CN107796237A - negative pressure steam heating method and system - Google Patents
negative pressure steam heating method and system Download PDFInfo
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- CN107796237A CN107796237A CN201711243579.4A CN201711243579A CN107796237A CN 107796237 A CN107796237 A CN 107796237A CN 201711243579 A CN201711243579 A CN 201711243579A CN 107796237 A CN107796237 A CN 107796237A
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- negative pressure
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- pressure steam
- steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/06—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using air or other gas as the cooling medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/10—Auxiliary systems, arrangements, or devices for extracting, cooling, and removing non-condensable gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
It the present invention relates to the use of the method and system of steam heated material.Methods described comprises the following steps：Fluid is passed through to the tube side of First Heat Exchanger, steam is passed through to the shell side of First Heat Exchanger, the fluid and the steam heat exchange occurs in First Heat Exchanger；The fluid of heating obtains vapour phase negative pressure steam into vapor-liquid separation tank through vapor-liquid separation；The vapour phase negative pressure steam is passed through the shell side of the second heat exchanger, material to be heated is passed through the tube side of the second heat exchanger, heat exchange occurs in second heat exchanger for the vapour phase negative pressure steam and the material to be heated, and extracts the incoagulable gas in the second heat exchanger out with gas control equipment.Technical solution of the present invention can make the heating even running of negative pressure steam and accurately automatically control, and the efficiency of heating surface is high, energy consumption is low, can solve the problems, such as currently to heat heat-sensitive substance.
Description
Technical field
The present invention relates to chemical field, more particularly to a kind of method and system using steam heated material.
Background technology
At present people handle heat sensitive material heating when generally use be hot water heating or negative pressure steam heating.Heat
The shortcomings that water heats is that energy consumption is big, heat transfer efficiency is low.Also have using the steam-heated mode of negative pressure, but for negative pressure steam
The parameters such as pressure, temperature, heating amount can not reach the effect more accurately controlled, and heat-sensitive substance is easy to because being heated
The change of condition and there is the situation such as high-temperature oxydation, carbonization, rotten.
The content of the invention
For this reason, it may be necessary to provide it is a kind of to the heating of negative pressure steam can even running and accurately automatically control, the efficiency of heating surface it is high,
The low negative pressure steam heating method of energy consumption and system, to solve the problems, such as currently to heat heat-sensitive substance.
To achieve the above object, a kind of negative pressure steam heating method is inventor provided, is comprised the following steps：
Fluid is passed through to the tube side of First Heat Exchanger, steam is passed through to the shell side of First Heat Exchanger, the fluid and
In First Heat Exchanger heat exchange occurs for the steam；
The fluid of heating obtains vapour phase negative pressure steam into vapor-liquid separation tank through vapor-liquid separation；
The vapour phase negative pressure steam is passed through the shell side of the second heat exchanger, and material to be heated is passed through the tube side of the second heat exchanger,
In second heat exchanger heat exchange occurs for the vapour phase negative pressure steam and the material to be heated, and uses gas control equipment
Extract the incoagulable gas in the second heat exchanger out.
Further, described negative pressure steam heating method also includes step：The temperature of the vapour phase negative pressure steam is monitored,
And control into first and change according to the temperature of the vapour phase negative pressure steam measured and the deviation situation of default vapour phase negative pressure vapor (steam) temperature
The flow of the steam of hot device.
Further, described negative pressure steam heating method also includes step：Second heat exchanger exit is monitored through adding
The temperature of material after heat, and according to the temperature for measuring heated rear material and the deviation situation control of default heated rear temperature of charge
The height of liquid level of the second heat exchanger condensed water is made, to change the heat exchange area of the second heat exchanger.
Further, described negative pressure steam heating method also includes step：The pressure value of vapor-liquid separation tank is monitored with bearing
The temperature of steam is pressed, and according under the pressure value of measured vapor-liquid separation tank and measured negative pressure vapor (steam) temperature respective conditions
The uninterrupted for the incoagulable gas that the deviation situation control of theoretical pressure is extracted out from the second heat exchanger.
Further, in described negative pressure steam heating method, in the second heat exchanger with gas control equipment extraction
Incoagulable gas obtains partial condensation liquid stream after condenser and enters receiving tank, remaining incoagulable gas discharge, receiving tank with it is cold
Pressure balance is kept by pressure equaliser between condenser.
Further, described negative pressure steam heating method also includes step：Monitor the level value of vapor-liquid separation tank, and root
It is fresh according to the deviation situation of measured vapor-liquid separation tank level value and default vapor-liquid separation tank level value control vapor-liquid separation tank
Water adds uninterrupted.
Inventor also proposed a kind of negative pressure steam-heating system, for realizing that the negative pressure steam described in claim 1 adds
Hot method, including First Heat Exchanger, vapor-liquid separation tank, the second heat exchanger and gas control equipment；
The tube side of the First Heat Exchanger connects with the vapor-liquid separation tank；The vapor phase exit of the vapor-liquid separation tank and
The shell side connection of two heat exchangers；The gas control equipment is used to extract the incoagulable gas in the second heat exchanger out.
Further, in described negative pressure steam-heating system, the vapor-liquid separation tank is used provided with the first temperature sensor
In the temperature of measure vapour phase negative pressure steam；The First Heat Exchanger is connected with steam volume control device, first temperature
Information transmission is carried out by the first feedback device between sensor and the steam volume control device.
Further, in described negative pressure steam-heating system, second heat exchanger exit is connected with second temperature sensing
Device, the temperature of the heated material for determining second heat exchanger exit, second heat exchanger are connected with condensation aqueous
Level control device, carried out between the second temperature sensor and the condensed water fluid level control device by the second feedback device
Information transmission.
Further, in described negative pressure steam-heating system, the vapor-liquid separation tank is provided with pressure sensor, the pressure
Information transmission is carried out by the 3rd feedback device between force snesor and the gas control equipment.
Further, in described negative pressure steam-heating system, in addition to condenser, taken out for condensed gas control device
Incoagulable gas in the second heat exchanger gone out；Also include being used for the receiving tank for receiving condensation gained condensate liquid, the receiving tank
Pressure equaliser is provided between condenser.
Further, in described negative pressure steam-heating system, in addition to liquid level sensor, fresh water controller and
Four feedback devices, the liquid level sensor is arranged at vapor-liquid separation tank and the level value for monitoring vapor-liquid separation tank, described new
Fresh water controller is connected to vapor-liquid separation tank, passes through described between the liquid level sensor and the fresh water controller
Four feedback devices carry out information transmission.
Prior art is different from, above-mentioned technical proposal has the following advantages that：It can automate and accurately control to heat sensitive material
Heating process, the efficiency of heating surface is high, energy consumption is low.
Brief description of the drawings
Fig. 1 is a kind of structural representation of negative pressure steam-heating system of the present embodiment.
Description of reference numerals：
1- First Heat Exchangers
2- steam volume control devices
3- vapor-liquid separation tanks
The temperature sensors of 4- first
5- pressure sensors
6- condensed water fluid level control devices
The heat exchangers of 7- second
8- second temperature sensors
9- gas control equipments
10- liquid level sensors
11- condensers
12- receiving tanks
13- pressure equalisers
14- surge tanks
15- fresh water replenishment control devices
16- vapor-liquid separation tank level indicators
17- vacuum plants
Embodiment
To describe the technology contents of technical scheme, construction feature, the objects and the effects in detail, below in conjunction with specific reality
Apply example and coordinate accompanying drawing to be explained in detail.
1 is referred to, is a kind of structural representation of negative pressure steam-heating system provided by the present invention.The negative pressure steam
Heating system mainly includes First Heat Exchanger 1, vapor-liquid separation tank 3, the second heat exchanger 7 and gas control equipment 9；Described first changes
The tube side of hot device 1 connects with the vapor-liquid separation tank 3；The shell side of the vapor phase exit of the vapor-liquid separation tank 3 and the second heat exchanger 7
Connection；The gas control equipment 9 is used to extract the incoagulable gas in the second heat exchanger out.
The structure of First Heat Exchanger 1 includes shell side and tube side two spaces, and steam and tube side are passed through in shell side
Cold fluid carries out heat exchange, and steam discharges converting heat and discharged for condensed water.Cold fluid absorbs converting heat and mixed for vapour-liquid
Compound enters vapor-liquid separation tank 3, and vapour phase negative pressure steam is then separated in vapor-liquid separation tank 3, and then negative pressure steam enters
The shell side of second heat exchanger 7, the heating source as the material to be heated of the tube side of the second heat exchanger 7.In the second heat exchanger 7, bear
After pressing steam and material to be heated to carry out heat exchange, negative pressure steam release converting heat is condensed water with being pumped to vapor-liquid separation tank
3, cold material absorbs heat and is heated to be thermal material and exports discharge by the second heat exchanger 7, so as to complete by mild heat
Process.
Further, in the present embodiment, in described negative pressure steam-heating system, the vapor-liquid separation tank 3 is provided with
First temperature sensor 4 is used for the temperature for determining vapour phase negative pressure steam；The First Heat Exchanger 1 is connected with the control of steam flow
Device 2, carried out between first temperature sensor 4 and the steam volume control device 2 by the first feedback device
Information transmission.In other embodiment, the first feedback device can be integrated in the first temperature sensor 4 or the pressure
Steam flow control 2 to realize information transmission and control action, or, the first feedback device can also be one and first
Temperature sensor 4 and the independent controlling organization of 2 equal existence information of steam volume control device transmission connection.Such first
Feedback device can be realized according to negative pressure vapor (steam) temperature and to the Automated condtrol of steam flow, and passes through steam stream
The regulation of amount, the stabilization of negative pressure vapor (steam) temperature is able to maintain that, improves steam utilization, contribute to whole negative pressure steam-heating system
Even running.
Further, in the present embodiment, in described negative pressure steam-heating system, second heat exchanger 7 exports
Second temperature sensor 8 is connected with, the temperature of the heated material exported for determining second heat exchanger 7, described second changes
Hot device 7 is provided with condensed water fluid level control device 6, between the second temperature sensor 8 and the condensed water fluid level control device 6
Information transmission is carried out by the second feedback device.In some embodiments, the second feedback device can be integrated in second temperature
Sensor 8 or the condensed water fluid level control device 6 are to realize information transmission and control function, in other embodiment
In, the second feedback device can also be one and be passed with second temperature sensor 8 and 6 equal existence information of condensed water fluid level control device
The independent controlling organization of defeated connection.Such second feedback device can be realized to be gone out according to completion is heated from the second heat exchanger
Mouthful discharge material temperature and treat condensed water liquid level and (be effectively equivalent to treat the heating surface (area) (HS of heated material, certain journey
Also correspond to treat the heating load of heated material on degree) Automated condtrol.In present embodiment, the second heat exchanger 7 is provided with
Liquid level sensor 10, there is also information biography for the feedback device of liquid level sensor 10 and second or condensed water fluid level control device 6
Defeated relation, the liquid level detected by liquid level sensor 10 can essentially be equivalent to learning negative pressure steam and material to be heated
Heat exchange area size situation, the underheat of material to be heated can be not only avoided, the overheat of material to be heated can also be avoided
High-temperature oxydation, carbonization, polymerization iso-metamorphism situation caused by heating occur.
Further, in described negative pressure steam-heating system, the vapor-liquid separation tank 3 is provided with pressure sensor 5 and the
One temperature sensor 4, for detecting the pressure value of vapor-liquid separation tank 3 and the temperature of negative pressure steam, the pressure sensor 5,
Information transmission is carried out by the 3rd feedback device between one temperature sensor 4 and the gas control equipment 9.In some embodiment party
In formula, the 3rd feedback device can be integrated in pressure sensor 5 or the gas control equipment 9, in other embodiment
In, the 3rd feedback device can also be one to be existed with the first temperature sensor 4, pressure sensor 5 and gas control equipment 9
The independent controlling organization of information transfer connection.Such 3rd feedback device can carry out the pressure according to the negative pressure steam detected
The deviation between theoretical pressure under force value and negative pressure vapor (steam) temperature respective conditions and by entering to the extraction flow of on-condensible gas
Row control, so as to realizing the Automated condtrol of negative pressure steam pressure.In some embodiments, the gas control equipment 9 can
To be vavuum pump.In other embodiment, the gas control equipment can also be other controllable gas flows or
The equipment such as the gas pump of flow velocity.Control incoagulable gas uninterrupted can ensure negative pressure steam stable, there is provided stable heating
Load, ensure the even running of negative pressure steam-heating system.
Further, described negative pressure steam-heating system also includes condenser 11, is taken out for condensed gas control device
Incoagulable gas in the second heat exchanger 7 gone out；Also include being used for the receiving tank 12 for receiving condensation gained condensate liquid, the reception
Pressure equaliser 13 is provided between tank 12 and condenser 11.Condensed water recycles in system.Incoagulable gas quilt
After gas control equipment 9 is extracted out, first circulating water condensing in condensed device 11, then condensed water flow into receiving tank 12, remaining does not coagulate
Property gas can again pass through as Vacuum exhaust tube it is isostructural effect and discharge.Pressure equaliser 13 is balance in present embodiment
Pipe, purposes are to maintain pressure balance between receiving tank 12 and condenser 11, and condensed water can smoothly flow into receiving tank 12, in other realities
The other structures that same purpose can be achieved can also be used by applying in mode.
Further, described vapor-liquid separation tank 3 is provided with vapor-liquid separation tank level indicator 16, for detecting vapor-liquid separation
The liquid level of tank 3；The vapor-liquid separation tank 3 is connected with fresh water replenishment control device 15；The vapor-liquid separation tank level indicator 16
Information transmission is carried out by the 4th feedback device with fresh water replenishment control device 15.In some embodiments, the 4th feedback
Device can be integrated in vapor-liquid separation tank level indicator 16 or the fresh water replenishment control device 15, implement in other
In mode, the 4th feedback device can also be one and vapor-liquid separation tank level indicator 16 and fresh water replenishment control device 15
The independent controlling organization of equal existence information transmission connection.Such 4th feedback device can be according to the vapor-liquid separation tank detected
3 level value and be controlled by adding flow to fresh water, so as to realize the Automated condtrol of the liquid level of vapor-liquid separation tank 3,
Ensure the level stability of vapor-liquid separation tank 3, so as to ensure the even running of negative pressure steam-heating system.
In present embodiment, the surge tank 14 is also connected with vacuum plant 17, for controlling the pressure of surge tank.
Compared to prior art, the negative pressure steam-heating system that embodiment of the present invention is provided can accurately control temperature-sensitive
Material heating-up temperature, the negative pressure steam less than 100 DEG C is produced, can be according to different material as the heat source of heat sensitive material
Heating-up temperature demand, by controlling negative pressure steam pressure, according under different pressures produce negative pressure vapor (steam) temperature difference, control
The temperature of negative pressure steam, and by changing heating surface (area) (HS control to heat sensitive material heating amount, realize to heat sensitive material heating-up temperature
Accurate control.For overall operation effect, the heat transfer efficiency of steam is higher than hot water or deep fat, therefore improves production efficiency,
Operating cost is reduced, saves steam amount, heat utilization rate is improved, after steam heating reaches preset temperature, passes through control
The flow of pressing pressure steam maintains negative pressure vapor (steam) temperature, control pressure steam usage amount, improves steam utilization.Heat up process
For, heat it is gentle carry out, the temperature difference is small between negative pressure steam and heat sensitive material, in heat exchanger material by slow mild heat to default
Temperature, material can be avoided to occur high-temperature oxydation, polymerization, carbonization iso-metamorphism situation in heating process.In addition, system operation is steady
It is fixed, real-time monitoring system parameter, control parameters consistent with preset value using automatic control system, keep heating system stable
Operation, ensure that product quality indicator is stable.
Another embodiment of the present invention provides a kind of negative pressure steam heating method, comprises the following steps：
Fluid is passed through to the tube side of First Heat Exchanger 1, steam is passed through to the shell side of First Heat Exchanger 1, the fluid
Heat exchange occurs in First Heat Exchanger 1 with the steam；
Heated fluid obtains vapour phase negative pressure steam into vapor-liquid separation tank 3 through vapor-liquid separation；
The vapour phase negative pressure steam is passed through the shell side of the second heat exchanger 7, and material to be heated is passed through the pipe of the second heat exchanger 7
In second heat exchanger 7 heat exchange occurs for journey, the vapour phase negative pressure steam and the material to be heated, and is controlled with gas
Device 9 extracts the incoagulable gas in the second heat exchanger 7 out.
The structure of First Heat Exchanger 1 includes shell side and tube side two spaces, and steam and tube side are passed through in shell side
Cold fluid carries out heat exchange, and steam discharges converting heat and discharged for condensed water.It is hot fluid that cold fluid, which absorbs converting heat,
Into vapor-liquid separation tank 3, vapour phase negative pressure steam is then separated in vapor-liquid separation tank 3, then negative pressure steam enters second
The shell side of heat exchanger 7, the heating source as the material to be heated in the tube side of the second heat exchanger 7.In the second heat exchanger 7, negative pressure
After steam and material to be heated carry out heat exchange, negative pressure steam release converting heat is condensed water with being pumped to vapor-liquid separation tank 3,
Cold material absorbs heat and is heated to be thermal material and exports discharge by the second heat exchanger 7, so as to complete by the mistake of mild heat
Journey.
Further, in the negative pressure steam heating method, in addition to step：Monitor the temperature of the vapour phase negative pressure steam
Degree, and enter first according to the deviation situation control of the temperature and default vapour phase negative pressure vapor (steam) temperature of the vapour phase negative pressure steam measured
The flow of the steam of heat exchanger.In negative pressure steam-heating system for realizing the negative pressure steam heating method, vapour-liquid
Knockout drum 3 is provided with the temperature that the first temperature sensor 4 is used to monitor vapour phase negative pressure steam；The First Heat Exchanger 1 is connected with pressure
Steam flow control 2, pass through first between first temperature sensor 4 and the steam volume control device 2
Feedback device carries out information transmission.The automation control according to negative pressure vapor (steam) temperature and to steam flow can so be realized
System, and by the regulation of steam flow, the stabilization of negative pressure vapor (steam) temperature is able to maintain that, improves steam utilization, is contributed to
The even running of whole negative pressure steam-heating system.
Further, described negative pressure steam heating method also includes step：Monitor the warp that second heat exchanger 7 exports
The temperature of heated material, and controlled according to the temperature of the heated material measured and the deviation situation of default heated temperature of charge
The height of liquid level of the condensed water of second heat exchanger 7.For realizing the negative pressure steam of negative pressure steam heating method described in present embodiment
In heating system, the outlet of the second heat exchanger 7 is connected with second temperature sensor 8, is exported for determining second heat exchanger 7
Heated material temperature, second heat exchanger 7 is provided with condensed water fluid level control device 6, the second temperature sensor 8
Information transmission is carried out by the second feedback device between the condensed water fluid level control device 6.It can so realize according to quilt
Heating is completed and treats condensed water liquid level from the temperature of the material of the second heat exchanger exit discharge and (be effectively equivalent to to be added
The heating surface (area) (HS of thermal material, also correspond to treat the heating load of heated material in a way) Automated condtrol.Second changes
Hot device 7 is provided with liquid level sensor 10, and the liquid level sensor 10 is also deposited with the second feedback device or condensed water fluid level control device 6
In information transfer relation, the liquid level detected by liquid level sensor 10 can essentially equivalent to learn negative pressure steam with it is to be added
The heat exchange area size situation of thermal material, the underheat of material to be heated can be not only avoided, material to be heated can also be avoided
High-temperature oxydation, carbonization caused by the overheat heating of material, polymerization iso-metamorphism situation occur.
Further, the negative pressure steam heating method described in present embodiment also includes step：Monitor vapor-liquid separation tank 3
Pressure value and the temperature of negative pressure steam, and according to the pressure value bar corresponding with negative pressure vapor (steam) temperature of measured vapor-liquid separation tank 3
Incoagulable gas in the second heat exchanger 7 that the deviation situation control gas control equipment 9 of theoretical pressure under part is extracted out
Uninterrupted.The vapor-liquid separation tank 3 is provided with pressure sensor 5, the pressure sensor 5, the first temperature sensor 4 and institute
State and information transmission is carried out by the 3rd feedback device between gas control equipment 9.In some embodiments, the 3rd feedback device
Pressure sensor 5 or the gas control equipment 9, in other embodiment, the 3rd feedback device can be integrated in
Can be one and pressure sensor 5 and the independent controlling organization of 9 equal existence information of gas control equipment transmission connection.It is such
First feedback device can be carried out according to the pressure value of the negative pressure steam detected and by entering to the extraction flow of on-condensible gas
Row control, so as to realizing the Automated condtrol of negative pressure steam pressure.
Further, in described negative pressure steam heating method, also with the second heat exchanger of gas control equipment extraction
Incoagulable gas partial condensation liquid stream obtained after condenser enter receiving tank, the discharge of remaining incoagulable gas, receiving tank with
Pressure balance is kept by pressure equaliser between condenser.Condensed water recycles in system.Incoagulable gas quilt
After gas control equipment 9 is extracted out, first circulating water condensing in condensed device 11, then condensed water flow into receiving tank 12, remaining does not coagulate
Property gas can again pass through as Vacuum exhaust tube it is isostructural effect and discharge.Pressure equaliser 13 is balance in present embodiment
Pipe, purposes are to maintain pressure balance between receiving tank 12 and condenser 11, and condensed water can smoothly flow into receiving tank 12.
Further, described negative pressure steam heating method also includes step：The level value of vapor-liquid separation tank 3 is monitored, and
The benefit of fresh water is controlled according to the deviation situation of the level value of vapor-liquid separation tank 3 and the level value of default vapor-liquid separation tank 3 measured
Dosage；Described vapor-liquid separation tank 3 is provided with vapor-liquid separation tank level indicator 16, for detecting the liquid level of vapor-liquid separation tank 3；Institute
State vapor-liquid separation tank 3 and be connected with fresh water replenishment control device 15；The vapor-liquid separation tank level indicator 16 supplements with fresh water
Control device 15 carries out information transmission by the 4th feedback device.The liquid according to the vapor-liquid separation tank detected can so be realized
Place value and be controlled by adding flow to fresh water, so as to realize the Automated condtrol of vapor-liquid separation tank liquid level, ensure vapour
The level stability of liquid knockout drum 3, so as to ensure the even running of negative pressure steam-heating system.
Compared to prior art, the negative pressure steam-heating system that embodiment of the present invention is provided can accurately control temperature-sensitive
Material heating-up temperature, the negative pressure steam less than 100 DEG C is produced, can be according to different material as the heat source of heat sensitive material
Heating-up temperature demand, by controlling negative pressure steam pressure, according under different pressures produce negative pressure vapor (steam) temperature difference, control
The temperature of negative pressure steam, and by changing heating surface (area) (HS control to heat sensitive material heating amount, realize to heat sensitive material heating-up temperature
Accurate control.For overall operation effect, the heat transfer efficiency of steam is higher than hot water or deep fat, therefore improves production efficiency,
Operating cost is reduced, saves steam amount, heat utilization rate is improved, after steam heating reaches preset temperature, passes through control
The flow of pressing pressure steam maintains negative pressure vapor (steam) temperature, control pressure steam usage amount, improves steam utilization.Heat up process
For, heat it is gentle carry out, the temperature difference is small between negative pressure steam and heat sensitive material, in heat exchanger material by slow mild heat to default
Temperature, material can be avoided to occur high-temperature oxydation, polymerization, carbonization iso-metamorphism situation in heating process.In addition, system operation is steady
It is fixed, real-time monitoring system parameter, control parameters consistent with preset value using automatic control system, keep heating system stable
Operation, ensure that product quality indicator is stable.
It should be noted that although the various embodiments described above have been described herein, but not thereby limit
The scope of patent protection of the present invention.Therefore, based on the present invention innovative idea, to embodiment described herein carry out change and repair
Change, or the equivalent structure or equivalent flow conversion made using description of the invention and accompanying drawing content, directly or indirectly will be with
Upper technical scheme is used in other related technical areas, is included within the protection domain of patent of the present invention.
Claims (12)
1. a kind of negative pressure steam heating method, it is characterised in that comprise the following steps：
Fluid is passed through to the tube side of First Heat Exchanger, steam is passed through to the shell side of First Heat Exchanger, the fluid and described
In First Heat Exchanger heat exchange occurs for steam；
The fluid of heating obtains vapour phase negative pressure steam into vapor-liquid separation tank through vapor-liquid separation；
The vapour phase negative pressure steam is passed through the shell side of the second heat exchanger, and material to be heated is passed through the tube side of the second heat exchanger, described
In second heat exchanger heat exchange occurs for vapour phase negative pressure steam and the material to be heated, and is extracted out with gas control equipment
Incoagulable gas in second heat exchanger.
2. negative pressure steam heating method as claimed in claim 1, it is characterised in that also including step：The vapour phase is monitored to bear
Press the temperature of steam, and the deviation situation control of the temperature and default vapour phase negative pressure vapor (steam) temperature according to the vapour phase negative pressure steam measured
Flow of the system into the steam of First Heat Exchanger.
3. negative pressure steam heating method as claimed in claim 1 or 2, it is characterised in that also including step：Monitor described second
The temperature of material after heat exchanger exit is heated, and according to the temperature and default heated rear material temperature for measuring heated rear material
The deviation situation of degree controls the height of liquid level of the second heat exchanger condensed water.
4. the negative pressure steam heating method as described in claim 1,2 or 3, it is characterised in that also including step：Monitor vapour-liquid point
From the pressure value of tank and the temperature of negative pressure steam, and the pressure value according to measured vapor-liquid separation tank and measured negative pressure steam
The uninterrupted for the incoagulable gas that the deviation situation control of theoretical pressure under temperature respective conditions is extracted out from the second heat exchanger.
5. negative pressure steam heating method as claimed in claim 1 or 2, it is characterised in that the extracted out with gas control equipment
Incoagulable gas in two heat exchangers obtains partial condensation liquid stream after condenser and enters receiving tank, remaining incoagulable gas row
Go out, pressure balance is kept by pressure equaliser between receiving tank and condenser.
6. negative pressure steam heating method as claimed in claim 1 or 2, it is characterised in that also including step：Monitor vapor-liquid separation
The level value of tank, and controlled according to the deviation situation of measured vapor-liquid separation tank level value and default vapor-liquid separation tank level value
Vapor-liquid separation tank fresh water adds uninterrupted.
7. a kind of negative pressure steam-heating system, it is characterised in that for realizing the negative pressure steam heating side described in claim 1
Method, including First Heat Exchanger, vapor-liquid separation tank, the second heat exchanger and gas control equipment；
The tube side of the First Heat Exchanger connects with the vapor-liquid separation tank；The vapor phase exit of the vapor-liquid separation tank and second changes
The shell side connection of hot device；The gas control equipment is used to extract the incoagulable gas in the second heat exchanger out.
8. negative pressure steam-heating system as claimed in claim 7, it is characterised in that the vapor-liquid separation tank is provided with the first temperature
Sensor is used for the temperature for determining vapour phase negative pressure steam；The First Heat Exchanger is connected with steam volume control device, described
Information transmission is carried out by the first feedback device between first temperature sensor and the steam volume control device.
9. negative pressure steam-heating system as claimed in claim 7 or 8, it is characterised in that second heat exchanger exit is connected with
Second temperature sensor, the temperature of the heated material for determining second heat exchanger exit, second heat exchanger connect
Condensed water fluid level control device is connected to, passes through second between the second temperature sensor and the condensed water fluid level control device
Feedback device carries out information transmission.
10. the negative pressure steam-heating system as described in claim 7,8 or 9, it is characterised in that the vapor-liquid separation tank is provided with pressure
Force snesor, information transmission is carried out by the 3rd feedback device between the pressure sensor and the gas control equipment.
11. negative pressure steam-heating system as claimed in claim 7 or 8, it is characterised in that also including condenser, for condensing
Incoagulable gas in the second heat exchanger that gas control equipment is extracted out；Also include being used for the reception for receiving condensation gained condensate liquid
Tank, pressure equaliser is provided between the receiving tank and condenser.
12. negative pressure steam-heating system as claimed in claim 7 or 8, it is characterised in that also including liquid level sensor, fresh
Water controller and the 4th feedback device, the liquid level sensor are arranged at vapor-liquid separation tank and for monitoring vapor-liquid separation tank
Level value, the fresh water controller are connected to vapor-liquid separation tank, the liquid level sensor and the fresh water controller
Between pass through the 4th feedback device carry out information transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711243579.4A CN107796237A (en) | 2017-11-30 | 2017-11-30 | negative pressure steam heating method and system |
Applications Claiming Priority (1)
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| CN112973166A (en) * | 2019-12-17 | 2021-06-18 | 无锡弘鼎华化工设备有限公司 | Device and method for recovering sucralose neutralization solution solvent |
| CN112973166B (en) * | 2019-12-17 | 2024-04-30 | 无锡弘鼎华化工设备有限公司 | Device and method for recycling sucralose neutralization solution |
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Application publication date: 20180313 |