CN105091661A - Cleaning method of waste water heat exchanger and waste water heat exchange system - Google Patents
Cleaning method of waste water heat exchanger and waste water heat exchange system Download PDFInfo
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- CN105091661A CN105091661A CN201510478722.2A CN201510478722A CN105091661A CN 105091661 A CN105091661 A CN 105091661A CN 201510478722 A CN201510478722 A CN 201510478722A CN 105091661 A CN105091661 A CN 105091661A
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Abstract
The invention discloses a cleaning method of a waste water heat exchanger and a waste water heat exchange system, and belongs to the technical field of waste water heat exchanger cleaning. The cleaning method of the waste water heat exchanger comprises the steps that steam is introduced into a waste water inlet pipe at a waste water inlet end of the waste water heat exchanger and mingled and mixed with waste water in the waste water inlet pipe; and the mingled and mixed waste water enters the heat exchange side of the waste water heat exchanger and flows through the heat exchange surface, and steam bubbles are cracked through the action of the pressure difference in the flowing direction to cause water wave impacts so that the dirt on the heat exchange surface can be removed. According to the method, the dirt removing effect is good, the corrosion of heat exchange equipment cannot be caused, and environment friendliness is well achieved. Meanwhile, the waste water heat exchange system is simple and compact in structure, the waste water heat exchanger does not need to be dismounted during maintaining, and operation is easy and convenient.
Description
Technical field
The present invention relates to a kind of cleaning method of sewage heat exchanger, also relate to a kind of sewage heat change system simultaneously, belong to sewage heat exchanger cleaning technique field.
Background technology
Along with global energy imbalance between supply and demand increasingly sharpens, how to utilize the energy efficiently, reclaim various waste heat thus realize energy-saving and cost-reducing, become the problem that enterprise self is in the urgent need to address.Medium-high temperature sewage source heating technology is the effective technology in order to solve the petroleum chemical industry energy and environmental problem grown up in the recent period, and this technology is in the petroleum chemical industry extensive use of European and American developed countries at present.
Sewage source heat pump system is that to consume a part of high-grade can (mechanical energy, electric energy etc.) or high temperature heat be cost, pass through thermodynamic cycle, waste heat in the various waste water such as sanitary sewage, industrial wastewater, dyeing waste water, coal mine waste water, oil extraction-generated waste water is converted into the high-grade heat of 70 ~ 90 DEG C, the high efficiency energy that supply hotel, market, residential quarter, factory etc. use utilizes system.Wherein, sewage heat exchanger is the leading portion equipment in sewage source heat pump system, be mainly used to extract the heat energy be dispersed in urban original wastewater, industrial wastewater, washing slag water, dyeing waste water, oil extraction-generated waste water etc., and as intermediate medium, sewage heat energy being passed to source pump by clear water, heat energy is passed to building heating or is used for industry heating by last source pump.The Energy Efficiency Ratio of sewage heat exchanger is large, plays very important effect in energy-saving and emission-reduction.
The heat exchange of sewage is the key link in sewage source heat pump technology, and sewage heat exchanger requires to have the functions such as anti-clogging, anticorrosion, good antiscale property, preventing microorganism breeding.For oilfield produced water, due to its oil-containing, containing poly-(polyacrylamide), sulfur-bearing (negative divalent sulfur), mix containing machine, corrosive nature is strong, higher to the requirement of sewage heat exchanger material and structure, need mix absorption, blocking, corrosion and scaling etc. of the machine that may cause in solution equipment longtime running to affect the problem of heat exchange efficiency.
At present, the cleaning method of sewage heat exchanger is mainly divided into chemical agent ablution and physical cleaning method.Chemical agent ablution is normal with product and the problem such as environmental pollution, equipment corrosion, comparatively speaking, and the safer and environmental protection of physical cleaning method.Physical cleaning method mainly relies on flowing or the mechanicals efforts of fluid, there is provided a kind of be greater than the power of dirt adheres power thus the dirt on heat-transfer surface is peeled off, comprise water under high pressure and wash away method, backward erosion method, hot water removing sticky foulant method, rubber ball cleaning method, the interior insert ablution of pipe etc.By the difference at scavenging period interval, physical cleaning method is divided into periodic cleaning and on-line cleaning two kinds.The particular content of periodic cleaning be when heat exchange surface accumulating foulants to a certain extent time people for taking heat exchanger apart, giant or metal bar is adopted to remove the dirt of heat exchange surface one by one, the method needs to consume a large amount of manpower and materials and man-hour, can not ensure that system high efficiency runs.And on-line cleaning method does not need to disassemble heat exchanger, in equipment running process, automatically complete cleaning operation, not only can not wasting manpower and material resources and man-hour, also can not cause environmental pollution, can ensure that equipment is in efficient operation for a long time.Existing on-line cleaning method is mainly divided into two kinds, a kind of is the cleaning method relying on waterpower, with spring insert on-line cleaning for representative, such as, disclosed in the patent of invention of application number 200810095827.X a kind of heat exchanger with Impurity removal mechanism, Impurity removal mechanism comprises the spiral spring for making stream inner fluid produce turbulent fluidised form, because spiral spring is flexible under the active force of streaming flow, thus the impurity being attached to equipment inner surface is peeled off, another kind is the cleaning method relying on mechanical force and waterpower to combine, with glueballs on-line cleaning and powered brush on-line cleaning for representative, the online rubber ball cleaning system of a kind of heat exchanger disclosed in the utility model patent of application number 201320215366.1, comprise the heat exchanger controlled by triple valve, ball-collecter, glueballs driving pump and ball separator, by the On/Off state of switch three-way valve, glueballs in ball-collecter is entered in heat exchanger heat-exchanging tube clean, clean complete glueballs and be back to ball separator, then enter in ball-collecter under the effect of glueballs driving pump and complete collection.In addition, the utility model patent of application number 201120578814.5 also discloses a kind of vertical self cleaning sewage source heat pump heat exchanger, comprise heat exchanger body and be arranged at the speed reducer drive portion on heat exchanger body, speed reducer drive portion comprises by motor-driven reductor and the powered brush that is connected with reductor, in heat exchanger runs, powered brush moves up and down along heat exchanger tube bearing of trend under reductor controls, and the dirty foreign material of heat exchanging tube-surface and the attachment of heat exchanger shell inner surface are scrubbed.But the mechanical construction and control system of above-mentioned two kinds of on-line cleaning devices is all more complicated, and sewage quality can cause the corrosion of mechanism, glueballs etc. in system, the long-term Effec-tive Function of equipment can not be ensured.
Summary of the invention
The object of this invention is to provide a kind of cleaning method of simple, effective sewage heat exchanger.
Meanwhile, the present invention also provides a kind of sewage heat change system, to solve the problem of cleaning part complicated in mechanical structure, poor corrosion resistance in existing system.
In order to realize above object, the technical solution adopted in the present invention is:
The cleaning method of sewage heat exchanger, at the wastewater inlet end of (or close) sewage heat exchanger, passes into water vapour in sewage water inlet pipe, carries out doping mix with the sewage in sewage water inlet pipe; The mixed sewage that adulterates enters the heat exchange side of sewage heat exchanger, flows through heat exchange surface, and breaking under differential pressure action along flow direction water vapour bubble causes Water wave impact, by the dirt removal of heat exchange surface.
Sewage heat change system, comprise heat exchanging part and cleaning part, the sewage water inlet pipe that heat exchanging part comprises sewage heat exchanger and is connected with the wastewater inlet of sewage heat exchanger, described cleaning part comprises the steam inlet duct for being connected with water vapor source, and the outlet side of steam inlet duct is connected on sewage water inlet pipe.
In order to realize the adjustment to steam pipework On/Off state and water vapour throughput size, simultaneously for avoiding sewage to pour in steam pipework, steam inlet duct sets gradually control valve and unidirectional stop valve along water vapour airintake direction.
Further, cleaning part also comprises the steam generator as water vapor source, and the steam (vapor) outlet of steam generator is connected with the inlet end of steam inlet duct.Steam generator comprises tank body and is arranged on tank interior for heating the heating element heater of clear water producing water vapor, and heating element heater is electrically connected for the heating power supply controlling steam generator duty with being arranged on tank body.
Further, heat exchanging part also comprises sewage pump, and sewage delivery side of pump is connected with the water inlet end of sewage water inlet pipe.
In order to realize the function that sewage heat exchanger takes out stains online, automatically, the heat exchanging part of sewage heat change system also comprises the pressure difference between the sewage import and export for measuring sewage heat exchanger, and starts the plumbing drain differential pressure pickup that steam generator produces water vapour when pressure difference is greater than setting value.Cleaning part also comprises for measuring steam pressure and sewage delivery side of pump hydraulic pressure in steam generator, and opens the steam pipework differential pressure pickup that steam inlet duct opened by control valve when steam pressure is greater than outlet hydraulic pressure.Further, control valve specifically selects electric control valve.
Pressure difference between the sewage import and export recording sewage heat exchanger is greater than setting value, show that the dirt quantity of sewage side heat exchange surface in sewage heat exchanger is greater than service requirement, plumbing drain differential pressure pickup sends the signal of telecommunication to the heating power supply on steam generator, heating power supply is energized, the clear water producing water vapor of heating element heats; Water vapour in steam generator is constantly accumulated, when recording steam pressure in tank body and being greater than sewage delivery side of pump hydraulic pressure, steam pipework differential pressure pickup sends the signal of telecommunication to electric control valve, valve open, steam inlet duct is opened and is communicated with sewage water inlet pipe, high-pressure water vapor along airintake direction flowing, adulterates with the sewage in sewage water inlet pipe rapidly and mixes in steam inlet duct.The mixed sewage that adulterates enters the heat exchange side of sewage heat exchanger, flows through heat exchange surface, and the water vapour bubble along flow direction heat exchange side breaks and causes Water wave impact under differential pressure action, thus by the dirt removal of heat exchange surface.
Beneficial effect of the present invention:
Water vapour passes in sewage water inlet pipe at the wastewater inlet end of sewage heat exchanger by the present invention, carry out doping with the sewage in sewage water inlet pipe to mix, the mixed sewage that adulterates enters the heat exchange side of sewage heat exchanger, flow through heat exchange surface, break under differential pressure action along flow direction high-pressure water vapor bubble and cause Water wave impact, by the dirt removal of heat exchange surface.Above-mentioned cleaning method features high scale-removing effect, can not cause heat transmission equipment to corrode, very friendly to environment.
In the present invention, the structure of sewage heat change system is simple, compact, without the need to dismounting sewage heat exchanger during maintenance, easy and simple to handle.Further, by arranging plumbing drain differential pressure pickup in heat exchanging part, cleaning part arranges steam pipework differential pressure pickup, can realize the function that sewage heat exchanger takes out stains online, automatically.
Accompanying drawing explanation
Fig. 1 is the structural representation of sewage heat change system in embodiment 2.
Detailed description of the invention
Following embodiment is only described in further detail the present invention, but does not form any limitation of the invention.
Embodiment 1
In the present embodiment, the cleaning method of sewage heat exchanger is: at the wastewater inlet end near sewage heat exchanger, passed into by water vapour in sewage water inlet pipe, carry out doping mix with the sewage in sewage water inlet pipe; The mixed sewage that adulterates enters the heat exchange side of sewage heat exchanger, flows through heat exchange surface, and the water vapour bubble along flow direction heat exchange side breaks and causes Water wave impact, by the dirt removal of heat exchange surface under differential pressure action.
Embodiment 2
Realize sewage heat exchanger in the present embodiment online, automatically to take out stains the sewage heat change system of function, as shown in Figure 1, comprise heat exchanging part and cleaning part, the sewage water inlet pipe 11 that heat exchanging part comprises sewage heat exchanger 5 and is connected with the wastewater inlet of sewage heat exchanger 5, described cleaning part comprises the steam inlet duct 12 for being connected with water vapor source, and the outlet side of steam inlet duct 12 is connected on sewage water inlet pipe 11.Meanwhile, the clear water import and export of sewage heat exchanger 5 connects into loop with heat pump assembly 7 respectively.In Fig. 1, arrow represents water (flow) direction.
In the present embodiment, heat exchanging part also comprises sewage pump 1, and the outlet of sewage pump 1 is connected with the water inlet end of sewage water inlet pipe 11; Cleaning part also comprises the steam generator 8 as water vapor source, and the steam (vapor) outlet of steam generator 8 is connected with the inlet end of steam inlet duct 12.
In the present embodiment, steam generator 8 comprises tank body and is arranged on tank interior for heating the heating element heater of clear water producing water vapor, and heating element heater is electrically connected for the heating power supply 9 controlling steam generator duty with being arranged on tank body.Tank body also offers the clear water import for being connected with clear water filling pipe 10.
In order to realize the adjustment to steam pipework On/Off state and water vapour throughput size, simultaneously for avoiding sewage to pour in steam pipework, steam inlet duct 12 sets gradually control valve 3 and unidirectional stop valve 4 along water vapour airintake direction.
In order to realize the function that sewage heat exchanger takes out stains online, automatically, the heat exchanging part of sewage heat change system also comprises the pressure difference between the sewage import and export for measuring sewage heat exchanger 5, and starts the plumbing drain differential pressure pickup 6 that steam generator 8 produces water vapour when pressure difference is greater than setting value; Cleaning part also comprises the outlet hydraulic pressure for measuring steam pressure and sewage pump 1 in steam generator 8, and opens the steam pipework differential pressure pickup 2 that steam inlet duct 12 opened by control valve 3 when steam pressure is greater than outlet hydraulic pressure; Control valve 3 specifically selects electric control valve.
Pressure difference between the sewage import and export recording sewage heat exchanger 5 is greater than setting value, show that the dirt quantity of sewage side heat exchange surface in sewage heat exchanger 5 is greater than service requirement, plumbing drain differential pressure pickup 6 sends the signal of telecommunication to the heating power supply 9 on steam generator 8, heating power supply 9 is energized, the clear water producing water vapor of heating element heats, water vapour in steam generator 8 is constantly accumulated, when recording steam pressure in tank body and being greater than the outlet hydraulic pressure of sewage pump 1, steam pipework differential pressure pickup 2 sends the signal of telecommunication to electric control valve, valve opening, steam inlet duct 12 is opened and is communicated with sewage water inlet pipe 11, high-pressure water vapor flows along airintake direction in steam inlet duct 12, adulterate with the sewage in sewage water inlet pipe 11 rapidly and mix, the mixed sewage that adulterates enters the heat exchange side of sewage heat exchanger 5, flow through heat exchange surface, water vapour bubble along flow direction heat exchange side breaks and causes Water wave impact under differential pressure action, thus by the dirt removal of heat exchange surface.In the clear water side of sewage heat exchanger 5, the clear water exported by heat pump assembly 7 flows through heat exchange surface, again as thermal source input heat pump assembly 7 after heat temperature raising.
Owing to not having air in steam generator 8, after water vapour enters and takes out stains in sewage heat exchanger 5, rapid condensation liquefaction, can not produce any harmful effect to follow-up pipeline.Above-mentioned cleaning method features high scale-removing effect, can not cause heat transmission equipment to corrode, very friendly to environment.Meanwhile, the structure of sewage heat change system is simple, compact, without the need to dismounting heat exchanger during maintenance, easy and simple to handle, can be widely used in the heat exchange of oilfield produced water, water mixing, crude oil, opens and can reduce operating cost when electricity price is lower as in the night.
Claims (9)
1. the cleaning method of sewage heat exchanger, is characterized in that: at the wastewater inlet end of sewage heat exchanger, passed into by water vapour in sewage water inlet pipe, carries out doping mix with the sewage in sewage water inlet pipe; The mixed sewage that adulterates enters the heat exchange side of sewage heat exchanger, flows through heat exchange surface, and breaking under differential pressure action along flow direction water vapour bubble causes Water wave impact, by the dirt removal of heat exchange surface.
2. sewage heat change system, comprise heat exchanging part and cleaning part, the sewage water inlet pipe that heat exchanging part comprises sewage heat exchanger and is connected with the wastewater inlet of sewage heat exchanger, it is characterized in that: described cleaning part comprises the steam inlet duct for being connected with water vapor source, the outlet side of steam inlet duct is connected on sewage water inlet pipe.
3. sewage heat change system according to claim 2, is characterized in that: on steam inlet duct, set gradually control valve and unidirectional stop valve along water vapour airintake direction.
4. sewage heat change system according to claim 3, is characterized in that: the cleaning part of sewage heat change system also comprises the steam generator as water vapor source, and the steam (vapor) outlet of steam generator is connected with the inlet end of steam inlet duct.
5. sewage heat change system according to claim 4, it is characterized in that: steam generator comprises tank body and is arranged on tank interior for heating the heating element heater of clear water producing water vapor, heating element heater is electrically connected for the heating power supply controlling steam generator duty with being arranged on tank body.
6. sewage heat change system according to claim 4, it is characterized in that: the heat exchanging part of sewage heat change system also comprises sewage pump, sewage delivery side of pump is connected with the water inlet end of sewage water inlet pipe.
7. sewage heat change system according to claim 6, it is characterized in that: the heat exchanging part of sewage heat change system also comprises the pressure difference between the sewage import and export for measuring sewage heat exchanger, and start the plumbing drain differential pressure pickup that steam generator produces water vapour when pressure difference is greater than setting value.
8. the sewage heat change system according to claim 6 or 7, it is characterized in that: the cleaning part of sewage heat change system also comprises for measuring steam pressure and sewage delivery side of pump hydraulic pressure in steam generator, and open the steam pipework differential pressure pickup that steam inlet duct opened by control valve when steam pressure is greater than outlet hydraulic pressure.
9. sewage heat change system according to claim 8, is characterized in that: electric control valve selected by control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510478722.2A CN105091661A (en) | 2015-08-06 | 2015-08-06 | Cleaning method of waste water heat exchanger and waste water heat exchange system |
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| CN201510478722.2A CN105091661A (en) | 2015-08-06 | 2015-08-06 | Cleaning method of waste water heat exchanger and waste water heat exchange system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106288939A (en) * | 2016-10-21 | 2017-01-04 | 天津大学建筑设计研究院 | A kind of full-automatic on-line cleaning device being applicable to sewage heat exchanger |
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