Low-pressure steam pressure-increasing recycling system

Abstract

The utility model discloses a low-pressure steam pressure-increasing recycling system, which relates to the technical field of energy recovery and power engineering and comprises a steam compressor, low-pressure steam enters the steam compressor through a low-pressure steam inlet pipeline, a first check valve and a self-control regulating valve are arranged on the low-pressure pipeline, and a second check valve is arranged on the self-control regulating valve. The low-pressure steam is discharged through a low-pressure steam outlet pipeline after compression and pressure increasing are conducted on the steam compressor, a butterfly valve, an anti-surge adjusting valve for preventing surge of the steam compressor and a second check valve are sequentially arranged on the outlet pipeline, meanwhile, a desuperheating water supply system is further connected to the outlet pipeline, and desuperheating water can be sprayed into steam through a desuperheating water adjusting valve. Therefore, the steam temperature is adjusted. The steam compressor is controlled by the central control DCS to compress and work low-pressure steam, so that the pressure of the low-pressure steam is gradually increased and converted into reusable high-pressure steam, the utilization efficiency of energy is effectively improved, and energy waste and energy cost of enterprises are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to unmanned plane technical field especially is related to a low pressure steam pressure recovery and utilization system. BACKGROUND

[0002] In numerous industrial production processes, a large amount of low-pressure steam will be generated, such as by-product steam, used steam, process by-product steam, and flash steam of hot liquid. These low-pressure steam cannot directly meet the requirements of industrial production due to low pressure and temperature, and can only be vented or simply waste heat recovered, resulting in a large amount of energy being wasted, and increasing the production cost of enterprises and the heat discharge to the environment. Therefore, how to effectively recycle and utilize these low-pressure steam resources and convert them into usable high-grade energy has become a problem to be solved in the current industrial energy-saving field. SUMMARY

[0003] In order to solve the above problems, the purpose of the utility model is to provide a low-pressure steam pressure recovery and utilization system, comprising:

[0004] A steam compressor comprising a speed increaser, a motor and a lubrication and cooling system, the speed increaser being connected to the motor, the speed increaser being driven to rotate by the motor to compress and increase the pressure of the low-pressure steam, and the lubrication and cooling system being connected to the motor to lubricate and cool the steam compressor;

[0005] A low-pressure steam inlet pipeline, a first check valve and an automatic control valve being sequentially and communicatively arranged on the low-pressure steam inlet pipeline, an outlet of the automatic control valve being in communication with the speed increaser;

[0006] A low-pressure steam outlet pipeline, the low-pressure steam outlet pipeline being fixedly installed at an outlet of the steam compressor and sequentially and communicatively provided with an anti-surge control valve, a butterfly valve and a second check valve on the pipeline, one end of the anti-surge control valve being in communication with the inlet of the steam compressor;

[0007] A desuperheating water supply system comprising a desuperheating water tank for loading cooling water, a desuperheating water pump and a desuperheating water regulating valve, an outlet of the desuperheating water tank being sequentially in communication with the desuperheating water pump and the desuperheating water regulating valve, and an outlet of the desuperheating water regulating valve being in communication with the outlet of the steam compressor;

[0008] A central control DCS system, the central control DCS system being electrically connected to the steam compressor, the lubrication and cooling system and the desuperheating water supply system respectively, and being used for centralized control and monitoring of the equipment.

[0009] Preferably, the compression blades of the supercharger adopt two-stage impellers to ensure that the absolute pressure of the low-pressure steam in the low-pressure steam inlet pipeline is raised to no less than 0.65 MPa, and the impellers are made of one of stainless steel and alloy steel which are resistant to high temperature and high pressure and corrosion.

[0010] Preferably, the lubrication and cooling system adopts an independent circulation loop, and the lubrication and cooling system lubricates and cools each lubrication point of the steam compressor through lubricating oil, so that the temperature of the steam compressor is controlled to be between 40-60 DEG C.

[0011] Preferably, the motor is provided with a frequency conversion cabinet, and the frequency conversion cabinet controls the rotation speed of the motor by controlling current.

[0012] Preferably, the central control DCS system adopts a programmable logic controller (PLC) control system.

[0013] Therefore, the low-pressure steam pressure-raising recycling system has the following beneficial effects compared with the prior art by adopting the above structure:

[0014] (1) The low-pressure steam generated in production is compressed by the steam compressor controlled by the central control DCS system, so that the pressure of the low-pressure steam is gradually increased to be converted into reusable high-pressure steam as the volume of the steam is reduced, the utilization efficiency of energy is effectively improved, and energy waste and energy cost of enterprises are reduced.

[0015] (2) In the utility model, the temperature of the steam is also increased to be superheated steam in the compression process, and in order to make the steam parameters after pressure-raising meet the requirements of subsequent utilization, the temperature needs to be adjusted, the superheated steam discharged from the outlet of the steam compressor is sprayed with appropriate desuperheating water through a desuperheating water supply system, the desuperheating water and the superheated steam are fully mixed, the heat of the steam is absorbed, the temperature of the steam is reduced to an appropriate range, the superheat degree of the steam is also controlled, and the quality of the steam is stable.

[0016] (3) The anti-surge regulating valve is arranged at the outlet of the steam compressor, and the anti-surge regulating valve can be set according to the surge characteristics of the steam compressor, so that the compressor will not surge in the running process. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a general structure schematic view of the embodiment of the low-pressure steam pressure-raising recycling system.

[0018] Reference signs:

[0019] 1, low pressure steam inlet pipeline; 2, first check valve; 3, self-control regulating valve; 4, steam compressor; 41, speed increaser; 42, motor; 43, lubrication cooling system; 5, low pressure steam outlet pipeline; 6, anti-surge regulating valve; 7, second check valve; 8, butterfly valve; 9, desuperheating water supply system; 91, desuperheating water tank; 92, desuperheating water pump; 93, desuperheating water regulating valve; 10, central control DCS system; 11, frequency conversion cabinet. DETAILED DESCRIPTION

[0020] The technical scheme of the present application is further explained by the accompanying drawings and examples.

[0021] Unless otherwise defined, technical terms or scientific terms used in the present application shall be understood as the common meaning understood by a person with ordinary skill in the art to which the present application belongs. The terms "first", "second" and similar words used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] EMBODIMENT

[0023] As Figure 1The utility model discloses a low pressure steam pressure recovery utilization system embodiment's overall structure schematic diagram, this recovery utilization system includes: low pressure steam inlet pipeline 1, steam compressor 4, low pressure steam outlet pipeline 5, desuperheating water supply system 9 and central control DCS system 10, wherein low pressure steam inlet pipeline 1 is sequentially communicated with the first check valve 2 for preventing steam backflow and the automatic control regulating valve 3 for adjusting low pressure steam flow and is communicated with the speeder 41 to realize the low pressure steam compression of sending into steam compressor 4 for the outlet of automatic control regulating valve 3, and its steam compressor 4 includes speeder 41, motor 42 and lubrication cooling system 43, and speeder 41 is connected with motor 42, and is provided with frequency conversion cabinet 11 on motor 42, and frequency conversion cabinet 11 realizes the control of motor 42 rotating speed through the control of the current size on motor 42. Speeder 41 rotates through the drive of motor 42 and realizes the compression and pressure boost of low pressure steam, and the compression blade of pressure booster in this embodiment adopts two-stage impeller, guarantees the absolute pressure of low pressure steam in low pressure steam inlet pipeline 1 to be lifted to not less than 0.65MPa, and the impeller material adopts one of high temperature and high pressure resistant, corrosion resistant stainless steel and alloy steel. Lubrication cooling system 43 adopts independent circulation loop, and lubrication cooling system 43 is connected with motor 42, and its lubrication cooling system 43 lubricates and cools through lubricating oil to each lubrication point of steam compressor 4, controls the temperature of steam compressor 4 between 40-60 DEG C, and guarantees the normal operation of steam compressor 4. Low pressure steam outlet pipeline 5 is fixedly installed at the outlet of steam compressor 4, and is sequentially communicated with anti-surge regulating valve 6, butterfly valve 8 and second check valve 7 on its pipeline, and one end of anti-surge regulating valve 6 is communicated with the inlet of steam compressor 4. At the same time, low pressure steam outlet pipeline 5 is provided with desuperheating water supply system 9, and the desuperheating water supply system 9 includes desuperheating water tank 91 for loading cooling water, desuperheating water pump 92 and desuperheating water regulating valve 93, the outlet of desuperheating water tank 91 is sequentially communicated with desuperheating water pump 92 and desuperheating water regulating valve 93, and the outlet of desuperheating water regulating valve 93 is communicated with the outlet of steam compressor 4. The overheat steam discharged from the outlet of steam compressor 4 is sprayed with appropriate desuperheating water through desuperheating water supply system 9, mixes the desuperheating water and overheat steam fully, absorbs the heat of steam, reduces the temperature of steam to the appropriate range, controls the overheat degree of steam simultaneously, and ensures the stable quality of steam. The recovery utilization system is electrically connected with steam compressor 4, lubrication cooling system 43 and desuperheating water supply system 9 respectively, and the central control DCS system 10 adopts programmable logic controller (PLC) control system, realizes the centralized control and monitoring of equipment.

[0024] Working process and principle: 1) steam compression pressure: low pressure saturated steam from industrial production device, through low pressure steam inlet pipeline 1 into the steam compressor 4. Steam compressor 4 starts, and the low pressure steam is compressed to work, so that its pressure is increased. In the compression process, the temperature of the steam will also be increased, and the superheated steam is obtained; 2) temperature adjustment and stabilization: in order to make the steam parameters meet the requirements of subsequent utilization, the temperature needs to be adjusted, the superheated steam discharged from the steam compressor 4 is sprayed with appropriate amount of desuperheating water through the desuperheating water supply system 9, the desuperheating water and the superheated steam are fully mixed, the heat of the steam is absorbed, the temperature of the steam is reduced to the appropriate range, and the superheat degree of the steam is also controlled, so as to ensure the stability of the quality of the steam; 3) output and reuse: the high pressure steam after temperature adjustment is transported to the high pressure steam pipe network of the factory or other equipment needing high pressure steam through the low pressure steam outlet pipeline 5, and is reused as heat source or power source, which replaces the high pressure steam originally generated by other energy, so as to realize the recycling of low pressure steam, improve the energy utilization efficiency, and reduce the energy cost of enterprises.

[0025] Therefore, in the utility model, the pressure of low pressure steam is gradually increased by steam compressor to convert into reusable high pressure steam, which effectively improves the energy utilization efficiency, reduces energy waste and enterprise energy cost. At the same time, in the compression process of low pressure steam, the superheated steam discharged from the steam compressor is sprayed with appropriate amount of desuperheating water through the desuperheating water supply system, which effectively controls the superheat degree of the steam and ensures the stability of the quality of the steam.

[0026] Finally, it should be pointed out that: the above examples are only used to illustrate the technical scheme of the utility model and not to limit it, although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical scheme of the utility model can still be modified or replaced, and these modifications or replacements cannot make the modified technical scheme deviate from the spirit and scope of the technical scheme of the utility model.

Claims

1. A low pressure steam letdown recovery system, characterized by, It includes: A vapor compressor, including a speed increaser, an electric motor and a lubricating cooling system, the speed increaser is connected with the electric motor, the speed increaser is driven to rotate by the electric motor to realize the compression and pressurization of low-pressure steam, the lubricating cooling system is connected with the electric motor to realize the lubrication and cooling of the vapor compressor; A low-pressure steam inlet pipeline, the first check valve and the automatic control valve are sequentially arranged on the low-pressure steam inlet pipeline, the outlet of the automatic control valve is communicated with the speed increaser; A low-pressure steam outlet pipeline, the low-pressure steam outlet pipeline is fixedly installed at the outlet of the vapor compressor, and the anti-surge regulating valve, the butterfly valve and the second check valve are sequentially arranged on the pipeline, one end of the anti-surge regulating valve is communicated with the inlet of the vapor compressor; A desuperheating water supply system, including a desuperheating water tank for loading cooling water, a desuperheating water pump and a desuperheating water regulating valve, the outlet of the desuperheating water tank is sequentially communicated with the desuperheating water pump and the desuperheating water regulating valve, the outlet of the desuperheating water regulating valve is communicated with the outlet of the vapor compressor; A central control DCS system, the central control DCS system is electrically connected with the vapor compressor, the lubricating cooling system and the desuperheating water supply system respectively, and is used for centralized control and monitoring of the equipment.

2. The low pressure steam letdown recovery system of claim 1, wherein: The compression blades of the speed increaser adopt two-stage impellers, which ensure that the absolute pressure of the low-pressure steam in the low-pressure steam inlet pipeline is raised to not less than 0.65 MPa, and the impeller material adopts one of stainless steel and alloy steel which are resistant to high temperature and high pressure and corrosion.

3. The low pressure steam letdown recovery system of claim 1, wherein: The lubricating cooling system adopts an independent circulating loop, the lubricating cooling system lubricates and cools each lubricating point of the vapor compressor through lubricating oil, and the temperature of the vapor compressor is controlled between 40-60 DEG C.

4. The low pressure steam letdown recovery system of claim 1, wherein: The electric motor is provided with a frequency conversion cabinet, and the frequency conversion cabinet controls the rotation speed of the electric motor by controlling the current.

5. The low pressure steam letdown recovery system of claim 1, wherein: The central control DCS system adopts a programmable logic controller (PLC) control system.

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