Stripping tower for improving water stripping efficiency of esterified water

Abstract

The utility model discloses a stripping tower capable of improving the stripping efficiency of esterified water, which is characterized in that an esterified water tower top distributor is horizontally erected in a tower body below an outlet of a liquid inlet pipe and above a filler layer, the esterified water tower top distributor is plate-shaped, a plurality of through pipes which are through up and down are arranged on the esterified water tower top distributor, and the height of the through pipes is divided into two groups; the short pipe is an esterified water distribution pipe, and the long pipe is a gas phase overflow pipe; a high-temperature steam distributor is horizontally connected to an outlet of the gas inlet pipe at the lower part of the tower body and is a circular ring with a plurality of through holes in the top surface; a booster fan is arranged on the outer side of the tower body, and an air outlet of the booster fan is located below the high-temperature steam distributor. The pressure and the use amount of water vapor for steam stripping are greatly reduced, and the purpose of reducing the energy consumption in the steam stripping process is achieved; and meanwhile, by reducing the temperature of the steam stripping steam, the separation efficiency of the steam stripping steam and the organic components is improved.

Description

Technical Field

[0001] The utility model relates to a stripping tower, in particular to a stripping tower for improving the stripping efficiency of esterification water. Background Art

[0002] The stripping tower is a commonly used industrial wastewater pretreatment device. Generally, the stripping tower consists of stripping tower liquid phase supply equipment, stripping tower body, stripping liquid recovery equipment, stripping overflow component collection equipment, etc.

[0003] The entire stripping tower system is driven by high-temperature and high-pressure steam. Generally, the steam pressure is required to reach 0.3-0.4MPa and the temperature is around 130℃. Every ton of esterification water stripped requires about 1.5 tons of steam, which is a very energy-consuming process. Moreover, due to the large amount of water vapor, part of the organic gas stripped out will be cooled and returned to the esterification water storage tank, resulting in very low stripping efficiency, which seriously affects the processing capacity and treatment effect of the stripping tower. Repeated stripping is required to meet the requirements of subsequent organic waste gas treatment and biochemical treatment, which is a typical high energy consumption and low efficiency. Utility Model Content

[0004] In response to the problems existing in the prior art, the utility model provides a stripping tower that improves the efficiency of esterification water stripping. By improving the original design of the esterification water stripping tower and adding new auxiliary devices, the efficiency of removing organic light components in the stripping tower is improved. At the same time, by balancing the auxiliary devices and steam, the purpose of reducing energy consumption is achieved.

[0005] The utility model is achieved in that a stripping tower for improving the stripping efficiency of esterified water comprises a tower body, a liquid inlet pipe located at the upper part of the tower body, an air inlet pipe located at the lower part of the tower body, an air outlet pipe located at the top of the tower body, a liquid outlet pipe located at the bottom of the tower body and a packing layer located in the tower body; in the tower body, an esterified water tower top distributor is horizontally arranged below the outlet of the liquid inlet pipe and above the packing layer; the esterified water tower top distributor is in the shape of a plate and is provided with a plurality of through pipes which pass through the tower top and are vertically connected; the through pipes are divided into two groups in height, the short pipes being esterified water distribution pipes and the long pipes being gas phase overflow pipes; a high-temperature steam distributor is horizontally connected to the outlet of the air inlet pipe located at the lower part of the tower body, the high-temperature steam distributor being a circular ring with a plurality of through holes on the top surface; a booster fan is arranged on the outer side of the tower body, and the air outlet of the booster fan is located below the high-temperature steam distributor.

[0006] The angle between the air outlet of the booster fan and the inner wall of the stripping tower is between 35-65 degrees, and the air outlet does not extend inside the tower.

[0007] The booster fan includes a main booster fan and a standby fan.

[0008] The height of the gas phase overflow pipe is at least twice the height of the esterification water distribution pipe.

[0009] The high-temperature steam distributor is located 1-3 cm below the packing layer in the tower.

[0010] The esterification water tower top distributor is arranged on the inner wall of the tower body.

[0011] The utility model has the advantages and technical effects: through design optimization and the addition of auxiliary equipment, the original intention of improving the esterification water stripping efficiency can be achieved, while significantly reducing energy consumption and achieving the purpose of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of a stripping tower for improving the stripping efficiency of esterification water provided in an embodiment of the present invention.

[0013] Figure 2 It is a plan view of the high-temperature steam distributor provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0015] In the description of the present invention, it should be noted that the terms "upper", "middle", "lower", "inside", "outside", "both sides", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0016] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0017] like Figure 1-2As shown, the stripping tower for improving the stripping efficiency of esterified water of the present invention comprises a tower body 1, a liquid inlet pipe 15 located at the upper part of the tower body, an air inlet pipe 9 located at the lower part of the tower body, an air outlet pipe 23 located at the top of the tower body, a liquid outlet pipe 18 located at the bottom of the tower body and a packing layer 6 located in the tower body. In the tower body 1, below the outlet of the liquid inlet pipe 15 and above the packing layer 6, an esterified water tower top distributor 3 is horizontally arranged. The esterified water tower top distributor 3 is plate-shaped and has a plurality of through pipes passing through it from top to bottom. The height of the through pipes is divided into two groups, the short pipe is an esterified water distribution pipe 21, and the long pipe is a gas phase overflow pipe 22; at the outlet of the air inlet pipe 9 located at the lower part of the tower body, a high-temperature steam distributor 7 is horizontally connected, and the high-temperature steam distributor 7 is a circular ring with a plurality of through holes on the top surface; a booster fan is provided on the outside of the tower body 1, and the air outlet of the booster fan is located below the high-temperature steam distributor 7.

[0018] Preferably, the angle between the air outlet of the booster fan and the inner wall of the stripping tower is between 35-65 degrees, and the air outlet does not extend into the tower. The wind pressure is 3000-6000Pa.

[0019] Preferably, the booster fan includes a booster main fan 19 and a backup fan 20. This device is mainly used to increase the upward lifting force of the steam in the tower, improve the light component separation efficiency, and reduce steam usage and steam inlet pressure.

[0020] Preferably, the height of the gas phase overflow pipe 22 is at least twice the height of the esterified water distribution pipe 21 to ensure uniform distribution of the esterified water, increase the chance of the esterified water contacting the steam in the packing layer, and improve the heat exchange efficiency.

[0021] Preferably, the high-temperature steam distributor 7 is located 1-3 cm below the packing layer 6 in the tower.

[0022] Preferably, the esterification water tower top distributor 3 is arranged on the inner wall of the tower body 1 .

[0023] The high-temperature steam distributor 7 can maximize the dispersion effect of the steam in the tower, and can also increase the chance of the steam and esterification water contacting in the packing layer, thereby improving the heat exchange efficiency.

[0024] The working process of the stripping tower of the present invention is as follows: the esterified water 11 to be treated is pumped into the esterified water heat exchanger 14 through the esterified water feed main pump 12 or the backup pump 13 through the pipeline. After heat exchange with the esterified water after stripping, the esterified water inlet temperature is raised to a certain temperature. The heated esterified water enters the stripping tower from the top through the flow meter 8. The esterified water is distributed in the tower by the tower packing and convectively exchanges heat with the high-temperature steam in the packing to achieve the overflow of the organic light components. The organic light components overflow from the top of the tower with the steam and enter the condenser 2. The uncooled organic light components enter the organic waste gas treatment device 4 for treatment and discharge in compliance with the standards; the cooled liquid 5 returns to the esterified water storage device; the treated esterified water is cooled by the esterified water outlet main pump 16 or the backup pump 17 through the heat exchanger 14 from the bottom of the stripping tower and enters the biochemical water treatment device 10 to complete the final treatment and meet the discharge standards. The esterification water stripping efficiency is improved and the energy consumption is reduced.

[0025] Compared with the stripping unit before optimization, the optimized and adjusted stripping unit has achieved remarkable results in light component separation efficiency and energy saving and consumption reduction, as shown below:

[0026] 1. Improve the separation efficiency of organic light components

[0027] To process 9 tons of esterified water with a COD of 40,000 mg / L per day, 13.5 tons of steam were required before equipment optimization. The COD of the wastewater was 6,000 mg / L, and the steam separation efficiency was [9*40,000 - (13.5 + 9) * 6,000] / (9*40,000) = 0.625. After introducing the stripping booster fan, daily steam consumption is 9 tons, and the COD of the wastewater remains unchanged. The steam booster fan separation efficiency is [9*40,000 - (9+9) * 6,000] / (9*40,000) = 0.70. This represents a 12% efficiency improvement of (0.70 - 0.625) / 0.625 * 100%.

[0028] 2. Significantly reduce energy costs

[0029] The stripping booster fan has a power of 7kW and a wind pressure of 4000Pa. The daily power consumption is 7*24=168 kWh. Based on the local electricity price of 0.8 yuan / kWh, the investment cost is 134.4 yuan / day.

[0030] In terms of steam savings, the steam volume is reduced from the original 130℃, 13.5 tons / day to 110℃, 9 tons / day. The normal temperature water is taken at 20℃, and the calorific value of natural gas is taken as 3.6*10 4 kJ / m 3, the specific heat capacity of water is 4.2kJ / (kg·℃), the heat of vaporization of water is 2260kJ / kg, the specific heat capacity of water vapor is 2.1kJ(kg·℃), and the amount of heat that can be saved in energy per day is: [(13.5-9)*1000*(100-20)*4.2+(13.5-9)*1000*2260+(13.5-9)*1000*2.1*(110-100)+13.5*1000*2.1*(130-110)] / 3.6*104=342.875m 3 , according to 3.6 yuan / m 3 According to calculations, weather-related gas can save 1,234.35 yuan per day.

[0031] Subtracting the two costs, the daily savings is 1,099.95 yuan. Assuming a 330-day year, the annual savings is 363,000 yuan.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stripping tower for improving the stripping efficiency of esterification water, comprising a tower body (1), a liquid inlet pipe (15) located at the upper part of the tower body, an air inlet pipe (9) located at the lower part of the tower body, an air outlet pipe (23) located at the top of the tower body, a liquid outlet pipe (18) located at the bottom of the tower body, and a packing layer (6) located in the tower body, characterized in that: In the tower body (1), an esterification water tower top distributor (3) is horizontally arranged below the outlet of the liquid inlet pipe (15) and above the packing layer (6). The esterification water tower top distributor (3) is in the shape of a plate and has a plurality of through-tubes passing through it from top to bottom. The through-tubes are divided into two groups according to their heights. The short tubes are esterification water distribution pipes (21) and the long tubes are gas phase overflow pipes (22). A high-temperature steam distributor (7) is horizontally connected to the outlet of the air inlet pipe (9) located at the lower part of the tower body. The high-temperature steam distributor (7) is a circular ring with a plurality of through holes on the top surface. A booster fan is arranged on the outside of the tower body (1), and the air outlet of the booster fan is located below the high-temperature steam distributor (7).

2. The stripping tower for improving the esterification water stripping efficiency according to claim 1, characterized in that: The angle between the air outlet of the booster fan and the inner wall of the stripping tower is between 35-65 degrees, and the air outlet does not extend inside the tower.

3. The stripping tower for improving the esterification water stripping efficiency according to claim 1 or 2, characterized in that: The booster fan comprises a booster main fan (19) and a standby fan (20).

4. The stripping tower for improving the esterification water stripping efficiency according to claim 1, characterized in that: The height of the gas phase overflow pipe (22) is at least twice the height of the esterification water distribution pipe (21).

5. The stripping tower for improving the esterification water stripping efficiency according to claim 1, characterized in that: The high-temperature steam distributor (7) is located 1-3 cm below the packing layer (6) in the tower.

6. The stripping tower for improving esterification water stripping efficiency according to claim 1, characterized in that: The esterification water tower top distributor (3) is arranged on the inner wall of the tower body (1).

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