A distillation column heat energy utilization device

Abstract

The utility model discloses a rectifying column heat energy utilization device, including heat exchanger, first condenser, second condenser, condensate tank, the heat exchanger sets up the shell side and the shell side of pipe, the lower portion of heat exchanger is equipped with softened water inlet, the softened water inlet is linked together with the inlet of shell side, the shell side sets up the liquid level meter, the outlet of the shell side of heat exchanger is linked together with steam pipeline, sets up pressure regulating valve and safety valve on steam pipeline, the outlet of the pipe of heat exchanger is linked together with the inlet of first condenser, and the outlet of first condenser is linked together with the inlet of second condenser, the bottom of first condenser and second condenser is linked together with condensate tank, the utility model discloses a heat exchanger converts the heat of high temperature gas phase material into steam and realizes the utilization again, avoids the dissipation of heat energy in the prior art, realizes the effective utilization of high grade heat energy.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a distillation tower heat energy utilization device. Background Technology

[0002] Distillation columns are core equipment in industries such as chemical, pharmaceutical, and petrochemical for separating and purifying mixtures. Their working principle utilizes the differences in volatility among the components in the mixture, achieving separation and purification of the target components through a cyclical process of vapor-phase condensation at the top of the column and liquid-phase reboiling at the bottom. During distillation, a large amount of high-temperature gaseous substances continuously evaporate from the top of the column. These gaseous substances carry a significant amount of heat energy, and their condensation process is a crucial step in achieving component separation and a core node for heat energy recovery and utilization.

[0003] In the existing technology, the typical process flow for the condensation treatment of high-temperature gaseous substances at the top of a distillation column is as follows: The high-temperature gaseous substances at the top of the distillation column first enter the main condenser, and then flow through the secondary condenser in sequence. The high-temperature gaseous substances exchange heat with the circulating cooling water in the condenser, release heat and condense into liquid condensate, which flows into the condensate tank for subsequent processes or recycling; while the circulating cooling water, after absorbing heat and increasing in temperature, is transported to the cooling tower for spray cooling, and after cooling down, it is pumped back into the condenser for recycling, completing the circulation loop of the cooling medium.

[0004] However, the above-mentioned technical solutions have technical flaws. The core problem lies in the serious waste of thermal energy: a large amount of thermal energy released by the gaseous substances at the top of the distillation column during the condensation process is only used to heat the circulating cooling water. The heated circulating cooling water does not undergo any effective heat recovery and directly dissipates the heat into the atmosphere through the cooling tower, resulting in the complete loss of this high-grade thermal energy.

[0005] In the context of increasingly stringent requirements for energy conservation, emission reduction, low carbon emissions, and environmental protection in current industrial production, this extensive condensation and heat dissipation method not only results in low energy utilization efficiency and increases energy consumption costs in the production process, but also requires additional electricity resources for the continuous operation of the cooling tower, further increasing the overall production cost.

[0006] Therefore, there is an urgent need to develop a distillation column supporting device that can achieve efficient heat recovery and utilization while ensuring effective condensation of gaseous substances. Utility Model Content

[0007] This utility model addresses the aforementioned problems and overcomes the shortcomings of existing technologies by providing a distillation column heat energy utilization device, comprising a heat exchanger, a first condenser, a second condenser, and a condensate tank. The heat exchanger has a tube side and a shell side. A softened water inlet is located at the bottom of the heat exchanger and is connected to the inlet of the shell side. A level gauge is installed in the shell side. The outlet of the shell side of the heat exchanger is connected to a steam pipeline, and a pressure gauge, a pressure regulating valve, and a safety valve are installed on the steam pipeline. The outlet of the tube side of the heat exchanger is connected to the inlet of the first condenser, and the outlet of the first condenser is connected to the inlet of the second condenser. The bottom ends of the first and second condensers are connected to the condensate tank.

[0008] Preferably, the first condenser is connected to the first water inlet pipe and the first water return pipe, and the second condenser is connected to the second water inlet pipe and the second water return pipe.

[0009] Preferably, an emergency pressure relief valve is provided at the upper end of the heat exchanger, and a drain valve is provided at the lower end of the heat exchanger.

[0010] Preferably, the volume of the first condenser is larger than the volume of the second condenser.

[0011] Preferably, a valve assembly is provided between the softened water inlet and the shell-side inlet.

[0012] Preferably, the steam pipeline is provided with an insulation layer, and the slope of the steam pipeline is ≥3‰.

[0013] The beneficial effects of this utility model are: This invention converts the heat of high-temperature gaseous substances into steam via a heat exchanger, which is then fed into a steam pipeline for reuse. This avoids heat loss as in existing technologies and enables the utilization of high-grade heat energy. The recovered steam can be directly used in production, reducing external steam procurement or energy consumption; it also reduces reliance on cooling towers, lowers electricity consumption, further reduces overall production costs, minimizes heat waste and electricity consumption, and lowers carbon emissions. Pressure gauges, pressure regulating valves, and safety valves are installed on the steam pipeline to achieve precise pressure control and overpressure protection, preventing equipment damage and ensuring stable production operation. After the high-temperature gaseous substances recover heat through the heat exchanger, they are condensed again through a two-stage condenser to ensure effective component separation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a distillation tower heat energy utilization device according to the present invention.

[0015] The markings in the diagram are as follows: 1 is the distillation column, 2 is the softened water inlet, 3 is the emergency pressure relief valve, 4 is the heat exchanger, 5 is the first condenser, 6 is the second condenser, 7 is the drain valve, 8 is the condensate tank, 9 is the 0.3MPa steam network, 10 is the vacuum pump, 11 is the second return water pipeline, 12 is the second inlet water pipeline, 13 is the first return water pipeline, and 14 is the first inlet water pipeline. Detailed Implementation

[0016] To make the technical problems solved, the technical solutions, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] Combination Figure 1 As shown, this utility model is a distillation column heat energy utilization device, which is connected to the distillation column 1 and includes a heat exchanger 4, a first condenser 5, a second condenser 6, and a condensate tank 8. The heat exchanger 4 is configured with a tube side and a shell side. A softened water inlet 2 is located at the bottom of the heat exchanger 4. The softened water inlet 2 is connected to the inlet of the shell side. A level gauge is installed in the shell side. The water inlet is monitored by the level gauge to keep the shell side at a preset level. The level gauge is electrically connected to the valve group to control the water inlet.

[0018] The shell-side inlet of heat exchanger 4 is connected to the softened water inlet 2, and the shell-side outlet is connected to the steam pipeline. A pressure gauge, a pressure regulating valve, and a safety valve are installed on the steam pipeline. The pressure gauge monitors the pressure of the steam in the steam pipeline, and the pressure regulating valve is used to control the output of 0.3MPa saturated steam. The safety valve releases pressure to prevent damage to the equipment due to overpressure.

[0019] The inlet of the tube side of heat exchanger 4 is connected to the gas phase outlet of distillation column 1, the outlet of the tube side of heat exchanger 4 is connected to the inlet of the first condenser 5, and the outlet of the first condenser 5 is connected to the inlet of the second condenser 6; the bottom ends of the first condenser 5 and the second condenser 6 are connected to the condensate tank 8.

[0020] Specifically, the first condenser 5 is connected to the first water inlet pipe 14 and the first water return pipe 13, and the second condenser 6 is connected to the second water inlet pipe 12 and the second water return pipe 11.

[0021] Specifically, an emergency pressure relief valve 3 is installed at the upper end of the heat exchanger 4, and a drain valve 7 is installed at the lower end of the heat exchanger 4. The emergency pressure relief valve 3 is opened in case of emergency or when maintenance is required, and releases the steam inside the heat exchanger 4 to relieve pressure.

[0022] Drain valve 7 is connected to the drain pipeline. After the heat exchanger 4 has been running for a long time, some impurities will accumulate inside the heat exchanger 4, affecting the quality of steam. By opening drain valve 7 to drain water regularly, the operating effect of heat exchanger 4 can be ensured.

[0023] Specifically, the volume of the first condenser 5 is larger than that of the second condenser 6. The first condenser 5 is the main condenser, which needs to condense most of the gaseous substances coming out of the top of the distillation column 1 and bears the main heat load; the second condenser 6 is the secondary condenser, which only processes a small amount of uncondensed gaseous substances and has a lower heat load than the first condenser 5.

[0024] Specifically, the steam pipeline is equipped with an insulation layer, and the slope of the steam pipeline is ≥3‰. The insulation layer can reduce heat loss during steam transportation; the pipeline slope is ≥3‰, and a steam trap is installed at the lowest point to prevent condensate accumulation.

[0025] The working process of this utility model is as follows: This utility model is connected to the gas phase outlet of the distillation column 1. The high-temperature gaseous substance (150-170℃, evaporation rate of 23t / h) generated by distillation in the distillation column 1 enters from the tube side inlet of the heat exchanger 4, flows along the tube side and releases heat.

[0026] The shell-side inlet of heat exchanger 4 is connected to the softened water inlet 2. After the softened water absorbs the heat from the high-temperature gaseous substances in the tube side, it vaporizes to produce steam, which is output from the steam pipeline. The pressure of the steam in the steam pipeline is monitored by a pressure gauge. The steam pressure is stabilized at 0.3MPa (evaporation rate of 2.5t / h) by a pressure regulating valve before being output into the 0.3MPa steam network 9 for industrial production. If the pressure exceeds the limit, the safety valve will release the pressure.

[0027] After releasing heat through heat exchanger 4, the gaseous substance sequentially enters the first condenser 5 and the second condenser 6, where it exchanges heat with circulating cooling water. The circulating cooling water for the first condenser 5 enters through the first inlet pipe 14 and exits through the first return pipe 13, while the circulating cooling water for the second condenser 6 enters through the second inlet pipe 12 and exits through the second return pipe 11. Both the first condenser 5 and the second condenser 6 use circulating cooling water as the cooling medium.

[0028] The gaseous substance is gradually condensed into liquid condensate in the two-stage condenser, and finally flows into the condensate tank 8 for subsequent processes or recycling.

[0029] The uncondensed residual material after passing through heat exchanger 4, first condenser 5, and second condenser 6 is sucked away by vacuum pump 10, completing the entire process.

[0030] During equipment maintenance, water is periodically drained by opening drain valve 7 to ensure the operating effect of heat exchanger 4.

[0031] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. A distillation column heat energy utilization device, characterized in that, Includes heat exchanger (4), first condenser (5), second condenser (6), and condensate tank (8); The heat exchanger (4) is provided with a tube side and a shell side. A softened water inlet (2) is provided at the bottom of the heat exchanger (4). The softened water inlet (2) is connected to the inlet of the shell side. A level gauge is provided in the shell side. The outlet of the shell side of the heat exchanger (4) is connected to a steam pipeline. A pressure gauge, a pressure regulating valve and a safety valve are provided in the steam pipeline. The outlet of the tube side of the heat exchanger (4) is connected to the inlet of the first condenser (5). The outlet of the first condenser (5) is connected to the inlet of the second condenser (6). The bottom ends of the first condenser (5) and the second condenser (6) are connected to the condensate tank (8).

2. The distillation column heat energy utilization device according to claim 1, characterized in that, The first condenser (5) is connected to the first water inlet pipe (14) and the first water return pipe (13), and the second condenser (6) is connected to the second water inlet pipe (12) and the second water return pipe (11).

3. The distillation column heat energy utilization device according to claim 1, characterized in that, An emergency pressure relief valve (3) is provided at the upper end of the heat exchanger (4), and a drain valve (7) is provided at the lower end of the heat exchanger (4).

4. The distillation column thermal energy utilization device according to claim 1, characterized in that, The volume of the first condenser (5) is greater than the volume of the second condenser (6).

5. The distillation column heat energy utilization device according to claim 1, characterized in that, A valve assembly is provided between the softened water inlet (2) and the shell-side inlet.

6. The distillation column thermal energy utilization device according to claim 1, characterized in that, The steam pipeline is equipped with an insulation layer, and the slope of the steam pipeline is ≥3‰.

Images