CN201609621U - Spray tower for gas dry dedusting - Google Patents

Abstract

A spray tower for gas dry dedusting, which includes a tower body, a gas inlet connected to a gas pipeline on one side, a gas outlet on the top of the tower body; at least two layers of packing layers are arranged on the upper part of the tower body, and a drainage bucket is arranged on the lower part of the tower body ; at least three layers of water spray structure, each layer of water spray structure includes an annular water pipe, a number of spray guns arranged on the annular water pipe; the annular water pipe ring is set outside the tower body, and the water spray end of the spray gun passes through the corresponding tower body of the tower body; each annular water pipe The water supply pipes are respectively connected; the water supply pipes are provided with flowmeters and control valves; the drainage sealing tank is arranged on the drainage side of the tower body, and is connected to the drainage bucket at the lower part of the tower body through pipes. The utility model solves the bad influence of the disadvantages of the gas dry dedusting process on the clean gas pipeline and subsequent gas user equipment.

Description

Spray tower for gas dry dedusting

technical field

The utility model relates to gas purification equipment, in particular to a spray tower suitable for dry dust removal of extra-large blast furnace gas.

Background technique

Blast furnace gas is an important by-product of blast furnace ironmaking and serves as an inexpensive and efficient fuel for other processes in iron and steel complexes. Blast furnace gas enters the gravity dust collector from the furnace top ascending pipe through the downcomer, and about 40% of the large particle dust in the crude gas remains in the gravity dust collector and is discharged through the ash discharger. The initially treated raw gas enters the subsequent gas purification process equipment for treatment, and the dust content of the treated clean gas is required to be less than 5mg/NM ³ .

The existing gas purification process equipment is divided into two categories, one is the gas wet cleaning process, the typical one is the Shuangwen scrubber, and the ring seam scrubbing process is currently used more. The other is the gas dry dedusting process, the most commonly used is bag dedusting.

Gas wet cleaning and gas dry dedusting processes have their own advantages and disadvantages:

The gas wet cleaning system has relatively low equipment maintenance costs and a small maintenance workload, but the entire gas wet cleaning system occupies a large area and requires multiple high-power water pumps to supply water continuously, consuming a lot of industrial fresh water, and cleaning the gas. Water treatment is difficult, the sludge conveying pipeline is easy to wear and block, and the operating cost is high. After the high-temperature gas is cleaned, the sensible heat decreases significantly, which reduces the power generation capacity of the residual pressure power generation system. Moreover, the content of mechanical water and dust in the gas after wet cleaning is much higher than that of dry dust removal, which is not conducive to the use of gas users.

The coal gas dry dust removal system generally occupies a small area, consumes less industrial fresh water, the dust content of the gas after dust removal is low, the gas temperature is high, and the power generation capacity of the residual pressure power generation system is high. The disadvantage is that the equipment maintenance cost is higher in the later period, especially fatal is that harmful ions such as chloride ions and sulfate ions in the gas after dedusting still remain in the gas, and acidic corrosive media will be formed due to the precipitation of gas condensate in the low-temperature gas pipeline section. Damage to gas pipelines and gas user equipment.

From the perspective of energy saving and environmental protection, the gas dry dedusting process is gradually becoming the preferred process for large-scale blast furnace gas purification, and its own process defects are also constantly highlighted.

Contents of the invention

The purpose of this utility model is to design a spray tower for gas dry dedusting, so as to solve the adverse effects of the drawbacks of the gas dry dedusting process on the clean gas pipeline and subsequent gas user equipment.

In order to achieve the above object, the technical scheme of the utility model:

A spray tower for gas dry dust removal, which includes a tower body, a gas inlet connected to a gas pipeline on one side, a gas outlet on the top of the tower body; at least two layers of packing layers are arranged on the upper part of the tower body, and a drainage bucket is arranged on the lower part of the tower body ; at least three layers of water spray structure, each layer of water spray structure includes an annular water pipe, a number of spray guns arranged on the annular water pipe; the annular water pipe ring is set outside the tower body, and the water spray end of the spray gun passes through the corresponding tower body of the tower body; each annular water pipe The water supply pipes are respectively connected; the water supply pipes are provided with flowmeters and control valves; the drainage sealing tank is arranged on the drainage side of the tower body, and is connected to the drainage bucket at the lower part of the tower body through pipes.

Further, the inner diameter of the tower body is three times the inner diameter of the gas pipeline.

Also, the spray gun is connected to the spray tower body through a flange.

The annular water pipes are respectively provided with control valves.

A U-shaped water seal pipe is arranged on the water supply pipeline.

The tower is designed with a self-supporting structure that can be stably installed on the foundation.

In addition, the tower body described in the utility model is also provided with a maintenance manhole for inspection of the interior and replacement of fillers.

The water supply pipeline is connected to a pool, and the pool is provided with an electronic water level gauge and a water pump.

In the spray tower of the present utility model,

A flow meter is installed on the water supply pipeline, and the water supply can be adjusted through the manual valve according to the operation effect, and the most economical operation is performed on the basis of ensuring that the clean gas composition is qualified.

The drainage side of the spray tower is equipped with a drainage sealing tank to meet the sealing and drainage requirements of low-pressure gas.

The pool of the spray tower is equipped with an electronic water level gauge, and three water pumps are installed beside the pool, which can control the start and stop of the water pump according to the setting of the water level, so that the whole system is in an automatic operation state.

The inner diameter of the tower body is three times the inner diameter of the gas pipeline, which ensures that the gas flow rate is low and can be fully mixed with the spray atomized water.

The spray tower is equipped with three layers of spray guns. The number and length of the spray guns in each layer are different. The sprayed mist water can cover the entire inner surface of the spray tower to prevent the short circuit of the gas flow from affecting the washing effect.

The spray gun is connected to the spray tower body through the flange, which not only ensures no gas leakage, but also facilitates replacement during maintenance.

The three-layer spray pipes are respectively equipped with manual valves. The opening of the inlet valves can be adjusted according to the process requirements, that is, the total spray water volume can be adjusted, and the nozzles of a certain layer can also be closed separately. The adjustment is convenient and reliable.

A U-shaped water seal pipe is installed on the water supply side of the spray tower to ensure that the gas in the spray tower does not escape even if the water supply is cut off.

The spray tower is equipped with two packing layers, which are used to remove the mechanical water brought in by the gas cleaning process, so as to ensure that the water content of the gas sent to the gas pipeline network meets the process requirements.

The spray tower body is designed as a self-supporting structure, which can be stably installed on the foundation without external steel structure support.

The maintenance manhole is set at the appropriate position of the spray tower, which is convenient for internal inspection and filler replacement.

The utility model has the advantages of:

The water used in the gas spray cooling tower is the sewage circulating water provided by the original gas wet dedusting system. For blast furnace gas cleaning with dry and wet method and gas cleaning system, when it is in the dry dedusting state, the original gas cleaning sewage circulating water pump The water volume can be appropriately adjusted down to ensure that the water level of the original Shuangwen washing tower is at a safe water level. The excess water can be used for gas spray washing, and the washed water returns to the pool, and then the water is sent back to the water treatment plant by the return pump. Dosing to adjust the PH value and other indicators, the water in the spray tower can be recycled, and there is basically no need to add new water.

Not only is it well adapted to the requirements of different working conditions for the gas cleaning system, but it also solves the corrosion problem of the pipeline due to the high content of acid ions and chloride ions in the clean gas by dry dust removal. The PH value of the gas condensate was increased from 1.5 before washing to 5.8 after washing, and the chloride ion content was reduced from 1400ppm to 156ppm, achieving good comprehensive benefits.

Description of drawings

Fig. 1 is the schematic diagram of an embodiment of the utility model;

Fig. 2 is the schematic diagram of the utility model embodiment spray tower;

Fig. 3 is a cross-sectional view of an embodiment of the present invention.

Detailed ways

Referring to Fig. 1～Fig. 3, the spray tower of the utility model gas dry dedusting, it comprises, tower body 1, its one side is provided with the gas inlet 101 that connects gas pipeline 9, and the gas outlet 102 is provided at the tower body top; There are two layers of packing layers 2, 2' in the upper part, and a drainage bucket 3 in the lower part of the tower body 1; three layers of water spraying structure, each layer of water spraying structure includes an annular water pipe 4, and several spray guns 5, 5' arranged on the annular water pipe 4 The 4 rings of the annular water pipes are arranged on the outside of the tower body 1, and the water spray ends of the spray guns 5 and 5' pass through the tower body 1 corresponding to the tower body; Drainage sealing tank 11 is arranged on the drain side of the tower body 1, and is connected to the drain bucket 3 in the lower part of the tower body 1 through the drain pipe 10.

The inner diameter of the tower body 1 is 3 times of the inner diameter of the gas pipeline 9 . The spray gun is connected with the spray tower body through the flange. Control valves are respectively set on the three-layer annular water pipes 4 . A U-shaped water seal pipe 7 is arranged on the water supply pipeline 6 . The tower body 1 is designed with a self-supporting structure 8 that can be stably installed on the foundation.

The pool 12 of the spray tower is provided with an electronic water level gauge, and three water pumps 13 are arranged on the side of the pool, which can control the start and stop of the water pump according to the setting of the water level, so that the whole system is in an automatic operation state.

In addition, the tower body 1 described in the utility model is also provided with a maintenance manhole for inspection of the interior and replacement of fillers.

Claims (8)

1. The spray tower for gas dry dedusting is characterized in that it comprises, The tower body has a gas inlet connected to the gas pipeline on one side, and a gas outlet on the top of the tower body; at least two layers of packing layers are arranged on the upper part of the tower body, and a drainage bucket is arranged on the lower part of the tower body; At least three layers of water spray structure, each layer of water spray structure includes an annular water pipe, a number of spray guns arranged on the annular water pipe; the annular water pipe ring is set outside the tower body, and the water spray end of the spray gun passes through the corresponding tower body of the tower body; each annular water pipe is respectively Connect the water supply pipeline; flow meters and control valves are installed on the water supply pipeline; The drainage sealing tank is arranged on the drainage side of the tower body, and is connected to the drainage bucket at the lower part of the tower body through a pipe. 2. The spray tower for gas dry dedusting as claimed in claim 1, wherein the inner diameter of the tower body is 3 times of the inner diameter of the gas pipeline. 3. The spray tower for gas dry dedusting according to claim 1, wherein the spray gun is connected to the spray tower body through a flange. 4. The spray tower for gas dry dedusting as claimed in claim 1, characterized in that control valves are respectively set on the said annular water pipes. 5. The spray tower for gas dry dedusting as claimed in claim 1, characterized in that a U-shaped water seal pipe is arranged on the water supply pipeline. 6. The spray tower for gas dry dust removal according to claim 1, characterized in that, the tower body is designed with a self-supporting structure that can be stably installed on the foundation. 7. The spray tower for gas dry dedusting as claimed in claim 1, characterized in that, the tower body is also provided with maintenance manholes for inspection of the interior and replacement of fillers. 8. The spray tower for gas dry dedusting as claimed in claim 1, wherein the water supply pipeline is connected to a pool, and the pool is provided with an electronic water level gauge and a water pump.

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