CN104848730A - Steam temperature reducing plate type heat exchange unit - Google Patents

Steam temperature reducing plate type heat exchange unit Download PDF

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Publication number
CN104848730A
CN104848730A CN201410604851.7A CN201410604851A CN104848730A CN 104848730 A CN104848730 A CN 104848730A CN 201410604851 A CN201410604851 A CN 201410604851A CN 104848730 A CN104848730 A CN 104848730A
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China
Prior art keywords
pipe
heat exchanger
temperature
type heat
moisturizing
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CN201410604851.7A
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Chinese (zh)
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不公告发明人
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高天红
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Priority to CN201410604851.7A priority Critical patent/CN104848730A/en
Publication of CN104848730A publication Critical patent/CN104848730A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a steam temperature reducing plate type heat exchange unit. The unit mainly consists of a temperature reducing heat exchanger, a plate heat exchanger, an expansion water tank, a water replenishment variable-frequency pump, a circulating pump and a control cabinet, wherein the temperature reducing heat exchanger is serially connected in front of a primary inlet of the plate heat exchanger; a primary inlet of the temperature reducing heat exchanger is connected with a steam pipe; a primary outlet of the temperature reducing heat exchanger is provided with a steam temperature reducing pipe for connecting with a primary inlet of the plate heat exchanger; a secondary inlet of the plate heat exchanger is connected with a secondary water return pipe; a flow adjusting valve is mounted on the secondary water return pipe; and the secondary water return pipe is provided with a temperature reducing water distribution pipe and a temperature reducing water return pipe in front of and behind the flow adjusting valve for connecting with the temperature reducing heat exchanger. As the temperature reducing heat exchanger is serially connected in front of the primary inlet of the plate heat exchanger, the temperature of a high-temperature steam heat source entering the plate heat exchanger is effectively reduced; and the unit has the advantages of high heating efficiency, complete protective measures, strong adaptability, good heating effect, low cost and excellent promotion and application prospect.

Description

Steam temperature reducing plate-type heat-exchange unit
Technical field
The present invention relates to technical field of heat exchange, specifically a kind of steam temperature reducing plate-type heat-exchange unit.
Background technology
Plate type heat exchanger, due to the advantage such as compact conformation, heat transfer coefficient be high, easy to install, becomes the first-selected product of current heat exchange station heat supply, at present extensive use.But, due to the sealing strip cause of plate type heat exchanger, its heat resisting temperature is less demanding the highlyest more than 170 DEG C, otherwise must not will jeopardize safety in 150 DEG C, but some cities and towns heat supply network provides thermal source great majority to be the high-temperature steam of more than 180 DEG C, restriction is used plate type heat exchanger by this.
Summary of the invention
The object of the present invention is to provide a kind of steam temperature reducing plate-type heat-exchange unit being suitable for steam and use safety.
The technical solution adopted for the present invention to solve the technical problems is: steam temperature reducing plate-type heat-exchange unit is primarily of temperature-reducing heat exchanger, plate type heat exchanger, expansion tank, moisturizing variable frequency pump, circulating pump and switch board composition, temperature-reducing heat exchanger is serially connected with before a plate type heat exchanger import, an import of temperature-reducing heat exchanger is connected with steam pipe, and steam temperature-sensing valve steam pipe is equipped with, the once outlet of temperature-reducing heat exchanger is connected with steam temperature reducing pipe, the other end of steam temperature reducing pipe is connected with plate type heat exchanger import, steam temperature reducing pipe is equipped with emergency shutdown valve, steam temperature reducing pipe was provided with temperature sensor before emergency shutdown valve, the once outlet of plate type heat exchanger is connected with condensed water discharge pipe, and on condensed water discharge pipe, steam trap is housed, the secondary import of plate type heat exchanger is connected with secondary returning water pipe, secondary returning water pipe is equipped with filter, secondary returning water pipe is equipped with circulating pump and check-valves two after the filters, walk around circulating pump and check-valves two to be provided with bypass pipe and to be connected with secondary returning water pipe, bypass pipe is equipped with check-valves three, secondary returning water pipe after the filters, safety valve and pressure sensor two is also equiped with before circulating pump and bypass pipe, secondary returning water pipe after the filters, moisturizing voltage-stabiliser tube is also connected with before circulating pump and bypass pipe, the other end of moisturizing voltage-stabiliser tube is connected with the expansion tank of setting, and moisturizing voltage-stabiliser tube is connected to water outlet bottom expansion tank, moisturizing voltage-stabiliser tube is equipped with moisturizing variable frequency pump and check-valves one, moisturizing voltage-stabiliser tube is also provided with relief tube and is connected with expansion tank after moisturizing variable frequency pump and check-valves one, and relief tube is connected to the water inlet of expansion tank top, relief tube is equipped with pressure release electromagnetic valve, expansion tank also connects filling pipe water inlet, at filling pipe, moisturizing magnetic valve is housed, filling pipe is equipped with demineralized water treating apparatus after moisturizing magnetic valve, also level sensor is equiped with in expansion tank, secondary returning water pipe is equipped with flow control valve after circulating pump and bypass pipe, and secondary returning water pipe is before flow control valve, to be connected with desuperheat return pipe with desuperheat sparge pipe respectively afterwards, desuperheat sparge pipe is connected with the secondary import of temperature-reducing heat exchanger again, and the secondary outlet of temperature-reducing heat exchanger is connected with desuperheat return pipe, desuperheat sparge pipe enters temperature-reducing heat exchanger from the secondary returning water pipe water intaking before flow control valve, circulation is formed in secondary returning water pipe after being back to flow control valve by desuperheat return pipe again, desuperheat sparge pipe is equipped with ultrasonic flowmeter, air bleeding valve is equiped with at the highest point of temperature-reducing heat exchanger and desuperheat return pipe, the secondary outlet of plate type heat exchanger is connected with secondary water-supply pipe, and on secondary water-supply pipe, be provided with temperature control transmitter and pressure sensor one.
Described steam temperature-sensing valve, temperature sensor, emergency shutdown valve, moisturizing magnetic valve, demineralized water treating apparatus, level sensor, pressure release electromagnetic valve, temperature control transmitter, pressure sensor one, ultrasonic flowmeter, moisturizing variable frequency pump, pressure sensor two, circulating pump and flow control valve are distinguished cabling line separately and are connected with switch board.
Operation principle of the present invention is, first temperature-reducing heat exchanger carries out desuperheat process to steam source, plate type heat exchanger quantity of heat given up is entered again by steam temperature reducing pipe, temperature-reducing heat exchanger also carries out preheating to a part of flow of secondary returning water pipe by desuperheat sparge pipe and desuperheat return pipe simultaneously, after entering plate type heat exchanger heating again, export from secondary water-supply pipe, the backwater of secondary water-supply pipe will be back to secondary returning water pipe and form circulation, be contained in the temperature control transmitters sense secondary water-supply pipe temperature on secondary water-supply pipe, and be provided with out water termostat value, the steam temperature-sensing valve be contained on steam pipe then enters the flow of temperature-reducing heat exchanger to plate type heat exchanger according to the automatic steam regulation pipe of water termostat value that goes out of temperature control transmitter setting, make secondary water-supply pipe temperature maintain all the time temperature control transmitter setting go out in water termostat value, the temperature sensor be contained on steam temperature reducing pipe detects the temperature that steam temperature reducing pipe enters plate type heat exchanger, and be provided with the highest protection temperature value, the highest protection temperature value being contained in the flow control valve foundation temperature sensor setting on secondary returning water pipe regulates its aperture automatically, until close, within the temperature making steam temperature reducing pipe enter plate type heat exchanger remains at the highest protection temperature value of setting, thus play the effect of protection plate type heat exchanger, when temperature sensor detects that the temperature that steam temperature reducing pipe enters plate type heat exchanger exceeds the highest protection temperature value of setting, emergency shutdown valve is closed and is cut off the thermal source entering plate type heat exchanger, be contained in pressure sensor two on secondary returning water pipe for detecting circulating pump intake pressure, and be provided with moisturizing and open pump pressure force value, moisturizing steady pressure value, super-pressure force value and water deprivation stress value four control points, when detecting that circulating pump intake pressure opens pump pressure force value lower than the moisturizing that pressure sensor two sets, moisturizing variable frequency pump starts and fetches water in expansion tank, and according to the moisturizing steady pressure value of setting, frequency-changing pressure stabilizing moisturizing is carried out to secondary returning water pipe, when moisturizing variable frequency pump runs, and secondary returning siphon pressure is stabilized in the moisturizing steady pressure value of setting, and when maintaining 30s ~ 60s, moisturizing variable frequency pump is shut down and is entered dormancy holding state, the moisturizing of moisturizing variable frequency pump terminates, when detect circulating pump intake pressure higher than setting moisturizing steady pressure value and reach setting super-pressure force value and above time, pressure release electromagnetic valve is opened sluicing to expansion tank and is stored, when pump suction supply pressure to be recycled returns to the moisturizing steady pressure value of setting, pressure release electromagnetic valve is closed, and relief tube cuts off, when detect circulating pump intake pressure lower than setting water deprivation stress value and following time, secondary returning water pipe lack of water will be judged, circulating pump stoppage protection, when pump suction supply pressure to be recycled returns to the moisturizing steady pressure value of setting, circulating pump automatically starts and recovers normal condition, meanwhile, be contained in level sensor in expansion tank for detecting expansion tank water level, and be provided with high water level point, low water level point and lack of water water level point, when level sensor detect expansion tank water level be in setting low water level point and following time, moisturizing opened by the moisturizing magnetic valve be contained on filling pipe, demineralized water treating apparatus obtains electric operation, expansion tank moisturizing is entered to prepare demineralized water, expansion tank water level rises, when level sensor detect expansion tank water level be in setting high water level point and above time, moisturizing closed electromagnetic valve, demineralized water treating apparatus dead electricity is shut down, when level sensor detect expansion tank water level be in setting lack of water water level point and following time, the moisturizing variable frequency pump run will be shut down, and report to the police, until expansion tank water level rezime and water level higher than setting low water level point more than time, lack of water is reported to the police and is eliminated, moisturizing variable frequency pump is automatically restored to normal condition.
The invention has the beneficial effects as follows; the present invention by being connected in series temperature-reducing heat exchanger before a plate type heat exchanger import; significantly reduce the temperature that high-temperature steam thermal source enters plate type heat exchanger; and heating efficiency is high; safeguard measure is complete, strong adaptability, and heating effect is good; cost is low, has and well applies the front back of the body.
Accompanying drawing explanation
Accompanying drawing 1 is structural representation of the present invention.
In figure, 1, steam pipe, 2, steam temperature-sensing valve, 3, temperature-reducing heat exchanger, 4, desuperheat return pipe, 5, air bleeding valve, 6, steam temperature reducing pipe, 7, temperature sensor, 8, emergency shutdown valve, 9, plate type heat exchanger, 10, steam trap, 11, condensed water discharge pipe, 12, filling pipe, 13, moisturizing magnetic valve, 14, demineralized water treating apparatus, 15, cable, 16, expansion tank, 17, level sensor, 18, switch board, 19, relief tube, 20, pressure release electromagnetic valve, 21, secondary water-supply pipe, 22, temperature control transmitter, 23, pressure sensor one, 24, desuperheat sparge pipe, 25, ultrasonic flowmeter, 26, secondary returning water pipe, 27, filter, 28, moisturizing voltage-stabiliser tube, 29, safety valve, 30, moisturizing variable frequency pump, 31, check-valves one, 32, pressure sensor two, 33, circulating pump, 34, check-valves two, 35, check-valves three, 36, bypass pipe, 37, flow control valve.
Detailed description of the invention
With regard to accompanying drawing 1, steam temperature reducing plate-type heat-exchange unit of the present invention is described in detail below below.
As shown in Figure 1, steam temperature reducing plate-type heat-exchange unit of the present invention is primarily of temperature-reducing heat exchanger 3, plate type heat exchanger 9, expansion tank 16, moisturizing variable frequency pump 30, circulating pump 33 and switch board 18 form, temperature-reducing heat exchanger 3 is serially connected with before plate type heat exchanger 9 imports, an import of temperature-reducing heat exchanger 3 is connected with steam pipe 1, and steam pipe 1 is equipped with steam temperature-sensing valve 2, the once outlet of temperature-reducing heat exchanger 3 is connected with steam temperature reducing pipe 6, the other end of steam temperature reducing pipe 6 is connected with an import of plate type heat exchanger 9, steam temperature reducing pipe 6 is equipped with emergency shutdown valve 8, steam temperature reducing pipe 6 was provided with temperature sensor 7 before emergency shutdown valve 8, the once outlet of plate type heat exchanger 9 is connected with condensed water discharge pipe 11, and on condensed water discharge pipe 11, steam trap 10 is housed, the secondary import of plate type heat exchanger 9 is connected with secondary returning water pipe 26, secondary returning water pipe 26 is equipped with filter 27, secondary returning water pipe 26 is equipped with circulating pump 33 and check-valves 2 34 after filter 27, walk around circulating pump 33 and check-valves 2 34 to be provided with bypass pipe 36 and to be connected with secondary returning water pipe 26, bypass pipe 36 is equipped with check-valves 3 35, secondary returning water pipe 26 is after filter 27, safety valve 29 and pressure sensor 2 32 is also equiped with before circulating pump 33 and bypass pipe 36, secondary returning water pipe 26 is after filter 27, moisturizing voltage-stabiliser tube 28 is also connected with before circulating pump 33 and bypass pipe 36, the other end of moisturizing voltage-stabiliser tube 28 is connected with the expansion tank 16 of setting, and moisturizing voltage-stabiliser tube 28 is connected to water outlet bottom expansion tank 16, moisturizing voltage-stabiliser tube 28 is equipped with moisturizing variable frequency pump 30 and check-valves 1, moisturizing voltage-stabiliser tube 28 is also provided with relief tube 19 and is connected with expansion tank 16 after moisturizing variable frequency pump 30 and check-valves 1, and relief tube 19 is connected to the water inlet of expansion tank 16 top, relief tube 19 is equipped with pressure release electromagnetic valve 20, expansion tank 16 also connects filling pipe 12 and intakes, at filling pipe 12, moisturizing magnetic valve 13 is housed, filling pipe 12 is equipped with demineralized water treating apparatus 14 after moisturizing magnetic valve 13, level sensor 17 is also equiped with in expansion tank 16, secondary returning water pipe 26 is equipped with flow control valve 37 after circulating pump 33 and bypass pipe 36, and secondary returning water pipe 26 is before flow control valve 37, to be connected with desuperheat return pipe 4 with desuperheat sparge pipe 24 respectively afterwards, desuperheat sparge pipe 24 is connected with the secondary import of temperature-reducing heat exchanger 3 again, and the secondary outlet of temperature-reducing heat exchanger 3 is connected with desuperheat return pipe 4, desuperheat sparge pipe 24 enters temperature-reducing heat exchanger 3 from secondary returning water pipe 26 water intaking before flow control valve 37, be back in secondary returning water pipe after flow control valve 37 26 by desuperheat return pipe 4 again and form circulation, desuperheat sparge pipe 24 is equipped with ultrasonic flowmeter 25, air bleeding valve 5 is equiped with at the highest point of temperature-reducing heat exchanger 3 and desuperheat return pipe 4, the secondary outlet of plate type heat exchanger 9 is connected with secondary water-supply pipe 21, and on secondary water-supply pipe 21, be provided with temperature control transmitter 22 and pressure sensor 1.
Described steam temperature-sensing valve 2, temperature sensor 7, emergency shutdown valve 8, moisturizing magnetic valve 13, demineralized water treating apparatus 14, level sensor 17, pressure release electromagnetic valve 20, temperature control transmitter 22, pressure sensor 1, ultrasonic flowmeter 25, moisturizing variable frequency pump 30, pressure sensor 2 32, circulating pump 33 and the respective cabling line 15 respectively of flow control valve 37 are connected with switch board 18.
Operation principle of the present invention is, first temperature-reducing heat exchanger 3 pairs of steam sources carry out desuperheat process, plate type heat exchanger 9 quantity of heat given up is entered again by steam temperature reducing pipe 6, temperature-reducing heat exchanger 3 also carries out preheating to a part of flow of secondary returning water pipe 26 by desuperheat sparge pipe 24 and desuperheat return pipe 4 simultaneously, after entering plate type heat exchanger 9 heating again, export from secondary water-supply pipe 21, the backwater of secondary water-supply pipe 21 will be back to secondary returning water pipe 26 and form circulation, the temperature control transmitter 22 be contained on secondary water-supply pipe 21 detects secondary water-supply pipe 21 temperature, and be provided with out water termostat value, the automatic steam regulation pipe 1 of water termostat value that goes out being contained in steam temperature-sensing valve 2 foundation temperature control transmitter 22 setting on steam pipe 1 enters the flow of temperature-reducing heat exchanger 3 to plate type heat exchanger 9, make secondary water-supply pipe 21 temperature maintain all the time temperature control transmitter 22 set go out in water termostat value, the temperature sensor 7 be contained on steam temperature reducing pipe 6 detects the temperature that steam temperature reducing pipe 6 enters plate type heat exchanger 9, and be provided with the highest protection temperature value, be contained in the highest protection temperature value that the flow control valve 37 on secondary returning water pipe 26 sets according to temperature sensor 7 and automatically regulate its aperture, until close, within the temperature making steam temperature reducing pipe 6 enter plate type heat exchanger 7 remains at the highest protection temperature value of setting, thus play the effect of protection plate type heat exchanger 9, when temperature sensor 7 detects that the temperature that steam temperature reducing pipe 6 enters plate type heat exchanger 9 exceeds the highest protection temperature value of setting, the thermal source entering plate type heat exchanger 9 is closed and cut off to emergency shutdown valve 8, be contained in pressure sensor 2 32 on secondary returning water pipe 26 for detecting circulating pump 33 intake pressure, and be provided with moisturizing and open pump pressure force value, moisturizing steady pressure value, super-pressure force value and water deprivation stress value four control points, when detecting that circulating pump 33 intake pressure opens pump pressure force value lower than the moisturizing that pressure sensor 2 32 sets, moisturizing variable frequency pump 30 starts and fetches water in expansion tank 16, and according to the moisturizing steady pressure value of setting, frequency-changing pressure stabilizing moisturizing is carried out to secondary returning water pipe 26, when moisturizing variable frequency pump 30 runs, and secondary returning water pipe 26 pressure stability is in the moisturizing steady pressure value of setting, and when maintaining 30s ~ 60s, dormancy holding state is shut down and entered to moisturizing variable frequency pump 30, moisturizing variable frequency pump 30 moisturizing terminates, when detect circulating pump 33 intake pressure higher than setting moisturizing steady pressure value and reach setting super-pressure force value and above time, pressure release electromagnetic valve 20 is opened sluicing to expansion tank 16 and is stored, when pump 33 intake pressure to be recycled returns to the moisturizing steady pressure value of setting, pressure release electromagnetic valve 20 is closed, and relief tube 19 cuts off, when detect circulating pump 33 intake pressure lower than setting water deprivation stress value and following time, secondary returning water pipe 26 lack of water will be judged, circulating pump 33 stoppage protection, when pump 33 intake pressure to be recycled returns to the moisturizing steady pressure value of setting, circulating pump 33 automatically starts and recovers normal condition, meanwhile, be contained in level sensor 17 in expansion tank 16 for detecting expansion tank 16 water level, and be provided with high water level point, low water level point and lack of water water level point, when level sensor 17 detect expansion tank 16 water level be in setting low water level point and following time, moisturizing opened by the moisturizing magnetic valve 13 be contained on filling pipe 12, demineralized water treating apparatus 14 obtains electric operation, expansion tank 16 moisturizing is entered to prepare demineralized water, expansion tank 16 water level rises, when level sensor 17 detect expansion tank 16 water level be in setting high water level point and above time, moisturizing magnetic valve 13 cuts out, demineralized water treating apparatus 14 dead electricity is shut down, when level sensor 17 detect expansion tank 16 water level be in setting lack of water water level point and following time, the moisturizing variable frequency pump 30 run will be shut down, and report to the police, until expansion tank 16 water level rezime and water level higher than setting low water level point more than time, lack of water is reported to the police and is eliminated, moisturizing variable frequency pump 30 is automatically restored to normal condition.

Claims (5)

1. a steam temperature reducing plate-type heat-exchange unit is primarily of temperature-reducing heat exchanger, plate type heat exchanger, expansion tank, moisturizing variable frequency pump, circulating pump and switch board composition, it is characterized in that, temperature-reducing heat exchanger is serially connected with before a plate type heat exchanger import, an import of temperature-reducing heat exchanger is connected with steam pipe, the once outlet of temperature-reducing heat exchanger is connected with steam temperature reducing pipe, the other end of steam temperature reducing pipe is connected with plate type heat exchanger import, steam temperature reducing pipe is equipped with emergency shutdown valve, steam temperature reducing pipe was provided with temperature sensor before emergency shutdown valve, the once outlet of plate type heat exchanger is connected with condensed water discharge pipe, and on condensed water discharge pipe, steam trap is housed, the secondary import of plate type heat exchanger is connected with secondary returning water pipe, secondary returning water pipe is equipped with filter, secondary returning water pipe is equipped with circulating pump after the filters, secondary returning water pipe is equipped with flow control valve after circulating pump, and secondary returning water pipe is before flow control valve, to be connected with desuperheat return pipe with desuperheat sparge pipe respectively afterwards, desuperheat sparge pipe is connected with the secondary import of temperature-reducing heat exchanger again, and the secondary outlet of temperature-reducing heat exchanger is connected with desuperheat return pipe, the secondary outlet of plate type heat exchanger is connected with secondary water-supply pipe, and on secondary water-supply pipe, be provided with temperature control transmitter and pressure sensor one.
2. steam temperature reducing plate-type heat-exchange unit according to claim 1, is characterized in that, steam pipe is equipped with steam temperature-sensing valve.
3. steam temperature reducing plate-type heat-exchange unit according to claim 1, it is characterized in that, secondary returning water pipe after the filters, safety valve and pressure sensor two is also equiped with before circulating pump, secondary returning water pipe after the filters, moisturizing voltage-stabiliser tube is also connected with before circulating pump, the other end of moisturizing voltage-stabiliser tube is connected with the expansion tank of setting, and moisturizing voltage-stabiliser tube is connected to water outlet bottom expansion tank, moisturizing voltage-stabiliser tube is equipped with moisturizing variable frequency pump and check-valves one, moisturizing voltage-stabiliser tube is also provided with relief tube and is connected with expansion tank after moisturizing variable frequency pump and check-valves one, and relief tube is connected to the water inlet of expansion tank top, relief tube is equipped with pressure release electromagnetic valve, expansion tank also connects filling pipe water inlet, at filling pipe, moisturizing magnetic valve is housed, filling pipe is equipped with demineralized water treating apparatus after moisturizing magnetic valve, also level sensor is equiped with in expansion tank.
4. steam temperature reducing plate-type heat-exchange unit according to claim 1, is characterized in that, desuperheat sparge pipe is equipped with ultrasonic flowmeter.
5. steam temperature reducing plate-type heat-exchange unit according to claim 1, is characterized in that, is equiped with air bleeding valve at the highest point of temperature-reducing heat exchanger and desuperheat return pipe.
CN201410604851.7A 2014-11-03 2014-11-03 Steam temperature reducing plate type heat exchange unit Pending CN104848730A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410604851.7A CN104848730A (en) 2014-11-03 2014-11-03 Steam temperature reducing plate type heat exchange unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410604851.7A CN104848730A (en) 2014-11-03 2014-11-03 Steam temperature reducing plate type heat exchange unit

Publications (1)

Publication Number Publication Date
CN104848730A true CN104848730A (en) 2015-08-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410604851.7A Pending CN104848730A (en) 2014-11-03 2014-11-03 Steam temperature reducing plate type heat exchange unit

Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105806146A (en) * 2016-04-29 2016-07-27 浙江天地环保工程有限公司 Water supplementing constant-pressure system of pipe type heat exchanger and abnormal operation control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105806146A (en) * 2016-04-29 2016-07-27 浙江天地环保工程有限公司 Water supplementing constant-pressure system of pipe type heat exchanger and abnormal operation control method

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Application publication date: 20150819