CN116045266A - Energy-saving system and method for comprehensive utilization of waste heat of autoclave and boiler - Google Patents
Energy-saving system and method for comprehensive utilization of waste heat of autoclave and boiler Download PDFInfo
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- CN116045266A CN116045266A CN202211682855.8A CN202211682855A CN116045266A CN 116045266 A CN116045266 A CN 116045266A CN 202211682855 A CN202211682855 A CN 202211682855A CN 116045266 A CN116045266 A CN 116045266A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
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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
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
- F28C3/08—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour with change of state, e.g. absorption, evaporation, condensation
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Abstract
The invention discloses an energy-saving system for comprehensively utilizing waste heat of an autoclave and a boiler, which comprises the autoclave and the boiler for providing high-temperature and high-pressure steam for the autoclave, wherein soft water entering a soft water tank is sent to a boiler condenser through a deoxidization pump to exchange heat with hot flue gas, the heated soft water is sent to the other side of a heat exchanger to exchange heat with condensed water, and the heated soft water is continuously sent to a heater and is mixed with residual steam, flash steam and hot steam sent to the heater to be heated to generate high-temperature soft water; the high-temperature soft water is sent to the boiler deaerator from the heater through the high-temperature water return pump, is heated in the boiler deaerator through high-temperature and high-pressure steam input to the boiler deaerator to deoxidize, and then is pumped by the boiler water supply pump to exchange heat with hot flue gas, and the water temperature of the soft water after heat exchange is raised and then enters the boiler to generate high-temperature and high-pressure steam.
Description
Technical Field
The invention relates to the technical field of energy conservation of residual steam of autoclaves, in particular to an energy conservation system and method for comprehensively utilizing the residual heat of autoclaves and boilers.
Background
The autoclave is a large pressure vessel with huge external volume, huge internal volume and heavy weight. The autoclaved kettle has very wide application and is widely applied to autoclaved curing of building materials such as concrete pipe piles, aerated concrete blocks, novel light wall materials, lime sand bricks, coal ash bricks and the like in a large quantity, so that CaO-SiO is completed in the kettle 2 —H 2 Hydrothermal reaction of O. The autoclave has high energy consumption in the application process, and is usually steamed for 10 hours by high-temperature high-pressure steam of 1.0Mpa/180 ℃, a large amount of high-temperature condensate is generated in the steam autoclave, the pressure is reduced to zero when the autoclave is discharged, and residual steam is discharged, so that the residual steam and the high-temperature condensate cannot be directly recycled because the alkalinity of the high-temperature condensate is as high as PH12, and the recovery of the residual steam and the high-temperature condensate is quite difficult. The existing industry adopts a reverse kettle mode to recycle residual steam, namely, the pressure relief kettle corresponds to a kettle to be boosted, the pressure relief kettle with the pressure of 1.0Mpa is communicated with the kettle to be boosted without steam when the kettle is discharged, the pressure relief kettle fills residual steam into the kettle to be boosted, the pressure of the pressure relief kettle is reduced to about 0.3Mpa when the pressure of the two kettles is balanced, and then an emptying valve is opened to discharge the residual steam of 0.3Mpa to the atmosphere and discharge high-temperature condensate outwards, so that a large amount of residual heat energy is discharged outwards, and waste and environmental pollution are caused.
Some large water tanks are used for recycling part of waste heat of residual steam and high-temperature condensed water of the still kettle, but the efficiency is low, and the recycling amount is very small; some recovery is used for heating boiler soft water, but the recovery is not considered together with the intermittent recovery of the boiler, so that the recovery of low-grade heat energy is surplus, the recovery efficiency is low, the flow fluctuation is large and intermittent, the temperature of the boiler soft water is high and low, the heat efficiency and the operation safety of the boiler are influenced, the actual effect is greatly reduced, and the application is not ideal; the whole industry is in a rough management stage with very low waste heat recovery and utilization rate.
Therefore, how to effectively recycle the waste heat of the autoclave and the boiler for comprehensive utilization and realize the aims of energy conservation and consumption reduction is a great technical problem for the technicians in the industry.
Disclosure of Invention
The invention aims to provide an energy-saving system and method for comprehensively utilizing waste heat of autoclaves and boilers, which can effectively solve the technical problems in the prior art.
In order to achieve the above purpose, an embodiment of the present invention provides an energy saving system for comprehensive utilization of waste heat of an autoclave and a boiler, including the autoclave and a boiler for providing high temperature and high pressure steam for the autoclave, and further including a boiler energy saver, a boiler condenser, an aspirator, a flash tank, a heat exchanger, a heater, a condensation pool, a boiler deaerator, a soft water tank, a deaeration pump, a boiler feed pump, a hot water pump and a high temperature return pump;
The residual steam discharging port of the autoclave is connected with the suction inlet of the aspirator through a pipeline, the output port of the aspirator is communicated with the heater through a pipeline, and the residual steam discharged from the autoclave is conveyed into the heater through the aspirator; the high-temperature condensed water discharge port of the autoclave is communicated with the flash tank through a pipeline, the high-temperature condensed water discharged in the autoclave is subjected to steam-water separation through the flash tank to generate flash steam and condensed water, the flash steam is conveyed into the heater through the aspirator through a pipeline connected between the flash steam discharge port of the flash tank and the suction inlet of the aspirator, and the condensed water is discharged into the condensed water tank through a pipeline connected between the condensed water discharge port of the flash tank and the input end of the condensed water tank; the output end of the condensation water tank is communicated with one side of the heat exchanger through the hot water pump, condensed water in the condensation water tank enters the heat exchanger for exchange under the pumping of the hot water pump, and cooled condensed water is discharged to the wastewater recovery tank;
the fuel gas or fuel is combusted in a hearth of the boiler, and hot flue gas flows through the boiler economizer and the boiler condenser to be discharged from a chimney; the soft water entering the soft water tank is pumped to a boiler condenser through the deoxidizing pump to exchange heat with hot flue gas, the heated soft water is continuously sent to the other side of the heat exchanger to exchange heat with the condensed water, and the heated soft water is continuously sent to the heater and is mixed with residual steam, flash steam and hot steam sent to the heater to be heated to generate high-temperature soft water; the high-temperature soft water is sent to the boiler deaerator from the heater through the high-temperature water return pump, is heated in the boiler deaerator through high-temperature and high-pressure steam input to the boiler deaerator to deoxidize, is pumped to the boiler energy-saving device through the boiler water supply pump to exchange heat with hot flue gas, and the water temperature of the soft water after heat exchange is increased and then enters the boiler to generate the high-temperature and high-pressure steam;
The high-temperature high-pressure steam generated by the boiler is conveyed into the boiler deaerator through a pipeline on one hand, and is conveyed into the sub-cylinder through a pipeline on the other hand, a first steam outlet of the sub-cylinder is connected with a high-temperature high-pressure steam input port of the autoclave, and a second steam outlet of the sub-cylinder is connected with a high-temperature high-pressure steam input port of the aspirator.
As improvement of the scheme, after the river water is softened, the river water enters a soft water tank, the water temperature in summer and autumn is 25-30 ℃, the water is pumped to a boiler condenser for heat exchange through a deoxidization pump, the temperature of the soft water is increased to 42-48 ℃, and the temperature of flue gas at the other side of the boiler condenser is reduced to 53-59 ℃ and is discharged through a chimney; soft water at 42-48 ℃ is continuously sent to a heat exchanger for heat exchange, the temperature of the soft water is increased to 60-65 ℃, condensed water at 92-98 ℃ of a condensed water pool is pumped by a hot water pump at the other side of the heat exchanger for exchange with soft water at 42-48 ℃, and the condensed water is discharged to a wastewater recovery pool after the temperature of the condensed water is reduced to 44-50 ℃; soft water at 60-65 ℃ is continuously sent to a heater and residual steam, flash steam and hot steam are subjected to steam-water mixing heating to generate high-temperature soft water at 72-78 ℃; the high-temperature soft water with the temperature of 72-78 ℃ is sent to a boiler deaerator from a heater by a high-temperature water return pump, is heated to 100-105 ℃ by high-temperature high-pressure steam to deoxidize, is pumped by a boiler water supply pump to exchange heat with hot flue gas of the boiler, and is heated to 127-133 ℃ to generate high-temperature high-pressure steam with the temperature of 1.0Mpa/180 ℃ after heat exchange.
As an improvement of the scheme, after the river water is softened, the river water enters a soft water tank, the water temperature in summer and autumn is 27 ℃, the water is pumped to a boiler condenser for heat exchange through deoxygenation, the temperature of the soft water is increased to 45 ℃, and the temperature of flue gas at the other side of the boiler condenser is reduced to 56 ℃ and is discharged through a chimney; continuously delivering soft water at 45 ℃ to a heat exchanger for heat exchange, wherein the temperature of the soft water is raised to 62 ℃, pumping 95 ℃ condensed water in a condensed water pool by a hot water pump at the other side of the heat exchanger for exchange with soft water at 45 ℃, and discharging the condensed water to a wastewater recovery pool after the temperature of the condensed water is lowered to 47 ℃; soft water at 62 ℃ is continuously sent to a heater, and the residual steam, flash steam and hot steam are subjected to steam-water mixing heating to generate high-temperature soft water at 75 ℃; the high-temperature soft water at 75 ℃ is sent to a boiler deaerator from a heater by a high-temperature water return pump, is heated to 102 ℃ by high-temperature high-pressure steam to deoxidize, is pumped by a boiler water supply pump to exchange heat with hot flue gas of the boiler, and after heat exchange, the temperature of the soft water at 102 ℃ is increased to 130 ℃ and enters the boiler to generate high-temperature high-pressure steam at 1.0Mpa/180 ℃.
As an improvement of the scheme, when the autoclave is inverted, 0.3Mpa residual steam and high-temperature condensate water still remain in the autoclave, the residual steam is discharged firstly, the residual steam is conveyed into a heater by pressure, and the residual steam and soft water at 60-65 ℃ are mixed and heated to generate high-temperature soft water at 72-78 ℃;
When the pressure in the autoclave is reduced to 0.2Mpa, discharging high-temperature condensed water, performing steam-water separation on the high-temperature condensed water through a flash steam and condensed water, mixing and heating the flash steam to a heater and soft water at 60-65 ℃ to generate high-temperature soft water at 72-78 ℃, and discharging the condensed water into a condensed water pool;
when the pressure in the autoclave is reduced to 0.1Mpa, the discharge of residual steam becomes slow and difficult along with the lower pressure, at the moment, the aspirator opens high-temperature high-pressure steam, the aspirator absorbs low-pressure residual steam and normal-pressure residual steam through high-temperature high-pressure steam injection, the residual steam in the autoclave is continuously sucked, and is combined into hot steam, and the hot steam is sent to the heater and the soft water at 60-65 ℃ for mixed heating to generate the soft water at 72-78 ℃ until the pressure in the autoclave is reduced to zero, so that the residual steam in the autoclave is sucked and cleaned.
As an improvement of the scheme, when the autoclave is inverted, 0.3Mpa residual steam and high-temperature condensate water still remain in the autoclave, the residual steam is discharged firstly, the residual steam is conveyed into a heater by pressure, and the residual steam and the soft water at 62 ℃ are mixed and heated to generate the high-temperature soft water at 75 ℃;
when the pressure in the autoclave is reduced to 0.2Mpa, discharging high-temperature condensed water, performing steam-water separation on the high-temperature condensed water through a flash steam and condensed water, sending the flash steam to a heater, mixing and heating the flash steam with soft water at 62 ℃ to generate high-temperature soft water at 75 ℃, and discharging the condensed water into a condensed water pool;
When the pressure in the autoclave is reduced to 0.1Mpa, the discharge of residual steam becomes slow and difficult along with the lower pressure, at the moment, the aspirator opens high-temperature high-pressure steam, the aspirator absorbs low-pressure residual steam and normal-pressure residual steam through high-temperature high-pressure steam injection, the residual steam in the autoclave is continuously sucked, and is combined into hot steam, and the hot steam is sent to the heater and the soft water at 62 ℃ together to be mixed and heated to generate the soft water at 75 ℃ until the pressure in the autoclave is reduced to zero, so that the residual steam in the autoclave is sucked and cleaned.
As an improvement of the scheme, a plurality of spray heads, filling materials and distribution pipes are arranged in the heater, the spray heads are communicated with the pipeline for inputting soft water, and the spray heads are arranged above the filling materials; the distribution pipe is communicated with a pipeline for inputting the residual steam, the flash steam and the hot steam, and is arranged below the filler; and after the soft water sprayed out by the spray header passes through the filler, the soft water is mixed with residual steam, flash steam and hot steam entering the distribution pipe for steam-water heating, so that high-temperature soft water is generated.
As an improvement of the scheme, the autoclave comprises a plurality of autoclaves, and the pressure relief of the autoclaves is staggered in order to form continuous discharge and recovery processes of residual steam and high-temperature condensate.
As an improvement of the scheme, the high-temperature and high-pressure steam generated by the boiler is conveyed to a steam-curing pool and a steam-using section for drying through a pipeline.
As an improvement of the above scheme, the pipeline is respectively provided with a switch valve to open or close the water/gas circulation on the pipeline.
The invention further provides an energy-saving method for comprehensively utilizing waste heat of an autoclave and a boiler, which comprises the following steps:
s1, burning fuel gas or fuel in a hearth of a boiler, discharging hot flue gas from a chimney through an energy saver of the boiler and a condenser of the boiler, and respectively sending high-temperature and high-pressure steam generated by the boiler into an autoclave, an aspirator and a boiler deaerator, wherein the high-temperature and high-pressure steam sent into the autoclave is cooled into high-temperature condensate through heat exchange;
s2, conveying residual steam discharged from the autoclave to the heater through the aspirator, separating steam from water by high-temperature condensed water discharged from the autoclave through a flash tank, generating flash steam and condensed water, conveying the flash steam to the heater through the aspirator, discharging the condensed water into a condensed water tank, and discharging the condensed water discharged into the condensed water tank to one side of a heat exchanger for exchange under the pumping of a hot water pump, wherein the cooled condensed water is discharged into a wastewater recovery tank;
S3, delivering the soft water entering the soft water tank to the boiler condenser through a deoxidizing pump to exchange heat with hot flue gas, delivering the heated soft water to the other side of the heat exchanger to exchange heat with the condensed water, and delivering the heated soft water to the heater to be mixed with residual steam, flash steam and hot steam delivered to the heater for steam-water heating to generate high-temperature soft water;
s4, conveying the high-temperature soft water to a boiler deaerator from a heater through a high-temperature water return pump, heating the boiler deaerator by high-temperature and high-pressure steam input to the boiler deaerator to deoxidize the high-temperature soft water, pumping the high-temperature soft water to the boiler energy-saving device through a boiler water supply pump to exchange heat with hot flue gas, and lifting the water temperature of the soft water after heat exchange and then enabling the soft water to enter the boiler to generate the high-temperature and high-pressure steam.
As an improvement of the above solution, the step S3 specifically includes:
the river water enters a soft water tank after softening treatment, the water temperature of the soft water in summer and autumn is 27 ℃, the soft water is pumped to a boiler condenser for heat exchange through deoxidization, the temperature of the soft water is increased to 45 ℃, and the temperature of flue gas at the other side of the boiler condenser is reduced to 56 ℃ and is discharged through a chimney; continuously delivering soft water at 45 ℃ to a heat exchanger for heat exchange, wherein the temperature of the soft water is increased to 62 ℃, pumping 95 ℃ condensed water in a condensed water pool by a hot water pump at the other side of the heat exchanger for exchange with soft water at 45 ℃, and discharging the condensed water to a wastewater recovery pool after the temperature of the condensed water is reduced to 47 ℃; soft water at 62 ℃ is continuously sent to a heater, and the residual steam, flash steam and hot steam are subjected to steam-water mixing heating to generate high-temperature soft water at 75 ℃;
As an improvement of the above solution, the step S4 specifically includes:
the high-temperature soft water at 75 ℃ is sent to a boiler deaerator from a heater by a high-temperature water return pump, is heated to 102 ℃ by high-temperature high-pressure steam to deoxidize, is pumped by a boiler water supply pump to exchange heat with hot flue gas of the boiler, and after heat exchange, the temperature of the soft water at 102 ℃ is increased to 130 ℃ and enters the boiler to generate high-temperature high-pressure steam at 1.0Mpa/180 ℃.
As an improvement of the above solution, the step S2 specifically includes:
when the autoclave is inverted, 0.3Mpa residual steam and high-temperature condensed water still remain in the autoclave, the residual steam is discharged firstly, the residual steam is conveyed into a heater by pressure, and the residual steam and the soft water at 62 ℃ are mixed and heated to generate 75 ℃ high-temperature soft water;
when the pressure in the autoclave is reduced to 0.2Mpa, discharging high-temperature condensed water, performing steam-water separation on the high-temperature condensed water through a flash steam and condensed water, sending the flash steam to a heater, mixing and heating the flash steam with soft water at 62 ℃ to generate high-temperature soft water at 75 ℃, and discharging the condensed water into a condensed water pool;
when the pressure in the autoclave is reduced to 0.1Mpa, the discharge of residual steam becomes slow and difficult along with the lower pressure, at the moment, the aspirator opens high-temperature high-pressure steam, the aspirator absorbs low-pressure residual steam and normal-pressure residual steam through high-temperature high-pressure steam injection, the residual steam in the autoclave is continuously sucked, and is combined into hot steam, and the hot steam is sent to the heater and the soft water at 62 ℃ together to be mixed and heated to generate the soft water at 75 ℃ until the pressure in the autoclave is reduced to zero, so that the residual steam in the autoclave is sucked and cleaned.
Compared with the prior art, the energy-saving system and the method for comprehensively utilizing the waste heat of the autoclaves and the boilers provided by the embodiment of the invention have the following technical effects:
(1) The method can comprehensively recycle waste heat of the autoclaves and the boilers in production operation to the greatest extent, comprehensively recycle high-low grade heat energy according to gradient, ensure continuous and stable production operation, save energy, reduce consumption and reduce the influence of external discharge on the environment.
(2) And recycling residual steam and high-temperature condensed water discharged from the autoclave, and simultaneously taking into account the waste heat utilization of the boiler, comprehensively recycling the waste heat of the autoclave and the boiler to the greatest extent in production operation, and comprehensively recycling high-low grade heat energy according to gradient.
(3) The autoclave is sequentially and misplaced to discharge the waste heat from the boiler, and the waste heat is recycled according to the high-low grade gradient of the waste heat, so that the waste heat recycling efficiency is high, and the long-period production operation is continuous, safe and stable.
(4) The residual steam of the still kettle is sent to the heater and is heated by steam-water mixing, so that the heat efficiency is high.
(5) The aspirator is used for absorbing low-pressure residual steam and normal-pressure residual steam through high-temperature high-pressure steam injection, so that residual steam in the kettle can be sucked cleanly, and the residual steam is thoroughly recovered.
(6) The existing boiler equipment is not changed, the investment is saved, the project construction and installation period is short, and the normal production is not affected during the construction period.
(7) The energy-saving effect is obvious, the input-output ratio is high, and the investment cost can be recovered after more than 4-6 months.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an energy-saving system for comprehensive utilization of waste heat of an autoclave and a boiler according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a heater of an energy-saving system for comprehensive utilization of waste heat of an autoclave and a boiler according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart of an energy-saving method for comprehensive utilization of waste heat of an autoclave and a boiler according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may communicate with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, the embodiment of the invention provides an energy-saving system for comprehensive utilization of waste heat of an autoclave and a boiler, which comprises the autoclave 1, the boiler 2 for providing high-temperature and high-pressure steam for the autoclave 1, a boiler energy-saving device 3, a boiler condenser 4, an aspirator 5, a flash tank 6, a heat exchanger 7, a heater 8, a condensation water tank 9, a boiler deaerator 10, a soft water tank 11, a deaeration pump 12, a boiler feed pump 13, a hot water pump 14 and a high-temperature return pump 15.
Specifically, the residual steam discharge port of the autoclave 1 is connected with the suction port of the aspirator 5 through a pipeline, the output port of the aspirator 5 is communicated with the heater 8 through a pipeline, and the residual steam discharged from the autoclave 1 is conveyed into the heater 8 through the aspirator 5. The high-temperature condensate water discharge port of the autoclave 1 is communicated with the expander 6 through a pipeline, the high-temperature condensate water discharged in the autoclave 1 is subjected to steam-water separation through the expander 6 to generate flash steam and condensate water, the flash steam is conveyed into the heater 8 through the aspirator 5 through a pipeline connected between the flash steam discharge port of the expander 6 and the suction port of the aspirator 5, and the condensate water is discharged into the condensate water tank 9 through a pipeline connected between the condensate water discharge port of the expander 6 and the input end of the condensate water tank 9. The output end of the condensation water tank 9 is communicated with one side of the heat exchanger 7 through the hot water pump 14, condensed water in the condensation water tank 9 enters the heat exchanger 7 for exchange under the pumping of the hot water pump 14, and cooled condensed water is discharged to the wastewater recovery tank.
In addition, the fuel gas or fuel is burned in the furnace of the boiler 2, and the hot flue gas is discharged from the chimney through the boiler economizer 3 and the boiler condenser 4. The soft water entering the soft water tank 11 is sent to the boiler condenser 4 through the deoxidizing pump 12 to exchange heat with hot flue gas, the heated soft water is sent to the other side of the heat exchanger 7 to exchange heat with the condensed water, and the heated soft water is continuously sent to the heater 8 to be mixed with residual steam, flash steam and hot steam sent to the heater 8 for steam-water heating, so that high-temperature soft water is generated. The generated high Wen Ruanshui is sent to the boiler deaerator 10 from the heater 8 through the high-temperature water return pump 15, is heated in the boiler deaerator 10 through high-temperature and high-pressure steam input to the boiler deaerator 10 to deoxidize, is then pumped to the boiler economizer 3 through the boiler water feed pump 13 to exchange heat with hot flue gas, and the water temperature of the soft water after heat exchange is raised and then enters the boiler 2 to generate the high-temperature and high-pressure steam.
The high-temperature high-pressure steam generated by the boiler 2 is conveyed into the boiler deaerator 10 through a pipeline on one hand, and is conveyed into a sub-cylinder through a pipeline on the other hand, a first steam outlet of the sub-cylinder is connected with a high-temperature high-pressure steam input port of the autoclave 1, and a second steam outlet of the sub-cylinder is connected with a high-temperature high-pressure steam input port of the aspirator 5. In addition, the high-temperature and high-pressure steam generated by the boiler 2 is further conveyed to steam-using sections such as a steam-curing pool and drying through a pipeline.
It will be appreciated that in this embodiment, the autoclave 1 includes a plurality of autoclaves, preferably, a plurality of autoclaves 1, and the pressure relief steps are staggered in order to form a continuous discharge and recovery process of residual steam and high temperature condensate.
It will be appreciated that the conduits are provided with on-off valves to open or close the flow of water/gas over the conduits, respectively. In addition, a pressure reducing valve is arranged on part of the pipeline to cooperate with the switch valve for working.
Referring to fig. 2, the heater 8 is provided with a plurality of spray heads 81, a filler 82 and a distribution pipe 83, wherein a plurality of spray heads 81 are communicated with a pipeline for inputting soft water, and the spray heads 81 are arranged above the filler 82. The distribution pipe 83 is communicated with the pipeline for inputting the residual steam, flash steam and hot steam, and the distribution pipe 83 is arranged below the packing 82. In this way, the soft water sprayed by the spray header 81 passes through the packing 82 and is heated by steam-water mixing with the residual steam, flash steam and hot steam entering the distribution pipe 83, so as to generate high Wen Ruanshui, the generated high Wen Ruanshui high temperature water return pump 15 is sent from the heater 8 to the boiler deaerator 10, is heated by high temperature and high pressure steam input to the boiler deaerator 10 in the boiler deaerator 10 to remove oxygen, is pumped to the boiler energy saver 3 by the boiler water supply pump 13 to exchange heat with hot flue gas, and the water temperature of the soft water after heat exchange is raised and enters the boiler 2 to generate the high temperature and high pressure steam.
Referring back to fig. 1, the pressure relief of the plurality of autoclaves is staggered in order, and the continuous discharge and recovery process of residual steam and high-temperature condensed water is basically formed. Specifically, the paths of the residual steam flow, the high-temperature condensate flow and the condensate flow related to each autoclave are specifically as follows:
and (3) residual steam flow: autoclave 1- & gtaspirator 5- & gtheater 8
And (3) a warm condensate flow path: still kettle 1, expander 6, condensate water and condensate water pool 9
Still kettle 1, expander 6, flash steam, aspirator 5 and heater 8
And (3) condensate flow: the condensed water pool 9, the hot water pump 14, the heat exchanger 7 and the wastewater recovery pool.
Wherein, the condensed water specifically refers to: the high-temperature condensed water is decompressed by a flash tank to generate flash steam and condensed water.
With continued reference to fig. 1, in the boiler, the hot flue gas flow and the soft water flow paths involved are specifically as follows:
the hot flue gas flow of the boiler is as follows: combustion in hearth, boiler economizer 3, boiler condenser 4 and discharge from chimney
And (3) soft water flow: the method comprises the steps of a soft water tank 11, a deoxidizing pump 12, a boiler condenser 4, a heat exchanger 7, a heater 8, a high-temperature water return pump 15, a boiler deoxidizer 10, a boiler water supply pump 13, a boiler energy saver 3, a boiler 2 and high-temperature and high-pressure steam generation.
It can be appreciated that in an alternative embodiment, after the river water is softened, the river water enters a soft water tank, the water temperature in summer and autumn is 25-30 ℃, the water is pumped to a boiler condenser for heat exchange through deoxidization, the temperature of the soft water is increased to 42-48 ℃, and the temperature of the flue gas at the other side of the boiler condenser is reduced to 53-59 ℃ and is discharged through a chimney; soft water at 42-48 ℃ is continuously sent to a heat exchanger for heat exchange, the temperature of the soft water is increased to 60-65 ℃, condensed water at 92-98 ℃ of a condensed water pool is pumped by a hot water pump at the other side of the heat exchanger for exchange with soft water at 42-48 ℃, and the condensed water is discharged to a wastewater recovery pool after the temperature of the condensed water is reduced to 44-50 ℃; soft water at 60-65 deg.c is further fed to heater and the residual steam, flash steam and hot steam to produce high temperature soft water at 72-78 deg.c.
The high-temperature soft water with the temperature of 72-78 ℃ is sent to a boiler deaerator from a heater by a high-temperature water return pump, is heated to 100-105 ℃ by high-temperature high-pressure steam to deoxidize, is pumped by a boiler water supply pump to exchange heat with hot flue gas of a boiler, and is heated to 127-133 ℃ to generate high-temperature high-pressure steam with the temperature of 1.0Mpa/180 ℃ after heat exchange.
Meanwhile, after the autoclave is inverted, residual steam of 0.3Mpa and high-temperature condensed water still remain in the autoclave, the residual steam is discharged firstly, the residual steam is conveyed into a heater by pressure, and the residual steam and soft water of 60-65 ℃ are mixed and heated to generate high-temperature soft water of 72-78 ℃;
when the pressure in the autoclave is reduced to 0.2Mpa, discharging high-temperature condensed water, performing steam-water separation on the high-temperature condensed water through a flash steam and condensed water, mixing and heating the flash steam to a heater and soft water at 60-65 ℃ to generate high-temperature soft water at 72-78 ℃, and discharging the condensed water into a condensed water pool;
when the pressure in the autoclave is reduced to 0.1Mpa, the discharge of residual steam becomes slow and difficult along with the lower pressure, at the moment, the aspirator opens high-temperature high-pressure steam, the aspirator absorbs low-pressure residual steam and normal-pressure residual steam through high-temperature high-pressure steam injection, the residual steam in the autoclave is continuously sucked, and is combined into hot steam, and the hot steam is sent to the heater and the soft water at 60-65 ℃ for mixed heating to generate the soft water at 72-78 ℃ until the pressure in the autoclave is reduced to zero, so that the residual steam in the autoclave is sucked and cleaned.
It can be understood that as a more preferable embodiment, the river water enters a soft water tank after softening treatment, the water temperature of the soft water in summer and autumn is 27 ℃, the soft water is pumped to a boiler condenser for heat exchange through deoxygenation, the temperature of the soft water is increased to 45 ℃, and the temperature of the flue gas at the other side of the boiler condenser is reduced to 56 ℃ and is discharged through a chimney; continuously delivering soft water at 45 ℃ to a heat exchanger for heat exchange, wherein the temperature of the soft water is raised to 62 ℃, pumping 95 ℃ condensed water in a condensed water pool by a hot water pump at the other side of the heat exchanger for exchange with soft water at 45 ℃, and discharging the condensed water to a wastewater recovery pool after the temperature of the condensed water is lowered to 47 ℃; soft water at 62 ℃ is continuously sent to a heater, and the residual steam, flash steam and hot steam are subjected to steam-water mixing heating to generate high-temperature soft water at 75 ℃; the high-temperature soft water at 75 ℃ is sent to a boiler deaerator from a heater by a high-temperature water return pump, is heated to 102 ℃ by high-temperature high-pressure steam to deoxidize, is pumped by a boiler water supply pump to exchange heat with hot flue gas of the boiler, and after heat exchange, the temperature of the soft water at 102 ℃ is increased to 130 ℃ and enters the boiler to generate high-temperature high-pressure steam at 1.0Mpa/180 ℃.
Meanwhile, after the autoclave is inverted, 0.3Mpa residual steam and high-temperature condensed water still remain in the autoclave, the residual steam is discharged firstly, the residual steam is conveyed into a heater by pressure, and the residual steam and the soft water at 62 ℃ are mixed and heated to generate the high-temperature soft water at 75 ℃;
when the pressure in the autoclave is reduced to 0.2Mpa, discharging high-temperature condensed water, performing steam-water separation on the high-temperature condensed water through a flash steam and condensed water, sending the flash steam to a heater, mixing and heating the flash steam with soft water at 62 ℃ to generate high-temperature soft water at 75 ℃, and discharging the condensed water into a condensed water pool;
when the pressure in the autoclave is reduced to 0.1Mpa, the discharge of residual steam becomes slow and difficult along with the lower pressure, at the moment, the aspirator opens high-temperature high-pressure steam, the aspirator absorbs low-pressure residual steam and normal-pressure residual steam through high-temperature high-pressure steam injection, the residual steam in the autoclave is continuously sucked, and is combined into hot steam, and the hot steam is sent to the heater and the soft water at 62 ℃ together to be mixed and heated to generate the soft water at 75 ℃ until the pressure in the autoclave is reduced to zero, so that the residual steam in the autoclave is sucked and cleaned.
Referring to fig. 3, an embodiment of the present invention provides an energy saving method for comprehensive utilization of waste heat of an autoclave and a boiler, including the following steps:
s1, burning fuel gas or fuel in a hearth of a boiler, discharging hot flue gas from a chimney through an energy saver of the boiler and a condenser of the boiler, and respectively sending high-temperature and high-pressure steam generated by the boiler into an autoclave, an aspirator and a boiler deaerator, wherein the high-temperature and high-pressure steam sent into the autoclave is cooled into high-temperature condensate through heat exchange;
S2, conveying residual steam discharged from the autoclave to the heater through the aspirator, separating steam from water by high-temperature condensed water discharged from the autoclave through a flash tank, generating flash steam and condensed water, conveying the flash steam to the heater through the aspirator, discharging the condensed water into a condensed water tank, and discharging the condensed water discharged into the condensed water tank to one side of a heat exchanger for exchange under the pumping of a hot water pump, wherein the cooled condensed water is discharged into a wastewater recovery tank;
s3, delivering the soft water entering the soft water tank to the boiler condenser through a deoxidizing pump to exchange heat with hot flue gas, delivering the heated soft water to the other side of the heat exchanger to exchange heat with the condensed water, and delivering the heated soft water to the heater to be mixed with residual steam, flash steam and hot steam delivered to the heater for steam-water heating to generate high-temperature soft water;
s4, conveying the high-temperature soft water to a boiler deaerator from a heater through a high-temperature water return pump, heating the boiler deaerator by high-temperature and high-pressure steam input to the boiler deaerator to deoxidize the high-temperature soft water, pumping the high-temperature soft water to the boiler energy-saving device through a boiler water supply pump to exchange heat with hot flue gas, and lifting the water temperature of the soft water after heat exchange and then enabling the soft water to enter the boiler to generate the high-temperature and high-pressure steam.
In a preferred embodiment, the step S3 specifically includes: after the river water is softened, the river water enters a soft water tank, the water temperature in summer and autumn is 25-30 ℃, the water is pumped to a boiler condenser for heat exchange through deoxidization, the temperature of the soft water is increased to 42-48 ℃, the temperature of flue gas at the other side of the boiler condenser is reduced to 53-59 ℃, and the flue gas is discharged through a chimney; soft water at 42-48 ℃ is continuously sent to a heat exchanger for heat exchange, the temperature of the soft water is increased to 60-65 ℃, condensed water at 92-98 ℃ of a condensed water pool is pumped by a hot water pump at the other side of the heat exchanger for exchange with soft water at 42-48 ℃, and the condensed water is discharged to a wastewater recovery pool after the temperature of the condensed water is reduced to 44-50 ℃; soft water at 60-65 deg.c is further fed to heater and the residual steam, flash steam and hot steam to produce high temperature soft water at 72-78 deg.c.
Correspondingly, the step S4 specifically includes: the high-temperature soft water with the temperature of 72-78 ℃ is sent to a boiler deaerator from a heater by a high-temperature water return pump, is heated to 100-105 ℃ by high-temperature high-pressure steam to deoxidize, is pumped by a boiler water supply pump to exchange heat with hot flue gas of a boiler, and is heated to 127-133 ℃ to generate high-temperature high-pressure steam with the temperature of 1.0Mpa/180 ℃ after heat exchange.
Correspondingly, the step S2 specifically includes: when the autoclave is inverted, 0.3Mpa residual steam and high-temperature condensed water still remain in the autoclave, the residual steam is discharged firstly, the residual steam is conveyed into a heater by pressure, and the residual steam and soft water at 60-65 ℃ are mixed and heated to generate high-temperature soft water at 72-78 ℃;
when the pressure in the autoclave is reduced to 0.2Mpa, discharging high-temperature condensed water, performing steam-water separation on the high-temperature condensed water through a flash steam and condensed water, mixing and heating the flash steam to a heater and soft water at 60-65 ℃ to generate high-temperature soft water at 72-78 ℃, and discharging the condensed water into a condensed water pool;
when the pressure in the autoclave is reduced to 0.1Mpa, the discharge of residual steam becomes slow and difficult along with the lower pressure, at the moment, the aspirator opens high-temperature high-pressure steam, the aspirator absorbs low-pressure residual steam and normal-pressure residual steam through high-temperature high-pressure steam injection, the residual steam in the autoclave is continuously sucked, and is combined into hot steam, and the hot steam is sent to the heater and the soft water at 60-65 ℃ for mixed heating to generate the soft water at 72-78 ℃ until the pressure in the autoclave is reduced to zero, so that the residual steam in the autoclave is sucked and cleaned.
As a more preferable embodiment, the step S3 specifically includes: the river water enters a soft water tank after softening treatment, the water temperature of the soft water in summer and autumn is 27 ℃, the soft water is pumped to a boiler condenser for heat exchange through deoxidization, the temperature of the soft water is increased to 45 ℃, and the temperature of flue gas at the other side of the boiler condenser is reduced to 56 ℃ and is discharged through a chimney; continuously delivering soft water at 45 ℃ to a heat exchanger for heat exchange, wherein the temperature of the soft water is raised to 62 ℃, pumping 95 ℃ condensed water in a condensed water pool by a hot water pump at the other side of the heat exchanger for exchange with soft water at 45 ℃, and discharging the condensed water to a wastewater recovery pool after the temperature of the condensed water is lowered to 47 ℃; soft water at 62 ℃ is continuously sent to a heater, and the residual steam, flash steam and hot steam are subjected to steam-water mixing heating to generate high-temperature soft water at 75 ℃;
Correspondingly, the step S4 specifically includes:
the high-temperature soft water at 75 ℃ is sent to a boiler deaerator from a heater by a high-temperature water return pump, is heated to 102 ℃ by high-temperature high-pressure steam to deoxidize, is pumped by a boiler water supply pump to exchange heat with hot flue gas of the boiler, and after heat exchange, the temperature of the soft water at 102 ℃ is increased to 130 ℃ and enters the boiler to generate high-temperature high-pressure steam at 1.0Mpa/180 ℃.
Correspondingly, the step S2 specifically includes:
when the autoclave is inverted, 0.3Mpa residual steam and high-temperature condensed water still remain in the autoclave, the residual steam is discharged firstly, the residual steam is conveyed into a heater by pressure, and the residual steam and the soft water at 62 ℃ are mixed and heated to generate 75 ℃ high-temperature soft water;
when the pressure in the autoclave is reduced to 0.2Mpa, discharging high-temperature condensed water, performing steam-water separation on the high-temperature condensed water through a flash steam and condensed water, sending the flash steam to a heater, mixing and heating the flash steam with soft water at 62 ℃ to generate high-temperature soft water at 75 ℃, and discharging the condensed water into a condensed water pool;
when the pressure in the autoclave is reduced to 0.1Mpa, the discharge of residual steam becomes slow and difficult along with the lower pressure, at the moment, the aspirator opens high-temperature high-pressure steam, the aspirator absorbs low-pressure residual steam and normal-pressure residual steam through high-temperature high-pressure steam injection, the residual steam in the autoclave is continuously sucked, and is combined into hot steam, and the hot steam is sent to the heater and the soft water at 62 ℃ together to be mixed and heated to generate the soft water at 75 ℃ until the pressure in the autoclave is reduced to zero, so that the residual steam in the autoclave is sucked and cleaned.
It can be appreciated that the autoclave of this embodiment includes a plurality of autoclaves, and the pressure relief of the autoclaves is staggered in order to form a continuous discharge and recovery process of residual steam and high-temperature condensate.
Practical application
The invention is applied to 7 phi 3.2 multiplied by 25 m autoclaves and a 25 ton/hour natural gas boiler system, and the operation theory calculation and the measured data are consistent with each other: the average steam load is 20t/h, the soft water temperature is increased by 30-35 ℃, and the heat quantity Q=20t×1000kg/t×30deg.C×1kcal/deg.C.kg=6x105 Kcal per hour is equivalent to natural gas A=600000/8500=70M per hour 3 The natural gas price is 4.8 yuan/M 3 The daily recovery benefit is 70M 3 t.times.24hX4.8 yuan/M 3 8064 yuan, the recovery benefit per month 8064 yuan/day x 26 days = 20.97 ten thousand yuan.
The operation electric charge and the high-temperature and high-pressure steam charge consumed by the aspirator are deducted in each month for 4.97 ten thousand yuan, and the actual monthly saving of 20.97-4.97=16 ten thousand yuan can be realized, and the annual saving of 16 ten thousand yuan/month×12 months=192 ten thousand yuan.
It can be seen that the energy-saving effect is remarkable.
The foregoing disclosure is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, as it is understood by those skilled in the art that all or part of the above-described embodiments may be practiced without resorting to the equivalent thereof, which is intended to fall within the scope of the invention as defined by the appended claims.
Claims (10)
1. The energy-saving system for comprehensively utilizing the waste heat of the autoclaves and the boilers comprises the autoclaves and the boilers for providing high-temperature and high-pressure steam for the autoclaves, and is characterized by further comprising a boiler energy saver, a boiler condenser, an aspirator, a flash tank, a heat exchanger, a heater, a condensation water tank, a boiler deaerator, a soft water tank, a deaeration pump, a boiler feed pump, a hot water pump and a high-temperature water return pump;
the residual steam discharging port of the autoclave is connected with the suction inlet of the aspirator through a pipeline, the output port of the aspirator is communicated with the heater through a pipeline, and the residual steam discharged from the autoclave is conveyed into the heater through the aspirator; the high-temperature condensed water discharge port of the autoclave is communicated with the flash tank through a pipeline, the high-temperature condensed water discharged in the autoclave is subjected to steam-water separation through the flash tank to generate flash steam and condensed water, the flash steam is conveyed into the heater through the aspirator through a pipeline connected between the flash steam discharge port of the flash tank and the suction inlet of the aspirator, and the condensed water is discharged into the condensed water tank through a pipeline connected between the condensed water discharge port of the flash tank and the input end of the condensed water tank; the output end of the condensation water tank is communicated with one side of the heat exchanger through the hot water pump, condensed water in the condensation water tank enters the heat exchanger for exchange under the pumping of the hot water pump, and cooled condensed water is discharged to the wastewater recovery tank;
The fuel gas or fuel is combusted in a hearth of the boiler, and hot flue gas flows through the boiler economizer and the boiler condenser to be discharged from a chimney; the soft water entering the soft water tank is pumped to a boiler condenser through the deoxidizing pump to exchange heat with hot flue gas, the heated soft water is sent to the other side of the heat exchanger to exchange heat with the condensed water, and the heated soft water is continuously sent to the heater and is mixed with residual steam, flash steam and hot steam sent to the heater to be heated to generate high-temperature soft water; the high-temperature soft water is sent to the boiler deaerator from the heater through the high-temperature water return pump, is heated in the boiler deaerator through high-temperature and high-pressure steam input to the boiler deaerator to deoxidize, is pumped to the boiler energy-saving device through the boiler water supply pump to exchange heat with hot flue gas, and the water temperature of the soft water after heat exchange is increased and then enters the boiler to generate the high-temperature and high-pressure steam;
the high-temperature high-pressure steam generated by the boiler is conveyed into the boiler deaerator through a pipeline on one hand, and is conveyed into the sub-cylinder through a pipeline on the other hand, a first steam outlet of the sub-cylinder is connected with a high-temperature high-pressure steam input port of the autoclave, and a second steam outlet of the sub-cylinder is connected with a high-temperature high-pressure steam input port of the aspirator.
2. The energy saving system for comprehensive utilization of waste heat of autoclaves and boilers as claimed in claim 1, wherein:
after the river water is softened, the river water enters a soft water tank, the water temperature in summer and autumn is 25-30 ℃, the water is pumped to a boiler condenser for heat exchange through deoxidization, the temperature of the soft water is increased to 42-48 ℃, the temperature of flue gas at the other side of the boiler condenser is reduced to 53-59 ℃, and the flue gas is discharged through a chimney; soft water at 42-48 ℃ is continuously sent to a heat exchanger for heat exchange, the temperature of the soft water is increased to 60-65 ℃, condensed water at 92-98 ℃ of a condensed water pool is pumped by a hot water pump at the other side of the heat exchanger for exchange with soft water at 42-48 ℃, and the condensed water is discharged to a wastewater recovery pool after the temperature of the condensed water is reduced to 44-50 ℃; soft water at 60-65 ℃ is continuously sent to a heater and residual steam, flash steam and hot steam are mixed and heated to generate high-temperature soft water at 72-78 ℃; the high-temperature soft water with the temperature of 72 ℃ to 78 ℃ is sent to a boiler deaerator from a heater by a high-temperature water return pump, is heated to 100 ℃ to 105 ℃ by high-temperature high-pressure steam to deoxidize, is sent to a boiler energy saver by a boiler water supply pump to exchange heat with hot flue gas of the boiler, and after heat exchange, the temperature of the soft water with the temperature of 100 ℃ to 105 ℃ is increased to 127 ℃ to 133 ℃ and enters the boiler to generate the high-temperature high-pressure steam with the temperature of 1.0Mpa/180 ℃.
3. The energy saving system for comprehensive utilization of waste heat of autoclaves and boilers as claimed in claim 2, wherein:
the river water enters a soft water tank after softening treatment, the water temperature of the soft water in summer and autumn is 27 ℃, the soft water is pumped to a boiler condenser for heat exchange through deoxidization, the temperature of the soft water is increased to 45 ℃, and the temperature of flue gas at the other side of the boiler condenser is reduced to 56 ℃ and is discharged through a chimney; continuously delivering soft water at 45 ℃ to a heat exchanger for heat exchange, wherein the temperature of the soft water is increased to 62 ℃, pumping 95 ℃ condensed water in a condensed water pool by a hot water pump at the other side of the heat exchanger for exchange with soft water at 45 ℃, and discharging the condensed water to a wastewater recovery pool after the temperature of the condensed water is reduced to 47 ℃; soft water at 62 ℃ is continuously sent to a heater, and the residual steam, flash steam and hot steam are subjected to steam-water mixing heating to generate high-temperature soft water at 75 ℃; the high-temperature soft water at 75 ℃ is sent to a boiler deaerator from a heater by a high-temperature water return pump, is heated to 102 ℃ by high-temperature high-pressure steam to deoxidize, is pumped by a boiler water supply pump to exchange heat with hot flue gas of the boiler, and after heat exchange, the temperature of the soft water at 102 ℃ is increased to 130 ℃ and enters the boiler to generate high-temperature high-pressure steam at 1.0Mpa/180 ℃.
4. The energy saving system for comprehensive utilization of waste heat of autoclaves and boilers as claimed in claim 2, wherein:
When the autoclave is inverted, 0.3Mpa residual steam and high-temperature condensed water still remain in the autoclave, the residual steam is discharged firstly, the residual steam is conveyed into a heater by pressure, and the residual steam and soft water at 60-65 ℃ are mixed and heated to generate high-temperature soft water at 72-78 ℃;
when the pressure in the autoclave is reduced to 0.2Mpa, discharging high-temperature condensed water, performing steam-water separation on the high-temperature condensed water through a flash steam and condensed water, mixing and heating the flash steam to a heater and soft water at 60-65 ℃ to generate high-temperature soft water at 72-78 ℃, and discharging the condensed water into a condensed water pool;
when the pressure in the autoclave is reduced to 0.1Mpa, the discharge of residual steam becomes slow and difficult along with the lower pressure, at the moment, the aspirator opens high-temperature high-pressure steam, the aspirator absorbs low-pressure residual steam and normal-pressure residual steam through high-temperature high-pressure steam injection, the residual steam in the autoclave is continuously sucked, and is combined into hot steam, and the hot steam is sent to the heater and the soft water at 60-65 ℃ for mixed heating to generate the soft water at 72-78 ℃ until the pressure in the autoclave is reduced to zero, so that the residual steam in the autoclave is sucked and cleaned.
5. The energy-saving system for comprehensive utilization of waste heat of autoclaves and boilers according to claim 3, wherein:
When the autoclave is inverted, 0.3Mpa residual steam and high-temperature condensed water still remain in the autoclave, the residual steam is discharged firstly, the residual steam is conveyed into a heater by pressure, and the residual steam and the soft water at 62 ℃ are mixed and heated to generate 75 ℃ high-temperature soft water;
when the pressure in the autoclave is reduced to 0.2Mpa, discharging high-temperature condensed water, performing steam-water separation on the high-temperature condensed water through a flash steam and condensed water, sending the flash steam to a heater, mixing and heating the flash steam with soft water at 62 ℃ to generate high-temperature soft water at 75 ℃, and discharging the condensed water into a condensed water pool;
when the pressure in the autoclave is reduced to 0.1Mpa, the discharge of residual steam becomes slow and difficult along with the lower pressure, at the moment, the aspirator opens high-temperature high-pressure steam, the aspirator absorbs low-pressure residual steam and normal-pressure residual steam through high-temperature high-pressure steam injection, the residual steam in the autoclave is continuously sucked, and is combined into hot steam, and the hot steam is sent to the heater and the soft water at 62 ℃ together to be mixed and heated to generate the soft water at 75 ℃ until the pressure in the autoclave is reduced to zero, so that the residual steam in the autoclave is sucked and cleaned.
6. The energy-saving system for comprehensive utilization of waste heat of an autoclave and a boiler according to claim 1, wherein a plurality of spray heads, fillers and distribution pipes are arranged in the heater, the spray heads are communicated with a pipeline for inputting soft water, and the spray heads are arranged above the fillers; the distribution pipe is communicated with a pipeline for inputting the residual steam, the flash steam and the hot steam, and is arranged below the filler; and after the soft water sprayed out by the spray header passes through the filler, the soft water is mixed with residual steam, flash steam and hot steam entering the distribution pipe for steam-water heating, so that high-temperature soft water is generated.
7. The energy saving system for comprehensive utilization of waste heat of autoclaves and boilers according to any one of claims 1 to 6, wherein the autoclaves comprise a plurality of autoclaves, and pressure relief of the autoclaves is staggered in order to form continuous discharge and recovery processes of residual steam and high-temperature condensate;
the high-temperature high-pressure steam generated by the boiler is conveyed to a steam curing pool and a steam using section for drying through a pipeline;
the pipeline is respectively provided with a switch valve for opening or closing the circulation of water/gas on the pipeline.
8. An energy-saving method for comprehensively utilizing waste heat of an autoclave and a boiler is characterized by comprising the following steps:
s1, burning fuel gas or fuel in a hearth of a boiler, discharging hot flue gas from a chimney through an energy saver of the boiler and a condenser of the boiler, and respectively sending high-temperature and high-pressure steam generated by the boiler into an autoclave, an aspirator and a boiler deaerator, wherein the high-temperature and high-pressure steam sent into the autoclave is cooled into high-temperature condensate through heat exchange;
s2, conveying residual steam discharged from the autoclave to the heater through the aspirator, separating steam from water by high-temperature condensed water discharged from the autoclave through a flash tank, generating flash steam and condensed water, conveying the flash steam to the heater through the aspirator, discharging the condensed water into a condensed water tank, and discharging the condensed water discharged into the condensed water tank to one side of a heat exchanger for exchange under the pumping of a hot water pump, wherein the cooled condensed water is discharged into a wastewater recovery tank;
S3, delivering the soft water entering the soft water tank to the boiler condenser through a deoxidizing pump to exchange heat with hot flue gas, delivering the heated soft water to the other side of the heat exchanger to exchange heat with the condensed water, and delivering the heated soft water to the heater to be mixed with residual steam, flash steam and hot steam delivered to the heater for steam-water heating to generate high-temperature soft water;
s4, conveying the high-temperature soft water to a boiler deaerator from a heater through a high-temperature water return pump, heating the boiler deaerator by high-temperature and high-pressure steam input to the boiler deaerator to deoxidize the high-temperature soft water, pumping the high-temperature soft water to the boiler energy-saving device through a boiler water supply pump to exchange heat with hot flue gas, and lifting the water temperature of the soft water after heat exchange and then enabling the soft water to enter the boiler to generate the high-temperature and high-pressure steam.
9. The energy saving method for comprehensive utilization of waste heat of autoclaves and boilers as recited in claim 8, wherein said step S3 specifically includes:
the river water enters a soft water tank after softening treatment, the water temperature of the soft water in summer and autumn is 27 ℃, the soft water is pumped to a boiler condenser for heat exchange through deoxidization, the temperature of the soft water is increased to 45 ℃, and the temperature of flue gas at the other side of the boiler condenser is reduced to 56 ℃ and is discharged through a chimney; continuously delivering soft water at 45 ℃ to a heat exchanger for heat exchange, wherein the temperature of the soft water is increased to 62 ℃, pumping 95 ℃ condensed water in a condensed water pool by a hot water pump at the other side of the heat exchanger for exchange with soft water at 45 ℃, and discharging the condensed water to a wastewater recovery pool after the temperature of the condensed water is reduced to 47 ℃; soft water at 62 ℃ is continuously sent to a heater, and the residual steam, flash steam and hot steam are subjected to steam-water mixing heating to generate high-temperature soft water at 75 ℃;
The step S4 specifically includes:
the high-temperature soft water at 75 ℃ is sent to a boiler deaerator from a heater by a high-temperature water return pump, is heated to 102 ℃ by high-temperature high-pressure steam to deoxidize, is pumped by a boiler water supply pump to exchange heat with hot flue gas of the boiler, and after heat exchange, the temperature of the soft water at 102 ℃ is increased to 130 ℃ and enters the boiler to generate high-temperature high-pressure steam at 1.0Mpa/180 ℃.
10. The energy saving method for comprehensive utilization of waste heat of autoclaves and boilers as recited in claim 9, wherein said step S2 specifically includes:
when the autoclave is inverted, 0.3Mpa residual steam and high-temperature condensed water still remain in the autoclave, the residual steam is discharged firstly, the residual steam is conveyed into a heater by pressure, and the residual steam and the soft water at 62 ℃ are mixed and heated to generate 75 ℃ high-temperature soft water;
when the pressure in the autoclave is reduced to 0.2Mpa, discharging high-temperature condensed water, performing steam-water separation on the high-temperature condensed water through a flash steam and condensed water, sending the flash steam to a heater, mixing and heating the flash steam with soft water at 62 ℃ to generate high-temperature soft water at 75 ℃, and discharging the condensed water into a condensed water pool;
when the pressure in the autoclave is reduced to 0.1Mpa, the discharge of residual steam becomes slow and difficult along with the lower pressure, at the moment, the aspirator opens high-temperature high-pressure steam, the aspirator absorbs low-pressure residual steam and normal-pressure residual steam through high-temperature high-pressure steam injection, the residual steam in the autoclave is continuously sucked, and is combined into hot steam, and the hot steam is sent to the heater and the soft water at 62 ℃ together to be mixed and heated to generate the soft water at 75 ℃ until the pressure in the autoclave is reduced to zero, so that the residual steam in the autoclave is sucked and cleaned.
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| CN202048560U (en) * | 2011-05-05 | 2011-11-23 | 湖南建华管桩有限公司 | Waste heat recovery system of boiler and still kettle |
| CN109695484A (en) * | 2018-05-21 | 2019-04-30 | 陈建文 | A kind of tubular pole residual neat recovering system |
| CN209039239U (en) * | 2018-10-30 | 2019-06-28 | 付晓飞 | A kind of waste gas heat utilization energy-saving environmental protection device |
| CN209926337U (en) * | 2019-03-18 | 2020-01-10 | 新乡市华丰环保机械设备有限公司 | Still kettle steam heat energy recovery system |
| CN110715286A (en) * | 2019-11-22 | 2020-01-21 | 贵州迪森元能源科技有限公司 | Still kettle and boiler heat energy recovery system |
| CN215702680U (en) * | 2021-03-04 | 2022-02-01 | 贵州迪森元能源科技有限公司 | Cascade utilization system for heat of still kettle |
| CN114777097A (en) * | 2022-05-05 | 2022-07-22 | 南京旭建新型建材股份有限公司 | Recovery steam production system for efficiently utilizing pressure-reduced residual steam of still kettle and energy-saving emission-reducing process |
-
2022
- 2022-12-27 CN CN202211682855.8A patent/CN116045266B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202048560U (en) * | 2011-05-05 | 2011-11-23 | 湖南建华管桩有限公司 | Waste heat recovery system of boiler and still kettle |
| CN109695484A (en) * | 2018-05-21 | 2019-04-30 | 陈建文 | A kind of tubular pole residual neat recovering system |
| CN209039239U (en) * | 2018-10-30 | 2019-06-28 | 付晓飞 | A kind of waste gas heat utilization energy-saving environmental protection device |
| CN209926337U (en) * | 2019-03-18 | 2020-01-10 | 新乡市华丰环保机械设备有限公司 | Still kettle steam heat energy recovery system |
| CN110715286A (en) * | 2019-11-22 | 2020-01-21 | 贵州迪森元能源科技有限公司 | Still kettle and boiler heat energy recovery system |
| CN215702680U (en) * | 2021-03-04 | 2022-02-01 | 贵州迪森元能源科技有限公司 | Cascade utilization system for heat of still kettle |
| CN114777097A (en) * | 2022-05-05 | 2022-07-22 | 南京旭建新型建材股份有限公司 | Recovery steam production system for efficiently utilizing pressure-reduced residual steam of still kettle and energy-saving emission-reducing process |
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| CN116045266B (en) | 2023-08-08 |
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