CN214660404U - Waste heat power generation system of ash water true-flashing negative-pressure wet steam turbine of coal gasification device - Google Patents
Waste heat power generation system of ash water true-flashing negative-pressure wet steam turbine of coal gasification device Download PDFInfo
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Abstract
The utility model provides a coal gasification device grey water true flashing negative pressure wet steam turbine waste heat power generation system, include: the system comprises a vacuum flash tank, a steam dewatering and ash removing device, a dustproof and anticorrosion safety device of a steam turbine, a turbine anticorrosion sealing device, a wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine, a high-vacuum condenser, a generator and a high-vacuum device; the vacuum flash tank is connected with a steam dewatering and ash removing device, a dustproof and anticorrosive safety device of the steam turbine, a wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine, a high vacuum condenser and a high vacuum device in sequence; the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine is sequentially connected with the generator and the generator grid-connected device. The utility model discloses in the low temperature grey water treatment process to coal gasification production, realize the effective recycle of latent heat of vaporization among the true negative pressure wet steam that dodges, reduce thermal pollution, convert the latent heat of vaporization among the true negative pressure wet steam that dodges into effective electric energy, reduce the consumption of enterprise's station service power, bring considerable economic benefits for the enterprise.
Description
Technical Field
The utility model relates to an energy saving and emission reduction technical field especially relates to a coal gasification equipment grey water true flash distillation steam turbine waste heat recovery power generation system.
Background
At present, domestic coal chemical enterprises are developing towards large-scale and large-scale. According to the demand of eliminating the backward productivity, all the existing large-scale coal chemical enterprises eliminate the fixed bed gas making process with high energy consumption and adopt the high-pressure coal gasification technology with high efficiency and low energy consumption.
In the current process flow of the high-pressure coal gasification device adopted by large-scale coal chemical enterprises, in order to cool the gasification furnace and purify high-temperature synthesis gas containing a large amount of dust impurities sent out from the gasification furnace, a large amount of high-temperature hot water enters a high-pressure flash tank from the gasification furnace and a washing tower.
The ash water entering the high-pressure flash tank from the gasification furnace and the washing tower has high temperature and high flow; the water temperature is generally 200-245 ℃, the flow rate of water in a single set of device is 170-450T/H, and the grey water contains combustible gas, corrosive gas and a large amount of dust.
According to the control of environmental pollution in China at present, a large amount of high-temperature grey water of coal chemical enterprises is not allowed to be emptied and can only be treated. At present, sewage containing a large amount of dust and other harmful impurities can be subjected to flash evaporation for multiple times, and finally, dosing treatment is carried out under low-temperature drainage water after vacuum flash evaporation. In order to reduce the temperature, the high-pressure coal gasification device usually adopts a two-stage flash evaporation or three-stage flash evaporation process to gradually reduce the temperature of the high-temperature grey water. Under normal conditions, most of steam in high-flash steam and low-flash steam can be recycled, but the real flash steam has the characteristics of low temperature (less than 95 ℃) and low pressure (negative pressure), corrosive impurities and a large amount of dust are also contained in the real flash steam, so that the real flash steam cannot be utilized at present, and only can be cooled by circulating water through a cooler and heat is discharged. Because the true flash steam contains a large amount of latent heat of vaporization, the energy loss is great, and simultaneously, the great thermal environmental pollution is caused
SUMMERY OF THE UTILITY MODEL
The utility model provides a coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system for solve present in coal gasification grey water treatment, be difficult to carry out effective recycle to the latent heat of vaporization of true flash steam, easily cause thermal environment pollution's problem.
The utility model provides a coal gasification device grey water true flashing negative pressure wet steam turbine waste heat power generation system, include: the system comprises a vacuum flash tank, a steam water and ash removal device, a dustproof and anticorrosion safety device of a steam turbine, a wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine, a generator grid-connected device, a high-vacuum condenser and a high-vacuum device; the vacuum flash tank is sequentially connected with the steam dewatering and ash removing device, the turbine dustproof and anticorrosive safety device, the wear-resistant anticorrosive anti-blocking negative-pressure wet steam turbine, the high-vacuum condenser and the high-vacuum device; the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine is sequentially connected with the generator and the generator grid-connected device; the vacuum flash tank is used for carrying out vacuum flash evaporation on grey water and outputting dust-containing negative pressure wet steam; the steam water and ash removal device is used for performing water and ash removal treatment on dust-containing negative pressure wet steam; the dustproof and anticorrosive safety device of the steam turbine is used for blocking and protecting steam entering the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine; the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine is used for receiving the negative pressure steam treated by the steam water and ash removal device and converting heat energy in the negative pressure steam into mechanical energy to drive the generator to generate electricity, and the generator grid-connected device is used for merging the electricity generated by the generator into an enterprise power system; and the high-vacuum condenser absorbs the exhaust steam from the wear-resistant, corrosion-resistant and anti-blocking negative-pressure wet steam turbine under the action of vacuumizing of the high-vacuum device, and cools the exhaust steam into condensed water.
According to the utility model provides a pair of coal gasification device grey water true flashing negative pressure wet steam turbine waste heat power generation system still includes: a condensate pump and a grey water tank; the vacuum flash tank and the steam water and ash removing device are respectively communicated with the grey water tank; one end of the condensate pump is communicated with the high-vacuum condenser, and the other end of the condensate pump is communicated with the grey water tank; and the condensate pump is used for discharging the condensate generated by the high-vacuum condenser to the ash pond.
According to the waste heat power generation system of the coal gasification device ash water true flash negative pressure wet steam turbine, the steam water and dust removing device comprises a box body and a water and dust removing component; the water and dust removing component is arranged in the box body and is used for capturing liquid drops and dust in dust-containing negative pressure wet steam; the box wall of the box body is provided with a steam inlet, a steam outlet, a flushing port and a water outlet; carrying out anticorrosive treatment on the inner wall of the box body; the steam inlet is communicated with the vacuum flash tank, and the steam outlet is sequentially communicated with the dustproof and anticorrosive safety device of the steam turbine and the wear-resistant and anticorrosive anti-blocking negative pressure wet steam turbine; the flushing port is used for being communicated with an enterprise water supply system; the water outlet is communicated with the grey water tank.
According to the utility model provides a pair of coal gasification device grey water true flashing negative pressure wet steam turbine waste heat power generation system still includes: a dustproof and anticorrosive safety device of the steam turbine; one end of the turbine dustproof and anticorrosive safety device is communicated with the steam water and ash removal device, and the other end of the turbine dustproof and anticorrosive safety device is communicated with the wear-resistant anticorrosive anti-blocking negative-pressure wet steam turbine; the dustproof and anticorrosive safety device of the steam turbine has a first state and a second state; under the condition that the dustproof and anticorrosive safety device of the steam turbine is in the first state, the steam water and ash removing device is communicated with the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine; under the condition that the dustproof and anticorrosive safety device of the steam turbine is in the second state, the steam water and ash removing device is blocked with the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine; the steam turbine anti-corrosion and dustproof steam safety device is used for receiving various safety commands and responding to the safety commands to realize switching between the first state and the second state. The steam turbine anti-corrosion dustproof steam safety device can also block the steam source entering the wear-resistant anti-corrosion anti-blocking negative pressure wet steam turbine at any time according to requirements, so that the wear-resistant anti-corrosion anti-blocking negative pressure wet steam turbine is stopped to protect the whole set of device.
According to the utility model provides a pair of coal gasification device grey water true flashing negative pressure wet steam turbine waste heat power generation system still includes: a steam turbine cleaning steam cleaning system; the clean steam source is sequentially connected with the turbine anticorrosion sealing device and the wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine; the clean steam source provides a clean source and guarantee for the self requirement of the anti-corrosion sealing device of the steam turbine during working and the regular cleaning of the wear-resistant anti-corrosion anti-blocking negative pressure wet steam turbine.
According to the utility model provides a pair of coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system, include: a turbine anti-corrosion sealing device; the steam turbine anti-corrosion sealing device is provided with two steam turbine anti-corrosion sealing devices, one end of each steam turbine anti-corrosion sealing device is communicated with the clean steam source, the other end of each steam turbine anti-corrosion sealing device is located at two shaft ends of the wear-resistant anti-corrosion anti-blocking negative pressure wet steam turbine respectively, and the shaft end portions of the wear-resistant anti-corrosion anti-blocking negative pressure wet steam turbine are dynamically sealed.
According to the coal gasification device grey water true flashing negative pressure wet steam turbine waste heat power generation system provided by the utility model, the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine is a condensing multistage steam turbine, all parts in the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine are subjected to wear-resistant and heavy corrosion-resistant treatment, so that all parts in the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine are wear-resistant and anti-corrosion parts; the blades of the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine are non-blocking blades. The operation of the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine strictly executes special operation regulations to ensure the reliability and safety of the operation of the turbine.
According to the utility model provides a pair of coal gasification device grey water true flashing negative pressure wet steam turbine waste heat power generation system still includes: a high vacuum system; the high vacuum system consists of the high vacuum condenser and the high vacuum device; the steam inlet end of the high-vacuum condenser is connected with the steam exhaust end of the wear-resistant, corrosion-resistant and anti-blocking negative-pressure wet steam turbine, and the air suction end of the high-vacuum condenser is connected with the high-vacuum device; the high-vacuum device is used for vacuumizing the high-vacuum condenser so as to form a pressure difference between the air inlet side and the air outlet side of the wear-resistant, corrosion-resistant and anti-blocking negative-pressure wet steam turbine, and the wear-resistant, corrosion-resistant and anti-blocking negative-pressure wet steam turbine works under the action of the pressure difference. The shell of the high vacuum condenser is an anti-corrosion shell, the internal components of the high vacuum condenser are anti-corrosion components, and a shell side cleaning device is also arranged to prevent the shell side from being blocked due to dust in steam; a water collecting well for storing condensed water generated by the high vacuum condenser is arranged outside the high vacuum condenser, and the water collecting well has liquid level adjusting and displaying functions; the high vacuum device is any one of a water ring vacuum pump, a water jet air extractor, a steam jet air extractor and a Roots vacuum pump, or the high vacuum device is a combined device formed by any two of the water ring vacuum pump, the water jet air extractor, the steam jet air extractor and the Roots vacuum pump; the high vacuum device has the functions of corrosion resistance and wear resistance.
According to the utility model, the coal gasification device ash water true flash negative pressure wet steam turbine waste heat power generation system also comprises a condensed water system; the condensate system comprises a condensate pump and an ash pond; an inlet of the condensate pump is connected with the high-vacuum condenser, and an outlet of the condensate pump is connected with the grey water tank; and the condensed water in the high-vacuum condenser after being cooled by the circulating water is pumped to the ash pond through the condensed water pump.
According to the utility model provides a pair of coal gasification device grey water true flashing negative pressure wet steam turbine waste heat power generation system, wear-resisting anticorrosive anti-blocking negative pressure wet steam turbine is used for dragging generator power generation, wear-resisting anticorrosive anti-blocking negative pressure wet steam turbine with the generator grid-connected device connects gradually, the generator both can be synchronous generator, also can be asynchronous generator, the electric energy that the generator sent passes through the generator grid-connected device directly inserts the factory power system of enterprise.
When all the devices work in an explosion-proof environment, explosion-proof devices which are adaptive to the on-site explosion-proof grade are adopted.
Therefore, the utility model discloses in coal gasification grey water treatment, realized the effective recycle to the latent heat of vaporization of real flash distillation vapour, both realized energy saving and emission reduction, reduced the consumption of enterprise to the electric energy, still can avoid causing thermal environment pollution.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art process system for treating grey water;
FIG. 2 is a schematic structural diagram of a coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system provided by the present invention;
reference numerals:
100. a vacuum flash evaporation device; 200. a true flash steam cooler; 300. a vacuum pump; 400. A sedimentation tank; 1. a vacuum flash tank; 2. a steam dewatering and ash removing device; 3. a dustproof and anticorrosive safety device of the steam turbine; 4. a turbine anti-corrosion sealing device; 5. the negative pressure wet steam turbine is wear-resistant, corrosion-resistant and anti-blocking; 6. a high vacuum condenser; 7. a generator; 8. a high vacuum device; 9. a condensate pump; 10. a grey water pool; 11. a generator grid connection device; 12. the steam source is cleaned.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, when treating grey water produced in a high pressure coal gasification process, a conventional process system includes a settling tank 400, a vacuum flash evaporation apparatus 100, a vacuum flash evaporation steam cooler 200, and a vacuum flash vacuum pump 300; the vacuum flash apparatus 100 is used for containing the grey water with a low temperature from the coal gasification apparatus after primary or secondary flash evaporation, and the vacuum flash apparatus 100 may be a vacuum flash tank known in the art. The vacuum degree of the vacuum flash apparatus 100 is achieved by the vacuum flash pump 300. Under the continuous vacuum pumping action of the vacuum flash vacuum pump 300, the negative pressure wet flash steam containing a large amount of dust flashed by the vacuum flash evaporation device 100 is input into the vacuum flash steam cooler 200, the vacuum flash steam cooler 200 utilizes circulating cooling water to cool the negative pressure wet steam containing a large amount of dust, and the cooled condensed water is discharged into the sedimentation tank 400.
However, in practical operation, it is found that, not only is it difficult to effectively purify the dust in the negative pressure wet steam flashed by the vacuum flash apparatus 100, but also the dust entrained in the negative pressure wet steam can block the true flash steam cooler 200, which affects the cooling effect of the true flash steam cooler 200, and at the same time, the waste heat rich in the grey water is not effectively utilized.
In order to solve the problem, the utility model provides a coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system.
As shown in fig. 2, the present embodiment provides a coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system, which includes: the system comprises a vacuum flash tank 1, a steam dewatering and ash removing device 2, a turbine dustproof and anticorrosion safety device 3, a turbine anticorrosion sealing device 4, a wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine 5, a high vacuum condenser 6, a generator 7, a high vacuum device 8, a condensate pump 9, an ash water pond 10, a generator grid-connected device 11 and a clean steam source 12.
Further, the vacuum flash tank 1 is sequentially connected with a steam water and ash removal device 2, a turbine dustproof and anticorrosion safety device 3, a wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine 5, a high vacuum condenser 6 and a high vacuum device 8; the high vacuum condenser 6 is connected with a condensate pump 9 and an ash water tank 10 in sequence; the clean steam source 12 is sequentially connected with the turbine anticorrosion sealing device 4 and the wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine 5; the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine 5 is sequentially connected with the generator 7 and the generator grid-connected device 11.
Wherein, the vacuum flash tank 1 carries out vacuum flash evaporation on the grey water and outputs dust-containing negative pressure wet steam; the steam dewatering and ash removing device 2 carries out dewatering and ash removing treatment on the dust-containing negative pressure wet steam; the turbine dustproof and anticorrosive safety device 3 blocks and protects the steam entering the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine 5; the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine 5 receives the negative pressure steam processed by the steam dewatering and ash removing device 2, converts heat energy in the negative pressure steam into mechanical energy to drive the generator 7 to generate electricity, and the generator grid-connected device 11 is used for sending electricity generated by the generator 7 to an enterprise auxiliary power system to achieve the electricity-saving function; the high-vacuum condenser 6 is used for absorbing the exhaust steam from the wear-resistant, corrosion-resistant and anti-blocking negative-pressure wet steam turbine 5 under the action of vacuumizing of the high-vacuum device 8 and cooling the exhaust steam into condensed water.
Specifically, in this embodiment, when the high-temperature grey water produced in the coal gasification process is subjected to the final stage of true flashing treatment, the grey water is flashed through the vacuum flash tank, negative-pressure wet steam containing dust is flashed, the negative-pressure wet steam containing dust is conveyed to the steam water and dust removal device for water removal and dust removal treatment, the negative-pressure wet steam subjected to the water removal and dust removal treatment is conveyed to the wear-resistant corrosion-resistant anti-blocking negative-pressure wet steam turbine to drive the steam turbine to do work, the steam turbine drives the generator to generate electricity, and the electricity is conveyed to the enterprise plant power system through the generator grid-connected device. In the process, the high-vacuum condenser is continuously vacuumized by the high-vacuum device, and the high-vacuum condenser continuously cools the steam discharged by the wear-resistant, corrosion-resistant and anti-blocking negative-pressure steam turbine into condensed water, so that pressure difference is generated on the steam inlet side and the steam outlet side of the wear-resistant, corrosion-resistant and anti-blocking negative-pressure steam turbine, the wear-resistant, corrosion-resistant and anti-blocking negative-pressure steam turbine continuously operates under the action of the pressure difference to do work, and latent heat of vaporization in the negative-pressure wet steam flashed by the vacuum flash tank is converted into effective electric energy which can be utilized by enterprises under the cooperation of a generator and a generator grid-connected device.
Therefore, the system disclosed by the embodiment realizes effective utilization of latent heat of vaporization of true flash steam in the coal gasification grey water treatment, realizes energy conservation and emission reduction, reduces the consumption of electric energy by enterprises, and improves the economic benefit of the enterprises.
It should be noted that the high vacuum apparatus 8 shown in the present embodiment is any one of a water ring vacuum pump, a water jet air extractor, a steam jet air extractor, and a roots vacuum pump, or a combination of any two of the water ring vacuum pump, the water jet air extractor, the steam jet air extractor, and the roots vacuum pump, and is not limited herein.
In the system shown in this embodiment, when each device operates in an explosion-proof environment, each device adopts an explosion-proof device that is adapted to the explosion-proof level on site.
Preferably, the system shown in the embodiment is further provided with a grey water tank 10 and a condensate pump 9; the vacuum flash tank 1 and the steam water and ash removing device 2 are respectively communicated with an ash water tank 10; the inlet end of the condensate pump 9 is communicated with the high vacuum condenser 6, and the outlet end of the condensate pump 9 is communicated with the grey water tank 10. The condensate pump 9 is used to discharge condensate generated by the high vacuum condenser 6 to the grey water tank 10.
Preferably, the system shown in this embodiment is also provided with a turbine cleaning steam source 12. The clean steam source 12 is connected with the turbine anti-corrosion sealing device 4 and the wear-resistant anti-corrosion anti-blocking negative pressure wet steam turbine 5, and provides a clean source and guarantee for the self requirement of the turbine anti-corrosion sealing device 4 and the regular cleaning of the wear-resistant anti-corrosion anti-blocking negative pressure wet steam turbine 5.
In one embodiment, the system of the present embodiment is further provided with a turbine corrosion protection seal 4. The number of the turbine anti-corrosion sealing devices 4 is two, one end of each turbine anti-corrosion sealing device 4 is communicated with the clean steam source 12, the other end of each turbine anti-corrosion sealing device is respectively positioned at two shaft ends of the wear-resistant anti-corrosion anti-blocking negative pressure wet steam turbine 5, and the shaft end parts of the wear-resistant anti-corrosion anti-blocking negative pressure wet steam turbine 5 are dynamically sealed.
In one embodiment, the steam de-watering and ash-removing device 2 shown in the embodiment comprises a box body and a de-watering and dust-removing component, wherein the de-watering and dust-removing component is arranged in the box body and is used for capturing liquid drops and dust in negative pressure saturated flash steam containing dust; the wall of the box body is provided with a steam inlet, a steam outlet, a flushing port and a water outlet; carrying out anticorrosive treatment on the inner wall of the box body; the steam inlet is communicated with the vacuum flash tank 1, and the steam outlet is sequentially communicated with a dustproof and anticorrosion safety device of the steam turbine and a wear-resistant, anticorrosion and anti-blocking negative pressure wet steam turbine; the flushing port is arranged at the top of the box body and is used for being communicated with an enterprise water supply system; the drain is in communication with a greywater reservoir 10.
In the embodiment, water is periodically supplied to the flushing port, the water and dust removing component in the box body can be flushed, the flushed liquid containing a large amount of dust is discharged into the grey water tank 10, and the dust is precipitated by the grey water tank 10.
It should be noted that in this embodiment, a layer of anticorrosive layer may be disposed on the inner wall surface of the box body and the surface of the water and dust removing component, or both the box body and the water and dust removing component may be made of anticorrosive material. Therefore, the steam water and ash removing device 2 can be ensured to have better corrosion resistance.
Preferably, the present embodiment is further provided with a turbine dustproof and anticorrosion security device 3, and the installation structure of the turbine dustproof and anticorrosion security device 3 has an anticorrosion and dustproof function. The turbine dustproof and anticorrosive safety device 3 is arranged between the steam dewatering and ash removing device 2 and the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine 5; the dustproof and anticorrosive safety device 3 of the steam turbine has a first state and a second state; under the condition that the dustproof and anticorrosive safety device 3 of the steam turbine is in a first state, the steam water and ash removing device 2 is communicated with the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine 5; under the condition that the dustproof and anticorrosive safety device 3 of the steam turbine is in the second state, the steam water and ash removing device 2 and the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine 5 are blocked. Here, the turbine dust and corrosion prevention protector 3 may be an electro-hydraulic protector or a pneumatic protector known in the art.
Specifically, the dustproof and anticorrosive protection device 3 for a steam turbine shown in this embodiment is used for receiving protection information or a linkage signal of the steam turbine unit itself, or responding to input information or a linkage signal of a user, so that the operating state of the steam turbine is in a first state and a second state. For example: in the normal working state of the true flashing device, a user can input an operation instruction of the turbine dustproof and anticorrosive safety device 3 when equipment is in a first state, so that the turbine dustproof and anticorrosive safety device 3 is controlled to be in the first state, and the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine 5 is in a running state; in the actual operation process, according to automatic protection and other requirements, a second operation instruction can be input into the dustproof and anticorrosion safety device 3 of the steam turbine to control the dustproof and anticorrosion safety device 3 of the steam turbine to be in a second state, the steam source of flash steam entering the wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine 5 is cut off, the wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine 5 is stopped, and therefore the whole set of device is protected.
The dustproof and anticorrosive safety device 3 of the steam turbine shown in the embodiment is used for receiving various safety commands and responding to the safety commands to realize switching between the first state and the second state.
Further, the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine 5 shown in the present embodiment is a condensing multistage steam turbine, all internal components thereof are subjected to wear-resistant and heavy corrosion-resistant treatment, and the blades thereof are non-blocking type blades. Here, in the present embodiment, the operation procedures are strictly performed on the start, operation, regular cleaning and stop control of the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine 5, so as to ensure the reliability and safety of the operation of the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine 5.
Preferably, the system shown in the embodiment is further provided with a generator grid-connected device 11; the generator grid-connected device 11 is electrically connected with the generator 7 and the enterprise service system; the generator includes a synchronous generator or an asynchronous generator, and is not particularly limited herein.
The generator grid-connected device 11 shown in this embodiment may be a synchronous or asynchronous generator grid-connected device known in the art, and the generator grid-connected device 11 may detect and measure relevant parameters of the generator 7 while providing a switching function, so as to send the electric energy generated by the generator 7 to an enterprise service system.
Preferably, the high vacuum condenser 6 shown in the present embodiment includes: the condenser comprises a condenser shell, a condensing tube bundle, a water collecting well and a shell side cleaning device.
The condenser shell is internally required to be subjected to anticorrosion treatment, the tube bundle is made of corrosive materials, and the condenser tube bundle can be a 304 stainless steel tube, a 316 stainless steel tube or a 316L stainless steel tube, and is not particularly limited herein.
Meanwhile, the condensate level adjustment in the sump of the high vacuum condenser 6 shown in this embodiment adopts a recirculation electric valve adjustment mode and a condensate pump recirculation adjustment mode, which are not specifically limited herein.
Further, the shell-side cleaning device shown in this example is provided on the shell side of the high vacuum condenser 6. In order to prevent the high vacuum condenser 6 from being clogged during a long-term operation, the inner wall surface of the condenser casing may be periodically washed by a casing-side washing device.
The coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system shown in the above embodiment will be specifically described below with reference to specific embodiments.
Example 1
As shown in FIG. 2, a chemical plant adopts a two-stage flash system, the high flash hydrophobic temperature is 158 ℃, and the water flow is 260T/H; after the part of high-temperature grey water enters a vacuum flash tank, negative pressure saturated flash steam with the pressure of-35 KPa is flashed, and the flow of the negative pressure saturated flash steam is about 32T/H. Because the negative pressure saturated flash steam contains a large amount of dust and moisture, the negative pressure saturated flash steam needs to be input into a steam water and dust removing device to carry out water removing and dust removing treatment, then, 1 wear-resistant corrosion-resistant anti-blocking negative pressure saturated steam turbine (hereinafter referred to as a steam turbine) with 1800KW power is fed into the steam turbine dust-proof and anti-corrosion safety device to drive the steam turbine to do work, the steam turbine drives 1 asynchronous generator with 1800KW power to generate electricity, the electric energy generated by the asynchronous generator is connected with a chemical plant service system through a high-voltage switch cabinet, the generated electric energy is sent to a plant power system, and the service power is reduced. Meanwhile, the steam after the work of the steam turbine is sucked into the high-vacuum condenser. Because the anti-corrosion condensing tube bundle of the high vacuum condenser is introduced with the left and right circulating water with the flow rate of 2200T/H, the steam which does work by the steam turbine is cooled by the anti-corrosion condensing tube bundle and is condensed into the condensed water with the flow rate of 32T/H and the temperature of about 41 ℃; finally, the condensed water is discharged to the grey water tank by a condensate pump.
After the project is implemented, 1440 thousands of service power can be saved for enterprises every year, and 720 ten thousand yuan of electric charge expenditure is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. The utility model provides a coal gasification device grey water true flashing negative pressure wet steam turbine waste heat power generation system which characterized in that includes: the system comprises a vacuum flash tank, a steam water and ash removal device, a dustproof and anticorrosion safety device of a steam turbine, a wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine, a generator grid-connected device, a high-vacuum condenser and a high-vacuum device;
the vacuum flash tank, the steam dewatering and ash removing device, the turbine dustproof and anticorrosive safety device, the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine, the high-vacuum condenser and the high-vacuum device are sequentially connected; the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine, the generator and the generator grid-connected device are sequentially connected;
the vacuum flash tank is used for carrying out vacuum flash evaporation on grey water and outputting dust-containing negative pressure wet steam; the steam water and ash removal device is used for performing water and ash removal treatment on dust-containing negative pressure wet steam; the turbine dustproof and anticorrosive safety device is used for blocking and protecting steam entering the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine; the wear-resistant, corrosion-resistant and anti-blocking negative pressure wet steam turbine is used for receiving the negative pressure steam treated by the steam water and ash removal device and converting heat energy in the negative pressure steam into mechanical energy so as to drive the generator to generate electricity; the generator grid-connected device is used for merging the electricity generated by the generator into an enterprise auxiliary power system; and the high-vacuum condenser is used for absorbing the exhaust steam from the wear-resistant, corrosion-resistant and anti-blocking negative-pressure wet steam turbine under the action of vacuumizing of the high-vacuum device and cooling the exhaust steam into condensed water.
2. The coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system of claim 1, further comprising: a condensate pump and a grey water tank;
the vacuum flash tank and the steam water and ash removing device are respectively communicated with the grey water tank; one end of the condensate pump is communicated with the high-vacuum condenser, and the other end of the condensate pump is communicated with the grey water tank; and the condensate pump is used for discharging the condensate generated by the high-vacuum condenser to the ash pond.
3. The coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system according to claim 2, characterized in that:
the steam water and dust removing device comprises a box body and a water and dust removing component; the water and dust removing component is arranged in the box body and is used for capturing liquid drops and dust in dust-containing negative pressure wet steam; the box wall of the box body is provided with a steam inlet, a steam outlet, a flushing port and a water outlet; the inner wall of the box body is subjected to antiseptic treatment; the steam inlet is communicated with the vacuum flash tank, and the steam outlet, the dustproof and anticorrosive safety device of the steam turbine and the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine are communicated; the flushing port is used for being communicated with an enterprise water supply system; the water outlet is communicated with the grey water tank.
4. The coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system according to any one of claims 1 to 3, characterized in that:
the dustproof and anticorrosive safety device of the steam turbine has a first state and a second state; under the condition that the dustproof and anticorrosive safety device of the steam turbine is in the first state, the steam water and ash removing device is communicated with the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine; under the condition that the dustproof and anticorrosive safety device of the steam turbine is in the second state, the steam water and ash removing device is blocked with the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine;
the steam turbine anti-corrosion and dustproof steam safety device is used for receiving various safety commands and responding to the safety commands to realize switching between the first state and the second state.
5. The coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system according to claim 1, characterized in that: further comprising: a steam turbine cleaning steam cleaning system;
the turbine cleaning steam cleaning system includes a cleaning steam source; a turbine anticorrosion sealing device is arranged at the shaft end of the wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine and is used for dynamically sealing the shaft end of the wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine;
the clean steam source is sequentially connected with the turbine anticorrosion sealing device and the wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine, and is used for providing clean steam for the turbine anticorrosion sealing device and providing clean steam for the periodic cleaning of the wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine.
6. The coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system according to claim 5, characterized in that:
the two anticorrosive sealing devices of the steam turbine are respectively arranged at two shaft ends of the wear-resistant anticorrosive anti-blocking negative pressure wet steam turbine; one end of each turbine anticorrosion sealing device is communicated with the clean steam source, and the other end of each turbine anticorrosion sealing device is positioned at the shaft end of the wear-resistant anticorrosion anti-blocking negative pressure wet steam turbine.
7. The coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system according to any one of claims 1 to 3, characterized in that:
the anti-corrosion and anti-blocking wear-resistant negative pressure wet steam turbine is a condensing multistage steam turbine, all parts inside the anti-corrosion and anti-blocking wear-resistant negative pressure wet steam turbine are anti-corrosion wear-resistant parts, and blades of the anti-corrosion and anti-blocking wear-resistant negative pressure wet steam turbine are non-blocking blades.
8. The coal gasification device grey water true flash negative pressure wet steam turbine waste heat power generation system according to any one of claims 1 to 3, characterized in that:
the high vacuum condenser and the high vacuum device form a high vacuum system; the steam inlet end of the high-vacuum condenser is connected with the steam exhaust end of the wear-resistant, corrosion-resistant and anti-blocking negative-pressure wet steam turbine, and the air suction end of the high-vacuum condenser is connected with the high-vacuum device; the shell of the high vacuum condenser is an anti-corrosion shell, the internal components of the high vacuum condenser are anti-corrosion components, and the high vacuum condenser is also provided with a shell side cleaning device; a water collecting well for storing condensed water generated by the high-vacuum condenser is arranged outside the high-vacuum condenser;
the high vacuum device is any one of a water ring vacuum pump, a water jet air extractor, a steam jet air extractor and a Roots vacuum pump, or the high vacuum device is a combined device formed by any two of the water ring vacuum pump, the water jet air extractor, the steam jet air extractor and the Roots vacuum pump.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120972345.9U CN214660404U (en) | 2021-05-08 | 2021-05-08 | Waste heat power generation system of ash water true-flashing negative-pressure wet steam turbine of coal gasification device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120972345.9U CN214660404U (en) | 2021-05-08 | 2021-05-08 | Waste heat power generation system of ash water true-flashing negative-pressure wet steam turbine of coal gasification device |
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| CN214660404U true CN214660404U (en) | 2021-11-09 |
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| CN (1) | CN214660404U (en) |
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