CN111001445A - System and method for recycling weak acid cation bed regeneration wastewater of thermal power plant according to quality - Google Patents
System and method for recycling weak acid cation bed regeneration wastewater of thermal power plant according to quality Download PDFInfo
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- CN111001445A CN111001445A CN201911364074.2A CN201911364074A CN111001445A CN 111001445 A CN111001445 A CN 111001445A CN 201911364074 A CN201911364074 A CN 201911364074A CN 111001445 A CN111001445 A CN 111001445A
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Abstract
The invention discloses a system and a method for recycling regenerated wastewater of a weak acid cation bed of a thermal power plant according to the quality, wherein the system comprises the weak acid cation bed, a drainage ditch, a wastewater collecting pool, a cooling tower and a desulfurization reuse water pool; the invention optimally designs the starting and stopping of the pump aiming at the regeneration step sequence characteristics of the weak acid cation bed, and can realize the separate collection and recycling of the flushing water and the regeneration wastewater in the regeneration stage of the weak acid cation bed. In addition, a certain amount of cooling tower circulating water is introduced in the regeneration and replacement stage to dilute, neutralize and inhibit scale of the regeneration wastewater, so that scaling of calcium sulfate in a wastewater pool and a conveying pipeline can be effectively avoided, the amount of alkali used for neutralization is reduced, and the problem of recycling of weak acid cation bed regeneration wastewater is well solved.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to a system and a method for recycling weak acid cation bed regeneration wastewater of a thermal power plant according to the quality.
Background
The weak acid cation bed is a common water treatment device in a thermal power plant, generally adopts sulfuric acid regeneration, and the regeneration process comprises the following steps: stopping → backwashing → acid regeneration → replacement → forward washing → commissioning. The water for regeneration is softened water, and generally, a regeneration period is about 4 hours. All the wastewater in the regeneration stage is discharged to a wastewater collection tank through a drainage ditch at present, and the wastewater is reused or discharged after being adjusted by adding alkali and pH. However, the amount of wastewater generated by the regeneration wastewater collection treatment process is large, the wastewater is not recycled according to quality, calcium sulfate precipitates are easily formed due to the fact that the wastewater contains a large amount of calcium ions and sulfate ions, scaling is separated out in a wastewater tank, a wastewater pump and a conveying pipeline, so that blockage and equipment failure are caused, the wastewater tank is generally cleaned manually 3-4 times every year, and a wastewater discharge system is cleaned chemically in 1-2 years.
Disclosure of Invention
The invention aims to provide a system and a method for recycling weak acid cation bed regeneration wastewater of a thermal power plant according to the quality aiming at the defects of the conventional technology, which can realize the recycling of washing water and regeneration wastewater in a regeneration stage according to the quality, can effectively avoid the precipitation and scaling of calcium sulfate in a wastewater pool and a conveying pipeline, reduce the amount of neutralizing alkali, and better solve the problem of recycling the weak acid cation bed regeneration wastewater.
The technical scheme adopted by the invention for solving the problems is as follows: a heat-engine plant weak acid cation bed regeneration wastewater quality-based recycling system is characterized by comprising a weak acid cation bed, a drainage ditch, a wastewater collection pool, a cooling tower and a desulfurization reuse water pool; the regeneration outlet and the escape canal intercommunication of weak acid cation bed, escape canal and wastewater collection pond intercommunication, wastewater collection pond is connected with the alkali device, wastewater collection pond is through the water inlet intercommunication of recycled water pipe with the cooling tower, the last reclaimed water pump of installing of recycled water pipe, wastewater collection pond is still through the water inlet intercommunication in multiplexing water pipe and the multiplexing pond of desulfurization, install multiplexing water pump on the multiplexing water pipe, circulating water drain pipe and wastewater collection pond intercommunication are passed through to the outlet of cooling tower, the last circulating water drain pump of installing of circulating water drain pipe.
Further, the recovery water pump and the reuse water pump are arranged in parallel.
Furthermore, a valve is installed on the recycling water pipe, a recycling branch is led out of the recycling water pipe, the recycling branch is communicated to the waste water collecting tank, and the valve is installed on the recycling branch.
Furthermore, a valve is installed on the reuse water pipe, a recirculation branch is led out of the reuse water pipe, the recirculation branch is communicated to the waste water collecting tank, and the valve is installed on the recirculation branch.
Furthermore, a valve is arranged on the circulating water drainage pipe.
Further, the weak acid cation bed is regenerated by sulfuric acid.
The working method of the weak acid cation bed regeneration wastewater separate recycling system of the thermal power plant is characterized in that the regeneration process of the weak acid cation bed comprises the following steps: the process comprises the following steps of shut-down → backwashing → acid regeneration → replacement → forward washing → delivery, and the quality-based recycling process is as follows:
a) backwashing is carried out after the weak acid cation bed is stopped, backwashing drainage enters a wastewater collection pool through a drainage ditch, and after backwashing is finished, a recovery water pump is started to recover the backwashing drainage to a cooling tower until the wastewater collection pool reaches the lowest liquid level; the backwashing drainage is close to the water quality of the raw water, the total dissolved solid is low, the turbidity is low, the hardness is low, the water quality is good, and the water quality requirement of the cooling tower for water supplement is basically met;
b) feeding acid into a weak acid cation bed for regeneration and replacement, feeding regenerated wastewater into a wastewater collection tank through a drainage ditch, simultaneously starting a circulating water drainage pump, sending circulating water in a cooling tower to the wastewater collection tank to be fully mixed with the regenerated wastewater, stopping running the circulating water drainage pump after replacement is finished, then putting an alkali adding device into operation to adjust the pH value, starting a reuse water pump after the pH value is qualified, and sending the mixed wastewater to a desulfurization reuse water tank to be used as process water replenishing water of a limestone-gypsum wet desulfurization system until the wastewater collection tank reaches the lowest liquid level;
c) the weak acid cation bed is washed before being put into operation, the water drained by the washing enters a wastewater collection pool through a drainage ditch, and after the washing is finished, a recovery water pump is started to recover the water drained by the washing to a cooling tower until the wastewater collection pool reaches the lowest liquid level; the quality of the forward washing drainage is close to that of raw water, the total dissolved solid is low, the turbidity is low, the hardness is low, the water quality is good, and the water quality requirement of a cooling tower for water supplement is basically met.
Compared with the prior art, the invention has the following advantages and effects:
1) the regeneration step sequence characteristic of the weak acid cation bed is fully utilized, backwashing and forward washing drainage with good water quality is effectively recovered, and the regeneration wastewater amount is reduced by about 50%;
2) a certain amount of circulating water is introduced into the weak acid regeneration wastewater, so that the effect of diluting can be achieved, the concentrations of calcium ions and sulfate ions in the wastewater are greatly reduced, and calcium sulfate is not easy to separate out;
3) a certain amount of circulating water is introduced into the weak acid regeneration wastewater, and the water quality stabilizer reserved in the circulating water can play a role in inhibiting calcium sulfate scaling to a certain extent;
4) circulating water (30-40 ℃) with relatively high temperature is introduced into the weak acid regeneration wastewater, so that the water temperature of the wastewater is increased, and the solubility of calcium sulfate is increased;
5) circulating water (8.5-9) with relatively high pH is introduced into the weak acid regeneration wastewater, so that an acid-base neutralization effect can be achieved, the pH value of the wastewater is increased, and the solubility of calcium sulfate is increased.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: weak acid cation bed 1, escape canal 2, waste water collecting pool 3, add alkali device 4, recovery water pump 5, cooling tower 6, multiplexing water pump 7, desulfurization multiplexing pond 8, circulating water drain pump 9, recycled water pipe 10, circulating water drain pipe 11, multiplexing water pipe 12.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Example 1.
Referring to fig. 1, in this embodiment, a weak acid cation bed regeneration wastewater quality-divided recycling system for a thermal power plant includes a weak acid cation bed 1, a drainage ditch 2, a wastewater collection tank 3, an alkali adding device 4, a recovery water pump 5, a cooling tower 6, a reuse water pump 7, a desulfurization reuse water tank 8, and a circulating water drainage pump 9.
Weak acid cation bed 1's regeneration outlet and escape canal 2 intercommunication, escape canal 2 and waste water collecting tank 3 intercommunication, waste water collecting tank 3 is connected with alkalifying device 4, waste water collecting tank 3 communicates through the water inlet of recycled water pipe 10 with cooling tower 6, install recycled water pump 5 on the recycled water pipe 10, waste water collecting tank 3 still communicates with the water inlet of the multiplexing pond 8 of desulfurization through multiplexing water pipe 12, install multiplexing water pump 7 on multiplexing water pipe 12, the outlet of cooling tower 6 passes through circulating water drain pipe 11 and waste water collecting tank 3 intercommunication, install circulating water drain pump 9 on circulating water drain pipe 11.
In this embodiment, the recycle water pump 5 and the reuse water pump 7 are arranged in parallel, and the recycle water pump 5, the reuse water pump 7 and the circulating water drain pump 9 are all provided with a plurality of.
In this embodiment, a valve is installed on the recycling water pipe 10, a recycling branch is led out from the recycling water pipe 10, the recycling branch is communicated to the waste water collecting tank 3, and the valve is installed on the recycling branch. The valve is arranged on the multiplexing water pipe 12, a recirculation branch is led out from the multiplexing water pipe 12 and communicated to the waste water collecting tank 3, and the valve is arranged on the recirculation branch. And a valve is arranged on the circulating water drainage pipe 11.
In this example, the weak acid cation bed 1 is regenerated with sulfuric acid.
The working process is as follows: the regeneration process of the weak acid cation bed 1 comprises the following steps: the process comprises the following steps of shut-down → backwashing → acid regeneration → replacement → forward washing → delivery, and the quality-based recycling process is as follows:
a) after the weak acid cation bed 1 is shut down, backwashing is firstly carried out, backwashing drainage enters a wastewater collection tank 3 through a drainage ditch 2, after backwashing is finished, a recovery water pump 5 is started, backwashing drainage is recovered to a cooling tower 6 until the wastewater collection tank 3 reaches the lowest liquid level; the backwashing drainage is close to the water quality of the raw water, the total dissolved solid is low, the turbidity is low, the hardness is low, the water quality is good, and the water quality requirement of the cooling tower for water supplement is basically met;
b) acid is fed into a weak acid cation bed 1 for regeneration and replacement, regenerated wastewater enters a wastewater collection tank 3 through a drainage ditch 2, a circulating water drainage pump 9 is started at the same time, circulating water in a cooling tower 6 is sent to the wastewater collection tank 3 to be fully mixed with the regenerated wastewater, the circulating water drainage pump 9 is stopped after replacement is finished, then an alkali adding device 4 is put into operation to adjust the pH value, a reuse water pump 7 is started after the pH value is qualified, and the mixed wastewater is sent to a desulfurization reuse water tank 8 to be used as process water supplement of a limestone-gypsum wet desulfurization system until the wastewater collection tank 3 reaches the lowest liquid level;
c) the weak acid cation bed 1 is washed before being put into operation, the forward washing drainage enters a wastewater collection pool 3 through a drainage ditch 2, and after the forward washing is finished, a recovery water pump 5 is started to recover the forward washing drainage to a cooling tower 6 until the wastewater collection pool 3 reaches the lowest liquid level; the quality of the forward washing drainage is close to that of raw water, the total dissolved solid is low, the turbidity is low, the hardness is low, the water quality is good, and the water quality requirement of a cooling tower for water supplement is basically met.
The quality-divided recycling process makes full use of the regeneration step sequence characteristic of the weak acid cation bed 1, and recycles backwashing and forward washing drainage water with better water quality to the cooling tower 6 to be used as water supplement, so that the regeneration wastewater amount is reduced by about 50%. The characteristics of high pH value, high water temperature, water stabilizer and the like of circulating water in the cooling tower 6 are fully utilized to dilute, neutralize and scale-inhibit high-salinity wastewater generated in the regeneration and replacement stages of the weak acid cation bed 1, so that scaling of calcium sulfate in the wastewater collection tank 3, the conveying pipeline and the desulfurization reuse water tank 8 can be effectively avoided, the amount of alkali used for neutralization is reduced, and the problem of recycling of weak acid regeneration wastewater is well solved.
Example 2.
A raw water pretreatment system of a certain thermal power plant in Shaanxi adopts a weak acid positive bed softening treatment process, and the daily average treatment capacity is about 20000m3Generating about 1600m of regeneration waste water3. The weak acid cation bed regeneration sequence is as follows: back washing (30 min, 120 m)3Per) → acid regeneration (90 min, 100 m)3Perh) → Displacement (30 min, 100 m)3H) → Positive Wash (60 min, 180 m)3H). The weak acid cation bed generates about 440 m of wastewater once3The content of sulfate ions in the regeneration wastewater is about 3400mg/L, and the content of calcium ions is about 2000 mg/L.
After the technology is modified, water is discharged in the back washing stage and the front washing stage (about 240 m)3) Is recycled to the cooling tower through a recycling water pump to be used as water replenishing, water discharging in the regeneration and replacement stage (about 200 m)3) Circulating water (about 350 m) with cooling tower3) And after fully mixing, recycling the mixture to a desulfurization multiplexing water tank through a multiplexing water pump to be used as process water supplement of a limestone-gypsum wet desulfurization system. Thereby reducing the amount of high-salinity wastewater by about 54 percent and reducing the annual reduction by about 30 ten thousand meters3The water-saving effect is obvious. The problem of calcium sulfate scaling in a weak acid regeneration wastewater discharge system is well solved, the annual discharge system cleaning and chemical cleaning cost is saved by about 70 ten thousand yuan, and the economic benefit is obvious.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (8)
1. A system for recycling regenerated wastewater of a weak acid cation bed of a thermal power plant by different qualities is characterized by comprising a weak acid cation bed (1), a drainage ditch (2), a wastewater collecting pool (3), a cooling tower (6) and a desulfurization reuse water pool (8); the regeneration outlet and escape canal (2) intercommunication of weak acid cation bed (1), escape canal (2) and wastewater collection pond (3) intercommunication, wastewater collection pond (3) are connected with and add alkali device (4), wastewater collection pond (3) are through the water inlet intercommunication of recovery water pipe (10) and cooling tower (6), install recovered water pump (5) on recovered water pipe (10), wastewater collection pond (3) are still through the water inlet intercommunication of multiplexing water pipe (12) and desulfurization multiplexing pond (8), install multiplexing water pump (7) on multiplexing water pipe (12), the outlet of cooling tower (6) passes through circulating water drain pipe (11) and wastewater collection pond (3) intercommunication, install circulating water drain pump (9) on circulating water drain pipe (11).
2. The system for recycling weak acid cation bed regeneration wastewater of a thermal power plant according to claim 1, wherein the recovery water pump (5) and the reuse water pump (7) are arranged in parallel.
3. The system for recycling weak acid cation bed regeneration wastewater of a thermal power plant according to claim 1, wherein a valve is installed on the recovery water pipe (10), a recirculation branch is led out from the recovery water pipe (10), the recirculation branch is communicated to the wastewater collection tank (3), and a valve is installed on the recirculation branch.
4. The system for recycling weak acid cation bed regeneration wastewater of a thermal power plant according to claim 1, wherein a valve is installed on the reuse water pipe (12), a recirculation branch is led out from the reuse water pipe (12), the recirculation branch is communicated to the wastewater collection tank (3), and a valve is installed on the recirculation branch.
5. The system for recycling weak acid cation bed regeneration wastewater of a thermal power plant according to claim 1, wherein a valve is installed on the circulating water drainage pipe (11).
6. A working method of the weak acid cation bed regeneration wastewater quality-divided recycling system of the thermal power plant according to any one of claims 1 to 5, characterized in that the regeneration process of the weak acid cation bed (1) is as follows: the process comprises the following steps of shut-down → backwashing → acid regeneration → replacement → forward washing → delivery, and the quality-based recycling process is as follows:
a) backwashing is firstly carried out after the weak acid cation bed (1) is shut down, backwashing drainage enters a wastewater collection tank (3) through a drainage ditch (2), and after backwashing is finished, a recovery water pump (5) is started to recover the backwashing drainage to a cooling tower (6) until the wastewater collection tank (3) reaches the lowest liquid level;
b) acid is fed into a weak acid cation bed (1) for regeneration and replacement, regenerated wastewater enters a wastewater collection pool (3) through a drainage ditch (2), a circulating water drainage pump (9) is started at the same time, circulating water in a cooling tower (6) is sent to the wastewater collection pool (3) to be fully mixed with the regenerated wastewater, the circulating water drainage pump (9) is stopped after replacement is finished, then an alkali adding device (4) is put into operation to adjust the pH value, a reuse water pump (7) is started after the pH value is qualified, and the mixed wastewater is sent to a desulfurization reuse water pool (8) to be used as process water replenishing water of a limestone-gypsum wet desulfurization system until the wastewater collection pool (3) reaches the lowest liquid level;
c) the weak acid cation bed (1) is washed before being put into operation, the water drained by the washing enters the wastewater collection pool (3) through the drainage ditch (2), and after the washing is finished, the recovery water pump (5) is started to recover the water drained by the washing to the cooling tower (6) until the wastewater collection pool (3) reaches the lowest liquid level.
7. The working method of the system for recycling the regenerated wastewater of the weak acid cation bed of the thermal power plant according to the claim 6, characterized in that the characteristics of the regeneration step sequence of the weak acid cation bed (1) are fully utilized, and the backwashing and the forward washing drainage water with better water quality are recycled to the cooling tower (6) to be used as the water supplement, so that the amount of the regenerated wastewater is reduced.
8. The working method of the system for recycling weak acid cation bed regeneration wastewater according to claim 6, characterized in that the characteristics of high pH value, high water temperature and containing water stabilizer of circulating water in the cooling tower (6) are fully utilized to dilute, neutralize and inhibit scale of high-salinity wastewater generated in the regeneration and replacement stages of the weak acid cation bed (1), thereby preventing scale from being separated out of calcium sulfate in the wastewater collection tank (3), the conveying pipeline and the desulfurization reuse water tank (8), reducing the amount of neutralizing alkali and solving the problem of recycling weak acid regeneration wastewater.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111747561A (en) * | 2020-06-10 | 2020-10-09 | 华电电力科学研究院有限公司 | Automatic control system for water quality of high-level water collecting cooling tower of thermal power plant |
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