Energy-saving vaporization device of depressurization flash evaporation coupling kettle type reboiler

Abstract

The utility model discloses an energy-saving vaporization device of a depressurization flash coupling kettle type reboiler, which is characterized in that the temperature of kettle liquid is lower than that of tower top steam through depressurization and cooling, the kettle liquid is subjected to heat exchange with the tower top steam in the kettle type reboiler after being subjected to flash evaporation and cooling, the kettle liquid absorbs heat to be vaporized and enters a gas buffer tank together with flash steam; and high-quality gas capable of being compressed and heated is provided for heat pump rectification and other processes.

Description

Technical Field

[0001] An energy-saving vaporization device with pressure reduction flash evaporation coupled to a kettle reboiler is mainly used in the field of waste heat utilization and energy saving in the chemical industry, especially in the recovery and utilization of waste heat from the top steam of distillation columns in chemical enterprises. Background Technology

[0002] Traditional methods for utilizing waste heat from overhead steam in distillation typically involve cooling the overhead steam with circulating cooling water to reduce its temperature, resulting in the waste of low-grade heat energy contained within the overhead steam. Traditional heat pump distillation methods for utilizing waste heat from overhead steam generally involve direct compression or transferring the heat from the overhead steam to an intermediate medium for compression and heating to achieve the recovery and utilization of low-grade waste heat. However, traditional heat pump distillation is not suitable for overhead steam containing non-condensable gases. This invention develops a specialized pressure-reducing flash evaporation coupled reboiler for utilizing waste heat from overhead steam containing non-condensable gases, thereby fully utilizing the waste heat from overhead steam. Summary of the Invention

[0003] Therefore, this utility model discloses an energy-saving vaporization device for a pressure-reducing flash evaporation coupled kettle reboiler.

[0004] By reducing pressure and temperature, the temperature of the liquid in the reactor is lower than that of the vapor at the top of the column. After the liquid in the reactor is flash-cooled, it exchanges heat with the vapor at the top of the column in the reactor reboiler. The liquid in the reactor absorbs heat and vaporizes, and together with the flash vapor, it enters the gas buffer tank, providing high-quality gas that can be compressed and heated for processes such as heat pump distillation.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0006] An energy-saving vaporization device for a pressure-reducing flash evaporation coupled reboiler consists of a top steam pipeline, a reboiler outlet valve, a reboiler, a pressure-reducing valve, a flash tank, and a gas buffer tank.

[0007] The flash evaporator is installed above the reboiler.

[0008] A pressure reducing valve is installed on the flash evaporator.

[0009] A bottom liquid outlet valve is installed on the bottom liquid outlet pipeline of the reboiler.

[0010] The overhead steam enters the reboiler through the overhead steam pipeline, transferring the low-grade waste heat contained in the overhead steam to the bottom liquid. The bottom liquid first reduces its pressure and temperature through the bottom liquid pressure reducing valve, and gas-liquid separation is achieved in the bottom liquid flash tank. The low-temperature bottom liquid enters the reboiler to exchange heat with the overhead steam, generating saturated steam, which, together with the flash steam from the bottom liquid flash tank, enters the gas buffer tank.

[0011] The beneficial effects of this utility model are: it fully recovers the overhead steam containing non-condensable gases, makes deep use of the waste heat energy of the overhead gas, realizes the recovery and utilization of low-grade waste heat, the whole process is simple and reliable, and the equipment operates safely and stably. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the present invention.

[0013] In the diagram: 1. Top vapor pipeline, 2. Liquid outlet valve, 3. Reboiler, 4. Liquid pressure reducing valve, 5. Liquid flash tank, 6. Gas buffer tank. Detailed Implementation

[0014] An energy-saving vaporization device for a pressure-reducing flash evaporation coupled reboiler consists of a tower top vapor pipeline 1, a reboiler outlet valve 2, a reboiler 3, a reboiler pressure reducing valve 4, a reboiler flash tank 5, and a gas buffer tank 6.

[0015] The flash evaporator 5 is installed above the reboiler 3.

[0016] A pressure reducing valve 4 is installed on the flash evaporator 5.

[0017] A kettle liquid outlet valve 2 is installed in the liquid phase outlet pipeline at the bottom of the kettle reboiler 3.

[0018] The top steam enters the reboiler 3 through the top steam pipeline 1, transferring the low-grade waste heat contained in the top steam to the bottom liquid. The bottom liquid first passes through the bottom liquid pressure reducing valve 4 to reduce pressure and temperature, and gas-liquid separation is achieved in the bottom liquid flash tank 5. The low-temperature bottom liquid enters the reboiler 3 to exchange heat with the top steam, generating saturated steam, which enters the gas buffer tank 6 together with the flash steam in the bottom liquid flash tank 5.

[0019] Detailed implementation process

[0020] After the pressure and temperature of the liquid in the reactor decrease after being reduced by the pressure reducing valve, the liquid undergoes gas-liquid separation in the flash evaporator. The gas phase goes to the gas buffer tank, while the liquid phase enters the reboiler. In the reboiler, the liquid phase exchanges heat with the overhead vapor and partially vaporizes after absorbing the heat energy from the overhead vapor. The vaporized vapor enters the gas buffer tank, while the liquid phase flows into the next process through the reactor outlet valve. The outlet flow rate is adjusted by the reactor outlet valve to control the liquid level in the reboiler to a reasonable position.

Claims

1. An energy-saving vaporization device for a pressure-reducing flash evaporation coupled with a kettle reboiler, comprising a top steam pipeline (1), a kettle liquid outlet valve (2), a kettle reboiler (3), a kettle liquid pressure reducing valve (4), a kettle liquid flash evaporator (5), and a gas buffer tank (6), characterized in that: The flash evaporator (5) is installed above the reboiler (3).

2. The energy-saving vaporization device for a pressure-reducing flash evaporation coupled kettle reboiler as described in claim 1, characterized in that: A pressure reducing valve (4) is installed on the flash evaporator (5).

3. The energy-saving vaporization device for a pressure-reducing flash evaporation coupled kettle reboiler as described in claim 1, characterized in that: The bottom liquid outlet pipeline of the kettle reboiler (3) is equipped with a kettle liquid outlet valve (2).

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