Sensitive medium heating device

Abstract

A sensitive medium heating device mainly comprises a solid electric heat storage furnace, a first heat exchanger and a second heat exchanger. The solid electric heat storage furnace is equipment which converts electric energy into heat energy and effectively stores and orderly releases the heat energy, the heat energy in the solid electric heat storage furnace enters a first heat exchanger through a high-temperature air output port by taking hot air as a carrier, and the heat energy is circulated back to the solid electric heat storage furnace through a low-temperature air input port after being subjected to heat energy exchange with water in a tube pass; hot air is formed again; the first heat exchanger generally adopts a fin heat exchange tube structural form, and heat exchange is carried out on hot air of the solid electric heat storage furnace and water; the second heat exchanger is in a pressure container structural form, high-temperature water and water vapor are stored in the second heat exchanger, a spiral heat exchange pipe is arranged in the second heat exchanger, a low-temperature sensitive medium circulates in the spiral heat exchange pipe, and the low-temperature sensitive medium flows in through a second heat exchange input port and absorbs heat energy of the water and the water vapor to form a high-temperature sensitive medium which flows out from a second heat exchange output port.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology for solid electric thermal storage furnaces, specifically a sensitive medium heating device. Background Technology

[0002] Currently, some sensitive media requiring heating in specialized equipment applications are sensitive to either pressure or temperature. For example, waterjet cutting machines can withstand pressures ranging from 220 MPa to 600 MPa. Water at room temperature (around 25°C) may require heating to over 200°C in certain processing procedures. The temperature of metal pipes bearing this pressure significantly impacts their pressure resistance. In heat transfer oil heating equipment, flames or hot air at temperatures more than twice the circulating temperature of the heat transfer oil are typically used. Since the heated heat transfer oil is a flammable and explosive medium, such equipment using flames or high-temperature hot air is not suitable for installation in locations with high fire safety requirements. The device for heating sensitive media with hot air is equipped with a heating chamber and a spiral pipe for introducing the sensitive media inside the heating chamber. During operation, high-temperature hot air is introduced into the heating chamber. Due to the low energy density of the hot air, the heat absorption power per square centimeter of the outer surface of the spiral pipe inside the heating chamber is less than 0.3W. Therefore, a longer spiral pipe must be used inside the heating chamber to improve the heating capacity of the hot air; otherwise, it may be difficult to heat the high-pressure medium to above 200°C. Secondly, this type of heating device requires the direct introduction of hot air at 300°C to 600°C to achieve heat exchange of the sensitive media. However, the continuous introduction of high-temperature hot air into the heating chamber will reduce the pressure resistance of the spiral pipe wall, causing safety accidents such as pipe rupture, or cause carbon buildup on the wall of the spiral pipe carrying heat transfer oil, damaging the thermal conductivity of the spiral pipe. Summary of the Invention

[0003] In view of the above-mentioned technical requirements, the purpose of this utility model is to provide a sensitive medium heating device, which aims to solve the problem that in existing sensitive medium heating devices, directly introducing hot air into the heating chamber will reduce the pressure resistance of the pipe wall and cause safety accidents such as pipe rupture, or cause carbon buildup on the pipe wall of the spiral pipeline carrying heat transfer oil, which will damage the thermal conductivity of the spiral pipeline and result in low heating safety.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A sensitive medium heating device includes a solid electric thermal storage furnace, a first heat exchanger, and a second heat exchanger;

[0006] The solid-state electric thermal storage furnace is connected to the first heat exchanger through a high-temperature air outlet and a low-temperature air inlet.

[0007] The first heat exchanger has heat exchange tubes inside, and the heat exchange tubes are connected to the second heat exchanger through the first heat exchange outlet and the first heat exchange inlet.

[0008] The second heat exchanger is equipped with a second heat exchange outlet and a second heat exchange inlet. The second heat exchanger contains high-temperature water and water vapor, and a spiral heat exchange tube is installed inside the second heat exchanger. The lower end of the spiral heat exchange tube is connected to the second heat exchange inlet, and the upper end of the spiral heat exchange tube is connected to the second heat exchange outlet. Low-temperature sensitive medium is introduced into the spiral heat exchange tube through the second heat exchange inlet, and high-temperature sensitive medium is output through the second heat exchange outlet.

[0009] Furthermore, the first heat exchanger adopts a finned heat exchange tube structure, with both ends of the finned heat exchange tube connected to the first heat exchange output port and the first heat exchange input port.

[0010] Furthermore, the second heat exchanger is equipped with a pressure relief valve.

[0011] Furthermore, the second heat exchanger is also equipped with a pressure sensor and a temperature sensor.

[0012] The technical solution adopted in this utility model has the following advantages:

[0013] A two-stage heat exchange technology is adopted. The first-stage heat exchanger generates high-temperature water and steam, and the second-stage heat exchanger then uses the heat energy of the high-temperature water and steam to heat the sensitive medium. Since the water in the second-stage heat exchanger exists in both liquid and vapor states, its internal energy is large enough to heat the sensitive medium to the required temperature through a short-channel pipeline. The two-stage heat exchange technology avoids direct contact between the spiral heat exchange tubes and the high-temperature hot air output from the solid electric thermal storage furnace, preventing the high-temperature hot air from causing the spiral heat exchange tubes to operate at temperatures exceeding 400°C, which could lead to a decrease in the tube wall's pressure resistance and a tube rupture safety accident. The first heat exchanger of this technology can convert the hot air with a large temperature difference and low energy density (300℃ to 500℃) output from the solid-state electric thermal storage furnace into water and saturated steam with a pressure of less than 10MPa and a temperature of less than 310℃, which is then stored in the second heat exchanger. Compared with the hot air output from the solid-state electric thermal storage furnace, the water and steam are exothermic media with high energy density and high heat transfer capacity. The second heat exchanger then heats the sensitive medium through the thermal energy of the high-temperature water and steam. Since the water in the second heat exchanger exists in both liquid and vapor states, its internal energy is large enough that the heat absorption power per square centimeter of the outer surface of the spiral heat exchange tube is greater than 4W. This indicates that the heat absorption capacity of the spiral heat exchange tube in liquid and vapor water at the same temperature is more than 10 times higher than that in hot air at the same temperature. The heating temperature required by the sensitive medium can be obtained with a shorter spiral heat exchange tube length. Attached Figure Description

[0014] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0015] Figure 1 This is a schematic diagram of the present invention;

[0016] Explanation of icon numbers:

[0017] 1. Solid-state electric thermal storage furnace; 1-1. High-temperature air outlet; 1-2. Low-temperature air inlet; 2. First heat exchanger; 2-1. First heat exchange outlet; 2-2. First heat exchange inlet; 2-3. Finned heat exchange tube; 3. Second heat exchanger; 3-1. Second heat exchange outlet; 3-2. Second heat exchange inlet; 3-3. Pressure safety valve; 3-4. Pressure sensor; 3-5. Temperature sensor; 3-6. High-temperature water; 3-7. Steam; 3-8. Spiral heat exchange tube; 4. Low-temperature sensitive medium; 5. High-temperature sensitive medium. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Unless otherwise specified, the techniques used in the embodiments are conventional means well known to those skilled in the art.

[0019] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should be understood in their ordinary sense by those skilled in the art to which this invention pertains. In this document, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms “connection”, “linked,” etc., should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium. The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase “comprising…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0020] This technical solution discloses a sensitive medium heating device, mainly comprising a solid-state electric thermal storage furnace 1, a first heat exchanger 2, and a second heat exchanger 3. The solid-state electric thermal storage furnace 1 is connected to the first heat exchanger 2 through a high-temperature air outlet 1-1 and a low-temperature air inlet 1-2. The first heat exchanger 2 is connected to the second heat exchanger 3 through a first heat exchange outlet 2-1 and a first heat exchange inlet 2-2. The second heat exchanger 3 is equipped with a second heat exchange outlet 3-1, a second heat exchange inlet 3-2, a pressure safety valve 3-3, a pressure sensor 3-4, and a temperature sensor 3-5. It contains a spiral heat exchange tube 3-8 and stores a high-temperature water medium 3-6 and a steam medium 3-7. The pressure safety valve 3-3 protects the second heat exchanger 3 from excessive internal pressure. The pressure sensor 3-4 and the temperature sensor 3-5 are detection devices for the operating status of the second heat exchanger 3.

[0021] This embodiment describes an ultra-high pressure cryogenic medium heating device, such as... Figure 1 As shown, the solid electric thermal storage furnace 1 is a device that converts electrical energy into thermal energy and effectively stores and releases the thermal energy in an orderly manner. The thermal energy inside is carried by hot air and enters the first heat exchanger 2 through the high-temperature air outlet 1-1. After exchanging thermal energy with the low-pressure high-temperature medium in its tube side, it is circulated back into the solid electric thermal storage furnace 1 through the low-temperature air inlet 1-2 to form hot air again.

[0022] The first heat exchanger 2 generally adopts a finned heat exchange tube 2-3 structure to exchange heat between the hot air and water medium of the solid electric thermal storage furnace 1. The second heat exchanger 3 is a closed pressure vessel structure with no steam outlet, where vapor and liquid coexist, arranged above the first heat exchanger. The first heat exchanger 2 and the second heat exchanger 3 transfer heat energy through natural circulation or forced circulation. It contains a high-temperature water medium 3-6 and a steam medium 3-7, and is equipped with a spiral heat exchange tube 3-8. A sensitive medium flows inside the spiral heat exchange tube 3-8. The low-temperature sensitive medium 4 flows into the second heat exchanger 3 through the second heat exchange inlet 3-2, absorbs the heat energy of the high-temperature water medium 3-6 and the steam medium 3-7, and forms a high-temperature sensitive medium 5, which flows out from the second heat exchange outlet 3-1.

[0023] This invention employs a two-stage heat exchange technology to prevent the spiral heat exchange tubes 3-8 from directly contacting the high-temperature hot air output from the solid electric thermal storage furnace 1. This prevents the high-temperature hot air from causing the working temperature of the spiral heat exchange tubes to exceed 400°C, which could lead to a decrease in the tube wall's pressure resistance and a tube rupture safety accident. The first heat exchanger 2 of this technology can convert the hot air with a large temperature difference and low energy density (300℃ to 500℃) output from the solid-state electric thermal storage furnace 1 into water and saturated steam with a pressure of less than 10MPa and a temperature of less than 310℃, which is then stored in the second heat exchanger 3 as a heat release medium. Compared with the hot air output from the solid-state electric thermal storage furnace 1, the heat release medium in the second heat exchanger 3 has a high energy density and high heat transfer capacity. The second heat exchanger 3 then heats the low-temperature sensitive medium 4 through the heat energy of the high-temperature water medium 3-6 and the steam medium 3-7. Since the high-temperature water medium 3-6 and the steam medium 3-7 in the second heat exchanger 3 exist in both liquid and vapor states, their internal energy is large enough that the heat absorption capacity of the spiral heat exchange tube 3-8 per unit length of liquid and vapor heat release medium at the same temperature is more than 10 times higher than that of the hot air heat release medium at the same temperature. The temperature required by the high-pressure medium can be obtained through a shorter spiral heat exchange tube 3-8.

[0024] In use, if the user needs to heat the high-pressure low-temperature sensitive medium 4 (pressure 500MPa, temperature 25℃, flow rate 0.5 cubic meters per hour) into the high-pressure high-temperature sensitive medium 5 (pressure 500MPa, temperature 220℃, flow rate 0.5 cubic meters per hour), a solid-state electric thermal storage furnace 1 with a heat output capacity of 100kW should be selected as the heat source. It outputs hot air with a large temperature difference of 300℃ to 500℃ and low energy density to heat the water in the first heat exchanger 2, so that water and saturated steam with a pressure of 8.6 MPa and a temperature of 300℃ are generated in the second heat exchanger 3. This heats the low-temperature sensitive medium 4 into the high-temperature sensitive medium 5. This not only satisfies the requirement of using a shorter spiral heat exchange tube 3-8 to complete the heating process of the sensitive medium, but also avoids the spiral heat exchange tube 3-8 from exceeding the working temperature, reducing its pressure resistance and causing a tube rupture accident, thus improving the reliability of the sensitive medium heat exchange system structure.

[0025] This technical solution uses a solid-state electric thermal storage furnace 1 as a heat source. It can utilize off-peak electricity from the power grid or inexpensive electricity such as surplus wind and solar power to power the furnace, reducing electricity costs. If the high-temperature sensitive medium 5 does not require continuous output or a high-power narrow pulse output, the thermal storage capacity of the solid-state electric thermal storage furnace 1 can be several times less than the heat absorption capacity of the spiral heat exchange tubes 3-8 in the second heat exchanger 3, reducing the power capacity requirements for heating the low-temperature sensitive medium 4 into the high-temperature sensitive medium 5. If the user has sufficient power capacity, and electricity costs are not a concern, or to reduce the equipment footprint, the equipment structure can be simplified by placing an electric heater inside the second heat exchanger 3 to heat and vaporize the water within, thus achieving the purpose of heating the low-temperature sensitive medium 4 into the high-temperature sensitive medium 5.

[0026] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A sensitive medium heating device, characterized in that, It includes a solid-state electric thermal storage furnace, a first heat exchanger, and a second heat exchanger; The solid-state electric thermal storage furnace is connected to the first heat exchanger through a high-temperature air outlet and a low-temperature air inlet. The first heat exchanger has heat exchange tubes inside, and the heat exchange tubes are connected to the second heat exchanger through the first heat exchange outlet and the first heat exchange inlet. The second heat exchanger is equipped with a second heat exchange outlet and a second heat exchange inlet. The second heat exchanger contains high-temperature water and water vapor, and a spiral heat exchange tube is installed inside the second heat exchanger. The lower end of the spiral heat exchange tube is connected to the second heat exchange inlet, and the upper end of the spiral heat exchange tube is connected to the second heat exchange outlet. Low-temperature sensitive medium is introduced into the spiral heat exchange tube through the second heat exchange inlet, and high-temperature sensitive medium is output through the second heat exchange outlet.

2. The sensitive medium heating device according to claim 1, characterized in that, The first heat exchanger adopts a finned heat exchange tube structure, with both ends of the finned heat exchange tube connected to the first heat exchange output port and the first heat exchange input port.

3. The sensitive medium heating device according to claim 1, characterized in that, The second heat exchanger is equipped with a pressure relief valve.

4. The sensitive medium heating device according to claim 1, characterized in that, The second heat exchanger is also equipped with a pressure sensor and a temperature sensor.

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