A spiral heat medium heat exchanger

Abstract

A spiral heat medium heat exchanger includes a working medium distribution chamber, a heat exchange working chamber, a working medium collection chamber fixed on an equipment foundation, and a spiral propulsion shaft supported at both ends by support seats. A heat exchange tube bundle is arranged inside the spiral propulsion shaft. The spiral propulsion shaft sequentially passes through the working medium distribution chamber, the heat exchange working chamber, and the working medium collection chamber. The spiral propulsion shaft includes an active support section, a heat exchange working section, and a driven support section that are connected in sequence. Circular sealing plates are arranged at both ends inside the heat exchange working section, and a partition plate is arranged in the middle. The circular sealing plates and the partition plate divide the interior of the heat exchange working section into multiple segments. By using the present invention, materials can work at different relatively constant temperatures during the forward process, the blades of the spiral shaft can be effectively cooled, thereby obtaining a higher heat transfer coefficient, providing a high utilization rate of the heat transfer area, and overcoming the deficiencies or defects of existing similar heat exchangers.

Description

Technical Field

[0001] The present invention relates to a heat exchanger, and more particularly to a spiral heat medium heat exchanger. Background Art

[0002] In many industrial fields such as power, metallurgy, and chemical industries, there are heat exchange devices for heating and cooling various particulate matters such as materials, slag, ash, etc., or plastic substances such as slurry and mud. Materials, slag, ash, slurry, mud, etc. mostly belong to substances with poor fluidity. Improving the heat transfer coefficient of such heat exchange devices is of great significance for increasing the equipment capacity, improving the energy utilization efficiency, etc.

[0003] Traditional heat exchange devices mainly include rotary, bubbling bed, fluidized bed and other types. Bubbling bed and fluidized bed heat exchangers generally use gases such as air as the fluidization and heat exchange medium, and they have a relatively large heat transfer coefficient. However, in applications, there are many defects such as serious wear of the heat transfer surface, difficult fluidization, and the need for further purification of the exhaust gas, so they are less used in the market at present. Rotary heat exchangers can be further divided into drum type, screw propulsion type, disc propulsion type and other types. These rotary heat exchangers generally have defects such as small heat transfer coefficient, low effective utilization rate of the heat transfer surface, large equipment size, and small single - unit equipment capacity.

[0004] Thermal power plants have unique advantages in sludge drying and calcination. While providing heat sources of various qualities for sludge drying, they can also recover the heat generated by sludge combustion, bringing economic benefits to the power plant itself and finding a reliable way to treat sludge. In this sludge - coupled power generation technology, the sludge is dried and then mixed with boiler coal and sent into the furnace for combustion. The heat generated by combustion is absorbed by the boiler to generate steam for power generation. The solid waste generated by sludge combustion is mostly used to make building materials such as cement, realizing the transformation of sludge from waste to treasure.

[0005] Since the moisture content of sludge is as high as 60 - 80%, in order to reduce the impact of sludge on the boiler, the sludge needs to be dried first to reduce its moisture content to 30 - 40%. At present, the main sludge drying technologies are disc - type sludge drying technology and drum - type sludge drying technology. They also have defects such as small heat transfer coefficient, low effective utilization rate of the heat transfer surface, large equipment size, and small single - unit equipment capacity. At present, the maximum single - unit sludge drying treatment capacity in China is about 5t / h, and there is an urgent need to develop sludge drying equipment with a larger capacity. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a spiral heat medium heat exchanger.

[0007] The technical solution adopted by the present invention to solve its technical problems is a spiral heat medium heat exchanger, which includes a working medium distribution chamber, a heat exchange working chamber, a working medium collection chamber fixed on the equipment foundation, and a spiral propulsion shaft supported at both ends by a support seat. A heat exchange tube bundle is arranged inside the spiral propulsion shaft. The spiral propulsion shaft sequentially passes through the working medium distribution chamber, the heat exchange working chamber, and the working medium collection chamber. A feed port is arranged above the heat exchange working chamber, and a discharge port is arranged below. A working medium inlet is arranged above the working medium collection chamber, and a working medium outlet is arranged below the working medium distribution chamber;

[0008] The spiral propulsion shaft includes a driving support section, a heat exchange working section, and a driven support section connected in sequence. The driving support section and the driven support section are of solid cylinder structure, and the heat exchange working section is of hollow cylinder structure. Circular sealing plates are arranged at both ends inside the heat exchange working section, and a partition plate is arranged in the middle. The circular sealing plates and the partition plate divide the interior of the heat exchange working section into multiple sections. The two ends of the heat exchange working section are respectively a working medium collection cavity section and a working medium distribution cavity section, and the middle of the heat exchange working section is a vacuum heat exchange cavity section. Among them, the working medium collection cavity section is located inside the working medium collection chamber, the working medium distribution cavity section is located inside the working medium distribution chamber, and the vacuum heat exchange cavity section passes through the heat exchange working chamber.

[0009] The heat exchange tube bundle passes through and is fixed to the circular sealing plate and the middle partition plate of the vacuum heat exchange cavity section, so that the working medium collection cavity section is communicated with the working medium distribution cavity section; a plurality of small holes are arranged on the side wall of the working medium collection cavity section, so that the working medium collection cavity section is communicated with the working medium collection chamber.

[0010] Further, a plurality of partition plates are arranged on the partition plate to divide the middle inside the heat exchange working section into multiple small cavities, and the vacuum degrees in the multiple small cavities are different.

[0011] Further, spiral strip holes are arranged on the cylindrical surface of the vacuum heat exchange cavity section, and spiral blades are arranged in the spiral strip holes.

[0012] Further, the vacuum heat exchange cavity section is filled with an evaporable harmless liquid, and the rest is vacuum.

[0013] Further, the volume of the harmless liquid accounts for 2 / 3 of the volume inside the vacuum heat exchange cavity section.

[0014] The present invention has the following positive effects: The working state of this embodiment is similar to the heat transfer process of a heat pipe, and its heat transfer coefficient has been greatly improved compared with that of a common spiral shaft heat exchanger. By setting the number of different partition plates to control the number of small cavities in the vacuum heat exchange cavity section, and setting different vacuum degrees in the small cavities, the material works at different relatively constant temperatures during the forward process, and the blades of the spiral shaft can be effectively cooled, thereby obtaining a higher heat transfer coefficient, providing a high utilization rate of the heat exchange area, and overcoming the deficiencies or defects of existing similar heat exchangers. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0016] Figure 2 is Figure 1 a schematic diagram of the axial section of the illustrated embodiment;

[0017] Figure 3 is Figure 2 a cross-sectional view taken along line A-A in

[0018] In the figure: 1 - heat exchange working chamber, 2 - spiral propelling shaft, 3 - built-in heat exchange tube bundle, 4 - working medium distribution chamber, 5 - working medium collection chamber.

[0019] 1-1 feed inlet, 1-2 discharge outlet, 2-1 active support section, 2-2 heat exchange working section, 2-3 driven support section, 2-4 spiral blade, 2-5 circular sealing plate, 2-6 working medium collection cavity section, 2-7 vacuum heat exchange cavity section, 2-8 working medium distribution cavity section, 2-9 intermediate partition, 2-10 vacuum small cavity, 4-1 working medium outlet, 5-1 working medium inlet. Specific embodiments

[0020] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0021] Referring to the attached Figures 1 - 3 , this embodiment includes a working medium distribution chamber 4, a heat exchange working chamber 1, a working medium collection chamber 5 fixed on an equipment foundation (not shown in the figure), and a spiral propelling shaft 2 supported at both ends by support seats (not shown in the figure). A plurality of heat exchange tube bundles 3 are provided inside the spiral propelling shaft 2. The spiral propelling shaft 2 sequentially passes through the working medium distribution chamber 4, the heat exchange working chamber 1, and the working medium collection chamber 5. Sealing structures (not shown in the figure) are provided at the dynamic and static interfaces of each chamber where the spiral propelling shaft 2 passes through. One end of the spiral propelling shaft 2 is slowly rotated (at a speed of about 5 - 20 r / min) by a speed reducer (not shown in the figure) driven by a motor.

[0022] A feed inlet 1-1 is provided at the upper left of the heat exchange working chamber 1. The feed inlet 1-1 is connected to a feed hopper, and a discharge outlet 1-2 is provided at the lower right. A working medium inlet 5-1 is provided above the working medium collection chamber 5, and a working medium outlet 4-1 is provided below the working medium distribution chamber 4.

[0023] The overall shape of the spiral propulsion shaft 2 is a cylinder, including an active support section 2-1, a heat exchange working section 2-2, and a driven support section 2-3. The active support section 2-1 and the driven support section 2-3 are solid cylinder structures and are supported on the support seats. The heat exchange working section 2-2 is a hollow cylinder structure. The two ends inside the heat exchange working section 2-2 are blocked by circular blocking plates 2-5, and the middle is divided into several cavities by a partition plate 2-9. The two ends of the heat exchange working section 2-2 are respectively a working medium collection cavity section 2-6 and a working medium distribution cavity section 2-8, and the middle of the heat exchange working section 2-2 is a vacuum heat exchange cavity section 2-7. The working medium collection cavity section 2-6 is located in the working medium collection chamber 5, the working medium distribution cavity section 2-8 is located in the working medium distribution chamber 4, and the vacuum heat exchange cavity section 2-7 passes through the heat exchange working chamber 1.

[0024] On the cylindrical surface of the vacuum heat exchange cavity section 2-7 of the heat exchange working section 2-2 located in the heat exchange working chamber 1, spiral strip holes are opened, and then the opened strip holes are closed with a "J"-shaped spiral blade 2-4, jointly forming a spiral propeller. The heat exchange tube bundle 3 passes through the circular blocking plate 2-5 of the vacuum heat exchange cavity section 2-7 and several partition plates 2-9 in the middle (shown as 2 in the figure) and is welded tightly with them, dividing the vacuum heat exchange cavity section into multiple small vacuum cavities 2-10 (shown in the figure that two partition plates divide the vacuum heat exchange pipe into 3 small vacuum cavities), and enabling the working medium collection cavity section 2-6 and the working medium distribution cavity section 2-8 to be connected through the heat exchange tube bundle 3, but still not connected to the vacuum heat exchange cavity section 2-7. 3 to 6 small holes are opened on the cylindrical side wall of the working medium collection cavity section 2-6, enabling the working medium collection cavity section 2-6 to be connected to the working medium collection chamber 5.

[0025] Each small vacuum cavity 2-10 inside the vacuum heat exchange cavity section 2-7 is filled with water or other harmless evaporable liquids, and the internal air is expelled and evacuated, and it is sealed tightly after evacuation to maintain the vacuum. The volume of the liquid accounts for about 2 / 3 of the volume inside the vacuum heat exchange cavity section.

[0026] Preferably, each different small vacuum cavity 2-10 divided by the partition plate 2-9 can be evacuated to different vacuum degrees.

[0027] When the heat exchanger in this embodiment is used as a heater, the material enters from the feed port 1-1 under the action of the spiral propulsion shaft 2, moves from left to right, and finally exits from the discharge port 1-2. During the movement of the material, it absorbs the heat of the medium liquid and gas medium inside the spiral shaft 2, and the material is heated. In this process, the medium liquid is cooled, and part of the gas medium condenses into a liquid. At the same time, the heat carrier enters the working medium distribution chamber 4 from the working medium inlet 5-1, passes through the heat exchange tube bundle 3 inside the spiral propulsion shaft 2, transfers the heat to the medium liquid, the medium liquid is heated and evaporated, the working medium is cooled down, and finally gathers in the working medium collection chamber 5. Finally, the heat for heating the working medium is transferred to the working medium to be heated.

[0028] When the heat exchanger is used as a cooler in this embodiment, the direction of heat transfer and the phase change of the medium are reversed.

[0029] In this embodiment, the working state of the heat exchanger is similar to the heat transfer process of a heat pipe. Its heat transfer coefficient has been greatly improved compared with that of a common spiral shaft heat exchanger. By controlling the number of small chambers in the vacuum heat exchange section and the different vacuum degrees in the small chambers, the material works at different relatively constant temperatures during the forward process, and the blades of the spiral shaft can be effectively cooled. This makes the heat exchanger have a high heat transfer coefficient and a high utilization rate of the heat transfer area, overcoming the deficiencies or defects of existing similar heat exchangers.

[0030] Those skilled in the art can make various modifications and variations to the present invention. If these modifications and variations are within the scope of the claims of the present invention and their equivalent technologies, then these modifications and variations are still within the protection scope of the present invention patent.

[0031] The content not described in detail in the specification is the prior art well known to those skilled in the art.

Claims

1. A spiral heat medium heat exchanger, comprising a working medium distribution chamber, a heat exchange working chamber, a working medium collection chamber fixed on an equipment foundation, and a spiral propulsion shaft supported at both ends by a support seat, characterized in that: The interior of the spiral propelling shaft is provided with a heat exchange tube bundle. The spiral propelling shaft sequentially passes through the working medium distribution chamber, the heat exchange working chamber, and the working medium collection chamber. An inlet is arranged above the heat exchange working chamber, and an outlet is arranged below it. A working medium inlet is arranged above the working medium collection chamber, and a working medium outlet is arranged below the working medium distribution chamber; The spiral propelling shaft comprises a driving support section, a heat exchange working section, and a driven support section that are connected in sequence. The driving support section and the driven support section are of solid cylinder structures, and the heat exchange working section is of a hollow cylinder structure. Circular sealing plates are arranged at both ends inside the heat exchange working section, and a partition plate is arranged in the middle. The circular sealing plates and the partition plate divide the interior of the heat exchange working section into multiple segments. The two ends of the heat exchange working section are respectively a working medium collection cavity section and a working medium distribution cavity section, and the middle of the heat exchange working section is a vacuum heat exchange cavity section. Among them, the working medium collection cavity section is located in the working medium collection chamber, the working medium distribution cavity section is located in the working medium distribution chamber, and the vacuum heat exchange cavity section passes through the heat exchange working chamber; The heat exchange tube bundle passes through and is fixed to the circular sealing plates and the middle partition plate of the vacuum heat exchange cavity section, so that the working medium collection cavity section is communicated with the working medium distribution cavity section; A plurality of small holes are arranged on the side wall of the working medium collection cavity section, so that the working medium collection cavity section is communicated with the working medium collection chamber.

2. The spiral heat medium heat exchanger according to claim 1, wherein: A plurality of partition plates are provided, dividing the middle of the interior of the heat exchange working section into multiple small cavities, and the vacuum degrees in the multiple small cavities are different.

3. The spiral heat medium heat exchanger according to claim 1, characterized in that: Spiral strip holes are arranged on the cylindrical surface of the vacuum heat exchange cavity section, and spiral blades are arranged in the spiral strip holes.

4. The spiral heat medium heat exchanger according to claim 1, characterized in that: The vacuum heat exchange cavity section is filled with an evaporable harmless liquid, and the rest is vacuum.

5. The spiral heat medium heat exchanger according to claim 4, wherein: The volume of the harmless liquid accounts for 2 / 3 of the volume inside the vacuum heat exchange cavity section.

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