CN110877918A - System and method for treating high-salinity wastewater by using high-temperature ash - Google Patents
System and method for treating high-salinity wastewater by using high-temperature ash Download PDFInfo
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- CN110877918A CN110877918A CN201911303477.6A CN201911303477A CN110877918A CN 110877918 A CN110877918 A CN 110877918A CN 201911303477 A CN201911303477 A CN 201911303477A CN 110877918 A CN110877918 A CN 110877918A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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Abstract
The invention provides a system for treating high-salinity wastewater by using high-temperature ash, which comprises a roller slag cooler, a slag inlet pipe, a slag outlet pipe, a high-salinity wastewater storage tank, a first flow regulating valve, a second flow regulating valve, a cooling water inlet, a cooling water outlet, a slag inlet temperature measuring point, a slag outlet temperature measuring point and a cooling water return water temperature measuring point.
Description
Technical Field
The invention relates to the field of water treatment of thermal power plants, in particular to a system and a method for treating high-salinity wastewater by using high-temperature ash.
Background
In recent years, the government of China has more and more strict regulations on the wastewater discharge of industrial enterprises. The 'Water Ten items' issued in 2015 clearly indicates that 'comprehensive control of pollutant emission' is implemented, and water environment protection is raised to the national strategic level. Relevant regulations of wastewater standard discharge and zero discharge are continuously provided for each province and city, and partial thermal power plants begin to carry out whole-plant wastewater zero discharge transformation.
The waste water produced by the thermal power plant mainly comprises reverse osmosis concentrated water, circulating water sewage, coal-containing waste water, oil-containing waste water, domestic waste water, desulfurization waste water and the like. The reverse osmosis concentrated water, the circulating water sewage and the desulfurization wastewater belong to high-salinity wastewater, and are characterized in that the indexes such as salt content, COD (chemical oxygen demand) and the like are very high, and particularly, the content of soluble salt in the desulfurization wastewater exceeds 35000 mg/L. Therefore, the high-salinity wastewater is the biggest obstacle of the thermal power plant to realize the zero discharge of the wastewater of the whole plant.
At present, two processes are mainly used for zero discharge treatment of high-salinity wastewater: (1) concentration and evaporative crystallization, wherein the concentration generally adopts a reverse osmosis membrane (or DTRO membrane) or a high-temperature flue gas concentration process, the high-salinity wastewater is concentrated into a small amount of high-concentration wastewater, and then evaporation equipment is used for evaporating the concentrated water to dryness. Commonly used evaporation equipment includes multi-effect evaporative crystallization (MED), vapor mechanical compressive crystallization (MVR), and natural evaporative crystallization (NED). (2) Concentration and flue evaporation, wherein the concentration process is the same as the first method, and the flue evaporation process is divided into flue direct evaporation and flue bypass evaporation. The direct flue evaporation is to directly spray concentrated water into a high-temperature flue, wherein the spraying point is generally at the horizontal flue at the outlet of a hearth, and high-temperature flue gas is used for quickly evaporating wastewater; the flue bypass evaporation is to take flue gas (about 300 ℃) before the air preheater, and introduce the flue gas into an evaporation tower to evaporate waste water to dryness. The two processes are applied in domestic engineering, the evaporative crystallization process has no influence on the operation of a boiler, but the investment and the operation and maintenance cost are high; the flue evaporation process may slightly reduce boiler efficiency and may also have an impact on boiler operation, with the advantage of lower investment and operating costs.
The roller slag cooler is an important auxiliary machine of a Circulating Fluidized Bed (CFB) boiler and is used for cooling high-temperature slag blocks discharged from a hearth and conveying the high-temperature slag blocks to a slag bin through a bucket chain machine. The roller slag cooler can be used for treating high-salinity wastewater mainly based on the following steps: (1) the slag inlet temperature in the roller slag cooler is about 900 ℃, and the high-salinity wastewater can be quickly evaporated to dryness; (2) the crystal salt separated out after the high-salt wastewater is evaporated to dryness is discharged along with the bottom slag, so that the pollution risk is avoided; (3) the waste water is evaporated by fully utilizing the waste heat of the bottom slag, and the boiler efficiency and the boiler operation are not influenced.
Disclosure of Invention
The invention aims to provide a system and a method for treating high-salinity wastewater by using high-temperature ash, which solve the defects of high cost and low efficiency of the conventional high-salinity wastewater treatment.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a system for treating high-salinity wastewater by using high-temperature ash, which comprises a roller slag cooler, a slag inlet pipe, a slag outlet pipe, a high-salinity wastewater storage tank, a first flow regulating door, a second flow regulating door, a cooling water inlet, a cooling water outlet, a slag inlet temperature measuring point, a slag outlet temperature measuring point and a cooling water return temperature measuring point, wherein the cooling water inlet and the cooling water outlet arranged on the roller slag cooler are respectively connected with a wastewater outlet and a wastewater inlet on the high-salinity wastewater storage tank to form a cooling water circulation loop; a feed inlet arranged on the roller slag cooler is connected with a slag inlet pipe; a slag discharging hole arranged on the roller slag cooler is connected with a slag discharging pipe; a slag inlet temperature measuring point, a slag outlet temperature measuring point and a cooling water return temperature measuring point are respectively arranged on the slag inlet pipe, the slag outlet pipe and the cooling water return pipeline; a cooling water outlet on the high-salinity wastewater storage tank is also communicated with the slag inlet pipe; and a first flow regulating valve and a second flow regulating valve are respectively arranged on a connecting pipeline between a cooling water outlet on the high-salinity wastewater storage tank and the slag inlet pipe and between the cooling water outlet and the roller slag cooler.
Preferably, a booster pump is arranged at a cooling water outlet on the high-salinity wastewater storage tank.
Preferably, the roller slag cooler is further provided with a front dust extraction pipe and a rear dust extraction pipe, and the front dust extraction pipe is arranged on one side of the slag inlet; the rear dust extraction pipe is arranged on one side of the slag outlet.
Preferably, the top of the roller slag cooler is also provided with a safety valve.
Preferably, the roller slag cooler is fixed and limited through an equipment support.
A method for treating high-salinity wastewater by using high-temperature ash is based on the system for treating high-salinity wastewater by using high-temperature ash, and comprises the following steps:
under the condition that the roller slag cooler normally operates, the first flow regulating valve and the second flow regulating valve are regulated to proper opening degrees, so that after the system stably operates, a slag tapping temperature measuring point is kept at (110-:
when the temperature at the slag discharging pipe is lower than 110 ℃, reducing the opening degree of the first flow regulating valve until the slag discharging temperature is restored to the normal range;
when the temperature at the slag discharging pipe is higher than 120 ℃, slowly increasing the opening degree of the first flow regulating valve until the slag discharging temperature is restored to the normal range;
when the temperature on the cooling water return pipeline is higher than 95 ℃, the opening degree of the second flow regulating valve is reduced, and meanwhile, the original cooling water quantity is increased until the cooling water return temperature returns to be normal.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a system and a method for treating high-salinity wastewater by using high-temperature ash, which aim at a Circulating Fluidized Bed (CFB) boiler, utilize the existing roller slag cooler as heat exchange equipment and high-temperature bottom slag as a high-temperature heat source, spray the concentrated high-salinity wastewater into the slag cooler, and directly exchange heat with the high-temperature bottom slag to achieve the purpose of quickly evaporating the high-salinity wastewater; the invention fully utilizes the waste heat of the high-temperature bottom slag, treats part of high-salinity wastewater (the treatment capacity is related to the slag discharge capacity) under the condition of not influencing the boiler efficiency and the boiler operation, is beneficial supplement of the traditional zero-discharge process, and has the advantages of good evaporation effect, high equipment utilization rate, low investment and operation maintenance cost and the like;
further, high salt waste water can regard as the recirculated cooling water of cold sediment ware of cylinder, preheats before spouting into cold sediment ware, comes the temperature of control high salt waste water through adjusting cooling water flow, and the advantage of design like this is: (1) the high-salinity wastewater is preheated to about 95 ℃, and can be evaporated more quickly after being sprayed; (2) the cooling water consumption is saved.
Drawings
FIG. 1 is a schematic diagram of a system architecture to which the present invention relates;
the device comprises a roller slag cooler 1, a roller slag cooler 2, an equipment support 3, a slag inlet pipe 4, a slag outlet pipe 5, a high-salinity wastewater storage tank 6, a booster pump 7, a first flow regulating gate 8, a second flow regulating gate 9, a cooling water inlet 10, a cooling water outlet 11, a safety valve 12, a front dust extraction pipe 13, a rear dust extraction pipe 14, a slag inlet temperature measuring point 15, a slag outlet temperature measuring point 16 and a cooling water return temperature measuring point.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, the invention provides a method and a system for treating high-salinity wastewater by using high-temperature ash, which comprises a roller slag cooler 1, an equipment support 2, a slag inlet pipe 3, a slag outlet pipe 4, a high-salinity wastewater storage tank 5, a booster pump 6, a first flow regulating valve 7, a second flow regulating valve 8, a cooling water inlet 9, a cooling water outlet 10, a safety valve 11, a front dust extraction pipe 12, a rear dust extraction pipe 13, a slag inlet temperature measuring point 14, a slag outlet temperature measuring point 15 and a cooling water return temperature measuring point 16, wherein the cooling water inlet 9 and the cooling water outlet 10 arranged on the roller slag cooler 1 are respectively connected with a wastewater outlet and a wastewater inlet on the high-salinity wastewater storage tank 5 to form a cooling water circulation loop.
And a feed inlet arranged on the roller slag cooler 1 is connected with a slag inlet pipe 3.
And a slag discharging hole arranged on the roller slag cooler 1 is connected with a slag discharging pipe 4.
And a slag inlet temperature measuring point 14, a slag outlet temperature measuring point 15 and a cooling water return temperature measuring point 16 are respectively arranged on the slag inlet pipe 3, the slag outlet pipe 4 and the cooling water return pipeline.
And a cooling water outlet on the high-salinity wastewater storage tank 5 is also communicated with the slag inlet pipe 3 and is used for preliminarily cooling ash slag in the slag inlet pipe 3.
And a first flow regulating valve 7 and a second flow regulating valve 8 are respectively arranged on a cooling water outlet on the high-salinity wastewater storage tank 5 and a connecting pipeline between the slag inlet pipe 3 and the roller slag cooler 1.
And a booster pump 6 is arranged at a cooling water outlet on the high-salinity wastewater storage tank 5.
The roller slag cooler 1 is also provided with a safety valve 11, a front dust extraction pipe 12 and a rear dust extraction pipe 13.
The front dust extraction pipe 12 is arranged on one side of the slag inlet; the rear dust extraction pipe 13 is arranged on one side of the slag outlet; the safety valve 11 is arranged on the top of the roller slag cooler 1.
The roller slag cooler 1 is fixed and limited through the equipment support 2.
The working principle of the invention is as follows:
the invention provides a system for treating high-salinity wastewater by using high-temperature ash, which sprays concentrated high-salinity wastewater into a roller slag cooler 1, and quickly evaporates the high-salinity wastewater by using the heat of the high-temperature ash;
the core points of the invention are:
(1) the best evaporation effect is achieved by controlling the amount of waste water sprayed into the slag cooler, and the waste heat of ash slag is fully utilized;
(2) the high-salinity wastewater is used as cooling water of the slag cooler, the preheated wastewater is easier to evaporate, and the effect of saving water is achieved.
The working process of the invention is as follows:
under the condition that the roller slag cooler 1 normally operates, the booster pump 6 is started, and the first flow regulating valve 7 and the second flow regulating valve 8 are regulated to proper opening degrees, so that the slag discharging temperature measuring point 15 is kept in the range of 110-120 ℃ after the system stably operates, and the cooling water return water temperature measuring point 16 is kept at 95 ℃.
The function of the slag tapping temperature measuring point 15 is to monitor the slag tapping temperature, and if the slag tapping temperature is lower than 100 ℃, the waste water in the slag cooler is not completely evaporated.
The function of the cooling water return temperature measuring point 16 is to monitor the temperature of the preheated wastewater, and if the temperature of the wastewater is too high, the wastewater can be gasified in a pipeline, so that danger is caused.
When the slag discharging temperature is lower than 110 ℃, the opening degree of the first flow regulating valve 7 is reduced, and the amount of the injected waste water is reduced until the slag discharging temperature is restored to the normal range.
When the slag discharging temperature is higher than 120 ℃, the opening degree of the first flow regulating valve 7 is slowly increased until the slag discharging temperature is restored to the normal range.
When the return water temperature of the cooling water is higher than 95 ℃, the high-salinity wastewater is fully preheated, at the moment, the opening degree of the second flow regulating valve 8 is reduced, and meanwhile, the original amount of the cooling water is increased until the return water temperature of the cooling water is recovered to be normal.
The safety valve 11 can automatically exhaust gas when the pressure in the slag cooler is too high, so that accidents of the slag cooler are avoided.
Compared with the prior evaporative crystallization technology, the invention has the following advantages:
1. the roller slag cooler is fully used, the high-salt wastewater is evaporated by using the waste heat of the high-temperature bottom slag, the evaporation efficiency is high, and the investment is very low.
2. Inorganic salt crystals precipitated after the evaporation of the wastewater are discharged together with the bottom slag without separate treatment.
The operation efficiency and the operation state of the boiler are not influenced.
Claims (6)
1. A system for treating high-salinity wastewater by using high-temperature ash is characterized by comprising a roller slag cooler (1), a slag inlet pipe (3), a slag outlet pipe (4), a high-salinity wastewater storage tank (5), a first flow regulating valve (7), a second flow regulating valve (8), a cooling water inlet (9), a cooling water outlet (10), a slag inlet temperature measuring point (14), a slag outlet temperature measuring point (15) and a cooling water return temperature measuring point (16), wherein the cooling water inlet (9) and the cooling water outlet (10) arranged on the roller slag cooler (1) are respectively connected with a wastewater outlet and a wastewater inlet on the high-salinity wastewater storage tank (5) to form a cooling water circulation loop; a feed inlet arranged on the roller slag cooler (1) is connected with a slag inlet pipe (3); a slag discharging hole arranged on the roller slag cooler (1) is connected with a slag discharging pipe (4); a slag inlet temperature measuring point (14), a slag outlet temperature measuring point (15) and a cooling water return temperature measuring point (16) are respectively arranged on the slag inlet pipe (3), the slag outlet pipe (4) and the cooling water return pipeline; a cooling water outlet on the high-salinity wastewater storage tank (5) is also communicated with the slag inlet pipe (3); and a first flow regulating valve (7) and a second flow regulating valve (8) are respectively arranged on a cooling water outlet on the high-salinity wastewater storage tank (5) and a connecting pipeline between the slag inlet pipe (3) and the roller slag cooler (1).
2. The system for treating high-salinity wastewater by using high-temperature ash according to claim 1, characterized in that a booster pump (6) is arranged at a cooling water outlet of the high-salinity wastewater storage tank (5).
3. The system for treating high-salinity wastewater with high-temperature ash according to claim 1, characterized in that the roller slag cooler (1) is further provided with a front dust extraction pipe (12) and a rear dust extraction pipe (13), the front dust extraction pipe (12) is arranged at one side of the slag inlet; the rear dust extraction pipe (13) is arranged on one side of the slag outlet.
4. The system for treating high salinity wastewater with high-temperature ash according to claim 1, characterized in that the top of the roller slag cooler (1) is further provided with a safety valve (11).
5. The system for treating high salinity wastewater with high temperature ash according to claim 1, characterized in that, the roller slag cooler (1) is fixed and limited by the equipment support (2).
6. A method for treating high salinity wastewater with high temperature ash, which is characterized in that the system for treating high salinity wastewater with high temperature ash according to any one of claims 1 to 5 comprises the following steps:
under the condition that the roller slag cooler (1) normally operates, the first flow regulating valve (7) and the second flow regulating valve (8) are regulated to proper opening degrees, so that after the system stably operates, a slag discharging temperature measuring point (15) is kept at (110) and 120 ℃, and a cooling water return temperature measuring point (16) is kept at 95 ℃, wherein:
when the temperature at the slag discharging pipe (4) is lower than 110 ℃, reducing the opening degree of the first flow regulating valve (7) until the slag discharging temperature is restored to the normal range;
when the temperature at the slag discharging pipe (4) is higher than 120 ℃, slowly increasing the opening degree of the first flow regulating valve (7) until the slag discharging temperature returns to the normal range;
when the temperature on the cooling water return pipeline is higher than 95 ℃, the opening degree of the second flow regulating valve (8) is reduced, and meanwhile, the original cooling water quantity is increased until the cooling water return temperature returns to be normal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911303477.6A CN110877918A (en) | 2019-12-17 | 2019-12-17 | System and method for treating high-salinity wastewater by using high-temperature ash |
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| CN201911303477.6A CN110877918A (en) | 2019-12-17 | 2019-12-17 | System and method for treating high-salinity wastewater by using high-temperature ash |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114296378A (en) * | 2021-12-31 | 2022-04-08 | 山西世纪中试电力科学技术有限公司 | Algorithm of slag cooler adopting specific heat capacity weighted average slag blocking early warning intelligent system |
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- 2019-12-17 CN CN201911303477.6A patent/CN110877918A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114296378A (en) * | 2021-12-31 | 2022-04-08 | 山西世纪中试电力科学技术有限公司 | Algorithm of slag cooler adopting specific heat capacity weighted average slag blocking early warning intelligent system |
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