CN210559384U

CN210559384U - Efficient sulfur trioxide absorption tower system

Info

Publication number: CN210559384U
Application number: CN201921028716.7U
Authority: CN
Inventors: 王伟
Original assignee: Fujian Shen Yuanxin Material Co ltd
Current assignee: Fujian Shen Yuanxin Material Co ltd
Priority date: 2019-07-03
Filing date: 2019-07-03
Publication date: 2020-05-19
Anticipated expiration: 2029-07-03

Abstract

The utility model provides a high-efficiency sulfur trioxide absorption tower system, which comprises an absorption tower body, a high-temperature 98 percent sulfuric acid circulating tank, a steam generator and a mixer, wherein the lower half section of the absorption tower body is provided with a first-stage spray head and a first-stage packing layer, and the first-stage spray head is positioned above the first-stage packing layer; the upper half section of the absorption tower body is provided with a secondary spray head and a secondary packing layer, and the secondary spray head is positioned above the secondary packing layer; a sulfur trioxide inlet is formed below the absorption tower body; the lower part of the absorption tower body is connected with a high-temperature 98% sulfuric acid circulating tank, the high-temperature 98% sulfuric acid circulating tank is connected with a steam generator through a sulfuric acid circulating pump, the steam generator is connected to a primary spray head through a mixer, and the steam generator is also connected to a drying 98% sulfuric acid circulating tank through a feed water heater; the secondary spray head is connected with a 98% sulfuric acid circulating tank of the dry-suction section. The utility model discloses a second grade absorption tower structure, it is big to have absorption acid circulation volume, and the input equipment is few, and the absorption effect is good, advantage such as efficient.

Description

Efficient sulfur trioxide absorption tower system

[ technical field ] A method for producing a semiconductor device

The utility model particularly relates to a high-efficient sulfur trioxide absorption tower system.

[ background of the invention ]

The pollution of the sulfuric acid industry mainly comes from sulfur dioxide in a conversion section and sulfur trioxide in an absorption section in the production process, and tail gas sulfuric acid mist (mainly sulfur trioxide) hardly reaches the national emission standard. For the absorption of sulfur trioxide, the conventional treatment method usually uses 98% sulfuric acid for single-stage absorption, however, the above method has the main problems that the absorption efficiency is not high, and sulfur trioxide cannot be completely absorbed, so that the final emission of sulfur trioxide exceeds the national emission standard, and environmental pollution is easily caused.

Chinese patent document CN202164117U discloses a sulfur trioxide absorption reaction device, including sulfur trioxide gas storage tower, reaction tower, drawing liquid pump, the side is provided with the air inlet on the reaction tower, and the air inlet of reaction tower and sulfur trioxide gas storage tower pass through the pipeline intercommunication, the reaction tower top is provided with the sulphuric acid inlet, to the sprinkler head that sprays in the reaction tower, and the bottom is provided with liquid outlet, returns the liquid mouth, the drawing liquid pump inlet passes through the pipeline intercommunication with the liquid mouth that returns of reaction tower, and the drawing liquid pump liquid outlet passes through the pipeline intercommunication with the sprinkler head of reaction tower.

The invention discloses a two-stage absorption process and equipment of a fuming sulfuric acid system, and relates to the two-stage absorption process and equipment of the fuming sulfuric acid system, belonging to the technical field of chemical processes. The utilization has the nicotinic acid tower of two-stage absorption tower, the sulfur trioxide that will make acid workshop section converter three-section and come out enters the first order absorption tower of nicotinic acid tower earlier, then get into the second grade absorption tower, remaining sulfur trioxide gas gets into first absorption tower, it is first in nicotinic acid tower, adopt nicotinic acid circulation absorption sulfur trioxide gas in the second grade absorption tower, nicotinic acid behind the absorption sulfur trioxide gas gets into dense nicotinic acid circulation groove, weak nicotinic acid circulation groove respectively according to the height of concentration, carry out nicotinic acid circulation absorption and nicotinic acid evaporation. By implementing secondary absorption, the absorption rate of sulfur trioxide is improved from 50-55% to 60-65%, and the yield of sulfur trioxide is increased by 7000 tons all year round. The yield of the chlorosulfonic acid can be increased by 10000 tons.

However, when the two sulfur trioxide absorption towers are used for absorbing sulfuric acid sulfur trioxide, the absorption efficiency is low due to single-stage absorption, sulfur trioxide cannot be completely absorbed, and the requirement of sulfur trioxide environmental-friendly emission cannot be met. Chinese patent document CN201010003826 discloses a two-stage absorption process and equipment for a fuming sulfuric acid system, which is used for fuming sulfuric acid, two types of sulfuric acid products which are not communicated need to be produced, two acid circulation tanks and a sulfuric acid circulation pump need to be configured, and two finished product outlets are arranged on a fuming sulfuric acid tower.

[ Utility model ] content

The utility model aims to solve the technical problem that a high-efficient sulfur trioxide absorption tower system is provided, and it is grade absorption tower structure, and it is big to have absorption acid circulation volume, and the input equipment is few, and the absorption effect is good, advantage such as efficient.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

a high-efficiency sulfur trioxide absorption tower system comprises an absorption tower body, a high-temperature 98% sulfuric acid circulating tank, a steam generator and a mixer, wherein a first-stage spray head and a first-stage packing layer are arranged at the lower half section of the absorption tower body, and the first-stage spray head is positioned above the first-stage packing layer; the upper half section of the absorption tower body is provided with a secondary spray head and a secondary packing layer, and the secondary spray head is positioned above the secondary packing layer; a sulfur trioxide inlet is formed below the absorption tower body; the lower part of the absorption tower body is connected with a high-temperature 98% sulfuric acid circulating tank, the high-temperature 98% sulfuric acid circulating tank is connected with a steam generator through a sulfuric acid circulating pump, the steam generator is connected to a primary spray head through a mixer, and the steam generator is also connected to a drying 98% sulfuric acid circulating tank through a water supply heater; the secondary spray head is connected with a 98% sulfuric acid circulating tank of the dry-suction section.

The utility model has the advantages as follows:

1. 2-stage absorption is adopted, so that the circulation amount of the absorption acid is large, the absorption effect is good, and the efficiency is high.

2. Recovering SO which can not be absorbed in 1-stage absorption flue gas₃The product sulfuric acid is obtained, and waste is changed into valuable.

3. The absorption liquid is sulfuric acid and water are added for recycling, the treatment cost is greatly reduced, and no wastewater is generated.

[ description of the drawings ]

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

Figure 1 is a schematic diagram of the high efficiency sulfur trioxide absorption tower system of the present invention.

[ detailed description ] embodiments

Referring to fig. 1, the utility model relates to a high-efficiency sulfur trioxide absorption tower system, which comprises an absorption tower body 1, a high-temperature 98% sulfuric acid circulation tank 2, a steam generator 3 and a mixer 4, wherein the lower half section of the absorption tower body 1 is provided with a first-stage spray head 11 and a first-stage packing layer 12, and the first-stage spray head 11 is positioned above the first-stage packing layer 12; the upper half section of the absorption tower body 1 is provided with a secondary spray head 13 and a secondary packing layer 14, and the secondary spray head 13 is positioned above the secondary packing layer 14; a sulfur trioxide inlet 15 is formed below the absorption tower body 1; the lower part of the absorption tower body 1 is connected with a high-temperature 98% sulfuric acid circulating tank 2, the high-temperature 98% sulfuric acid circulating tank 2 is connected with a steam generator 3 through a sulfuric acid circulating pump 21, the steam generator 3 is connected to a primary spray head 11 through a mixer 4, and the steam generator 3 is also connected to a drying 98% sulfuric acid circulating tank 6 through a water supply heater 5; the secondary spray head 13 is connected with a 98% sulfuric acid circulating tank 7 of a dry absorption section.

The working process of the utility model is as follows:

the sulfuric acid in the high-temperature 98% sulfuric acid circulating tank 2 is sent to a steam generator 3 through a sulfuric acid circulating pump 21, low-pressure steam is generated and sent to a steam pipe network, and meanwhile, the high-temperature acid at 180 ℃ is reduced to 160 ℃; then the mixture is divided into two paths, one path enters a mixer 4 and is mixed with water to generate high-temperature acid, the high-temperature acid enters a first-stage spray head 11 of an absorption tower body 1 to be sprayed for 1 time, and the spraying flow is 400m³H, absorbing SO entering the absorption tower body 1 from the sulfur trioxide inlet 15₃Gas, SO₃Absorption rate was 98.5%, and residual SO₃The gas continuously enters the upper half section of the absorption tower body 1; 98 percent sulfuric acid introduced from a 98 percent sulfuric acid circulating tank 7 of a dry absorption section enters a secondary spray head 13 for 2 times of spraying absorption, and the spraying flow is 30m³H, absorbing the residual smoke after the primary spray head 11 spraysSulfur trioxide gas, SO by twice spray absorption₃The total absorption was 99.8%. The other path of the sulfuric acid from the steam generator 3 passes through a feed water heater 5 to obtain a finished product of 98 percent sulfuric acid, and the finished product of 98 percent sulfuric acid is completely sent into a drying 98 percent sulfuric acid circulating tank 6.

The present invention will be further described with reference to the following specific examples.

Examples

The utility model relates to a high-efficient sulfur trioxide absorption tower system, which is used by far-reaching new material company Limited sulfuric acid devices in Fujian province. The main process parameters and characteristics are as follows:

a40-kiloton sulfuric acid device is newly built by Fujian Shen New material limited company, the high-efficiency sulfur trioxide absorption tower system is used for feeding production in 7 months in 2017, and the practical operation of more than 1 year shows that the absorption condition is good, and SO is contained in the gas₃The absorption is complete, the equipment operation is stable, and the safety guarantee is provided for the stable operation of the sulfuric acid system.

The utility model has the advantages as follows:

It is to be understood that the specific embodiments described are merely illustrative of and not restrictive on the broad invention, and that modifications and variations such as would be obvious to those skilled in the art are intended to be included within the scope of the invention defined by the appended claims.

Claims

1. A high-efficient sulfur trioxide absorption tower system which characterized in that: the absorption tower system comprises an absorption tower body, a high-temperature 98% sulfuric acid circulating tank, a steam generator and a mixer, wherein a first-stage spray head and a first-stage packing layer are arranged at the lower half section of the absorption tower body, and the first-stage spray head is positioned above the first-stage packing layer; the upper half section of the absorption tower body is provided with a secondary spray head and a secondary packing layer, and the secondary spray head is positioned above the secondary packing layer; a sulfur trioxide inlet is formed below the absorption tower body; the lower part of the absorption tower body is connected with a high-temperature 98% sulfuric acid circulating tank, the high-temperature 98% sulfuric acid circulating tank is connected with a steam generator through a sulfuric acid circulating pump, the steam generator is connected to a primary spray head through a mixer, and the steam generator is also connected to a drying 98% sulfuric acid circulating tank through a water supply heater; the secondary spray head is connected with a 98% sulfuric acid circulating tank of the dry-suction section.