CN220541419U - Heat pump evaporator capable of automatically discharging non-condensable gas - Google Patents
Heat pump evaporator capable of automatically discharging non-condensable gas Download PDFInfo
- Publication number
- CN220541419U CN220541419U CN202223442317.XU CN202223442317U CN220541419U CN 220541419 U CN220541419 U CN 220541419U CN 202223442317 U CN202223442317 U CN 202223442317U CN 220541419 U CN220541419 U CN 220541419U
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- tube
- heat exchange
- condensable gas
- heat pump
- tube shell
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- 238000007599 discharging Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 8
- 238000001704 evaporation Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 7
- 238000002955 isolation Methods 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 5
- 238000009835 boiling Methods 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000007738 vacuum evaporation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The utility model discloses a heat pump evaporator capable of automatically discharging non-condensable gas, which comprises a tube shell and a heat exchange tube group arranged on the inner side of the tube shell; two ends of the heat exchange tube group are connected to tube side flanges of the tube shell; the upper and lower opposite angles of the tube shell are respectively provided with a steam inlet flange and a liquid discharge flange; the liquid discharge flange is connected with an inlet of the vacuum pump; a reserved space is arranged between the top of the heat exchange tube group and the top of the inner side of the tube shell, and a shielding plate is arranged on the inner side of the heat exchange tube group close to the liquid discharge flange; the shielding plate is welded with the upper part of the inner wall of the tube shell; a non-condensable gas discharge port is arranged above the liquid discharge flange of the tube shell; the non-condensable gas discharge port is integrated into the vacuum pump inlet through an electric control discharge valve; the electric control discharge valve is connected to the controller. The heat pump evaporator capable of automatically discharging the non-condensable gas can ensure that the non-condensable gas of the heat pump evaporator is discharged in time, and the evaporator is kept to operate in a high-efficiency state all the time.
Description
Technical Field
The utility model particularly relates to a heat pump evaporator capable of automatically discharging non-condensable gas, and belongs to the technical field of heat pump evaporators.
Background
In the field of low-temperature vacuum evaporation of a salt-containing wastewater heat pump, two conditions exist, namely, a small amount of non-condensable gas is contained in evaporated secondary steam, so that the heat transfer efficiency of a heat pump evaporator can be affected, and the generation of the non-condensable gas mainly has two conditions:
1. because the low-temperature evaporation system of the heat pump is vacuum evaporation, the external air can be sucked into the system from the joints such as the flange of the device, and then gradually accumulated at the upper part of the evaporator;
2. in the industries of chemical industry and the like, the components in the wastewater are complex, and organic matters or inorganic matters with low boiling points often exist, so that the wastewater is easily evaporated into gas, and the gas becomes non-condensable gas in a heat pump evaporator;
because the heat transfer of the heat exchanger is greatly influenced by the non-condensable gas, the non-condensable gas must be discharged in time to ensure that the heat pump evaporator is always kept in a high-efficiency running state.
Disclosure of Invention
In order to solve the problems, the utility model provides a heat pump evaporator capable of automatically discharging non-condensable gas, which can ensure that the non-condensable gas of the heat pump evaporator is discharged in time, so that the evaporator can always maintain to operate in a high-efficiency state.
The utility model relates to a heat pump evaporator capable of automatically discharging non-condensable gas, which comprises a tube shell and a heat exchange tube group arranged on the inner side of the tube shell; two ends of the heat exchange tube group are connected to tube side flanges of the tube shell; the upper and lower opposite angles of the tube shell are respectively provided with a steam inlet flange and a liquid discharge flange; the liquid discharge flange is connected with an inlet of the vacuum pump; a reserved space is arranged between the top of the heat exchange tube group and the top of the inner side of the tube shell, and a shielding plate is arranged on the inner side of the heat exchange tube group close to the liquid discharge flange; the shielding plate is welded with the upper part of the inner wall of the tube shell; a non-condensable gas discharge port is arranged above the liquid discharge flange of the tube shell; the non-condensable gas discharge port is integrated into the vacuum pump inlet through an electric control discharge valve; the electric control discharge valve is connected to the controller.
The utility model relates to a heat pump evaporator capable of automatically discharging non-condensable gas, which is similar to the design of a conventional dry evaporator in refrigeration and heat pump industry, adopts a horizontal structure, and adopts a refrigerant tube pass and a heating medium (secondary steam) shell pass, and the improvement of the utility model is that: a larger space is reserved at the upper part of the evaporator, no heat exchange tube is arranged, so that the non-condensable gas is easily gathered, and the height of the space at the upper part without a calandria is designed to be 5-10 cm; the secondary steam of the heat pump evaporator enters from a steam inlet flange of the heat exchanger and advances to the other side, and the other side forms an isolation area by adding a shielding plate so as to be beneficial to the accumulation of non-condensable gas, and a non-condensable gas discharge port is designed at the upper part of the isolation area of the evaporator; the secondary steam condensate is discharged from a liquid discharge flange of the evaporator; the non-condensable gas discharge port is provided with an electric control discharge valve, and a discharge pipe is led to a vacuum pump of the heat pump evaporation device, so that the shell side of the evaporator is in a vacuum state, and the non-condensable gas can be pumped away through the vacuum pump; the discharge of the non-condensable gas of the heat pump evaporator is performed when one of the following conditions is satisfied:
first, the discharge is timed, such as once every hour;
and secondly, the efficiency of the heat pump evaporator is gradually reduced, and when the evaporation pressure of the refrigerant is reduced by more than 30% than the normal value.
Further, the heat exchange tube group is a tube array heat exchange group with an inlet and an outlet at two ends or a double-flow heat exchange group with an inlet and an outlet at one side.
Further, the shielding plate is a semicircular shielding plate or an arc shielding plate; the arc-shaped outer edge of the semicircular baffle plate or the arc-shaped baffle plate is welded with the inner wall of the tube shell, and when the baffle plate is the arc-shaped baffle plate; the inner arc surface of the arc-shaped baffle plate is attached to the periphery of the tube row at the upper part of the heat exchange tube group.
Further, the space height of the reserved space is 5-10 cm.
Further, an outer convex bin is arranged above the drain flange of the tube shell; the non-condensable gas discharge port is arranged on the outer convex bin, and the isolation area space is enlarged through the outer convex bin.
Compared with the prior art, the heat pump evaporator capable of automatically discharging the non-condensable gas is suitable for direct heat pump evaporation concentration of the wastewater containing more low-boiling substances, when the salt-containing wastewater contains more low-boiling substances, the non-condensable gas amount is more in the evaporation concentration process, the non-condensable gas can be rapidly discharged, and the low-boiling substances do not need to be pretreated and removed; the noncondensable gas of the heat pump evaporator is timely discharged, so that the evaporator can always maintain to operate in a high-efficiency state.
Drawings
Fig. 1 is a schematic view of an evaporator of a tube array heat exchange unit according to the present utility model.
Fig. 2 is a schematic view of the evaporator structure of the dual-pass heat exchange unit of the present utility model.
Fig. 3 is a schematic view of an evaporator with a shell and tube as a convex bin.
Fig. 4 is a schematic view of an evaporator with a semicircular baffle plate as a shielding plate according to the present utility model.
Fig. 5 is a schematic view of an evaporator with a baffle plate of the present utility model being an arc-shaped baffle plate.
Detailed Description
Examples
The heat pump evaporator for automatically discharging non-condensable gas as shown in fig. 1 to 5 comprises a tube shell 1 and a heat exchange tube group 2 arranged on the inner side of the tube shell; the two ends of the heat exchange tube group 2 are connected to tube side flanges 3 of the tube shell 1; the upper and lower opposite angles of the tube shell 1 are respectively provided with a steam inlet flange 4 and a liquid discharge flange 5; the liquid discharge flange 4 is connected with an inlet of the vacuum pump 6; a reserved space 7 is arranged between the top of the heat exchange tube group 2 and the top of the inner side of the tube shell 1, and a shielding plate 8 is arranged on the inner side of the heat exchange tube group 2 close to the liquid discharge flange; the shielding plate 8 is welded with the upper part of the inner wall of the tube shell 1; a non-condensable gas discharge port 9 is arranged above the liquid discharge flange 4 of the tube shell 1; the non-condensable gas discharge port 9 is integrated into the inlet of the vacuum pump 6 through an electrically controlled discharge valve 10; the electrically controlled discharge valve 10 is connected to a controller.
The utility model relates to a heat pump evaporator capable of automatically discharging non-condensable gas, which is similar to the design of a conventional dry evaporator in refrigeration and heat pump industry, adopts a horizontal structure, and adopts a refrigerant tube pass and a heating medium (secondary steam) shell pass, and the improvement of the utility model is that: a larger space is reserved at the upper part of the evaporator, no heat exchange tube is arranged, so that the non-condensable gas is easily gathered, and the height of the space at the upper part without a calandria is designed to be 5-10 cm; the secondary steam of the heat pump evaporator enters from a steam inlet flange of the heat exchanger and advances to the other side, and the other side forms an isolation area by adding a shielding plate so as to be beneficial to the accumulation of non-condensable gas, and a non-condensable gas discharge port is designed at the upper part of the isolation area of the evaporator; the secondary steam condensate is discharged from a liquid discharge flange of the evaporator; the non-condensable gas discharge port is provided with an electric control discharge valve, and a discharge pipe is led to a vacuum pump of the heat pump evaporation device, so that the shell side of the evaporator is in a vacuum state, and the non-condensable gas can be pumped away through the vacuum pump; the discharge of the non-condensable gas of the heat pump evaporator is performed when one of the following conditions is satisfied: first, the discharge is timed, such as once every hour; and secondly, the efficiency of the heat pump evaporator is gradually reduced, and when the evaporation pressure of the refrigerant is reduced by more than 30% than the normal value.
Wherein the heat exchange tube group 2 is a tube array heat exchange group with an inlet and an outlet at two ends, or a double-flow heat exchange group with an inlet and an outlet at one side. The shielding plate 8 is a semicircular plate or an arc-shaped plate; the arc-shaped outer edge of the semicircular baffle plate or the arc-shaped baffle plate is welded with the inner wall of the tube shell, and when the baffle plate is the arc-shaped baffle plate; the inner arc surface of the arc baffle is attached to the periphery of the tube row at the upper part of the heat exchange tube group 2. The space height of the reserved space 7 is 5-10 cm. The pipe shell 1 is provided with an outer convex bin 11 above the liquid discharge flange; the non-condensable gas discharge port 9 is arranged on the outer convex bin 11, and the isolation area space is enlarged through the outer convex bin.
The above embodiments are merely preferred embodiments of the present utility model, and all changes and modifications that come within the meaning and range of equivalency of the structures, features and principles of the utility model are therefore intended to be embraced therein.
Claims (5)
1. The heat pump evaporator capable of automatically discharging non-condensable gas comprises a tube shell and a heat exchange tube group arranged on the inner side of the tube shell; two ends of the heat exchange tube group are connected to tube side flanges of the tube shell; the upper and lower opposite angles of the tube shell are respectively provided with a steam inlet flange and a liquid discharge flange; the liquid discharge flange is connected with an inlet of the vacuum pump; the method is characterized in that: a reserved space is arranged between the top of the heat exchange tube group and the top of the inner side of the tube shell, and a shielding plate is arranged on the inner side of the heat exchange tube group close to the liquid discharge flange; the shielding plate is welded with the upper part of the inner wall of the tube shell; a non-condensable gas discharge port is arranged above the liquid discharge flange of the tube shell; the non-condensable gas discharge port is integrated into the vacuum pump inlet through an electric control discharge valve; the electric control discharge valve is connected to the controller.
2. The heat pump evaporator for automatically discharging non-condensable gases according to claim 1, wherein: the heat exchange tube group is a tube array heat exchange group with an inlet and an outlet at two ends or a double-flow heat exchange group with an inlet and an outlet at one side.
3. The heat pump evaporator for automatically discharging non-condensable gases according to claim 1, wherein: the shielding plate is a semicircular baffle or an arc-shaped baffle; the arc-shaped outer edge of the semicircular baffle plate or the arc-shaped baffle plate is welded with the inner wall of the tube shell, and when the baffle plate is the arc-shaped baffle plate; the inner arc surface of the arc-shaped baffle plate is attached to the periphery of the tube row at the upper part of the heat exchange tube group.
4. The heat pump evaporator for automatically discharging non-condensable gases according to claim 1, wherein: the space height of the reserved space is 5-10 cm.
5. The heat pump evaporator for automatically discharging non-condensable gases according to claim 1, wherein: the pipe shell is provided with an outer convex bin above the liquid discharge flange; the non-condensable gas discharge port is arranged on the outer convex bin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223442317.XU CN220541419U (en) | 2022-12-22 | 2022-12-22 | Heat pump evaporator capable of automatically discharging non-condensable gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223442317.XU CN220541419U (en) | 2022-12-22 | 2022-12-22 | Heat pump evaporator capable of automatically discharging non-condensable gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220541419U true CN220541419U (en) | 2024-02-27 |
Family
ID=89962203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223442317.XU Active CN220541419U (en) | 2022-12-22 | 2022-12-22 | Heat pump evaporator capable of automatically discharging non-condensable gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220541419U (en) |
-
2022
- 2022-12-22 CN CN202223442317.XU patent/CN220541419U/en active Active
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