阅读说明：本技术 一种组合式蒸汽引射装置 (Combined steam injection device ) 是由 陈永彬 唐江 明小林 杨光贤 黄旭初 向泽岗 赵志忠 洪晓敏 胡俊刚 李夕华 罗 于 2019-10-24 设计创作，主要内容包括：本发明公开一种组合式蒸汽引射装置,属于引射器技术领域。所述组合式蒸汽引射装置包括若干个彼此独立设置的引射器和连接部,其中,若干个所述引射器均与所述连接部密封连接,若干个所述引射器上均设置有节流机构,用于单独控制每一个所述引射器中工作流体的流量；所述引射器通过所述连接部与外部的蒸汽管道连通。本发明提供的一种组合式蒸汽引射装置中,若干个所述引射器上均设置有节流机构,用于单独控制每一个所述引射器中工作流体的流量,当外部气体参数变化,特别是在排出气体流量大幅变化的情况下,可通过调节每一个所述引射器中工作流体的流量,使所述组合式蒸汽引射装置达到最佳引射条件,满足其所需要的引射性能。(the invention discloses a combined steam ejector device, and belongs to the technical field of ejectors. The combined steam ejector device comprises a plurality of ejectors and a connecting part which are arranged independently, wherein the ejectors are all connected with the connecting part in a sealing way, and throttling mechanisms are arranged on the ejectors and used for independently controlling the flow of working fluid in each ejector; the ejector is communicated with an external steam pipeline through the connecting part. In the combined steam ejector provided by the invention, the plurality of ejectors are respectively provided with the throttling mechanisms for independently controlling the flow of the working fluid in each ejector, and when the external gas parameters change, particularly under the condition of great change of the flow of the discharged gas, the combined steam ejector can reach the optimal ejection condition by adjusting the flow of the working fluid in each ejector, so that the required ejection performance is met.)

1. The combined steam ejector device is characterized by comprising a plurality of ejectors (1) and a connecting part (2), wherein the ejectors (1) and the connecting part (2) are independently arranged, the ejectors (1) are hermetically connected with the connecting part (2), and a throttling mechanism is arranged on each ejector (1) and used for independently controlling the flow of working fluid in each ejector (1); the ejector (1) is communicated with an external steam pipeline through the connecting part (2).

2. The combined steam ejector device according to claim 1, wherein the ejector (1) comprises a high-pressure steam chamber (10), a low-pressure steam chamber (11) and a mixed steam chamber (12) which are communicated with each other, wherein the side walls of the high-pressure steam chamber (10) and the low-pressure steam chamber (11) are respectively provided with a working fluid inlet (13) and an ejector fluid inlet (14); one end of the high-pressure steam chamber (10) is communicated with a nozzle (15), the nozzle (15) penetrates through the end face of the low-pressure steam chamber (11) and extends into the low-pressure steam chamber (11), and the outlet of the nozzle (15) is tightly attached to the inlet of the mixed steam chamber (12).

3. The combined steam injection device according to claim 2, wherein the throttling mechanism comprises an actuator (30), a valve rod (31) and a valve core (32), wherein the actuator (30) is fixed at one end of the high-pressure steam chamber (10), one end of the valve rod (31) is fixedly connected with the actuator (30), and the other end of the valve rod passes through the high-pressure steam chamber (10) and is fixedly connected with the valve core (32); the valve rod (31) is connected with the high-pressure steam chamber (10) in a sliding sealing mode, and the actuating mechanism (30) can drive the valve core (32) to move in the middle of the nozzle (15) through the valve rod (31), so that the flow of working fluid is adjusted.

4. The combined steam ejector device as in claim 3, wherein the high pressure steam chamber (10) is internally and fixedly provided with a guide sleeve (310) which supports and guides the valve rod (31) to slide along a straight line, so that the throttling mechanism can adjust the working fluid more accurately.

5. The combined steam injection device according to claim 2, wherein the mixing steam chamber (12) comprises a mixing cavity (16), a throat (17) and a diffuser pipe (18) which are sequentially communicated, and the diffuser pipe (18) is connected with the connecting part (2).

6. The combined steam injection device as claimed in claim 2, wherein a positioning support block (150) is fixedly arranged at the tail end of the nozzle (15), a groove (110) is formed in the end face of the low-pressure steam chamber (11), and the positioning support block (150) is fixed in the groove (110) through a screw; the adjacent end surfaces of the high-pressure steam chamber (10) and the low-pressure steam chamber (11) are fixedly connected by bolts; and metal winding gaskets (19) are arranged between the positioning support block (150) and the bottom of the groove (110) and between the positioning support block (150) and the end face of the high-pressure steam chamber (10).

7. A combined steam eductor device according to claim 2, wherein both the working fluid inlet (13) and the eductor fluid inlet (14) are in communication with external pipes via flanges (4).

Technical Field

The invention relates to the technical field of ejectors, in particular to a combined type steam ejector.

Background

The working principle of the steam ejector is as follows: the high-pressure steam converts pressure energy into kinetic energy through the nozzle, high-speed jet flow is formed at the outlet of the nozzle, and pumped fluid is injected into the suction chamber due to the extremely strong shearing action between the pumped fluid and working fluid. The turbulent diffusion action of the jet flow boundary layer enables the two flows to exchange mass, momentum and energy, so that the speed of the working fluid is continuously reduced, the speed of the ejector fluid is continuously increased, and a single uniform mixed fluid is formed at a certain position of the mixing chamber. The kinetic energy in the diffuser is converted into pressure energy, and the mixed fluid is discharged out of the ejector after being decelerated and pressurized to a certain back pressure.

The traditional ejector adopts a fixed nozzle structure, in the fixed structure, the flow area of a nozzle is fixed, so that the optimal working condition can be achieved only under the design condition, the conditions of external gas parameter change, such as temperature, pressure, flow and the like, often occur in the actual industrial production, particularly under the condition of great change of the flow of discharged gas, the injection performance of the ejector changes violently, the designed optimal injection performance of the ejector cannot be achieved, and even the conditions of back suction and non-work are generated.

Disclosure of Invention

The invention aims to provide a combined steam ejector device to solve the problems that the existing ejector can only achieve the optimal working condition under the design condition, the ejection performance of the ejector often changes violently due to the change of gas parameters in actual production, and the designed optimal ejection performance of the ejector cannot be achieved.

In order to solve the technical problem, the invention provides a combined steam ejector device which comprises a plurality of ejectors and a connecting part, wherein the ejectors and the connecting part are independently arranged, the ejectors are hermetically connected with the connecting part, and throttling mechanisms are arranged on the ejectors and used for independently controlling the flow of working fluid in each ejector; the ejector is communicated with an external steam pipeline through the connecting part.

Optionally, the ejector includes a high-pressure steam chamber, a low-pressure steam chamber and a mixed steam chamber which are communicated with each other, wherein the side walls of the high-pressure steam chamber and the low-pressure steam chamber are respectively provided with a working fluid inlet and an ejection fluid inlet; one end of the high-pressure steam chamber is communicated with a nozzle, the nozzle penetrates through the end face of the low-pressure steam chamber and extends into the low-pressure steam chamber, and the outlet of the nozzle is tightly attached to the inlet of the mixed steam chamber.

Optionally, the throttling mechanism includes an actuator, a valve rod and a valve core, wherein the actuator is fixed at one end of the high-pressure steam chamber, one end of the valve rod is fixedly connected with the actuator, and the other end of the valve rod penetrates through the high-pressure steam chamber and is fixedly connected with the valve core; the valve rod is connected with the high-pressure steam chamber in a sliding sealing mode, and the actuating mechanism can drive the valve core to move in the middle of the nozzle through the valve rod, so that the flow of working fluid is adjusted.

optionally, a guide sleeve is fixedly arranged inside the high-pressure steam chamber, and supports and guides the valve rod to slide along a straight line, so that the throttling mechanism can regulate the working fluid more accurately.

Optionally, the mixing steam chamber includes a mixing cavity, a throat and a diffuser pipe that communicate in proper order, the diffuser pipe with the connecting portion are connected.

Optionally, a positioning support block is fixedly arranged at the tail end of the nozzle, a groove is formed in the end face of the low-pressure steam chamber, and the positioning support block is fixed in the groove through a screw; the adjacent end surfaces of the high-pressure steam chamber and the low-pressure steam chamber are fixedly connected by bolts; and metal winding gaskets are arranged between the positioning support block and the bottom of the groove and between the positioning support block and the end face of the high-pressure steam chamber.

Optionally, the working fluid inlet and the ejection fluid inlet are both communicated with an external pipeline through flanges.

The combined steam injection device provided by the invention has the following beneficial effects:

(1) The plurality of ejectors are respectively provided with a throttling mechanism for independently controlling the flow of the working fluid in each ejector, and when the external gas parameters change, particularly under the condition of great change of the flow of the discharged gas, the combined steam ejector can reach the optimal ejection condition by adjusting the flow of the working fluid in each ejector, so that the required ejection performance is met;

(2) The plurality of ejectors are independent from each other, and each nozzle independently corresponds to one high-pressure steam chamber, so that the phenomenon that the high-pressure steam chamber blows into the low-pressure steam chamber is avoided;

(3) Each valve core is controlled by the independent valve rod, and the opening and closing degree of the independent nozzle can be adjusted, so that the flow of working fluid passing through the nozzle is controlled;

(4) The valve cores are independent from each other, when the valve cores break down and need to be maintained, the whole device does not need to be closed, and when a single valve rod or valve core is maintained, the device can continuously work, so that the influence on the production process is avoided.

drawings

FIG. 1 is a schematic structural view of a combined steam injection device according to the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

Fig. 3 is a left side view of the combined steam injection device provided by the invention.

Detailed Description

The combined steam ejector provided by the invention is further described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.