A steam pressure-raising system and method based on heat conduction replacement of reaction equipment heat release

Abstract

The application discloses a steam pressure-raising system and method based on reaction equipment heat conduction replacement, which comprises a reaction heat release device, a vaporizer and a closed circulation loop connected with the two, the closed circulation loop is filled with a heat conduction medium, and the reaction heat release device is provided with a heat exchange structure for transferring heat to the heat conduction medium; the heat conduction medium circulates in the loop, introduces the heat generated by the reaction heat release device into the vaporizer, forms indirect heat coupling with water and exchanges heat to generate water vapor and output; the steam generation process is completed in the independent vaporizer, the non-metal reaction heat release device avoids directly bearing the high-temperature and high-pressure steam working condition, higher pressure and temperature steam output can be realized, and the equipment operation stability and waste heat utilization efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of chemical thermal energy utilization and steam generation technology, specifically to a steam pressurization system and method based on exothermic and conductive heat exchange in reaction equipment. Background Technology

[0002] In chemical production, highly exothermic reaction devices such as HCl synthesis furnaces release a large amount of reaction heat during operation. To improve energy efficiency, existing technologies typically incorporate heat exchange structures within the reaction exothermic device, directly introducing water as the heat exchange medium. The water directly absorbs the reaction heat and vaporizes within the equipment, then outputs steam for production use via a flash tank or steam drum. In other words, reaction heat release, heat transfer, and steam generation are all completed within the same device.

[0003] However, due to the presence of corrosive media during the reaction process, the main body of the reaction exothermic device is mostly made of non-metallic materials such as graphite, which has limited pressure resistance and temperature resistance. As a result, the pressure and temperature of the produced steam are limited by the material properties of the main body of the equipment, making it difficult to achieve high-pressure steam output and greatly restricting the application range of the by-product steam. At the same time, the reaction exothermic and steam generation are directly coupled in the same equipment, resulting in large local heat load and thermal stress, which affects its operational stability and service life. Summary of the Invention

[0004] The purpose of this invention is to provide a steam pressurization system and method based on exothermic and conductive heat exchange in a reaction device, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a steam boosting system based on exothermic and conductive heat exchange in a reaction device, comprising: At least one exothermic reaction device; At least one vaporizer; A closed loop connecting the reaction exothermic device and the vaporizer is filled with a heat-conducting medium. The reaction exothermic device is equipped with a heat exchange structure for transferring heat to the heat-conducting medium. The heat-conducting medium flows within the closed loop to introduce the heat generated by the reaction exothermic device into the vaporizer for indirect heat exchange with water to generate water vapor, which is then output from the vaporizer.

[0006] Preferably, the closed-loop circuit includes a delivery pump and connecting pipelines.

[0007] Preferably, the closed loop is further provided with a heat transfer medium storage tank, which is located downstream of the vaporizer.

[0008] Preferably, the closed loop is further provided with an auxiliary heating device, which is located upstream of the vaporizer.

[0009] Preferably, the heat-conducting medium is a liquid or gaseous heat-conducting medium.

[0010] Preferably, the heat-conducting medium is heat-conducting oil.

[0011] Preferably, the heat-conducting medium is silicone oil.

[0012] Preferably, the exothermic reaction device is an HCl synthesis furnace.

[0013] This invention also provides a steam pressure boosting method based on exothermic and conductive heat displacement in a reaction device, comprising the following steps: S1: Heating the internal heat-conducting medium within the reaction exothermic device; S2: The heated heat transfer medium is introduced into the vaporizer through a closed loop to exchange heat with the working medium entering the vaporizer, so that the working medium vaporizes to generate steam at a set pressure. S3: The heat transfer medium, after heat exchange and cooling, returns to the interior of the reaction exothermic device through the closed loop.

[0014] Preferably, an auxiliary heating device is provided upstream of the vaporizer, and the step between step S1 and step S2 further includes: After flowing out of the reaction exothermic device, the heat transfer medium first enters the auxiliary heating device for secondary heating to raise it to the target temperature before entering the vaporizer.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By using an intermediate heat transfer medium, indirect thermal coupling is achieved between the reaction heat release device and the vaporizer, and the reaction heat is transferred to the independently set vaporizer for steam generation. This eliminates the direct exposure of the reaction heat release device to high-temperature and high-pressure steam conditions, breaking through the limitations of non-metallic equipment materials on steam parameters and enabling the output of by-product steam at higher pressures and temperatures.

[0016] 2. An auxiliary heating device is installed upstream of the vaporizer. When the steam pressure requirement is high, the heat transfer medium can be heated a second time to further improve the steam parameters and meet different steam demand. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] In the diagram: 1. Reaction exothermic device; 2. Vaporizer; 3. Heat transfer medium storage tank; 4. Auxiliary heating device; 5. Transfer pump; 6. Connecting pipeline. Detailed Implementation

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0020] like Figure 1 As shown, the present invention provides a steam boosting system based on exothermic and conductive heat exchange in a reaction device. It mainly includes a reaction exothermic device 1, a vaporizer 2, and a closed-loop circuit connecting the reaction exothermic device 1 and the vaporizer 2. The closed-loop circuit is filled with a heat-conducting medium as an intermediate heat exchange medium. The reaction exothermic device 1 has an internal heat exchange structure for transferring heat to the heat-conducting medium. This heat exchange structure adopts a jacketed, partitioned heat exchange structure, and its arrangement is based on the principle of enabling the heat-conducting medium to fully absorb the reaction heat released from the reaction zone.

[0021] In this embodiment, the heat exchange structure is preferably a coil structure. The coil is evenly arranged around the circumference of the internal reaction zone of the reaction heat release device 1, thereby ensuring that the heat transfer medium is heated evenly and avoiding local overheating.

[0022] Vaporizer 2 is an independently installed metal heat exchanger, which can be a shell-and-tube heat exchanger, a U-tube heat exchanger, or other types of indirect heat exchangers. Since vaporizer 2 does not directly contact the corrosive reaction medium, it can be made of metal materials with excellent pressure resistance and temperature resistance (such as stainless steel or alloy steel), thus enabling it to withstand high-pressure and high-temperature steam conditions. Pure water is introduced as the working medium on the shell side of vaporizer 2, while a heated heat transfer medium is introduced on the tube side. The two exchange heat through the tube walls, allowing the pure water to absorb heat and vaporize to form saturated steam at a set pressure. The generated saturated steam is then output from the steam outlet at the top of vaporizer 2 to the downstream product steam system.

[0023] Furthermore, a heat transfer medium storage tank 3 is also provided in the closed loop. The heat transfer medium storage tank 3 is located downstream of the vaporizer 2 and is used to temporarily store the heat transfer medium after heat exchange and cooling by the vaporizer 2. The heat transfer medium storage tank 3 plays a buffering and regulating role, which can maintain the stability of the heat transfer medium flow rate in the closed loop and avoid the impact of instantaneous flow fluctuations on the system's heat exchange efficiency. On the other hand, the heat transfer medium storage tank 3 can also play a replenishment and storage role. When the system experiences heat transfer medium loss or needs to be replenished, it can be replenished through the storage tank, thereby ensuring the continuous and stable operation of the system.

[0024] Furthermore, the closed-loop system includes a delivery pump 5 and a connecting pipeline 6. The delivery pump 5 provides circulation power for the heat transfer medium within the closed-loop system. In this embodiment, a high-temperature resistant delivery pump is preferably used. The delivery pump can be a centrifugal pump, gear pump, screw pump, or other pump devices suitable for circulating heat transfer medium. Its location can be flexibly arranged according to the system pressure distribution and fluid characteristics. In this embodiment, it is located downstream of the heat transfer medium storage tank 3 and upstream of the reaction exothermic device 1. The connecting pipeline 6 connects the various devices within the system and forms the fluid channel of the closed-loop system. Preferably, a metal pipe with an insulation layer is used to reduce heat loss of the heat transfer medium during transportation.

[0025] Furthermore, an auxiliary heating device 4 is provided in the closed-loop circuit. Located upstream of the vaporizer 2, the auxiliary heating device 4 is used to reheat the heat transfer medium when necessary. The auxiliary heating device 4 can be any form capable of heating the heat transfer medium, such as an electric heater, steam heater, or fuel heater. When the downstream demand for product steam pressure is high (e.g., steam pressure greater than 0.8 MPa), the heat transferred by the reaction exothermic device 1 alone may not be sufficient to raise the heat transfer medium to the required target temperature. In this case, the auxiliary heating device 4 can be activated to reheat the heat transfer medium, raising its temperature to the target value before sending it into the vaporizer 2, thereby flexibly increasing the pressure and temperature of the product steam. When the downstream steam demand is low, the auxiliary heating device 4 can be shut down, and the heat transfer medium directly enters the vaporizer 2 from the reaction exothermic device 1 through the pipeline for heat exchange.

[0026] Furthermore, the heat transfer medium can be a liquid or gaseous medium, and should possess a high boiling point, good thermal stability, and high thermal conductivity to meet the system's requirements for steam temperature and pressure. Preferably, heat transfer oil is used as the heat transfer medium because it has a wide operating temperature range, good thermal stability, is not easily vaporized, can operate stably at high operating temperatures, and has low corrosiveness to pipelines and equipment, thus extending the system's service life. In another embodiment, silicone oil can also be preferred as the heat transfer medium, as it has a higher upper temperature limit and excellent chemical stability, making it suitable for high steam parameters and high-temperature operating conditions.

[0027] In other embodiments, the heat transfer medium may also be selected from other high-temperature resistant media that meet the specific operating conditions, in order to adapt to different temperature levels and different steam parameter requirements.

[0028] Furthermore, the exothermic reaction device 1 is an HCl synthesis furnace. During the operation of the HCl synthesis furnace, hydrogen and chlorine undergo a combination reaction to generate hydrogen chloride gas and release a large amount of heat of reaction. This heat of reaction serves as the main heat source of this system and is introduced into the vaporizer 2 via a heat transfer medium to generate water vapor. Of course, the type of exothermic reaction device 1 is not limited to this; it can also be applied to other types of strongly exothermic reaction equipment such as combustion furnaces.

[0029] Based on the above system structure, the present invention provides a steam pressurization method based on exothermic and conductive heat displacement of a reaction device, comprising the following steps: S1: Heating the internal heat-conducting medium within the reaction exothermic device; S2: The heated heat transfer medium is introduced into the vaporizer through a closed loop to exchange heat with the working medium entering the vaporizer, so that the working medium vaporizes to generate steam at a set pressure. S3: The heat transfer medium, after being cooled down by heat exchange, returns to the interior of the reaction exothermic device through a closed loop.

[0030] Specifically, in step S1, hydrogen and chlorine enter the reaction zone from the bottom of the reaction exothermic device 1 (HCl synthesis furnace) and undergo a chemical reaction to generate high-temperature hydrogen chloride gas and release a large amount of reaction heat. The heat released by the reaction is transferred to the heat-conducting medium flowing through it through the heat exchange structure inside the reaction exothermic device 1, thereby raising the temperature of the heat-conducting medium and heating the internal heat-conducting medium.

[0031] In step S2, the heated heat transfer medium flows out of the reaction exothermic device 1 through the connecting pipe 6 and is introduced into the vaporizer 2 through a closed loop. Inside the vaporizer 2, the heat transfer medium undergoes indirect heat exchange with the working medium (i.e., pure water) introduced on the shell side through the pipe wall. After absorbing heat, the working medium vaporizes to generate saturated steam at a set pressure. The generated saturated steam is output from the steam outlet at the top of the vaporizer 2 to the downstream product steam system for use in the production process.

[0032] In step S3, the heat transfer medium after heat exchange and cooling flows out from the bottom of the vaporizer 2, enters the heat transfer medium storage tank 3 through the connecting pipe 6 for temporary storage, and then returns to the interior of the reaction heat release device 1 through a closed loop driven by the delivery pump 5 to absorb the reaction heat again, thereby completing one closed loop.

[0033] Furthermore, an auxiliary heating device 4 is provided upstream of the vaporizer 2, and the following process is also included between steps S1 and S2: After flowing out of the reaction exothermic device 1, the heat transfer medium first enters the auxiliary heating device 4 for secondary heating to raise it to the target temperature before entering the vaporizer 2. Specifically, when the downstream requires a high product steam pressure (e.g., greater than 0.8 MPa), the auxiliary heating device 4 is activated to supplement the heating of the heat transfer medium, so that its temperature meets the target value required to generate high-pressure steam; when the downstream steam parameters are lower, the auxiliary heating device 4 can be turned off, and the heat transfer medium directly enters the vaporizer 2 for heat exchange.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steam boosting system based on exothermic and conductive heat displacement in a reaction device, characterized in that: include: At least one exothermic reaction device; At least one vaporizer; A closed loop connecting the reaction exothermic device and the vaporizer is filled with a heat-conducting medium. The reaction exothermic device is equipped with a heat exchange structure for transferring heat to the heat-conducting medium. The heat-conducting medium flows within the closed loop to introduce the heat generated by the reaction exothermic device into the vaporizer for indirect heat exchange with water to generate water vapor, which is then output from the vaporizer.

2. The steam boosting system based on exothermic and conductive heat displacement of the reaction equipment according to claim 1, characterized in that: The closed-loop circuit includes a delivery pump and connecting pipelines.

3. The steam boosting system based on exothermic and conductive heat displacement of the reaction equipment according to claim 1, characterized in that: The closed loop is also equipped with a heat transfer medium storage tank, which is located downstream of the vaporizer.

4. The steam boosting system based on exothermic and conductive heat displacement of the reaction equipment according to claim 1 or 3, characterized in that: An auxiliary heating device is also provided on the closed loop, and the auxiliary heating device is located upstream of the vaporizer.

5. The steam boosting system based on exothermic and conductive heat displacement of the reaction equipment according to claim 4, characterized in that: The heat-conducting medium is a liquid or gaseous heat-conducting medium.

6. The steam boosting system based on exothermic and conductive heat exchange in the reaction equipment according to claim 5, characterized in that: The heat transfer medium is heat transfer oil.

7. The steam boosting system based on exothermic and conductive heat displacement of the reaction equipment according to claim 5, characterized in that: The heat-conducting medium is silicone oil.

8. The steam boosting system based on exothermic and conductive heat displacement of the reaction equipment according to claim 1, characterized in that: The exothermic reaction device is an HCl synthesis furnace.

9. A steam pressure boosting method based on exothermic and conductive heat displacement in a reaction device, characterized in that, Includes the following steps: S1: Heating the internal heat-conducting medium within the reaction exothermic device; S2: The heated heat transfer medium is introduced into the vaporizer through a closed loop to exchange heat with the working medium entering the vaporizer, so that the working medium vaporizes to generate steam at a set pressure. S3: The heat transfer medium, after heat exchange and cooling, returns to the interior of the reaction exothermic device through the closed loop.

10. The steam pressure boosting method based on exothermic and conductive heat displacement of the reaction equipment according to claim 9, characterized in that: An auxiliary heating device is provided upstream of the vaporizer, and the process between step S1 and step S2 further includes: After flowing out of the reaction exothermic device, the heat transfer medium first enters the auxiliary heating device for secondary heating to raise it to the target temperature before entering the vaporizer.

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