CN206355802U - A kind of hydrogen peroxide method flue gas desulfurization processing system - Google Patents

Abstract

The utility model provides a hydrogen peroxide flue gas desulfurization treatment system. The desulfurization treatment system includes a single-tower four-layer design reaction absorption tower, a hydrogen peroxide storage tank, a circulation pump, a circulation tank and a chimney; the four layers of the reaction absorption tower are the demisting layer, that is, the first layer of the absorption tower, the circulation liquid chamber That is, the second layer of the absorption tower, the absorption layer is the third layer of the absorption tower, and the gas mixing chamber is the fourth layer of the absorption tower. The desulfurization treatment system of the utility model has simple structure, convenient operation and control, and high desulfurization efficiency; and the treatment system has few supporting equipment, no need for additional operators, effectively saving investment costs, operating costs and occupied space, and can achieve desulfurization of more than 98%. High efficiency, there is no problem of crystallization tower blockage, its by-product dilute sulfuric acid does not need secondary processing, the recovery cost is low, and no new three waste products are produced during the entire production process, and there is no secondary pollution.

Description

A hydrogen peroxide flue gas desulfurization treatment system

technical field

The utility model belongs to the technical field of flue gas desulfurization, in particular to a hydrogen peroxide method flue gas desulfurization treatment system.

Background technique

As we all know, sulfur oxides and nitrogen oxides have become the main air pollutants in our country, and they have caused serious damage to the ecological environment in various forms such as acid rain and smog, and have had a great negative impact on the entire national economy. Great harm. The main source of sulfur dioxide (SO ₂ ) in China is the huge market demand for sulfuric acid in China and the sulfur dioxide discharged from the production by-products of some related industrial enterprises. The treatment of sulfur dioxide in sulfuric acid tail gas is a major issue related to environmental protection and economic benefits. The focus of China's SO ₂ emission reduction.

At present, my country's sulfuric acid industry has many methods and treatment system equipment for sulfuric acid tail gas desulfurization treatment. The methods include ammonia-acid method, ammonia method, sodium alkali method, sodium citrate method, limestone-gypsum method, activated coke method, etc. The most widely used methods are ammonia-acid method, limestone-gypsum method and activated coke method. From the perspective of industrialized desulfurization treatment systems and equipment, there are defects such as large area, high operating costs, easy blockage of absorption towers, and difficult disposal of desulfurization by-products; and the limestone-gypsum method and Due to historical reasons, its equipment still occupies an absolute dominant position. Although the desulfurization technology has undergone continuous improvement and engineering practice at home and abroad, and the existing activated coke desulfurization technology is quite mature, especially in the water-scarce western regions, the activated coke desulfurization technology should be a good choice. However, compared with the new catalytic technology, this method has the problems of easy wear, burning and agglomeration of the active coke used, high energy consumption during heating and regeneration, and high operating costs. However, the ammonia-acid desulfurization method has ammonia leakage and low desulfurization rate. The product ammonium sulfate process is long and complicated to operate. Some ammonium sulfite is also produced in the production. Ammonium sulfite itself is not very stable. Decomposition produces SO ₂ and CO ₂ , forming secondary pollution.

Patent application number 201310371346.8, titled "High-efficiency energy-saving desulfurization purification system and method for different flue gas activated coke", the desulfurization purification system includes the first adsorption desulfurization section, the second adsorption desulfurization section, the active coke regeneration section and Active coke conveying equipment; although the purification system and method have a high desulfurization rate, it has the problems of large footprint, high operating cost, and easy wear of active coke.

Patent application number 201420140181.3, a utility model patent named "Ammonia flue gas desulfurization device", its structure includes a flue, a desulfurization tower, an ammonia water circulation system and an oxidation system. In the desulfurization device, sulfur dioxide and ammonia water react to form ammonium nicotinic sulfate, which is then oxidized into ammonium sulfate through an oxidation system. The oxidation system has incomplete oxidation, which will be accompanied by some disadvantages of ammonium sulfite. Ammonium sulfite itself is not very stable. It may also be decomposed to produce SO ₂ and CO ₂ after being irradiated by sunlight or impacted, forming secondary pollution, thereby Further cause a vicious circle of environmental pollution.

Contents of the invention

The purpose of this utility model is to provide a hydrogen peroxide flue gas desulfurization treatment system aimed at the problems and deficiencies in the above-mentioned prior art. The reaction absorption tower in the desulfurization treatment system is a single-tower four-story design, and the supporting equipment of the whole treatment system is small and precise, without additional operators, which effectively saves investment costs, operating costs and floor space, and can achieve a desulfurization efficiency of over 98%. , there is no problem of crystallization tower plugging, no new three waste products are produced during the production process, and there is no secondary pollution.

In order to realize the above-mentioned purpose of the invention, the utility model adopts the technical scheme that is made up of following technical measure to realize.

A hydrogen peroxide flue gas desulfurization treatment system described in the utility model includes a reaction absorption tower, a hydrogen peroxide storage tank, a delivery pipeline, a circulation pump, a circulation tank and a chimney; wherein, the reaction absorption tower adopts a single tower four Layer design: The fourth layer is the demister layer, which is the first layer of the absorption tower. The demist layer is adjacent to the circulating liquid chamber, which is the second layer of the absorption tower. The circulating liquid chamber is adjacent to the absorption layer, which is the third layer of the absorption tower. The absorption layer is adjacent to the gas mixing chamber. The fourth floor of the absorption tower; the hydrogen peroxide storage tank is placed on the left outer side of the lower part of the reaction absorption tower, and is connected to the gas mixing chamber at the bottom of the reaction absorption tower through an input pipeline, and the gas mixing chamber is connected to the right outer circulation pump of the lower part of the reaction absorption tower, and the circulation The pump is connected to the right outer circulation tank in the middle of the reaction absorption tower, and the circulation tank is connected to the circulation liquid chamber in the reaction absorption tower. The chimney is installed outside the top of the reaction absorption tower, and the flue gas passes through the demist layer and is discharged from the chimney to the atmosphere .

In the above scheme of the utility model, the four-layer single tower of the reaction absorption tower is designed as a packed tower or an empty tower with a large opening ratio.

In the above solution of the utility model, the demisting layer, that is, the first layer of the absorption tower is equipped with a demister.

In the above scheme of the utility model, several dilute sulfuric acid solution nozzles are installed in the second layer of the absorption tower in the said circulating liquid chamber.

The hydrogen peroxide method flue gas desulfurization treatment system of the utility model is controlled by a control system of a programmable logic controller (PLC), and the control room does not need to be equipped with conventional monitoring equipment, and the monitoring and control of the device are all realized by PLC.

In the desulfurization treatment system described in the utility model, the hydrogen peroxide desulfurization activity used is strong, the reaction rate is fast, the emission concentration of sulfur dioxide is lower than 200 mg/m ³ , far below the requirements of the national standard GB26132-2010, and the desulfurization rate can reach 98 It also has high removal efficiency for nitrogen oxides, and desulfurization and denitrification can be carried out at the same time. In the desulfurization treatment system, since the reaction absorption tower adopts a single-tower four-layer design, the supporting equipment of the desulfurization treatment system is small and precise, and there is no need for additional operators, which effectively saves investment costs, operating costs and floor space. During the entire production process No new three waste products are generated, and there is no secondary pollution.

Compared with the prior art, the utility model has advantages and beneficial technical effects as follows:

1. The hydrogen peroxide method flue gas desulfurization treatment system described in this utility model adopts a single-tower four-layer design. The absorption reaction of the reaction absorption tower and the recovery of by-products are all in one tower, and the supporting equipment is small and precise, and can Strong operability, no need to add additional operators, effectively saving investment costs, operating costs and floor space.

2. A hydrogen peroxide flue gas desulfurization treatment system described in the utility model, the desulfurization by-product in the desulfurization treatment system is dilute sulfuric acid, and there is no problem of crystallization tower blockage compared with the traditional treatment system.

3. The absorption tower in the hydrogen peroxide flue gas desulfurization treatment system described in this utility model is a packed tower or an empty tower with a large opening ratio, and its system resistance is less than or equal to 600 Pa, so the power consumption of the system can be saved.

4. In the hydrogen peroxide method flue gas desulfurization treatment system described in the utility model, the dilute sulfuric acid produced is directly returned to the reaction absorption tower to adjust the acid concentration, the by-products do not need secondary processing, and the recovery cost is greatly reduced; the entire production No new three waste products are produced in the process, so there is no secondary pollution, and it is a typical clean desulfurization treatment system.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a hydrogen peroxide method flue gas desulfurization treatment system described in the present invention.

In the figure, 1 is the reaction absorption tower, 2 is the defogging layer, which is the first layer of the absorption tower, 3 is the second layer of the absorption tower, 4 is the second layer of the absorption tower, 4 is the third layer of the absorption tower, 5 is the fourth layer of the absorption tower, and 5 is the gas mixing chamber , 6 hydrogen peroxide storage tanks, 7 delivery pipes, 8 mist eliminators, 9 dilute sulfuric acid solution nozzles, 10 circulation pumps, 11 circulation tanks, and 12 chimneys.

detailed description

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but it does not mean any limitation to the protection scope of the utility model.

A hydrogen peroxide flue gas desulfurization treatment system described in the utility model has a structure as shown in Figure 1, including a reaction absorption tower 1, a hydrogen peroxide storage tank 6, a delivery pipeline 7, a circulation pump 10, a circulation tank 11 and Chimney 12; wherein, the reaction absorption tower 1 adopts a single-tower four-layer design, including the middle demister layer 2, which is the first layer of the absorption tower, and the demist layer 2 is close to the middle circulating liquid chamber 3, which is the second layer of the absorption tower, The circulating liquid chamber 3 is adjacent to the absorption layer 4 in the middle, which is the third layer of the absorption tower, and the absorption layer 4 is adjacent to the gas mixing chamber 5 at the bottom, which is the fourth layer of the absorption tower; the hydrogen peroxide storage tank 6 is placed on the left side of the lower part of the reaction absorption tower 1 The side is connected to the gas mixing chamber 5 at the bottom of the reaction absorption tower 1 through the delivery pipeline 7, and the gas mixing chamber 5 is connected to the circulation pump 10 installed outside the right side of the bottom of the reaction absorption tower 1 through the delivery pipeline 7, and the circulation pump 10 is connected through the delivery pipeline 7 is connected to the circulation tank 11 designed outside the right side of the middle part of the reaction absorption tower 1, and the circulation tank 11 is connected to several dilute sulfuric acid solution nozzles 9 installed in the circulation liquid chamber 3 in the reaction absorption tower through the delivery pipeline 7, and the demisting layer 2 A demister 8 is arranged inside, and a chimney 12 is installed on the outside of the top of the reaction absorption tower, and the flue gas in the reaction absorption tower passes through the demister layer 2 and is discharged into the atmosphere through the conveying pipeline connected to the chimney.

Example 1

This embodiment connects each instrument and equipment according to the structure of the desulfurization treatment system described in Figure 1, and utilizes the desulfurization treatment system to operate according to the following desulfurization treatment process steps and the described parameters; the whole operation process adopts the control system of a programmable logic controller (PLC). For control, the control room does not need to set up conventional monitoring equipment, and the monitoring and control of the device are all realized by PLC.

Using the hydrogen peroxide method flue gas desulfurization treatment system adopts the following process steps to remove sulfur dioxide:

(1) Adjust sulfuric acid tail gas parameters

Before the sulfuric acid tail gas enters the reaction absorption tower, adjust the temperature, pressure and oxygen content of the sulfuric acid tail gas to make the sulfuric acid tail gas meet the desulfurization requirements;

(2) Mixed gas formation

Pass the sulfuric acid tail gas with adjusted parameters in step (1) into the gas mixing chamber in the reaction absorption tower, that is, the fourth layer of the absorption tower, and send the hydrogen peroxide in the hydrogen peroxide storage tank into the gas mixing chamber in the reaction absorption tower through the delivery pipeline After decomposing to produce water and oxygen, the produced oxygen and sulfuric acid tail gas are mixed and contacted in the gas mixing chamber in the reaction absorption tower to form a mixed gas containing sulfur trioxide;

(3) Removal of sulfur dioxide

The mixed gas formed in step (2) and the dilute sulfuric acid solution in the second layer of the absorption tower are sprayed with the circulating liquid chamber in the reaction absorption tower, which is the third layer of the absorption tower. After mixing and contacting, the sulfuric acid tail gas after contact is dissolved in dilute sulfuric acid and falls into the bottom of the reaction absorption tower, at which time sulfur dioxide is removed; The circulating tank outside the tower is then sent to the circulating liquid chamber;

(4) Recycling of dilute sulfuric acid solution

The dilute sulfuric acid solution produced in step (3) is discharged from the bottom of the reaction absorption tower through the delivery pipeline to the circulation tank by the circulation pump; the concentration of the dilute sulfuric acid in the circulation tank is adjusted, and when the concentration reaches 2.90%, it is circulated back to the reaction absorption The dilute sulfuric acid solution in the circulating liquid chamber in the tower is then sprayed down by the dilute sulfuric acid solution nozzle and mixed with the mixed gas in the absorption layer in the reaction absorption tower to mix and contact; the process of the above step (3) is circulated to achieve the removal of sulfur dioxide;

(5) Up to the standard flue gas is discharged into the atmosphere

After the sulfuric acid tail gas is purified by steps (1)-(4), it passes through the demister layer in the reaction absorption tower, that is, the demister installed on the first layer of the absorption tower is dewatered and dried, and the flue gas that reaches the emission standard passes through the top of the reaction absorption tower. The connected delivery pipe is sent to the chimney for discharge to the atmosphere.

In this embodiment, the sulfur dioxide content of the sulfuric acid tail gas intake is 1600mg/ ^Nm3 , the temperature of the sulfuric acid tail gas is adjusted to 60°C, the inlet pressure is 1500Pa, the oxygen content is 4%, and the concentration of the hydrogen peroxide solution absorbent used is 0.1%.

The used reaction absorption tower parameter is the packed tower of reaction absorption tower diameter D=4.8m, and height H=15.5m; The circulation pump used is two sets of 904L horizontal centrifugal pumps with a lift length of 30m and a flow rate of 300m ³ /h (one with One preparation); the transmission pipeline used is made of glass fiber reinforced plastic or stainless steel.

The specific operation process and steps of using the desulfurization treatment system to remove sulfur dioxide in this embodiment are as follows:

(1), adjust sulfuric acid tail gas parameters

Pass the sulfuric acid tail gas with adjusted parameters into the gas mixing chamber 5 at the bottom of the reaction absorption tower 1, which is the fourth layer of the absorption tower;

(2), mixed gas formation

Its concentration that is stored in the hydrogen peroxide storage tank 6 is that the hydrogen peroxide solution absorbent of 27.5% is transported to the gas mixing chamber 5 at the bottom of the reaction absorption tower 1 through the delivery pipeline 7, and decomposes to produce water and oxygen, and step 1 feeds After the sulfuric acid tail gas and oxygen are mixed and contacted in the gas mixing chamber 5, a mixed gas containing sulfur trioxide is generated;

(3), removal of sulfur dioxide

The dilute sulfuric acid solution sprayed down by the mixed gas in the step (2) and the circulating liquid chamber 3 in the reaction absorption tower 1, that is, the dilute sulfuric acid solution nozzle 9 on the second floor of the absorption tower, is in the reaction absorption tower 1 absorption layer 4, that is, the absorption tower The third layer is mixed and contacted, the sulfuric acid tail gas after contact is dissolved in dilute sulfuric acid and falls into the bottom of reaction absorption tower 1, and the sulfuric acid tail gas after contact is dissolved in dilute sulfuric acid with a volume ratio of 1:40, and sulfur dioxide is removed at this time; The dilute sulfuric acid solution is produced by the desulfurization treatment system, and is transported to the circulation tank 11 outside the middle part of the reaction absorption tower by the circulation pump 10 outside the bottom of the reaction absorption tower through the delivery pipeline 7, and then delivered to the circulation liquid chamber 3 through the delivery pipeline;

(4) Recycling of dilute sulfuric acid solution

The dilute sulfuric acid solution described in step (3) is discharged into the circulation tank 11 from the bottom of the reaction absorption tower 1 through the circulation pump 10; the concentration of the dilute sulfuric acid in the circulation tank 11 is adjusted, and when the concentration is adjusted to 2.90%, the circulation is refluxed The dilute sulfuric acid solution to the circulating liquid chamber 3 in the reaction absorption tower 1 is then sprayed through the dilute sulfuric acid solution nozzle and mixed with the mixed gas in the absorption layer 4 of the reaction absorption tower, and the process of the above step 3 is circulated to circulate in the reaction absorption tower. The concentration of sulfuric acid in the liquid chamber 3 is kept within 20% to achieve the acid concentration required for absorption; thereby achieving the removal of sulfur dioxide;

(5) Up to the standard flue gas is discharged into the atmosphere

After the sulfuric acid tail gas is purified by steps (1)-(4), it passes through the demister layer 2 in the reaction absorption tower, that is, the demister 8 installed in the first layer of the absorption tower is dewatered and dried, and the flue gas that reaches the emission standard is reacted The delivery pipeline connected to the top of the absorption tower 1 is sent into the chimney and discharged into the atmosphere.

When the utility model carries out the desulfurization and denitrification operation through the desulfurization treatment process and desulfurization treatment system of Example 1, the absorbent used is 27.5% hydrogen peroxide solution, and the concentration of the dilute sulfuric acid solution is controlled at not less than 2.90%, and the reaction absorbs The final concentration of hydrogen peroxide in the absorption layer 4 of tower 1 is 0.1%, the concentration of sulfuric acid in the absorption layer is kept at 20%, the inlet temperature of the sulfuric acid tail gas is 60°C, the pressure is 1500Pa, and the sulfur dioxide content of the inlet gas of the sulfuric acid tail gas is 1600mg/ ^Nm3 . After being treated by the desulfurization system, the concentration of sulfur dioxide is less than 200mg/Nm ³ , and the desulfurization rate is greater than 98%.

Example 2

This embodiment also connects each instrument and equipment according to the structure shown in Figure 1, and the instruments and equipment used, the operation process and the steps are the same as in Example 1, and the difference from Example 1 is that the inlet temperature of the sulfuric acid tail gas is 70°C , hydrogen peroxide solution absorbent concentration is 0.5% in the absorption layer 4 of reaction absorption tower 1, and sulfuric acid concentration remains on 25% in the absorption layer, and other used parameters are all identical with embodiment 1. After being treated by the desulfurization system, the concentration of sulfur dioxide is less than 200mg/Nm ³ , and the desulfurization rate is greater than 98%.

Example 3

This embodiment also connects each instrument and equipment according to the structure shown in Figure 1, and the instrument and equipment used, the operation process and the steps are the same as in Example 1, the difference is that the inlet temperature of the sulfuric acid tail gas is 80 ° C, and the reaction absorption tower 1 The hydrogen peroxide solution absorbent concentration in the absorption layer 4 is 1%, and the sulfuric acid concentration in the absorption layer 4 is maintained at 30%. After being treated by the desulfurization system, the concentration of sulfur dioxide is less than 200mg/Nm ³ , and the desulfurization rate is greater than 98%.

Claims (4)

1. a kind of hydrogen peroxide method flue gas desulfurization processing system, it is characterised in that including reactive absorption tower (1), hydrogen peroxide storage Tank (6), conveyance conduit (7), circulating pump (10), circulating slot (11) and chimney (12)；Wherein, the reactive absorption tower (1) is single Four layers of tower：There is demisting layer (2) i.e. absorption tower first layer, demisting floor is the absorption tower second layer, circulation fluid room close to circulation fluid room (3) Be absorption tower third layer close to absorbed layer (4), absorbed layer close to gas mixer chamber (5) be the 4th layer of absorption tower；The peroxidating Storing hydrogen tank is placed in reactive absorption tower bottom left-external side, is connected by input channel (7) and reactive absorption tower bottom gas mixer chamber Connect, gas mixer chamber is connected with circulating pump (10) on the outside of reactive absorption tower lower right, circulating pump and the right side in the middle part of reactive absorption tower are outer Side circulating slot (11) is connected, and circulation fluid room in circulating slot coupled reaction absorption tower, the chimney (12) is installed on reactive absorption tower Top outer, flue gas after demisting layer through conveyance conduit by being emitted into air.

2. a kind of hydrogen peroxide method flue gas desulfurization processing system according to claim 1, it is characterised in that the reactive absorption Four layers of the single column of tower (1) is designed as large opening rate packed tower or void tower.

3. a kind of hydrogen peroxide method flue gas desulfurization processing system according to claim 1 or claim 2, it is characterised in that the demisting layer (2) it is that demister (8) is installed in the first layer of absorption tower.

4. a kind of hydrogen peroxide method flue gas desulfurization processing system according to claim 1 or claim 2, it is characterised in that the circulation fluid Room (3) is to be provided with some dilution heat of sulfuric acid shower nozzles (9) in the second layer of absorption tower.