CN202802797U - Negative pressure steam heating equipment - Google Patents
Negative pressure steam heating equipment Download PDFInfo
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- CN202802797U CN202802797U CN 201220410711 CN201220410711U CN202802797U CN 202802797 U CN202802797 U CN 202802797U CN 201220410711 CN201220410711 CN 201220410711 CN 201220410711 U CN201220410711 U CN 201220410711U CN 202802797 U CN202802797 U CN 202802797U
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- pressure steam
- heat exchanger
- temperature
- negative pressure
- heat
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 70
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000012530 fluid Substances 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 239000000341 volatile oil Substances 0.000 claims description 4
- 241000234314 Zingiber Species 0.000 claims description 3
- 235000006886 Zingiber officinale Nutrition 0.000 claims description 3
- 235000008397 ginger Nutrition 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000001722 capsicum frutescens oleoresin Substances 0.000 claims description 2
- 229940050948 capsicum oleoresin Drugs 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 12
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 230000006866 deterioration Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract 1
- 239000012141 concentrate Substances 0.000 description 9
- 239000002904 solvent Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 240000008574 Capsicum frutescens Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model provides negative pressure steam heating equipment. The negative pressure steam heating equipment comprises a first heat exchanger and a second heat exchanger, wherein for the first heat exchanger, flows across a shell as well as high pressure steam which flows through a shell and has a first temperature and a first flowing body which flows through a heat exchange tube are subjected to heat exchange so as to generate negative pressure steam with a second temperature; the second heat exchanger and the first heat exchanger commonly form a closed space, the shell receives the negative pressure steam which is subjected to heat exchange with a concentrated solution which flows through the heat exchange tube, so that the concentrated solution absorbs heat so as to heat a material solute to a third temperature; and the negative pressure steam in the shell of the second heat exchanger releases heat energy which can be converted into the fist flowing body reflowing to the first heat exchanger. Due to the adoption of he negative pressure steam heating equipment provided by the utility model, the material solute is moderately heated to a preset temperature through two times of heat exchanging processes of the first heat exchanger and the second heat exchanger, so that the conditions such as oxidation, deterioration or material waste of the material solute in a heating process can be avoided.
Description
Technical Field
The utility model relates to a concentrated or take off incomplete application technical field, especially relate to a be used for concentrated or take off incomplete negative pressure steam heating equipment.
Background
Currently, in traditional concentration or residue removal applications, two approaches are mainly used: one is to adopt the heating mode of direct letting in high temperature steam, heat the material solute in extract or the concentrate to separation solvent and solute. However, the heating temperature in this method is difficult to control, which is often prone to oxidation, deterioration, material loss and the like for material solutes that are not resistant to high temperature; the other is the water bath method, however, the enthalpy of water is much smaller than that of high-temperature steam at the same heating temperature, which results in lower working efficiency of the water bath heating system. In addition, the water bath heating method needs to add hardware facilities such as a water storage tank and a circulating pump, so that the heating cost is high, a large amount of water resources are consumed, and the energy consumption is high.
In view of the above, a problem to be solved by the related art is how to design a novel heating apparatus and a method for using the same, so as to overcome the above defects and accelerate the heat exchange process and improve the working efficiency of the heating apparatus.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned defect that the firing equipment that is used for concentrating or takes off the incomplete among the prior art exists, the utility model provides a novel negative pressure steam heating equipment.
According to the utility model discloses an embodiment provides a negative pressure steam heating equipment, and this negative pressure steam heating equipment includes:
a first heat exchanger including a heat exchange tube and a housing, wherein a high pressure steam having a first temperature flowing through the housing exchanges heat with a first fluid flowing through the heat exchange tube, thereby converting the first fluid into a negative pressure steam having a second temperature; and
the second heat exchanger is positioned above the first heat exchanger and forms a closed space together with the first heat exchanger, and the second heat exchanger comprises a heat exchange pipe and a shell, wherein the shell of the second heat exchanger receives the negative pressure steam and exchanges heat with concentrated liquid flowing through the heat exchange pipe of the second heat exchanger, so that the concentrated liquid absorbs heat to heat material solute in the concentrated liquid to a third temperature;
and the negative pressure steam in the shell of the second heat exchanger releases heat energy, and the heat energy is converted into the first fluid and then flows back to the first heat exchanger.
In one embodiment, the negative pressure steam heating apparatus further includes a first pipeline and a second pipeline, both of which are disposed between the first heat exchanger and the second heat exchanger, the first pipeline is configured to convey the negative pressure steam output by the first heat exchanger to the second heat exchanger, and the second pipeline is configured to return the first fluid output by the second heat exchanger to the first heat exchanger.
In one embodiment, the first fluid is water or alcohol.
In one embodiment, the first temperature is greater than 100 degrees celsius, and the second temperature is between 10 degrees celsius and 90 degrees celsius. Further, the second temperature is between 40 ℃ and 50 ℃.
In one embodiment, the third temperature is less than 70 degrees celsius. Further, when the material solute is the chilli essential oil, the third temperature is 60 ℃; when the solute of the material is ginger essential oil, the third temperature is 40 ℃.
In one embodiment, the negative pressure steam heating apparatus further includes a temperature control solenoid valve and a temperature sensor, the temperature control solenoid valve is installed at a high pressure steam inlet end of the first heat exchanger, the temperature sensor is configured to detect a current temperature of the negative pressure steam transmitted from the first heat exchanger to the second heat exchanger, and the opening and closing of the temperature control solenoid valve is controlled by the current temperature of the negative pressure steam.
In one embodiment, the negative pressure steam heating device further comprises a vacuum degree solenoid valve, and when the vacuum degree in the closed space is lower than a preset vacuum degree threshold value, the vacuum degree solenoid valve is opened to perform vacuum pumping operation. Furthermore, the preset vacuum degree threshold value is any value between-0.01 MPa and-0.095 MPa.
In one embodiment, the negative pressure steam heating device further comprises a discharge port arranged at the bottom of the second heat exchanger and used for discharging the heated material solute.
In one embodiment, the negative pressure steam heating apparatus further includes a liquid outlet disposed at the bottom of the first heat exchanger for discharging the condensed first fluid.
Adopt the utility model discloses a negative pressure steam heating equipment carries out the heat exchange with high-pressure steam and first fluid such as liquid water by first heat exchanger to produce a negative pressure steam, then carry this negative pressure steam to the second heat exchanger in and carry out the heat exchange with the concentrate, make the material solute mild heating in the concentrate to predetermined temperature, consequently can avoid the material solute to appear the situations such as oxidation, rotten or material loss in the heating process. In addition, the enthalpy of the steam is far greater than that of the water, so that the heat exchange speed of the negative pressure steam heating equipment is high, and the heating efficiency is high. Moreover, the negative pressure steam heating equipment circularly heats in a high-vacuum degree closed space, the temperature of the negative pressure steam can be controlled within a certain temperature range without continuously introducing high-temperature and high-pressure steam, and the condensed water which flows back to the first heat exchanger can also participate in heat exchange circulation again, so that the resources can be greatly saved, and the energy consumption is reduced.
Drawings
Various aspects of the present invention will become more apparent to the reader after reading the detailed description of the invention with reference to the attached drawings. Wherein,
fig. 1 shows a schematic structural view of a negative pressure steam heating apparatus according to an embodiment of the present application; and
fig. 2 shows a block flow diagram of a negative pressure steam heating method according to another embodiment of the present application.
Detailed Description
In order to make the present disclosure more complete and complete, reference is made to the accompanying drawings, in which like references indicate similar elements, and to the various embodiments of the invention described below. However, it should be understood by those skilled in the art that the examples provided below are not intended to limit the scope of the present invention. In addition, the drawings are only for illustrative purposes and are not drawn to scale.
Embodiments of various aspects of the present invention are described in further detail below with reference to the figures. Before proceeding with the detailed description, the relevant principles of the shell and tube heat exchange structure will be briefly introduced. The shell-and-tube heat exchanger is also called as a tube-and-tube heat exchanger, and is a dividing wall type heat exchanger which takes the wall surface of a tube bundle sealed in a shell as a heat transfer surface.
Aiming at two fluids of cold and hot (or called high temperature and low temperature) in a heat exchanger, one fluid flows in a tube and is called a tube pass; the other flows outside the tubes, called shell side. In general, the fluid selection for the tube side and shell side generally follows: the heated fluid is preferably discharged from the bottom to the top, and the cooled fluid is preferably discharged from the top to the bottom; when steam is used for heating, steam enters from an upper pipe orifice and condensed water is discharged from a lower pipe orifice for a horizontal or vertical heat exchanger; the high-temperature fluid is suitable for the tube pass, and the low-temperature fluid is suitable for the shell pass; clean fluid shell pass, and fluid which is easy to generate blockage and scaling is suitable for passing through the tube pass.
Fig. 1 shows a schematic structural view of a negative pressure steam heating apparatus according to an embodiment of the present application.
Referring to fig. 1, the negative pressure steam heating apparatus of the present invention includes a first heat exchanger 10 and a second heat exchanger 20. The second heat exchanger 20 is located above the first heat exchanger 10, and the second heat exchanger 20 and the first heat exchanger 10 together form a closed space.
The first heat exchanger 10 includes a heat exchange pipe 104 and a shell 102. After the high pressure steam is introduced into the shell 102 of the first heat exchanger 10, the high pressure steam having the first temperature and flowing through the shell 102 exchanges heat with the first fluid flowing through the heat exchange pipe 104. At the end of the heat exchange, the high-temperature and high-pressure steam releases heat and turns into steam condensate, which is discharged through the outlet 108 of the first heat exchanger 10. At the same time, the first fluid absorbs heat and is converted to negative pressure steam at a second temperature.
In one embodiment, the first fluid is water or alcohol. According to the numerical difference between the boiling point temperature of water and the boiling point temperature of alcohol, it is easy to understand that when the first fluid is water, the temperature of the converted negative pressure water vapor is relatively high; when the first fluid is alcohol, the temperature of the converted negative pressure alcohol vapor is relatively low. Since the heating temperatures of the solutes of different materials are not necessarily the same, the kind of the first fluid should be flexibly selected according to the actual use situation.
In one embodiment, the first temperature of the high temperature and high pressure steam, such as water vapor, is greater than 100 degrees celsius, and the second temperature of the negative pressure steam is between 10 degrees celsius and 90 degrees celsius after the heat exchange between the high temperature and high pressure steam and the first fluid. Preferably, the second temperature of the negative pressure steam is between 40 ℃ and 50 ℃.
The second heat exchanger 20 is located above the first heat exchanger 10. The second heat exchanger 20 includes a heat exchange pipe 203 and a housing 201. Wherein the housing 201 of the second heat exchanger 20 receives the negative pressure steam (as indicated by the arrow direction pointing vertically upwards in fig. 1) from the first heat exchanger 10 via the first line P1, the negative pressure steam having the second temperature. Since the heat exchange tubes 203 of the second heat exchanger 20 include the concentrate (e.g., the concentrate is composed of the feed solute and the solvent), the negative pressure steam in the shell 201 exchanges heat with the concentrate in the heat exchange tubes 203. At the end of the heat exchange, taking negative pressure steam as an example of water steam, the negative pressure steam at the second temperature is converted into negative pressure steam condensate, and the negative pressure steam condensate flows back to the first heat exchanger 10 via the second pipeline P2 (as shown by the arrow direction facing vertically downward in fig. 1). Meanwhile, the solvent in the concentrated solution absorbs heat and is converted into steam and discharged from the outlet 203, and the solute in the concentrated solution can be discharged through the discharge port 207 while being mildly heated to the third temperature.
In one embodiment, the negative pressure steam heating apparatus includes a first pipeline P1 and a second pipeline P2, both disposed between the first heat exchanger 10 and the second heat exchanger 20, the first pipeline P1 is used for delivering the negative pressure steam output from the first heat exchanger 10 to the second heat exchanger 20. The second pipeline P2 is used to return the liquid substance (i.e. the substance after condensing the negative pressure steam) output from the second heat exchanger 20 to the first heat exchanger 10.
In an embodiment, after the concentrated solution in the heat exchange tube 203 of the second heat exchanger 20 exchanges heat with the negative pressure steam in the shell 201, a third temperature of the solute of the material in the concentrated solution after being heated is less than 70 ℃. For example, when the solute of the material is capsicum oleoresin, the third temperature after heating is 60 degrees celsius. For another example, when the solute is ginger essential oil, the third temperature after heating is 40 ℃. It should be noted that, since the temperature of the negative pressure steam from the first heat exchanger 10 is in the temperature range of 10 degrees celsius to 90 degrees celsius, the heating temperature of the material solute can be flexibly selected according to the specific situation, and the material solute is not oxidized, deteriorated or lost.
In one embodiment, the negative pressure steam heating apparatus further comprises a temperature control solenoid valve 106 and a temperature sensor 209 for the purpose of temperature control of the negative pressure steam. The temperature control solenoid valve 106 is installed at the high-pressure steam inlet end of the first heat exchanger 10, and the temperature sensor is installed at any position of the first pipeline P1 (preferably, at a position close to the inlet of the second heat exchanger 20) to detect the current temperature of the negative pressure steam delivered from the first heat exchanger 10 to the second heat exchanger 20, so as to control the opening and closing of the temperature control solenoid valve 106 according to the current temperature of the negative pressure steam.
When the temperature of the negative pressure steam is lower than the preset temperature required by the heat exchange, the temperature control electromagnetic valve 106 is opened, and the high-temperature high-pressure steam is continuously introduced into the shell 102 of the first heat exchanger 10, so that the temperature of the negative pressure steam converted after the heat exchange between the high-temperature high-pressure steam and the first fluid is continuously increased. When the temperature sensor 209 indicates that the current temperature of the negative pressure steam has reached the preset temperature, the temperature control solenoid valve 106 is closed. It can be seen that the temperature of the negative pressure steam fed into the second heat exchanger 20 via the first line P1 can be maintained within a relatively constant temperature range.
In an embodiment, in consideration of the vacuum degree of the enclosed space formed by the first heat exchanger 10 and the second heat exchanger 20, the negative pressure steam heating apparatus further includes a vacuum degree solenoid valve 205, and when the vacuum degree in the enclosed space is detected to be lower than a preset vacuum degree threshold value, the vacuum degree solenoid valve 205 is opened to perform a vacuum pumping operation on the enclosed space. For example, the preset vacuum degree threshold is any value from-0.01 MPa to-0.095 MPa, and the opening and closing of the vacuum degree electromagnetic valve 205 are controlled according to the comparison between the current vacuum degree and the threshold.
In addition, the negative pressure steam heating device further comprises a discharge port 207 disposed at the bottom of the second heat exchanger 20 for discharging the heated solute. And the solvent in the concentrate after heating can also be discharged from the corresponding port of the second heat exchanger 20. Similarly, the negative pressure steam heating apparatus further comprises a liquid outlet 110 disposed at the bottom of the first heat exchanger 10 for discharging the condensed first fluid.
Adopt the utility model discloses a negative pressure steam heating equipment carries out the heat exchange with high-pressure steam and first fluid such as liquid water by first heat exchanger to produce a negative pressure steam, then carry this negative pressure steam to the second heat exchanger in and carry out the heat exchange with the concentrate, make the material solute mild heating in the concentrate to predetermined temperature, consequently can avoid the material solute to appear the situations such as oxidation, rotten or material loss in the heating process. In addition, the enthalpy of the steam is far greater than that of the water, so that the heat exchange speed of the negative pressure steam heating equipment is high, and the heating efficiency is high. Moreover, the negative pressure steam heating equipment circularly heats in a high-vacuum degree closed space, the temperature of the negative pressure steam can be controlled within a certain temperature range without continuously introducing high-temperature and high-pressure steam, and the condensed water which flows back to the first heat exchanger can also participate in heat exchange circulation again, so that the resources can be greatly saved, and the energy consumption is reduced.
Fig. 2 shows a block flow diagram of a negative pressure steam heating method according to another embodiment of the present application.
Referring to fig. 2, the method corresponds to the negative pressure steam heating apparatus shown in fig. 1. In other words, the negative pressure steam heating method may also be used as the operation method of the negative pressure steam heating apparatus.
Specifically, in step S11, a first heat exchanger 10 is provided, where the first heat exchanger 10 includes a heat exchange pipe 104 and a shell 102. The shell 102 is filled with a high pressure steam having a first temperature, and the heat exchange tube contains a first fluid. Here, the first temperature is a temperature value greater than 100 degrees celsius. Then, in step S13, the high pressure steam is heat exchanged with the first fluid in the first heat exchanger 10, so as to convert the first fluid into negative pressure steam at a second temperature. Here, the second temperature is any temperature value between 10 degrees celsius and 90 degrees celsius.
Next, in step S15, a second heat exchanger 20 is provided, and the second heat exchanger 20 is located above the first heat exchanger 10 and forms a closed space together with the first heat exchanger 10. Wherein, the shell 201 of the second heat exchanger 20 receives the negative pressure steam through a first pipeline P1, and the heat exchange pipe 203 of the second heat exchanger 20 contains the concentrated solution. In step S17, the negative pressure steam is heat exchanged with the concentrated solution in the second heat exchanger 20, so that the concentrated solution absorbs heat to heat the solute therein to a third temperature. Here, the third temperature may be set to less than 70 degrees celsius. Finally, step S19 is executed to convert the negative pressure steam with released heat energy into the first fluid, which is returned to the first heat exchanger 10 via a second pipeline P2. Compared with a water bath heating mode in a traditional heating system, the negative pressure steam heating method in the embodiment has the advantages that the heating efficiency is high, and the water resource saving amount is considerable.
Hereinbefore, specific embodiments of the present invention have been described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present invention without departing from the spirit and scope of the invention. Such modifications and substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (12)
1. Negative pressure steam heating apparatus, characterized in that it comprises:
a first heat exchanger including a heat exchange tube and a housing, wherein a high pressure steam having a first temperature flowing through the housing exchanges heat with a first fluid flowing through the heat exchange tube, thereby converting the first fluid into a negative pressure steam having a second temperature; and
the second heat exchanger is positioned above the first heat exchanger and forms a closed space together with the first heat exchanger, and the second heat exchanger comprises a heat exchange pipe and a shell, wherein the shell of the second heat exchanger receives the negative pressure steam and exchanges heat with concentrated liquid flowing through the heat exchange pipe of the second heat exchanger, so that the concentrated liquid absorbs heat to heat material solute in the concentrated liquid to a third temperature;
and the negative pressure steam in the shell of the second heat exchanger releases heat energy, and the heat energy is converted into the first fluid and then flows back to the first heat exchanger.
2. The negative pressure steam heating apparatus of claim 1, further comprising a first pipeline and a second pipeline, both disposed between the first heat exchanger and the second heat exchanger, the first pipeline configured to convey the negative pressure steam output by the first heat exchanger to the second heat exchanger, the second pipeline configured to return the first fluid output by the second heat exchanger to the first heat exchanger.
3. The negative pressure steam heating apparatus of claim 2, wherein the first fluid is water or alcohol.
4. The negative pressure steam heating apparatus of claim 1, wherein the first temperature is greater than 100 degrees celsius and the second temperature is between 10 degrees celsius and 90 degrees celsius.
5. The negative-pressure steam heating apparatus of claim 4, wherein the second temperature is between 40 degrees Celsius and 50 degrees Celsius.
6. The negative pressure steam heating apparatus of claim 4, wherein the third temperature is less than 70 degrees Celsius.
7. The negative-pressure steam heating apparatus according to claim 6, wherein when the material solute is capsicum oleoresin, the third temperature is 60 degrees centigrade; when the material solute is ginger essential oil, the third temperature is 40 ℃.
8. The negative-pressure steam heating apparatus according to claim 1, further comprising a temperature-controlled solenoid valve and a temperature sensor, wherein the temperature-controlled solenoid valve is installed at the high-pressure steam inlet end of the first heat exchanger, the temperature sensor is configured to detect a current temperature of the negative-pressure steam delivered from the first heat exchanger to the second heat exchanger, and the opening and closing of the temperature-controlled solenoid valve is controlled by the current temperature of the negative-pressure steam.
9. The negative-pressure steam heating apparatus according to claim 1, further comprising a vacuum degree solenoid valve which is opened to perform a vacuum pumping operation when a vacuum degree in the sealed space is lower than a preset vacuum degree threshold.
10. The negative-pressure steam heating apparatus according to claim 9, wherein the preset vacuum degree threshold is any value between-0.01 MPa and-0.095 MPa.
11. The negative-pressure steam heating device according to claim 1, further comprising a discharge port disposed at the bottom of the second heat exchanger for discharging the heated solute.
12. The negative-pressure steam heating apparatus of claim 1, further comprising a liquid outlet disposed at a bottom of the first heat exchanger for discharging the condensed first fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220410711 CN202802797U (en) | 2012-08-17 | 2012-08-17 | Negative pressure steam heating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220410711 CN202802797U (en) | 2012-08-17 | 2012-08-17 | Negative pressure steam heating equipment |
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| Publication Number | Publication Date |
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| CN202802797U true CN202802797U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220410711 Expired - Lifetime CN202802797U (en) | 2012-08-17 | 2012-08-17 | Negative pressure steam heating equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103272391A (en) * | 2013-05-23 | 2013-09-04 | 肥城金塔机械有限公司 | Recovery device for solvents |
| CN103585774A (en) * | 2012-08-17 | 2014-02-19 | 宏芳香料（昆山）有限公司 | Negative pressure steam heating apparatus and heating method thereof |
| CN115888141A (en) * | 2022-11-04 | 2023-04-04 | 石家庄博欧金属制品有限公司 | Wax liquid recovery processing device for precision casting |
-
2012
- 2012-08-17 CN CN 201220410711 patent/CN202802797U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103585774A (en) * | 2012-08-17 | 2014-02-19 | 宏芳香料（昆山）有限公司 | Negative pressure steam heating apparatus and heating method thereof |
| CN103585774B (en) * | 2012-08-17 | 2015-05-27 | 宏芳香料（昆山）有限公司 | Negative pressure steam heating apparatus and heating method thereof |
| CN103272391A (en) * | 2013-05-23 | 2013-09-04 | 肥城金塔机械有限公司 | Recovery device for solvents |
| CN103272391B (en) * | 2013-05-23 | 2015-05-20 | 肥城金塔机械有限公司 | Recovery device for solvents |
| CN115888141A (en) * | 2022-11-04 | 2023-04-04 | 石家庄博欧金属制品有限公司 | Wax liquid recovery processing device for precision casting |
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Granted publication date: 20130320 Effective date of abandoning: 20150527 |
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