CN106196613B - A kind of hot-water boiler blowdown cool-down method and system - Google Patents
A kind of hot-water boiler blowdown cool-down method and system Download PDFInfo
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- CN106196613B CN106196613B CN201610592162.8A CN201610592162A CN106196613B CN 106196613 B CN106196613 B CN 106196613B CN 201610592162 A CN201610592162 A CN 201610592162A CN 106196613 B CN106196613 B CN 106196613B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/16—Arrangements for water drainage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
Abstract
The invention discloses a kind of hot-water boiler blowdown cool-down method and systems, to solve the problem of that sewage cooling system existing in the prior art lacks the residual heat resources waste that function of recovering waste heat causes boiler blow-off to generate.The present invention includes: the sewage that will be discharged from the effluent discharge outlet of hot-water boiler, is transmitted to the blow-off line being connected to effluent discharge outlet；The sewage of blow-off line will be entered, be successively transmitted to starting point, heat exchange department and the end of blow-off line, so that heat exchange occurs for the cold water being transmitted in the sewage and softening water tank of heat exchange department；Wherein, starting point is connected to effluent discharge outlet, and is laid between hot-water boiler and softening water tank, and heat exchange department is laid in softening water tank, and end is stretched out from softening water tank.The present invention heats the cold water in softening water tank using the waste heat of sewage in blow-off line, realizes the purpose of discharge after sewage cools down, sewage remaining energy recycling.
Description
Technical field
The present embodiments relate to field of communication technology more particularly to a kind of hot-water boiler blowdown cool-down method and systems.
Background technique
Boiler blow-off refers to that boiler drains the big furnace water of the big sum concentration containing grain slag of a part of salt concentration in operation.
The method of boiler blow-off traditional at present is: sewage being down to first to dirt using blowdown cooling tank or blowdown cooling tank
Water cooling, then the harmful components in sewage are removed, it is directly discharged in external environment after so that sewage is met discharge standard.
Being cooled down using blowdown cooling tank or blowdown cooling tank to sewage, cooling tank or cooling tank need biggish investment, and
And space occupied is big, there are no waste heat recovery measure is taken, causes the significant wastage of boiler blow-off residual heat resources.
To sum up, sewage cooling system in the prior art does not have function of recovering waste heat, leads to the residual heat resources of boiler blow-off
Significant wastage.
Summary of the invention
The present invention provides a kind of hot-water boiler blowdown cool-down method and system, to solve sewage existing in the prior art
The problem of cooling system lacks function of recovering waste heat, leads to the significant wastage of the residual heat resources of boiler blow-off.
The embodiment of the present invention provides a kind of hot-water boiler blowdown cool-down method, comprising:
The sewage that will be discharged from the effluent discharge outlet of hot-water boiler, is transmitted to the row being connected to the effluent discharge outlet
Dirty pipeline；
The sewage of the blow-off line will be entered, is successively transmitted to starting point, heat exchange department and the end of the blow-off line
End, so that being transmitted to the sewage of the heat exchange department and the cold water generation heat exchange in the softening water tank；
Wherein, the starting point is connected to the effluent discharge outlet, and is laid on the hot-water boiler and softening water tank
Between, the heat exchange department is laid in the softening water tank, and the end is stretched out from the softening water tank.
Further, the exchange heat of the heat exchange department, according to the sewage for the starting point for being transmitted to the blow-off line
Temperature and the sewage temperature for the end for being input to the blow-off line determine；
The exchange heat of the heat exchange department is determined in the following manner, wherein the exchange heat of the heat exchange department is
The heat of heat exchange occurs for the cold water in the sewage for being transmitted to the heat exchange department and the softening water tank；
Wherein, G is the sewerage discharging flow of the hot-water boiler, and Q is the exchange heat of the heat exchange department, and c is water
Specific heat capacity, t1For be input to the blow-off line starting point sewage temperature, t2 is the end for being input to the blow-off line
Sewage temperature.
Further, the length of the heat exchange department is that the blow-off line is laid on the length in the softening water tank,
The length of the heat exchange department determines that the heat exchange area of the heat exchange department is according to institute according to the heat exchange area of the heat exchange department
The exchange heat for stating heat exchange department determines.
Further, the heat exchange area of the heat exchange department is determined in the following manner:
Q=K × F × Δ t
Wherein, Q is the exchange heat of the heat exchange department, and K is heat transfer coefficient, and Δ t is logarithmic temperature difference, and F is that the heat is handed over
Change the heat exchange area in portion.
Further, the length of the heat exchange department is determined in the following manner:
F=2 π rL
Wherein, r is the inside radius of the blow-off line, and L is the length of the heat exchange department, and F is the heat exchange department
Heat exchange area.
Further, the heat exchange department is laid in the softening water tank, is specifically included:
According to the inside dimension of the length of the heat exchange department and the softening water tank, determine the heat exchange department described
Coiling circle number and coiled shape in softening water tank；
Number and the coiled shape are enclosed according to the coiling, is arranged in the softening water tank for fixing the heat exchange
Device is fixed in portion；And the heat exchange department is laid in the fixed device.
Further, the coiled shape of the heat exchange department is along the bottom of the softening water tank to the softening water tank
Top is coiled into annular.
The present invention is that embodiment provides a kind of hot-water boiler blowdown cooling system, comprising: hot-water boiler, blow-off line and soft
Change water tank；
The hot-water boiler is provided with effluent discharge outlet；
The blow-off line includes starting point, heat exchange department and end, and the starting point and the effluent discharge outlet connect
It is logical, and be laid between the hot-water boiler and softening water tank, the heat exchange department is laid in the softening water tank, the end
End is stretched out from the softening water tank, so that entering the sewage of the blow-off line from the effluent discharge outlet, is successively transmitted to
The starting point, the heat exchange department and the end；
Wherein, it is transmitted to the sewage of the heat exchange department and heat exchange occurs for the cold water in the softening water tank, so that passing
The sewage temperature for transporting to the end is threshold temperature.
Further, the fixation device for fixing the heat exchange department is provided in the softening water tank；The heat is handed over
It changes portion and is laid in the fixed device with the coiling circle number and coiled shape that set, wherein the coiling circle number and winding escalator
Shape is determined according to the length of the heat exchange department and the inside dimension of the softening water tank.
Further, the length of the heat exchange department is determined according to the heat exchange area of the heat exchange department, the heat exchange
The heat exchange area in portion is determined according to the exchange heat of the heat exchange department；The exchange heat of the heat exchange department, according to being transmitted to
The sewage temperature of the starting point of the blow-off line and the sewage temperature for the end for being input to the blow-off line determine.
In the embodiment of the present invention, blow-off line need to be only laid in softening water tank, more than sewage in blow-off line
Heat heats the cold water in softening water tank, realizes the purpose of discharge after sewage cools down, sewage remaining energy recycling.Specifically,
The connection relationship of drain outlet and hot-water boiler, softening water tank are as follows: the starting point of drain outlet and the sewage discharge of hot-water boiler
The starting point of outlet, drain outlet is laid between hot-water boiler and softening water tank；The heat exchange department of drain outlet is laid with
In softening water tank, the end of drain outlet is drain outlet from the part that softening water tank stretches out；And then it is closed according to above-mentioned connection
System, the sewage being discharged from the effluent discharge outlet of hot-water boiler are successively transmitted to the blow-off line into after blow-off line
Starting point, heat exchange department and end, are transmitted to the sewage of the heat exchange department and the cold water in the softening water tank occurs heat and hands over
It changes, so that the sewage temperature for being transmitted to the end drops to threshold temperature, is transmitted to the sewage of the end of drain outlet, discharge
In drainage system outside to softening water tank.Cold water in the sewage and softening water tank of drain outlet is subjected to heat exchange, both may be used
It is discharged after being down to threshold temperature with the temperature for achieving the purpose that sewage, and can be using the waste heat of sewage by the water in softening water tank
It is heated, realizes the waste heat recycling of sewage, economize on resources.
In the embodiment of the present invention, blow-off line need to be only laid in softening water tank, no setting is required special cooling system
Blowdown cooling is carried out, equipment investment can also be saved, reduces equipment space occupied.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, is implemented with the present invention
Example is used to explain the present invention together, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is a kind of structural schematic diagram of hot-water boiler blowdown cooling system provided in an embodiment of the present invention；
Fig. 2 is a kind of method flow schematic diagram of hot-water boiler blowdown cool-down method provided in an embodiment of the present invention；
Fig. 3 is a kind of method flow schematic diagram that blow-off line is laid in softening water tank provided in an embodiment of the present invention.
Specific embodiment
In order to make technical problem solved by the invention, technical solution and it is effective be more clearly understood, below in conjunction with
Preferred embodiment of the present invention will be described for Figure of description, it should be understood that preferred embodiment described herein is only used for
The description and interpretation present invention, is not intended to limit the present invention.And in the absence of conflict, the embodiment and reality in the application
The feature applied in example can be combined with each other.
Lack function of recovering waste heat to solve sewage cooling system existing in the prior art, leads to the remaining of boiler blow-off
The problem of significant wastage of thermal resource, the embodiment of the present invention provide a kind of hot-water boiler blowdown cool-down method and system, using existing
The waste-heat recovery device for the sewage for thering is the softening water tank in boiler system to discharge as hot-water boiler, by the way that blow-off line to be laid with
In softening water tank, the cold water in softening water tank is heated using the waste heat of sewage in blow-off line, sewage drops in realization
The purpose of discharge, sewage remaining energy recycling after temperature.
As shown in Figure 1, hot-water boiler sewage cooling system provided in an embodiment of the present invention, comprising:
Hot-water boiler, blow-off line and softening water tank；Hot-water boiler is provided with effluent discharge outlet；Blow-off line includes
Beginning, heat exchange department and end；
As shown in Figure 1, the connection relationship of blow-off line and hot-water boiler, softening water tank are as follows: the starting point of blow-off line with
The effluent discharge outlet of hot-water boiler is connected to, and the starting point of blow-off line is laid between hot-water boiler and softening water tank；Blowdown
The heat exchange department of pipeline is laid in softening water tank, and the end of blow-off line is stretched out from softening water tank, i.e. the end of drain outlet
It is drain outlet from the part that softening water tank stretches out.
Wherein, the heat exchange department of blow-off line is laid in softening water tank with the coiling circle number and coiled shape that set.Tool
In body example, the heat exchange department of blow-off line is fixed in softening water tank by one fixed device of setting, makes blow-off line
Heat exchange department is laid in softening water tank with the coiling circle number and coiled shape that set.Coiling of the heat exchange department in softening water tank
Number and coiled shape are enclosed, is to determine that heat is handed over according to the length of the heat exchange department of blow-off line and the inside dimension of softening water tank
Change the length that the length in portion is laid in softening water tank for blow-off line.
In specific example, the length of the heat exchange department of blow-off line is mainly determined according to the heat exchange area of heat exchange department.
In specific example, the heat exchange area of heat exchange department is mainly determined according to the exchange heat of heat exchange department, wherein heat
The exchange heat of exchange part is that the heat of heat exchange occurs for the cold water being transmitted in the sewage and softening water tank of heat exchange department.
In specific example, the exchange heat of heat exchange department, the main sewage temperature according to the starting point for being transmitted to blow-off line
Spend and be input to blow-off line end sewage temperature determine.
The above-mentioned connection relationship of blow-off line and hot-water boiler, softening water tank, so that entering blowdown from effluent discharge outlet
The sewage of pipeline is successively transmitted to the end of the starting point of blow-off line, the heat exchange department of blow-off line and blow-off line；And
Heat exchange occurs for the cold water being transmitted in the sewage and softening water tank of the heat exchange department of blow-off line, so that being transmitted to blow-off line
End sewage temperature be threshold temperature, the threshold temperature be less than or equal to trade effluent effluent standard temperature, be transmitted to
The temperature of the sewage of the end of drain outlet can be discharged into the drainage system outside softening water tank after meeting discharge standard.
Using the waste-heat recovery device for the sewage that the softening water tank in existing boiler system is discharged as hot-water boiler, pass through
Blow-off line is laid in softening water tank, and the cold water in softening water tank is added using the waste heat of sewage in blow-off line
Heat not only can achieve the purpose that the temperature of sewage is down to after discharge standard and is discharged into drainage system, but also can utilize the remaining of sewage
Heat heats the water in softening water tank, realizes the waste heat recycling of sewage, economizes on resources.
In the embodiment of the present invention, blow-off line need to be only laid in softening water tank, no setting is required special cooling system
Blowdown cooling is carried out, equipment investment can also be saved, reduces equipment space occupied.
Based on hot-water boiler blowdown cooling system shown in FIG. 1, the embodiment of the invention provides a kind of hot-water boiler blowdowns
Cool-down method, as shown in Fig. 2, specifically including:
Step 201, the sewage that will be discharged from the effluent discharge outlet of hot-water boiler is transmitted to and arranges with the sewage of hot-water boiler
The blow-off line of discharge port connection；
Step 202, the sewage that will enter blow-off line, is successively transmitted to starting point, heat exchange department and the end of blow-off line
End, so that heat exchange occurs for the cold water being transmitted in the sewage and softening water tank of the heat exchange department of blow-off line；
Wherein, the starting point of blow-off line is connected to effluent discharge outlet, and be laid on hot-water boiler and softening water tank it
Between, the heat exchange department of blow-off line is laid in softening water tank, and end is stretched out from softening water tank.
In the embodiment of the present invention, the process that blow-off line is laid in softening water tank is additionally provided, as shown in figure 3, including
Following steps:
Step 301, according to formula one, the exchange heat of heat exchange department is calculated；
Wherein, G is the sewerage discharging flow of hot-water boiler, and Q is the exchange heat of heat exchange department, and c is the specific heat capacity of water, t1
For be input to blow-off line starting point sewage temperature, t2 is the sewage temperature for being input to the end of blow-off line.
In formula one, t1For known quantity, it is input to the sewage temperature of the end of blow-off line, is equal to from hot-water boiler and is discharged
Sewage temperature, the temperature of sewage being discharged from hot-water boiler is not fixed, the temperature for the sewage being usually discharged from hot-water boiler,
It is determined by the heating demand of user, hot-water boiler supply water temperature is high, and discharge sewage temperature is just high, 60 degree to 90 of usual frequently-used data
Between degree.
In formula one, t2 is known quantity, and the sewage temperature for being input to the end of blow-off line is the threshold temperature of setting, should
Threshold temperature is less than or equal to the effluent standard temperature of trade effluent, if selected threshold temperature is 40 DEG C.
In formula one, the value of the sewerage discharging flow discharge amount G of hot-water boiler is known quantity, and the value of G is according to selected by
The specifications and models of hot-water boiler determine that G is the weight of the water discharged in unit hour, and unit is ton/hour (t/h), by G's
Value substitutes into formula for the moment, can be scaled general unit, and such as (103kg/h)。
In formula one, specific heat capacity c=4.2 × 10 of water3J/ (kg DEG C) indicates that 1 dry gram of coolant-temperature gage increases (or reduction) l
The heat for DEG C absorbing (or releasing) is 4.2 × 103 joules.
In formula one, the unit of calculated Q is kJ/h, i.e. (* DEG C * 10 of J/ (kg DEG C)3kg/h)。
Step 302, according to formula two, the heat exchange area of heat exchange department is calculated；
Q=K × F × Δ t (formula two)
Wherein, Q is the exchange heat of heat exchange department, and K is heat transfer coefficient, and Δ t is logarithmic temperature difference, and F is changing for heat exchange department
Heat area.
In formula two, the unit of Q is that hour h is converted into 3600s when substituting into formula two by kJ/h.
In formula two, K is the heat transfer coefficient of blow-off line, and heat transfer coefficient claims overall heat-transfer coefficient, national current standard specifications
It uniformly names as heat transfer coefficient.The value of Coefficient K refers to that under the conditions of steady heat transfer, building enclosure two sides Air Temperature Difference is 1
Degree, the heat transmitted in 1s by 1 square metre of area, unit are watt/(square metre degree) (W/m2·℃).Wherein, 1 kilowatt hour
=1 kilowatt-hour=1000 watts hour=1000*3600 watt-seconds=3600000 are burnt, therefore, K substituted into formula two
When, it should be burnt according to 1 kilowatt hour=3600000, carry out unit conversion.
Heat transfer coefficient depends on the material of blow-off line itself, if not stringent, can take 2000~3000.
In formula two, logarithmic temperature difference Δ t, referring to two kinds of fluids, the integral of the diabatic process temperature difference is averaged in a heat exchanger
It is worth, refers in the embodiment of the present invention, heat exchange occurs into the cold water in the sewage and softening water tank of blow-off line heat exchange department
When the average value of the integral of the temperature difference that generates.
The usual calculation method of logarithmic temperature difference Δ t are as follows:
When adverse current, △ T1=T1-t2, △ T2=T2-t1；
When fair current, △ T1=T1-t1, △ T2=T2-t2；
As △ T1/ △ T2 > 1.7, logarithmic temperature difference Δ t=(△ T1- △ T2)/㏑ (△ T1/ △ T2),
As △ T1/ △ T2≤1.7, logarithmic temperature difference Δ t=(△ T1+ △ T2)/2,
Wherein, T1 is hot-fluid inlet temperature, DEG C；T2 is hot outlets temperature, DEG C；T1 is cold flow inlet temperature, DEG C；T2 is
Cold flow outlet temperature, DEG C；Ln is natural logrithm.
The calculation method of above-mentioned logarithmic temperature difference belongs to well-known technique, can refer to specific document in detail, is not repeated herein.
In formula two, the unit of the heat exchange area of heat exchange department is m2。
Step 303, according to formula three, the length of heat exchange department is calculated；
In the embodiment of the present invention, the length of heat exchange department is determined in the following manner:
F=2 π rL (formula three)
Wherein, π is pi, and r is the inside radius of blow-off line, and L is the length of heat exchange department, and F is changing for heat exchange department
Heat area.
In formula three, since the flow velocity of the softened water in softening water tank is small, to prevent heat exchange not exclusively, formula is being substituted into
When the length of three calculating blow-off line heat exchange departments, the heat exchange area F of heat exchange department is needed multiplied by a safety coefficient, such as 1.2.
In formula three, the inside radius of selected blow-off line is known quantity, unit m.
Step 304, coiling circle number and coiled shape of the design heat exchange department in softening water tank；
Specifically, determining heat exchange department in softening water tank in conjunction with the length of heat exchange department and the inside dimension of softening water tank
In coiling circle number and coiled shape, for example, stating the coiling of heat exchange department to keep the heat exchange in softening water tank more abundant
Shape can for along the bottom of the softening water tank to being coiled into annular at the top of the softening water tank.
Step 305, the location and shape designed for the fixation device of fixed heat exchange department in softening water tank；
According to coiling circle number and coiled shape, shape and the position of fixed device are determined.
Step 306, heat exchange department is laid in fixed device.
In the above-mentioned hot-water boiler blowdown cool-down method of the present invention, using the softening water tank in existing boiler system as hot water
The waste-heat recovery device of the sewage of boiler emission, by the way that blow-off line to be laid in softening water tank, and using in blow-off line
The waste heat of sewage heats the cold water in softening water tank, both can achieve and has discharged after the temperature of sewage is down to discharge standard
To the purpose of drainage system, and the water in softening water tank can be heated using the waste heat of sewage, realize that the waste heat of sewage returns
It receives, economizes on resources.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (8)
1. a kind of hot-water boiler blowdown cool-down method characterized by comprising
The sewage that will be discharged from the effluent discharge outlet of hot-water boiler, is transmitted to the sewage pipe being connected to the effluent discharge outlet
Road；
The sewage of the blow-off line will be entered, is successively transmitted to starting point, heat exchange department and the end of the blow-off line, makes
Heat exchange occurs for the cold water that must be transmitted in the sewage and softening water tank of the heat exchange department；
The length of the heat exchange department is that the blow-off line is laid on the length in the softening water tank, the heat exchange department
Length determines according to the heat exchange area of the heat exchange department, and the heat exchange area of the heat exchange department is according to the friendship of the heat exchange department
Heat exchange amount determines；
The exchange heat of the heat exchange department, determines according to the following formula；Wherein, the exchange heat of the heat exchange department is described
It is transmitted to the sewage of the heat exchange department and the heat of heat exchange occurs for the cold water in the softening water tank；
Wherein, G is the sewerage discharging flow of the hot-water boiler, and Q is the exchange heat of the heat exchange department, and c is the specific heat of water
Hold, t1For be input to the blow-off line starting point sewage temperature, t2For be input to the blow-off line end sewage
Temperature；
Wherein, the starting point is connected to the effluent discharge outlet, and is laid between the hot-water boiler and softening water tank,
The heat exchange department is laid in the softening water tank, and the end is stretched out from the softening water tank.
2. the method as described in claim 1, which is characterized in that determine the heat-transfer surface of the heat exchange department in the following manner
Product:
Q=K × F × Δ t
Wherein, Q is the exchange heat of the heat exchange department, and K is heat transfer coefficient, and Δ t is logarithmic temperature difference, and F is the heat exchange department
Heat exchange area.
3. method according to claim 2, which is characterized in that determine the length of the heat exchange department in the following manner:
F=2 π rL
Wherein, r is the inside radius of the blow-off line, and L is the length of the heat exchange department, and F is the heat exchange of the heat exchange department
Area.
4. method according to any one of claims 1 to 3, which is characterized in that the heat exchange department is laid on the softening
In water tank, specifically include:
According to the inside dimension of the length of the heat exchange department and the softening water tank, determine the heat exchange department in the softening
Coiling circle number and coiled shape in water tank；
Number and the coiled shape are enclosed according to the coiling, setting is solid for fixing the heat exchange department in the softening water tank
Determine device；And the heat exchange department is laid in the fixed device.
5. method as claimed in claim 4, which is characterized in that the coiled shape of the heat exchange department is along the softening water tank
Bottom to being coiled into annular at the top of the softening water tank.
6. a kind of hot-water boiler blowdown cooling system characterized by comprising hot-water boiler, blow-off line and softening water tank；
The hot-water boiler is provided with effluent discharge outlet；
The blow-off line includes starting point, heat exchange department and end, and the starting point is connected to the effluent discharge outlet, and
Be laid between the hot-water boiler and softening water tank, the heat exchange department is laid in the softening water tank, the end from
The softening water tank stretches out, so that entering the sewage of the blow-off line from the effluent discharge outlet, is successively transmitted to described
Starting point, the heat exchange department and the end；
Wherein, it is transmitted to the sewage of the heat exchange department and heat exchange occurs for the cold water in the softening water tank, so that being transmitted to
The sewage temperature of the end is threshold temperature；
The length of the heat exchange department is that the blow-off line is laid on the length in the softening water tank, the heat exchange department
Length determines according to the heat exchange area of the heat exchange department, and the heat exchange area of the heat exchange department is according to the friendship of the heat exchange department
Heat exchange amount determines；
Wherein, the exchange heat of the heat exchange department, determines according to the following formula；Wherein, the exchange heat of the heat exchange department
The heat of heat exchange occurs for the cold water in the sewage for being transmitted to the heat exchange department and the softening water tank；
Wherein, G is the sewerage discharging flow of the hot-water boiler, and Q is the exchange heat of the heat exchange department, and c is the specific heat of water
Hold, t1For be input to the blow-off line starting point sewage temperature, t2For be input to the blow-off line end sewage
Temperature.
7. system as claimed in claim 6, which is characterized in that be provided in the softening water tank for fixing the heat exchange
The fixation device in portion；The heat exchange department is laid in the fixed device with the coiling circle number and coiled shape that set, wherein
The coiling circle number and coiled shape are determined according to the length of the heat exchange department and the inside dimension of the softening water tank
's.
8. system as claimed in claim 6, which is characterized in that
The length of the heat exchange department is determining according to the heat exchange area of the heat exchange department, the heat exchange area root of the heat exchange department
It is determined according to the exchange heat of the heat exchange department；The exchange heat of the heat exchange department, according to being transmitted to the blow-off line
The sewage temperature of starting point and the sewage temperature for the end for being input to the blow-off line determine.
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