Method and device for regenerating a spent dechlorination agent of blast furnace gas

Abstract

The application discloses a kind of blast furnace gas waste dechlorination agent regeneration treatment method and device, the method includes step one dust removal, step two purging, step three assay, step four, if component reaches standard after waste dechlorination agent if qualified, then can direct recycling use;If component does not reach standard, then return to step one continue above-mentioned each step processing, until component reaches standard;The device includes dechlorination tower waste dechlorination agent outlet is sequentially connected with waste dechlorination agent storage bin, waste dechlorination agent transmission device, vibration dust removal device, steam purging regeneration device, the transmission device of dechlorination agent after regeneration returns dechlorination tower and the good dechlorination agent storage bin arranged in dechlorination tower top.This application realizes the regeneration and recycling of waste dechlorination agent, does not use lye, does not produce a large amount of waste water, energy saving and cost reduction, and the operation cost is low.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of blast furnace gas treatment, and particularly relates to a method and device for regenerating waste dechlorination agent of blast furnace gas. BACKGROUND

[0002] In the process of the current blast furnace gas desulfurization technology, if the chlorine ions contained in the blast furnace gas are not treated, they will have a great impact on the subsequent equipment and desulfurization. Therefore, after the dust removal, the blast furnace gas first enters the dechlorination tower for dechlorination. The flow rate of the blast furnace gas entering the dechlorination tower is reduced. With the passage of time, the furnace dust slowly deposits in the dechlorination tower due to the obstruction of the packing dechlorination agent, wraps the dechlorination agent, and blocks the pores of the dechlorination agent, etc., so as to reduce the efficiency of the dechlorination agent or lose the dechlorination effect. The patent with publication number CN114606022A discloses a method for regenerating waste dechlorination agent, which comprises the following steps: step one, sampling and detecting the chlorine content of the waste dechlorination agent and then grading; step two, drying; step three, spraying alkali solution; and step four, baking. The patent with publication number CN109453754A discloses a method for regenerating waste dechlorination agent, which adopts the method of washing the waste dechlorination agent with water to wash the chlorine in the waste dechlorination agent, and then introduces alkali metal compounds by spraying a water solution containing the alkali metal compounds, so as to improve the chlorine content of the regenerated dechlorination agent and obtain the regenerated dechlorination agent. The existing waste dechlorination agent regeneration method has a complex technical process, generates a large amount of wastewater, consumes a large amount of alkali solution and energy, and has a high operation cost. SUMMARY

[0003] The purpose of the present application is to provide a method and device for regenerating waste dechlorination agent of blast furnace gas, which solves the problems of the existing waste dechlorination agent regeneration method, such as complex technical process, generation of a large amount of wastewater, consumption of a large amount of alkali solution and energy, and high operation cost.

[0004] The purpose of the present application is achieved in the following way: a method for regenerating waste dechlorination agent of blast furnace gas, characterized in that the method comprises the following steps:

[0005] Step one, dust removal: the waste dechlorination agent discharged from the dechlorination tower enters the vibration dust removal device for dust removal, removes the dust on the surface of the waste dechlorination agent, and monitors the dust removal completion degree in real time. The dust falling from the vibration falls on the metering scale, and the weight of the dust on the metering scale is monitored in real time. When the weight of the metering scale no longer increases, the dust removal operation is completed.

[0006] Step two, purging: the waste dechlorination agent after the dust removal is confirmed to be transported to the regeneration device and placed on the fixed bed. The saturated steam under a certain pressure is blown downward from above for a certain time to remove the impurities adsorbed in the pores of the dechlorination agent.

[0007] Step three, assay: the waste dechlorination agent after the saturated steam blowing for a certain time is subjected to component assay to detect the Cl -, CaO and other metal oxide effective component content;

[0008] Step four, if the composition of the waste dechlorination agent is up to standard, it can be directly recycled; if the composition is not up to standard, it returns to step one and continues to be processed according to the above steps until the composition is up to standard.

[0009] Further, the vibration frequency of the vibration ash removal in step one is 3000 revolutions per minute.

[0010] Further, the saturated steam blowing in step two is saturated steam blowing at 100℃, 0.3MPa-0.5MPa pressure, the blowing time is 50-70 minutes, the saturated steam is blown out from the steam nozzle at the upper part of the fixed bed, passes through the waste dechlorination agent and is discharged from the lower part of the fixed bed, ensuring that the waste dechlorination agent and the saturated steam are in full contact, and realizing the removal of impurity components.

[0011] Further, the step three test of Cl - , CaO and other metal oxide effective component content, when the test of the waste dechlorination agent Cl - content is less than 50% and the CaO and other metal oxide effective component content is greater than 50%, it is considered to be qualified.

[0012] A device comprising a blast furnace gas waste dechlorination agent regeneration treatment method, comprising a dechlorination tower, a detection device, a conveying device, the device further comprises: the waste dechlorination agent storage bin is sequentially connected after the waste dechlorination agent outlet of the dechlorination tower, the waste dechlorination agent transmission device, the vibration ash removal device, the steam blowing regeneration device, the transmission device of the regenerated dechlorination agent returning to the dechlorination tower, and the good dechlorination agent storage bin connected with the top of the dechlorination tower.

[0013] Further, the vibration ash removal device comprises a vibrating screen and a metering scale, the metering scale is arranged below the vibrating screen mesh, and the vibrating screen mesh has a mesh number of 200 meshes.

[0014] Further, the regeneration device is provided with a fixed bed, the upper end of the device is provided with a waste dechlorination agent inlet and a steam inlet; the lower end is provided with a steam outlet, a regenerated dechlorination agent outlet and a regenerated dechlorination agent detection port, and the saturated steam is injected from the upper part of the fixed bed.

[0015] Further, the vibration ash removal device further comprises one or more of a vibration device, a screening device, a centrifugal separation device and a gas blowing device, which are used in combination to remove ash to the extent that there is no visible dust on the surface of the waste dechlorination agent.

[0016] Further, the waste dechlorination agent transmission device adopts an inclined chute or a pipeline, and the waste dechlorination agent is conveyed to the vibrating screen by gravity through the inclined chute or the pipeline.

[0017] Further, the transmission device for returning the regenerated dechlorination agent to the dechlorination tower adopts a bucket elevator, and the regenerated dechlorination agent is transported to a good dechlorination agent storage bin through the bucket elevator, and the unqualified dechlorination agent is transported to a waste dechlorination agent storage bin.

[0018] The method and device of the present application have the following advantages: through the method and device of the present application, the dust is removed by vibration, the weight of the removed dust is monitored in real time by using a metering scale, and the completeness of dust removal is ensured; the waste dechlorination agent is saturated steam purged by using a fixed bed process, the waste dechlorination agent and the saturated steam are fully contacted, and the impurities are removed to the maximum extent; the treated waste dechlorination agent is analyzed for the effective component content of metal oxides such as Cl - , CaO, etc., and the regeneration and recycling of the waste dechlorination agent are realized. The method does not use lye and liquid water, so a large amount of wastewater is not generated, and processes such as agent heating and calcination are not required, so the operation is simple, energy consumption is reduced, and the operation cost is low.

[0019] The present application will be further explained in combination with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The process flow block diagram of the waste dechlorination agent regeneration treatment of the present application;

[0021] Figure 2 The device connection schematic diagram of the present application.

[0022] Embodiment one:

[0023] This embodiment is a waste dechlorination agent regeneration treatment method for blast furnace gas, as shown in Figure 1 , Figure 2 , the method is as follows:

[0024] Step one, dust removal: the waste dechlorination agent discharged from the dechlorination tower 1 enters the vibration dust removal device for dust removal, the dust attached to the surface of the waste dechlorination agent is removed by vibration at a vibration frequency and time set by the vibration screen 4, the dust removed by vibration falls on the metering scale 4, and the weight of the dust on the metering scale is monitored in real time; when the weight of the metering scale no longer increases, the dust removal operation is completed.

[0025] Step two, purging: the waste dechlorination agent after confirming the completion of the dust removal is transported to the regeneration device and placed on the fixed bed 7, and the saturated steam under a certain pressure is blown downward from above for a certain time to remove the impurities adsorbed in the pores of the dechlorination agent; the waste dechlorination agent needs to be turned over during the purging process to make the purging effect better.

[0026] Step three, analysis: the waste dechlorination agent after being purged by the saturated steam for a certain time is analyzed for the effective component content of metal oxides such as Cl - , CaO, etc.

[0027] Step four, if the composition of the spent dechlorination agent is up to standard, it can be returned to the dechlorination tower for recycling; if the composition is not up to standard, it is returned to step one for further processing until the composition is up to standard.

[0028] Example two:

[0029] This embodiment is an improvement of example one and a refinement of step one of example one. The vibration frequency of the vibration ash removal in step one of this embodiment is 3000 revolutions per minute.

[0030] Example three:

[0031] Based on the above-mentioned embodiments, this embodiment is an improvement of example one and a refinement of step two of example one. The saturated steam blowing in step two of this embodiment is saturated steam blowing at a temperature of 100°C and a pressure of 0.3-0.5 MPa. The blowing time is 50-70 minutes. The saturated steam is blown out from the steam nozzles at the upper part of the fixed bed, passes through the spent dechlorination agent, and is discharged from the lower part of the fixed bed, ensuring that the spent dechlorination agent and the saturated steam are in full contact and the impurity components are removed.

[0032] Example four:

[0033] Based on the above-mentioned embodiments, this embodiment is an improvement of example one and a refinement of step three of example one. The effective component content of Cl - , CaO, and other metal oxides in the spent dechlorination agent is tested in step three of this embodiment. If the Cl - content of the spent dechlorination agent is less than 50% and the effective component content of CaO and other metal oxides is greater than 50%, the test is considered to be qualified.

[0034] Example five:

[0035] A device comprising the blast furnace gas spent dechlorination agent regeneration treatment method of example one, as shown in FIG. 1, includes a dechlorination tower 1 and a detection device 16. The device further includes a spent dechlorination agent storage bin 3, a spent dechlorination agent transmission device 6, a vibration ash removal device, a steam blowing regeneration device, a transmission device 15 for returning the regenerated dechlorination agent to the dechlorination tower, and a good dechlorination agent storage bin 14 connected to the top of the dechlorination tower 1, which are sequentially connected in the order mentioned. Figure 2

[0036] Example six:

[0037] Based on the above-mentioned embodiments, this embodiment is an improvement of example five and a refinement of the vibration ash removal device of example five. As shown in FIG. 2, the vibration ash removal device of this embodiment includes a vibration motor 7, a vibration plate 8, a vibration spring 9, and a vibration spring support 10. Figure 2 ​As shown, the vibration ash cleaning device includes a vibrating screen 4, a metering scale 5, which is arranged below the vibrating screen 4 screen mesh, the vibrating screen 4 screen mesh 200 mesh, the dust falling on the metering scale 5, real-time monitoring of the weight of the dust on the metering scale, when the weight of the metering scale 5 is no longer increased, that is, the ash cleaning operation is completed, the metering scale precision to the two decimal places.

[0038] Example seven:

[0039] On the basis of the above examples, this embodiment is the improvement of example five, which is the refinement of example five about the regeneration device. As shown, Figure 2 The regeneration device is provided with a fixed bed 7, the upper end of the device is provided with a waste dechlorination agent inlet 8, a steam inlet 10; the lower end is provided with a regenerated dechlorination agent outlet 9, a steam outlet 11, a regenerated dechlorination agent detection port 12, and saturated steam is sprayed from above the fixed bed.

[0040] Example eight:

[0041] On the basis of the above examples, this embodiment is the improvement of example five, and the vibration ash cleaning device of this embodiment also includes one or several of the devices of oscillation, screening, centrifugal separation, gas blowing, etc., which cooperate with ash cleaning to achieve the degree of no visible dust on the surface of the waste dechlorination agent.

[0042] Example nine:

[0043] On the basis of the above examples, this embodiment is the improvement of example five, and this embodiment is the refinement of the waste dechlorination agent conveying device. As shown, Figure 2 The waste dechlorination agent conveying device adopts an inclined chute or a pipeline 6, and the waste dechlorination agent is conveyed to the vibrating screen 4 through the inclined chute or the pipeline 6 by its own gravity.

[0044] Example ten:

[0045] On the basis of the above examples, this embodiment is the improvement of example five, and the conveying device 15 of the regenerated dechlorination agent returning to the dechlorination tower adopts a bucket elevator, which conveys the qualified regenerated dechlorination agent to the good dechlorination agent storage bin 14 for reuse; the unqualified one is conveyed to the waste dechlorination agent storage bin 3, and is treated again according to the steps and methods of example one.

Claims

1. A method for regenerating a waste dechlorinating agent from blast furnace gas, characterized in that: The following device is used: including a dechlorination tower, a detection device, and a conveying device, characterized in that the device also includes: a waste dechlorination agent storage bin, a waste dechlorination agent transmission device, a vibration cleaning device, a steam purge regeneration device, a transmission device for returning the regenerated dechlorination agent to the dechlorination tower, and a good dechlorination agent storage bin connected to the top of the dechlorination tower. The regeneration device is provided with a fixed bed, and the upper end of the device is provided with a waste dechlorination agent inlet and a steam inlet; the lower end is provided with a steam outlet, a regenerated dechlorination agent outlet, and a regenerated dechlorination agent detection port. Saturated steam is sprayed from above the fixed bed. The method is as follows: Step 1: Cleaning: The spent dechlorinating agent discharged from the dechlorination tower enters the vibrating cleaning device for cleaning. The vibration frequency is 3000 rpm to remove the ash on the surface of the spent dechlorinating agent. The completion of the cleaning is monitored at all times. The dust vibrated off falls on the weighing scale, and the weight of the dust on the weighing scale is monitored in real time. When the weight on the weighing scale no longer increases, the cleaning operation is completed. Step 2: Blowing: After confirming that the spent dechlorination agent has been cleaned, it is transported to the regeneration device and placed on a fixed bed. Saturated steam at 100°C and 0.3-0.5 MPa pressure is blown out from the steam nozzle on the upper part of the fixed bed, blowing the spent dechlorination agent downward from the top for 50-70 minutes. After passing through the spent dechlorination agent, it is discharged from the lower part of the fixed bed to ensure that the spent dechlorination agent is fully in contact with the saturated steam and remove impurities adsorbed in the pores of the dechlorination agent. The spent dechlorination agent is constantly turned over during the blowing process. Step 3: Chemical analysis: After saturated steam is purged for a certain period of time, the spent dechlorination agent is subjected to a chemical analysis to detect Cl - , the effective content of CaO metal oxides, when the waste dechlorination agent Cl - If the content is less than 50% and the mass fraction of the effective component of CaO metal oxide is greater than 50%, the test is considered qualified; Step 4: If the waste dechlorination agent meets the standards after testing, it can be directly recycled; if the standards are not met, it returns to step 1 and continues the above steps until the standards are met.

2. The method for regenerating a waste dechlorinating agent from blast furnace gas according to claim 1, wherein: The vibration dust cleaning device includes a vibrating screen and a weighing scale. The weighing scale is arranged below the vibrating screen mesh. The mesh size of the vibrating screen is 200 meshes.

3. The method for regenerating a waste dechlorinating agent from blast furnace gas according to claim 1, wherein: The vibration cleaning device also includes one or more of vibration, screening, centrifugal separation, and gas purging devices for cleaning, so as to achieve a level where there is no visible dust on the surface of the waste dechlorination agent.

4. The method for regenerating a waste dechlorinating agent from blast furnace gas according to claim 1, wherein: The waste dechlorination agent transmission device adopts an inclined chute or a pipeline, and the waste dechlorination agent is transported to the vibrating screen through the inclined chute or the pipeline by its own gravity.

5. The method for regenerating a waste dechlorinating agent from blast furnace gas according to claim 1, wherein: The transmission device for returning the regenerated dechlorinating agent to the dechlorination tower adopts a bucket elevator, through which the qualified regenerated dechlorinating agent is transported to the good dechlorinating agent storage bin, and the unqualified one is transported to the waste dechlorinating agent storage bin.

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