CN109764536A - A kind of dining room boiler temperature control automatic device - Google Patents
A kind of dining room boiler temperature control automatic device Download PDFInfo
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- CN109764536A CN109764536A CN201910070854.XA CN201910070854A CN109764536A CN 109764536 A CN109764536 A CN 109764536A CN 201910070854 A CN201910070854 A CN 201910070854A CN 109764536 A CN109764536 A CN 109764536A
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Abstract
The present invention relates to boiler temperature control technical fields, disclose a kind of dining room boiler temperature control automatic device, pass through the setting of air blower, when burner release combustion gas is burnt, portion of air is delivered in tray for combustion by air blower, so that air is mixed with combustion gas, to make combustion gas conflagration, but also portion of air can be delivered in combustion furnace, guarantee that combustion gas carries out full combustion in combustion furnace, and ensure the full combustion of combustion gas.The present invention by using vacuum tank and negative pressure vaporium intercombination mode, utilize the characteristic of water low boiling point under low voltage situations, the thermal medium quickly loaded in heating metal warehouse, makes the thermal medium explosive evaporation of liquid go out high-temperature water vapor, the cold water in heat exchanger tube is heated in water recovery on heat exchanger tube, achieve the purpose that hot-water supply, boiler is run under vacuum conditions simultaneously, low boiling point, and vaporization heat exchange rate is high, the thermal efficiency is effectively improved, it is effective to improve radiation and heat convection area.
Description
Technical field
The present invention relates to boiler temperature control technical field, specially a kind of dining room boiler temperature control automatic device.
Background technique
No matter electric power, machinery, metallurgy industry or chemical industry, in food service industry and industry and civil heating, boiler can
Enough to provide a large amount of thermal energy for it, therefore, in the development of national economy, boiler is most important thermal energy supply equipment.Currently,
One of the energy consumption equipment that school lunch service uses is exactly boiler, since it occupies consequence in China's energy-consuming, because
This, in order to improve the economic benefit of school lunch service, it is necessary to the energy-saving and emission-reduction work for reinforcing school lunch service's boiler, in addition to effectively reducing
Outside China's pollutant emission, additionally it is possible to reach the level for reducing energy consumption.It is energy-saving to be used as one in today that energy day is becoming tight
The inevitable direction of a era development becomes the permanent project for being worth research, and each single item measures to effectively increase energy savings and reduce material consumption that we take are all
Huge value can be createed, the every bit energy of saving can stay the wealth of next record preciousness for offspring, therefore, to promotion
The long term growth of Chinese society and the construction of harmonious society all have great importance.
Currently, school lunch service, China boiler using fuel based on common fire coal, fire coal generally can not full combustion,
Cause the operational efficiency of school lunch service, China boiler not high, so as to cause huge energy consumption.And boiler system, school lunch service
The low school lunch service's boiler capacity of operational efficiency of uniting is little, and automatic control level is low, combustion apparatus and the outmoded aging of subsidiary engine, low efficiency
Under.
Summary of the invention
The object of the present invention is to provide a kind of dining room boiler temperature control automatic devices, have reached the traditional fire coal of substitution
Mode saves energy consumption, while improving the automatic control level of boiler and the purpose of heat exchange efficiency.
To achieve the above object, the invention provides the following technical scheme: a kind of dining room boiler temperature control automatic device, including
Temperature control system, vacuum tank, link block, combustion furnace, burner, air blower, tray for combustion, electronic lighter, metal warehouse, heating agent
Medium, heat exchanger tube, attachment base, outlet pipe, water inlet pipe, vacuum pump connecting tube, vacuum meter, temperature sensor, is prevented negative pressure vaporium
The two sides of quick-fried valve and chimney, the bottom of the vacuum chamber interior wall are connect with the bottom of two link blocks respectively, the combustion furnace position
Middle position inside vacuum tank, and the two sides for the furnace bottom that burns are connect with the top of two link blocks respectively, the burning
The right side of device and middle position on the left of vacuum tank connect, and the tray for combustion is located at the left side of furnace interior, and tray for combustion
Left side is connected to by siphunculus with the right side of burner, and the air inlet of output end and burner base at the top of the air blower connects
Logical, the electronic lighter is located at the inside of tray for combustion, and the metal warehouse is located at the top of the inner wall of vacuum tank and at the top of combustion furnace
Between gap between, the thermal medium is located at the inside of metal warehouse, the bottom of the negative pressure vaporium and the top of vacuum tank
Portion's connection, the left side of the attachment base are connect with the right side of negative pressure vaporium, in the left side of the heat exchanger tube and negative pressure vaporium
The left side of wall connects, and the right side of heat exchanger tube is connected to the top and bottom on the left of attachment base respectively, one end of the outlet pipe
It is connected to the top on the right side of attachment base, one end of the water inlet pipe is connected to the bottom on the right side of attachment base, the vacuum pump connection
One end of pipe is connected to the left side at the top of negative pressure vaporium, and the vacuum meter is located at the interposition of negative pressure vaporium top left side
It sets, the temperature sensor is located at the middle position at the top of negative pressure steam chamber interior walls, and the explosion-proof valve is located at negative pressure steam ceiling
The right side in portion, the middle position on the right side of the vacuum tank are connected to one end of chimney.
The temperature control system includes main control module, backward channel module, electric furnace, thermocouple, transmitter, forward path
Module, display module, input module, alarm modules, printer module, RS serial line interface, the output end of the main control module with
The input terminal of backward channel module is electrically connected, and the output end of the backward channel module and the input terminal of electric furnace are electrically connected,
The output end of the electric furnace and the input terminal of thermocouple are electrically connected, the output end of the thermocouple and the input terminal electricity of transmitter
Property connection, the number input terminal of the output end of the transmitter and forward path module is electrically connected, the forward path module
The input terminal of output end and main control module is electrically connected, and the output end of the main control module and the input terminal of display module electrically connect
It connects, the output end of the main control module and the input terminal of alarm modules are electrically connected, the output end of the input module and master control
The input terminal of module is electrically connected, and the input terminal of the printer module and the output end of main control module are electrically connected, the RS
The output end and input terminal of serial line interface are electrically connected with the output end of main control module and input terminal respectively.
Preferably, the bottom of the vacuum tank is connected with pedestal, and the bottom of pedestal is connected with non-slip mat.
Preferably, the shape of the heat exchanger tube is U-tube shape, and the material of heat exchanger tube can be one in siphunculus or aluminum pipe
Kind.
Preferably, the transversal cross-section shape of the chimney is circle, and shield is connected at the top of chimney.
Preferably, the backward channel module includes synchronization/transposition module and silicon-controlled/Elema module, and synchronization/shifting
The output end of item module and the input terminal of silicon-controlled/Elema module are electrically connected.
Preferably, the forward path module includes A/D conversion module and compensation, transformation and amplification module, and compensates, becomes
It changes and the input terminal of the output end of amplification module and A/D conversion module is electrically connected.
The present invention provides a kind of dining room boiler temperature control automatic devices.Have it is following the utility model has the advantages that
(1), the present invention is by the intercombination mode by using vacuum tank and negative pressure vaporium, using water in low voltage situations
The characteristic of lower low boiling point quickly heats the thermal medium loaded in metal warehouse, the thermal medium explosive evaporation of liquid is made to go out high temperature
The cold water in heat exchanger tube is heated in water vapour, water recovery on heat exchanger tube, achievees the purpose that hot-water supply, while boiler is true
It is run under dummy status, low boiling point, vaporization heat exchange rate is high, effectively improves the thermal efficiency, heat exchange property is good, effectively improves spoke
It penetrates and heat convection area.
(2), the present invention is by the setting of air blower, and when burner release combustion gas is burnt, air blower will be a part of
In air delivery to tray for combustion, so that air is mixed with combustion gas, to make combustion gas conflagration, but also can be by one
Divide in air delivery to combustion furnace, guarantee that combustion gas carries out full combustion in combustion furnace, and ensure the full combustion of combustion gas,
Improve the combustion rate of combustion gas.
(3), the present invention is by detecting and being converted into faint voltage signal, temperature pick-up by thermocouple, temperature sensor
After this weak signal is carried out gamma correction and voltage amplification by device, it is converted by the A/D converter of forward path inside modules
At digital quantity, on the one hand this digital quantity will after digital filtering, error correction, scale conversion, linear fit, the processing such as table look-up
The temperature of furnace interior shown through the display module on man-machine panel, on the other hand by the temperature value with by controlling value by
The set temperature value of keyboard input compares, and according to the size of its deviation, is supplied to control algolithm and carries out operation, finally output moves
Phase control pulse triggers controlled silicon conducting after amplification, i.e. control resistance furnace mean power, reaches control furnace interior temperature
Purpose, if actually measured temperature value has been more than temperature range required by the system, main control module is just sent out to alarm modules
It instructs out, system is alarmed.
Detailed description of the invention
Fig. 1 is the front section view figure of structure of the invention；
Fig. 2 is the system structural framework figure of structure of the invention temperature control system；
Fig. 3 is the automatic temperature controlling circuit figure of structure of the invention boiler.
In figure: 1 vacuum tank, 2 link blocks, 3 combustion furnaces, 4 burners, 5 air blowers, 6 tray for combustions, 7 electronic lighters, 8 gold medals
Belong to storehouse, 9 thermal mediums, 10 negative pressure vaporiums, 11 heat exchanger tubes, 12 attachment bases, 13 outlet pipes, 14 water inlet pipes, the connection of 15 vacuum pumps
Behind pipe, 16 vacuum meters, 17 temperature sensors, 18 explosion-proof valves, 19 chimneys, 20 pedestals, 0 temperature control system, 01 main control module, 02
To channel module, 03 electric furnace, 04 thermocouple, 05 transmitter, 06 forward path module, 07 display module, 08 input module, 09 police
Report module, 010 printer module, 011RS232 serial line interface.
Specific embodiment
As shown in Figure 1-3, the present invention provides a kind of technical solution: a kind of dining room boiler temperature control automatic device, including temperature
Spend control system 0, vacuum tank 1, link block 2, combustion furnace 3, burner 4, air blower 5, tray for combustion 6, electronic lighter 7, metal
Storehouse 8, thermal medium 9, negative pressure vaporium 10, heat exchanger tube 11, attachment base 12, outlet pipe 13, water inlet pipe 14, vacuum pump connecting tube
15, vacuum meter 16, temperature sensor 17, explosion-proof valve 18 and chimney 19, the two sides of the bottom of 1 inner wall of vacuum tank respectively with two companies
The bottom for connecing block 2 is fixedly connected, and combustion furnace 3 is located at the middle position inside vacuum tank 1, and the two sides difference of 3 bottom of combustion furnace
It is fixedly connected with the top of two link blocks 2, the right side of burner 4 is fixedly connected with the middle position in 1 left side of vacuum tank, is burnt
Disk 6 is located at the left side inside combustion furnace 3, and the left side of tray for combustion 6 is connected to by siphunculus with the right side of burner 4, and air blower 5 pushes up
The output end in portion is connected to the air inlet of 4 bottom of burner, and electronic lighter 7 is located at the inside of tray for combustion 6, and metal warehouse 8 is located at
Between gap at the top of the inner wall of vacuum tank 1 between 3 top of combustion furnace, thermal medium 9 is located at the inside of metal warehouse 8, negative pressure
The bottom of vaporium 10 is connected to the top of vacuum tank 1, and the left side of attachment base 12 is fixedly connected with the right side of negative pressure vaporium 10,
Be fixedly connected on the left of the left side of heat exchanger tube 11 and 10 inner wall of negative pressure vaporium, and the right side of heat exchanger tube 11 respectively with attachment base 12
The top and bottom in left side are connected to, and one end of outlet pipe 13 is connected to the top on 12 right side of attachment base, one end of water inlet pipe 14 and
One end of the bottom connection on 12 right side of attachment base, vacuum pump connecting tube 15 is connected to the left side at 10 top of negative pressure vaporium, vacuum
Table 16 is located at the middle position of 10 top left side of negative pressure vaporium, and temperature sensor 17 is located at the top of 10 inner wall of negative pressure vaporium
Middle position, explosion-proof valve 18 are located at the right side at 10 top of negative pressure vaporium, the middle position and the one of chimney 19 on 1 right side of vacuum tank
End connection, the bottom of vacuum tank 1 is fixedly connected with pedestal 20, and the bottom of pedestal 20 is fixedly connected with non-slip mat, heat exchanger tube 11
Shape be U-tube shape, and the material of heat exchanger tube 11 can be one of siphunculus or aluminum pipe, the transversal cross-section shape of chimney 19
Top for circle, and chimney 19 is fixedly connected with shield.
Temperature control system 0 include main control module 01, backward channel module 02, electric furnace 03, thermocouple 04, transmitter 05,
Forward path module 06, display module 07, input module 08, alarm modules 09, printer module 010, RS232 serial line interface
011, the output end of main control module 01 and the input terminal of backward channel module 02 are electrically connected, the output end of backward channel module 02
It is electrically connected with the input terminal of electric furnace 03, the output end of electric furnace 03 and the input terminal of thermocouple 04 are electrically connected, thermocouple 04
The input terminal of output end and transmitter 05 is electrically connected, the output end of transmitter 05 and the number input terminal electricity of forward path module 06
Property connection, the input terminal of the output end of forward path module 06 and main control module 01 is electrically connected, the output end of main control module 01
It being electrically connected with the input terminal of display module 07, the output end of main control module 01 and the input terminal of alarm modules 09 are electrically connected,
The output end of input module 08 and the input terminal of main control module 01 are electrically connected, the input terminal and master control mould of printer module 010
The output end of block 01 is electrically connected, the output end and input terminal of RS232 serial line interface 011 output end with main control module 01 respectively
It is electrically connected with input terminal, backward channel module 02 includes synchronization/transposition module and silicon-controlled/Elema module, and synchronization/shifting
The output end of item module and the input terminal of silicon-controlled/Elema module are electrically connected, and forward path module 06 includes A/D modulus of conversion
Block and compensation, transformation and amplification module, and the input terminal electricity of compensation, the output end of transformation and amplification module and A/D conversion module
Property connection.
According to Fig.3, temperature detection control circuit is by temperature sensor RT, resistor R1~R5, potentiometer RP1, RP2
It is formed with operational amplifier integrated circuit IC1 (N1 and N2), trigger is by the NAND gate D1 inside four NAND gate Integrated circuit IC 2
~D4 composition, control execution circuit are made of resistor R7, transistor V, diode VD and relay K, working status indication electricity
Current-limiting resistor R6 and light emitting diode VL composition is routed, power circuit is by power switch S, power transformer T, rectifier bridge stack
UR, circuit of three-terminal voltage-stabilizing integrated IC3 and filter condenser C1, C2 composition.
Power on switch S, alternating current 220V voltage is depressured, after UR rectification, C1 filtering and IC3 pressure stabilizing through T, produces at the both ends C2
Raw+5V voltage, supplying temperature detect control circuit, trigger and control execution circuit, temperature sensor RT and resistor R1 group
At temperature sensing circuit, potentiometer RP1 and resistor R2, R3 form lowest temperature initialization circuit, and RP2 and M, R5 are formed in temperature
Initialization circuit is limited, the resistance value of temperature sensor RT reduces as the temperature rises, when water temperature is more than set water temperature in boiler
When upper limit value (such as 85 DEG C), C point (the reverse phase input end of M and the positive input end of N2) voltage will be above B point voltage, N2 output
High level makes the output end D point of trigger become high level, and V is full logical, and K is attracted, and normally open contact is connected, and passes through ac contactor
Device connects the working power of water pump, and water pump starts running, and starts the cycle over hot water, with the decline of water temperature, the resistance value of RT by
It is cumulative big, gradually reduce C point voltage, when water temperature is lower than lower limit value (such as 50 DEG C) of set temperature, C point voltage be will be less than
A point voltage, N1 export high level, and D point is made to become low level, V cut-off, and K discharges, and water pump shuts down, this kind of mode can lead to
The temperature value for crossing setting can voluntarily control starting water pump, hot water is made to start to follow after the water temperature in boiler burns 85 DEG C or so
Ring, which carries out heat exchange, can voluntarily control and switch off the pump when circulating water temperature slowly drops to 50 DEG C or so, stop hot water and follow
Ring continues burning boiler, when water temperature is raised to 85 DEG C again, can voluntarily control starting water pump and be recycled, instead of traditional pot
Furnaceman needs running check boiler temperature, then decides whether the usage mode for starting and stopping water pump, so that avoiding will be in boiler
Water it is boiled and the phenomenon that cause in entire heating system pressure increase to cause security risk, thereby reduce labor intensity, mention
Whole automatic control level is risen.
Can to sum up obtain: the present invention is existed by the intercombination mode by using vacuum tank 1 and negative pressure vaporium 10 using water
The characteristic of low boiling point under low voltage situations quickly heats the thermal medium 9 loaded in metal warehouse 8, the thermal medium 9 of liquid is made to boil
High-temperature water vapor is evaporated, water recovery heats the cold water in heat exchanger tube on heat exchanger tube 11, achievees the purpose that hot-water supply,
Boiler is run under vacuum conditions simultaneously, low boiling point, and vaporization heat exchange rate is high, effectively improves the thermal efficiency, and heat exchange property is good,
Effective to improve radiation and heat convection area, the present invention passes through the setting of air blower 5, is fired when burner 4 discharges combustion gas
When burning, portion of air is delivered in tray for combustion 6 by air blower 5, so that air is mixed with combustion gas, to keep combustion gas quick
Burning, but also portion of air can be delivered in combustion furnace 3, guarantee that combustion gas carries out full combustion in combustion furnace 3, and
And ensure the full combustion of combustion gas, the combustion rate of combustion gas is improved, the present invention by thermocouple 04, temperature sensor 17 by examining
Faint voltage signal is surveyed and is converted into, after this weak signal is carried out gamma correction and voltage amplification by temperature transmitter 05, by
A/D converter inside forward path module 06 converts thereof into digital quantity, this digital quantity is through digital filtering, error correction, mark
Degree transformation, linear fit, after tabling look-up etc. and handling, on the one hand by the temperature inside combustion furnace 3 through the display module on man-machine panel
07 is shown, on the other hand by the temperature value compared with the set temperature value inputted by controlling value by keyboard, according to its deviation
The size of value is supplied to control algolithm and carries out operation, finally exports phase shifting control pulse, controlled silicon conducting is triggered after amplification, i.e.,
Resistance furnace mean power is controlled, achievees the purpose that control 3 internal temperature of combustion furnace, if actually measured temperature value has been more than this
Temperature range required by system, main control module 01 are just issued to alarm modules 09 and are instructed, and system is alarmed.
Claims (6)
1. a kind of dining room boiler temperature control automatic device, including temperature control system (0), vacuum tank (1), link block (2), burning
Furnace (3), burner (4), air blower (5), tray for combustion (6), electronic lighter (7), metal warehouse (8), thermal medium (9), negative pressure
Vaporium (10), heat exchanger tube (11), attachment base (12), outlet pipe (13), water inlet pipe (14), vacuum pump connecting tube (15), vacuum
Table (16), temperature sensor (17), explosion-proof valve (18) and chimney (19), it is characterised in that: the bottom of vacuum tank (1) inner wall
Two sides connect respectively with the bottom of two link blocks (2), the combustion furnace (3) is located at the internal middle position of vacuum tank (1),
And the two sides of combustion furnace (3) bottom are connect with the top of two link blocks (2) respectively, the right side of the burner (4) and vacuum
Middle position connection on the left of case (1), the tray for combustion (6) are located at the internal left side of combustion furnace (3), and a left side for tray for combustion (6)
Side is connected to by siphunculus with the right side of burner (4), the output end at the top of the air blower (5) and burner (4) bottom into
Air port connection, the electronic lighter (7) are located at the inside of tray for combustion (6), and the metal warehouse (8) is located at the interior of vacuum tank (1)
Between gap between at the top of wall and at the top of combustion furnace (3), the thermal medium (9) is located at the inside of metal warehouse (8), described negative
The bottom of pressure vaporium (10) is connected to the top of vacuum tank (1), the left side and negative pressure vaporium (10) of the attachment base (12)
Right side connection, the left side of the heat exchanger tube (11) connect with the left side of negative pressure vaporium (10) inner wall, and heat exchanger tube (11)
Right side is connected to the top and bottom on the left of attachment base (12) respectively, on the right side of one end and attachment base (12) of the outlet pipe (13)
Top connection, one end of the water inlet pipe (14) is connected to the bottom on the right side of attachment base (12), the vacuum pump connecting tube
(15) one end is connected to the left side at the top of negative pressure vaporium (10), and the vacuum meter (16) is located at the top of negative pressure vaporium (10)
The middle position in left side, the temperature sensor (17) is located at the middle position at the top of negative pressure vaporium (10) inner wall, described anti-
Quick-fried valve (18) is located at the right side at the top of negative pressure vaporium (10), the middle position on the right side of the vacuum tank (1) and chimney (19)
One end connection；
The temperature control system (0) include main control module (01), backward channel module (02), electric furnace (03), thermocouple (04),
Transmitter (05), forward path module (06), display module (07), input module (08), alarm modules (09), printer module
(010), RS232 serial line interface (011), the output end of the main control module (01) and the input terminal electricity of backward channel module (02)
Property connection, the input terminal of the output end of the backward channel module (02) and electric furnace (03) is electrically connected, the electric furnace (03)
Output end and the input terminal of thermocouple (04) are electrically connected, the output end of the thermocouple (04) and the input terminal of transmitter (05)
It is electrically connected, the output end of the transmitter (05) and the number input terminal of forward path module (06) are electrically connected, the forward direction
The output end of channel module (06) and the input terminal of main control module (01) are electrically connected, the output end of the main control module (01) with
The input terminal of display module (07) is electrically connected, the output end of the main control module (01) and the input terminal electricity of alarm modules (09)
Property connection, the input terminal of the output end of the input module (08) and main control module (01) is electrically connected, the printer module
(010) input terminal and the output end of main control module (01) are electrically connected, the output end of the RS232 serial line interface (011) and
Input terminal is electrically connected with the output end of main control module (01) and input terminal respectively.
2. a kind of dining room boiler temperature control automatic device according to claim 1, it is characterised in that: the vacuum tank (1)
Bottom be connected with pedestal (20), and the bottom of pedestal (20) is connected with non-slip mat.
3. a kind of dining room boiler temperature control automatic device according to claim 1, it is characterised in that: the heat exchanger tube (11)
Shape be U-tube shape, and the material of heat exchanger tube (11) can be one of siphunculus or aluminum pipe.
4. a kind of dining room boiler temperature control automatic device according to claim 1, it is characterised in that: the chimney (19)
Transversal cross-section shape is circle, and is connected with shield at the top of chimney (19).
5. a kind of dining room boiler temperature control automatic device according to claim 1, it is characterised in that: the backward channel mould
Block (02) includes synchronization/transposition module and silicon-controlled/Elema module, and the output end of synchronization/transposition module and silicon-controlled/silicon
The input terminal of carbon-point module is electrically connected.
6. a kind of dining room boiler temperature control automatic device according to claim 1, it is characterised in that: the forward path mould
Block (06) includes A/D conversion module and compensation, transformation and amplification module, and is compensated, the output end and A/D of transformation and amplification module
The input terminal of conversion module is electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910070854.XA CN109764536A (en) | 2019-01-25 | 2019-01-25 | A kind of dining room boiler temperature control automatic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910070854.XA CN109764536A (en) | 2019-01-25 | 2019-01-25 | A kind of dining room boiler temperature control automatic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109764536A true CN109764536A (en) | 2019-05-17 |
Family
ID=66455145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910070854.XA Pending CN109764536A (en) | 2019-01-25 | 2019-01-25 | A kind of dining room boiler temperature control automatic device |
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| CN207894017U (en) * | 2017-12-22 | 2018-09-21 | 广州航优新能源科技有限公司 | A kind of boiler of environmental protection and energy saving |
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2019
- 2019-01-25 CN CN201910070854.XA patent/CN109764536A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2448623A (en) * | 2004-04-08 | 2008-10-22 | Autoflame Eng Ltd | Assessing the level of total dissolved solids in a steam boiler |
| CN202675614U (en) * | 2012-06-20 | 2013-01-16 | 天津泰铭热力装备股份有限公司 | High-temperature vacuum superconducting phase-change heating furnace |
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| CN205957460U (en) * | 2016-08-18 | 2017-02-15 | 北京华世尔锅炉压力容器有限公司 | Electrovacuum phase transition boiler |
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| CN207894017U (en) * | 2017-12-22 | 2018-09-21 | 广州航优新能源科技有限公司 | A kind of boiler of environmental protection and energy saving |
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Application publication date: 20190517 |
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| RJ01 | Rejection of invention patent application after publication |