing pipe, 24 gas regulating valve body, 25 cylindrical valve core, 26 control pull rod, 27 electric actuator, 28 pressure reducing baffle, 29 high-pressure air intake pipe, 210 second center pipe, 211 sealing pipe, 212 sealing packing, 213 sealing cover; 3 gas mixing output part, 31 mixing pipe, 32 mixing baffle, 33 first center pipe. DETAILED DESCRIPTION

[0033] The specific implementation scheme of the utility model is described in detail below in conjunction with the accompanying drawings.

[0034] like Figure 1-6 As shown, a gas ejection mixing device comprises a high-pressure air intake box 2 and a gas mixing output part 3 connected via an ejection pipe 1, the high-pressure air intake box 2 comprises a high-pressure gas chamber 22 and a pressure reducing pipe 23 which are sealed and connected via a partition plate 21, and one end of the pressure reducing pipe 23 is sealed and connected to the end plate 11 of the ejection pipe;

[0035] A cylindrical gas regulating valve body 24 with an opening in the high-pressure gas chamber 22 is penetrated through the partition plate 21, and a cylindrical valve core 25 is movably provided in the gas regulating valve body 24. The bottom wall of the cylindrical valve core 25 is connected to a control rod 26. The control rod 26 is sealed and passes through the side wall of the high-pressure gas chamber 22 and is connected to an electric actuator 27 that drives it to move. A sealing tube 211 is provided on the outside of the high-pressure gas chamber 22, and a sealing filler 212 is filled in the sealing tube 211. A sealing cover 213 for compressing the sealing filler 212 is provided at the outer end of the sealing tube 211, and the control rod 26 passes through the sealing filler 212 and the sealing cover 213.

[0036] The pressure reducing pipe 23 is provided with a pressure reducing baffle 28 arranged along the length direction to divide its inner cavity into three equal independent chambers. The edges of each pressure reducing baffle 28 are connected to the second central pipe 210 arranged at the axis of the pressure reducing pipe 23. Two air inlets are arranged on the bottom wall of the cylindrical valve core 25, and an air outlet is respectively arranged at the position corresponding to each independent chamber on the regulating valve body. The positions of each air outlet on the regulating valve body are arranged in a staggered manner. The high-pressure air chamber 22 is provided with a high-pressure air inlet pipe 29 with a flow regulating valve;

[0037] An end plate 11 is provided at one end of the high-pressure air intake box 2 close to the ejector pipe 1, and an air inlet is respectively provided on the end plate 11 corresponding to each independent chamber of the pressure-reducing pipe 23. The end plate 11 is located on one side of the ejector pipe 1 and a Laval nozzle 12 is provided at the air inlet. A plurality of ejector baffles 13 are provided in the ejector pipe 1 to isolate each Laval nozzle 12 in a gas ejection chamber. Low-pressure air inlet pipes 14 are respectively provided on the side wall of the ejector pipe 1 corresponding to each gas ejection chamber, and an air inlet valve is provided on the low-pressure air inlet pipe 14.

[0038] The gas mixing output part 3 includes a mixing tube 31 arranged at the outlet end of the ejector tube 1, and the mixing tube 31 is in the shape of a cone with large ends and a small middle. The mixing tube 31 is provided with mixing baffles 32 corresponding to the number of ejector baffles 13, and the mixing baffles 32 are arranged on the same plane as the corresponding ejector baffles 13. A first central tube 33 is provided at the center of the end plate 11, and the mixing baffles 32 and the ejector baffles 13 are sealed and connected to the first central tube 33.

[0039] The design steam supply of the injection device is set to 50t / h, and the single unit target data under the design condition of 1MPa of induced steam is obtained in Table 1. The design dimensions of the gas injection mixing device are shown in Figure 7 The engineering approximate calculation and numerical simulation results are shown in Table 1 below:

[0040] Table 1

[0041]

[0042]

[0043] The geometric parameters were determined as the preliminary design results using the aerodynamic function method (1-D engineering approximation calculation), and then CFD numerical simulation (3-D) was used to determine its performance. The results are shown in Table 2.

[0044] Table 2 Numerical simulation results of 1MPa steam injection

[0045]

[0046] Figure 8-Figure 10 They are respectively the pressure cloud map, temperature cloud map and velocity cloud map inside the ejector when the outlet mixed steam pressure is 2.3MPa.

[0047] It can be seen from the above that, through the ejector device, the flow rate, flow velocity, temperature and ejection coefficient of the mixed steam can better meet the set requirements.

[0048] The above-mentioned embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A gas injection mixing device, comprising a high-pressure air inlet box and a gas mixing output part connected by an injection pipe, characterized in that: The high-pressure air inlet box comprises a high-pressure air chamber and a pressure-reducing pipe which are sealed and connected via a partition plate, and one end of the pressure-reducing pipe is sealed and connected to the end plate of the ejector pipe; A cylindrical gas regulating valve body with an opening in the high-pressure gas chamber is provided in the partition plate, a cylindrical valve core is movably provided in the gas regulating valve body, and a control rod is connected to the bottom wall of the cylindrical valve core. The control rod seal passes through the side wall of the high-pressure gas chamber and is connected to an electric actuator that drives the control rod to move. The pressure reducing pipe is provided with a pressure reducing partition arranged along the length direction to divide its inner cavity into at least two equal independent chambers, at least one air inlet is provided on the bottom wall of the cylindrical valve core, and an air outlet is provided at the position corresponding to each independent chamber on the regulating valve body, and the positions of each air outlet on the regulating valve body are arranged in a staggered manner, and a high-pressure air inlet pipe with a flow regulating valve is provided on the high-pressure air chamber; An end plate is provided at one end of the high-pressure air intake box close to the ejector pipe, and an air inlet is respectively provided on the end plate corresponding to each independent chamber of the step-down pipe. The end plate is located on one side of the ejector pipe, and a Laval nozzle is provided at the air inlet. A plurality of ejector baffles are provided in the ejector pipe to isolate each Laval nozzle in a gas ejection chamber. Low-pressure air inlet pipes are respectively provided on the side wall of the ejector pipe corresponding to each gas ejection chamber, and an air inlet valve is provided on the low-pressure air inlet pipe.

2. A gas injection mixing device as claimed in claim 1, characterized in that: The gas mixing output part comprises a plurality of mixing single tubes arranged at the outlets of each gas injection chamber, and the outlet end of each mixing single tube is connected to the gas outlet pipe.

3. A gas injection mixing device as claimed in claim 1, characterized in that: The gas mixing output part comprises a mixing tube arranged at the outlet end of the ejector tube, and the mixing tube is provided with mixing baffles corresponding in number to the ejector baffles, and the mixing baffles are arranged on the same plane as the corresponding ejector baffles.

4. A gas injection mixing device as claimed in claim 3, characterized in that: The mixing tube is in a cone shape with large ends and a small middle.

5. A gas injection mixing device as claimed in claim 4, characterized in that: The pressure-reducing pipe is in a cone shape with large ends and a small middle.

6. A gas injection mixing device as claimed in any one of claims 3 to 5, characterized in that: A first central tube is provided at the center of the end plate, and the mixing baffle and the ejection baffle are sealed and connected to the first central tube.

7. A gas injection mixing device as claimed in any one of claims 3 to 5, characterized in that: The edges of each of the depressurization partitions are connected to a second central tube arranged at the axis of the depressurization tube.

8. A gas injection mixing device according to any one of claims 1 to 5, characterized in that: A sealing tube is provided outside the high-pressure gas chamber, a sealing filler is filled in the sealing tube, a sealing cover for pressing the sealing filler is provided at the outer end of the sealing tube, and the control pull rod passes through the sealing filler and the sealing cover.

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