CN109987666B - Flexible falling film natural evaporation wastewater concentration unit and multi-section negative pressure natural evaporation wastewater concentration device - Google Patents
Flexible falling film natural evaporation wastewater concentration unit and multi-section negative pressure natural evaporation wastewater concentration device Download PDFInfo
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- CN109987666B CN109987666B CN201910239724.4A CN201910239724A CN109987666B CN 109987666 B CN109987666 B CN 109987666B CN 201910239724 A CN201910239724 A CN 201910239724A CN 109987666 B CN109987666 B CN 109987666B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
Abstract
The unit comprises a shell, a plurality of parallel flexible fiber falling film surfaces are uniformly distributed in the shell, a liquid guide cone is arranged on the upper part between every two adjacent flexible fiber falling film surfaces, the inlet of the liquid guide cone is connected with a wastewater distribution pipe, the outlet of the liquid guide cone is arranged at the top of the liquid guide cone, the liquid guide cone is used for overflowing wastewater from the outlet at the top of the liquid guide cone, so that the wastewater flows downwards to the surfaces of the flexible fiber falling film surfaces under the action of gravity, a layer of uniform falling liquid film is formed on the surfaces of the flexible fiber falling film surfaces under the capillary action of fibers, and the falling liquid film and hot flue gas or hot waste gas are subjected to wastewater concentration through heat-moisture exchange. The method has the advantages of no need of consuming steam or high-quality heat source, no flushing water system, compact equipment, no rotating part, stable and reliable system and wide market application prospect.
Description
Technical Field
The utility model belongs to the field of waste water pollutant treatment, especially relate to a flexible falling film natural evaporation waste water concentration unit and multistage negative pressure natural evaporation waste water concentration device.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The steel industry belongs to the industry with high water consumption in national economy of China, and simultaneously, along with the coming of series environmental protection policies, the industry development mode begins to be changed from extensive type to intensive type. In which wastewater treatment is also changed from "zero discharge" to actively seeking for reduced water consumption and wastewater reclamation. The total water consumption of 122 member units in the China iron and steel industry in 2017 is 835.9186 hundred million m3Taking 18.3571 hundred million m of fresh water3The index of new water consumption per ton of steel is 2.87m3T is calculated. The whole-plant drainage of the iron and steel enterprises mainly comes from the production wastewater of forced sewage discharge, filtration and backwashing and the like of circulating water systems matched with all production units, and the drainage of domestic water facilities such as canteens, bathrooms, toilets and the like dispersed everywhere. For whole plant drainageThe treatment and recycling until reaching zero emission is the key of water saving work.
The investment and operation cost of zero discharge of waste water are mainly concentrated on an evaporative crystallization device, and how to reduce the treatment scale of the evaporative crystallization device is also a difficult point. As far as the inventor knows, the High Efficiency Reverse Osmosis (HERO) process currently applied in practical projects needs to continuously adjust the pH value, consumes a large amount of acid and alkali, increases the operation cost, and shortens the service life of the membrane; the resin regeneration also increases a large amount of acid and alkali waste liquid, and increases the treatment difficulty; the single membrane of a Disc Tube (DTRO) has small water yield and high pressure, and a certain difficulty exists in the maintenance when multiple components run; the selection of forward osmosis draw solution is controversial all the time, and the recovery of the draw solution is difficult to a certain extent; the requirement of ultrahigh pressure RO on pretreatment is also very high, and whether a proper intersegment booster pump can be selected or not is also difficult in high recovery rate; the electrodialysis ED membrane cannot guarantee the quality if a domestic membrane is adopted, but the price of an imported homogeneous membrane is higher, and the produced water of an ED system needs to be desalted again. At present, the mechanical evaporation recompression (MVR) technology emerging in the field of salt-containing wastewater treatment reuses the condensation latent heat of secondary steam generated in the evaporation concentration process, recovers a large amount of high-quality condensed water, realizes the maximum reduction of salt-containing wastewater, basically realizes zero emission of wastewater, still needs to consume a large amount of steam, and has high investment cost.
How to make the wastewater reduction system operate stably and reduce the investment and the operating cost needs to be further widened. It should be noted that, at present, the waste heat resources of the steel plant are huge, such as the waste heat of the cooling air, the waste heat of the flue gas of the sintering machine, the sensible heat of the hot pellets, the heat of the slag flushing water, the waste heat of the flue gas of the steel making, the heat of the slag stewing water, the waste heat of the flue gas of the steel rolling heating furnace, the waste heat of the flue gas of the lime kiln, the waste heat of the flue gas of the boiler, and the like, if the discharged waste heat (steam, hot water, hot air, and the like) is fully utilized, the low-concentration waste water is naturally evaporated by multi-stage negative pressure falling film, and the concentrated waste water is sent.
Disclosure of Invention
In order to solve the defects of the prior art, the flexible fiber fabric with excellent acid and alkali corrosion resistance is used as a base material to serve as a multi-section negative-pressure natural evaporation surface, the flexible falling film natural evaporation wastewater concentration unit and the multi-section negative-pressure natural evaporation wastewater concentration device are provided, the device is high in utilization rate of the evaporation surface, compact in equipment, free of rotating parts and stable and reliable in system.
In order to achieve the purpose, the technical scheme of the disclosure is as follows:
a flexible falling film natural evaporation wastewater concentration unit comprises a shell, wherein a plurality of parallel flexible fiber falling film surfaces are uniformly distributed in the shell, a liquid guide cone is arranged at the upper part between every two adjacent flexible fiber falling film surfaces, the inlet of the liquid guide cone is connected with a wastewater distribution pipe, the outlet of the liquid guide cone is arranged at the top of the liquid guide cone, the liquid guide cone is used for overflowing wastewater from the outlet at the top of the liquid guide cone, so that the wastewater flows downwards to the surfaces of the flexible fiber falling film surfaces under the action of gravity, a layer of uniform falling liquid film is formed on the surfaces of the flexible fiber falling film surfaces under the capillary action of fibers, and the falling liquid film and hot flue gas or hot waste gas are subjected to wastewater concentration through heat and humidity exchange.
Furthermore, the upper side and the lower side of the shell are fixed with clamping grooves which are uniformly and symmetrically distributed, the clamping grooves are used for fixing corresponding upper positioning rods or lower positioning rods, and the upper positioning rods and the lower positioning rods are used for stretching and fixing the flexible fiber film descending surface.
Furthermore, sewing holes are formed in two ends of the flexible fiber falling film surface, and the two ends of the flexible fiber falling film surface are respectively fixed to the upper positioning rod and the lower positioning rod through the sewing holes.
Further, the thickness of the fiber cloth on the flexible fiber landing film surface is 0.7-1.0 mm, and the air permeation is 70-200L/(m)2·s)。
Furthermore, the flexible fiber landing film surface can be made of polypropylene fiber, polyester fiber or nylon fiber materials.
Furthermore, the liquid guide cone is a triangular corrugated stainless steel liquid guide cone, a wastewater flow channel is arranged inside the triangular corrugated stainless steel liquid guide cone, and a plurality of groups of wastewater outlets are uniformly arranged at the top of the triangular corrugated stainless steel liquid guide cone;
the liquid guide cone is fixed on the shell through the positioning groove.
Furthermore, the flow direction of the hot flue gas or the hot waste gas is parallel to the falling film surface of the flexible fiber, and the flow speed is 5-20 m/s.
Furthermore, a concentrated liquid tank is arranged below the shell and used for collecting the concentrated wastewater.
The utility model provides a multistage negative pressure natural evaporation waste water enrichment facility, includes as above a plurality of flexible falling film natural evaporation waste water enrichment units that set gradually, connect through waste water distribution water network between flexible falling film natural evaporation waste water enrichment unit.
Further, the waste water distribution pipe network includes that one is responsible for and a plurality of branch pipe, it links to each other with the drain awl of first flexible falling liquid film natural evaporation waste water concentration unit through electric control valve to be responsible for, the branch pipe sets up between two flexible falling liquid film natural evaporation waste water concentration units for connect the concentrate groove of a flexible falling liquid film natural evaporation waste water concentration unit and the drain awl of next flexible falling liquid film natural evaporation waste water concentration unit, the branch pipe passes through electric control valve and links to each other with the drain awl.
Further, the flow pressure of the electric control valve is controlled by a PLC.
Compared with the prior art, the beneficial effect of this disclosure is:
the flexible falling film multi-section negative pressure natural evaporation wastewater concentration device and the process are based on the current situation of waste heat discharge in the steel industry, the waste heat of hot waste air or hot flue gas and the like is taken as a heat source, the total waste water is arranged on the surface of polypropylene fiber, terylene and nylon fiber materials with excellent acid-base corrosion resistance to form a thickness-controllable precipitation film through a triangular corrugated stainless steel liquid guide cone with integrated functions of water retaining, water dividing and channel isolation, the waste water is subjected to heat and moisture exchange with hot flue gas or hot waste gas, water enters the flue gas or the waste gas through molecular diffusion evaporation to form a waste water concentration method with controllable concentration ratio based on waste heat utilization, compared with the traditional wastewater reduction process or technology, the method has the advantages of no need of consuming steam or high-quality heat source, no flushing water system, compact equipment, no rotating part, stable and reliable system and the like, and has wide market application prospect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic view of a multi-stage negative-pressure natural falling-film evaporation wastewater concentration process on the surface of a flexible fiber according to an embodiment of the disclosure;
FIG. 2 is a front view of a unit structure of a falling film evaporation wastewater concentration device according to an embodiment of the present disclosure;
FIG. 3 is an enlarged view of FIG. 2 at D;
FIG. 4 is a side view of a unit configuration of a falling film evaporation wastewater concentration device in accordance with an embodiment of the present disclosure;
fig. 5(a) - (b) are schematic structural views of a drainage cone according to an embodiment of the disclosure, wherein (a) is a side view and (b) is a front view;
figure 6 is a schematic diagram of a single falling film configuration according to an embodiment of the present disclosure;
in the figure: 1. an upper positioning rod; 2. a card slot; 3. a liquid guiding cone; 4. positioning a groove; 5. a flexible fiber film descending surface; 6. a concentrated solution tank; 7. a water distribution pipe; 8. a flexible falling film natural evaporation wastewater concentration unit; 9. a liquid film; 10. a lower positioning rod.
Detailed Description
The present disclosure is further described with reference to the following detailed description of illustrative embodiments and accompanying drawings.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only relational terms determined for convenience in describing structural relationships of the parts or elements of the present disclosure, and do not refer to any parts or elements of the present disclosure, and are not to be construed as limiting the present disclosure.
In the present disclosure, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present disclosure can be determined on a case-by-case basis by persons skilled in the relevant art or technicians, and are not to be construed as limitations of the present disclosure.
As one or more embodiments, as shown in fig. 2 to 4, a flexible falling film natural evaporation wastewater concentration unit 8 includes a housing, an upper positioning rod 1, a lower positioning rod 10, a liquid guiding cone 3, a water distribution pipe 7, a flexible fiber falling film surface 5, and a concentrated liquid tank 6, wherein the housing is welded at upper and lower sides thereof with symmetrically and uniformly distributed slots 2, each slot 2 is fixed with a corresponding upper positioning rod 1 or lower positioning rod 10, the upper positioning rod 1 and the lower positioning rod 10 are used for stretching and fixing the flexible fiber falling film surface 5, both ends of the flexible fiber falling film surface 5 are provided with sewing holes for penetrating through the positioning rods, the housing is further provided at an upper portion with positioning grooves 4, the positioning grooves 4 are used for fixing the liquid guiding cones 3, the liquid guiding cones 3 are distributed between two adjacent flexible fiber falling film surfaces 5 in an array manner, inlets of the liquid guiding cones 3 are connected with the wastewater distribution pipe 7, in specific implementation, after wastewater enters the liquid guiding cone 3 through the wastewater distribution pipe 7, the wastewater overflows from an overflow port at the top of the liquid guiding cone 3 and then flows onto the flexible fiber falling film surface 5 to be evaporated and concentrated, and the concentrated solution tank 6 is arranged below the shell.
The flexible fiber falling film surface 5 is made of polypropylene fiber, polyester fiber or nylon flexible fiber material with excellent acid and alkali corrosion resistance, and the flexible fiber falling film surface 5 is a double-sided falling film.
The thickness of the fiber cloth of the flexible fiber falling film surface 5 is 0.7-1.0 mm, and the air permeability is 70-200L/(m)2·s)。
In specific implementation, as shown in fig. 2, each flexible falling film natural evaporation wastewater concentration unit 8 comprises 18-35 flexible fiber falling film surfaces 5, the flexible fiber falling film surfaces 5 are arranged at intervals of 30-80 mm, and the height of the flexible falling film natural evaporation wastewater concentration unit 8 is 3-8 meters and the span is 1-2 meters.
The liquid guide cone 3 is a triangular corrugated stainless steel liquid guide cone which is integrally designed for water retaining, water distributing and channel isolation, and can ensure that a flue gas circulation channel is regular and a water film is uniform; as shown in fig. 5(a) - (b), a plurality of groups of overflow ports with width of 5mm and length of 50-80 mm are uniformly arranged on the top of the liquid guiding cone 3, in the specific implementation, wastewater overflows from the overflow ports on the top of the triangular corrugated stainless steel liquid guiding cone, flows downwards along the corrugations to the fiber surface under the action of gravity, and then rapidly diffuses and permeates around by utilizing the capillary action of the fibers, so that a layer of uniform liquid falling film 9 can be rapidly formed on the fiber surface, as shown in fig. 6; the water distribution process has no splashing, and the safe operation of subsequent equipment can be ensured.
The wastewater can be led from a sewage discharge pipe of an iron and steel plant.
The clamping groove 2 and the positioning groove 4 are both made of stainless steel materials, and the concentrated solution tank 6 is made of carbon steel and glass flake anticorrosive materials.
As one or more embodiments, a flexible falling film multistage negative pressure natural evaporation wastewater concentration device comprises a plurality of flexible falling film natural evaporation wastewater concentration units 8 which are arranged in sequence, wherein each natural evaporation wastewater concentration unit 8 is connected through a wastewater distribution pipe network.
Waste water distribution pipe network includes that one is responsible for and a plurality of branch pipe, be responsible for and be in the same place through flange joint through electric control valve and the triangle ripple stainless steel drain cone 3 of first flexible falling liquid film natural evaporation waste water concentration unit 8, the branch pipe sets up between two flexible falling liquid film natural evaporation waste water concentration units 8 for connect the concentrate groove 6 of last flexible falling liquid film natural evaporation waste water concentration unit 8 and the triangle ripple stainless steel drain cone 3 of next flexible falling liquid film natural evaporation waste water concentration unit 8, the branch pipe passes through electric control valve and triangle ripple stainless steel drain cone 3 and passes through flange joint together, in the concrete implementation, electric control valve flow pressure is controlled by PLC, can realize the inhomogeneous water distribution of different flexible falling liquid film thickness, falling liquid film thickness accurate control.
In specific implementation, the flexible falling film multi-section negative pressure natural evaporation wastewater concentration device is arranged in a flue or an air duct, and the flexible fiber falling film surface 5 is parallel to the flow direction of hot flue gas or hot air. Hot flue gas or hot air passes through the reactor at the flow speed of 5-20 m/s, the gas turbulence degree is severe, the heat transfer coefficient between liquid films is increased, the wastewater is easy to concentrate, and evaporation regulation is facilitated; the dirt on the surface of the cloth is not easy to adhere along with the wind, and a flushing water system is not needed.
In the embodiment, double-sided natural negative pressure multi-section evaporation is adopted, so that the utilization rate of an evaporation surface is high, the equipment is compact, no rotating part is arranged, and the system is stable and reliable.
The specific operation process of this embodiment is shown in fig. 1, and is as follows:
hot flue gas or hot waste gas sequentially passes through a plurality of flexible falling film natural evaporation waste water concentration units 8 arranged in a flue according to a preset cooling requirement, the flexible falling film natural evaporation waste water concentration units 8 are spliced according to the shape of the flue or the air duct, high-concentration salt water or waste water is sent into the flexible falling film natural evaporation waste water concentration units 8 from one end to form liquid films 9 on the surfaces of flexible fiber falling film surfaces 5, then the liquid films 9 are converged into a concentrated solution tank 6 and then sent into the next natural falling film evaporation waste water concentration unit 8 to be gradually concentrated in sequence, the liquid films 9 and the hot flue gas or waste gas are subjected to heat and moisture exchange, water enters the flue gas or waste gas through molecular diffusion evaporation, multi-section negative pressure natural falling film evaporation can be carried out according to the temperature condition of the hot waste gas or the hot flue gas, a waste water concentration method based on controllable concentration ratio of waste heat utilization is formed, the waste water is concentrated and then enters a crystallization, and after the temperature is reduced, the hot flue gas or the hot waste gas with the temperature meeting the treatment requirement of the lower flow enters downstream equipment, and the concentrated wastewater enters subsequent crystallization desalting equipment.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (7)
1. The utility model provides a flexible falling film natural evaporation waste water concentration unit which characterized in that: the device comprises a shell, wherein a plurality of parallel flexible fiber falling film surfaces are uniformly distributed in the shell, a liquid guide cone is arranged at the upper part between every two adjacent flexible fiber falling film surfaces, the inlet of the liquid guide cone is connected with a wastewater distribution pipe, the outlet of the liquid guide cone is arranged at the top of the liquid guide cone, the liquid guide cone is used for overflowing wastewater from the outlet at the top of the liquid guide cone, so that the wastewater flows downwards to the surface of the flexible fiber falling film surfaces under the action of gravity, a uniform and thickness-controllable falling liquid film is formed on the surface of the flexible fiber falling film surfaces under the capillary action of fibers, the falling liquid film and hot flue gas or hot waste gas carry out wastewater concentration through heat and moisture exchange, and the flow direction of the waste gas is parallel to the falling film surfaces;
the liquid guide cone is a triangular corrugated stainless steel liquid guide cone, a wastewater flow channel is arranged inside the triangular corrugated stainless steel liquid guide cone, and a plurality of groups of wastewater outlets are uniformly arranged at the top of the triangular corrugated stainless steel liquid guide cone;
clamping grooves which are uniformly and symmetrically distributed are fixed on the upper side and the lower side of the shell, the clamping grooves are used for fixing corresponding upper positioning rods or lower positioning rods, and the upper positioning rods and the lower positioning rods are used for stretching and fixing the flexible fiber film descending surface;
the flexible fiber falling film surface is made of polypropylene fiber, polyester fiber or nylon flexible fiber material with excellent acid and alkali corrosion resistance;
and two ends of the flexible fiber falling film surface are respectively fixed on the upper positioning rod and the lower positioning rod through the sewing holes.
2. The flexible falling film natural evaporation wastewater concentration unit of claim 1, wherein the fiber cloth thickness of the flexible fiber falling film surface is 0.7-1.0 mm, and the air permeability is 70-200L/(m)2·s）。
3. A flexible falling film natural evaporation wastewater concentration unit as in claim 1, wherein the funnel is fixed to the housing by a positioning slot.
4. The flexible falling film natural evaporation wastewater concentration unit as claimed in claim 1, wherein the flow velocity of the hot flue gas or the hot waste gas is 5-20 m/s.
5. The flexible falling film natural evaporation wastewater concentration unit as claimed in claim 1, wherein a concentrate tank is arranged below the shell, and the concentrate tank is used for collecting concentrated wastewater.
6. A multi-section negative-pressure natural evaporation wastewater concentration device, which is characterized by comprising a plurality of flexible falling film natural evaporation wastewater concentration units according to any one of claims 1 to 5, wherein the flexible falling film natural evaporation wastewater concentration units are sequentially arranged and are connected through a wastewater distribution water pipe network.
7. The multi-stage negative-pressure natural evaporation wastewater concentration device of claim 6, wherein the wastewater distribution pipe network comprises a main pipe and a plurality of branch pipes, the main pipe is connected with the liquid guiding cone of the first flexible falling film natural evaporation wastewater concentration unit through an electric control valve, the branch pipes are arranged between the two flexible falling film natural evaporation wastewater concentration units and are used for connecting the concentration liquid tank of the upper flexible falling film natural evaporation wastewater concentration unit and the liquid guiding cone of the next flexible falling film natural evaporation wastewater concentration unit, and the branch pipes are connected with the liquid guiding cone through the electric control valve.
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| CN207507038U (en) * | 2017-11-17 | 2018-06-19 | 东明昌盛源科技有限公司 | A kind of falling film evaporator with cleaning device |
| CN109341141A (en) * | 2018-08-27 | 2019-02-15 | 山东大学 | A kind of extratubal falling film heat-pipe-type absorption heat-exchanger rig |
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| CN86102212A (en) * | 1986-03-30 | 1987-02-11 | 齐宏立 | Cloth-type evaporator |
| CN2052682U (en) * | 1988-09-23 | 1990-02-14 | 王风岐 | External flow and free droping membrance plate type evaporator |
| CN2164308Y (en) * | 1993-07-10 | 1994-05-11 | 河北工学院 | Material liquid film forming device for falling-film evaporator |
| JP4688842B2 (en) * | 2007-04-27 | 2011-05-25 | 東京瓦斯株式会社 | Wastewater treatment method |
| CN102288060A (en) * | 2011-06-13 | 2011-12-21 | 苏州新太铜高效管有限公司 | Film falling evaporation heat exchange pipe with fins made from silk screen |
| CN106669208B (en) * | 2016-12-21 | 2019-01-18 | 山东大学 | A kind of system and technique for strengthening brine waste concentration using low-temperature flue gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207507038U (en) * | 2017-11-17 | 2018-06-19 | 东明昌盛源科技有限公司 | A kind of falling film evaporator with cleaning device |
| CN109341141A (en) * | 2018-08-27 | 2019-02-15 | 山东大学 | A kind of extratubal falling film heat-pipe-type absorption heat-exchanger rig |
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