CN220530690U - Switchable MVR and multi-effect dual-purpose evaporator - Google Patents
Switchable MVR and multi-effect dual-purpose evaporator Download PDFInfo
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- CN220530690U CN220530690U CN202321795861.4U CN202321795861U CN220530690U CN 220530690 U CN220530690 U CN 220530690U CN 202321795861 U CN202321795861 U CN 202321795861U CN 220530690 U CN220530690 U CN 220530690U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000001704 evaporation Methods 0.000 claims abstract description 52
- 230000008020 evaporation Effects 0.000 claims abstract description 51
- 238000004891 communication Methods 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 230000006872 improvement Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012824 chemical production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Abstract
The utility model relates to a switchable MVR and multi-effect dual-purpose evaporator, and belongs to the technical field of chemical equipment. The evaporator comprises evaporator main body equipment, a plurality of condensate water tanks and a plurality of pumps which are required by an MVR evaporation system and a multi-effect evaporation system; the device is also provided with a compressor required by the MVR evaporation system, a condenser and a vacuum pump required by the multi-effect evaporation system. The device of the utility model can be used as an MVR system under normal conditions, thereby reducing the consumption of the generated steam and having lower operation cost. When the compressor is in fault and needs to be overhauled for a long time, the equipment is switched into multi-effect use, so that the operation of a system can be ensured, and the production continuity is ensured.
Description
Technical Field
The utility model relates to a switchable MVR and multi-effect dual-purpose evaporator, and belongs to the technical field of chemical equipment.
Background
The evaporator is a common unit operation in chemical industry, and the currently widely used evaporation process comprises MVR evaporation and multi-effect evaporation.
MVR evaporation is an energy-saving process in which secondary vapor evaporated is mechanically recovered and recompressed by a vapor compressor and then reused in the form of a heat source.
The multi-effect evaporation is a series combination of multiple-stage evaporators, the evaporation pressure of each stage is reduced in sequence, the primary evaporator consumes the generated steam as a heat source, and the secondary steam evaporated by the front-stage evaporator is used as a heat source for the rear stage to use the traditional energy-saving process.
The defects of the prior art are as follows:
(1) Because the two evaporation processes have different steam utilization modes, the two evaporation processes are relatively independent evaporation operation processes, and only one of the two evaporation processes can be selected for the type selection design at the beginning of the design of the evaporator.
(2) MVR evaporators are the currently mainstream option because they are more energy efficient than multi-effect evaporation, but because they require a mating vapor compressor, which is a relatively large-sized mobile device, once the device fails, the entire evaporation system is shut down, and there are no alternatives, and longer maintenance times bring many inconveniences to production.
(3) The multi-effect evaporation system has the advantages that although the energy-saving effect is not as good as that of an MVR evaporation system, a steam compressor is not needed, the principle of evaporator single equipment is consistent with that of MVR evaporator main equipment, if two processes can be fused, when the compressor of the MVR evaporation system is stopped due to fault, and the compressor needs to be maintained for a long time, the multi-effect evaporation system can be switched into a multi-effect operation mode, so that the continuity of production can be ensured.
The market has the evaporator form of combination of MVR and multiple-effect principle, but the evaporator is mainly used for solving a specific process problem, and strictly belongs to the field of MVR evaporation systems, and can only be used singly, and the compressor cannot be switched to a multiple-effect evaporation mode to continue to operate after failure.
Disclosure of Invention
The utility model aims to provide a switchable MVR and multi-effect dual-purpose evaporator, which can be switched between the MVR evaporator and the multi-effect evaporator according to the use requirement.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
a switchable MVR and multi-effect dual-purpose evaporator comprises evaporator main body equipment, a plurality of condensate tanks and a plurality of pumps, wherein the evaporator main body equipment, the condensate tanks and the pumps are required by an MVR evaporation system and a multi-effect evaporation system; the system is also provided with a compressor required by the MVR evaporation system, a condenser and a vacuum pump required by the multi-effect evaporation system;
the evaporator main body equipment of each stage comprises a heater and a separator, the steam inlet of the heater of the first stage is communicated with a raw steam pipeline, and the steam inlet of the heater of each stage is communicated with the steam outlet of the compressor through a pipeline provided with a control valve; the steam outlet of the separator of each stage is communicated with the steam inlet of the compressor through a pipeline provided with a control valve; the steam outlet of the separator of the upper stage is also communicated with the steam inlet of the heater of the lower stage through a pipeline provided with a control valve; the steam outlet of the separator of the last stage is also communicated with the condenser through a pipeline provided with a control valve;
the separators of each stage are also in communication via a gas line with a regulating valve and finally with a condenser.
The further improvement is as follows: the non-condensable gas outlet of the condenser is also communicated with a vacuum pump;
the further improvement is as follows: the heater of the first stage is also communicated with the raw steam condensate water tank.
The further improvement is as follows: the control valve is an 8-shaped blind plate.
The further improvement is as follows: the heater and the separator are main equipment of a certain level of evaporator; when operating in MVR system mode, the vapor side of each evaporator is connected in parallel to the compressor; when the multi-effect system mode is operated, the steam sides of the evaporators at all levels are connected in series, and the condenser and the vacuum pump are started at the same time; the two modes are switched by adjusting the corresponding 8-shaped blind plates to change the flow of the secondary steam side.
The further improvement is as follows: when the device is used as an MVR system, evaporators at all levels are in a parallel state, secondary steam generated by a separator to which the evaporators belong is subjected to work, temperature rise and pressure rise through a compressor, and the secondary steam is taken as a main heat source for system evaporation and enters into heaters at all levels to release heat at the same time, and after being condensed into condensed water, the condensed water flows into a condensed water tank uniformly;
when the equipment is used as a normal pressure evaporator, noncondensable gas in the equipment enters a condenser through a regulating valve to be condensed, and then is discharged through an emptying port;
when the device is used as a negative pressure evaporator, a vacuum pump is started, the evaporation pressure of the system is reduced by adjusting the opening of a valve, and meanwhile, non-condensable gas in the system is discharged;
when the equipment is used as a multi-effect system, evaporators at all stages are in a serial state, and secondary steam generated by each evaporator enters the evaporator at the next stage as a heat source; heating the evaporator of the first stage by using raw steam, and enabling the generated raw steam condensate water to enter a raw steam condensate water tank for discharging; the secondary steam generated by the separator of the upper stage enters the heater of the lower stage for heating; condensed water after secondary steam condensation enters a next-stage heater for flash evaporation and heat release and then enters a condensed water tank, and condensed water in a final-stage heater directly enters the condensed water tank for external discharge; the evaporation pressure of the system is reduced by starting the vacuum pump; by changing the opening of the regulating valve, the non-condensable gas in the system is discharged.
The further improvement is as follows: the evaporator is provided with two or three or four stages, or more than four stages.
By adopting the technical scheme, the utility model has the following technical effects:
the device of the utility model can be used as an MVR system under normal conditions, thereby reducing the consumption of the generated steam and having lower operation cost.
When the compressor is in fault and needs to be overhauled for a long time, the equipment is switched into multi-effect use, so that the operation of a system can be ensured, and the production continuity is ensured.
The device can be switched between the MVR evaporator and the multi-effect evaporator, has the advantages of the two evaporators, and solves the problems existing in the use of the two evaporators. The MVR evaporator and the multi-effect evaporator of the device are arranged at the same time, and some devices which can be shared can be arranged in one set, so that the purchase cost of the devices is reduced.
The device provided by the utility model utilizes the arrangement of the pipeline and is matched with the opening and closing control of various regulating valves and control valves, so that the switching between the MVR evaporator and the multi-effect evaporator is smooth and easy, and the optimal selection of the MVR evaporator and the multi-effect evaporator is realized according to the needs in actual use.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present utility model;
FIG. 2 is a flow chart of the present utility model in use as an MVR system;
FIG. 3 is a flow chart of the present utility model in use as a multiple effect evaporator system;
wherein, a first-stage heater, b, a first-stage separator, c, a second-stage heater, d, a second-stage separator, e, a third-stage heater, f, a third-stage separator, g, a condenser, h, a vacuum pump, i, a raw steam condensate water tank, j, a raw steam condensate water pump, k, a primary circulating pump, l, a secondary circulating pump, m, a tertiary circulating pump, n, a condensate water tank, o and a condensate water pump;
1. a valve I, a 2, an 8-word blind plate II, a 3, an 8-word blind plate III, a 4, an 8-word blind plate IV, a 5, an 8-word blind plate V, a 6, an 8-word blind plate VI, a 7, an 8-word blind plate seven, an 8-word blind plate eight, a 9, an 8-word blind plate nine, a 10, an 8-word blind plate ten, a 11, a valve II, a 12, a valve III, a 13, a valve IV, a 14, a valve V, a 15, a valve VI, a 16, a valve seven, a 17 and a valve eight;
description of the embodiments
The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.
The utility model relates to a switchable MVR and multi-effect dual-purpose evaporator which is applied to chemical production and is mainly used for evaporating and treating salt-containing wastewater.
The utility model relates to a switchable MVR and multi-effect dual-purpose evaporator, which comprises evaporator main body equipment, a plurality of condensate tanks and a plurality of pumps, wherein the evaporator main body equipment, the condensate tanks and the pumps are all needed by an MVR evaporation system and a multi-effect evaporation system; the device is also provided with a compressor required by the MVR evaporation system, a condenser and a vacuum pump required by the multi-effect evaporation system. The evaporator main body equipment mainly comprises a heater and a separator which are communicated, and a circulating pump and a discharging pump which are matched with each other. In the working process, the evaporator can be switched to be used as an MVR evaporator or a multi-effect evaporator according to the requirement.
The apparatus may be provided with a plurality of stages of evaporators as required, the evaporator body apparatus of each stage including a heater and a separator. The communication between the evaporators of all stages is provided with the communication between material pipelines and the communication between steam pipelines.
The communication of the material pipelines selects modes of forward flow, reverse flow and the like according to different material properties.
The communication condition of the steam pipeline is as follows: the steam inlet of the heater of each stage is communicated with the steam outlet of the compressor through a pipeline provided with a control valve. And a steam inlet pipeline of the primary heater is connected with a raw steam pipeline.
The steam outlet of the separator of each stage is communicated with the steam inlet of the compressor through a pipeline provided with a control valve.
The steam outlet of each separator at the upper stage is also in communication with the steam inlet of the heater at the lower stage via a conduit provided with a control valve. In connection with fig. 1, a communicating pipe is provided between the branch pipe of the steam outlet of the upper stage separator and the branch pipe of the steam inlet of the lower stage heater, and a control valve is provided on this communicating pipe. The above control valves are of the same type, for example, an 8-letter blind plate may be selected.
The steam outlet of the separator of the last stage is also communicated with the condenser through a pipeline provided with a control valve.
The separators of each stage are also communicated with a gas pipeline with a regulating valve and finally are communicated with a condenser g, the condenser is further communicated with a vacuum pump h, and non-condensable gas in the system can be discharged through the regulation control of the regulating valve.
Further, the steam outlet of the condenser g is also communicated with a vacuum pump; the condenser g is also communicated with a circulating water return pipeline and a circulating water supply pipeline.
In a specific implementation, the device is further provided with a condensate water tank, and the condenser g and the heater of each stage are communicated with the condensate water tank n. Condensed water generated by the condenser g and the heater of each stage is recovered by entering the condensed water tank n.
In a specific implementation, the device is further provided with a raw steam condensate water tank i, the heater of the first stage is also communicated with the raw steam condensate water tank i, and condensate water generated by raw steam enters the raw steam condensate water tank i.
The device can switch the working mode by controlling the opening and closing of the control valve. When the device is operated in MVR system mode, the vapor side of each stage of evaporator is connected in parallel to the compressor; the condenser and the vacuum pump are in standby state. As particularly shown in fig. 2.
When the apparatus is operated in a multi-effect system mode, the vapor side of each stage of evaporator is in series while the condenser and vacuum pump are activated; the two modes are switched by adjusting the corresponding 8-shaped blind plates to change the flow of the secondary steam side. As particularly shown in fig. 3. The evaporators at all levels are in a parallel state, secondary steam generated by a separator to which the evaporators belong is subjected to work, temperature rise and pressure rise through a compressor, and enters the corresponding heater as a main heat source for system evaporation to release heat at the same time, and after being condensed into condensed water, the condensed water flows into a condensed water tank uniformly;
when the equipment is used as a multi-effect system, the evaporators at all stages are in a serial state, and secondary steam generated by each stage of evaporator enters the next stage of evaporator as a heat source; heating the evaporator of the first stage by using raw steam, and enabling the generated raw steam condensate water to enter a raw steam condensate water tank for discharging; the secondary steam generated by the separator of the upper stage enters the heater of the lower stage for heating; condensed water after secondary steam condensation enters a next-stage heater for flash evaporation and heat release and then enters a condensed water tank, and condensed water in a final-stage heater directly enters the condensed water tank for external discharge; the evaporation pressure of the system is reduced by starting the vacuum pump; by changing the opening of the regulating valve, the non-condensable gas in the system is discharged.
When the equipment is used as an atmospheric evaporator, noncondensable gas in the equipment enters the condenser to be condensed through the regulating valve, and is discharged through the emptying port.
When the device is used as a negative pressure evaporator, the vacuum pump is started, the evaporation pressure of the system is reduced by adjusting the opening of the valve, and meanwhile, non-condensable gas in the system is discharged.
The plant evaporator may be provided with two or three or four stages, or more stages greater than four stages, as desired.
Examples
The following is a specific example, which is described by taking a three-stage evaporator as an example.
As shown in fig. 1, 2 and 3. The apparatus is provided with three stages of evaporators, the evaporator body apparatus of each stage comprising a heater and a separator, referred to as a primary heater a, a primary separator b, a secondary heater c, a secondary separator d, a tertiary heater e and a tertiary separator f, respectively. The communication between adjacent evaporators is provided with the communication between material pipelines and the communication between steam pipelines.
In combination with fig. 1. The communication condition of the steam pipeline is as follows: the steam inlet of the primary heater a is communicated with a raw steam pipeline. The steam outlet of the compressor is communicated with a main pipeline, the steam inlet of the primary heater a is communicated with the main pipeline of the steam outlet of the compressor through a branch pipeline, and an 8-shaped blind plate ten 10 is arranged on the branch pipeline. The steam inlet of the secondary heater c is communicated with the main pipeline of the steam outlet of the compressor through a branch pipeline, and an 8-shaped blind plate four 4 is arranged on the branch pipeline. The steam inlet of the three-stage heater e is communicated with the main pipeline of the steam outlet of the compressor through a branch pipeline, and an 8-shaped blind plate seven 7 is arranged on the branch pipeline.
The steam inlet of the compressor is also communicated with a main pipeline, the steam outlets of the primary separator b, the secondary separator d and the tertiary separator f are communicated with the main pipeline of the steam inlet of the compressor through branch pipelines, and the branch pipelines corresponding to the primary separator b, the secondary separator d and the tertiary separator f are respectively provided with a second 8-word blind plate 2, a fifth 8-word blind plate 5 and an eighth 8-word blind plate 8.
The steam outlet of the three-stage separator f is also communicated with the condenser through a pipeline provided with an 8-shaped blind plate nine 9, and the steam in the three-stage separator f enters the condenser to be condensed into liquid water.
The primary separator b, the secondary separator d and the tertiary separator f are also communicated with a gas pipeline with a regulating valve, and finally are communicated with a condenser g, the condenser is further communicated with a vacuum pump h, and noncondensable gas in the system can be discharged through the regulation control of the regulating valve. A valve II 11 is arranged on a pipeline between the primary separator b and the secondary separator d, and a valve III 12 is arranged on a pipeline between the secondary separator d and the tertiary separator f. A valve IV 13 is arranged on the pipeline between the three-stage separator f and the condenser g. The steam outlet of the condenser g is also in communication with a vacuum pump.
The above is the communication condition of the steam pipeline.
The condenser g is also communicated with a circulating water return pipeline and a circulating water supply pipeline.
The device is also provided with a condensate water tank n, and a condenser g, a primary heater a, a secondary heater c and a tertiary heater e are communicated with the condensate water tank n through pipelines. Condensed water generated by the condenser g, the primary heater a, the secondary heater c and the tertiary heater e enters the condensed water tank n to be recovered.
The device is also provided with a raw steam condensate water tank i, the primary heater a is also communicated with the raw steam condensate water tank i, and condensate water generated by raw steam enters the raw steam condensate water tank i. A valve five 14 is arranged on a pipeline of the primary heater a communicated with the raw steam condensate water tank i, and a valve six 15 is arranged on a pipeline of the primary heater a communicated with the condensate water tank i.
The flow direction of the materials in fig. 2 and 3 can be parallel flow, counter flow or other modes flexibly due to different material properties, and the flow direction is not shown in detail in the above drawings. In fig. 2 and 3, the thick solid line at the upper part of the heater is the flow direction of steam, and the thick solid line at the lower part of the heater is the flow direction of condensed water.
The primary heater a and the primary separator b are collectively referred to as a primary evaporator. The secondary heater c and the secondary separator d are collectively referred to as a secondary evaporator. The three-stage heater e and the three-stage separator f are collectively referred to as a three-stage evaporator.
A primary heater a, a secondary heater c, a tertiary heater e and a third heater. Primary separator b, secondary separator d, and tertiary separator f
1. When the device is used as an MVR system, the flow of steam and condensed water is shown in the thick line of FIG. 2: the second 8-word blind plate 2, the fourth 8-word blind plate 4, the fifth 8-word blind plate 5, the seventh 8-word blind plate 7, the eighth 8-word blind plate 8 and the tenth 10-word blind plate are in an on state, and the other are in an off state. At this time, the primary evaporator, the secondary evaporator and the tertiary evaporator are in a parallel state, secondary steam generated by the primary separator b, the secondary separator d and the tertiary separator f is acted by a compressor, heated and boosted and used as a main heat source for system evaporation, and enters the primary heater a, the secondary heater c and the tertiary heater e to release heat, and after being condensed into condensed water, the condensed water uniformly flows into the condensed water tank n (the valve five 14 and the valve seven 16 are in a closed state, and the valve six 15 and the valve eight 17 are in a full-open state). At this time, only a small amount of raw steam is required to enter the system as a supplemental heat source to maintain the system operating temperature.
2. When the device is used as an atmospheric evaporator, noncondensable gas in the system enters the condenser to be condensed through a valve II 11, a valve III 12 and a valve IV 13, and then is discharged through an emptying port to be treated. When the device is used as a negative pressure evaporator, a vacuum pump can be started, the evaporation pressure of the system is reduced through adjusting the opening of the valve II 11, the valve III 12 and the valve IV 13, and meanwhile, noncondensable gas in the system is discharged.
3. When the apparatus is used as a triple effect evaporation system, the steam and condensate flow is as shown in figure 3 in bold: the third 8-shaped blind plate 3, the sixth 8-shaped blind plate 6 and the ninth 8-shaped blind plate 9 are in an on state, and the other blind plates are in an off state. The first-stage evaporator, the second-stage evaporator and the third-stage evaporator are in a serial state. At this time, the secondary steam generated in each stage enters the evaporator of the next stage and serves as a heat source of the evaporator of the next stage. The primary heater a is heated by utilizing the raw steam, and the generated raw steam condensate water enters a raw steam condensate water tank for discharging. Valve five 14 is in an open state and valve six 15 is in a closed state. The secondary steam generated in the chamber of the primary separator b enters the secondary heater c to heat the secondary heater c, condensed water enters the tertiary heater f to flash and release heat and then enters the condensed water tank, the valve seven 16 is in an open state, and the valve eight 17 is in a closed state. The secondary steam generated by the secondary separator d enters the tertiary heater e to heat the tertiary heater e, and condensed water after condensation enters the condensed water tank n to be discharged. By turning on the vacuum pump h, the evaporation pressure of the system is reduced. And the non-condensable gas in the system is discharged by adjusting the opening degree of the valve II 11, the valve III 12 and the valve IV 13.
According to measurement and calculation, in the 15t/h wastewater treatment project, under normal conditions, an MVR system is used, the comprehensive power consumption for treating one ton of water is 48 kW.h, and the steam consumption is 0.08 ton. The raw steam price is about 350 yuan/ton, the comprehensive treatment cost is 76 yuan/ton, and compared with the 150 yuan/ton treatment cost of a three-effect system, the operation cost can be greatly reduced.
When the amount of the raw material liquid is less than 10 tons/hour, the compressor cannot be operated normally. If the compressor is frequently started and stopped, great difficulty is caused to an operator, and a fault is easily caused. Under the working condition, the device is switched into a three-effect system for use, and the evaporation capacity of the system is reduced by controlling and reducing the steam generation amount, so that the stable operation of the system is maintained.
When the compressor is in fault maintenance, the compressor can be switched to be used by a three-effect system, so that production is ensured.
The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (8)
1. A switchable MVR and multiple effect dual purpose evaporator characterized by: the evaporator comprises evaporator main body equipment, a plurality of condensate water tanks and a plurality of pumps which are required by an MVR evaporation system and a multi-effect evaporation system; the system is also provided with a compressor required by the MVR evaporation system, a condenser and a vacuum pump required by the multi-effect evaporation system;
the evaporator main body equipment of each stage comprises a heater and a separator, the steam inlet of the heater of the first stage is communicated with a raw steam pipeline, and the steam inlet of the heater of each stage is communicated with the steam outlet of the compressor through a pipeline provided with a control valve; the steam outlet of the separator of each stage is communicated with the steam inlet of the compressor through a pipeline provided with a control valve; the steam outlet of the separator of the upper stage is also communicated with the steam inlet of the heater of the lower stage through a pipeline provided with a control valve; the steam outlet of the separator of the last stage is also communicated with the condenser through a pipeline provided with a control valve;
the separators of each stage are also in communication via a gas line with a regulating valve and finally with a condenser.
2. A switchable MVR and multiple effect dual purpose evaporator according to claim 1 wherein: the steam outlet of the condenser is also communicated with a vacuum pump; the condenser is also communicated with a circulating water return pipeline and a circulating water supply pipeline.
3. A switchable MVR and multiple effect dual purpose evaporator according to claim 2 wherein: the condenser is also provided with a condensed water tank, and the heater of each stage is communicated with the condensed water tank.
4. A switchable MVR and multiple effect dual purpose evaporator according to claim 3 wherein: the heater of the first stage is also communicated with the raw steam condensate water tank.
5. A switchable MVR and multiple effect dual purpose evaporator according to any of claims 1 to 4 wherein: the control valve is an 8-shaped blind plate.
6. A switchable MVR and multiple effect dual purpose evaporator according to claim 5 wherein: the heater and the separator are main equipment of a certain level of evaporator; when operating in MVR system mode, the vapor side of each evaporator is connected in parallel to the compressor; when the multi-effect system mode is operated, the steam sides of the evaporators at all levels are connected in series, and a vacuum pump is started at the same time; the two modes are switched by adjusting the corresponding 8-shaped blind plates to change the flow of the secondary steam side.
7. A switchable MVR and multiple effect dual purpose evaporator according to claim 6 wherein: when the device is used as an MVR system, evaporators at all levels are in a parallel state, secondary steam generated by a separator to which the evaporators belong is subjected to work, temperature rise and pressure rise through a compressor, and the secondary steam is taken as a main heat source for system evaporation and enters into heaters at all levels to release heat at the same time, and after being condensed into condensed water, the condensed water flows into a condensed water tank uniformly;
when the equipment is used as a normal pressure evaporator, noncondensable gas in the equipment enters a condenser to be condensed through an adjusting valve, and is discharged through an emptying port;
when the device is used as a negative pressure evaporator, a vacuum pump is started, the evaporation pressure of the system is reduced by adjusting the opening of a valve, and meanwhile, non-condensable gas in the system is discharged;
when the equipment is used as a multi-effect system, evaporators at all stages are in a serial state, and secondary steam generated by each evaporator enters the evaporator at the next stage as a heat source; heating the evaporator of the first stage by using raw steam, and enabling the generated raw steam condensate water to enter a raw steam condensate water tank for discharging; the secondary steam generated by the separator of the upper stage enters the heater of the lower stage for heating; condensed water after secondary steam condensation enters a next-stage heater for flash evaporation and heat release and then enters a condensed water tank, and condensed water in a final-stage heater directly enters the condensed water tank for external discharge; the evaporation pressure of the system is reduced by starting the vacuum pump; by changing the opening of the regulating valve, the non-condensable gas in the system is discharged.
8. A switchable MVR and multiple effect dual purpose evaporator according to any of claims 1 to 4 wherein: the evaporator is provided with two or three or four stages, or more than four stages.
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| CN202321795861.4U CN220530690U (en) | 2023-07-10 | 2023-07-10 | Switchable MVR and multi-effect dual-purpose evaporator |
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| CN202321795861.4U CN220530690U (en) | 2023-07-10 | 2023-07-10 | Switchable MVR and multi-effect dual-purpose evaporator |
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