CN-116481368-B - Direct contact type heat exchanger

Abstract

The invention provides a direct contact type heat exchanger which comprises a heat exchange cavity, a liquid collecting box and a liquid supply box, wherein the liquid collecting box is arranged at the bottom of the heat exchange cavity, a liquid pump is arranged in the liquid supply box, an air inlet is formed in the lower part of one side of the heat exchange cavity, an air outlet is formed in the top of the heat exchange cavity, a plurality of heat exchange mechanisms are arranged in the heat exchange cavity and divide the heat exchange cavity into communicated multi-stage heat exchange channels, an inlet of the first-stage heat exchange channel is communicated with the air inlet, an outlet of the last-stage heat exchange channel is communicated with the air outlet, the tail end of the heat exchange mechanism is communicated with the liquid collecting box, a spray head is arranged on the heat exchange mechanism, and the spray head is communicated with the liquid pump. According to the invention, the multistage heat exchange channels are arranged in the heat exchange cavity, so that the length of the gas path and the time for contacting with cold liquid are prolonged, the equipment volume is reduced, and the cold liquid is at the lowest temperature when gas in the heat exchange channels contacts with the cold liquid sprayed by each spray head, so that the temperature difference of the gas in the heat exchange channels is always kept maximized when the gas contacts with the cold liquid, and the heat exchange efficiency is effectively improved.

Inventors

• Qiao Manman

Assignees

• 南通大学

Dates

Publication Date

20260512

Application Date

20230424

Claims (6)

1. 1. The direct contact type heat exchanger is characterized by comprising a heat exchange cavity, a liquid collecting box and a liquid supply box, wherein the liquid collecting box is arranged at the bottom of the heat exchange cavity, a liquid pump is arranged in the liquid supply box, an air inlet is arranged at the lower part of one side of the heat exchange cavity, and an air outlet is arranged at the top of the heat exchange cavity; a plurality of heat exchange mechanisms are arranged in the heat exchange cavity, the heat exchange mechanisms divide the heat exchange cavity into a plurality of communicated multi-stage heat exchange channels, an inlet of a first-stage heat exchange channel is communicated with the air inlet, and an outlet of a last-stage heat exchange channel is communicated with the air outlet; the tail end of the heat exchange mechanism is communicated with the liquid collection box, a spray head is arranged on the heat exchange mechanism, the spray head is arranged at the top of the baffle plate and faces upwards, and the spray head is communicated with the liquid pump; the heat exchange mechanism comprises a baffle plate arranged on the inner wall of the heat exchange cavity, wherein a converging groove is obliquely arranged at the top of the baffle plate, and a converging port is arranged at the tail end of the converging groove; In the spray heads arranged on each baffle plate, the spray heads far away from the flow converging port are arranged towards the communication ports of the adjacent two-stage heat exchange channels, the front side, the rear side and the left end or the right end of each baffle plate are respectively in contact with the inner wall of the heat exchange cavity, and the rest right end or left end and the inner wall of the heat exchange cavity form a communication port between the adjacent baffle plates, namely the communication ports of the two-stage heat exchange channels.
2. 2. The direct contact heat exchanger according to claim 1, wherein the baffle plate and the heat exchange cavity are provided with liquid supply pipelines in the interior thereof, and the liquid supply pipelines are communicated with the liquid pump and the spray head.
3. 3. The direct contact heat exchanger of claim 1, wherein a plurality of spray heads are provided on each baffle plate, the plurality of spray heads being disposed at different obliquely upward angular intervals.
4. 4. The direct contact heat exchanger of claim 1, wherein a plurality of heat exchange cavities are arranged in parallel.
5. 5. The direct contact heat exchanger according to claim 1, wherein the direct contact heat exchanger comprises a gas collecting hood, one end of the gas collecting hood is provided with a gas collecting port, and the other end of the gas collecting hood is provided with an opening which is respectively communicated with the gas inlets of the plurality of heat exchange cavities.
6. 6. The direct contact heat exchanger according to claim 1, wherein a liquid outlet is formed in the lower portion of the liquid collecting tank, and a liquid inlet is formed in the liquid supplying tank.

Description

Direct contact type heat exchanger Technical Field The invention relates to the field of heat exchangers, in particular to a direct contact type heat exchanger. Background Heat exchangers, also known as heat exchangers or heat exchange devices, are devices used to transfer heat from a hot fluid to a cold fluid to meet specified process requirements, and are an industrial application of convective heat transfer and thermal conduction. The direct contact heat exchanger, also called a hybrid heat exchanger, is a device for carrying out heat exchange by directly contacting cold and hot fluid. It is generally seen that one fluid is a gas and the other fluid is a liquid with a lower vaporization pressure and is easily separated after heat exchange. Compared with the dividing wall type heat exchanger, the direct contact type heat exchanger has the advantages of small corrosion, no scaling, high heat exchange efficiency, small heat transfer temperature difference, small pressure drop, low investment cost and the like, and has obvious defects, such as the requirement that two mediums are mutually insoluble and mutually non-reactive due to direct contact, otherwise pollution is caused. The existing direct contact heat exchanger generally adopts a mode that a plurality of spray heads are arranged in a heat exchange cavity, a cooling fluid medium such as water and the like is sprayed from a high position and falls downwards, and gas flows upwards from the lower part and exchanges heat. However, the cooling fluid medium falling from a high place is high in lower temperature and low in upper temperature of the cooling fluid medium sprayed from the high place when the gas contacts the cooling fluid medium at the lower part, so that the maximization of the temperature difference cannot be maintained, and the heat exchange efficiency is relatively low. And because the gas flows fast, in order to ensure the heat exchange effect, the heat exchange cavity is generally larger in volume and occupies larger space, the gas flows unevenly distributed, the cooling fluid medium at part of the positions can not or less contact the gas, and the heat exchange utilization rate of the cooling fluid medium is lower. Disclosure of Invention In order to solve the problems existing in the background technology, the invention provides a direct contact type heat exchanger. A direct contact type heat exchanger comprises a heat exchange cavity, a liquid collecting box and a liquid supply box, wherein the liquid collecting box is arranged at the bottom of the heat exchange cavity, a liquid pump is arranged in the liquid supply box, an air inlet is formed in the lower portion of one side of the heat exchange cavity, an air outlet is formed in the top of the heat exchange cavity, a plurality of heat exchange mechanisms are arranged in the heat exchange cavity and divide the heat exchange cavity into communicated multi-stage heat exchange channels, an inlet of the first-stage heat exchange channel is communicated with the air inlet, an outlet of the last-stage heat exchange channel is communicated with the air outlet, the tail end of the heat exchange mechanism is communicated with the liquid collecting box, a spray head is arranged on the heat exchange mechanism, and the spray head is communicated with the liquid pump. Based on the above, the heat exchange mechanism comprises a baffle plate arranged on the inner wall of the heat exchange cavity, wherein the top of the baffle plate is obliquely provided with a converging groove, the tail end of the converging groove is provided with a converging port, a converging pipeline is arranged in the inner wall of the heat exchange cavity, one end of the converging pipeline is communicated with the converging port, and the other end of the converging pipeline is communicated with the liquid collecting box. Based on the above, the spray head is arranged at the top of the baffle plate and faces upwards, and liquid supply pipelines are correspondingly arranged in the baffle plate and the heat exchange cavity and are communicated with the liquid pump and the spray head. Based on the above, each baffle plate is provided with a plurality of spray heads, and the spray heads are arranged at different oblique upward angle intervals. Based on the above, among the spray heads arranged on each baffle plate, the spray heads far away from the flow converging port are arranged towards the communication ports of the adjacent two-stage heat exchange channels. Based on the above, the heat exchange cavities are multiple, and the heat exchange cavities are arranged in parallel. Based on the above, including the gas collecting channel, the one end of gas collecting channel is provided with the gas collecting port, and the uncovered of the other end of gas collecting channel communicates a plurality of respectively the air inlet of heat transfer cavity. Based on the above, the lower part of the liquid collecting box is provided wi