CN111649310A - Waste heat boiler and efficient recovery power generation system using same - Google Patents
Waste heat boiler and efficient recovery power generation system using same Download PDFInfo
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- CN111649310A CN111649310A CN202010503047.5A CN202010503047A CN111649310A CN 111649310 A CN111649310 A CN 111649310A CN 202010503047 A CN202010503047 A CN 202010503047A CN 111649310 A CN111649310 A CN 111649310A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
- F22B1/1892—Systems therefor not provided for in F22B1/1807 - F22B1/1861
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/003—Feed-water heater systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
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Abstract
The invention discloses a waste heat boiler and a high-efficiency recovery power generation system using the same, wherein the waste heat boiler comprises a preheating boiler hearth, the upper part of the preheating boiler hearth is provided with a high-temperature flue gas inlet, and a superheater, an evaporator and an economizer are sequentially arranged in the preheating boiler hearth from top to bottom; a reheater is arranged in parallel with the superheater; the boiler water supply is connected with an economizer, a header on the economizer is connected with a steam pocket, the boiler water supply enters the economizer for heating, and the boiler water supply is pumped into the steam pocket from a water inlet pipe through the header on the economizer; the water in the steam pocket descends in the descending pipe, the descending pipe is connected with the lower header of the evaporator and enters the evaporator for heat exchange, and the upper header of the evaporator is connected with the ascending pipe to the steam-water separator; the saturated steam outlet of the steam drum is connected with the lower header of the superheater, and the outlet of the upper header of the superheater is communicated with the main steam pipeline. The invention overcomes the inherent defects of serious ash deposition and serious abrasion of the traditional waste heat boiler and the limitations of thermal expansibility and adaptability, avoids temperature difference pinch points and realizes safe and efficient recovery of heat energy.
Description
Technical Field
The invention belongs to the technical field of waste heat boilers, and particularly relates to a high-efficiency recycling waste heat boiler power generation system.
Background
A boiler using sensible heat of various exhaust gases and waste heat after incineration as a heat source is called a waste heat boiler, also called a waste heat boiler. In a traditional waste heat boiler power generation system, a waste heat boiler main body is used for heating and pressurizing boiler feed water, a steam turbine is used for realizing steam work, and heat-power conversion is completed to drive a generator to generate power. The common waste heat boiler generally adopts a smoke tube for heat exchange, and the lowest wall surface temperature of a metal heating surface of the common waste heat boiler and the discharge temperature of hot fluid are approximately in a multiple relation. In the design of the waste heat boiler, how to reasonably divide temperature sections is the basis for reasonably arranging the heating surface of the waste heat boiler and utilizing the waste heat to the maximum extent. The state advocates to develop waste heat utilization vigorously, save energy and reduce emission, and plays a positive role in protecting energy and improving the quality of human living environment.
The utility model discloses a notice number CN 101571280A's utility model discloses a waste heat boiler's steam power generation system, it includes sintering waste heat boiler system (2), steam matching system (3), coal gas superheated boiler system (4) and turbo generator unit system (5) that the front track was arranged in proper order to the back track. The steam power generation system of the waste heat boiler recycles the high-temperature flue gas introduced into the waste heat boiler, the generated saturated steam is introduced into the gas boiler to form superheated steam, and the superheated steam is introduced into the steam turbine to efficiently generate power, so that the waste heat of the flue gas is effectively utilized, the energy waste is avoided, and the production cost is reduced.
Notice No. CN 204943433U's utility model discloses an utilize waste heat recovery waste heat to produce exhaust-heat boiler of steam power generation, adopt single drum horizontal formula structure, flue gas import department sets up membrane water wall system, membrane water wall system passes through high temperature over heater and low temperature over heater and links to each other with evaporating pipe bundle, evaporating pipe bundle loops through high-temperature economizer, medium temperature economizer and low temperature economizer link to each other with the exhanst gas outlet, high temperature economizer passes through the drum and links to each other with membrane water wall system, membrane water wall system includes the front diaphragm wall, back diaphragm wall, side diaphragm wall and smoke inlet diaphragm wall, connect an tedge between front diaphragm wall and the back diaphragm wall. The utility model has the characteristics of compact structure, heat recovery efficiency are high, the operation is reliable, energy-concerving and environment-protective, and the leakproofness is good, has thoroughly solved boiler problem of leaking out, has improved boiler steam output greatly, fully retrieves the waste heat, has reduced the power generation cost, has improved economic benefits, and the waste heat recovery that trades such as carbon element, glass kiln, coking can be applied to more than 86% of thermal efficiency utilizes.
Utility model discloses a utility model of No. CN205578050U relates to a waste heat boiler's steam power generation system, its characterized in that: the system comprises a sintering waste heat boiler system (2), a steam matching system (3), a coal gas superheating boiler system (4) and a turbine generator set system (5) which are sequentially arranged from the front to the back. The steam power generation system of the waste heat boiler recycles the high-temperature flue gas introduced into the waste heat boiler, the generated saturated steam is introduced into the gas boiler to form superheated steam, and the superheated steam is introduced into the steam turbine to efficiently generate power, so that the waste heat of the flue gas is effectively utilized, the energy waste is avoided, and the production cost is reduced.
Notice No. CN 208983326U's utility model discloses a subcritical dry quenching exhaust-heat boiler of self deoxidization, including furnace, turn to room, water-cooled wall formula hanging pipe, oxygen-eliminating device and high-pressure boiler section of thick bamboo, feed water heater, low pressure evaporator, high-pressure economizer, high pressure fin pipe evaporimeter, high-pressure light pipe evaporimeter, low temperature over heater, re-heater and high temperature over heater have set gradually in the furnace from bottom to top. Adopt the utility model discloses afterwards, high temperature over heater export superheated steam pressure can reach 17.4 ~ 17.8MPa, and the temperature can reach 571 5 ℃ or less, and generated energy is higher than current high temperature high pressure dry quenching exhaust-heat boiler about 5% during the same flue gas volumn, has saved outer steam of supplying and corollary equipment, reduces the investment and the working costs of whole engineering by a wide margin, and the structure is compacter, takes up an area of still less.
However, in the technical scheme, the temperature section division is unreasonable in the design of the preheating boiler; in the design of the whole preheating boiler power generation system, the system arrangement is unreasonable; thereby affecting the safe and efficient recovery of heat energy.
Disclosure of Invention
The invention aims to provide a high-efficiency recycling waste heat boiler power generation system.
In order to solve the technical problems, the invention adopts the following technical scheme:
a waste heat boiler comprises a preheating boiler furnace, wherein a high-temperature flue gas inlet is formed in the upper portion of the preheating boiler furnace, and a superheater, an evaporator and an economizer are sequentially arranged in the preheating boiler furnace from top to bottom; a reheater is arranged in parallel with the superheater and is positioned at the upper end of the boiler; after entering a hearth of a preheating boiler, the high-temperature flue gas respectively exchanges heat with a superheater, a reheater, an evaporator and an economizer;
the boiler water supply is connected with an economizer, collected at a lower header of the economizer and enters the economizer for heat exchange, an upper header of the economizer is connected with a steam pocket, the boiler water supply enters the economizer for heating, and is pumped into the steam pocket from a water inlet pipe through the upper header of the economizer; a steam drum water outlet is connected with a downcomer, water in a steam drum descends on the downcomer, the downcomer is connected with a lower header of an evaporator and enters the evaporator for heat exchange, and an upper header of the evaporator is connected with an ascending pipe to a steam-water separator; the saturated steam outlet of the steam drum is connected with the lower header of the superheater, and the outlet of the upper header of the superheater is communicated with the main steam pipeline.
And the high-temperature flue gas inlet is connected with the Ender furnace process exhaust.
And a membrane water-cooled wall is arranged at the hearth of the preheating boiler.
An efficient recovery power generation system using a waste heat boiler, comprising the waste heat boiler and further comprising: the system comprises a steam turbine, a generator, a condenser, a steam turbine steam extraction pipeline, a condensate pump, a high-pressure condensate pump, a low-pressure heater, a water feed pump, a high-pressure heater and a soft water heater;
the superheated steam in the main steam pipeline enters a steam turbine to push the steam turbine to do work, and the heat-work conversion is completed to drive a generator to generate electricity;
the steam turbine is connected with a steam turbine reheating steam pipeline, the steam turbine reheating steam pipeline extracts low-pressure steam in the steam turbine and sends the low-pressure steam to the reheater for heat exchange, and the formed pressure steam is sent back to a corresponding pressure stage of the steam turbine for expansion to do work;
the steam turbine is connected with a plurality of steam turbine steam extraction pipelines which are divided into two paths, namely a pipeline and a second pipeline; the steam in the first pipeline exchanges heat with the high-pressure heater and then is collected in the second pipeline; the two pipelines are connected with the low-pressure heater for heat exchange to form a condensed water gathering pipeline;
the condenser is connected with an exhaust steam outlet of the steam turbine, and the exhaust steam is condensed by the condenser to form condensed water which enters a condensed water pipeline;
the condensed water pipeline is divided into two paths which are respectively connected with a low-pressure condensed water pump and a high-pressure condensed water pump; the outlet of the low-pressure condensate pump is sequentially connected with a low-pressure heater, a water feed pump and a high-pressure heater for heat exchange and then communicated with a water feed pipeline of the waste heat boiler; the high-pressure condensate pump lifts the condensate water pressure to the boiler water supply pressure, is connected with the soft water heater and is heated by the exhaust gas of the boiler tail process, and then is connected with the water supply pipeline of the waste heat boiler.
The system also comprises an Ender furnace, superheated steam in a main steam pipeline is divided into two paths, a main path enters a steam turbine to push the steam turbine to do work, and the other path is communicated to the Ender furnace to be used as a gasifying agent to participate in the water gas gasification reaction for cyclic utilization.
The boiler tail process exhaust gas is subjected to heat exchange and cooling through a soft water heater to reach a set temperature, and then is pressurized and stored in the pressure container.
The exhaust side heating surface of the soft water heater adopts an expansion type heating surface.
The invention has the beneficial effects that:
the waste heat boiler adopts a vertical structure, high-temperature flue gas is conveyed from the upper end to the lower end of the waste heat boiler to exchange heat with heat exchange equipment in sequence, and a large amount of dust in exhaust gas is collected at the bottom end of the waste heat boiler in a dust falling port device; the air inlet mode of the high-temperature flue gas realizes the self-blowing characteristic of the heat exchange device of the waste heat boiler, overcomes the serious problem of dust deposition of the traditional waste heat boiler, and has stronger adaptability and larger application space.
The waste heat boiler overcomes the inherent defects of serious ash accumulation and serious abrasion of the traditional waste heat boiler and the limitations of thermal expansibility and adaptability, realizes the self-purging effect by utilizing the flow of flue gas, solves the ash-staining phenomenon of all levels of heating surfaces, improves the heat transfer performance of the heating surfaces, avoids temperature difference pinch points, and realizes the safe and efficient recovery of heat energy.
The heat exchange mode of the high-temperature flue gas and the circulating working medium adopts a reverse flow heat exchange mode, so that the heat exchange efficiency is improved as much as possible while the heat exchange is strengthened; the low-pressure condensate pump and the high-pressure condensate pump are controlled, the condensate flow is strictly regulated and controlled, so that the steam extraction temperature drop and the condensate temperature rise of a steam turbine in the high-pressure heater and the low-pressure heater are constant, and the steam extraction of the steam turbine is ensured to form drainage; the heating surface on the exhaust side of the soft water heater process connected with the high-pressure condensate pump adopts an expanded heating surface to enhance heat transfer, thereby ensuring that the exhaust gas in the Ender furnace process is cooled to a set temperature and is convenient to collect.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Reference numbers for the components in the figures: 1-waste heat boiler furnace; 2-a water supply pipeline of the waste heat boiler; 3-a coal economizer; 4-an evaporator; 5-a superheater; 6-steam pocket; 7-steam-water separator; 8-a reheater; 9-main steam line; 10-a steam turbine; 11-a generator; 12-turbine reheat steam line; 13-a dead steam pipeline; 14-a condenser; 15-steam extraction pipeline of steam turbine; 16-Ender furnace generator; 17-low pressure condensate pump; 18-high pressure condensate pump; 19-low pressure heater; 20-a feed pump; 21-a high pressure heater; 22-ash falling port; 23-soft water heater; 24-a pressure vessel; 25-high temperature flue gas inlet.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment discloses a waste heat boiler, which includes a preheating boiler furnace 1, and a membrane water wall is disposed at the preheating boiler furnace 1. The upper part of the preheating boiler furnace 1 is provided with a high-temperature flue gas inlet 25. In this embodiment, the high temperature flue gas inlet 25 is connected to the Ender process exhaust.
A superheater 5, an evaporator 4 and an economizer 3 are sequentially arranged in the preheating boiler furnace 1 from top to bottom; a reheater 8 is arranged in parallel with the superheater 5 at the upper end of the boiler. After entering a hearth 1 of a preheating boiler, high-temperature flue gas respectively exchanges heat with a superheater 5, a reheater 8, an evaporator 4 and an economizer 3, saturated steam is sequentially heated to form superheated steam (corresponding to the superheater 5), reheated steam is heated to form superheated steam (corresponding to the reheater 8), saturated water is heated to form a steam-water mixture (corresponding to the evaporator 4) and boiler water supply (corresponding to the economizer 3), proper Ender process exhaust gas volume is set, and circulating working medium flow in the superheater 5, the reheater 9, the evaporator 4 and the economizer 3 is matched, so that the two heat exchange media have the same heat capacity flow rate.
The boiler water supply is connected with an economizer 3, collected at the lower header of the economizer 3 and enters the economizer 3 for heat exchange, the upper header of the economizer 3 is connected with a steam drum 6, the boiler water supply enters the economizer 3 for heating, and is pumped into the steam drum 6 from a water inlet pipe through the upper header of the economizer 3; a water outlet of the steam drum 6 is connected with a downcomer, water in the steam drum 6 descends on the downcomer, the downcomer is connected with a lower header of the evaporator 4 and enters the evaporator 4 for heat exchange, and an upper header of the evaporator 4 is connected with an ascending pipe to a steam-water separator 7 in the steam drum 6; the saturated steam outlet of the steam drum 6 is connected with the lower header of the superheater 5, and the outlet of the upper header of the superheater 5 is communicated with the main steam pipeline 9.
Ender stove process exhaust gets into in exhaust-heat boiler upper end high temperature flue gas import 25, and the heat transfer device transmits for cycle fluid in furnace and the furnace, and heat transfer device includes in the furnace: superheater 5, reheater 8, evaporimeter 4, economizer 3 and membrane wall, the process exhaust transports from top to bottom and carries out the heat transfer in proper order, and the heat transfer device circulation working medium flows in the cooperation furnace, forms exhaust and circulation working medium reverse flow heat transfer mode, promotes heat exchange efficiency.
The waste heat boiler of the embodiment overcomes the inherent defects of serious ash accumulation and serious abrasion of the traditional waste heat boiler and the limitations of thermal expansibility and adaptability, realizes the self-purging effect by utilizing the flow of flue gas, solves the ash-staining phenomenon of all levels of heating surfaces, improves the heat transfer performance of the heating surfaces, avoids temperature difference pinch points, and realizes the safe and efficient recovery of heat energy.
Example two:
as shown in fig. 1, the present embodiment discloses an efficient recovery power generation system using a waste heat boiler, including the waste heat boiler of the first embodiment, further including: the system comprises a steam turbine 10, a generator 11, a condenser 14, a steam turbine steam extraction pipeline 15, an Ender furnace generator 16, a condensate pump 17, a high-pressure condensate pump 18, a low-pressure heater 19, a water supply pump 20, a high-pressure heater 21, a soft water heater 23 and a pressure container 24.
The superheated steam in the main steam pipeline 9 is divided into two paths, and a main path enters a steam turbine to push a steam turbine 10 to do work, so that the heat-work conversion is completed to drive a generator 11 to generate electricity; the other path is communicated to an Ender furnace generator 15 and used as a gasifying agent to participate in the gasification reaction of water gas for recycling.
The steam turbine 10 is connected with a steam turbine reheating steam pipeline 12, the steam turbine reheating steam pipeline 12 extracts low-pressure steam in the steam turbine and sends the low-pressure steam into the reheater 8 for heat exchange, and the formed pressure steam is sent back to the corresponding pressure stage of the steam turbine 10 to expand and do work.
The steam turbine 10 is connected with a plurality of steam turbine extraction pipelines 15, and the plurality of steam turbine extraction pipelines 15 are divided into two paths, namely a pipeline and a second pipeline; the steam in the first pipeline exchanges heat with the high-pressure heater 21 and then is collected in the second pipeline; the two pipelines are connected with a low-pressure heater 19 for heat exchange to form a condensed water gathering pipeline.
The condenser 14 is connected with an exhaust steam outlet of the steam turbine 10, and the condenser 14 condenses exhaust steam to form condensed water which enters a condensed water pipeline.
The condensed water pipeline is divided into two paths which are respectively connected with a low-pressure condensed water pump 17 and a high-pressure condensed water pump 18; the outlet of the low-pressure condensate pump 17 is sequentially connected with a low-pressure heater 19, a water feed pump 20 and a high-pressure heater 21 for heat exchange and then communicated with a water feed pipeline 2 of the waste heat boiler; the high-pressure condensate pump 18 raises the condensate pressure to the boiler feed water pressure, is connected with the soft water heater 23 and is heated by the exhaust gas of the boiler tail process, and then is connected with the waste heat boiler feed water pipeline 2 for the next circulation.
The exhaust gas from the boiler tail process is cooled by heat exchange with the soft water heater 23 to a predetermined temperature, and then pressurized and stored in the pressure vessel 24.
The working principle of the high-efficiency recovery power generation system utilizing the waste heat boiler in the embodiment is as follows:
ender stove process exhaust gets into in exhaust-heat boiler upper end high temperature flue gas import 25, and the heat transfer device transmits for cycle fluid in furnace and the furnace, and heat transfer device includes in the furnace: superheater 5, reheater 8, evaporimeter 4, economizer 3 and membrane wall, the process exhaust transports from top to bottom and carries out the heat transfer in proper order, and the heat transfer device circulation working medium flows in the cooperation furnace, forms exhaust and circulation working medium reverse flow heat transfer mode, promotes heat exchange efficiency.
The process exhaust in the hearth of the waste heat boiler heats the boiler feed water, the waste heat boiler feed water is firstly connected with an economizer 3 through a boiler feed water pipeline 2, then the boiler feed water is injected into a steam pocket 6 through a feed water pipe, the steam pocket 6 is connected with a down pipe to a lower header of an evaporator 4, water in a pipe cluster of the evaporator 4 is heated into a steam-water mixture, a pressure difference is formed in the lower header, the steam-water mixture is pushed to enter a steam-water separator 7 in the steam pocket 6 along the up pipe, after the steam-water separation, the water is left in the steam pocket, saturated steam enters a superheater 5 along a saturated steam pipe, and superheated steam generated by further heating through the superheater enters a steam turbine 10 along a main steam.
Superheated steam generated by the superheater 5 is divided into two paths through a main steam pipeline 9, and a main path is connected with a steam turbine 10 and is sent into a steam turbine high-pressure cylinder to do work through expansion; the other path is returned to the Ender furnace to be mixed with pure oxygen from air separation and air of a fan to form a gasification agent for the water gas reaction of the Ender furnace.
The steam turbine is connected with a steam turbine reheating steam pipeline 12, the steam turbine reheating steam pipeline 12 extracts low-pressure steam in the steam turbine and sends the low-pressure steam to the reheater 8 for heat exchange, and the formed pressure steam is sent back to a corresponding pressure stage of the steam turbine for expansion and work.
The steam turbine is connected with a plurality of steam turbine extraction pipelines 15, the plurality of steam turbine extraction pipelines 12 are connected with a high-pressure heater 21 and a low-pressure heater 19, and the condensed water is heated by using partial extraction steam of the steam turbine. The multi-path steam extraction pipeline 15 of the steam turbine is divided into two paths, one path of extracted steam enters the high-pressure heater 21 to exchange heat with condensed water and then is converged with the other path of extracted steam to enter the low-pressure heater 19 to further exchange heat to form drain, and the drain of the high-pressure heater 21 and the drain of the low-pressure heater 19 are converged with the condensed water in the condenser.
The exhaust steam at the tail part of the steam turbine is introduced into a condenser 14 to exchange heat with the circulating cooling working medium to form condensed water; the drainage of the high-pressure heater 21 and the low-pressure heater 19 is converged with the condensed water in the condenser, and then the condensed water is divided into two paths, one path of the condensed water is sent into the low-pressure heater 17 through the low-pressure condensed water pump 17 to be heated by the extracted steam from the low-pressure stage of the steam turbine and to be deoxidized, and then is sent into the high-pressure heater 21 through the water feeding pump 20 to be heated to a higher temperature by the extracted steam from the high-pressure stage of the steam turbine, and then enters the boiler water; the other path is directly sent to a soft water heater 23 through a high-pressure condensate pump 18 without steam extraction heating, is heated by exhaust waste heat from a boiler tail process, then enters a boiler water supply pipeline 2 together with working medium water of the high-pressure heater, and is further heated into high-temperature and high-pressure superheated main steam through all stages of heat exchange devices of a hearth.
Exhaust gas from the Ender furnace process enters from the upper end of the waste heat boiler, exchanges heat with the superheater 5, the reheater 8, the evaporator 4 and the economizer 3 in sequence, is discharged from the lower end of the waste heat boiler, is heated by the soft water heater 23 to condense water and is drained, and is pressurized and stored in the pressure container 24 after being cooled to a set temperature.
The waste heat boiler adopts a vertical structure, the exhaust gas of the Ender furnace process is transported from the upper end of the waste heat boiler to the lower end of the waste heat boiler and exchanges heat with heat exchange equipment in sequence, and a large amount of dust in the exhaust gas is collected at the bottom end of the waste heat boiler in a dust falling port device; the special transportation mode of Ender furnace process exhaust realizes the self-blowing characteristic of the waste heat boiler heat exchange device, overcomes the serious problem of dust accumulation of the traditional waste heat boiler, and has stronger adaptability and larger application space.
The Ender furnace process exhaust and circulating working medium heat exchange modes adopt a reverse flow heat exchange mode, so that the heat exchange efficiency is improved as much as possible while the heat exchange is strengthened; controlling a low-pressure condensate pump 17 and a high-pressure condensate pump 18, strictly regulating and controlling the flow of condensate water to ensure that the steam extraction temperature drop and the condensate water temperature rise of the steam turbines in a high-pressure heater 21 and a low-pressure heater 19 are constant, and ensuring that the steam extraction of the steam turbines forms drainage; the soft water heater 23 connected with the high-pressure condensate pump 18 adopts an extended heating surface to enhance heat transfer on the process exhaust side, thereby ensuring that the temperature of the exhaust gas in the Ender furnace process is reduced to a preset temperature for convenient collection.
The embodiment overcomes the inherent defects of serious dust deposition and serious abrasion of the traditional waste heat boiler and the limitations of thermal expansibility and adaptability, avoids temperature difference pinch points, and realizes safe and efficient recovery of heat energy.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
In the description of the present invention, it is to be understood that the terms "front", "back", "upper", "lower", "left", "right", "middle" and "one", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the scope of the present invention.
Claims (7)
1. The utility model provides a waste heat boiler, includes preheating boiler furnace, its characterized in that: the upper part of the preheating boiler furnace is provided with a high-temperature flue gas inlet, and a superheater, an evaporator and an economizer are sequentially arranged in the preheating boiler furnace from top to bottom; a reheater is arranged in parallel with the superheater and is positioned at the upper end of the boiler; after entering a hearth of a preheating boiler, the high-temperature flue gas respectively exchanges heat with a superheater, a reheater, an evaporator and an economizer;
the boiler water supply is connected with an economizer, collected at a lower header of the economizer and enters the economizer for heat exchange, an upper header of the economizer is connected with a steam pocket, the boiler water supply enters the economizer for heating, and is pumped into the steam pocket from a water inlet pipe through the upper header of the economizer; a steam drum water outlet is connected with a downcomer, water in a steam drum descends on the downcomer, the downcomer is connected with a lower header of an evaporator and enters the evaporator for heat exchange, and an upper header of the evaporator is connected with an ascending pipe to a steam-water separator; the saturated steam outlet of the steam drum is connected with the lower header of the superheater, and the outlet of the upper header of the superheater is communicated with the main steam pipeline.
2. The waste heat boiler as claimed in claim 1, characterized in that: and the high-temperature flue gas inlet is connected with the Ender furnace process exhaust.
3. The waste heat boiler as claimed in claim 1, characterized in that: and a membrane water-cooled wall is arranged at the hearth of the preheating boiler.
4. The utility model provides an utilize exhaust-heat boiler's high-efficient recovery power generation system which characterized in that: comprising a waste heat boiler as claimed in any of claims 1-3, further comprising: the system comprises a steam turbine, a generator, a condenser, a steam turbine steam extraction pipeline, a condensate pump, a high-pressure condensate pump, a low-pressure heater, a water feed pump, a high-pressure heater and a soft water heater;
the superheated steam in the main steam pipeline enters a steam turbine to push the steam turbine to do work, and the heat-work conversion is completed to drive a generator to generate electricity;
the steam turbine is connected with a steam turbine reheating steam pipeline, the steam turbine reheating steam pipeline extracts low-pressure steam in the steam turbine and sends the low-pressure steam to the reheater for heat exchange, and the formed pressure steam is sent back to a corresponding pressure stage of the steam turbine for expansion to do work;
the steam turbine is connected with a plurality of steam turbine steam extraction pipelines which are divided into two paths, namely a pipeline and a second pipeline; the steam in the first pipeline exchanges heat with the high-pressure heater and then is collected in the second pipeline; the two pipelines are connected with the low-pressure heater for heat exchange to form a condensed water gathering pipeline;
the condenser is connected with an exhaust steam outlet of the steam turbine, and the exhaust steam is condensed by the condenser to form condensed water which enters a condensed water pipeline;
the condensed water pipeline is divided into two paths which are respectively connected with a low-pressure condensed water pump and a high-pressure condensed water pump; the outlet of the low-pressure condensate pump is sequentially connected with a low-pressure heater, a water feed pump and a high-pressure heater for heat exchange and then communicated with a water feed pipeline of the waste heat boiler; the high-pressure condensate pump lifts the condensate water pressure to the boiler water supply pressure, is connected with the soft water heater and is heated by the exhaust gas of the boiler tail process, and then is connected with the water supply pipeline of the waste heat boiler.
5. The high efficiency recovery waste heat boiler power generating system of claim 4, wherein: the system also comprises an Ender furnace, superheated steam in a main steam pipeline is divided into two paths, a main path enters a steam turbine to push the steam turbine to do work, and the other path is communicated to the Ender furnace to be used as a gasifying agent to participate in the water gas gasification reaction for cyclic utilization.
6. The high efficiency recovery waste heat boiler power generating system according to claim 4 or 5, characterized in that: the boiler tail process exhaust gas is subjected to heat exchange and cooling through a soft water heater to reach a set temperature, and then is pressurized and stored in the pressure container.
7. The high efficiency recovery waste heat boiler power generating system of claim 6, wherein: the exhaust side heating surface of the soft water heater adopts an expansion type heating surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010503047.5A CN111649310A (en) | 2020-06-05 | 2020-06-05 | Waste heat boiler and efficient recovery power generation system using same |
Applications Claiming Priority (1)
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| CN111577401A (en) * | 2020-04-30 | 2020-08-25 | 宝钢工程技术集团有限公司 | Tail dehumidification device of saturated steam turbine generator unit and use method thereof |
| CN113790088A (en) * | 2021-04-02 | 2021-12-14 | 南京凯盛开能环保能源有限公司 | Industrial waste heat recovery efficient power generation method and system |
| CN113804006A (en) * | 2021-09-17 | 2021-12-17 | 华泰永创(北京)科技股份有限公司 | Coke oven flue waste heat recovery system |
| CN117318107A (en) * | 2023-09-25 | 2023-12-29 | 华北电力大学 | High-pressure hot water energy storage peak shaving system of coal-fired unit |
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| CN117318107B (en) * | 2023-09-25 | 2024-03-29 | 华北电力大学 | High-pressure hot water energy storage peak shaving system of coal-fired unit |
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Application publication date: 20200911 |