CN213698869U - Non-uniform multi-effect flash evaporation device - Google Patents
Non-uniform multi-effect flash evaporation device Download PDFInfo
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- CN213698869U CN213698869U CN202022027491.2U CN202022027491U CN213698869U CN 213698869 U CN213698869 U CN 213698869U CN 202022027491 U CN202022027491 U CN 202022027491U CN 213698869 U CN213698869 U CN 213698869U
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Abstract
Inhomogeneous multiple-effect flash distillation plant, including the flash vessel, the flash vessel includes the cavity of multistage efficiency, from the top down is first effect to the Nth in proper order, high temperature sewage passes through the first effect that inlet channel got into the flash vessel, sewage is first in proper order imitated to the Nth, imitate the back through water drainage pipe after the Nth at last and discharge, be equipped with intake pump and water-withdrawal pump on inlet channel and the water drainage pipe respectively, the first top of imitating the cavity that corresponds to the Nth all is equipped with the flash distillation true gas export, the first effect highly is the same proportion increase to the Nth effect cavity. According to the actual use requirement, a non-uniform multi-effect flash evaporation device is designed. According to the condition that each effect pressure reduces, the height between each effect is designed, the time that the flash steam stays in the pipe body is guaranteed, accidents such as equipment blockage caused by the fact that the steam stays for too short time and sewage are carried are prevented, and the reliability of the equipment is guaranteed.
Description
Technical Field
The utility model relates to a flash vessel technical field, in particular to inhomogeneous multiple-effect flash distillation plant.
Background
At present, low-temperature industrial wastewater exists in various fields such as steel, chemical industry, printing and dyeing, coking and the like, and contains huge low-temperature heat sources. These industrial wastewaters are complex in composition and if directly heated by a heat exchanger, corrosion, wear and scaling can seriously affect the reliability and life of the equipment. Therefore, the problem can be effectively solved by adopting multi-stage flash evaporation.
In order to simplify the design, the thermal power of each effect design of the multi-effect flash evaporation device which runs on the market at present is basically the same (flash evaporation steam mass flow), and the heights of the effects are the same.
As the pressure of each effect is gradually reduced, the steam density is also reduced. As the effect number increases, the volume flow of each effect of flash steam gradually increases, and the steam flow rate also increases along with the effect number. Practice operation shows that the retention time of flash steam in a tank body is too short in some equipment, so that accidents such as equipment blockage caused by sewage in steam are caused, and the reliability of the equipment is seriously influenced.
In view of the above, the invention of a non-uniform multi-effect flash evaporation device is urgently needed.
SUMMERY OF THE UTILITY MODEL
For overcoming the problem that exists among the prior art, the utility model provides a non-uniform multiple-effect flash distillation device.
The utility model provides a technical scheme that its technical problem adopted is: this kind of inhomogeneous multiple-effect flash distillation device, including the flash vessel, the flash vessel includes the cavity of multistage efficiency, from the top down is first to imitate to the Nth in proper order, high temperature sewage passes through the first effect that inlet channel got into the flash vessel, sewage is first to imitate to the Nth in proper order, imitates the back through water drainage pipe at last through the Nth and discharges, be equipped with intake pump and water-withdrawal pump respectively on inlet channel and the water drainage pipe, the first top of imitating the cavity that corresponds to the Nth all is equipped with the export of flash distillation true gas, the first effect highly is the same proportion increase to the Nth effect cavity.
Further, the flash evaporator comprises a chamber with at least three stages of efficiency.
Further, the number of effects of the flash evaporator, the temperature and the pressure of each effect are determined according to the components and the temperature of the industrial wastewater.
Further onDetermining the amount of flash steam G based on the heat balance of each effectGAnd outlet sewage flow GW。
Further, when the pressure is the lowest efficiency, namely the Nth effect, the flow velocity V of the flash steam is determined according to the parameters and the flow of the flash steam, and the flow velocity V is less than 3 m/s.
Further, the diameter D of the multi-effect flash evaporator is determined according to the steam flow and the flow speed of the Nth effect.
Further, the flash steam residence time T for each effect is determinedGWith liquid residence time TW。
Further, the residence time T of the liquid according to each effectWWith steam residence time TGThe flow velocity V of the steam, and the height L of the steam space of each effectGAnd the operating liquid level LW(ii) a Height L ═ L of each effectW+LG。
To sum up, the utility model discloses an above-mentioned technical scheme's beneficial effect as follows:
according to the actual use requirement, a non-uniform multi-effect flash evaporation device is designed. According to the condition that each effect pressure reduces, the height between each effect is designed, the time that the flash steam stays in the pipe body is guaranteed, accidents such as equipment blockage caused by the fact that the steam stays for too short time and sewage are carried are prevented, and the reliability of the equipment is guaranteed.
Drawings
Fig. 1 is a structural view of the present invention.
In the figure:
1 first effect, 2 second effects, 3 third effects, 4 fourth effects, 5 fifth effects, 6 first effect flash steam outlet, 7 second effect flash steam outlet, 8 third effect flash steam outlet, 9 fourth effect flash steam outlet, 10 fifth effect flash steam outlet.
Detailed Description
The features and principles of the present invention will be described in detail below with reference to the accompanying drawings, and the illustrated embodiments are only for explaining the present invention, and do not limit the scope of the present invention.
The non-uniform multi-effect flash evaporation device comprises a flash evaporator, wherein the flash evaporator comprises a chamber with multi-stage effects, the first effect to the Nth effect are sequentially from top to bottom, the effect is generally 3 to 7, and specific effect data are set according to actual requirements. The high-temperature sewage enters the first effect of the flash evaporator through the water inlet pipeline, sequentially passes through the first effect to the Nth effect, and is finally discharged through the drainage pipeline after the Nth effect. The water inlet pipeline and the water discharge pipeline are respectively provided with a water inlet pump and a water return pump, the tops of the first to N-th effective cavities are respectively provided with a flash evaporation vacuum outlet, and the heights of the first to N-th effective cavities are increased in the same proportion.
The high-temperature sewage firstly enters a first-stage closed space (first effect for short) in a negative pressure state from the upper part of the multi-effect flash evaporation device, and the negative pressure is formed by an external vacuum pump. In the first effect, as shown in fig. 1, there is a water space and a steam space. During operation, the water space is kept at a reasonable water level, and the steam space of the first effect and the second effect is isolated. Under the action of an external vacuum pump, under a certain proper vacuum/pressure, the high-temperature sewage in the first effect reaches a saturated state, and after a part of water vapor evaporated from the sewage in the first effect water space flows out from a first effect flash evaporation steam outlet, heat energy and working medium recovery are carried out outside the multi-effect flash evaporation device.
The residual high-temperature sewage in the first effect water space flows into a second effect of the multi-effect flash evaporation device under the action of gravity, and the principle of the second effect is the same as that of the first effect. The main difference is that the second effect has a lower saturation temperature and saturation pressure than the first effect, and thus the temperature of the steam exiting the flash steam outlet from the second effect is also lower than the first effect.
The effect number of the multi-effect flash evaporation device depends on the actual industrial situation, and the total effect number is generally between three and seven (not limited to). From the first effect to the last effect, the steam pressure and temperature gradually decrease.
Design Specification design of gas-liquid separator HG/T20570.8-95
1. Determining a design boundary: determining the effect number, the temperature and the pressure of each effect according to the components and the temperature of the industrial wastewater.
2. Determining the flash steam amount G according to the heat balance of each effectGAnd outlet sewage flow GW。
3. At the lowest efficiency of pressure, the flash steam flow rate V (typically less than 3m/s) is determined according to design specifications based on flash steam parameters and flow.
4. And determining the diameter D of the multi-effect flash evaporation device according to the steam flow and the flow speed of the lowest pressure effect.
5. Determining flash steam residence time T of each effect according to design specifications and site space positionGWith liquid residence time TWThe range is generally TG1-4 seconds (not limited), TWThe time is 10s to 3min (not limited).
6. Residence time of liquid T according to each effectWWith steam residence time TGThe steam flow velocity V determines the steam space height L of each effectGAnd the operating liquid level LW。
7. Height L ═ L of each effectW+LG；
The implementation case is as follows:
the temperature of the slag flushing water of a certain steel mill is 70 ℃, and the flow is 216 t/h. The multi-effect flash evaporation device is supposed to be adopted to recover the waste heat of the slag flushing water to supply heat for nearby residents. The heating backwater temperature is 45 ℃, and the water supply temperature is 65 ℃.
According to the design principle, the method comprises the following specific steps:
1. designing a boundary:
2. determining the effective number: the total effect number is 5 according to the temperature reduction of 4 ℃ in each effect; namely, the flash evaporator comprises a first effect 1, a second effect 2, a third effect 3, a fourth effect 4 and a fifth effect 5 from top to bottom in sequence; the top of the chamber corresponding to the first effect to the fifth effect is respectively provided with a first effect flash steam outlet 6, a second effect flash steam outlet 7, a third effect flash steam outlet 8, a fourth effect flash steam outlet 9 and a fifth effect flash steam outlet 10.
3. Determining the flash evaporation amount of each effect according to the heat balance:
4. determining the diameter of the non-uniform multistage flash evaporation device according to the fifth effect
5. Determining the height of each effect steam space
6. Height of water space per effect
7. Altitude determination per effect
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, which is defined by the appended claims.
Claims (8)
1. Inhomogeneous multiple-effect flash distillation plant, including the flash vessel, its characterized in that, the flash vessel includes the cavity of multistage efficiency, from the top down is first effect to the Nth in proper order and imitates, high temperature sewage passes through the first effect that inlet channel got into the flash vessel, sewage is first imitated to the Nth in proper order, and the last drainage pipe way that passes through after the Nth imitates discharges, is equipped with intake pump and water-withdrawal pump on inlet channel and the drainage pipe respectively, and the first top of imitating the cavity that corresponds to the Nth all is equipped with the flash distillation true gas export, and the first effect highly is the same proportion increase to the Nth effect cavity.
2. The non-uniform multi-effect flash apparatus of claim 1, wherein the flash vessel comprises a chamber of at least three stages of effectiveness.
3. The non-uniform multi-effect flash apparatus of claim 1, wherein the number of effects of the flash evaporator, the temperature and the pressure of each effect are determined according to the composition and the temperature of the industrial wastewater.
4. The non-uniform multi-effect flash apparatus of claim 3, wherein the flash steam amount G is determined according to the heat balance of each effectGAnd outlet sewage flow GW。
5. The non-uniform multi-effect flash apparatus of claim 4, wherein at the pressure least efficient, i.e. nth effect, the flash steam flow rate V is determined based on the flash steam parameters and flow rate, and is less than 3 m/s.
6. The non-uniform multi-effect flash apparatus of claim 5, wherein the diameter D of the multi-effect flash vessel is determined according to the steam flow rate of the Nth effect.
7. The non-uniform multi-effect flash apparatus of claim 6, wherein flash steam residence time T is determined for each effectGWith liquid residence time TW。
8. The non-uniform multi-effect flash apparatus of claim 7, wherein the liquid residence time T per effect is a function ofWWith steam residence time TGThe flow velocity V of the steam, and the height L of the steam space of each effectGAnd the operating liquid level LW(ii) a Height L ═ L of each effectW+LG。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022027491.2U CN213698869U (en) | 2020-09-16 | 2020-09-16 | Non-uniform multi-effect flash evaporation device |
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| CN202022027491.2U CN213698869U (en) | 2020-09-16 | 2020-09-16 | Non-uniform multi-effect flash evaporation device |
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