Industrial blast furnace gas hydrogen chloride gas recovery method and device

The invention application to name is "a high-efficient hydrogen sulfide gas absorption device", application date is 30 June 2016, application number is 201610494578.6 of the invention, as in the present invention swirl injection adsorber structure of priority.

Technical Field

The present invention relates to the technical field of blast furnace gas purification, suitable for blast furnace gas hydrogen chloride gas recovery process. In particular, the invention provides industrial blast furnace gas hydrogen chloride gas recovery method and apparatus.

Background Art

Hydrogen chloride is a colorless and pungent smell gas, melting point -114.2 degrees, boiling point -85 degrees, not in the air combustion, thermal stability, to about 1500 °C decomposition. A stifling smell, with strong stimulation to the upper respiratory tract, eye, skin, mucous membrane of corrosion. The density is greater than air, its aqueous solution is hydrochloric acid, concentrated hydrochloric acid with volatile.

Blast furnace gas is generated in the iron-making process by-product, the main component is: CO, CO₂ , N₂ , H₂ , CH₄ And the like, wherein the content of the combustible component CO accounts for about 25% of the left and right, H₂ , CH₄ The content of the less, CO₂ , N₂ The respective content of 15%, 55%.

In the blast furnace smelting process by the iron ore, coke and coal dust into a series of chemical reactions of a chlorine process after HCl gas to enter the gas in a blast furnace, under the conditions in the dry dust removal of the causes the blast pressure turbine generating device (abbreviated as TRT) blade and gas pipeline corrosion serious, when the blast furnace gas after the combustion is still to HCl in gaseous form into the atmosphere, causing pollution to the environment.

The present domestic adopts a plurality of method and apparatus for removing hydrogen chloride in the blast furnace gas, Patent 201010264346.4 adopts a tower apparatus liquid absorption treatment hydrogen chloride, Patent 201020611850.2 discloses tower equipment spurting alkali absorption treatment blast furnace gas in hydrogen chloride, Patent 201410210169. X by using the special dechlorination mechanism removing hydrogen chloride gas. The present common blast furnace gas and hydrogen chloride gas recovery method is complex, occupies large area, high investment, incidental equipment more. Unsighted adopts the multi-stage vortex injection and the adsorber for blast furnace gas hydrogen chloride gas recovery processing of the research report.

Content of the invention

In order to overcome the shortcomings of the existing method, the present invention provides a kind of industrial coke oven gas hydrogen chloride recovery method and apparatus

Industrial blast furnace gas hydrogen chloride gas recovery method, characterized in that

(1) industrial blast furnace gas enter the primary heat exchanger for cooling;

(2) cooling the gas after entering the single-stage or multi-stage vortex injection adsorber, while at the same time absorbing agent also enters the single-stage or multi-stage bridge swirl injection adsorber;

(3) from the single-stage or multi-stage blast furnace gas swirl injection adsorption device top the entrance cuts to enter, from the single-stage or multi-stage absorber swirl injection adsorption device side wall into the small hole;

(4) in the radial direction of the streamline absorbent sprayed into the cut to the high-speed rotation of the blast furnace gas continuous cutting, forming numerous adsorption liquid droplet;

(5) after the absorbed by rich in hydrogen chloride from the single-stage or multi-stage liquid is swirl injection adsorption device flows out of the bottom, through the second heat exchanger enters into the liquid storage tank for recovering and storing;

(6) after purification from the single-stage or multi-stage blast furnace gas swirl injection adsorption device top outflow, after the dehydration by the dryer entering the follow-up device.

Preferably, the step (1) of the first stage heat exchanger cooling liquid phase can be dissolved hydrogen chloride vapor, hydrogen chloride 1st stage removing efficiency reaches 5% or more.

Preferably, the step (2) of the multi-stage vortex injection adsorber is 2 - 5 level, hydrogen chloride 2nd stage removing efficiency up to 99% or more.

Preferably, the step (2) of the single-stage swirl injection adsorber operation is pressed and lowered to 1 - 5kpa.

Preferably, the step (2) of the single-stage or multi-stage vortex injection adsorption device side wall the apertures may be circular, semi-circular, triangular, square, hole area is 0.2 - 20 mm² .

Preferably, step (3) wherein the absorbent is water or alkaline solution, with water as the absorbing agent can be recovering hydrochloric acid, in order to ammonia as absorbing agent can be recovering ammonium chloride.

On the other hand, the present invention provides a kind of industrial blast furnace gas hydrogen chloride gas recovery device. The device includes:

First level heat exchanger, for cooling industrial blast furnace gas, pre-removing hydrogen chloride gas;

Single-stage or multi-stage vortex injection adsorber, used for absorbing the blast furnace gas in hydrogen chloride;

With the single-stage or multi-stage vortex injection adsorption device connected with the second heat exchanger, for cooling the liquid flow into among them;

With the single-stage or multi-stage vortex injection adsorption device connected with the dryer, for removing the purified blast furnace gas in liquid phase;

With the secondary heat exchanger is connected to the liquid storage tank, for the recovery of the storage liquid;

Preferably, the single-stage swirl injection adsorber in the dechlorination absorption efficiency of 99% or more.

Preferably, the single-stage or multi-stage vortex injection the absorber adopts different diameter, can handle different volume industrial blast furnace gas.

Preferably, the apparatus material needs to acid-alkali corrosion resistance.

Preferably, the multi-stage vortex injection adsorber can be integrated, the heat exchanger is a vertical or horizontal.

The method of this invention features are as follows:

(1) the swirl injection adsorber multi-stage series, effectively improve the dechlorination effect.

(2) vortex adsorption device side wall opening different, absorbent jet in different forms, mass transfer effects are different, can be affected to varying degrees dechlorination effect.

(3) absorbing agent is water or alkaline solution, with water as the absorbing agent can be recovering hydrochloric acid, in order to ammonia as absorbing agent can be recovering ammonium chloride.

(4) this method is suitable for industrial blast furnace gas working condition.

The device of this invention features are as follows:

Single-stage swirl injection adsorber in the dechlorination absorption efficiency of 99% or more.

The device is easy to integrate, swirl injection adsorbers, heat exchanger, liquid storage tank, drier of small diameter, of the reducing device occupying a total area and the total investment.

Description of drawings

Figure 1 is the single-stage swirl injection adsorber method flow chart of the present invention

Figure 2 is the multi-stage vortex injection adsorber method flow chart of the present invention

Figure 3 is the inner wall of the swirl injection adsorber injection schematic view of the invention

Symbol description:

1 industrial blast furnace; 2 absorbent storage tank; 3 absorbent liquid pump; 4 the secondary heat exchanger; 5 including chlorine liquid pump; 6 the liquid storage tank; 7 the secondary heat exchanger; 8 swirl injection adsorber; 9 dryer; 10 secondary swirl injection adsorber.

Mode of execution

As shown in Figure 2, industrial blast furnace 1 of the discharge of the blast furnace gas enter the primary heat exchanger 7 for cooling, at the same time the heat exchanger in the liquid phase to the gas phase hydrogen chloride to get rid of the 1st; exchanging the heat of the gas entering the stage or multi-stage swirl injection adsorber 8 and 10 in, at the same time storage tank 2 in the absorbent by the liquid pump 3 to pump swirl injection adsorber 8 and 10 in, 8 in the gas enters the multi-stage vortex injection adsorber 10 further purification; swirl injection adsorber 8 and 10 chlorine fluid enter the secondary heat exchanger 4, after the heat exchange by the liquid pump 5 is delivered to the storage tank chlorine fluid 6 in; by the swirl injection adsorber purification of the gas after entering the dryer 9 in drying, conveying to the follow-up device.

In the present invention swirl injection adsorber structure, can refer to the name of "a high-efficient hydrogen sulfide gas absorption device", application date is 21 September 2016, application number is 201610494578.6 of the invention.

The above statement is only under the concept of the present invention basic note, but according to the technological scheme of this invention by any equivalent conversion, should be belongs to the scope of protection of this invention.

The combination of the following embodiment the invention further note, the embodiment does not limit the scope of the invention.

Embodiment 1:

A Shanghai factory hydrogen chloride gas processing, in accordance with the invention method and apparatus for, by the single-stage cyclone adsorption gas in hydrogen chloride, inlet gas hydrogen chloride content of 0.5 ppm, the absorbent is not chloride ion, chloride ion-containing 120 mg/L water, chloride ion-containing 200 mg/L water.

The technical effects:

Using the model gas hydrogen chloride gas recovery method and apparatus, using different absorbent and the single stage cyclone injection adsorption device out of the hydrogen chloride concentration is reduced to 0.05 ppm following, efficiency is 90% or more, thereby greatly improving the hydrogen chloride recovery effect.

Embodiment 2:

The above condition gas with an absorbent, according to the present invention method and apparatus for, the multi-stage cyclone adsorption gas in hydrogen chloride.

The technical effects:

Using the model gas hydrogen chloride gas recovery method and apparatus, using different absorbent multi-stage swirl injection adsorption device out of the hydrogen chloride concentration is reduced to 0.01 ppm following, efficiency is 98% or more, thereby greatly improving the hydrogen chloride recovery effect.

The above description of the embodiment is only for help to understand the method of the present invention and a core idea. It should be noted that, for the technical field for the ordinary technical personnel, in not break away from the principle of the present invention under the premise, the present invention can also be several improvements and modification, these improvements and modification also falls into the the invention within the scope of protection.

To the disclosed embodiments of the above-mentioned note, of the field professional technicians can realize or use of the invention. These embodiments multi-modification of the field of the professional and technical personnel for is obvious, defined in this text the general principles can be without departing from the spirit of this invention or scope of the cases, in the other embodiment to realize. Therefore, the invention will not be limited to the herein shown in these embodiments, it is to comply with disclosed herein and features of a novel principle of consistent with the scope of the most wide.