CN201093905Y - An inorganic heat pipe spray evaporator - Google Patents

Abstract

The utility model relates to an inorganic heat pipe spray evaporator, which belongs to a heat exchange device. Including ejector 1, valve 2, water pump 3, pump 4, foam catcher 5, sprayer 6, foam catcher 7, sprayer 9, housing 11, sump 12 and sump 14, its It is characterized in that several inorganic heat pipes are divided into tube bundles 10 of the liquid preheating section, tube bundles 13 of the heating section and tube bundles 15 of the liquid evaporation section by a partition 8; several through holes are designed on the partition 8, and the diameter of the through holes is equal to The diameter of the inorganic heat pipe; the connection between the separator 8 and the inorganic heat pipe is sealed. The advantages are: the heat transfer capacity of the existing spray evaporator is improved, the required heat transfer area and the volume of the evaporator are reduced, the liquid preheating and evaporation can be completed in the same heat exchanger, and the cleaning and removal of the tube bundle Dirt is more convenient.

Description

An inorganic heat pipe spray evaporator

technical field

The utility model relates to an inorganic heat pipe spray evaporator, which belongs to a heat exchange device.

Background technique

Evaporators are equipment used for evaporating operations, and there are many types and structures. According to the circulation principle, it can be divided into: natural circulation evaporator, forced circulation evaporator, spray evaporator and other forms.

The existing spray evaporator is only used for heat exchange between cold and hot fluids, the outside of the tube is the side of the liquid to be evaporated, and the inside of the tube is the side of the cooling fluid. The heat transfer tube mainly adopts serpentine smooth tube or finned tube. Limited by the heat transfer performance of the heat transfer tube, the spray evaporator has a large heat transfer area and volume, and there are problems such as relatively difficult cleaning and descaling in the tube.

Utility model content

technical problem to be solved

In order to improve the heat transfer capacity of the existing spray evaporator, reduce the required heat transfer area and the volume of the evaporator, so that the liquid preheating and evaporation can be completed in the same heat exchanger, and make the cleaning and descaling of the tube bundle easier Convenient, the utility model proposes an inorganic heat pipe spray evaporator in which three fluids exchange heat at the same time. A straight-tube inorganic heat pipe with strong heat transfer capacity is used to replace the serpentine tube to make a spray evaporator. Since the working medium in the high-efficiency heat pipe is sealed and no fluid is allowed to pass through, this device changes the heat exchange method of the general cold and hot fluid partition wall, and designs a new type of evaporator that only conducts the heat transfer process on the outer surface of the tube bundle. structure.

Technical solutions

The utility model includes an ejector 1, a valve 2, a water pump 3, a pump 4, a foam catcher 5, a sprayer 6, a foam catcher 7, a sprayer 9, a shell 11, a liquid collection tank 12 and a liquid collection tank 14. It is characterized in that several inorganic heat pipes are divided into liquid preheating section tube bundle 10, heating section tube bundle 13 and liquid evaporation section tube bundle 15 by using partition board 8; several through holes are designed on the partition board 8, and the through holes The diameter is equal to the diameter of the inorganic heat pipe; the connection between the separator 8 and the inorganic heat pipe is sealed.

The length separation ratio of the liquid preheating section tube bundle 10, heating section tube bundle 13 and liquid evaporating section tube bundle 15 is equal to the ratio of the heat transfer area of the liquid preheating section, heating section and liquid evaporating section.

The number of through holes on the partition plate 8 is consistent with the number of the inorganic heat pipes.

The inorganic heat pipes are placed nearly horizontally, and the inclination angle of the tube bundle is 3-5 degrees. The tube bundle 10 end of the liquid preheating section is lower than the tube bundle 15 end of the liquid evaporation section.

Beneficial effect

The utility model adopts high-efficiency inorganic heat pipes as heat transfer tube bundles to form a spray evaporator. Compared with the existing spray evaporator, the advantages are:

(1) The heat transfer tube bundle of the evaporator is divided into three sections, namely, the liquid preheating section, the heating section and the liquid evaporation section. Liquid preheating and evaporation are completed at both ends of the same heat transfer tube bundle, without separate liquid preheaters or multi-stream heat exchangers with complex structures;

(2) The fluid heat exchange process is all carried out on the outer surface of the tube bundle, which changes the traditional partition heat transfer method and makes it more convenient to replace, clean and descale the tube bundle during the use of the evaporator;

(3) Due to the rapid axial heat conduction of the high-efficiency heat transfer tubes, each point on the tube bundle is nearly isothermal, and the total heat transfer coefficient is high. Under the same heat load, the heat transfer area is reduced by about 60% compared with the ordinary shell and tube evaporator.

(4) The tube bundle is divided into three sections, and the pressure in the space where each tube section is located can be adjusted independently according to the needs, without affecting each other. This makes the present invention more advantageous when used in low-temperature multi-effect seawater desalination devices.

Description of drawings

Figure 1: Schematic diagram of inorganic heat pipe spray evaporator

1-Ejector; 2-Valve; 3-Pump; 4-Pump; 5-Foam catcher; 6-Sprayer; 7 Fog catcher; Tube bundle of hot section; 11-shell; 12-collecting tank; 13-tube bundle of heating section; 14-collecting tank; 15-tube bundle of liquid evaporation section; A-heating fluid in; B-steam out; In; D-heating fluid out; E-pressurized sea water in; F-non-condensable gas in; G-brine in; H-non-condensable gas, brine, sea water out.

Detailed ways

Now in conjunction with accompanying drawing, the utility model is further described:

The structure of this embodiment is composed of: ejector 1, valve 2, water pump 3, pump 4, foam catcher 5, sprayer 6, foam catcher 7, partition 8, sprayer 9, liquid preheating section tube bundle 10. Housing 11, liquid collection tank 12, heating section tube bundle 13, liquid collection tank 14 and liquid evaporation section tube bundle 15.

High-efficiency inorganic heat pipe is the latest heat transfer element at present, and its principle and heat transfer effect are different from general heat pipes. Its working medium is composed of various inorganic elements, and it is obtained by pouring the working medium into the inner cavity of the tube body or sheet-like interlayer, and then sealing and vacuumizing. Its radial heat transfer capacity reaches 44kW/m ² , and its axial heat transfer capacity reaches 8600kW/m ² , which can reach and maintain isothermal temperature in a very short time. The thermal conductivity of high-efficiency inorganic heat pipes is 10,000 to 30,000 times that of silver, and the thermal conductivity of ordinary heat pipes is 300 to 1,000 times that of silver, so its thermal conductivity exceeds that of ordinary heat pipes.

In this embodiment, 16 inorganic heat pipes with a diameter of 25 mm and a length of 1 m are used to form a tube bundle. The tube bundle passes through the partition 8 and is divided into three sections by the partition. Straight-through tube holes are arranged on the partition plate in a square arrangement, and the diameter of the tube holes is the same as that of the inorganic heat pipe. The length division ratio of the tube bundle 10 in the liquid preheating section, the tube bundle 13 in the heating section and the tube bundle 15 in the liquid evaporation section is 1:2:2. The tube bundle 10 end of the liquid preheating section is lower than the tube bundle 15 end of the liquid evaporation section, and the inclination angle of the tube bundle is 4 degrees. The tube bundle space of the liquid preheating section, the tube bundle space of the heating section and the tube bundle space of the liquid evaporation section are independent and sealed.

Install and fix the combination of the liquid preheating section tube bundle 10 , the heating section tube bundle 13 and the liquid evaporating section tube bundle 15 composed of the separator 8 and the inorganic heat pipes in the casing 11 .

The working process of this evaporator is: use hot water or steam or gas or flue gas as heating fluid, enter from the upper part of the tube bundle in the middle section, and spray on the tube bundle from top to bottom through the sprayer 9 (not when heating with steam) Sprayer is required to heat the tube bundle, and the tube bundle quickly transfers heat to its left and right ends; the liquid to be evaporated first enters the tube bundle space in the preheating section of the evaporator, flows from bottom to top, and heats up after absorbing heat from the tube bundle , flows out of the evaporator, and is transported to the liquid evaporating section at the other end of the evaporator through the pipeline, and after merging with the liquid from the sump 13, it is sprayed on the tube bundle of the evaporating section through the sprayer 6, and then flows downward in the form of a thin film, Absorb the heat on the tube bundle and evaporate. The generated steam is drawn out by the pump, and the unevaporated liquid is led out from the lower part of the liquid collection tank and then pressurized to join with the liquid from the upper part of the preheating section, and re-enter the inlet of the liquid evaporation section to continue the evaporation cycle. The space pressure of each section of the tube bundle can be independently regulated as required. In the accompanying drawings, the space of the liquid evaporation section is evacuated by an ejector for low-temperature evaporation.

The device is combined with a high-efficiency inorganic heat pipe condenser and operated under negative pressure to form a new low-temperature multi-effect seawater desalination device process.

Claims (4)

1. inorganic heat pipe spray-type evaporator, comprise injector (1), valve (2), water pump (3), pump (4), mist eliminator (5), spray thrower (6), mist eliminator (7), spray thrower (9), housing (11), collecting tank (12) and collecting tank (14), it is characterized in that: utilize dividing plate (8) that several inorganic heat pipes are divided into liquid preheating section tube bank (10), bringing-up section tube bank (13) and liquid evaporator section tube bank (15); Described dividing plate (8) is gone up design some through holes, and the diameter of through hole equals the diameter of inorganic heat pipe; Described dividing plate (8) carries out encapsulation process with the junction of inorganic heat pipe.

2. inorganic heat pipe spray-type evaporator according to claim 1, it is characterized in that: the length of described liquid preheating section tube bank (10), bringing-up section tube bank (13) and liquid evaporator section tube bank (15) is separated ratio, equals the ratio of the heat transfer area of liquid preheating section, bringing-up section and liquid evaporator section.

3. inorganic heat pipe spray-type evaporator according to claim 1 and 2 is characterized in that: the number of openings on the described dividing plate (8) is consistent with the quantity of inorganic heat pipe.

4. inorganic heat pipe spray-type evaporator according to claim 1 and 2 is characterized in that: it is 3～5 degree that described inorganic heat pipe is placed as the tube bank angle of inclination, and the liquid preheating section is restrained 10 ends and is lower than liquid evaporator section tube bank (15) end.