CN113483320A - Ash water low flash steam recycling system - Google Patents

Ash water low flash steam recycling system Download PDF

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Publication number
CN113483320A
CN113483320A CN202110729690.4A CN202110729690A CN113483320A CN 113483320 A CN113483320 A CN 113483320A CN 202110729690 A CN202110729690 A CN 202110729690A CN 113483320 A CN113483320 A CN 113483320A
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CN
China
Prior art keywords
pipeline
steam
water
screw expander
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110729690.4A
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Chinese (zh)
Inventor
肖国
朱月
郭锐
栾义文
张元堂
刘忠磊
郑兵
宋满
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hubei Yihua Chemical Industry Co Ltd
Original Assignee
HUBEI YIHUA CHEMICAL INDUSTRY CO LTD
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HUBEI YIHUA CHEMICAL INDUSTRY CO LTD filed Critical HUBEI YIHUA CHEMICAL INDUSTRY CO LTD
Priority to CN202110729690.4A priority Critical patent/CN113483320A/en
Publication of CN113483320A publication Critical patent/CN113483320A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00Feed-water supply not provided for in other main groups
    • F22D11/02Arrangements of feed-water pumps
    • F22D11/06Arrangements of feed-water pumps for returning condensate to boiler
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10Adaptations for driving, or combinations with, electric generators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00Component parts or details of steam boilers
    • F22B37/02Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/42Applications, arrangements, or dispositions of alarm or automatic safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00Component parts or details of steam boilers
    • F22B37/02Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/50Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency

Abstract

The invention discloses a grey water low flash steam recycling system, which comprises a generator set, a condenser, a condensed water recovery system, a water jet pumping system and a cooling water circulation system, wherein the generator set comprises a screw expander and a generator, the screw expander is connected with the generator through a speed reducer, a steam inlet of the screw expander is communicated with a raw steam pipeline through a steam input pipeline, a steam outlet of the screw expander is communicated with the condenser through a steam output pipeline, the condenser is communicated with a water supply tank through the condensed water recovery system, the condensed water recovery system comprises a condensed water pump and a condensed water flowmeter which are arranged on the condensed water recovery pipeline, the water jet pumping system comprises a water jet air ejector arranged on the water jet pipeline, the water jet system comprises a cooling tower and a circulating cooling water pump which are arranged on a cooling pipeline. The invention realizes the recovery of steam energy on the premise of keeping the original process unchanged, thereby deriving great energy-saving benefit.

Description

Ash water low flash steam recycling system
Technical Field
The invention relates to the technical field of low-temperature waste heat recovery, in particular to a grey water low-flash steam recycling system.
Background
The development of comprehensive utilization of resources is a long-term important technical and economic policy in China and a long-term strategic policy in national economy and social development in China. The popularization and application of the waste heat power generation technology have important significance for saving resources, improving the environmental condition, improving the economic benefit, and realizing the circulation optimization configuration and sustainable development of the resources. The waste pressure and the waste heat of the recycling are used for generating electricity, so that the production electricity consumption of an enterprise can be reduced, the utilization rate of primary fuel is improved on one hand, and the whole energy consumption structure of the enterprise is optimized on the other hand. On a higher level, the optimization of the energy consumption of the enterprise also plays a positive role in relieving the shortage of social energy supply and demand, reducing the coal consumption and the carbon dioxide emission. In the chemical industry, the pressure and the temperature of grey water low flash steam are low, the components are various, and how to reuse the grey water low flash steam is always a difficult point in the industry.
Disclosure of Invention
The invention aims to provide a grey water low flash steam recycling system aiming at the existing technical current situation, so as to achieve the purposes of recycling low-grade energy and fully utilizing surplus resources.
In order to achieve the purpose, the invention adopts the following technical scheme:
a grey water low flash steam recycling system comprises a generator set, a condenser, a condensed water recovery system, a water injection and air exhaust system and a cooling water circulation system; the generator set comprises a screw expander and a generator, and the screw expander is connected with the generator through a speed reducer so as to drag the generator to generate electricity; a steam inlet of the screw expander is communicated with an original steam pipeline through a steam input pipeline, a main steam valve and an adjusting valve are sequentially arranged on the steam input pipeline, a steam outlet of the screw expander is communicated with a condenser through a steam output pipeline, the condenser is communicated with a water supply tank through a condensed water recovery system, and the water supply tank is used for supplying water to a boiler; the condensed water recovery system comprises a condensed water pump and a condensed water flowmeter which are arranged on a condensed water recovery pipeline; the cooling water system comprises a cooling tower and a circulating cooling water pump which are arranged on a cooling pipeline, and the cooling pipeline is a circulating pipeline; the water jet air pumping system comprises a water jet air ejector, a water jet tank and a water jet pump which are arranged on a water jet pipeline, the water jet pipeline is a circulating pipeline, and the water jet air ejector is communicated with the condenser.
Furthermore, a fast closing valve is arranged on a pipeline of the steam input pipeline between the main steam valve and a steam inlet of the screw expander, a pipeline of the steam input pipeline between the main steam valve and the fast closing valve is communicated with a pipeline of the steam output pipeline between a steam outlet of the screw expander and the condenser through a bypass pipeline, and a fast opening valve is arranged on the bypass pipeline.
Furthermore, a pipeline of the steam input pipeline between the main steam valve and the original steam pipeline is communicated with a bleeding pipe, and a bleeding regulating valve is arranged on the bleeding pipe.
Furthermore, the two groups of the condensed water pumps are arranged in parallel on the condensed water recovery pipeline.
Furthermore, the water injection pumps are divided into two groups and are arranged in parallel on the water injection pipeline.
Furthermore, the circulating cooling water pumps are divided into two groups and are arranged on the cooling pipeline in parallel.
Furthermore, a first temperature gauge and a first pressure gauge are arranged on a pipeline between the steam inlet of the regulating valve and the steam inlet of the screw expander, the first temperature gauge and the first pressure gauge are respectively used for measuring the temperature and the pressure of steam input into the screw expander, a second temperature gauge and a second pressure gauge are arranged on a pipeline between a steam outlet of the screw expander and the condenser of the steam output pipeline, and the second temperature gauge and the second pressure gauge are respectively used for measuring the temperature and the pressure of the steam output by the screw expander.
Furthermore, a filter screen is arranged on a pipeline between the main steam valve and the regulating valve on the steam input pipeline.
Furthermore, a pipeline of the steam input pipeline, which is positioned between the main steam valve and the regulating valve, is communicated with a drain pipe, and the drain pipe is provided with a drain valve.
The invention has the beneficial effects that:
the invention has the advantages that the gray water low flash steam recycling system utilizes steam to drive the screw expander to do work and output power, drives the generator to generate electricity, exhausts the exhaust gas for condensation after the screw expander does work, and the condensed water returns to the boiler for recycling, thereby realizing the recovery of steam energy on the premise of keeping the original process unchanged, and deriving huge energy-saving benefits; when the generator set is in emergency stop or overhauled due to faults, steam is treated through the bypass pipeline or the diffusing pipeline, the effect of protecting the system is achieved, and the operation is more flexible.
Drawings
FIG. 1 is a schematic structural diagram of a grey water low flash vapor recycling system of the present invention.
Description of the labeling: 1. the system comprises a diffusion regulating valve, 2, a main steam valve, 3, a filter screen, 4, a drain valve, 5, a regulating valve, 6, a regulating valve, 7, a first thermometer, 8, a first pressure gauge, 9, a screw expander, 10, a speed reducer, 11, a generator, 12, a second thermometer, 13, a second pressure gauge, 14, a condenser, 15, a condensate pump, 16, a condensate flowmeter, 17, a water jet air ejector, 18, a water jet box, 19, a water jet pump, 20, a quick-opening valve, 21, a cooling tower, 22 and a circulating cooling water pump.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1, a grey water low flash steam recycling system includes a generator set, a condenser 14, a condensed water recycling system, a water injection and air extraction system, and a cooling water circulation system.
The generator set comprises a screw expander 9 and a generator 11, wherein the screw expander 9 is connected with the generator 11 through a speed reducer 10 to drag the generator 11 to generate electricity. The screw expander 9 is a device capable of reducing temperature and pressure and outputting power at the same time, and is specifically described as follows:
the screw expander 9 has the structural characteristics that: the basic structure of the screw expander 9 is composed of a pair of male and female rotors, a support bearing, a cooling water jacket, a mechanical seal, a regulating valve and a casing.
The working principle of the screw expander 9 is as follows: the working medium enters the tooth grooves of the screw, the pressure pushes the screw to rotate, the volume of the tooth grooves is increased, the fluid is decompressed and expanded to work, and the power is output from the male rotor to realize energy conversion.
The screw expander 9 has the technical characteristics that:
a. the positive displacement power machine can regulate speed steplessly. The flow speed in the machine body is lower, so that higher internal efficiency can be obtained, and the efficiency is higher than that of a steam turbine with the same power. When working medium or load, waste heat and residual pressure parameters change, stable high efficiency can be maintained, and the operation is still stable, safe and reliable.
b. The structure and the principle are different from those of a steam turbine, the steam turbine can adapt to various fluids with different qualities, and the steam turbine is the only domestic thermal power machine which can be simultaneously suitable for superheated steam, saturated steam, steam-water two-phase, hot water and high-salt hot fluid.
c. Has automatic descaling capacity and low requirement on working media. Before the working medium enters the machine body, the working medium does not need to be processed by any thermal engineering (such as an internal evaporation flash tank, a steam-water separator and the like).
d. The operation is simple and the maintenance is convenient, the screw rotor is thick and solid, the long-term overhaul can be realized, the minor overhaul is simple and easy, the operation and maintenance cost is low, and special technical personnel are not needed.
The steam inlet of the screw expander 9 is communicated with an original steam pipeline through a steam input pipeline, a main steam valve 2 and a regulating valve 5 are sequentially arranged on the steam input pipeline, the steam outlet of the screw expander 9 is communicated with a condenser 14 through a steam output pipeline, the condenser 14 is communicated with a water supply tank (not shown in the figure) through a condensed water recovery system, and the water supply tank is used for supplying water to a boiler.
The condensed water recovery system comprises a condensed water pump 15 and a condensed water flowmeter 16 which are arranged on a condensed water recovery pipeline, and the condensed water is recovered by the condensed water recovery system. Preferably, the two groups of the condensate pumps 15 are arranged in parallel on the condensate recovery pipeline to improve reliability.
The water jet air pumping system comprises a water jet air ejector 17, a water jet tank 18 and a water jet pump 19 which are arranged on a water jet pipeline, the water jet pipeline is a circulating pipeline, the water jet air ejector 17 is communicated with the condenser 14, and the system exhausts air through the water jet air pumping system. Preferably, the water injection pumps 19 are arranged in two groups and are arranged in parallel on the water injection pipeline to improve the reliability.
The cooling water system comprises a cooling tower 21 and a circulating cooling water pump 22 which are arranged on a cooling pipeline, the cooling pipeline is a circulating pipeline, and the system carries out oil-water heat exchange, water-water heat exchange and steam-water heat exchange through the cooling water system. Preferably, the circulating cooling water pumps 22 are arranged in two groups and are arranged on the cooling pipeline in parallel, so as to improve the reliability. When the actual equipment is selected, the circulating cooling water pump 22 is a single-stage double-suction horizontal centrifugal pump, and the cooling tower 21 is a combined counter-flow mechanical ventilation cooling tower.
Wherein, the pipeline that the steam input pipeline is located between the steam inlet of governing valve 6 and screw expander 9 is equipped with first thermometer 7 and first manometer 8, and first thermometer 7 and first manometer 8 are used for measuring the temperature and the pressure of the steam of input screw expander 9 respectively, the pipeline that the steam output pipeline is located between the steam outlet of screw expander 9 and condenser 14 is equipped with second thermometer 12 and second manometer 13, and second thermometer 12 and second manometer 13 are used for measuring the temperature and the pressure of the output steam of screw expander 9 respectively.
The steam input pipeline is provided with a filter screen 3 on a pipeline between the main steam valve 2 and the regulating valve 6, impurities are filtered through the filter screen 3, and blockage of a rear instrument is avoided.
The pipeline of the steam input pipeline between the main steam valve 2 and the regulating valve 6 is communicated with a drain pipe, and the drain pipe is provided with a drain valve 4. The non-condensable gas such as steam condensate and air in the steam input pipeline is automatically discharged through the drain pipe, and the steam does not leak.
According to the technical scheme, the gray water low-flash steam recycling system utilizes steam to drive the screw expander 9 to do work and output power, the generator 11 is dragged to generate electricity, the screw expander 9 exhausts the exhaust gas after doing work and condenses, and condensed water returns to the boiler for recycling, so that the recovery of steam energy is realized on the premise of keeping the original process unchanged.
As one embodiment, a quick-closing valve 5 is arranged on a pipeline of the steam input pipeline between the main steam valve 2 and a steam inlet of the screw expander 9, a pipeline of the steam input pipeline between the main steam valve 2 and the quick-closing valve 5 is communicated with a pipeline of the steam output pipeline between a steam outlet of the screw expander 9 and the condenser 14 through a bypass pipeline, and a quick-opening valve 20 is arranged on the bypass pipeline.
As another embodiment, the pipeline of the steam input pipeline between the main steam valve 2 and the original steam pipeline is communicated with a bleeding pipe, and a bleeding regulating valve 1 is arranged on the bleeding pipe.
According to the two embodiments, the normal process flow is as follows: steam → generator set → condenser 14 → feed tank. When the generator set is in a fault emergency stop or is overhauled, the quick opening valve 20 on the bypass pipeline can be started according to the steam inlet pressure, and steam enters the condenser 14 to be condensed and recycled into water for continuous utilization; when the generator set is suddenly stopped or overhauled due to faults, the diffusion regulating valve 1 on the diffusion pipe can be started according to the steam inlet pressure, and steam enters the diffusion pipe to be diffused. The two modes can achieve the effect of protecting the system when the generator set is in emergency stop or overhaul due to faults, and the operation is more flexible.
Specifically, when the operating conditions are as follows: a grey water low flash evaporation steam line with steam pressure of 0.25MPaA, temperature of 127 ℃, flow rate of 13.5t/H and component H2、CO2、NH3And the main equipment adopting the grey water low flash steam recycling system is selected as follows:
screw expander 9: the model SEPG is 1000-1600/3000-1.35-C, the rated power is 1400kW, the rated steam admission amount is 27t/h, the rated steam admission pressure is 0.25MPaA, the rated steam admission temperature is 127 ℃, the rated exhaust pressure is 0.02MPaA, the rated exhaust temperature is 60 ℃, and the rated rotating speed is 3000 rpm.
Speed reducer 10: the transmission power is 1600kW, the speed ratio is 2.0, the input rotating speed is 3000rpm, and the output rotating speed is 1500 rpm.
The generator 11: model 1600Kw-2P-1500rpm, rated power 1600kW, rated voltage 10kV, rated frequency 50Hz, power factor 0.8 and rated rotation speed 1500 rpm.
After the grey water low-flash steam recycling system is technically improved, the net generating power of the generator set can reach 1230kW, the generator set operates 8000 hours per year, and the annual power generation is 984 ten thousand degrees.
It should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, therefore, all equivalent changes in the principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A grey water low flash steam recycling system is characterized in that: the system comprises a generator set, a condenser, a condensed water recovery system, a water injection and air exhaust system and a cooling water circulation system; the generator set comprises a screw expander and a generator, and the screw expander is connected with the generator through a speed reducer so as to drag the generator to generate electricity; a steam inlet of the screw expander is communicated with an original steam pipeline through a steam input pipeline, a main steam valve and an adjusting valve are sequentially arranged on the steam input pipeline, a steam outlet of the screw expander is communicated with a condenser through a steam output pipeline, the condenser is communicated with a water supply tank through a condensed water recovery system, and the water supply tank is used for supplying water to a boiler; the condensed water recovery system comprises a condensed water pump and a condensed water flowmeter which are arranged on a condensed water recovery pipeline; the cooling water system comprises a cooling tower and a circulating cooling water pump which are arranged on a cooling pipeline, and the cooling pipeline is a circulating pipeline; the water jet air pumping system comprises a water jet air ejector, a water jet tank and a water jet pump which are arranged on a water jet pipeline, the water jet pipeline is a circulating pipeline, and the water jet air ejector is communicated with the condenser.
2. The grey water low flash steam recycling system of claim 1, wherein: the steam input pipeline is provided with a quick-closing valve on a pipeline between the main steam valve and a steam inlet of the screw expander, the pipeline between the main steam valve and the quick-closing valve of the steam input pipeline is communicated with a pipeline between a steam outlet of the screw expander and the condenser through a bypass pipeline and a steam output pipeline, and the bypass pipeline is provided with a quick-opening valve.
3. A grey water low flash steam recycling system as claimed in claim 1 or 2 wherein: the pipeline of the steam input pipeline between the main steam valve and the original steam pipeline is communicated with the bleeding pipe, and the bleeding pipe is provided with a bleeding regulating valve.
4. The grey water low flash steam recycling system of claim 1, wherein: the two groups of the condensed water pumps are arranged in parallel on the condensed water recovery pipeline.
5. The grey water low flash steam recycling system of claim 1, wherein: the water jetting pumps are divided into two groups and are arranged in parallel on the water jetting pipeline.
6. The grey water low flash steam recycling system of claim 1, wherein: the circulating cooling water pumps are divided into two groups and are arranged on the cooling pipeline in parallel.
7. The grey water low flash steam recycling system of claim 1, wherein: the steam input pipeline is provided with a first temperature gauge and a first pressure gauge on a pipeline between the regulating valve and a steam inlet of the screw expander, the first temperature gauge and the first pressure gauge are respectively used for measuring the temperature and the pressure of steam input into the screw expander, the steam output pipeline is provided with a second temperature gauge and a second pressure gauge on a pipeline between a steam outlet of the screw expander and the condenser, and the second temperature gauge and the second pressure gauge are respectively used for measuring the temperature and the pressure of the steam output by the screw expander.
8. The grey water low flash steam recycling system of claim 1, wherein: and a filter screen is arranged on a pipeline between the main steam valve and the regulating valve on the steam input pipeline.
9. The grey water low flash steam recycling system of claim 1, wherein: the pipeline of the steam input pipeline between the main steam valve and the regulating valve is communicated with a drain pipe, and the drain pipe is provided with a drain valve.
CN202110729690.4A 2021-06-29 2021-06-29 Ash water low flash steam recycling system Pending CN113483320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110729690.4A CN113483320A (en) 2021-06-29 2021-06-29 Ash water low flash steam recycling system

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Application Number Priority Date Filing Date Title
CN202110729690.4A CN113483320A (en) 2021-06-29 2021-06-29 Ash water low flash steam recycling system

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CN113483320A true CN113483320A (en) 2021-10-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114542201A (en) * 2022-02-25 2022-05-27 杭州汽轮机股份有限公司 Hot water waste heat utilization steam turbine flow control system based on flash evaporation technology

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103075211A (en) * 2013-01-09 2013-05-01 北京世纪源博科技股份有限公司 Thermosyphon waste heat power generating system
CN207348914U (en) * 2017-08-21 2018-05-11 山西铁峰化工有限公司 A kind of device that step screw expansion power generation is carried out using steam waste heat

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103075211A (en) * 2013-01-09 2013-05-01 北京世纪源博科技股份有限公司 Thermosyphon waste heat power generating system
CN207348914U (en) * 2017-08-21 2018-05-11 山西铁峰化工有限公司 A kind of device that step screw expansion power generation is carried out using steam waste heat

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114542201A (en) * 2022-02-25 2022-05-27 杭州汽轮机股份有限公司 Hot water waste heat utilization steam turbine flow control system based on flash evaporation technology
CN114542201B (en) * 2022-02-25 2024-03-29 杭州汽轮动力集团股份有限公司 Hot water waste heat utilization steam turbine flow control system based on flash evaporation technology

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