CN101274785A

CN101274785A - Falling film evaporator with ring-shaped corrugated tube for seawater desalination

Info

Publication number: CN101274785A
Application number: CNA2007100866184A
Authority: CN
Inventors: 张建城
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-03-27
Filing date: 2007-03-27
Publication date: 2008-10-01

Abstract

The invention relates to a technique for producing a falling film evaporator used in sea water desalinization by using a ring-shaped corrugated tube. The falling film evaporator fully uses the designed structure of a ring-shaped glomeration, thus changing traditional straight tube falling film vaporization mechanism and further promoting evaporation efficiency. The evaporator is applicable to a multi-effect evaporation and sea water desalinization mode and pertains to the technical field of sea water desalinization.

Description

Falling film evaporator with ring-shaped corrugated tube for seawater desalination

Technical field

The present invention relates to a kind ofly utilize ring-like bellows tube to manufacture sea water desaltination falling-film evaporator technology, this device makes full use of ring-like spherule project organization, changed traditional straight tube falling film evaporation mechanism, further improved vaporization efficiency, this vaporizer is applicable to the desalting seawater through multi-effect evaporation pattern.Belong to field of sea water desalting technology.

Background technology

Seawater and brackish water are being carried out in the desalination process, routine techniques mainly contains distillation method, ion exchange method, dialysis, reverse osmosis membrane and cold method etc., wherein distillation method mainly adopts phase change technique to realize desalination, as modes such as multistage flash evaporation, low-temperature multi-effect evaporation and vapour compression.The topmost advantage of phase transformation class just is to make full use of renewable energy sources such as industrial exhaust heat or sun power, and can reuse the latent heat of evaporation and condensation, therefore is widely adopted in sea water desaltination.Vaporizer is the key part in such device, the desalination effect is played an important role, this class vaporizer generally adopts vertical tube falling film evaporation and horizontal tube falling film evaporation, horizontal tube falling film evaporation is the evaporation technique that new development is got up, and mainly utilizes liquid to condense and the separating of membranaceous mobile realization liquid phase and steam at extratubal falling film.It is generally acknowledged that level pipe is that the heat transfer coefficient of horizontal tube falling film evaporation is flash distillation or vertical tube evaporation 1.5-2 a times.But present horizontal falling film evaporation pipe mostly is light pipe, promptly adopts copper straight tube welding combination, and this structure has only utilized two walls in the generating tube outside to realize falling film evaporation.Adopt and axially become wavy annular corrugated or bellows tube, can make full use of its globosity design, increased heat interchanging area on the one hand, improved intensity, changed interior heat transfer type on the other hand, the most important thing is to have changed falling film evaporation mechanism, therefore obviously improve than traditional straight tube vaporization efficiency.Annular corrugated or bellows tube is used widely in the heat exchange industry, belong to known technology, the heat exchange effect is apparently higher than straight pipe heat exchanger, if it is applied on the seawater desalination evaporators, then can on original technological achievement basis, further improve evaporation of seawater and desalination efficient.

Summary of the invention

Technical problem to be solved by this invention is for sea water desalinating plant provides new vaporizer and module, further improves sea water desaltination output.

The alleged problem of the present invention is solved by following technical scheme:

This vaporizer mainly is made up of ring-like node generating tube, pipe top board, condenser, fresh water dish, seawater spraying device, traverse baffle.

Described ring-like node generating tube is axially to become wavy metal tube.

Described pipe top board is the expanded metal of the ring-like bellows tube of bearing metal, and the while is as the outer case member of evaporation element module.

Described condenser, fresh water dish, seawater spraying device, traverse baffle are the main conventional components of evaporation element module.Condenser is that separate unit and evaporation element divide the body structure setting.

Described falling film evaporator with ring-shaped corrugated tube is selected the ring-like bellows tube of metal of sufficient amount according to steam output, its length requires decision according to desalination unit scale and evaporation area, and with each root pipe be welded on respectively the pipe top board on, afterwards with heating agent flow passage cover plate and welding of pipe top board or sealing, the heating agent interface can be located on the heating agent flow passage cover plate, as shown in Figure 1.Its special feature is: when the seawater through spraying or other need the generating tube of spissated liquid process sphere structure design, in the ring-like bellows tube spherome surface uniform distribution and the film forming of condensing, at high temperature fluid during by ring-like node generating tube, interior heat-transfer fluid forms disturbance in pipe, its heat energy is evenly distributed to each node, accelerates the extratubal falling film evaporation.In novel ring-like bellows tube evaporation module, vaporised gas condenses into water at condenser, is collected by the fresh water dish of bottom and sends vaporizer, discharges through relief outlet through the seawater of evaporation concentration.This evaporator module can be provided with a plurality of, is linked in sequence, and the step evaporation, as shown in Figure 2, or the design mix body structure is as shown in Figure 3.The outstanding feature of this evaporator module is that evaporation area is big under identical tube bank, falling film evaporation mechanism novelty, vaporization efficiency height.This vaporizer is applicable to that also doing evaporative component in the absorption type air-conditioner refrigeration equipment uses.

Description of drawings

Fig. 1: be the ring-like bellows tube vaporizer of the present invention synoptic diagram

Fig. 2: be the ring-like bellows tube evaporation of the present invention module diagram

Fig. 3: be the ring-like bellows tube evaporation of the present invention split module diagram

Wherein: 1 ring-like node generating tube; 2 pipe top boards; 3 heating agent flow passage cover plates; 4 heating agent imports; The outlet of 5 heating agents; 6 sea intakes; 7 vaccum exhaust outlets; 8 refrigerants are imported and exported; 9 water outlets; The outlet of 10 concentrated seawaters; 11 traverse baffles; 12 steam are imported and exported

Embodiment

Embodiment one:

Ring-like node generating tube 1 adopts metal straight pipe to process through plastotype, selects the ring-like bellows tube 1 of metal of sufficient amount then according to steam output, and its length is according to desalination unit and evaporation area decision; The ring-like node generating tube 1 of each root is welded on respectively on the pipe top board 2, afterwards with heating agent flow

passage cover plate

3 and 2 welding of pipe top board, heating agent interface 4,5 is located at respectively on the heating agent flow passage cover plate 3, can be made into square as the independent assembly of vaporizer, also can do circular.But this embodiment broadened application is made the lithium-bromide solution vaporizer and is used in the absorption type air-conditioner refrigeration equipment.As shown in Figure 1.

Embodiment two:

When making the ring-like node vaporizer of monolithic devices, prolong the outer case member of pipe top board 2 as module, condenser, the fresh water dish, the seawater spraying device is installed in ring-like node generating tube top, belong to condenser, the fresh water dish, the heating agent import 4 of seawater spraying device, heating agent outlet 5, sea intake 6, refrigerant imports and exports 8, water outlet 9 and vaccum exhaust outlet 7, steam is imported and exported 12 airtight respectively successively being fixed on the two side pipe top boards, traverse baffle 11 is fixed on seawater spraying device top, seawer outlet 10 is installed in base of evaporator, the combination assembling finishes, and is sealed into complete module with the metal cover plate.As shown in Figure 2.

Embodiment three:

Condenser independently is provided with as the unit of module, and finned prolong is installed in condensing chamber middle part, and refrigerant imports and exports 8, steam imports and exports 12, vaccum exhaust outlet 7, water outlet 9 is airtight respectively successively is fixed on condenser two side bodies.Other structures are the same.As shown in Figure 3.

Because ring-like node generating tube increased evaporation area, need spissated liquid in the spherome surface film forming evaporation that more helps condensing through the seawater of spray or other, therefore obviously improve than straight tube falling film evaporation efficient.The utility model also is fit to the spissated liquid evaporation equipment of various need and uses as the evaporative component in the absorption refrigeration conditioning unit except that being applicable to sea water desaltination, because functions of use is identical without exception within protection domain of the present invention.

Claims

1. the falling film evaporator with ring-shaped corrugated tube and the evaporator unit module that are applicable to the multi-effect sea water desalting pattern mainly are made up of ring-like bellows tube, pipe top board, condenser, fresh water dish, seawater spraying device, traverse baffle and corresponding pipe joint, it is characterized in that: described multi-effect sea water desalting falling-film evaporator is made of the ring-like bellows tube that quantity does not wait, and ring-like bellows tube is welded on the pipe top board of both sides; Condenser, fresh water dish, seawater spraying device, traverse baffle are weldingly fixed on ring-like node falling film evaporation pipe top respectively.

2. follow according to the described falling film evaporator with ring-shaped corrugated tube of claim 1, it is characterized in that: described ring-like bellows tube is for axially becoming wavy metal tube or metallic bellows.

3. follow according to the described falling film evaporator with ring-shaped corrugated tube of claim 1, it is characterized in that: described pipe top board is the expanded metal of the ring-like bellows tube of bearing metal.

4. follow according to the described falling film evaporator with ring-shaped corrugated tube of claim 1, it is characterized in that: the condenser of described falling film evaporator with ring-shaped corrugated tube unit module, fresh water dish, seawater spraying device and corresponding pipe joint are separately fixed on two side pipe top boards or the housing outer wall.

5. follow according to the described falling film evaporator with ring-shaped corrugated tube of claim 1, it is characterized in that: the condenser of described falling film evaporator with ring-shaped corrugated tube module and vaporizer split are provided with, and corresponding pipe joint is separately fixed on condenser shell outer wall and the falling film evaporator with ring-shaped corrugated tube unit module two side pipe top boards.

6. follow according to the described falling film evaporator with ring-shaped corrugated tube of claim 1, it is characterized in that: described falling film evaporator with ring-shaped corrugated tube is installed in refrigerant solution evaporator sections such as lithiumbromide as the evaporative component in the absorption type air-conditioner refrigeration equipment.