CN102865753B - A kind of spraying mass transfer formula condenser - Google Patents

Abstract

The invention discloses a spray mass transfer condenser, which comprises a plurality of finned condenser tubes distributed in a ring shape, a water collecting pan and a fan arranged under the finned condenser tubes, and the upper part of the finned condenser tubes is connected to There is a secondary steam main pipe, and a plurality of annularly distributed finned condensation pipes are provided with annularly distributed spray pipes, and the spray pipes are provided with atomizing nozzles. The spray mass transfer condenser of the present invention atomizes water through the atomizing nozzle, sprays it onto the surface of the finned condenser tube to absorb heat and evaporate it. This convective heat transfer with phase change greatly improves the heat exchange coefficient and greatly saves condensation energy. In addition, the secondary steam header is located above the finned condensing tube, so that the high-speed steam is in the same direction as the condensed water, which can effectively prevent the condensation of the inner film of the tube and improve the heat transfer coefficient.

Description

A spray mass transfer condenser

technical field

The invention belongs to a condensation device, in particular to a spray mass transfer condenser of a vacuum concentration device.

Background technique

At present, the condensing part of domestic vacuum concentration equipment generally adopts tube condensers, mixers or hydraulic ejectors. All methods use single-phase fluid heat transfer with cooling water as the heat carrier, that is, the cooling water does not undergo phase change during the cooling process, the amount of water transported during the condensation process is large, the power of the circulating pump is large, and all The form must be equipped with a cooling tower, and the water cooled by the cooling tower is sent to the condenser again. The characteristics of traditional condensers in various ways are: large footprint, large water transportation volume, high energy consumption, poor vacuum effect, etc.

Contents of the invention

The object of the present invention is to provide a spray mass transfer type condenser, which can not only save energy consumption of condensation, but also effectively prevent the condensation of the tube inner film and improve the heat transfer coefficient.

In order to achieve the above object, the present invention provides a spray mass transfer condenser, which includes a plurality of finned condenser tubes distributed in an annular shape, a water collection tray and a fan arranged under the finned condenser tubes, and the finned condenser tubes A secondary steam main pipe is connected above the pipe, and a plurality of circularly distributed finned condensation pipes are provided with circularly distributed spray pipes, and the spray pipes are provided with atomizing nozzles.

Compared with the prior art, the spray mass transfer condenser of the present invention atomizes and sprays water onto the surface of the finned condenser tube through the atomizing nozzle, which can absorb the heat on the surface of the finned condenser tube and evaporate, atomize, absorb heat and Evaporation, a heat exchange process with phase change, uses the principle that the latent heat of vaporization when water evaporates is several times or even dozens of times larger than the heat transfer coefficient of sensible heat when cooling water is used for heat exchange, which greatly saves energy consumption for condensation; in addition, The secondary steam main pipe is located above the finned condensation pipe, so that the direction of the high-speed steam and the condensed water are consistent, thereby effectively preventing the condensation of the inner film of the pipe and improving the heat transfer coefficient; the actual test shows that the present invention uses water injection compared with single-effect concentration The pump can save 73.55% of energy consumption.

The present invention will become clearer through the following description in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention.

Description of drawings

Fig. 1 is a schematic diagram of the working principle of the spray mass transfer condenser of the present invention.

Figure 2 is a schematic diagram of the air distribution ring.

Fig. 3 is a schematic diagram of the cyclone vane inside the finned tube.

Detailed ways

Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements.

Please refer to Figures 1-3, the spray mass transfer condenser includes a secondary steam main pipe 1, a secondary steam distribution pipe 2, an upper ring 3, and a plurality of finned condenser pipes 4 arranged vertically and connected in a ring , middle ring 5, inclined pipe 6, bottom ring 7, circular spray pipe 8, atomizing nozzle 9, protective net 10, fan 11, air distributor 12, spray pump 13, water collecting tray 14, steam Liquid separator 15, support feet 16, water ring pump 17, shell 18 and top cover 19.

The secondary steam distribution pipe 2 is connected to the secondary steam main pipe 1; the upper ring 3 is connected to the secondary steam distribution pipe 2; 4 is connected to the upper ring 3; the middle ring 5 is connected to the finned condensation pipe 4; the slanted tube 6 is connected to the middle ring 5; the bottom ring 7 is connected to the slanted tube 6; the bottom ring 7 surrounds the outside of the spray pipe 8 distributed in a ring; the atomizing nozzle 9 is arranged on the spray pipe 8; the protective net 10, the fan 11 and the air distributor 12 are arranged in the spray pipe distributed in a ring 8, and the protective net 10, fan 11 and air distributor 12 are arranged sequentially from bottom to top, and the fan 11 is located below the atomizing nozzle 9; the spray pump 13 is located in a circular distribution The bottom of the spray pipe 8 is connected to the spray pipe 8 to supply water to the atomizing nozzle 9; The outer side of the spray pipe 8, the vapor-liquid separator 15 is connected to the bottom ring 7 and the middle ring 5; The bottom is provided with the support feet 16 and the water ring pump 17 ; the top cover 19 covers the secondary steam distribution pipe 2 .

Specifically, the finned condenser tube 4 includes a heat exchange tube 4a, fins surrounding the outer surface of the heat exchange tube 4a, metal thin rods 4b and a plurality of fan blades 4c arranged inside the heat exchange tube. The metal thin rod 4b is a stainless steel thin rod. The plurality of fan blades 4c are arranged on the inner upper part of the heat exchange tube 4a, and the plurality of fan blades 4c are arranged in series on the thin metal rod 4b at equal intervals, and the fan blades 4c are welded on the The metal thin rod 4b, and the diameter of the fan blade 4c is the same as the inner diameter of the heat exchange tube 4a.

The air distributor 12 acts as a guide, and can evenly cut the vertically upward wind into multiple equal parts and blow it horizontally onto the ring-shaped vertical fin condenser tube 4 . In this embodiment, the air distributor 12 is composed of six layers of air distribution rings 12a placed equidistantly in the vertical direction, and the diameter of the six layers of air distribution rings 12a gradually increases from top to bottom to form a trapezoidal structure , among the six layers of air distribution rings 12a, the wind-shielding area of each layer of air distribution rings 12a is 1/6 of the ventilation area of the fan. Each of the air distribution rings 12a is provided with a ventilation hole 12b facing the secondary steam main pipe 1, and the diameters of the ventilation holes 12b of the six-layer air distribution rings 12a increase sequentially from top to bottom. Atomizing nozzles arranged on the spray pipes are arranged on the outside between two adjacent air distribution rings.

When in use, the secondary steam enters the secondary steam distribution pipe 2 from the secondary steam main pipe 1, and enters the fin condensing pipe through the secondary steam distribution pipe 2 and the upper ring 3 Tube 4, when the secondary steam enters the finned condenser tube 4 and passes through the fan blades 4c, the secondary steam can be attached to the heat exchange tube 4a through the action of the plurality of fan blades 4c The inner wall of the tube rotates at a high speed, and since the direction of the condensed water and the high-speed steam is the same, no film condensation is formed, and the newly formed condensed water is quickly blown away from the tube wall, thereby greatly increasing the heat transfer coefficient and further accelerating the condensation speed, and the secondary steam After becoming condensed water in the finned condenser tube 4, it enters the middle ring 5 or the inclined pipe 6 and the bottom ring 7, and then flows through the middle ring 5 and the bottom ring 7 The vapor-liquid separator 13 flows out of the spray mass transfer condenser after passing through the vapor-liquid separator 13; when the secondary steam enters the secondary steam distribution pipe 2, the spray pump 13 starts , pump the water in the water collecting tray 14 to the spray pipe 8, and make the atomizing nozzle 9 of the spray pipe 8 spray against the surface of the fin condenser pipe 4, so that the fin The secondary steam in the condensing pipe 4 is condensed, and the water that falls after the atomizing nozzle 9 is sprayed on the surface of the finned condensing pipe 4 directly falls in the water collecting pan 14; and when the spray pump 13 is started At the same time, the fan 11 is also started at the same time. When the wind blown by the fan 11 passes through the air distributor 12, through the guiding effect of the air distributor 12, the six-layer air distribution ring of the air distributor 12 12a decomposes the wind blown by the fan 10 into six equal parts, and blows the water atomized by the atomizing nozzle 9 to the surface of the fin condenser tube 4, because the surface area of the water drops is greatly increased after atomization, so that all The above-mentioned fin condenser tube 4 obtains a better cooling effect. Part of the water sprayed on the fin condenser tube 4 evaporates after absorbing heat, and the remaining water flows back to the water collecting pan 14, and is pumped into the spray tube 8 by the spray pump 13 for reuse. This is a heat exchange process with phase change in which water is atomized and sprayed to the surface of the finned condenser tube 4 through the atomizing nozzle 9, and can absorb heat and evaporate on the surface of the finned condenser tube 4. The latent heat of vaporization during evaporation is several times or even dozens of times larger than the heat transfer coefficient of sensible heat during heat exchange with cooling water, which greatly saves the energy consumption of condensation. Compared with the tube condenser, it can save energy consumption by 73.72%. The first generation of high-efficiency evaporative coolers (as disclosed in patent No. CN200810127664.9) save energy consumption by 20%.

The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the above-disclosed embodiments, but should cover various modifications and equivalent combinations made according to the essence of the present invention.

Claims (6)

1. A spray mass transfer condenser, comprising a blower fan, a plurality of finned condenser tubes in an annular distribution, a water collection tray located below the finned condenser tubes, characterized in that: the finned condenser tubes The upper part is connected with the secondary steam main pipe, and the interior of the circularly distributed finned condensation pipes is provided with circularly distributed spray pipes, and the spray pipes are equipped with atomizing nozzles, and the fans are located The inside of the shower pipe is located below the atomizing nozzle, and the inside of the circularly distributed spray pipe is also provided with an air distributor between the fan and the secondary steam main pipe. The air distributor is It is composed of multi-layer air distribution rings placed equidistantly in the vertical direction. The diameter of the multi-layer air distribution rings gradually increases from top to bottom to form a trapezoidal structure. The ventilation holes of the secondary steam main pipe, the finned tubes include heat exchange tubes, fins surrounding the outer surface of the heat exchange tubes, thin metal rods and a plurality of fan blades welded on the thin metal rods, the A thin metal rod is arranged inside the heat exchange tube, and the plurality of fan blades are arranged in series on the thin metal rod at intervals. 2. The spray mass transfer condenser according to claim 1, characterized in that: the upper end of the finned condenser tube is connected with an upper ring, and a secondary steam pipe is connected between the upper ring and the secondary steam main pipe. A steam distribution pipe, the lower end of the finned condensation pipe is connected to a middle ring, the middle ring is connected to an inclined pipe, the inclined pipe is connected to a bottom ring, and the bottom ring surrounds the outer side of the circularly distributed spray pipes, A spray pump is connected to the bottom of the spray pipe. 3. The spray mass transfer condenser according to claim 1, characterized in that: the diameters of the ventilation holes of the multi-layer air distribution ring increase sequentially from top to bottom. 4. The spray mass transfer condenser according to claim 1, characterized in that: the multi-layer air distribution ring has six layers, and the wind-shielding area of each layer of air distribution ring is 1/6 of the ventilation area of the fan . 5. The spray mass transfer condenser according to claim 1, characterized in that: the plurality of fan blades are arranged at equal intervals. 6. The spray mass transfer condenser according to claim 1, characterized in that: the diameter of the fan blade is the same as the inner diameter of the heat exchange tube.