Device for refining sulfur from coke oven gas desulfurization waste liquid

Abstract

The utility model discloses a device for refining sulfur from coke oven gas desulfurization waste liquid, which is characterized in that a concentration filter, a concentrated sulfur foam tank, a sulfur melting kettle, a steam-water separator, a slag discharge furnace, a gasification furnace, a primary cooler, a secondary cooler, a liquid sulfur tank and a granulator are sequentially connected through pipelines; the tail gas purification system is connected with the concentrated sulfur foam tank, the steam-water separator, the deslagging furnace, the secondary cooler, the liquid sulfur tank, the granulator and the scraper slag conveyor, and the scraper slag conveyor is connected with the sulfur melting kettle, the steam-water separator, the deslagging furnace and the gasification furnace. The device can be used for purifying and refining the crude sulfur in the desulfurization waste liquid to obtain a refined sulfur product, so that the traditional solid waste is changed into the refined sulfur product, and the waste is turned into wealth. The device has the characteristics of low energy consumption, continuous automatic production, high active safety performance, high product purity and good field operation environment.

Description

Technical Field

[0001] The utility model belongs to the sulfur refining technology in coking sulfur foam, in particular to a resource processing device for sulfur foam in coke oven gas desulfurization waste liquid. Background Art

[0002] At present, the coke oven gas desulfurization system generally adopts the HPF desulfurization process with short process, low cost and good desulfurization effect. This process converts hydrogen sulfide in coal gas into elemental sulfur through a catalyst, and exists in the upper layer of the desulfurization liquid in the form of sulfur foam. Plate and frame filter press is generally used to filter the sulfur foam in the desulfurization liquid to obtain a filter paste containing sulfur. Sulfur accounts for 45% to 65% of the sulfur paste. In addition, it also contains sulfates, thiocyanates, thiosulfates, tar, moisture, ammonium ions and other substances. Because it emits an unpleasant odor and has low utilization value, it is mainly treated as solid waste. The treatment method for this part of sulfur paste is to make sulfuric acid outside, but this method will cause a certain degree of environmental pollution or waste of resources. Regarding the resource utilization direction of sulfur paste, there are two main processes: sulfur paste acid production and sulfur paste purification to produce sulfur.

[0003] CN 105217578A discloses a process for preparing sulfur from coking sulfur paste, the main steps of which include heating the coking sulfur paste with heat-conducting oil, acid absorption, alkali absorption and photolysis of the waste gas in sequence, and then purifying and discharging it. CN 114031041A discloses a method for continuous sulfur melting of sulfur paste at normal pressure, in which the sulfur paste is continuously put into a sulfur melting tank and maintained at 140-150°C. In these patents, the purity of the molten sulfur product is difficult to meet the qualified requirements, and it is difficult to achieve continuous automated production of molten sulfur. Utility Model Content

[0004] The utility model aims to provide a sulfur refining device for coke oven gas desulfurization waste liquid, by which sulfur in the desulfurization waste liquid is treated to obtain refined sulfur products, thereby achieving the goals of low energy consumption, continuous automated production, high active safety performance, high product purity and good on-site operating environment.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The sulfur refining device for the waste liquid of desulfurization of coke oven gas, the concentration filter, the concentrated sulfur foam tank, the molten sulfur kettle, the steam-water separator, the deslagging furnace, the gasifier, the primary cooler, the secondary cooler, the liquid sulfur tank, the granulator, and the chute are connected in sequence through pipelines; the tail gas purification system is connected with the concentrated foam tank, the steam-water separator, the deslagging furnace, the secondary cooler, the liquid sulfur tank, the granulator, and the scraper slag remover; the scraper slag remover is connected with the molten sulfur kettle, the steam-water separator, the deslagging furnace, and the gasifier.

[0007] The concentration filter uses positive pressure to filter the liquid using a filter membrane with surface filtering properties, which can effectively remove solid particles and suspended matter in the liquid, thereby concentrating the sulfur-containing foam liquid and increasing the sulfur content.

[0008] The concentrated sulfur foam tank is made of PPH material and is provided with a stirring device.

[0009] The sulfur melting kettle mainly includes internal parts, an inner cylinder and a steam jacket. The continuous melting kettle can integrate the separation, melting and recovery of sulfur in sulfur foam. Under normal working conditions, in the sulfur-containing foam liquid, sulfur is attached to the foam in the form of tiny particles of elemental sulfur. After the sulfur-containing foam liquid enters the sulfur melting kettle, steam is introduced into the jacket to heat the sulfur foam so that the elemental sulfur melts into liquid sulfur that is easy to flow, and relies on gravity to separate from water and enter the steam-water separator through the steam jacket pipe.

[0010] The steam-water separator is connected to the sulfur melting kettle through a steam jacket pipe. The liquid sulfur discharged from the sulfur melting kettle contains a small amount of water, which is separated by the steam-water separator. The sedimentation separation is mainly carried out by using the density difference between liquid sulfur and water. After standing for a certain period of time, the liquid sulfur with a higher density is discharged from the bottom, and the water with a lower density is evaporated and discharged from the upper part.

[0011] The deslagging furnace and gasification furnace are electrically heated by a medium frequency furnace, lined with crucible material, and are sealed equipment. They are equipped with an oxygen content alarm detection system and a nitrogen protection steam fire extinguishing protection device. The impurities in the liquid sulfur are vaporized and separated by heating in the deslagging furnace, and enter the tail gas purification system through the steam jacket pipeline. The liquid sulfur is further heated in the gasification furnace to vaporize it, and separated from the impurities that cannot be vaporized to obtain gaseous sulfur.

[0012] The primary cooler and the secondary cooler use circulating cooling water to cool down, so that the gaseous sulfur is condensed into liquid sulfur and enters the liquid sulfur tank for storage, and the non-condensable steam of gaseous impurities is discharged to the tail gas purification system through the steam jacket pipeline of the secondary cooler.

[0013] The liquid sulfur tank is made of stainless steel, insulated by a steam coil, and equipped with nitrogen protection and steam fire extinguishing devices. A submersible pump is used to pump the liquid sulfur to the granulator through a steam jacketed pipe.

[0014] The granulator is composed of a filtering unit, a granulating distributor system, a rotating steel belt, a spray cooling system, and a special release agent coating system. Liquid sulfur is quickly and effectively converted into finished granules with regular shape, uniform particle size, stable performance, and convenient for use in the granulator.

[0015] The exhaust gas purification system is composed of a glass fiber reinforced plastic spray tower, a circulation pump, an activated carbon adsorption box, a fan, and a chimney. The collected gas is sequentially washed with water, washed with alkali, and adsorbed with activated carbon, and then discharged after meeting environmental protection requirements.

[0016] The scraper slag scooping machine collects the slag in the sulfur melting kettle, the steam-water separator, the slag discharge furnace and the gasification furnace, and scoops out the slag with the scraper and packs it into bags for treatment.

[0017] Principle of the utility model: the sulfur foam generated by the coking desulfurization system enters the concentration filter, the concentrated sulfur foam enters the concentrated sulfur foam tank for storage, and the filtered clear liquid returns to the coking desulfurization system; the concentrated sulfur foam is pumped into the sulfur melting kettle for sulfur melting, and the separated sulfur melting residual liquid returns to the coking desulfurization system, and the crude liquid sulfur enters the steam-water separator; the steam-water separator evaporates the water in the liquid sulfur, the crude liquid sulfur enters the slag discharge furnace for heating, and the gasifiable tar gas is separated; the liquid sulfur enters the gasification furnace for further heating, the sulfur gasifies and enters the cooler, and the waste slag that cannot be gasified is discharged into the scraper slag remover; the gaseous sulfur is condensed into liquid sulfur in the cooler and enters the liquid sulfur tank for storage, and the non-condensable steam is sent to the exhaust gas purification system for treatment; the liquid sulfur in the liquid sulfur tank is sent to the granulator through the liquid sulfur pump to obtain the finished refined sulfur; the exhaust gas from the concentrated foam tank, the steam-water separator, the slag discharge furnace, and the cooler is collected in the exhaust gas purification system, and is discharged after being treated by water washing, alkali washing and other processes to meet the standards.

[0018] The beneficial effects of the utility model are as follows: the sulfur foam in the desulfurization waste liquid is purified and refined to obtain a refined sulfur product, realizing the resource utilization of solid waste. The device has the characteristics of low energy consumption, continuous automatic production, high active safety performance, high product purity, and good on-site operating environment. The sulfur in the sulfur foam is concentrated by a concentration filter, which greatly reduces the energy consumption required for sulfur melting; an internal sulfur melting kettle is used to achieve continuous sulfur melting; the automatic control system controls the steam-water separator, slag discharge furnace, gasification furnace and other equipment to achieve continuous and efficient separation of sulfur and impurities, greatly improving the purity of sulfur and obtaining a refined sulfur product; the slag discharge furnace and gasification furnace implement oxygen detection and nitrogen and steam interlock protection, which improves the active safety of the device; all devices are sealed and equipped with an exhaust gas collection system to ensure a good operating environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the system structure diagram of the coke oven gas desulfurization waste liquid sulfur refining device.

[0020] In the figure: 1-concentration filter; 2-concentrated sulfur foam tank; 3-molten sulfur kettle; 4-steam-water separator; 5-slag discharge furnace; 6-gasification furnace; 7-primary cooler; 8-secondary cooler; 9-liquid sulfur tank; 10-granulator; 11-chute; 12-exhaust gas purification system; 13-scraper slag remover. DETAILED DESCRIPTION

[0021] The following is a description of the embodiments with reference to the accompanying drawings.

[0022] like Figure 1As shown, in the sulfur refining device for desulfurization waste liquid of coke oven gas, a concentration filter 1, a concentrated sulfur foam tank 2, a molten sulfur kettle 3, a steam-water separator 4, a slag discharge furnace 5, a gasifier 6, a primary cooler 7, a secondary cooler 8, a liquid sulfur tank 9, a granulator 10, and a chute 11 are sequentially connected through pipelines; a tail gas purification system 12 is connected to the concentrated sulfur foam tank 2, the steam-water separator 3, the slag discharge furnace 5, the secondary cooler 8, the liquid sulfur tank 9, the granulator 10, and a scraper slag remover 13, and the scraper slag remover 13 is connected to the molten sulfur kettle 3, the steam-water separator 4, the slag discharge furnace 5, and the gasifier 6.

[0023] The concentration filter 1 uses positive pressure filtration and uses a filter membrane with surface filtration performance to effectively remove solid particles and suspended matter in the liquid, thereby concentrating the sulfur-containing foam liquid and increasing the sulfur content.

[0024] The concentrated sulfur foam tank 2 is made of PPH material and is provided with a stirring device.

[0025] The sulfur melting kettle 3 includes internal parts, an inner cylinder and a steam jacket. The continuous sulfur melting kettle 3 can integrate the separation, melting and recovery of sulfur in sulfur foam. Under normal working conditions, in the sulfur-containing foam liquid, sulfur is attached to the foam in the form of tiny particles of elemental sulfur. After the sulfur-containing foam liquid enters the sulfur melting kettle 2, steam is introduced into the jacket to heat the sulfur foam so that the elemental sulfur melts into liquid sulfur that is easy to flow, and relies on gravity to separate from water and enter the steam-water separator 4 through the steam jacket pipe.

[0026] The steam-water separator 4 is connected to the sulfur melting kettle 3 through a steam jacket pipe. The liquid sulfur discharged from the sulfur melting kettle 3 contains a small amount of water, which is separated by the steam-water separator 4. The sedimentation separation is mainly carried out by using the density difference between liquid sulfur and water. After a certain period of standing, the liquid sulfur with a higher density is discharged from the bottom, and the water with a lower density is evaporated and discharged from the top.

[0027] The deslagging furnace 5 and the gasification furnace 6 are electrically heated by the medium frequency furnace, lined with crucible material, and are sealed equipment. They are equipped with an oxygen content alarm detection system and a nitrogen protection steam fire extinguishing protection device. The impurities in the liquid sulfur are vaporized and separated by heating in the deslagging furnace 5, and enter the tail gas purification system through the steam jacket pipeline. The liquid sulfur is further heated in the gasification furnace 6 to vaporize it and separate it from the impurities that cannot be vaporized to obtain gaseous sulfur.

[0028] The primary cooler 7 and the secondary cooler 8 use circulating cooling water to cool down, so that the gaseous sulfur is condensed into liquid sulfur and enters the liquid sulfur tank 9 for storage, and the non-condensable steam of the gaseous impurities is discharged to the tail gas purification system through the steam jacket pipeline of the secondary cooler 8.

[0029] The liquid sulfur tank 9 is made of stainless steel, is insulated by a steam coil, and is equipped with a nitrogen protection and steam fire extinguishing device. The liquid sulfur is pumped to the granulator 10 through a steam jacketed pipe by a submersible pump.

[0030] The granulator 10 is composed of a filtering unit, a granulator distributor system, a rotating steel belt and a spray cooling system, and a special release agent coating system. Liquid sulfur is quickly and effectively converted into finished granules with regular shape, uniform particle size, stable performance, and convenient for use in the granulator 10.

[0031] The tail gas purification system 12 is composed of a glass fiber reinforced plastic spray tower, a circulation pump, an activated carbon adsorption box, a fan, and a chimney. The collected gas is sequentially washed with water, washed with alkali, and adsorbed with activated carbon, and then discharged after meeting environmental protection requirements.

[0032] The scraper slag scooping machine 13 collects the slag in the molten sulfur kettle 3, the steam-water separator 4, the slag discharge furnace 5, and the gasification furnace 6, and scoops out the slag with a scraper and packs it in bags for treatment.

[0033] Working process of the coke oven gas desulfurization waste liquid refined sulfur device:

[0034] 1) The desulfurization waste liquid containing sulfur foam enters the concentration filter 1, the filtered clear liquid returns to the desulfurization system, and the concentrated sulfur foam enters the concentrated sulfur foam tank 2; the tail gas generated in the concentrated foam tank 2 is pumped to the tail gas purification system 12.

[0035] 2) The concentrated sulfur foam is transported to the sulfur melting kettle 3 through a liquid sulfur pump for sulfur melting. The sulfur melting temperature is controlled at 135-155°C. The liquid sulfur is separated from the water under the action of gravity. The upper sulfur residue is returned to the desulfurization system, and the lower liquid sulfur enters the steam-water separator 4. The sulfur slag is regularly discharged to the scraper slag machine 13.

[0036] 3) The temperature of the steam-water separator 4 is controlled at 120-130°C, and the liquid sulfur is further dehydrated and decontaminated. The generated tail gas enters the tail gas purification system, and the liquid sulfur enters the slag discharge furnace. The waste slag at the bottom of the steam-water separator is regularly discharged to the scraper slag remover.

[0037] 4) The temperature of the slag discharge furnace is controlled at 300~380℃. Part of the impurities in the liquid sulfur are gasified and enter the tail gas purification system. The infusible waste slag sinks to the bottom and is regularly discharged to the scraper slag remover. The purified liquid sulfur enters the gasifier.

[0038] 5) The temperature of the gasifier is controlled between 435 and 450°C. The sulfur is gasified and enters the primary cooler. The waste slag that cannot be vaporized sinks to the bottom and is regularly discharged to the scraper slag remover.

[0039] 6) The slag discharge furnace and gasification furnace use nitrogen as the protective gas, and the fire will be automatically extinguished when the oxygen content in the furnace reaches the set value.

[0040] 7) The gaseous sulfur is cooled to 200~300℃ in the primary cooler to become liquid sulfur and enter the secondary cooler.

[0041] 8) Liquid sulfur is cooled to 150~200℃ in the secondary cooler and enters the liquid sulfur tank, and the non-condensable gas enters the tail gas purification system.

[0042] 9) The temperature of the liquid sulfur tank is controlled at about 150°C, and the liquid sulfur is processed into products through a granulator.

[0043] 10) Exhaust gas meets emission standards after being treated by the exhaust gas purification system.

Claims

1. A device for refining sulfur from coke oven gas desulfurization waste liquid, characterized by: The concentration filter, concentrated sulfur foam tank, molten sulfur kettle, steam-water separator, slag furnace, gasifier, primary cooler, secondary cooler, liquid sulfur tank, and granulator are connected in sequence through pipelines. The tail gas purification system is connected with the concentrated sulfur foam tank, steam-water separator, slag furnace, secondary cooler, liquid sulfur tank, granulator, and scraper slag remover. The scraper slag remover is connected with the molten sulfur kettle, steam-water separator, slag furnace, and gasifier. The filtration mode of the concentration filter is positive pressure, and a filter membrane with surface filtration performance is adopted. The concentrated sulfur foam tank is made of PPH material and is provided with a stirring device. The molten sulfur kettle is a continuous molten sulfur kettle, including internal parts, inner cylinder and steam jacket, integrating the separation, melting and recovery of sulfur in sulfur foam. The steam-water separator is connected with the molten sulfur kettle through a steam jacket pipe, and the density difference between liquid sulfur and water is used for sedimentation separation. The slag furnace and gasifier are sealed equipment, which are electrically heated by a medium frequency furnace, lined with crucible material, and are provided with an oxygen content alarm detection system. and a nitrogen protection steam fire extinguishing protection device; the first-level cooler and the second-level cooler use circulating cooling water to cool down, so that the gaseous sulfur is condensed into refined sulfur and enters the liquid sulfur tank for storage, and the gaseous impurities are discharged to the tail gas purification system through the steam jacket pipe of the second-level cooler without condensation; the liquid sulfur tank is made of stainless steel, insulated by a steam coil, and is equipped with nitrogen protection and steam fire extinguishing devices, and a submersible pump is used to pump the liquid sulfur to the granulator through the steam jacket pipe; the granulator is composed of a filtering unit, a granulation distributor system, a rotating steel belt and a spray cooling system, and a special release agent coating system; the tail gas purification system is composed of a glass fiber reinforced plastic spray tower, a circulating pump, an activated carbon adsorption box, a fan, and a chimney, which is used to collect the gas through water washing, alkali washing, and activated carbon adsorption in sequence and then discharge it after meeting the environmental protection requirements; the scraper slag scooping machine is used to collect the slag in the molten sulfur kettle, the steam-water separator, the slag discharge furnace, and the gasification furnace, and the slag is scooped out with a scraper and packaged in bags for processing.

Images