Energy-saving device of steam ejector

Abstract

The utility model belongs to the technical field of comprehensive utilization of heat energy in the petrochemical industry, and particularly relates to an energy-saving device of a steam ejector, which comprises an inlet 3.5 MPa steam pipeline arranged on the steam ejector. The steam ejector comprises a receiving chamber, a mixing chamber and a diffusion chamber; the inlet 3.5 MPa steam pipeline is connected with the receiving chamber, the mixing chamber is connected with an inlet 1.0 MPa steam pipeline, and the diffusion chamber is connected with an inlet desuperheating water pipeline and a steam ejector outlet pipeline. According to the utility model, the heat energy of the top circulating oil is comprehensively, fully and reasonably utilized, the current situation that 1.0 MPa steam is used for heating the reboiler at the bottom of the desorption tower and the reboiler at the bottom of the depropanization tower to consume the steam is solved, the steam is indirectly saved, and the energy consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the field of thermal energy comprehensive utilization technology in the petrochemical industry, and in particular to an energy-saving device for a steam ejector. Background Technology

[0002] In the petrochemical aromatics extraction unit, the reboilers of the extraction distillation column, solvent recovery column, and solvent regeneration column use 2.2 MPa steam as the heat source for the bottom reboiler to prevent localized overheating of the solvent (sulfolane), which could lead to decomposition, polymerization, and other reactions, causing solvent (sulfolane) degradation and affecting the normal operation of the aromatics extraction unit. The 2.2 MPa steam is obtained by injecting deoxygenated water into 3.5 MPa steam for desuperheating and depressurization, with a normal consumption of approximately 27 t / h. However, the pressure and temperature of the 2.2 MPa steam used for aromatics extraction are lower than those of the 3.5 MPa steam, making this process of desuperheating and depressurizing with 3.5 MPa steam somewhat wasteful.

[0003] Therefore, we propose an energy-saving device for a steam ejector to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of the prior art by proposing an energy-saving device for a steam ejector.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An energy-saving device for a steam ejector includes an inlet 3.5MPa steam pipe disposed on the steam ejector; the steam ejector includes a receiving chamber, a mixing chamber, and a diffuser chamber; the inlet 3.5MPa steam pipe is connected to the receiving chamber, the mixing chamber is connected to an inlet 1.0MPa steam pipe, and the diffuser chamber is connected to an inlet desuperheating water pipe and a steam ejector outlet pipe.

[0007] Preferably, the receiving chamber is connected to a nozzle.

[0008] Preferably, there are two 1.0MPa steam inlet pipes.

[0009] Preferably, a flow controller is provided on the inlet 3.5MPa steam pipe.

[0010] Preferably, the inlet desuperheating water pipe is equipped with a control valve.

[0011] Compared with the prior art, the advantages of this utility model are:

[0012] This invention enables the comprehensive and rational utilization of the thermal energy of the top circulating oil, and also solves the problem of consuming steam by heating the bottom reboiler of the desorption tower and the bottom reboiler of the propane removal tower with 1.0MPa steam, thus indirectly saving steam and reducing energy consumption. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an energy-saving device for a steam ejector proposed in this utility model;

[0014] Figure 2 A cross-sectional view of the energy-saving device for a steam ejector proposed in this utility model;

[0015] Figure 3 A flowchart of an energy-saving device for a steam ejector proposed in this utility model.

[0016] In the diagram: 1. Inlet 3.5MPa steam pipe; 2. Nozzle; 3. Receiving chamber; 4. Mixing chamber; 5. Inlet 1.0MPa steam pipe; 6. Diffuser chamber; 7. Inlet desuperheating water pipe; 8. Steam ejector outlet pipe. Detailed Implementation

[0017] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this embodiment, and not all embodiments.

[0018] Reference Figures 1-3 An energy-saving device for a steam ejector includes an inlet 3.5MPa steam pipe 1 installed on the steam ejector; the steam ejector includes a receiving chamber 3, a mixing chamber 4, and a diffuser chamber 6; the inlet 3.5MPa steam pipe 1 is connected to the receiving chamber, the mixing chamber is connected to an inlet 1.0MPa steam pipe 5, and the diffuser chamber 6 is connected to an inlet desuperheating water pipe 7 and a steam ejector outlet pipe 8.

[0019] In this embodiment, the receiving chamber 3 is connected to the nozzle 2.

[0020] In this embodiment, there are two 1.0MPa steam pipes 5.

[0021] In this embodiment, a flow controller is installed on the 3.5MPa steam pipe 1 at the inlet.

[0022] In this embodiment, a control valve is provided on the inlet desuperheating water pipe 7.

[0023] In this embodiment, the working principle is as follows: the steam ejector uses 3.5MPa steam as the main steam source at the inlet, and at the same time, it draws 1.0MPa steam as the power source for the ejector. The outlet temperature is controlled by medium-pressure deoxygenated water from the pipeline network, and the outlet pressure is controlled by the 3.5MPa steam flow rate at the inlet. The outlet generates steam with a pressure of 1.5 to 2.2MPa to supply the downstream aromatics extraction unit.

[0024] Reference Figure 3 Operating Condition 1: 3.5MPa steam originates from valve #1, passes through S-801 (2.2MPa steam pressure reducer), and then through valve #10 to the medium-pressure steam network, which then supplies steam to the various steam-using equipment in the aromatics extraction unit (at this time, valve #1 controls the downstream pressure, and valve #2 regulates the desuperheating water flow to control the downstream medium-pressure steam temperature). At this time, valves #3, #4, #5, #6, #7, #8, and #9 are closed, and valve #804 (steam ejector) is in a deactivated state.

[0025] Operating Condition 2: 3.5MPa steam flows from valve #5 to valve #4, passes through S-804 (steam ejector), and then through valve #9 to the medium-pressure steam network, eventually reaching the steam-using equipment in the aromatics extraction unit. The downstream pressure is controlled by valve #4. Meanwhile, 1.0MPa steam enters the steam ejector via valves #6 and #7, mixes with the 3.5MPa steam, and is then sent to the downstream medium-pressure steam network for use by the steam-using equipment in the aromatics extraction unit. Desuperheating water enters the steam ejector via valves #3 and #8, and the flow rate is adjusted to control the downstream medium-pressure steam temperature. At this time, valves #1, #2, and #10 are closed, and S-801 (2.2MPa steam pressure reducer) is in a deactivated state.

[0026] Operating Condition 3: S-801 (2.2MPa steam pressure reducer) and S-804 (steam ejector) are used in parallel. At this time, valves 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, and 10# are opened, and S-801 (2.2MPa steam pressure reducer) and S-804 (steam ejector) are put into operation in parallel.

[0027] The above description is only a preferred embodiment of this practice, but the scope of protection of this embodiment is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in this embodiment, based on the technical solution and the inventive concept of this embodiment, should be covered within the scope of protection of this embodiment.

Claims

1. An energy saving device for a steam ejector, characterized by It includes an inlet 3.5MPa steam pipe (1) installed on the steam ejector; the steam ejector includes a receiving chamber (3), a mixing chamber (4), and a diffuser chamber (6); the inlet 3.5MPa steam pipe (1) is connected to the receiving chamber, the mixing chamber is connected to an inlet 1.0MPa steam pipe (5), and the diffuser chamber (6) is connected to an inlet desuperheating water pipe (7) and a steam ejector outlet pipe (8).

2. An energy saving device for a steam ejector as claimed in claim 1, wherein The receiving chamber (3) is connected to a nozzle (2).

3. An energy saving device for a steam ejector as claimed in claim 2, wherein The inlet 1.0MPa steam pipe (5) is provided in two parts.

4. An energy saving device for a steam ejector as claimed in claim 3, wherein A flow controller is installed on the 3.5MPa steam pipe (1) at the inlet.

5. An energy-saving device for a steam ejector according to claim 4, characterized in that, A control valve is installed on the inlet desuperheating water pipe (7).

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