CN110514024B - Medium-pressure deaerator exhaust steam recovery device and method - Google Patents
Medium-pressure deaerator exhaust steam recovery device and method Download PDFInfo
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- CN110514024B CN110514024B CN201910716744.6A CN201910716744A CN110514024B CN 110514024 B CN110514024 B CN 110514024B CN 201910716744 A CN201910716744 A CN 201910716744A CN 110514024 B CN110514024 B CN 110514024B
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- 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/02—Auxiliary systems, arrangements, or devices for feeding steam or vapour to condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
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- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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Abstract
The invention discloses a waste steam recovery device and a method for a medium-pressure deaerator, and the device comprises the medium-pressure deaerator, a low-pressure deaerator, a waste steam recovery device and a steam turbine unit oil seal cooling box, wherein the medium-pressure deaerator is connected with the waste steam recovery device through a waste steam conveying pipe, the waste steam recovery device is connected with the low-pressure deaerator through a low-pressure gas conveying pipe, the steam turbine unit oil seal cooling box is connected with the waste steam recovery device through a cooling water input pipe and a cooling water output pipe, and an air outlet pipe is connected to the waste steam recovery device. The method comprises the following steps: the method comprises the steps of medium and low pressure deaerator processing, exhaust steam recovery device processing, pipeline connection installation, cooling device installation and exhaust steam recovery test operation. The waste steam recovery device can recover and treat the gas generated by the medium-pressure deaerator, thereby preventing heat waste and avoiding environmental pollution.
Description
Technical Field
The invention relates to a device and a method for recovering dead steam of a medium-pressure deaerator.
Background
The waste steam recovery is also called residual steam recovery, and the waste steam is waste steam which is discharged in the process and cannot be directly used, and can also be flash steam from condensed water. The recovery of the exhaust steam generally adopts a water absorption method, but the generated hot water is not available.
The existing exhaust steam recovery has low efficiency during heat exchange due to short residence time of the exhaust steam, easily causes heat waste and has certain noise.
Disclosure of Invention
The invention aims to provide the technical scheme of the exhaust steam recovery device and the exhaust steam recovery method for the medium-pressure deaerator, aiming at the defects in the prior art, the design of the exhaust steam recovery device can be used for recovering and treating the gas generated by the medium-pressure deaerator, so that the waste of heat is prevented, and the pollution to the environment is avoided.
In order to solve the technical problems, the invention adopts the following technical scheme:
medium voltage oxygen-eliminating device exhaust steam recovery unit, including medium voltage oxygen-eliminating device and low pressure oxygen-eliminating device, its characterized in that: the steam turbine unit oil seal cooling box is connected with the exhaust steam recovery device through a cooling water input pipe and a cooling water output pipe, the exhaust steam recovery device is connected with an air outlet pipe, and the air outlet pipe is provided with a third stop valve; can carry out recovery processing through exhaust steam recovery unit's design to the gas that middling pressure oxygen-eliminating device produced, prevent to cause thermal waste, avoid causing the pollution to the environment simultaneously, exhaust steam through steam turbine unit oil blanket cooler bin cooling middling pressure oxygen-eliminating device, not only can make the heat whole retrieve, and can the noise elimination, the switch of exhaust steam conveyer pipe can be controlled to first stop valve, make the gas in the middling pressure oxygen-eliminating device get into in the exhaust steam recovery unit, the switch of low pressure gas-supply pipe can be controlled to the second stop valve, carry the liquid after the condensation to the low pressure oxygen-eliminating device in, the switch of outlet duct can be controlled to the third stop valve, be convenient for discharge the gas after the condensation, reduce the pollution to the environment.
Furthermore, a medium-pressure exhaust pipe is arranged at the top end of the medium-pressure deaerator, a medium-pressure exhaust valve is arranged on the medium-pressure exhaust pipe, and the medium-pressure exhaust pipe can be controlled to be opened or closed through the medium-pressure exhaust valve, so that exhaust steam can be controlled conveniently, and the utilization efficiency of the exhaust steam is improved.
Furthermore, the top of low pressure oxygen-eliminating device is provided with the low pressure blast pipe, is provided with low pressure discharge valve on the low pressure blast pipe, can control the switch of low pressure blast pipe through low pressure discharge valve, and then the pressure in the control low pressure oxygen-eliminating device.
Furthermore, the exhaust steam recovery device comprises a cylinder body, wherein a condensation plate is arranged in the cylinder body from top to bottom, the upper and the lower condensation plates are connected through a cooling water connecting pipe, a cooling water inlet port is connected to the upper condensation plate, the cooling water inlet port is matched with a cooling water input pipe, a cooling water outlet port is connected to the lower condensation plate, the cooling water outlet port is matched with a cooling water output pipe, a mist catching device is arranged at the top of the cylinder body, a gas outlet port is connected to the mist catching device, the gas outlet port is matched with a gas outlet pipe, a gas inlet port and a liquid outlet port are respectively arranged on the side surface and the bottom of the cylinder body, the gas inlet port is matched with the exhaust steam conveying pipe, the liquid outlet port is matched with a low-pressure gas conveying pipe, the contact area between the exhaust steam and the cooling water is increased through the design of the condensation plate, the heat exchange efficiency is improved, and the condensed liquid can flow, the steam turbine unit oil seal cooling box is convenient to collect and process in a unified mode, the cooling water connecting pipe can realize circulation of cooling water between an upper condensing disc and a lower condensing disc, the cooling water inlet connector and the cooling water outlet connector are convenient to communicate with the steam turbine unit oil seal cooling box, the mist catching device can catch mist generated by high-temperature steam, liquid drops are formed, and unified collection is facilitated.
Further, the condensation dish slope sets up, and the condensation dish is a with the contained angle of horizontal direction, and the scope of contained angle an is 30 ~ 45, and the condensation dish that the slope set up can make the liquid of formation flow downwards fast, and the evenly distributed of condensation dish is convenient for in the design of this contained angle has prolonged the dwell time of exhaust steam in the barrel simultaneously, further improves heat transfer effect.
Furthermore, the condensation dish includes the disk body, is provided with the business turn over water interface on the top surface of disk body and the bottom surface respectively, and the inside of disk body is provided with the water storage chamber, business turn over water interface and water storage chamber intercommunication, and business turn over water interface is convenient for looks water storage intracavity and is poured into the cooling water in succession, improves the heat exchange efficiency of exhaust steam.
Furthermore, the disk body is provided with air vents which penetrate through the upper surface and the lower surface of the disk body, and the exhaust steam can flow upwards along the side surface of the disk body and rises through the air vents.
Furthermore, the condensate guide groove is formed in the side face of the outer circumference of the disc body and close to one side of the air vent, and condensed liquid flows downwards through the condensate guide groove and cannot block the air vent.
Furthermore, the mist catching device comprises a box body, a mist catching cavity is formed in the box body, a mist catching net is horizontally arranged in the mist catching cavity, the top end of the mist catching cavity is communicated with the air outlet interface, the steam is convenient to collect after forming liquid drops through the mist catching net in the rising process, and the final gas is output through the mist catching cavity and the air outlet interface.
The method for using the dead steam recovery device of the medium-pressure deaerator is characterized by comprising the following steps of:
1) medium and low pressure deaerator processing
a. Firstly, selecting a medium-pressure deaerator and a low-pressure deaerator with proper sizes according to design requirements, and polishing the inner and outer surfaces of shells of the medium-pressure deaerator and the low-pressure deaerator;
b. then installing steam-water separators in the shell respectively, fixedly connecting the steam-water separators in the shell, installing a rotary membrane group on one side of the steam-water separators, wherein the rotary membrane group consists of a water chamber, a steam chamber, a rotary membrane pipe, a condensed water connecting pipe, a make-up water connecting pipe and a primary steam inlet connecting pipe;
c. then a water spraying grate is arranged in the shell and is made of angle-shaped steel which is arranged in a staggered mode up and down, the supplied water which is deoxidized by a membrane rotating group is subjected to secondary distribution, and the supplied water falls on a liquid-steam net arranged below the water spraying grate in a uniform rain-spraying mode;
d. a heat storage filler liquid-vapor net is arranged along the lower part of the water spraying grate, the liquid-vapor net comprises flat steel belts and a cylinder body which are arranged at intervals, a stainless steel wire net is arranged in the liquid-vapor net, water supply is fully contacted with secondary steam at the position, the water supply is heated to the saturation temperature, and deep deoxidization is carried out;
2) processing of exhaust steam recovery device
a. Firstly, determining the size of the exhaust steam recovery device according to design requirements, manufacturing a corresponding cylinder, and polishing the inner surface and the outer surface of the cylinder to meet the requirement of actual exhaust steam recovery;
b. then determining the size of the condensation disc according to the size of the cylinder, forming required disc bodies by pouring, arranging a water storage cavity in each disc body, respectively installing a water inlet and outlet port along the top surface and the bottom surface of each disc body, communicating the water inlet and outlet ports with the water storage cavity, arranging an air vent along a set position on each disc body, enabling the air vent to penetrate through the top surface and the bottom surface of each disc body, arranging condensate flow guide grooves along one side of the outer circumferential side surface of each disc body, close to the air vent, at equal intervals, enabling cooling water to flow in the water storage cavities, improving the contact area between the cooling water and exhaust steam, improving the heat exchange effect, enabling the exhaust steam to flow upwards along the air vent, and enabling formed liquid drops to flow downwards along the top surface and;
c. then, the processed condensation discs are sequentially arranged on the inner side surface of the cylinder body in an inclined manner from top to bottom, so that each condensation disc forms an included angle of 30-45 degrees with the horizontal direction, the two adjacent condensation discs are fixedly connected through a cooling water connecting pipe and are subjected to sealing treatment, a water inlet and outlet interface on the upper condensation disc is in sealing connection with a cooling water inlet interface, a water inlet and outlet interface on the lower condensation disc is in sealing connection with a cooling water outlet interface, an air inlet interface and a liquid outlet interface are respectively arranged along the side surface and the bottom of the cylinder body, and the condensation discs are distributed in an inclined manner from top to bottom, so that the retention time of exhaust steam in the cylinder body is prolonged, the contact area between the exhaust steam and the condensation discs is increased, the heat exchange efficiency is improved, and the condensate is convenient to collect;
d. finally, a box body is arranged on the top surface of the barrel body, a mist catching cavity is formed in the box body, the mist catching cavity penetrates through the bottom surface of the box body, a mist catching net is horizontally arranged along the inner side surface of the mist catching cavity, an air outlet port is arranged on the top surface of the mist catching cavity, the mist catching net can carry out atomization catching on rising hot steam, and finally discharged gas reduces pollution to the environment;
3) pipe connection installation
a. After the medium-pressure deaerator, the low-pressure deaerator and the exhaust steam recovery device are installed, a medium-pressure exhaust pipe is connected to the top surface of the medium-pressure deaerator, a medium-pressure exhaust valve is installed on the medium-pressure exhaust pipe, the medium-pressure exhaust pipe is connected with the exhaust steam recovery device through an exhaust steam conveying pipe, and a first stop valve is installed on the exhaust steam conveying pipe;
b. then connecting the exhaust steam recovery device with a low-pressure deaerator through a low-pressure gas conveying pipe, installing a second stop valve on the low-pressure gas conveying pipe, installing a low-pressure exhaust pipe along the top surface of the low-pressure deaerator, and installing a low-pressure exhaust valve on the low-pressure exhaust pipe;
c. finally, an air outlet pipe is connected to the dead steam recovery device, the air outlet pipe and an air outlet interface are sealed, and a third stop valve is installed on the air outlet pipe;
4) cooling device mounting
Firstly, selecting a proper-size steam turbine unit oil seal cooling box according to design requirements, connecting the steam turbine unit oil seal cooling box with a dead steam recovery device through a cooling water input pipe and a cooling water output pipe, and sealing the connection part;
5) recovery test run of exhaust steam
The water yield of cooling water is controlled through the steam turbine unit oil seal cooling box, the cooling water stably enters the exhaust steam recovery device, the cooling water flows back to the steam turbine unit oil seal cooling box after heat exchange, a medium-pressure exhaust valve on a medium-pressure exhaust pipe is closed, gas in a medium-pressure deaerator enters the exhaust steam recovery device through an exhaust steam conveying pipe, after the heat exchange and pressure reduction, the non-condensable gas is discharged from an outlet pipe, the condensed liquid is input into a low-pressure deaerator through a low-pressure gas conveying pipe, the heat is completely recovered while the noise is eliminated, the operation is convenient and reliable, and the economic benefit is improved.
The exhaust steam recovery processing method has simple steps and strong practicability, not only improves the heat exchange efficiency, but also reduces the emission of harmful gas and eliminates noise.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. the design of the dead steam recovery device can recover the gas generated by the medium-pressure deaerator, thereby preventing the waste of heat and avoiding the pollution to the environment.
2. Through the exhaust steam of turbine unit oil blanket cooler bin cooling middling pressure oxygen-eliminating device, not only can make the heat whole retrieve, and can the noise elimination, the switch of exhaust steam conveyer pipe can be controlled to first stop valve, make in the gaseous exhaust steam recovery unit that gets into in the middling pressure oxygen-eliminating device, the switch of low pressure gas-supply pipe can be controlled to the second stop valve, carry the liquid after the condensation to the low pressure oxygen-eliminating device in, the switch of outlet duct can be controlled to the third stop valve, be convenient for with the gaseous discharge after the condensation, reduce the pollution to the environment.
3. The design through the condensation dish has not only increased the area of contact between exhaust steam and the cooling water, improve heat exchange efficiency, and can make the liquid after the condensation flow downwards along the sloping face of condensation dish, be convenient for unified collection processing, the circulation of cooling water between two upper and lower condensation dishes can be realized to the cooling water linking pipe, cooling water interface and cooling water play water interface are convenient for communicate with turbine unit oil blanket cooler bin, the fog that the fog catching device can produce high-temperature steam catches, make it form the liquid drop, be convenient for collect in unison.
4. The condensing pan that the slope set up can make the liquid of formation flow downwards fast, and the evenly distributed of condensing pan is convenient for in the design of this contained angle has prolonged the dwell time of exhaust steam in the barrel simultaneously, further improves the heat transfer effect.
5. And a condensate flow guide groove is formed in the side surface of the outer circumference of the tray body and close to one side of the air vent, and condensed liquid flows downwards through the condensate flow guide groove, so that the air vent cannot be blocked.
6. The steam recovery processing method has simple steps and strong practicability, not only improves the heat exchange efficiency, but also reduces the emission of harmful gases and eliminates noise.
Description of the drawings:
the invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of the exhaust steam recovery in the exhaust steam recovery device and method of the oxygen reduction device according to the invention;
FIG. 2 is a schematic view of the construction of the exhaust steam recovery apparatus according to the present invention;
FIG. 3 is a schematic structural view of a condensation plate according to the present invention;
fig. 4 is a schematic structural view of the mist trap of the present invention.
In the figure: 1-medium pressure deaerator; 2-a low-pressure deaerator; 3-a dead steam recovery device; 4-oil seal cooling box of steam turbine set; 5-medium pressure exhaust pipe; 6-medium pressure exhaust valve; 7-exhaust steam conveying pipe; 8-a first stop valve; 9-low pressure gas pipe; 10-a second stop valve; 11-low pressure exhaust pipe; 12-low pressure exhaust valve; 13-an air outlet pipe; 14-a third stop valve; 15-cooling water input pipe; 16-a cooling water output pipe; 17-a cylinder body; 18-an air intake interface; 19-liquid outlet interface; 20-an air outlet interface; 21-cooling water inlet interface; 22-cooling water outlet interface; 23-a condensation tray; 24-a cooling water connection pipe; 25-a tray body; 26-water inlet and outlet interfaces; 27-a vent; 28-condensate guiding gutter; 29-a box body; 30-a mist catching cavity; 31-mist catching net.
Detailed Description
As shown in fig. 1 to 4, the exhaust steam recovery device of the intermediate-pressure deaerator comprises an intermediate-pressure deaerator 1 and a low-pressure deaerator 2, and further comprises an exhaust steam recovery device 3 and a steam turbine unit oil seal cooling box 4, wherein the intermediate-pressure deaerator 1 is connected with the exhaust steam recovery device 3 through an exhaust steam conveying pipe 7, a first stop valve 8 is arranged on the exhaust steam conveying pipe 7, an intermediate-pressure exhaust pipe 5 is arranged at the top end of the intermediate-pressure deaerator 1, an intermediate-pressure exhaust valve 6 is arranged on the intermediate-pressure exhaust pipe 5, and the intermediate-pressure exhaust pipe 5 can be controlled to be opened and closed through the intermediate-pressure exhaust valve 6, so that exhaust steam can be controlled conveniently, and the utilization efficiency.
The exhaust steam recovery device 3 is connected with the low-pressure deaerator 2 through a low-pressure gas pipe 9, a second stop valve 10 is arranged on the low-pressure gas pipe 9, the steam turbine unit oil seal cooling box 4 is connected with the exhaust steam recovery device 3 through a cooling water input pipe 15 and a cooling water output pipe 16, an air outlet pipe 13 is connected on the exhaust steam recovery device 3, a third stop valve 14 is arranged on the air outlet pipe 13, the exhaust steam recovery device 3 comprises a cylinder body 17, condensing discs 23 are arranged in the cylinder body 17 from top to bottom, the upper condensing disc 23 and the lower condensing disc 23 are connected through a cooling water connecting pipe 24, a cooling water inlet port 21 is connected on the upper condensing disc 23, the cooling water inlet port 21 is matched with the cooling water input pipe 15, a cooling water outlet port 22 is connected on the lower condensing disc 23, the cooling water outlet port 22 is matched with the cooling water output pipe 16, a mist catching device is arranged at the top, the mist catching device is connected with an air outlet interface 20, the air outlet interface 20 is matched with an air outlet pipe 13, the side surface and the bottom of the barrel body 17 are respectively provided with an air inlet interface 18 and an air outlet interface 19, the air inlet interface 18 is matched with the exhaust steam conveying pipe 7, the air outlet interface 19 is matched with the low-pressure air conveying pipe 9, the contact area between the exhaust steam and cooling water is increased through the design of the condensing disc 23, the heat exchange efficiency is improved, condensed liquid can flow downwards along the inclined surface of the condensing disc 23, uniform collection and treatment are facilitated, the cooling water connecting pipe 24 can realize the circulation of cooling water between the upper condensing disc 23 and the lower condensing disc 23, the cooling water inlet interface 21 and the cooling water outlet interface 22 are conveniently communicated with the oil seal cooling box 4 of the turboset, the mist catching device can catch mist generated by high-temperature steam, liquid drops are formed, and uniform collection is facilitated.
The inclined setting of condensation dish 23, the contained angle of condensation dish 23 and horizontal direction is a, and the scope of contained angle an is 30 ~ 45, and the condensation dish 23 that the slope set up can make the liquid of formation flow downwards fast, and the evenly distributed of condensation dish 23 is convenient for in the design of this contained angle has prolonged the dwell time of exhaust steam in barrel 17 simultaneously, further improves heat transfer effect.
The condensation plate 23 comprises a plate body 25, water inlet and outlet ports 26 are respectively arranged on the top surface and the bottom surface of the plate body 25, a water storage cavity is arranged inside the plate body 25, the water inlet and outlet ports 26 are communicated with the water storage cavity, the water inlet and outlet ports 26 are convenient for the continuous injection of cooling water into the water storage cavity, and the heat exchange efficiency of exhaust steam is improved. The tray body 25 is provided with air vents 27, the air vents 27 penetrate through the upper surface and the lower surface of the tray body 25, and the exhaust steam can flow upwards along the side surface of the tray body 25 and rise through the air vents. A condensate guide groove 28 is formed in one side, close to the air vent 27, of the outer circumferential side surface of the tray body 25, and condensed liquid flows downwards through the condensate guide groove 28 without blocking the air vent 27.
The top end of the low-pressure deaerator 2 is provided with a low-pressure exhaust pipe 11, the low-pressure exhaust pipe 11 is provided with a low-pressure exhaust valve 12, the low-pressure exhaust pipe 12 can control the opening and closing of the low-pressure exhaust pipe 11, so that the pressure in the low-pressure deaerator 2 is controlled, the mist catching device comprises a box body 29, a mist catching cavity 30 is arranged in the box body 29, a mist catching net 31 is horizontally arranged in the mist catching cavity 30, the top end of the mist catching cavity 30 is communicated with the air outlet port 20, droplets are formed through the mist catching net 31 in the steam rising process and then are convenient to collect, and the final gas is output through; can carry out recovery processing to the gas that middling pressure oxygen-eliminating device 1 produced through exhaust steam recovery unit 3's design, prevent to cause thermal waste, avoid causing the pollution to the environment simultaneously, exhaust steam through turbine unit oil blanket cooler bin 4 cooling middling pressure oxygen-eliminating device 1, not only can make the heat whole retrieve, and can the noise elimination, the switch of exhaust steam conveyer pipe 7 can be controlled to first stop valve 8, make the gas in the middling pressure oxygen-eliminating device 1 get into in exhaust steam recovery unit 3, the switch of low pressure gas-supply pipe 9 can be controlled to second stop valve 10, carry the liquid after the condensation to low pressure oxygen-eliminating device 2 in, the switch of outlet duct 13 can be controlled to third stop valve 14, be convenient for discharge the gas after the condensation, reduce the pollution to the environment.
The method for using the dead steam recovery device of the medium-pressure deaerator comprises the following steps:
1) medium and low pressure deaerator processing
a. Firstly, selecting a medium-pressure deaerator 1 and a low-pressure deaerator 2 with proper sizes according to design requirements, and polishing the inner and outer surfaces of shells of the medium-pressure deaerator 1 and the low-pressure deaerator 2;
b. then installing steam-water separators in the shell respectively, fixedly connecting the steam-water separators in the shell, installing a rotary membrane group on one side of the steam-water separators, wherein the rotary membrane group consists of a water chamber, a steam chamber, a rotary membrane pipe, a condensed water connecting pipe, a make-up water connecting pipe and a primary steam inlet connecting pipe;
c. then a water spraying grate is arranged in the shell and is made of angle-shaped steel which is arranged in a staggered mode up and down, the supplied water which is deoxidized by a membrane rotating group is subjected to secondary distribution, and the supplied water falls on a liquid-steam net arranged below the water spraying grate in a uniform rain-spraying mode;
d. a heat storage filler liquid-vapor net is arranged along the lower part of the water spraying grate, the liquid-vapor net consists of flat steel belts and a cylinder body 17 which are arranged at intervals, a stainless steel wire net is arranged in the liquid-vapor net, feed water is fully contacted with secondary steam at the position, the water is heated to the saturation temperature, and deep deoxidization is carried out;
2) processing of exhaust steam recovery device
a. Firstly, determining the size of the exhaust steam recovery device 3 according to design requirements, manufacturing a corresponding cylinder 17, and polishing the inner surface and the outer surface of the cylinder 17 to meet the requirement of actual exhaust steam recovery;
b. then the size of the condensation disc 23 is determined according to the size of the cylinder 17, the required disc bodies 25 are formed by casting, a water storage cavity is formed in each disc body 25, water inlet and outlet ports 26 are respectively installed along the top surface and the bottom surface of the disc body 25, the water inlet and outlet ports 26 are communicated with the water storage cavity, air vents 27 are formed at set positions on the disc body 25, the air vents 27 penetrate through the top surface and the bottom surface of the disc body 25, condensate flow guide grooves 28 are formed along one side, close to the air vents 27, of the outer circumferential side surface of the disc body 25 at equal intervals, cooling water flows in the water storage cavity, the contact area between the cooling water and exhaust steam is increased, the heat exchange effect is improved, meanwhile, the exhaust steam can flow upwards along the air vents 27, and formed liquid drops flow downwards along the top surface and the condensate;
c. then, the processed condensation discs 23 are sequentially arranged on the inner side surface of the cylinder body 17 in an inclined manner from top to bottom, so that an included angle of 30-45 degrees is formed between each condensation disc 23 and the horizontal direction, the two adjacent condensation discs 23 are fixedly connected through a cooling water connecting pipe 24 and are well sealed, a water inlet/outlet interface 26 on the upper condensation disc 23 is hermetically connected with a cooling water inlet interface 21, a water inlet/outlet interface 26 on the lower condensation disc 23 is hermetically connected with a cooling water outlet interface 22, an air inlet interface 18 and a liquid outlet interface 19 are respectively arranged along the side surface and the bottom of the cylinder body 17, and the condensation discs 23 are obliquely distributed up and down, so that the retention time of exhaust steam in the cylinder body 17 is increased, the contact area between the exhaust steam and the condensation discs 23 is increased, the heat exchange efficiency is improved, and the condensate is convenient to collect;
d. finally, a box body 29 is installed on the top surface of the cylinder body 17, a mist catching cavity 30 is formed in the box body 29, the mist catching cavity 30 penetrates through the bottom surface of the box body 29, a mist catching net 31 is horizontally installed along the inner side surface of the mist catching cavity 30, an air outlet port 20 is installed on the top surface of the mist catching cavity 30, the mist catching net 31 can atomize and catch rising hot steam, and finally discharged gas is reduced in pollution to the environment;
3) pipe connection installation
a. After the medium-pressure deaerator 1, the low-pressure deaerator 2 and the exhaust steam recovery device 3 are installed, firstly, a medium-pressure exhaust pipe 5 is connected to the top surface of the medium-pressure deaerator 1, a medium-pressure exhaust valve 6 is installed on the medium-pressure exhaust pipe 5, then, the medium-pressure exhaust pipe 5 is connected with the exhaust steam recovery device 3 through an exhaust steam conveying pipe 7, and a first stop valve 8 is installed on the exhaust steam conveying pipe 7;
b. then the exhaust steam recovery device 3 is connected with the low-pressure deaerator 2 through a low-pressure gas transmission pipe 9, a second stop valve 10 is installed on the low-pressure gas transmission pipe 9, a low-pressure exhaust pipe 11 is installed along the top surface of the low-pressure deaerator 2, and a low-pressure exhaust valve 12 is installed on the low-pressure exhaust pipe 11;
c. finally, an air outlet pipe 13 is connected to the dead steam recovery device 3, the air outlet pipe 13 and an air outlet connector 20 are sealed, and a third stop valve 14 is installed on the air outlet pipe 13;
4) cooling device mounting
Firstly, selecting a proper-size steam turbine unit oil seal cooling box 4 according to design requirements, connecting the steam turbine unit oil seal cooling box 4 with a dead steam recovery device 3 through a cooling water input pipe 15 and a cooling water output pipe 16, and sealing the connection part;
5) recovery test run of exhaust steam
The water yield of cooling water is controlled through the steam turbine unit oil seal cooling box 4, the cooling water stably enters the exhaust steam recovery device 3, the cooling water flows back to the steam turbine unit oil seal cooling box 4 after heat exchange, the medium-pressure exhaust valve 6 on the medium-pressure exhaust pipe 5 is closed, gas in the medium-pressure deaerator 1 enters the exhaust steam recovery device 3 through the exhaust steam conveying pipe 7, after the heat exchange and pressure reduction, the non-condensable gas is discharged from the gas outlet pipe 13, the condensed liquid is input into the low-pressure deaerator 2 through the low-pressure gas conveying pipe 9, the heat is completely recovered while the noise is eliminated, the operation is convenient and reliable, and the economic benefit is improved.
The exhaust steam recovery processing method has simple steps and strong practicability, not only improves the heat exchange efficiency, but also reduces the emission of harmful gas and eliminates noise.
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple variations, equivalent substitutions or modifications based on the present invention to achieve substantially the same technical effects are within the scope of the present invention.
Claims (7)
1. The method of the dead steam recovery device of the medium-pressure deaerator comprises the medium-pressure deaerator and the low-pressure deaerator, and is characterized in that: the steam turbine unit oil seal cooling box is connected with the exhaust steam recovery device through a cooling water input pipe and a cooling water output pipe, the exhaust steam recovery device is connected with an air outlet pipe, and the air outlet pipe is provided with a third stop valve; the exhaust steam recovery device comprises a cylinder body, wherein a condensation plate is arranged in the cylinder body from top to bottom, the upper condensation plate and the lower condensation plate are connected through a cooling water connecting pipe, a cooling water inlet port is connected to the upper condensation plate, the cooling water inlet port is matched with the cooling water input pipe, a cooling water outlet port is connected to the lower condensation plate, the cooling water outlet port is matched with the cooling water output pipe, a mist catching device is arranged at the top of the cylinder body, a gas outlet port is connected to the mist catching device, the gas outlet port is matched with the gas outlet pipe, a gas inlet port and a liquid outlet port are respectively arranged on the side surface and the bottom of the cylinder body, the gas inlet port is matched with the exhaust steam conveying pipe, and the liquid outlet port is matched with the low-pressure gas conveying pipe; the mist catching device comprises a box body, a mist catching cavity is formed in the box body, a mist catching net is horizontally arranged in the mist catching cavity, the top end of the mist catching cavity is communicated with the air outlet port, and the mist catching device comprises the following steps:
1) medium and low pressure deaerator processing
a. Firstly, selecting a medium-pressure deaerator and a low-pressure deaerator with proper sizes according to design requirements, and polishing the inner and outer surfaces of shells of the medium-pressure deaerator and the low-pressure deaerator;
b. then respectively installing steam-water separators in the shell, fixedly connecting the steam-water separators in the shell, and installing a rotating membrane group on one side of each steam-water separator, wherein each rotating membrane group consists of a water chamber, a steam chamber, a rotating membrane pipe, a condensed water connecting pipe, a make-up water connecting pipe and a primary steam inlet connecting pipe;
c. then, a water spraying grate is arranged in the shell and is made of angle-shaped steel bars which are staggered up and down;
d. a heat storage filler liquid-vapor net is arranged along the lower part of the water spraying grate, and the liquid-vapor net consists of flat steel belts and a cylinder body which are mutually spaced, and a stainless steel wire net is arranged in the liquid-vapor net;
2) processing of exhaust steam recovery device
a. Firstly, determining the size of the dead steam recovery device according to design requirements, manufacturing a corresponding cylinder body, and polishing the inner surface and the outer surface of the cylinder body;
b. then determining the size of the condensation plate according to the size of the cylinder, forming required plate bodies by pouring, arranging a water storage cavity in each plate body, respectively installing a water inlet and outlet port along the top surface and the bottom surface of each plate body, communicating the water inlet and outlet ports with the water storage cavity, arranging a vent hole along a set position on each plate body, enabling the vent hole to penetrate through the top surface and the bottom surface of each plate body, and arranging condensate diversion trenches at equal intervals along one side, close to the vent hole, of the outer circumferential side surface of each plate body;
c. sequentially mounting the processed condensation discs on the inner side surface of the cylinder body in an inclined manner from top to bottom, enabling each condensation disc to form an included angle of 30-45 degrees with the horizontal direction, fixedly connecting the two condensation discs which are adjacent from top to bottom through a cooling water connecting pipe, sealing, hermetically connecting a water inlet/outlet interface on the upper condensation disc with a cooling water inlet interface, hermetically connecting a water inlet/outlet interface on the lower condensation disc with a cooling water outlet interface, and respectively mounting an air inlet interface and a liquid outlet interface along the side surface and the bottom of the cylinder body;
d. finally, a box body is arranged on the top surface of the barrel body, a mist catching cavity is formed in the box body, the mist catching cavity penetrates through the bottom surface of the box body, a mist catching net is horizontally arranged along the inner side surface of the mist catching cavity, and an air outlet port is arranged on the top surface of the mist catching cavity;
3) pipe connection installation
a. After the medium-pressure deaerator, the low-pressure deaerator and the exhaust steam recovery device are installed, a medium-pressure exhaust pipe is connected to the top surface of the medium-pressure deaerator, a medium-pressure exhaust valve is installed on the medium-pressure exhaust pipe, the medium-pressure exhaust pipe is connected with the exhaust steam recovery device through an exhaust steam conveying pipe, and a first stop valve is installed on the exhaust steam conveying pipe;
b. then connecting the exhaust steam recovery device with a low-pressure deaerator through a low-pressure gas conveying pipe, installing a second stop valve on the low-pressure gas conveying pipe, installing a low-pressure exhaust pipe along the top surface of the low-pressure deaerator, and installing a low-pressure exhaust valve on the low-pressure exhaust pipe;
c. finally, an air outlet pipe is connected to the dead steam recovery device, the air outlet pipe and an air outlet interface are sealed, and a third stop valve is installed on the air outlet pipe;
4) cooling device mounting
Firstly, selecting a proper-size steam turbine unit oil seal cooling box according to design requirements, connecting the steam turbine unit oil seal cooling box with a dead steam recovery device through a cooling water input pipe and a cooling water output pipe, and sealing the connection part;
5) recovery test run of exhaust steam
The water yield of cooling water is controlled through the steam turbine unit oil seal cooling box, the cooling water stably enters the exhaust steam recovery device, flows back to the steam turbine unit oil seal cooling box after heat exchange, a medium-pressure exhaust valve on a medium-pressure exhaust pipe is closed, gas in the medium-pressure deaerator enters the exhaust steam recovery device through an exhaust steam conveying pipe, after heat exchange and pressure reduction, non-condensable gas is discharged from an air outlet pipe, and condensed liquid is input into the low-pressure deaerator through a low-pressure gas conveying pipe.
2. The method of the dead steam recovery device of the medium-pressure deaerator of claim 1, characterized in that: the top end of the medium-pressure deaerator is provided with a medium-pressure exhaust pipe, and a medium-pressure exhaust valve is arranged on the medium-pressure exhaust pipe.
3. The method of the dead steam recovery device of the medium-pressure deaerator of claim 1, characterized in that: the top of low pressure oxygen-eliminating device is provided with the low pressure blast pipe, be provided with low pressure discharge valve on the low pressure blast pipe.
4. The method of the dead steam recovery device of the medium-pressure deaerator of claim 1, characterized in that: the condensation plate is obliquely arranged, the included angle between the condensation plate and the horizontal direction is a, and the range of the included angle a is 30-45 degrees.
5. The method of the dead steam recovery device of the medium-pressure deaerator of claim 1, characterized in that: the condensation dish includes the disk body, be provided with business turn over water interface on the top surface of disk body and the bottom surface respectively, the inside of disk body is provided with the water storage chamber, business turn over water interface with the water storage chamber intercommunication.
6. The method for recovering the dead steam of the medium-pressure deaerator as claimed in claim 5, is characterized in that: be provided with the blow vent on the disk body, the blow vent runs through the upper and lower surface of disk body.
7. The method of claim 6, wherein the method comprises the following steps: and a condensate flow guide groove is formed in the outer circumferential side surface of the disc body and is close to one side of the air vent.
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