CN115430161A - Novel energy-driven thermal cycle type evaporation unit - Google Patents

Abstract

The invention relates to the technical field of evaporation units, and discloses a novel energy-driven thermal circulation type evaporation unit which comprises a material evaporation system and a heat pump system, wherein the material evaporation system comprises a feed pump and a vacuum pump, the input end of the feed pump is fixedly connected with a preheater through a pipeline, the output end of the feed pump is fixedly provided with an evaporator through a pipeline, the output end of the evaporator is fixedly provided with a separator through a pipeline, the output end of the separator is fixedly provided with a condenser through a pipeline, and the output end of the condenser is fixedly provided with a liquid receiving tank; the heat pump system comprises a compressor, wherein the input end of the compressor is fixedly connected with a condenser through a pipeline, and the output end of the compressor is fixedly connected with a heater through a pipeline. In the invention, the same equipment is suitable for the evaporation of aqueous solution and organic solvent, thereby having the effect of safe operation; using clean energy; the heat energy is converted and recycled between evaporation and condensation; the heating medium and the cooling medium are the same medium, and boiler steam and cooling water are not needed.

Description

Novel energy-driven thermal cycle type evaporation unit

Technical Field

The invention relates to the technical field of evaporation units, in particular to a novel energy-driven thermal circulation type evaporation unit.

Background

At present, single-effect, double-effect and triple-effect evaporators are widely adopted by evaporation equipment in various industries, a heat medium is boiler steam, a refrigerant medium is cooling water, and heat energy of the heat medium is finally transferred to a refrigerant to be released, so that the heat energy consumption is large. Although the two-effect, three-effect or multi-effect evaporator can save part of the heat energy, the terminal heat energy is released and wasted. The front-end equipment of the evaporator needs a boiler, the rear-end equipment needs a cooling tower, and waste gas and waste water discharged by the boiler and the cooling tower in the running process cause environmental pollution and increase the environmental protection cost.

Nowadays, energy-saving evaporation equipment has MVR evaporimeter and TVR evaporimeter, and the MVR evaporimeter principle is: the secondary steam generated by evaporating the material is compressed by a steam compressor, the temperature and the pressure are improved, the enthalpy value is increased, the compressed secondary steam is used as a heat source to heat the evaporating material liquid, the latent heat of the secondary steam is fully utilized, and the purpose of saving energy is achieved. The principle of the TVR evaporator is: and (3) sucking part of secondary steam into the high-temperature and high-pressure boiler steam through a steam jet pump for mixing, and using the mixed steam as a heat source to heat the evaporation material. The two evaporators have the advantage of energy conservation, and particularly the MVR has a good energy-saving effect. But also has some drawbacks: 1. both evaporators are vapor compressors or jet pumps designed and selected by taking saturated water vapor as a medium, and the compression ratios of the water vapor and the organic solvent gas are different, so that the selected vapor compressor cannot be simultaneously applied to the compression of the organic solvent gas. 2. The organic solvent gas is flammable and explosive, and potential safety hazards exist when the organic solvent gas is compressed by a compressor rotating at a high speed. Therefore, at present, the MVR and TVR evaporators are only used for evaporating and concentrating the aqueous solution in the industry, and the traditional single-effect evaporator is also used for evaporating and concentrating the organic solvent.

Therefore, a novel energy-driven thermal circulation type evaporation unit is provided.

Disclosure of Invention

The invention mainly solves the technical problems in the prior art and provides a novel energy-driven thermal circulation type evaporation unit.

In order to achieve the purpose, the invention adopts the following technical scheme that the novel energy-driven thermal circulation type evaporation unit comprises a material evaporation system and a heat pump system, wherein the material evaporation system comprises a feed pump and a vacuum pump, the input end of the feed pump is fixedly connected with a preheater through a pipeline, the output end of the feed pump is fixedly provided with an evaporator through a pipeline, the output end of the evaporator is fixedly provided with a separator through a pipeline, the output end of the separator is fixedly provided with a condenser through a pipeline, and the output end of the condenser is fixedly provided with a liquid receiving tank;

the heat pump system comprises a compressor, wherein the input end of the compressor is fixedly connected with a condenser through a pipeline, and the output end of the compressor is fixedly connected with a heater through a pipeline.

Preferably, the condenser is a threaded pipe type condenser, the separator and the liquid receiving tank are respectively and fixedly connected with the input end and the output end of a material condensing pipe of the condenser, and the compressor is fixedly connected with the input end and the output end of a condensing pipe of the condenser.

Preferably, a cooling liquid tank is fixedly mounted at an input end of the heater, and cooling liquid is stored in the cooling liquid tank.

Preferably, the input end of the vacuum pump is fixedly connected with the heater and the condenser respectively.

Preferably, brackets are fixedly mounted on the outer wall surfaces of the evaporator, the heater and the condenser.

Preferably, a control panel is fixedly mounted on the front end face of the support and electrically connected with the feeding pump, the compressor and the vacuum pump.

Advantageous effects

The invention provides a novel energy-driven thermal circulation type evaporation unit. The method has the following beneficial effects:

(1) The novel energy-driven thermal cycle type evaporation unit is suitable for evaporation of aqueous solution and organic solvent, and has the effect of safe operation.

(2) This novel energy drive thermal cycle formula evaporation unit uses clean energy, and is energy-conserving effectual, and the running cost is low, and the energy consumption is 19% of single effect evaporator, is equivalent to seven effect evaporators, and the running cost is 30% of single effect evaporator.

(3) The novel energy-driven thermal cycle type evaporation unit has the advantages that heat energy is converted and recycled between evaporation and condensation.

(4) This novel energy drive thermal cycle formula evaporation unit, heat medium and refrigerant are same kind of medium, do not need boiler steam and cooling water, adopt clean energy (electricity) drive, do not need the cooling water, and little boiler steam (material preheats), no waste gas, waste water produce, and the environmental protection effect is obvious, reduces the carbon and discharges, sparingly builds the investment of boiler and cooling tower.

(5) This novel energy drive thermal cycle formula evaporation unit compares MVR vapor compressor, and this unit heat pump compressor promotes the big (20 ℃) of the difference in temperature of working medium, and operates steadily, and the noise is little.

(6) The novel energy-driven thermal circulation type evaporation unit adopts a clean heat exchange medium, so that scaling can not occur in heat exchange tubes of an evaporator and a condenser.

(7) According to the novel energy-driven thermal circulation type evaporation unit, the organic solvent liquid is not in contact with a compressor in the evaporation process, and the potential safety hazard of the organic solvent is eliminated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the range covered by the contents disclosed in the present invention.

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a schematic perspective view of the present invention;

fig. 3 is a schematic perspective view of another perspective structure of the present invention.

Illustration of the drawings:

1. a feed pump; 2. a preheater; 3. an evaporator; 4. a heater; 5. a separator; 6. a condenser; 7. a liquid receiving tank; 8. a cooling liquid tank; 9. a compressor; 10. a vacuum pump; 11. a support; 12. a control panel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

The embodiment is as follows: a novel energy-driven thermal circulation type evaporation unit is shown in figures 1-3 and comprises a material evaporation system and a heat pump system, wherein the material evaporation system comprises a feed pump 1 and a vacuum pump 10, the input end of the feed pump 1 is fixedly connected with a preheater 2 through a pipeline, the preheater 2 heats an initial raw material to a saturation temperature by using electric heating or a small amount of steam, the output end of the feed pump 1 is fixedly provided with an evaporator 3 through a pipeline, the raw material at the saturation temperature enters the evaporator 3 to exchange heat with a high-temperature heat medium, the raw material is heated and vaporized, the evaporator 3 can be designed into structural types such as an external circulation structure, a rising film structure, a falling film structure and the like according to production process requirements, the output end of the evaporator 3 is fixedly provided with a separator 5 through a pipeline, the output end of the separator 5 is fixedly provided with a condenser 6 through a pipeline, a vapor-liquid mixture of a feed liquid is subjected to vapor-liquid separation in the separator 5, the solvent is evaporated, the feed liquid is discharged after the specific gravity of the feed liquid reaches the process requirements, the solvent vapor is pumped into the condenser 6, and the output end of the condenser 6 is fixedly provided with a liquid receiving tank 7;

the heat pump system comprises a compressor 9, the compressor 9 adopts a special high-efficiency screw heat pump compressor, the compressor operates in a variable frequency mode, the oil return system is designed, the compressor 9 and other related components form a heat pump unit, the unit has safety protection functions such as a high-low pressure switch, motor overload protection and a safety valve, no potential safety hazard exists during operation, the input end of the compressor 9 is fixedly connected with a condenser 6 through a pipeline, the output end of the compressor 9 is fixedly connected with a heater 4 through a pipeline, when the heat pump system is used, a feed liquid is preheated to a saturation temperature through a preheater 2, the feed liquid is pumped into an evaporator 3 through a feed pump 1 to be heated and evaporated (feed liquid heat absorption process), the feed liquid is discharged after the specific gravity of the feed liquid meets the requirement, secondary steam generated by evaporation enters a condenser 6 to be condensed into liquid for recycling (material heat release process) after being separated by a separator 5, evaporation and concentration of the material is completed, meanwhile, a high-temperature and high-pressure working medium serving as a heat medium is transmitted to the feed liquid in the evaporator 3 (working medium is changed into a low-temperature and low-pressure state, and then enters the condenser 6 as a working medium to be evaporated working medium which is changed into a gaseous refrigerant, the working medium, the high-temperature and pressure release working medium after being compressed by the compressor 9, and then enters the compressor, the compressor to be used as a complete set of the energy-saving working medium, and the energy-saving working unit, and the energy-saving working medium is only used for recycling heat-saving working medium.

The condenser 6 is a threaded pipe type condenser 6, the separator 5 and the liquid receiving tank 7 are respectively fixedly connected with the input end and the output end of a material condensing pipe of the condenser 6, the compressor 9 is fixedly connected with the input end of a condensing liquid pipe of the condenser 6, and solvent steam is condensed into liquid in the condenser 6 by a refrigerant and is recovered.

And a cooling liquid tank 8 is fixedly arranged at the input end of the heater 4, and cooling liquid is stored in the cooling liquid tank 8.

The input end of the vacuum pump 10 is respectively fixedly connected with the heater 4 and the condenser 6, so that the feed liquid is evaporated at a low temperature, and the vacuum pump is suitable for concentration of thermosensitive materials.

And the outer wall surfaces of the evaporator 3, the heater 4 and the condenser 6 are fixedly provided with a bracket 11 for supporting and protecting the evaporator 3, the heater 4 and the condenser 6.

The preceding terminal surface fixed mounting of support 11 has control panel 12, and control panel 12 and charge pump 1, compressor 9 and vacuum pump 10 electric connection are provided with control system in the control panel 12, adopt PLC programming control, possess full automatic operation mode, have local or remote control function, large-scale colored touch-sensitive screen, man-machine conversation interface, easy and simple to handle, control system's control range includes: 1. the compressor 9 adopts frequency conversion control, and the speed of the compressor 9 can be adjusted on line through man-machine conversation in an operating state so as to be suitable for different working conditions; 2. detecting the liquid level of the material to control the start and stop of the feed pump 1, thereby realizing automatic material supplement; 3. detecting the temperature and pressure of the material at an evaporation end and a condensation end, controlling the operating condition of the working medium of the heat pump, and controlling the vacuum system; 4. detecting the temperature and pressure of the working medium of the heat pump in the condensation and evaporation states, and controlling the running state of the heat pump system; 5. detecting the temperature of the materials, controlling the evaporation end time and automatically discharging the materials.

The working principle of the invention is as follows: when the energy-saving evaporator is used, a feed liquid is preheated to a saturation temperature through the preheater 2, the feed liquid is pumped into the evaporator 3 through the feed pump 1 to be heated and evaporated (a feed liquid heat absorption process), the specific gravity of the feed liquid is discharged after meeting the requirement, secondary steam generated by evaporation enters the condenser 6 after being separated by the separator 5 to be condensed into liquid for recycling (a material heat release process), evaporation and concentration of the material are completed, meanwhile, a high-temperature high-pressure working medium serves as a heating medium to release heat in the evaporator 3 and transfer to the feed liquid (a working medium heat release process), the working medium becomes a low-temperature low-pressure state after releasing heat, the working medium enters the condenser 6 as a cooling medium to absorb the heat of the secondary steam (a working medium heat absorption process), the working medium becomes a gaseous state from a liquid state, the temperature and the pressure of the working medium are increased after being compressed by the compressor 9, the high-temperature high-pressure working medium enters the evaporator 3 again, the heat energy is recycled, the energy-saving purpose is achieved, only by preheating of the feed liquid and the work and the energy consumption of the compressor 9 is low.

The energy efficiency of the electrically-driven thermal cycle type heat pump evaporation unit is compared with that of the single-effect evaporator, so that the following table is obtained

The following table is obtained by carrying out experimental tests on the thermal circulation type heat pump evaporation unit

TABLE 1 summary of experimental data

Table 2 summary of experimental data (continuation)

Description of the drawings: the evaporation temperature refers to a temperature at which the refrigerant evaporates, and the condensation temperature refers to a temperature at which the refrigerant condenses.

Analysis of Experimental results

As can be seen from tables 1 and 2, in this test, the evaporation capacity per unit of electricity varies from 7.29L/kWh to 9.25L/kWh, the evaporation capacity per unit hour varies from 305.7L/h to 349.3L/h, the energy efficiency (COP) varies from 4.78 to 6.07, the chemical temperature is substantially within the range of 56 to 58.4 ℃ (the design chemical temperature is 60 ℃), the evaporation temperature is substantially within the range of 41.9 to 48.4 ℃ (the design evaporation temperature is 50 ℃), and the condensation temperature is substantially within the range of 76.2 to 78.9 ℃ (the design condensation temperature is 75 ℃).

Note: the actual evaporation rate is somewhat greater than the evaporation rate in the table because the amount of vapor pumped by the vacuum pump is not measured.

Through experiments, the following characteristics and advantages of the electrically-driven thermal cycle type heat pump evaporation unit can be obtained.

1. The energy-saving effect is good, the operation cost is low, the energy consumption is 19 percent of that of a single-effect evaporator, the energy-saving effect is equivalent to that of a seven-effect evaporator, and the operation cost is 30 percent of that of the single-effect evaporator.

2. The heat exchange medium of evaporation and condensation is the same working medium, and the clean energy (electricity) drive is adopted, does not need cooling water, and little boiler steam (material preheating) does not produce waste gas, waste water, and the environmental protection effect is obvious, reduces the carbon emission, saves the investment of building boiler and cooling tower.

3. Because the clean heat exchange medium is adopted, the heat exchange tubes of the evaporator and the condenser can not generate scale.

4. The same equipment is suitable for the evaporation and concentration of the aqueous solution and the organic solvent, and the solvent recovery rate is high (more than 95%).

5. The organic solvent liquid is not contacted with the compressor in the evaporation process, thereby eliminating the potential safety hazard of the organic solvent.

6. The selected refrigerant has ODP value and GWP value which accord with national regulations.

7. Compared with an MVR vapor compressor, the temperature difference of the working medium of the heat pump compressor of the unit is large (20 ℃), the operation is stable, and the noise is low.

8. The machine set has high automation degree, full-automatic control operation and low labor intensity of workers.

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Claims (6)

1. The utility model provides a novel energy drive thermal cycle formula evaporation unit, includes material vaporization system and heat pump system, its characterized in that: the material evaporation system comprises a feeding pump (1) and a vacuum pump (10), the input end of the feeding pump (1) is fixedly connected with the preheater (2) through a pipeline, the output end of the feeding pump (1) is fixedly provided with an evaporator (3) through a pipeline, the output end of the evaporator (3) is fixedly provided with a separator (5) through a pipeline, the output end of the separator (5) is fixedly provided with a condenser (6) through a pipeline, and the output end of the condenser (6) is fixedly provided with a liquid receiving tank (7);

the heat pump system comprises a compressor (9), wherein the input end of the compressor (9) is fixedly connected with a condenser (6) through a pipeline, and the output end of the compressor (9) is fixedly connected with a heater (4) through a pipeline.

2. The novel energy-driven thermal cycle evaporation unit as claimed in claim 1, wherein: condenser (6) are the screw thread tubular condenser, separator (5) with receive liquid jar (7) respectively with the material condenser pipe input output end fixed connection of condenser (6), compressor (9) and the condensate pipe input fixed connection of condenser (6).

3. The novel energy-driven thermal cycle evaporator set as claimed in claim 1, wherein: and a cooling liquid tank (8) is fixedly arranged at the input end of the heater (4), and cooling liquid is stored in the cooling liquid tank (8).

4. The novel energy-driven thermal cycle evaporator set as claimed in claim 1, wherein: and the input end of the vacuum pump (10) is fixedly connected with the heater (4) and the condenser (6) respectively.

5. The novel energy-driven thermal cycle evaporation unit as claimed in claim 1, wherein: and the outer wall surfaces of the evaporator (3), the heater (4) and the condenser (6) are fixedly provided with a bracket (11).

6. The novel energy-driven thermal cycle evaporation unit as claimed in claim 5, wherein: the front end face of the support (11) is fixedly provided with a control panel (12), and the control panel (12) is electrically connected with the feed pump (1), the compressor (9) and the vacuum pump (10).

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