CN206082145U - A wet desulfurization system - Google Patents

Abstract

The utility model provides a wet flue gas desulfurization system relates to the flue gas purification field. The utility model comprises a flue gas system, a slurry preparation system, a desulfurizing tower system and a slurry discharging and dewatering system; the flue gas system comprises an electric dust collector, an induced draft fan, a semi-dry desulfurization tower and a bag-type dust collector, wherein the electric dust collector, the induced draft fan, the semi-dry desulfurization tower and the bag-type dust collector are sequentially connected; the desulfurizing tower system comprises an absorption tower, and the absorption tower is connected with the bag-type dust remover; the slurry preparation system comprises a lime powder bin and a slurry pool, the slurry pool is connected with the absorption tower, and the lime powder bin is connected with the slurry pool; the slurry discharging and dewatering system comprises a filter press, and the filter press is connected with the absorption tower. The utility model combines the limestone powder spraying in the furnace and the wet desulphurization outside the furnace, SO₂The discharge can reach 100mg/m³The emission standard requirement, and can reduce the material consumption of the desulfurization system to the maximum extent, improve the production efficiency and greatly improve the economic benefit.

Description

A wet desulfurization system

technical field

The utility model relates to the field of flue gas purification, in particular to a wet desulfurization system.

Background technique

At present, the problem of environmental pollution has been widely concerned by all walks of life, especially the problem of air pollution. In order to meet the country's emission requirements for SO ₂ , many enterprises have adopted corresponding desulfurization measures. At present, the commonly used flue gas desulfurization methods suitable for small and medium-sized boilers mainly include calcium pot double alkali method, lime method, limestone method, magnesium oxide method and other wet methods, but basically the desulfurization rate can only reach about 90%.

A wet desulfurization device is patented (authorized announcement number: CN 204563925 U), which discloses a wet desulfurization device, including a shell with a flue gas inlet and a flue gas outlet, and a storage tank for storing desulfurization slurry at the bottom of the shell. The active slurry pool, the desulfurization spraying device arranged above the active slurry pool and connected to it for introducing and spraying the desulfurization slurry, the flue gas inlet is located below the desulfurization spraying device, and the flue gas outlet is located above the desulfurization spraying device, The wet desulfurization device also includes a bubbling fluidized bed arranged below the desulfurization spray device and above the flue gas inlet, and communicated with the active slurry pool to store and deliver chemical additives to the desulfurization slurry to improve its chemical reactivity. Additive reservoir. By adding a small amount of chemical additives, the dissolution of limestone is improved, the liquid-gas ratio is reduced to reduce the amount of slurry spraying, and the bubbling and crushing of the bubbling fluidized reaction bed is used to self-purify the flue gas to achieve higher desulfurization efficiency. However, the addition of chemical additives still causes certain pollution to equipment and the environment, and the process is more complicated.

Utility model content

In order to solve the above technical problems, the utility model provides a wet desulfurization system with reduced system material consumption, low production cost and high utilization rate of desulfurization absorbent.

The utility model provides the following technical solutions:

A wet desulfurization system, including a flue gas system, a slurry preparation system, a desulfurization tower system, and a slurry discharge and dehydration system; the flue gas system includes an electric dust collector, an induced draft fan, a semi-dry desulfurization tower, and a bag filter. The electrostatic precipitator, induced draft fan, semi-dry desulfurization tower and bag filter are connected in sequence; the desulfurization tower system includes an absorption tower, and the absorption tower is connected with the bag filter; the slurry preparation system includes a lime powder bin and the slurry pool, the slurry pool is connected with the absorption tower, the lime powder bin is connected with the slurry pool; the slurry discharge and dehydration system includes a filter press, and the filter press is connected with the absorption tower .

Preferably, the absorption tower is provided with a demister system and an oxidation circulation system, the demist system is located at the top of the absorption tower, and the oxidation circulation system is located at the bottom of the absorption tower.

Preferably, the demister system includes a spray device and a mist eliminator, both of the spray device and the demister are arranged at the top of the absorption tower, and the demister is located at the top of the spray device above.

Preferably, the spraying devices are provided with 2-6 layers, and the spraying devices are arranged in a staggered manner to ensure uniform distribution of droplets.

Preferably, the demister is also equipped with a flushing device, which can regularly flush the demister to prevent fouling of the demister.

Preferably, the oxidation circulation system includes an oxidation tank, a circulation pump and a discharge pump, the oxidation tank is located at the bottom of the absorption tower, the circulation pump and the discharge pump are both arranged outside the absorption tower, and the circulation pump and the discharge pump The pumps are respectively connected with the oxidation pools.

Preferably, a vertical agitator is provided above the slurry pool, which can continuously stir the slurry and prevent the slurry from settling.

Preferably, a straight chimney is also provided at the top of the absorption tower.

The utility model adopts lime powder as the desulfurization absorbent, powdered lime and water are mixed and stirred to make absorption slurry, the flue gas from the boiler is dedusted by the electric precipitator, pressurized by the induced draft fan and passed through the original semi-dry method Desulfurization tower, after being dedusted by the bag filter, enters the entrance area of the absorption tower, enters the tower body from the upper part of the oxidation pool in the tower, and in the absorption tower, the flue gas flows upstream and contacts the absorption slurry from top to bottom , the SO2 in the flue gas _reacts with the calcium carbonate in the slurry and the oxidized air blown in to be removed by chemical reaction, and the final reaction product is gypsum. The desulfurized flue gas is discharged from the straight chimney at the top of the absorption tower after the fine liquid droplets are removed by the mist eliminator. The desulfurized gypsum slurry is filtered and dehydrated by a filter press to form a gypsum cake, and the dehydrated by-products are transported out of the factory by car. The absorption slurry is recycled through the circulation pump, and the utilization rate of the desulfurization absorbent is very high.

The beneficial effects of the utility model are: adopting the measures of combining limestone powder spraying in the furnace and wet desulfurization outside the furnace, the SO ₂ emission can reach the emission standard requirement of 100 mg/m ³ , the technological process and equipment layout are compact, and can maximize the Reducing the material consumption and energy of the desulfurization system not only improves the production efficiency, but also greatly improves the economic benefits.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, and are used to explain the utility model together with the embodiments of the utility model, and do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is a structural representation of the utility model;

Marked in the figure: 1. Electrostatic precipitator; 2. Induced fan; 3. Semi-dry desulfurization tower; 4. Bag filter; 5. Absorption tower; 51. Oxidation pool; 52. Mist eliminator; 53. Spray 6. Circulation pump; 7. Discharge pump; 8. Lime powder bin; 9. Slurry pool; 10. Filter press; 11. Straight chimney; 12. Vertical mixer.

detailed description

Describe preferred embodiment of the present utility model below in conjunction with accompanying drawing.

As shown in Figure 1, a wet desulfurization system of the utility model includes a flue gas system, a slurry preparation system, a desulfurization tower system, and a slurry discharge and dehydration system; the flue gas system includes an electric dust collector 1, an induced draft fan 2, a semi- Dry desulfurization tower 3 and bag filter 4, electrostatic precipitator 1, induced draft fan 2, semi-dry desulfurization tower 3 and bag filter 4 are connected in sequence; the desulfurization tower system includes absorption tower 5, absorption tower 5 and bag filter 4 The slurry preparation system includes a lime powder bin 8 and a slurry pool 9, the slurry pool 9 is connected to the absorption tower 5, and the lime powder bin 8 is connected to the slurry pool 9; the slurry discharge and dehydration system includes a filter press 10, and the filter press 10 is connected to the slurry pool 9. The absorption tower 5 is connected.

The absorption tower 5 is provided with a mist removal system and an oxidation circulation system, the mist removal system is located at the top of the absorption tower 5 , and the oxidation circulation system is located at the bottom of the absorption tower 5 .

The mist removal system includes a spray device 53 and a mist eliminator 52 , the spray device 53 and the mist eliminator 52 are arranged at the top of the absorption tower 5 , and the mist eliminator 52 is located above the spray device 53 .

There are 2-6 layers of spraying devices 53, and the spraying devices 53 are arranged in a staggered manner to ensure uniform distribution of droplets.

The demister 52 is also provided with a flushing device, which can regularly flush the demister to prevent fouling of the demister.

Oxidation circulation system comprises oxidation pond 51, circulation pump 6 and discharge pump 7, and oxidation pond 51 is positioned at the bottom in absorption tower 5, and circulation pump 6 and discharge pump 7 are all arranged outside absorption tower 5 and circulation pump 6 and discharge pump 7 all respectively It is connected with the oxidation pool 51.

A vertical agitator 12 is also provided above the slurry tank 9, which can continuously stir the slurry to prevent the slurry from settling.

The top of the absorption tower 5 is also provided with a straight chimney 11 .

The working mode of the utility model: lime powder is used as the desulfurization absorbent, powdered lime is mixed with water to make absorption slurry, the flue gas from the boiler is dedusted by the electrostatic precipitator 1, and then pressurized by the induced draft fan 2 After passing through the original semi-dry desulfurization tower 3, and then passing through the bag filter 4 to remove dust, it enters the entrance area of the absorption tower 5, enters the tower body from the upper part of the oxidation pool 51 in the tower, and in the absorption tower 5, the flue gas flows countercurrently. While the top is in contact with the absorption slurry from top to bottom, the SO2 in the flue gas _reacts with the calcium carbonate in the slurry and the oxidized air blown in to be removed by chemical reaction, and the final reaction product is gypsum. The desulfurized flue gas is discharged from the straight chimney at the top of the absorption tower after passing through the mist eliminator 52 to remove fine liquid droplets. The desulfurized gypsum slurry is filtered and dehydrated by the filter press 10 to form a gypsum cake, and the dehydrated by-products are transported out of the factory by car. The absorption slurry is recycled through the circulation pump 6, and the utilization rate of the desulfurization absorbent is very high.

The above description is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it can still understand the aforementioned The technical solutions described in each embodiment are modified, or some of the technical features are equivalently replaced. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (8)

1. A wet desulfurization system, characterized in that it comprises a flue gas system, a slurry preparation system, a desulfurization tower system, and a slurry discharge and dehydration system; The flue gas system includes an electrostatic precipitator, an induced draft fan, a semi-dry desulfurization tower and a bag filter, and the electrostatic precipitator, an induced draft fan, a semi-dry desulfurization tower and a bag filter are connected in sequence; The desulfurization tower system includes an absorption tower, and the absorption tower is connected with the bag filter; The slurry preparation system includes a lime powder bin and a slurry pool, the slurry pool is connected to the absorption tower, and the lime powder bin is connected to the slurry pool; The slurry discharge and dehydration system includes a filter press connected to the absorption tower. 2. A wet desulfurization system according to claim 1, characterized in that, the absorption tower is provided with a demister system and an oxidation circulation system, the demist system is located at the top of the absorption tower, and the oxidation circulation system Located at the bottom of the absorption tower. 3. A wet desulfurization system according to claim 2, characterized in that the demister system includes a spray device and a demister, and the spray device and the demister are both arranged on the At the top of the absorption tower, the demister is located above the spraying device. 4. A wet desulfurization system according to claim 3, characterized in that the spraying devices are provided with 2-6 layers, and the spraying devices are arranged in a staggered manner. 5. A wet desulfurization system according to claim 3, characterized in that a flushing device is also provided on the demister. 6. A wet desulfurization system according to claim 2, characterized in that the oxidation cycle system comprises an oxidation pool, a circulation pump and a discharge pump, the oxidation pool is located at the bottom of the absorption tower, and the cycle Both the pump and the discharge pump are arranged outside the absorption tower, and both the circulation pump and the discharge pump are respectively connected to the oxidation tank. 7. A wet desulfurization system according to claim 1, characterized in that a vertical agitator is provided above the slurry pool. 8. A wet desulfurization system according to claim 1, characterized in that a straight chimney is provided at the top of the absorption tower.