Blast furnace gas dechlorination tower

Abstract

The utility model belongs to the technical field of clean utilization of energy sources, and particularly relates to a blast furnace gas dechlorination tower which comprises a dechlorination tower body, a circulating liquid storage tank and a blast furnace gas inlet are arranged at the bottom of the dechlorination tower body, and a blast furnace gas outlet is arranged at the top of the dechlorination tower body; a tray, a spraying layer and a condensation type demister are sequentially arranged in the dechlorination tower body from bottom to top, the blast furnace gas outlet is positioned above the condensation type demister, and the blast furnace gas inlet is positioned between the circulating liquid storage tank and the tray. According to the utility model, by utilizing the characteristic that chlorine salt and HCl gas are extremely easy to dissolve in water, the blast furnace gas is washed by clean water through the spraying layer, so that most chlorine salt and HCl gas in the blast furnace gas can be effectively removed, and then the blast furnace gas is cooled by adopting the condensation type demister, so that residual chlorine salt and small-particle dust can be effectively removed; not only can high-efficiency and low-cost dechlorination of the blast furnace gas be realized, but also a good protection effect on a downstream process system is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of clean energy utilization, and in particular relates to a blast furnace gas dechlorination tower. Background Art

[0002] At present, the blast furnace gas fine desulfurization technology basically adopts the process route of hydrolysis + adsorption. The short life of the hydrolyzing agent is a common problem in blast furnace gas fine desulfurization projects.

[0003] Blast furnace gas contains a large amount of toxic substances, such as chloride ions (Cl - ), dust, etc., directly affect the clean utilization of blast furnace gas. During the hydrolysis process, the chloride ions (Cl-) in the gas will increase the acid sites on the catalyst surface and reduce the activity of the hydrolysis catalyst. Therefore, in order to extend the life of the hydrolyzer, a dechlorination device needs to be installed before the catalytic hydrolysis reaction.

[0004] After the blast furnace gas passes through the residual pressure power generation (TRT), the temperature is reduced to 60-95℃. The temperature fluctuation will produce a large amount of condensed water, and toxic substances will form aerosols in the gas. The condensed large particles are easy to be discharged from the system, but the dust and salt with a particle size of less than 1um are difficult to remove. The chlorine capacity of conventional hydrolysis protective agents is low, only about 10%, and the use cost is high, which is easy to cause the escape of toxic substances and poison the hydrolysis agent. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model aims to provide a blast furnace gas dechlorination tower which can achieve low-cost dechlorination and dust removal and has a good protective effect on downstream process systems.

[0006] To achieve the above-mentioned purpose, the technical solution of the utility model is a blast furnace gas dechlorination tower, including a dechlorination tower body, a circulating liquid storage tank and a blast furnace gas inlet are arranged at the bottom of the dechlorination tower body, and a blast furnace gas outlet is arranged at the top of the dechlorination tower body; a tray, a spray layer and a condensing demister are arranged in sequence from bottom to top in the dechlorination tower body, the blast furnace gas outlet is located above the condensing demister, and the blast furnace gas inlet is located between the circulating liquid storage tank and the tray.

[0007] As one of the implementation modes, a ridge-type demister is further provided in the dechlorination tower body, and the ridge-type demister is located between the condensing demister and the blast furnace gas outlet.

[0008] As one of the implementation modes, the ridge-type demister has two layers.

[0009] As one of the implementation modes, the condensing demister is provided with a graphene heat exchange tube bundle.

[0010] As one of the implementation modes, the spray layer is connected to the circulating liquid storage tank through a circulating liquid pipeline.

[0011] As one of the implementation modes, a circulation pump and a plate heat exchanger are provided on the circulating liquid pipeline.

[0012] As one of the implementation modes, the spray layer has two layers, and the two spray layers are arranged in an upper and lower space.

[0013] As one of the implementation modes, the pallet includes a pallet body having a plurality of through holes, a cylinder is provided on the top surface of the pallet body at a position corresponding to each of the through holes, and a hood is fixed to the top of each of the cylinders via a bracket.

[0014] As one of the implementation modes, the tray is made of 2205 stainless steel.

[0015] As one of the implementation modes, the dechlorination tower body is made of fiberglass reinforced plastics.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] (1) The utility model utilizes the characteristics that chloride salts and HCl gas are very soluble in water. First, the blast furnace gas is washed with clean water through a spray layer, which can effectively remove most of the chloride salts and HCl gas in the blast furnace gas. Then, a condensing demister is used to cool the blast furnace gas, which can effectively remove residual chloride salts and small particles of dust. It can not only achieve efficient and low-cost dechlorination of blast furnace gas, but also has a good protective effect on downstream process systems.

[0018] (2) The utility model adopts a condensing demister to reduce the temperature of blast furnace gas, and while removing chloride salts and small dust particles, a large amount of condensate is generated to wash the surface of the tube bundle without scaling;

[0019] (3) The utility model sets a plate heat exchanger on the circulating liquid pipeline to effectively control the circulating liquid temperature, maintain the dynamic balance between the evaporating liquid and the condensing liquid, keep the water balance of the dechlorination tower, and reduce the amount of wastewater discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a blast furnace gas dechlorination tower provided in an embodiment of the utility model;

[0022] In the figure: 1. Dechlorination tower body; 2. Tray; 3. Spray layer; 4. Condensing demister; 5. Ridge demister; 6. Circulating liquid pipeline; 7. Circulating pump; 8. Plate heat exchanger; 9. Circulating liquid storage tank; 10. Blast furnace gas inlet; 11. Blast furnace gas outlet. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] like Figure 1 As shown, this embodiment provides a blast furnace gas dechlorination tower, including a dechlorination tower body 1, the bottom of the dechlorination tower body 1 is provided with a circulating liquid storage tank 9 and a blast furnace gas inlet 10, and the top of the dechlorination tower body 1 is provided with a blast furnace gas outlet 11; the dechlorination tower body 1 is provided with a tray 2, a spray layer 3 and a condensing demister 4 from bottom to top, the blast furnace gas outlet 11 is located above the condensing demister 4, and the blast furnace gas inlet 10 is located between the circulating liquid storage tank 9 and the tray 2. This embodiment utilizes the characteristics that chloride salts and HCl gas are very soluble in water, firstly washes the blast furnace gas with clean water through the spray layer 3, which can effectively remove most of the chloride salts and HCl gas in the blast furnace gas, and then uses the condensing demister 4 to cool the blast furnace gas, which can effectively remove residual chloride salts and small particles of dust, which can not only achieve high-efficiency and low-cost dechlorination of blast furnace gas, but also have a good protective effect on the downstream process system.

[0026] To optimize the above embodiment, a ridge-type demister 5 is further provided in the dechlorination tower body 1, and the ridge-type demister 5 is located between the condensing demister 4 and the blast furnace gas outlet 11. The ridge-type demister 5 can further remove residual droplets and reduce the chlorine content in the blast furnace gas.

[0027] In one embodiment, the ridge-type demister 5 has one layer; in another embodiment, the ridge-type demister 5 has two layers.

[0028] Furthermore, the condensing demister 4 is provided with a graphene heat exchange tube bundle, and the graphene heat exchange tube bundle is provided with a circulating cooling water inlet and a circulating cooling water outlet. Among them, the graphene heat exchange tube bundle has a high thermal conductivity, can quickly transfer heat, improve heat exchange efficiency, and has good corrosion resistance, extending its service life in the dechlorination tower body 1. The graphene heat exchange tube bundle reduces the blast furnace gas temperature by about 2°C, can effectively remove chloride salts and small particles of dust, and at the same time generates a large amount of condensate to wash the surface of the tube bundle without scaling.

[0029] Furthermore, the spray layer 3 is connected to the circulating liquid storage tank 9 via a circulating liquid pipeline 6. The spray liquid sprayed by the spray layer 3 falls into the circulating liquid storage tank 9 for storage, and can enter the spray layer 3 again through the circulating liquid pipeline 6 as spray liquid.

[0030] The above embodiment is optimized, and a circulating pump 7 and a plate heat exchanger 8 are provided on the circulating liquid pipeline 6. The circulating pump 7 is provided on a side close to the circulating liquid storage tank 9, and the plate heat exchanger 8 is provided between the circulating pump 7 and the spray layer 3. The circulating liquid in the circulating liquid storage tank 9 is pressurized by the circulating pump 7 and sent to the plate heat exchanger 8. The plate heat exchanger 8 reduces the temperature of the circulating liquid by about 4°C, and the circulating liquid after cooling is sent to the spray layer 3 as spray liquid through the pipeline. The plate heat exchanger 8 can effectively control the temperature of the circulating liquid, maintain the dynamic balance between the evaporating liquid and the condensing liquid, maintain the water balance of the dechlorination tower, and reduce the amount of wastewater discharge.

[0031] In one implementation, the spray layer 3 has two layers, and the two layers of the spray layers 3 are arranged at intervals. Specifically, the two layers of spray layers 3 are arranged at different heights in the dechlorination tower body 1, and the interval is maintained at 2.5 meters, and each layer of the spray layer 3 is connected to the circulating liquid storage tank 9 through the circulating liquid pipeline 6. After the spray liquid of the two layers of spray layers 3 is sequentially heat-transferred with the blast furnace gas, the temperature of the blast furnace gas can be maintained at an equilibrium temperature of 40 to 46°C.

[0032] like Figure 1 As shown, the tray 2 includes a tray 2 body, the tray 2 body is provided with a plurality of through holes, a cylinder is provided on the top surface of the tray 2 body at positions corresponding to the through holes, the bottom of each cylinder is connected to the corresponding through hole, and a hood is fixed to the top of each cylinder through a bracket. In one embodiment, the hood is tilted to facilitate the falling of the spray liquid falling on it.

[0033] In this embodiment, the tray 2 is made of 2205 stainless steel, which has good corrosion resistance, thereby extending the service life of the tray 2. In addition, 2205 stainless steel has high strength and is not easily deformed or damaged.

[0034] In this embodiment, the dechlorination tower body 1 is made of glass fiber reinforced plastic, which has good corrosion resistance and is light and high-strength.

[0035] The working process of the blast furnace gas dechlorination tower of the present embodiment is as follows:

[0036] The impurity-containing 60-90°C blast furnace gas enters the dechlorination tower body 1 from the blast furnace gas inlet 10 at the bottom of the dechlorination tower body 1, enters the cylinder through the through hole on the tray 2, and then enters the bottom of the spray layer 3 through the hood opening between the cylinder and the hood; the blast furnace gas and the spray liquid sprayed by the two layers of spray layers 3 are fully heat-transferred and the temperature is reduced to a saturated state of 40-46°C, and most of the chloride ions and large dust particles in the blast furnace gas are removed;

[0037] Next, the blast furnace gas enters the condensing demister 4 and exchanges heat with the graphene condenser tube in the demister. The temperature of the blast furnace gas is reduced by 2°C. Aerosols formed by tiny dust, chlorine-containing salts, etc. serve as condensation nuclei to form larger droplets that are captured by the rotating condenser tube.

[0038] Subsequently, the blast furnace gas passes through two layers of roof-type demisters 5, and the residual mist droplets are removed under the action of the internal baffles; the clean blast furnace gas is discharged from the blast furnace gas outlet 11 at the top of the dechlorination tower body 1 and enters the subsequent fine desulfurization section.

[0039] This embodiment uses the characteristics that chloride salts and HCl gas are very soluble in water, and combines clean water washing and condensation demisting for the first time to remove toxic substances in blast furnace gas, which has the characteristics of high efficiency and low cost, and the chlorine content of blast furnace gas after purification by the blast furnace gas dechlorination tower is less than 1mg / Nm 3 , which can effectively protect the downstream process system. At the same time, the spray liquid after heat exchange with blast furnace gas falls into the tray 2. When the spray liquid accumulates beyond the wind cap opening, it will overflow through the wind cap opening to the circulating liquid storage tank 9 at the bottom of the dechlorination tower body 1 and be reused as spray liquid.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A blast furnace gas dechlorination tower, comprising a dechlorination tower body, characterized in that: A circulating liquid storage tank and a blast furnace gas inlet are arranged at the bottom of the dechlorination tower body, and a blast furnace gas outlet is arranged at the top of the dechlorination tower body; a tray, a spray layer and a condensing demister are arranged in sequence from bottom to top in the dechlorination tower body, the blast furnace gas outlet is located above the condensing demister, and the blast furnace gas inlet is located between the circulating liquid storage tank and the tray.

2. The blast furnace gas dechlorination tower according to claim 1, characterized in that: The dechlorination tower body is also provided with a ridge-type demister, and the ridge-type demister is located between the condensing demister and the blast furnace gas outlet.

3. The blast furnace gas dechlorination tower as claimed in claim 2, characterized in that: The roof type demister has two layers.

4. The blast furnace gas dechlorination tower according to claim 1, characterized in that: The condensing demister is provided with a graphene heat exchange tube bundle.

5. The blast furnace gas dechlorination tower according to claim 1, characterized in that: The spray layer is connected to the circulating liquid storage tank through a circulating liquid pipeline.

6. The blast furnace gas dechlorination tower as claimed in claim 5, characterized in that: The circulating liquid pipeline is provided with a circulating pump and a plate heat exchanger.

7. The blast furnace gas dechlorination tower according to claim 6, characterized in that: The spray layers include two layers, and the two spray layers are arranged at intervals up and down.

8. The blast furnace gas dechlorination tower according to claim 1, characterized in that: The tray comprises a tray body, a plurality of through holes are arranged on the tray body, a cylinder is arranged on the top surface of the tray body at a position corresponding to each of the through holes, and a hood is fixed on the top of each of the cylinders via a bracket.

9. The blast furnace gas dechlorination tower according to claim 1, characterized in that: The tray is made of 2205 stainless steel.

10. The blast furnace gas dechlorination tower according to claim 1, characterized in that: The dechlorination tower body is made of glass fiber reinforced plastic.

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