CN210711126U - Sintering furnace flue gas desulfurization denitration acid-making wastewater recycling system - Google Patents
Sintering furnace flue gas desulfurization denitration acid-making wastewater recycling system Download PDFInfo
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- CN210711126U CN210711126U CN201921576630.8U CN201921576630U CN210711126U CN 210711126 U CN210711126 U CN 210711126U CN 201921576630 U CN201921576630 U CN 201921576630U CN 210711126 U CN210711126 U CN 210711126U
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Abstract
The utility model discloses a sintering furnace flue gas desulfurization denitration system acid waste water recycle system, its characterized in that: workshop waste water at first gets into the equalizing basin, gets into integration coagulating sedimentation ware after adjusting quality of water yield in the equalizing basin, the clear solution of integration coagulating sedimentation ware gets into middle pond after the filter filters, the water in middle pond gets into evaporation system, gets rid of a large amount of salts that contain in the waste water, evaporation system's crystal salt has handed over the unit of qualification to be handled, evaporation system's comdenstion water gets into secondary coagulating sedimentation ware after condensate water process condensate water pond is kept in, secondary coagulating sedimentation ware's play water gets into secondary filter and filters, follows the water that secondary filter came out gets into the clean water basin and finally carries to the retrieval and utilization water point. The system is simple and reliable in operation, the cost investment of enterprises is greatly reduced, and the economic benefit and the social benefit of the enterprises are improved.
Description
Technical Field
The utility model relates to a sintering furnace flue gas desulfurization denitration system acid waste water recycle system belongs to the water treatment field.
Background
In the desulfurization and denitrification process of the activated carbon in the sintering flue gas of the steel plant, the activated carbon is adopted to adsorb SO in the flue gas2、NOxAnd heavy metal ions and other pollutants. The activated carbon with saturated adsorption is conveyed to a desorption tower for high-temperature desorption, and SO is absorbed in the desorption tower2When the acid gas is released in a gaseous state, some heavy metals in a gaseous state or a dust state are also carried out by the desorption gas. In order to improve the desulfurization and denitrification efficiency, ammonia with a theoretical value of 1.05-1.2 times is sprayed in the adsorption process, SO that redundant ammonia is released from the activated carbon in the high-temperature desorption process, and the desorbed waste gas is enriched with high-concentration SO2、NH4 +Pollutants such as heavy metal ions and dust generated by aging and abrasion of the activated carbon.
In order to realize the recycling of resources, the SO is rich2The desorption waste gas is sent to an acid making working section to prepare sulfuric acid. Because the desorption waste gas for preparing acid contains high-concentration SO2Besides, almost all other harmful impurities in the sintering flue gas are enriched, in order to ensure the purity of the sulfuric acid product, dilute sulfuric acid is needed to wash and purify the waste gas before acid preparation, and NH in the waste gas4 +Metal ions and dust suspension are transferred into dilute sulfuric acid. The waste acid solution generated by the washing operation is the wastewater of the activated carbon desulfurization and denitrification acid making process which needs to be treated by the application. The water quality is as follows
The total salt content of the wastewater is very high, the wastewater cannot be directly discharged or enters other systems for treatment, and the wastewater simultaneously contains chloride and fluoride with higher concentration, has strong corrosivity on equipment and needs targeted pretreatment.
SUMMERY OF THE UTILITY MODEL
To the technical problem, an object of the utility model is to provide a sintering furnace flue gas desulfurization denitration system acid waste water recycle system realizes the recycle of waste water.
In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides a sintering furnace flue gas desulfurization denitration system acid waste water recycle system which characterized in that: workshop waste water at first gets into the equalizing basin, gets into integration coagulating sedimentation ware after adjusting quality of water yield in the equalizing basin, the clear solution of integration coagulating sedimentation ware gets into middle pond after the filter filters, the water in middle pond gets into evaporation system, gets rid of a large amount of salts that contain in the waste water, evaporation system's crystal salt has handed over the unit of qualification to be handled, evaporation system's comdenstion water gets into secondary coagulating sedimentation ware after condensate water process condensate water pond is kept in, secondary coagulating sedimentation ware's play water gets into secondary filter and filters, follows the water that secondary filter came out gets into the clean water basin and finally carries to the retrieval and utilization water point.
By adopting the scheme, the workshop incoming water enters the regulating tank, and after the water quantity and the water quality are regulated, the pump is lifted to the integrated coagulating sedimentation device, so that F, SS, heavy metals and other pollutants contained in the wastewater are removed.
And the effluent treated by the integrated coagulating sedimentation device enters a filter to further remove the particulate pollutants in the wastewater.
The effluent treated by the filter enters an intermediate water tank, and the wastewater is lifted to an evaporation system by a pump to remove a large amount of salts in the wastewater.
And (3) the condensed water treated by the evaporation system enters a secondary coagulating sedimentation device, magnesium salt and phosphate are added by adopting an ammonium magnesium phosphate precipitation method to react with ammonium radicals to generate sediment (struvite), PAC and PAM are added to generate large alum floc, and the large alum floc is removed by sludge discharge. Can remove a large amount of pollutants such as ammonia nitrogen and the like contained in the wastewater.
And the effluent treated by the secondary coagulating sedimentation device enters a filter to further remove pollutants such as ammonia nitrogen, SS and the like contained in the wastewater.
The effluent filtered by the filter enters a clean water tank and is stored and recycled to a recycling water point, such as raw water or other washing water of a workshop RO system.
In the scheme, the method comprises the following steps: the water of the clean water tank is connected with backwashing water inlets of the filter and the secondary filter through a backwashing pump, and backwashing water outlets of the filter and the secondary filter are connected with the regulating tank. And back washing the filter and the secondary filter by using a clean water tank.
In the scheme, the method comprises the following steps: the sludge of the integrated coagulating sedimentation device and the secondary coagulating sedimentation device enters a sludge tank, and the sludge in the sludge tank is transported outside after being dewatered by a dewatering machine.
In the scheme, the method comprises the following steps: and the supernatant of the sludge tank and the filtrate of the dehydrator enter an adjusting tank.
Has the advantages that: the utility model discloses a flue gas desulfurization denitration system acid manufacturing waste water recycling system, waste water finally make pollutants such as ammonia nitrogen, heavy metal in the waste water effectively get rid of, stably satisfy workshop retrieval and utilization water standard after integration coagulating sedimentation ware deposits, filters, evaporation, secondary coagulating sedimentation removes ammonia nitrogen and secondary filter filters, realizes the recycle of waste water. The system is simple and reliable in operation, the cost investment of enterprises is greatly reduced, and the economic benefit and the social benefit of the enterprises are improved.
Drawings
Fig. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will be further described by way of examples with reference to the accompanying drawings:
example 1
The water quality of the inlet water of the flue gas desulfurization and denitrification acid making wastewater is as follows:
as shown in figure 1, the flue gas desulfurization and denitrification acid-making wastewater recycling system consists of a regulating tank 1, an integrated coagulating sedimentation device 2, a filter 3, an intermediate water tank 4, an evaporation system 5, a condensation water tank 6, a secondary coagulating sedimentation device 7, a secondary filter 8, a clean water tank 9, a sludge tank 10 and a dehydrator 11
Workshop waste water firstly enters an adjusting tank 1, enters an integrated coagulating sedimentation device 2 after the water quality and the water quantity are adjusted in the adjusting tank 1, calcium chloride is added into the integrated coagulating sedimentation device until the calcium chloride is excessive to generate calcium fluoride precipitate, alkali is added to adjust the pH value of 10-11, PAC and PAM are added until large alum floc is generated, and pollutants such as F, SS, ammonia nitrogen, heavy metals and the like contained in the waste water are removed. The sludge of the integrated coagulating sedimentation device 2 enters a sludge tank 10, and the sludge in the sludge tank 10 is dewatered by a dewatering machine 11 and then transported out. The supernatant of the sludge tank 10 and the filtrate of the dehydrator 11 enter the adjusting tank.
Clear liquid of the integrated coagulating sedimentation device 2 enters an intermediate water tank 4 after being filtered by a filter 3, the filter 3 is used for further removing particulate matters, and water in the intermediate water tank 4 is pumped into an evaporation system 5 by a pump to remove a large amount of salts contained in the wastewater. The method comprises the following steps of treating crystal salt of an evaporation system 5 with qualified units, enabling condensate water of the evaporation system 5 to enter a condensate water tank 6, enabling water of the condensate water tank 6 to enter a secondary coagulating sedimentation device 7, adding magnesium salt and phosphate into the secondary coagulating sedimentation device 7 by adopting an ammonium magnesium phosphate precipitation method, reacting with ammonium radicals to generate sediment (struvite), adding PAC and PAM to generate large alum floc, and removing the alum floc through sludge discharge. Can remove a large amount of pollutants such as ammonia nitrogen and the like contained in the wastewater. The sludge of the secondary coagulating sedimentation device 7 enters a sludge tank 10.
The effluent of the secondary coagulating sedimentation device 7 enters a secondary filter 8, and particulate matters are filtered and removed in the secondary filter 8. Further removing pollutants such as ammonia nitrogen, SS and the like contained in the wastewater.
The water from the secondary filter 8 enters a clean water tank 9 and is finally conveyed to a reuse water point. The water of the clean water tank 9 is connected with the back washing water inlets of the filter 3 and the secondary filter 8 through a back washing pump, and the back washing water outlets of the filter 3 and the secondary filter 8 are connected with the regulating tank 1.
Finally, the quality of the discharged water treated by the system can stably reach the standard of the reuse water formulated in a workshop, and the quality of the discharged water meets the following requirements.
| Serial number | Name (R) | Unit of | Number of |
| 1 | Ammonia nitrogen | mg/L | ≤10 |
| 2 | pH | 6-9 | |
| 3 | Total mercury | mg/L | ＜0.05 |
| 4 | Iron | mg/L | ＜10 |
| 5 | Lead (II) | mg/L | ＜1 |
| 6 | Calcium carbonate | mg/L | ＜100 |
| 7 | Total dissolved solids | mg/L | ＜500 |
The effluent quality does not meet the requirements of the emission standard of pollutants for the steel industry GB13456-2012, but the main indexes except ammonia nitrogen are all better than the tap water quality, and the effluent can be recycled according to the water balance of a plant area and the water consumption condition of each workshop.
The present invention is not limited to the above embodiments, and those skilled in the art can understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. The utility model provides a sintering furnace flue gas desulfurization denitration system acid waste water recycle system which characterized in that: workshop waste water at first gets into the equalizing basin, gets into integration coagulating sedimentation ware after adjusting quality of water yield in the equalizing basin, the clear solution of integration coagulating sedimentation ware gets into middle pond after the filter filters, the water in middle pond gets into evaporation system, gets rid of a large amount of salts that contain in the waste water, evaporation system's crystal salt has handed over the unit of qualification to be handled, evaporation system's comdenstion water gets into secondary coagulating sedimentation ware after condensate water process condensate water pond is kept in, secondary coagulating sedimentation ware's play water gets into secondary filter and filters, follows the water that secondary filter came out gets into the clean water basin and finally carries to the retrieval and utilization water point.
2. The system for recycling the acid making wastewater from the desulfurization and denitrification of the flue gas of the sintering furnace according to claim 1, characterized in that: the water of the clean water tank is connected with backwashing water inlets of the filter and the secondary filter through a backwashing pump, and backwashing water outlets of the filter and the secondary filter are connected with the regulating tank.
3. The sintering furnace flue gas desulfurization and denitrification acid-making wastewater recycling system according to claim 1 or 2, characterized in that: the sludge of the integrated coagulating sedimentation device and the secondary coagulating sedimentation device enters a sludge tank, and the sludge in the sludge tank is transported outside after being dewatered by a dewatering machine.
4. The system for recycling the acid making wastewater from the desulfurization and denitrification of the flue gas of the sintering furnace according to claim 3, characterized in that: and the supernatant of the sludge tank and the filtrate of the dehydrator enter an adjusting tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921576630.8U CN210711126U (en) | 2019-09-20 | 2019-09-20 | Sintering furnace flue gas desulfurization denitration acid-making wastewater recycling system |
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| CN201921576630.8U CN210711126U (en) | 2019-09-20 | 2019-09-20 | Sintering furnace flue gas desulfurization denitration acid-making wastewater recycling system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113087266A (en) * | 2021-04-30 | 2021-07-09 | 北京首钢国际工程技术有限公司 | Control method suitable for zero discharge of sintering pellet desulfurization and denitrification acid making wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113087266A (en) * | 2021-04-30 | 2021-07-09 | 北京首钢国际工程技术有限公司 | Control method suitable for zero discharge of sintering pellet desulfurization and denitrification acid making wastewater |
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Effective date of registration: 20221009 Address after: 31-a3, Tower B, 2 Nanping West Road, Nan'an District, Chongqing 400060 Patentee after: CHONGQING JIERUN TECHNOLOGY Co.,Ltd. Address before: 400015 2-5, No.4, jialingqiao West Village, Yuzhong District, Chongqing Patentee before: Chongqing Si Tong Technology Co.,Ltd. |
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