Conduction oil flash evaporation system
The combined design of a thermal oil boiler and a multi-stage flash tank solves the problem of multi-temperature gas-phase thermal oil output, achieves equipment reduction and flexible temperature control, and meets the needs of various heat users.
Patent Information
- Application Number
- CN202422717652.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-07
AI Technical Summary
In the prior art, heat users who need a variety of gas-phase thermal oil temperatures need multiple thermal oil furnaces and flash tanks, resulting in excessive equipment investment and floor space.
The design of a thermal oil furnace combined with a multi-stage flash tank is adopted. By controlling the flow and temperature of the thermal oil, the output of multi-temperature gas-phase thermal oil is achieved to meet the needs of different heat users.
It is possible to produce multi-temperature gas-phase thermal oil using one thermal oil boiler to meet the needs of different heat users. At the same time, the flow rate and temperature can be adjusted, reducing the number of equipment and floor space.
Smart Images
Figure CN223474430U_ABST
Abstract
Description
Technical Field
[0001] This invention provides a multi-stage flash evaporation system for heat transfer oil, applicable to users who use heat transfer oil steam at multiple temperature points. Background Technology
[0002] Vapor-phase heat transfer oil has a wide range of applications in industry, providing a highly efficient and reliable method for transferring heat energy. Vapor-phase heat transfer oil systems are particularly suitable for industrial processes requiring high temperatures. These systems can operate at higher temperatures than liquid-phase systems, typically up to 400°C or even higher, and offer very stable heat transfer performance. Compared to steam or electric heating, vapor-phase heat transfer oil systems offer higher thermal efficiency and energy utilization in many cases. Vapor-phase heat transfer oil systems can provide very precise temperature control, which is crucial for ensuring product quality and process safety. Vapor-phase heat transfer oil systems typically have lower operating pressures, which contributes to improved overall system safety. These advantages make vapor-phase heat transfer oil systems ideal for many high-temperature processes and complex heating requirements in industrial applications. A common process involves using a heat transfer oil furnace and flash evaporation tank to convert the high-temperature liquid-phase heat transfer oil output from the furnace into vapor-phase heat transfer oil after depressurization.
[0003] For heat users who require multiple vapor phase heat transfer oil temperatures, if each temperature level of vapor phase heat transfer oil is prepared using a separate heat transfer oil furnace and a flash tank, the required equipment would undoubtedly be excessive, increasing both investment and floor space. Utility Model Content
[0004] The technical problem solved by this application is to overcome the shortcomings of the prior art and provide a heat transfer oil flash evaporation system. This system utilizes a single heat transfer oil furnace to output high-temperature liquid-phase heat transfer oil, and achieves multi-temperature vapor-phase heat transfer oil output through multi-stage flash evaporation. The flash evaporation rate of the first stage is controlled by the outlet liquid-phase heat transfer oil temperature of the furnace. The flash evaporation rate of the second stage is controlled by controlling the amount of high-temperature condensate entering the second-stage flash tank, and so on. This allows a single heat transfer oil furnace to achieve multi-temperature vapor-phase heat transfer oil output through multi-stage flash evaporation, meeting the diverse needs of heat users.
[0005] The technical solution provided in this application is as follows:
[0006] A thermal oil flash evaporation system includes a thermal oil furnace and n-stage flash tanks, where n is an integer greater than 1. The flash tanks supply heat to different heat users, and the resulting liquid thermal oil is converted back to the flash tanks. The n-stage flash tanks include an i-th stage flash tank and an n-th stage flash tank, where i+1≤n. The outlet of the thermal oil furnace is connected to the i-th and n-th stage flash tanks via an inlet pipeline. The i-th stage flash tank is connected to a piping system for supplying liquid thermal oil to the subsequent flash tanks and the thermal oil furnace. The piping system includes the i-th stage flash tank... The system consists of a first-stage circulation pipeline and an (i+1)th-stage liquid inlet pipeline. The first-stage flash tank is connected to the thermal oil furnace via the first-stage circulation pipeline. Along the flow direction of the thermal oil in the first-stage circulation pipeline, a thermal oil circulation pump and a regulating valve are connected in sequence on the first-stage circulation pipeline. The regulating valve is used to control the flow rate of the thermal oil. The first-stage circulation pipeline is connected to the (i+1)th-stage flash tank via the (i+1)th-stage liquid inlet pipeline. The connection point between the (i+1)th-stage liquid inlet pipeline and the circulation pipeline is located between the thermal oil circulation pump and the regulating valve.
[0007] The nth-stage flash tank is connected to the thermal oil furnace via the final i-th-stage circulation pipeline.
[0008] The j-th stage flash tank is connected to heat user j via an outlet pipe, where j ∈ [1-n]. Heat user j is connected to condensate tank via a return pipe, and condensate tank is connected to the j-th stage flash tank via a condensation pipe.
[0009] A heat transfer oil condensate pump is connected to the condenser pipe.
[0010] The inlet pipeline is also connected to a branch pipeline. One end of the branch pipeline is connected to the inlet pipeline and the other end is connected to another flash tank. The other flash tank is the x-th stage flash tank, x∈[1,n] and x≠i. The other end of the branch pipeline is specifically connected between the heat transfer oil circulation pump and the regulating valve on the x-th stage inlet pipeline connected to the x-th stage flash tank.
[0011] Pressure reducing valves are installed on both the liquid inlet line and the (i+1)th stage liquid inlet line.
[0012] The pressure reducing valves connected to the inlet pipeline are located as follows: along the flow direction of the liquid phase heat transfer oil in the inlet pipeline, the connection points of the branch pipelines and the pressure reducing valves are sequentially distributed on the inlet pipeline; the pressure reducing valves connected to the x-th stage inlet pipeline are located as follows: along the flow direction of the liquid phase heat transfer oil in the x-th stage inlet pipeline, the connection points of the branch pipelines and the x-th stage inlet pipeline, and the pressure reducing valves are sequentially distributed on the x-th stage inlet pipeline.
[0013] When the heat user i supplied by the i-th stage flash tank stops using it, liquid heat transfer oil is supplied to the (i+1)-th stage flash tank through a branch pipeline.
[0014] When the load required by heat user i+1 is greater than the load required by heat user i, the output flow rate of the heat transfer oil circulation pump connected to the i-th stage flash tank through the i-th stage circulation pipeline is greater than the flow rate entering the i+1-th stage flash tank. When the steam flow rate in the i+1-th stage flash tank needs to be changed, the regulating valve connected to the i-th stage circulation pipeline is controlled to change the flow rate of liquid phase heat transfer oil entering the i+1-th stage flash tank.
[0015] The final stage circulation pipeline is only connected to a heat transfer oil circulation pump.
[0016] The piping system connected to the i-th stage flash tank has ni sets.
[0017] In summary, this application includes at least the following beneficial technical effects:
[0018] A single thermal oil heater is used for heating, and vapor-phase thermal oil at different temperatures is produced through multi-stage flash evaporation to supply heat users. At the same time, the output of vapor-phase thermal oil at each temperature is kept stable. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the process for producing multi-temperature vapor phase heat transfer oil using a single heat transfer oil furnace and a multi-stage flash evaporation method, as described in the utility model.
[0020] Figure 2 This is a process diagram with three flash tanks.
[0021] Explanation of reference numerals: 1-Heat transfer oil furnace, 2-Flash tank I, 3-Condensate tank I, 4-Heat transfer oil condensate pump I, 5-Heat transfer oil circulation pump I, 6-Flash tank II, 7-Condensate tank II, 8-Heat transfer oil condensate pump II, 9-Heat transfer oil circulation pump II, 10-Pressure reducing valve I, 11-Pressure reducing valve II, 12-Regulating valve. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments disclosed herein will be described in further detail below with reference to the accompanying drawings.
[0023] This application discloses a heat transfer oil flash evaporation system, which uses a single heat transfer oil furnace and a multi-stage flash evaporation method to produce multi-temperature vapor phase heat transfer oil, such as... Figure 1 As shown, it includes a thermal oil furnace 1, a flash tank I2, a condensate tank I3, a thermal oil condensate pump I4, a thermal oil circulation pump I5, a flash tank II6, a condensate tank II7, a thermal oil condensate pump II8, and a thermal oil circulation pump II9.
[0024] The outlet of the thermal oil heater 1 is connected to the flash tank I2 via an inlet pipeline. The gaseous thermal oil produced by the flash tank I2 is used to heat user 1, after which it becomes liquid thermal oil and returns to the flash tank I2. The gaseous thermal oil produced by the flash tank II6 is used to heat user 2, after which it becomes liquid thermal oil and returns to the flash tank II6. The flash tank I2 is connected to the thermal oil heater 1 via a first circulation pipeline. Along the flow direction of the thermal oil in the first circulation pipeline, thermal oil circulation pumps are connected in sequence on the first circulation pipeline. I5 and regulating valve 12, the regulating valve 12 is used to control the flow rate of high temperature heat transfer oil entering the heat transfer oil furnace 1, the first circulation pipeline is connected to the flash tank II6 through the second stage liquid inlet pipeline, the connection point of the second stage liquid inlet pipeline and the first circulation pipeline is located between the heat transfer oil circulation pump I5 and the regulating valve 12; the flash tank II6 is connected to the heat transfer oil furnace 1 through the second circulation pipeline, the second circulation pipeline is connected to the heat transfer oil circulation pump II9; the liquid inlet pipeline is connected to the flash tank II6 through a branch pipeline.
[0025] Flash tank I2 is connected to heat user 1 through the first gas outlet pipeline. Heat user 1 is connected to condensate tank I3 through the first liquid return pipeline. Condensate tank I3 is connected to flash tank I2 through the first condensation pipeline. A heat transfer oil condensate pump I4 is connected to the first condensation pipeline.
[0026] Flash tank II6 is connected to heat user 2 via a second outlet pipe. Heat user 2 is connected to condensate tank II7 via a second return pipe. Condensate tank II7 is connected to flash tank II6 via a second condensation pipe. A heat transfer oil condensate pump II8 is installed on the second condensation pipe.
[0027] A pressure reducing valve I10 is connected to the inlet line, and a pressure reducing valve II11 is connected to the second-stage inlet line.
[0028] The other end of the branch pipeline is connected to the second-stage liquid inlet pipeline. Along the flow direction of the liquid heat transfer oil in the second-stage liquid inlet pipeline, the connection point between the branch pipeline and the second-stage liquid inlet pipeline, and the pressure reducing valve II11 are distributed sequentially on the second-stage liquid inlet pipeline.
[0029] Low-temperature liquid heat transfer oil is heated to a certain temperature in heat transfer oil furnace 1 under a certain pressure. After being depressurized by pressure reducing valve I10, the pressure of the heat transfer oil is lower than its saturation pressure, and then it enters flash tank I2. The high-temperature liquid heat transfer oil undergoes partial flash vaporization in flash tank I2, forming gaseous heat transfer oil at the corresponding temperature. The gaseous heat transfer oil is transported to heat user I through pipelines via natural circulation. After releasing latent heat in heat user I, it forms saturated liquid heat transfer oil, which collects in condensate tank I3. Then, it is transported to flash tank I2 by heat transfer oil condensate pump I4 at the bottom of condensate tank I3. The liquid heat transfer oil in flash tank I2 is partially transported to flash tank II6 by heat transfer oil circulation pump I5 at the bottom of the tank, while the other part is returned to heat transfer oil furnace 1 for reheating. The liquid-phase heat transfer oil sent to flash tank II6 is saturated. After being depressurized by pressure reducing valve II11, it enters flash tank II6 to complete a phase transition, forming another low-temperature gaseous heat transfer oil. This low-temperature gaseous heat transfer oil is transported to heat user II through pipelines. In heat user II, it releases latent heat and forms saturated liquid-phase heat transfer oil, which then enters condensate tank II7. From there, it is pumped back to flash tank II6 by heat transfer oil condensate pump II8 at the bottom of condensate tank II7. A portion of the heat transfer oil in flash tank II6 is then returned to heat transfer oil furnace 1 by heat transfer oil circulation pump II9 for reheating, completing the entire cycle.
[0030] The pressure inside flash tank I is controlled by adjusting the outlet temperature of the heat transfer oil in the heat transfer oil furnace; the pressure inside flash tank II is controlled by adjusting the flow rate entering flash tank II.
[0031] The heat transfer oil heated by the heat transfer oil furnace 1 is in the liquid phase, and its temperature is higher than that of the steam generated in the flash tank I2. When the steam flow rate in the flash tank I2 needs to be changed, it is achieved by changing the outlet temperature of the heat transfer oil in the heat transfer oil furnace.
[0032] When the load required by heat user II is greater than the load required by heat user I, the circulation rate of thermal oil furnace 1 must meet the flow requirements of flash tank I2 and flash tank II6. That is, the output flow rate of thermal oil circulation pump I5 must always be greater than the flow rate entering flash tank II6. When the steam flow rate in flash tank II6 needs to be changed, it can be achieved by controlling the regulating valve 12 to change the flow rate of liquid thermal oil entering flash tank II6.
[0033] Meanwhile, to ensure that heat user II can still be used when heat user I is shut down, a branch pipeline is installed at the outlet of thermal oil heater 1 directly to the second-stage liquid inlet pipeline connected to flash tank II6. The pipeline connection point is before pressure reducing valve II11. When heat user I is shut down, the flashing requirements of flash tank II6 can be directly achieved by controlling the outlet temperature of thermal oil heater 1, thus meeting the gaseous phase heat transfer oil needs of heat user II.
[0034] In summary, the core idea of this invention is to use only one thermal oil heater in the entire system. The heat provided by this heater can generate vapor-phase thermal oil at different temperatures through multi-stage flash tanks. Simultaneously, the vapor-phase thermal oil at each temperature can be adjusted to a certain extent using different control methods, ensuring that they do not interfere with each other. This satisfies the different heating needs of users while also achieving load adjustability.
[0035] The above description uses a two-stage, series-connected flash evaporation system for heat transfer oil at two different temperature levels. This patent can be extended to use in multi-stage, series-connected flash evaporation systems. For example, when a third-stage flash tank is included, such as... Figure 2 As shown.
[0036] This patent proposes a heat transfer oil flash evaporation system and process, which adopts a multi-stage flash evaporation method and a design of one heat transfer oil furnace + multiple series flash evaporation tanks. The high-temperature liquid phase heat transfer oil output from the heat transfer oil furnace is used to generate multi-temperature gas phase heat transfer oil output through multi-stage flash evaporation to meet the different needs of heat users.
[0037] The contents not described in detail in this application specification are common knowledge to those skilled in the art.
[0038] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.
Claims
1. A heat transfer oil flash evaporation system, characterized in that: The system includes a thermal oil heater (1) and an n-stage flash tank, where n is an integer greater than 1. The flash tanks supply heat to different heat users, and the resulting liquid thermal oil is converted back to the flash tank. The n-stage flash tank includes an i-th stage flash tank and an n-th stage flash tank, where i+1≤n. The outlet of the thermal oil heater (1) is connected to the i-th stage flash tank and the n-th stage flash tank via an inlet pipeline. The i-th stage flash tank is connected to a piping system for supplying liquid thermal oil to the subsequent flash tanks and the thermal oil heater (1). The piping system includes an i-th stage circulating... The loop pipeline and the (i+1)th stage liquid inlet pipeline, the i-th stage flash tank is connected to the heat transfer oil furnace (1) through the i-th stage circulation pipeline, along the flow direction of the heat transfer oil in the i-th stage circulation pipeline, the i-th stage circulation pipeline is connected in sequence with a heat transfer oil circulation pump and a regulating valve, the regulating valve is used to control the flow rate of the heat transfer oil, the i-th stage circulation pipeline is connected to the (i+1)th stage flash tank through the (i+1)th stage liquid inlet pipeline, the pipeline connection point of the (i+1)th stage liquid inlet pipeline and the circulation pipeline is located between the heat transfer oil circulation pump and the regulating valve; The nth stage flash tank is connected to the thermal oil furnace (1) through the last stage i-th stage circulation pipeline.
2. The heat transfer oil flash evaporation system according to claim 1, characterized in that: The flash tank includes a j-th stage flash tank, j∈[1-n]. The j-th stage flash tank is connected to heat user j through an outlet pipe. Heat user j is connected to a condensate tank through a return pipe. The condensate tank is connected to the j-th stage flash tank through a condensation pipe.
3. The heat transfer oil flash evaporation system according to claim 2, characterized in that: A heat transfer oil condensate pump is connected to the condenser pipe.
4. The heat transfer oil flash evaporation system according to claim 1, characterized in that: The inlet pipeline is also connected to a branch pipeline. One end of the branch pipeline is connected to the inlet pipeline and the other end is connected to the x-th stage flash tank, where x∈[1,n] and x≠i. The other end of the branch pipeline is specifically connected between the heat transfer oil circulation pump and the regulating valve on the x-th stage inlet pipeline connected to the x-th stage flash tank.
5. The heat transfer oil flash evaporation system according to claim 4, characterized in that: Pressure reducing valves are installed on both the liquid inlet line and the (i+1)th stage liquid inlet line.
6. The heat transfer oil flash evaporation system according to claim 5, characterized in that: The pressure reducing valves connected to the inlet pipeline are located as follows: along the flow direction of the liquid phase heat transfer oil in the inlet pipeline, the connection points of the branch pipelines and the pressure reducing valves are sequentially distributed on the inlet pipeline; the pressure reducing valves connected to the x-th stage inlet pipeline are located as follows: along the flow direction of the liquid phase heat transfer oil in the x-th stage inlet pipeline, the connection points of the branch pipelines and the x-th stage inlet pipeline, and the pressure reducing valves are sequentially distributed on the x-th stage inlet pipeline.
7. The heat transfer oil flash evaporation system according to claim 4, characterized in that: When the heat user i supplied by the i-th stage flash tank stops using it, liquid heat transfer oil is supplied to the (i+1)-th stage flash tank through a branch pipeline.
8. The heat transfer oil flash evaporation system according to claim 1, characterized in that: When the load required by heat user i+1 is greater than the load required by heat user i, the output flow rate of the heat transfer oil circulation pump connected to the i-th stage flash tank through the i-th stage circulation pipeline is greater than the flow rate entering the i+1-th stage flash tank. When the steam flow rate in the i+1-th stage flash tank needs to be changed, the regulating valve connected to the i-th stage circulation pipeline is controlled to change the flow rate of liquid phase heat transfer oil entering the i+1-th stage flash tank.
9. The heat transfer oil flash evaporation system according to claim 1, characterized in that: The piping system connected to the i-th stage flash tank has ni sets.