CN111410254A - Injection pump, thermal power plant low-temperature waste heat seawater desalination system and seawater desalination method - Google Patents
Injection pump, thermal power plant low-temperature waste heat seawater desalination system and seawater desalination method Download PDFInfo
- Publication number
- CN111410254A CN111410254A CN202010430259.5A CN202010430259A CN111410254A CN 111410254 A CN111410254 A CN 111410254A CN 202010430259 A CN202010430259 A CN 202010430259A CN 111410254 A CN111410254 A CN 111410254A
- Authority
- CN
- China
- Prior art keywords
- evaporator
- effect
- steam
- seawater
- communicated
- 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
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a jet pump, a thermal power plant low-temperature waste heat seawater desalination system and a seawater desalination method, wherein the seawater desalination system comprises: a plurality of evaporators arranged side by side; the inlet of the drainage flash tank is communicated with a heat source, the steam outlet of the drainage flash tank is communicated with the primary flow inlet of the jet pump, the secondary flow inlet of the jet pump is communicated with the top of each effect of evaporator, and the outlet of the jet pump is communicated with a transverse pipe in the first effect evaporator; a liquid outlet of the drainage flash tank is communicated with a transverse pipe in the first-effect evaporator; the top of each evaporator is provided with a spraying structure, and a strong brine tank of the next-effect evaporator is communicated with the spraying structure in the previous-effect evaporator.
Description
Technical Field
The invention belongs to the technical field of waste heat utilization and seawater desalination of a thermal power plant, and particularly relates to an injection pump, a low-temperature waste heat seawater desalination system of the thermal power plant and a seawater desalination method.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
In recent years, with the development and innovation of technology, domestic high-load and large-scale units occupy the market, and meanwhile, heat energy in the system is difficult to recycle. The steam volume of the circulating hot water and the steam in the shaft seal system drainage flash tank of the power plant unit is huge, and if high-pressure steam directly enters the condenser behind the drainage flash tank, the condenser is easily damaged by overpressure, so that the drainage flash tank mainly reduces the temperature by expansion pressure reduction and water heat exchange with low temperature. At the present stage, the following problems exist in the utilization mode of heat energy in the hydrophobic flash tank: (1) the circulation of low-temperature water needs a high-power circulating pump, and in consideration of process and cost, the low-temperature water is directly discharged after being heated, and heat energy cannot be recycled, so that huge loss of electric energy and heat energy is caused; (2) most of working media of the drainage flash tank are liquid water, and a small part of the working media are saturated hot steam, so that the difficulty of utilizing the heat energy of the part is increased due to the existence of the two working media and the instability of the temperature, the pressure and the like of the working media.
In the aspect of seawater desalination technology, with the development of steam thermal compression low-temperature multi-effect distillation (MED-TVC) technology, the method has the advantage of high heat energy utilization rate, and is easy to combine with enterprises with abundant residual heat resources such as thermal power plants and petrochemical plants to produce fresh water. At the present stage, the MED-TVC technology mostly adopts a high-quality heat source, but a drain flash tank of a power plant is a low-grade heat source and is greatly influenced by the running state of a unit, and the MED-TVC technology has poor adaptability to the working condition.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a jet pump, a thermal power plant low-temperature waste heat seawater desalination system and a seawater desalination method.
In order to achieve the above object, one or more embodiments of the present invention disclose the following technical solutions:
in a first aspect, a jet pump is provided, wherein the rear part of the nozzle is self-adaptively mounted through the moving end of a corrugated pipe, the front part of the nozzle faces to a mixing chamber of the jet pump, the axial direction of the corrugated pipe is the same as the flow direction of the primary flow, and the moving end of the corrugated pipe is the end close to the primary flow inlet.
In a second aspect, a heat-engine plant low-temperature waste heat seawater desalination system is provided, which includes:
a plurality of evaporators arranged side by side;
the inlet of the drainage flash tank is communicated with a heat source, the steam outlet of the drainage flash tank is communicated with the primary flow inlet of the jet pump, the secondary flow inlet of the jet pump is communicated with the top of each effect of evaporator, and the outlet of the jet pump is communicated with a transverse pipe in the first effect evaporator;
a liquid outlet of the drainage flash tank is communicated with a transverse pipe in the first-effect evaporator;
the top of each evaporator is provided with a spraying structure, and a strong brine tank of the next-effect evaporator is communicated with the spraying structure in the previous-effect evaporator.
In a third aspect, a method for desalinating seawater by using low-temperature waste heat of a thermal power plant is provided, which comprises the following steps:
carrying out gas-liquid separation on a steam-water mixture from a thermal power plant in a hydrophobic flash tank, taking the separated steam as primary flow to enter the jet pump, carrying out self-adaptive expansion on a corrugated pipe in the jet pump under the steam pressure, and adjusting the distance between a nozzle and a mixing chamber so as to further carry out adaptive adjustment on the injection quantity of the steam in each evaporator;
steam at the outlet of the jet pump enters a first-effect evaporator to heat and evaporate the sprayed seawater;
the liquid flowing out of the drainage flash tank enters a first-effect evaporator to heat and evaporate the sprayed seawater.
Compared with the prior art, one or more technical schemes of the invention have the following beneficial effects:
the nozzle of jet pump passes through bellows self-adaptation installation, and the axial of bellows is the same with the flow direction of primary flow, so, when the pressure of the steam that flows in as primary flow changes, the axial pressure that the bellows received changes, and then can take place adaptability's flexible, the flexible adaptability who drives the nozzle position of adaptability of bellows adjusts, takes place the adjustment of nozzle and secondary inflow mouth distance promptly, and then changes the injection ability to the steam in the evaporimeter, thereby the steam volume after will mixing maintains in the certain limit. Specifically, when the pressure of the steam flowing out of the drainage flash tank is high (the steam flow is high), the steam presses the corrugated pipe to shorten the length of the corrugated pipe, so that the nozzle is driven to move towards the mixing chamber, the injection capacity of the corrugated pipe is reduced, and the injection steam amount is reduced; when the pressure of the steam flowing out of the drainage flash tank is small (the steam flow is small), the pressure of the steam on the corrugated pipe is reduced, the length of the corrugated pipe is increased, the nozzle is driven to move away from the mixing chamber, the injection capacity of the nozzle is improved, and the injected steam quantity rises. Therefore, the jet pump can better adapt to the instability of a heat source in the drainage flash tank, so that the stability of the steam flow for heating the seawater is ensured, the efficient utilization of the heat source is realized, and the cost of seawater desalination is reduced.
Because the heat source temperature in the first-effect evaporator is highest and gradually decreases backwards, the strong brine tank of the latter-effect evaporator is communicated with the spraying structure in the former-effect evaporator, the brine evaporated in the latter-effect evaporator is repeatedly heated and evaporated by the former-effect evaporator, and the moisture in the seawater can be fully recovered.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a diagram of a low-temperature waste heat recoverer and a low-temperature multi-effect seawater desalination system implemented by the present invention;
fig. 2 is a block diagram of an adaptive nozzle outlet position jet pump according to an embodiment of the present invention.
The system comprises a first jet pump 1, a first-effect evaporator 2, a concentrated brine tank 3, a product water tank 4, a product water tank 5, a second vacuum pump 6, a heat exchanger 7, a water inlet pump 8, a product water discharge pump 9, a concentrated brine discharge pump 10, a hydrophobic flash tank 11, a suction chamber 12, a corrugated pipe 13, a nozzle 14, a mixing chamber 15, a constant-diameter section 16 and a diffusion section.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In a first aspect, a jet pump is provided, wherein the rear part of the nozzle is self-adaptively mounted through the moving end of a corrugated pipe, the front part of the nozzle faces to a mixing chamber of the jet pump, the axial direction of the corrugated pipe is the same as the flow direction of the primary flow, and the moving end of the corrugated pipe is the end close to the primary flow inlet.
In some embodiments, the fixed end of the bellows is attached to the inner wall of the primary flow channel.
Further, the nozzle is coaxially installed on the inner side of the corrugated pipe. So as to ensure the nozzle to move adaptively along with the expansion and contraction of the corrugated pipe.
In a second aspect, a heat-engine plant low-temperature waste heat seawater desalination system is provided, which includes:
a plurality of evaporators arranged side by side;
the inlet of the drainage flash tank is communicated with a heat source, the steam outlet of the drainage flash tank is communicated with the primary flow inlet of the jet pump, the secondary flow inlet of the jet pump is communicated with the top of each effect of evaporator, and the outlet of the jet pump is communicated with a transverse pipe in the first effect evaporator;
a liquid outlet of the drainage flash tank is communicated with a transverse pipe in the first-effect evaporator;
the top of each evaporator is provided with a spraying structure, and a strong brine tank of the next-effect evaporator is communicated with the spraying structure in the previous-effect evaporator.
In some embodiments, the former effect evaporator communicates with a cross tube within the latter effect evaporator.
The steam obtained in the former evaporator can enter the horizontal pipe of the latter evaporator to be used as a heat source to heat and evaporate the sprayed seawater.
Furthermore, the last evaporator and the seawater source are both connected with a heat exchanger, and the steam and the seawater exchange heat in the heat exchanger.
The seawater is heated by the steam generated in the last evaporator, the steam is condensed into product water, the recovery is convenient, the heated seawater is heated and evaporated in the evaporator more easily, and the heat utilization rate is improved.
Furthermore, the transverse pipe of each effect of evaporator is communicated with a product water tank, the product water tank is communicated with the interior of the next effect of evaporator, and the pressure intensity in the next effect of evaporator is smaller than the pressure intensity in the previous effect of evaporator.
Because the pressure in the latter effect evaporator is less than the pressure in the former effect evaporator, when the hot water in the transverse pipe of the former effect evaporator is communicated with the interior of the latter effect evaporator, flash evaporation can occur, and the generated steam is used for heating and evaporating the sprayed seawater, so that the utilization rate of heat can be further improved.
In some embodiments, a concentrated brine flash tank is connected in series with the conduit discharging concentrated brine of each effect of evaporators, and is communicated with the interior of the latter effect of evaporators.
Because the pressure intensity in the latter effect evaporator is less than the pressure intensity in the former effect evaporator, when strong brine produced in the former effect evaporator is communicated with the latter effect evaporator, flash evaporation can occur, and the produced steam is used for heating and evaporating the sprayed seawater, so that the utilization rate of heat can be further improved.
In some embodiments, the connection between the liquid outlet of the hydrophobic flash tank and the first effect evaporator is connected to a source of cryogenic water. The temperature and the flow of the hot water source are adjusted by adding a proper amount of low-temperature water into the high-temperature water, so that the stability of the temperature and the flow of the hot water source is ensured.
In a third aspect, a method for desalinating seawater by using low-temperature waste heat of a thermal power plant is provided, which comprises the following steps:
carrying out gas-liquid separation on a steam-water mixture from a thermal power plant in a hydrophobic flash tank, taking the separated steam as primary flow to enter the jet pump, carrying out self-adaptive expansion on a corrugated pipe in the jet pump under the steam pressure, and adjusting the distance between a nozzle and a mixing chamber so as to further carry out adaptive adjustment on the injection quantity of the steam in each evaporator;
steam at the outlet of the jet pump enters a first-effect evaporator to heat and evaporate the sprayed seawater;
the liquid flowing out of the drainage flash tank enters a first-effect evaporator to heat and evaporate the sprayed seawater.
In some embodiments, steam generated in the evaporator of the former effect enters the transverse pipe of the evaporator of the latter effect to heat and evaporate the sprayed seawater.
In some embodiments, the pressure in the subsequent effect evaporator is controlled to be less than the pressure in the previous effect evaporator.
Further, liquid generated in the transverse pipe of the previous-effect evaporator is communicated with the next-effect evaporator through a product water tank, so that the evaporator is further subjected to flash evaporation.
In some embodiments, the steam in the last evaporator exchanges heat with seawater and then is condensed to obtain product water, and the heated seawater is sprayed in the evaporator and heated for evaporation.
Example 1
The waste heat drive of the steam turbine unit drainage flash tank and the multi-effect distillation are utilized to realize the heat exchange between steam and seawater, the heat energy utilization efficiency is improved through the multi-effect evaporation, and the seawater desalination and water production cost is obviously reduced. The MED-TVC scheme combining the waste heat of the drainage flash tank and seawater desalination specifically comprises the following contents:
MED-TVC seawater desalination system
As shown in fig. 1, the MED-TVC seawater desalination system mainly comprises the following components: the variable working condition jet vacuum pump comprises a variable working condition jet vacuum pump 1, n low-temperature anti-scaling evaporators 2, n concentrated brine tanks (n-1 concentrated brine flash tanks) 3, n product water tanks (n-1 product water flash tanks) 4, a vacuum pump 5, a heat exchanger 6, a water inlet pump 7, a product water discharge pump 8, a concentrated brine discharge pump 9, intelligent detectors (pressure sensors and flow sensors) and the like. In the figure, the dotted line indicates the steam flow direction, and the solid line indicates the liquid water flow direction. According to the system, a series of horizontal tube falling film evaporators are connected in series and are divided into a plurality of effect groups, steam and high-temperature water in a drainage flash tank are used as input heat sources of a multi-effect evaporator, seawater is sprayed to be used as system feeding, and the steam and the high-temperature water are evaporated and condensed for multiple times to achieve heat energy exchange, so that distilled water with multiple times of heating steam and high-temperature water amount is obtained. The working principle of the whole system is illustrated by the following three parts:
steam in the drainage flash tank 10 is taken as a first jet pump 1 to flow through the steam in the ejector evaporator 2 for temperature and pressure reduction and then enters the horizontal pipe on the upper part of the first-effect evaporator 2, and hot water in the drainage flash tank 10 is mixed with low-temperature water for temperature and pressure reduction and then enters the horizontal pipe on the lower part of the first-effect evaporator 2. The heat source and the sprayed seawater exchange heat around the transverse pipe, and steam obtained after seawater evaporation, namely secondary steam, enters the transverse pipe of the next-effect evaporator. And in the first-effect evaporator 2, the steam heat source in the upper part of the horizontal pipe is condensed and then enters the product water tank 4 to return to the boiler water, and the hot water in the lower part of the horizontal pipe is cooled and then also enters the product water tank 4 to return to the boiler water. The rear n-1 effect heat source is condensed and then enters the product water tank.
The inside of the multi-effect evaporator is negative pressure, so that the evaporation temperature is not higher than 70 ℃, the pressure in each effect evaporator is higher than that of the next effect evaporator, the evaporation temperature is 2-3 ℃ higher than that of the next effect evaporator, the evaporation and condensation processes are repeated in each effect evaporator, a product water tank is arranged below each effect evaporator, the pressure of the next effect evaporator is lower than that of the previous effect, so that the product water can be subjected to flash evaporation at the next effect product water tank, steam enters the evaporator and is mixed with secondary steam, the heat can be recycled, and the salt content of the final product water reaches 5-10 mg/L.
The feed seawater enters the MED-TVC system in a reverse feed mode. The feed seawater firstly enters a condenser 6 to exchange heat with the last effect secondary steam, the seawater is heated, and the steam is condensed. Then, part of seawater is discharged into the sea, part of seawater is uniformly sprayed in a rear m-effect (1 or 2) evaporator through a spray pump, and the unevaporated seawater is conveyed into a previous evaporator through a pump until the unevaporated seawater leaves the evaporator in the form of concentrated seawater after the first-effect evaporator and enters a concentrated seawater flash tank. Because the pressure of the evaporator of the latter effect is lower than that of the former effect, the concentrated seawater can be flashed at the flash tank of the concentrated seawater of the latter effect, and the steam enters the evaporator and is mixed with the secondary steam.
The non-condensed steam in the secondary steam of each effect evaporator is pumped into the secondary steam of the next effect, and finally the non-condensed steam in the whole system is gathered at the position of the last effect evaporator and is pumped out by a vacuum pump, namely a jet pump.
(II) solution scheme for flow direction and temperature of two-phase working medium in low-temperature waste heat recoverer
The power plant steam turbine comprises a high pressure cylinder, an intermediate pressure cylinder and a low pressure cylinder, and residual steam and condensed water of the three-section shaft seal system are mixed together to become a two-phase working medium and enter a drainage flash tank. In order to fully utilize the two-phase working medium, as shown in fig. 1, after steam and condensed water are separated by a drainage flash tank 10, the steam is introduced into a part of transverse pipes above a first-effect evaporator in a low-temperature multi-effect seawater desalination system, and the condensed water is introduced into a part of transverse pipes below the first-effect evaporator. By applying the scheme, the heat energy of the two-phase working medium is fully recycled.
The low-temperature multi-effect distillation mode in the seawater desalination scheme is relatively simple and easy to realize, and low-temperature distillation is needed in order to reduce scaling around the transverse pipe, reduce corrosivity and improve heat exchange efficiency, namely the temperature of heating steam of the first-effect evaporator is 70-80 ℃. The temperature of steam and condensed water in the hydrophobic flash tank is about 160 ℃, as shown in fig. 1, in order to meet the requirement of a low-temperature multi-effect distillation system for heating steam, the steam in the hydrophobic flash tank is used as primary flow of a jet pump to inject steam generated by evaporation in each effect of evaporator, and the high-temperature steam is cooled, so that the temperature of gas at the outlet of the jet pump meets the requirement of the first effect of evaporator for heating steam; the liquid water part of the drainage flash tank is added with low-temperature water, so that the water temperature entering the first-effect evaporator meets the requirement.
(III) solution for providing heat source instability for hydrophobic flash tank
Because the heat source in the drainage flash tank is greatly influenced by the running state of the unit, the temperature and the pressure of the heat source both fluctuate greatly. In order to stabilize the steam pressure and temperature entering the evaporator within a certain range, the temperature and pressure of the hot steam are reduced by a variable-load high-efficiency jet pump. As shown in fig. 2, the structure of the variable-load high-efficiency ejector pump adjusts the extension length of a nozzle bellows according to the change of primary flow pressure by adopting a mode of self-adapting to the outlet position of a nozzle, namely, the distance value between the nozzle 13 and a mixing chamber 14 is changed, the injection ratio of an ejector is changed, and the performance is stabilized.
(IV) MED-TVC control system
In order to improve the energy utilization efficiency, improve the water production efficiency and reduce the water production cost, the invention adopts a control method based on the seawater desalination system of the thermal power plant. The control method is based on maintaining material liquid and steam in the evaporator to maintain material balance, and maintaining balanced conditions in the technological process of sea water feeding, strong brine, cooling water, product water, etc. to realize automatic operation.
The system can operate the actuators to be a plurality of variable frequency process water pumps, including a heat source water pump, a seawater feeding pump, a seawater spraying pump in each-effect evaporator, a cooling water discharging pump and a product water discharging pump. The input parameters or control variables of the control system are mainly the rotating speeds of a heat source water pump and a seawater spraying pump, and different heat source steam pressures, mass flow rates and hot water mass flow rates are provided through different rotating speeds; the mass flow rate of the seawater is controlled by adjusting the rotating speed of the seawater spraying pump. The output quantity or controlled parameters of the control system are a system fresh water making ratio and a unit fresh water making energy consumption value, the fresh water making ratio is a mass ratio of steam to hot water provided by the system for fresh water quantity and a heat source, and the unit fresh water making energy consumption is a heat energy value consumed by each volume of fresh water. In the control system, a double-layer control algorithm (a supervision optimization layer and a process control layer) is adopted to realize the control behavior and mapping relation between input and output.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An ejector pump, characterized in that: the rear part of the nozzle is self-adaptively installed through the moving end of the corrugated pipe, the front part of the nozzle faces to a mixing chamber of the jet pump, the axial direction of the corrugated pipe is the same as the flow direction of the primary flow, and the moving end of the corrugated pipe is one end close to the primary flow inlet.
2. The ejector pump of claim 1, wherein: the fixed end of the corrugated pipe is connected to the inner wall of the primary flow channel;
further, the nozzle is coaxially installed on the inner side of the corrugated pipe.
3. A low-temperature waste heat seawater desalination system of a thermal power plant is characterized in that: the method comprises the following steps:
a plurality of evaporators arranged side by side;
the inlet of the drainage flash tank is communicated with a heat source, the steam outlet of the drainage flash tank is communicated with the primary flow inlet of the jet pump, the secondary flow inlet of the jet pump is communicated with the top of each effect of evaporator, and the outlet of the jet pump is communicated with a transverse pipe in the first effect evaporator;
a liquid outlet of the drainage flash tank is communicated with a transverse pipe in the first-effect evaporator;
the top of each evaporator is provided with a spraying structure, and a strong brine tank of the next-effect evaporator is communicated with the spraying structure in the previous-effect evaporator.
4. The thermal power plant low-temperature waste heat seawater desalination system as defined in claim 3, wherein: the front effect evaporator is communicated with a transverse pipe in the rear effect evaporator;
further, the last evaporator and the seawater source are both connected with a heat exchanger, and the steam and the seawater exchange heat in the heat exchanger;
furthermore, the transverse pipe of each effect of evaporator is communicated with a product water tank, the product water tank is communicated with the interior of the next effect of evaporator, and the pressure intensity in the next effect of evaporator is smaller than the pressure intensity in the previous effect of evaporator.
5. The thermal power plant low-temperature waste heat seawater desalination system as defined in claim 3, wherein: the pipeline for discharging the strong brine of each effect of evaporator is connected with a strong brine flash tank in series, and the strong brine flash tank is communicated with the interior of the next effect of evaporator.
6. The thermal power plant low-temperature waste heat seawater desalination system as defined in claim 3, wherein: and a connecting pipeline between a liquid outlet of the drainage flash tank and the first-effect evaporator is connected with a low-temperature water source.
7. A method for desalinating seawater by using low-temperature waste heat of a thermal power plant is characterized by comprising the following steps: the method comprises the following steps:
carrying out gas-liquid separation on a steam-water mixture from a thermal power plant in a hydrophobic flash tank, taking the separated steam as primary flow to enter the jet pump, carrying out self-adaptive expansion on a corrugated pipe in the jet pump under the steam pressure, and adjusting the distance between a nozzle and a mixing chamber so as to further carry out adaptive adjustment on the injection quantity of the steam in each evaporator;
steam at the outlet of the jet pump enters a first-effect evaporator to heat and evaporate the sprayed seawater;
the liquid flowing out of the drainage flash tank enters a first-effect evaporator to heat and evaporate the sprayed seawater.
8. The method for desalinating seawater by using low-temperature waste heat of a thermal power plant according to claim 7, characterized in that: steam generated in the former evaporator enters the transverse pipe of the latter evaporator to heat and evaporate the sprayed seawater.
9. The method for desalinating seawater by using low-temperature waste heat of a thermal power plant according to claim 7, characterized in that: controlling the pressure intensity in the next-effect evaporator to be smaller than the pressure intensity in the previous-effect evaporator;
further, liquid generated in the transverse pipe of the previous-effect evaporator is communicated with the next-effect evaporator through a product water tank, so that the evaporator is further subjected to flash evaporation.
10. The method for desalinating seawater by using low-temperature waste heat of a thermal power plant according to claim 7, characterized in that: and condensing the steam in the last evaporator after heat exchange with the seawater to obtain product water, and spraying, heating and evaporating the heated seawater in the evaporator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010430259.5A CN111410254A (en) | 2020-05-20 | 2020-05-20 | Injection pump, thermal power plant low-temperature waste heat seawater desalination system and seawater desalination method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010430259.5A CN111410254A (en) | 2020-05-20 | 2020-05-20 | Injection pump, thermal power plant low-temperature waste heat seawater desalination system and seawater desalination method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111410254A true CN111410254A (en) | 2020-07-14 |
Family
ID=71490629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010430259.5A Pending CN111410254A (en) | 2020-05-20 | 2020-05-20 | Injection pump, thermal power plant low-temperature waste heat seawater desalination system and seawater desalination method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111410254A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6193897A (en) * | 1984-10-12 | 1986-05-12 | Hitachi Zosen Corp | Apparatus for making ultra-pure water |
| CN1554589A (en) * | 2003-12-26 | 2004-12-15 | 国家海洋局天津海水淡化与综合利用研 | High efficiency sea water desalination device and method by distillation |
| CN106423608A (en) * | 2016-10-26 | 2017-02-22 | 山东大学 | Ejector with spray nozzle position adjustable and device |
| CN106861961A (en) * | 2017-03-10 | 2017-06-20 | 山东大学 | A kind of self-adjustable injector |
| CN109678160A (en) * | 2019-01-23 | 2019-04-26 | 瓮福（集团）有限责任公司 | A kind of fluosilicic acid energy conservation method for concentration |
-
2020
- 2020-05-20 CN CN202010430259.5A patent/CN111410254A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6193897A (en) * | 1984-10-12 | 1986-05-12 | Hitachi Zosen Corp | Apparatus for making ultra-pure water |
| CN1554589A (en) * | 2003-12-26 | 2004-12-15 | 国家海洋局天津海水淡化与综合利用研 | High efficiency sea water desalination device and method by distillation |
| CN106423608A (en) * | 2016-10-26 | 2017-02-22 | 山东大学 | Ejector with spray nozzle position adjustable and device |
| CN106861961A (en) * | 2017-03-10 | 2017-06-20 | 山东大学 | A kind of self-adjustable injector |
| CN109678160A (en) * | 2019-01-23 | 2019-04-26 | 瓮福（集团）有限责任公司 | A kind of fluosilicic acid energy conservation method for concentration |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103265089B (en) | High temperature high efficiency multi-effect seawater distillation desalination apparatus and method | |
| CN101948148A (en) | Energy-saving low-temperature multiple-effect seawater desalting device | |
| CN102336448B (en) | Saline treatment system and method | |
| CN112978829B (en) | Low-temperature multi-effect distillation seawater desalination system and process method thereof | |
| CN104399267B (en) | A kind of flash distillation wave steam recompression continuous evaporation system | |
| CN103112985A (en) | Multi-stage flash distillation seawater desalination system of low-temperature multi-effect steamer vapor compression distillation | |
| CN107445233A (en) | A kind of mechanical compression type multiple-effect distillation seawater desalination system of Coupling Water-source Heat Pump | |
| CN105084445A (en) | Efficient membrane distillation method and device | |
| CN201834781U (en) | Single-stage vacuum distillation seawater desalination device | |
| CN104524793A (en) | MVR evaporator | |
| CN106698564A (en) | Sea water desalinization method by waste heat recovery | |
| CN109798696B (en) | High-temperature heat pump system for recovering waste heat of industrial wastewater by using water as working medium and control method thereof | |
| CN108706668B (en) | Seawater desalination system with multi-mode heating steam source | |
| WO2001072638A1 (en) | Desalination device | |
| CN107461958A (en) | One kind utilizes jet type heat pump recovery chemical fertilizer factory gas making water residual heat system | |
| CN106966462A (en) | A kind of multistage seawater desalting coupled system | |
| CN205061622U (en) | Efficient membrane distillation plant | |
| CN111410254A (en) | Injection pump, thermal power plant low-temperature waste heat seawater desalination system and seawater desalination method | |
| CN106523050B (en) | The composite power circulatory system and its operation method and electricity generation system | |
| CN206397551U (en) | The composite power circulatory system and electricity generation system | |
| CN216141287U (en) | Low-temperature multi-effect distillation seawater desalination system | |
| CN213506068U (en) | Four-effect evaporation concentration system for treating waste water containing calcium chloride | |
| CN201901602U (en) | Energy-saving, low-temperature and multiple-effect sea water desalinating device | |
| CN110615498B (en) | Solar flash steam driven multi-effect forced circulation evaporation system and working method | |
| CN204319794U (en) | A kind of wave steam recompression continuous evaporation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200714 |
|
| RJ01 | Rejection of invention patent application after publication |