JP5973516B2 - Retrofit blow water discharge amount reduction unit, boiler blow water drainage system, and boiler blow water cooling method - Google Patents

Description

  The present invention relates to a post-blow drainage reduction unit retrofitted to an existing boiler blowwater drainage system and a boiler blowwater drainage equipped with the same to reduce the amount of blow drainage discharged from a power generation boiler facility such as a thermal power plant. About the system.

In general, boiler blow water discharged from power generation boiler facilities such as thermal power plants is hot, so the water is mixed to reduce the temperature to a level that does not adversely affect the environment, and then cooled as necessary. After processing to remove heavy metals, it was discharged out of the system.
Usually, thermal power plants, etc. have installed boiler blow water drainage systems that have sufficient treatment capacity in anticipation of the amount of blow drainage that needs to be treated. There was a situation that exceeded the processing capacity of the boiler blow water drainage system due to the inflow of rainwater that was performed or exceeded expectations.
In this case, it is necessary to make some improvements to the boiler blow water drainage system, but it is also necessary to minimize the cost.
The following are known as prior art documents in the technical field related to the present invention.

Patent Document 1 relates to an auxiliary steam system that supplies steam to a plant internal steam load under the name of “auxiliary steam system drain reduction device”, and in particular, reduces the amount of drain discharged to the drain system of an auxiliary boiler. An invention relating to a drain reduction device for an auxiliary steam system is disclosed.
When the invention disclosed in Patent Document 1 is described using the reference numerals described in Patent Document 1 as they are, the auxiliary steam system having the auxiliary boiler 21 is controlled so that the water level of the condensate tank 23 is controlled to be constant. A condensate flow rate adjustment system for continuously supplying water to the feed water drain tank 26; a makeup water flow rate adjustment system for controlling the flow rate of makeup water to be supplied to the feed water drain tank 26 according to the water level of the feed water drain tank 26; A closed cooling water system that cools and circulates the replenishing water supplied to the blow water cooler 35 is provided.
According to the invention disclosed in Patent Document 1 having the above-described configuration, the water level of the condensate tank is controlled to be constant, the condensate is continuously transferred to the feed water drain tank, and the amount of makeup water corresponding to the water level in the feed water drain tank Therefore, it is possible to prevent the water level of the water supply drain tank from rising rapidly and overflowing.
In addition, since the cooling water of the blow water cooler that cools the blow water or the like is circulated in the closed loop cooling water system, the amount of makeup water drained into the pit can be reduced, and the operating cost can be reduced.

Patent Document 2 has a name of “blow tank drain cooling method and system”, and the high temperature drainage from the various drains installed in the boiler building of the thermal power plant is drained from the blow tank to the drain tank. An invention relating to a method and system for cooling and cooling wastewater is disclosed.
The invention disclosed in Patent Document 2 can be explained by using the reference numerals described in Patent Document 2 as they are, and is discharged from a blow tank 1 that collects high-temperature drainage of various drains 2 installed in a boiler building of a thermal power plant. A drainage pipe that goes to the water tank 5 is provided with a temperature reducer 3 that is cooled by the cooling water 4 to reduce the temperature, and is cooled by the cooling device 6 that uses the air flowing into the boiler building. The amount of cooling water in the temperature reducer 3 is controlled by the above.
According to the invention disclosed in Patent Document 2, the temperature is reduced by cooling water from a blow tank that collects high-temperature drainage from various drains installed in a boiler building of a thermal power plant to a drainage pipe that goes to a drainage tank. The temperature is reduced by providing a cooler, and a cooling device that uses the air flowing into the boiler building is provided to cool the air, and the cooling water amount of the cooler is controlled by detecting the drainage temperature after cooling. By having it, since the high temperature wastewater which goes to a drainage tank from a blow tank can be air-cooled with a cooling device using the inflow air to a boiler building, it can cool with the cheap and simple cooling device. In addition, the cooling rate by the cooling water of the desuperheater can be lowered, so that the amount of cooling water can be reduced, and the temperature of the wastewater flowing into the drainage tank after cooling by air cooling is detected to reduce the temperature. By controlling the amount of cooling water in the vessel, the drainage temperature can be accurately and reliably cooled.

Patent Document 3 discloses an invention related to a method for cooling boiler blow water of a power plant having a cooling tower under the name “cooling method of boiler blow water”.
When the invention disclosed in Patent Document 3 is described using the reference numerals described in Patent Document 3 as they are, the blow-down water of the cooling tower 1 passes through the regulating valve 7 and the boiler blow water line 8 from the blow-down line 4. It mixes with the boiler blow water which flows, and it drains, after adjusting the temperature of boiler blow water to the preset temperature below suitable temperature.
According to the invention disclosed in Patent Document 3, the water consumption of the entire plant can be reduced by effectively using the blow-down water of the cooling tower to cool the boiler blow water, and the fresh water is easily disposable. It has the effect that it can be applied to desert areas without water or remote islands without water.

JP-A-5-223207 JP 2009-243727 A JP-A-9-126407

The invention disclosed in the above-mentioned Patent Document 1 is based on the technical idea of circulating and using cooling water for indirectly cooling boiler blow water supplied from an auxiliary boiler. It is not based on the technical idea of cooling and using the boiler blow water itself.
Moreover, since the invention disclosed in Patent Document 1 is mainly intended to adjust the water level of the feed water drain tank 26, it is necessary to provide the invention disclosed in Patent Document 1 individually for each power generation boiler facility. Yes, it was not a technology that unifies boiler blow water discharged from a plurality of power generation boiler facilities and uses it as cooling water.

  The invention disclosed in Patent Document 2 has the technical contents corresponding to the prior art of the present invention, and there is no suggestion or reference to the problems to be solved that the present invention has to solve.

  The invention disclosed in Patent Document 3 lowers boiler blow water by feeding cooled condensate from a circulating water line including a condenser 3 to a boiler blow water line fed from a boiler 10. However, it was not possible to substantially reduce the amount of boiler blow water to be treated.

  The present invention has been made in response to such a conventional situation, and an object of the present invention is to store boiler blow water discharged from at least one power generation boiler facility while cooling it, and newly discharge this stored water. Retrofit blow that can be used as cooling water for boiler blow water, thereby reducing the amount of water used as cooling water in the past, and consequently reducing the amount of blow drainage discharged from the boiler blow water drainage system. An object of the present invention is to provide a wastewater reduction unit and a boiler blowwater drainage system including the same.

In order to achieve the above object, a blow drainage amount reduction unit according to claim 1 is a blow tank for storing boiler blow water discharged from at least one power generation boiler facility, and boiler blow water supplied from the blow tank. A cooling tank for reducing the temperature by mixing the cooling water, a water tank for storing water as cooling water to be supplied to the cooling tank, a blow drain tank for storing blow drainage supplied from the cooling tank, Blow cooling that stores the blow drainage supplied from the blow drain tank, a unit that is retrofitted to the boiler blow water drainage system, and the discharge pipe that discharges the blow drain overflowed from the blow drain tank to the outside of the system. Blow cooling, cooling equipment that extracts and cools the blow drainage stored in this blow cooling water tank, returns it to the blow cooling water tank, and blow cooling It is characterized in that it has a, a feed pipe for feeding a coolant instead of at least a portion of the water directly or indirectly blow draining the cooling bath from the tank.
In the first aspect of the present invention, the blow tank constituting the boiler blow water drainage system has an action of storing boiler blow water discharged from at least one power generation boiler facility. Further, the cooling tank has an effect of storing boiler blow water and irrigation water when the cooling water is mixed with the boiler blow water fed from the blow tank to reduce the temperature. Furthermore, the water tank has an action of storing water that is cooling water. And a blow drain tank has the effect | action of storing the blow drainage supplied from a cooling tank. And a discharge pipe has the effect | action of discharging the blow drainage which overflowed from the blow drain tank out of the system.
Moreover, the blow cooling water tank retrofitted in the invention of claim 1 has an action of storing blow drainage fed (extracted) from the blow drainage tank. Moreover, the cooling equipment attached later has the effect | action of extracting and returning the blow drainage stored in a blow cooling water tank to a blow cooling water tank. Further, the post-feeding supply pipe has an effect of supplying blow drainage as cooling water directly or indirectly from the blow cooling water tank to the cooling tank instead of at least part of the water.
And it is discharged | emitted from the existing at least 1 generator boiler equipment by providing in the existing boiler blow water drainage system the retrofit blow drainage amount reduction unit which consists of a blow cooling water tank, cooling equipment, and supply piping as mentioned above. It has the effect | action of making a boiler blow water cool and making it usable as cooling water. That is, the boiler blow water discharged from at least one power generation boiler facility can be cooled by the boiler blow water discharged before that.

The invention described in claim 2 is the retrofitting blow drainage amount reduction unit described in claim 1, characterized in that the cooling equipment is of an air cooling type.
In addition to the same effect as that of the invention described in claim 1, the invention described in claim 2 has a simple structure and blow drainage (boiler blow water) by adopting an air cooling system. It has the effect | action which makes it low temperature and can be used as cooling water.

The invention according to claim 3 is the retrofitting blow drainage amount reduction unit according to claim 1 or claim 2, wherein the boiler blowwater drainage system includes a heavy metal removal device for removing heavy metals from the blowoff drain in the discharge pipe. In addition, a discharge pipe for connecting the blow cooling water tank and the discharge pipe on the upstream side of the heavy metal removing device is provided.
In addition to the same action as that of the invention described in claim 1 or claim 2, the heavy metal removing device provided in the boiler blow water drainage system is configured from the blow drainage flowing through the discharge pipe. It has the effect of removing heavy metals. In addition, the discharge pipe connects the blow cooling water tank and the discharge pipe upstream of the heavy metal removing device, and supplies the blow drainage to the upstream side of the heavy metal removing device to enable the processing by the heavy metal removing device. Have

The invention according to claim 4 is the retrofitted blow drainage amount reduction unit according to any one of claims 1 to 3, wherein the return pipe for returning the blow drain from the cooling facility to the blow cooling water tank is cooled. It is characterized by having a branch pipe for supplying the blow drainage directly or indirectly to the cooling tank.
In addition to the same operation as that of each of the first to third aspects of the invention, the branch pipe provided in the return pipe can directly or indirectly supply the cooled blow drainage. It has the effect | action of feeding to a cooling tank. Thereby, it has the effect | action of enabling it to supply to the cooling tank the blow drainage in the state cooled by the cooling equipment and the temperature fell most.

According to a fifth aspect of the present invention, there is provided a boiler blow water drainage system comprising: a blow tank that stores boiler blow water discharged from at least one power generation boiler facility; and a boiler blow water fed from the blow tank and cooling water mixed therein. The cooling tank that cools down, the water tank that stores the water that is the cooling water supplied to the cooling tank, the blow drain tank that stores the blow drainage supplied from the cooling tank, and the overflow from the blow drain tank A boiler blow water drainage system comprising a discharge pipe for discharging blow drainage to the outside of the system, a blow cooling water tank for storing blow drainage supplied from the blow drain tank, and a blow drainage stored in the blow cooling tank Cooling equipment that extracts and cools it back to the blow cooling water tank, and blow blow drainage directly or indirectly from the blow cooling water tank to the cooling tank. A feed pipe for feeding a coolant instead of at least a portion of the water, is characterized in that it has a.
Invention of Claim 5 of the said structure is what caught the boiler blow water drainage system provided with the retrofitting blow drainage amount reduction unit of Claim 1 as a boiler blow water drainage system with which these were integrated, and each component The action of the above is the same as that of each component constituting the invention of claim 1.

A sixth aspect of the present invention is the boiler blow water drainage system according to the fifth aspect, wherein the cooling facility is of an air cooling type.
The operation of the above-described configuration according to the sixth aspect of the invention is substantially the same as that of the second aspect of the invention.

Invention of Claim 7 is the boiler blow water drainage system of Claim 5 or Claim 6, Comprising: The boiler blow water drainage system is equipped with the heavy metal removal apparatus which removes heavy metal from blow drainage in a discharge pipe, A discharge pipe for connecting the blow cooling water tank and the discharge pipe on the upstream side of the heavy metal removing device is provided.
The action of the above-described configuration according to the seventh aspect of the invention is substantially the same as the action of the third aspect of the invention.

Invention of Claim 8 is a boiler blow water drainage system of any one of Claim 5 thru | or 7, Comprising: The return piping which returns blow drainage to a blow cooling water tank from cooling equipment is cooled. A branch pipe for supplying blow drainage directly or indirectly to the cooling tank is provided.
The operation of the above-described configuration according to the eighth aspect of the invention is substantially the same as that of the fourth aspect of the invention.

The boiler blow water cooling method according to claim 9 is a boiler blow water cooling step for mixing and cooling boiler blow water discharged from at least one power generation boiler facility with cooling water, and mixing of the boiler blow water and cooling water. A blow drain cooling process for repeatedly extracting and cooling a part of the blow drainage, which is a body, and repeatedly returning the cooled blow drainage. The cooled blow drainage cooled in the blow drain cooling process And injected as cooling water in the boiler blow water cooling step.
The invention described in claim 9 having the above-described configuration is obtained by capturing the invention described in claim 1 as a method invention. The boiler blow water cooling process in the ninth aspect of the invention has an action of cooling the boiler blow water by mixing it with the cooling water, and corresponds to the action by the cooling tank in the invention of the first aspect. The blow drain cooling process has an effect of lowering the blow drainage to such an extent that it can be used as cooling water, and corresponds to the effect of the blow cooling water tank and the cooling facility in the invention of claim 1. Furthermore, the cooled blow drainage cooled in the blow drain cooling process is injected as the cooling water in the boiler blow water cooling process, so that the use of the water as the cooling water is minimized without using the service water as the cooling water. It has the effect | action of cooling boiler blow water, making it the limit. This point corresponds to the action of the cooling tank and the supply pipe in the first aspect of the invention.

According to invention of Claim 1 of this invention, the boiler blow water discharged | emitted newly from the boiler equipment for electric power generation (blow drainage) can be cooled (low-temperature).
As a result, the amount of water used as boiler blow water cooling water can be greatly reduced. Thereby, the quantity of blow drainage discharged | emitted from a boiler blow water drainage system can be reduced significantly.
In this case, as a method for cooling the boiler blow water, an indirect method for cooling the boiler blow water using a cooling facility such as a heat exchanger is adopted by adopting a direct method of mixing the boiler blow water and the cooled blow drainage. Compared to the case of adopting, the piping structure and equipment can be simplified. Thereby, cooling of boiler blow water can be performed efficiently and without incurring cost.
Further, by providing a blow cooling water tank separately from the blow drain tank, it is possible to separate and store the blow drain water in an uncooled state and the cooled blow drain water. Furthermore, by providing the blow cooling water tank, there is also an advantage that the required amount of blow drained water can be pooled.
As a result, by supplying blow drainage stored in the blow cooling water tank to the cooling tank, the boiler blow water can be quickly and efficiently cooled without using water or minimizing the amount of water required. be able to. Thereby, when using the blow waste water discharged | emitted newly from a cooling tank after this as cooling water, the temperature reduction in a cooling tank can also be performed efficiently.
Furthermore, according to the first aspect of the present invention, the equipment necessary for exhibiting the above-described effects is only the blow cooling water tank, the cooling equipment, and the supply pipe, and is extremely simple. Therefore, it has the original effect that the amount of blow drainage discharged from the boiler blow water drainage system can be greatly reduced while minimizing the cost for capital investment.
In addition, according to the first aspect of the present invention, even when it is necessary to lower the temperature of boiler blow water discharged from a plurality of power generation boiler facilities in an integrated manner, it is individually claimed for each power generation boiler facility. It is not necessary to provide the invention described in 1. That is, even when boiler blow water discharged from a plurality of power generation boiler facilities is centrally lowered in temperature, it can be dealt with by providing only one invention according to claim 1 in the boiler blow water drainage system. Therefore, the invention according to claim 1 is a unit facility that is highly expandable and does not require a cost for facility investment.

  According to the second aspect of the present invention, in addition to the same effect as the first aspect of the invention, the cooling system of the cooling facility is made air-cooled so that the blower can be efficiently blown with simple equipment and without cost. Waste water can be cooled. As a result, it has the effect that the cost at the time of installing the retrofitting blow drainage reduction unit of Claim 2 in the existing boiler blow water drainage system can be made still cheaper.

According to invention of Claim 3, heavy metal can be removed from the blow waste water which is going to discharge | emit out of the system. Further, in the inventions according to claims 1 to 3, since the boiler blow water is mainly cooled using blow drainage, the boiler blow water without the post-blowing drainage reduction unit according to claims 1 to 3 is provided. Compared with the case of cooling boiler blow water in a drainage system, dilution of heavy metals in blow drainage with water is unlikely to occur.
As a result, according to the third aspect of the invention, heavy metals can be efficiently removed from blow drainage to be discharged out of the system.

In addition to the same effect as the invention described in each of claims 1 to 3, the invention described in claim 4 is provided with a branch pipe in the return pipe so that the blow drainage cooled in the cooling facility can be used as a cooling tank. It becomes possible to supply.
In this case, the cooling effect of the boiler blow water by blow drainage can be maximized. As a result, it is possible to efficiently lower the temperature of the boiler blow water by the blow drainage while significantly reducing the amount of the blow drainage discharged outside the system.

  Invention of Claim 5 is what caught the thing of the state which installed the retrofitting blow drainage reduction unit of Claim 1 in the existing boiler blow water drainage system as a boiler blow water drainage system, and it is Claim 1 on a structure This is substantially the same as the present invention. Therefore, the effect of the invention of claim 5 is the same as the effect of the invention of claim 1.

  The configuration of the invention described in claim 6 is substantially the same as that of the invention described in claim 2. Therefore, the effect of the invention of claim 6 is substantially the same as the effect of the invention of claim 2.

  The configuration of the invention described in claim 7 is substantially the same as that of the invention described in claim 3. Therefore, the effect of the invention of claim 7 is substantially the same as the effect of the invention of claim 3.

  The configuration of the invention described in claim 8 is substantially the same as that of the invention described in claim 4. Therefore, the effect of the invention according to claim 8 is substantially the same as the effect of the invention according to claim 4.

  The invention described in claim 9 captures the invention described in claim 1 as a method invention, and the effect thereof is the same as that of the invention described in claim 1.

It is a conceptual diagram of the retrofitting blow drainage amount reduction unit which concerns on embodiment of this invention, and a boiler blowwater drainage system provided with the same. It is a flowchart of the boiler blow water cooling method which concerns on embodiment of this invention. It is a conceptual diagram of the retrofitting blow drainage reduction unit which concerns on the modification of this invention, and a boiler blowwater drainage system provided with the same. It is a conceptual diagram of the boiler blow water drainage system which concerns on a prior art.

First, a boiler blow water drainage system according to the prior art, which is an installation target of the retrofitted blow drainage amount reduction unit according to the embodiment of the present invention, will be described in detail with reference to FIG.
FIG. 4 is a conceptual diagram of a boiler blow water drainage system according to the prior art.
As shown in FIG. 4, a boiler blow water drainage system 2 according to the prior art includes a blow tank 4 for storing boiler blow water discharged from a power generation boiler facility 3 of a power plant, and a boiler blow water supplied from the blow tank 4. A cooling tank 5 for mixing and reducing the temperature of the water, a water tank 6 for storing the water that is the cooling water supplied to the cooling tank 5, and a blow drain tank for storing the blow drainage supplied from the cooling tank 5 7 and an overflow pipe 8 for discharging the blow drainage overflowed from the blow drain tank 7 to the outside of the system. The overflow pipe 8 includes discharge pipes 8a to 8d and, if necessary, for treating the blow drainage. A processing device is connected.
More specifically, for example, in the discharge pipes 8a to 8d, the intermediate drain 15 for temporarily storing the blow drain discharged from the overflow pipe 8, the temporary storage tank 16, and the heavy metal in the blow drain are removed. The heavy metal processing device 12 and the discharge pit 17 are provided in series in this order through the discharge pipes 8a to 8d. In particular, by providing the pump 21 in the discharge pipe 8d, the blow drainage can flow from the discharge pit 17 to the outside of the power plant.

Further, in the boiler blow water drainage system 2 according to the prior art, the water tank 6 and the cooling tank 5 are connected by a water supply pipe 24a, and further, a water supply pipe 24b for supplying water to the blow tank 4 from this 24. Is branched. The water supply from the water tank 6 to the blow tank 4 or the cooling tank 5 is performed by a pump 21 provided in the water supply pipe 24a, and each of the water supply pipes 24a and 24b includes water for supplying to the blow tank 4 and the cooling tank 5. Is provided with a valve 20 for controlling the supply of.
Moreover, in the boiler blow water drainage system 2 according to the prior art, the blow drain discharged from the system through the discharge pipes 8a to 8d is used as the water supply pipe so as to compensate for the shortage of the water (cooling water) supplied from the water tank 6. An auxiliary pipe 25 and a pump 21 for returning to 24a are provided.
In addition, in the boiler blow water drainage system 2 according to the related art, a recreation pond 18 is provided in preparation for the case where the amount of cooling water is still insufficient even when the blow drain returned from the auxiliary pipe 25 is used. The water in the basin 18 is configured to be supplied to the cooling tank 5 through the defluorination treatment device 19, the discharge pipes 8 a to 8 d and the auxiliary pipe 25.
When a sufficient amount of water can be supplied from the water tank 6, it is not always necessary to provide the auxiliary pipe 25, the reservoir 18 and the defluorination treatment device 19.

In the boiler blow water drainage system 2 according to the prior art as described above, the boiler blow water discharged from the power generation boiler facility 3 is at a high temperature close to 100 ° C. and cannot be discharged out of the system as it is. The stored boiler blow water is supplied to the cooling tank 5, mixed with the service water as the cooling water and sufficiently cooled down, stored in the blow drain tank 7, and blow blow drain overflowed from the blow drain tank 7. If necessary, heavy metal was removed from the system after the heavy metal was removed by the heavy metal processing apparatus 12.
In such a boiler blow water drainage system 2 according to the prior art, since the cooling water is mixed with boiler blow water in the cooling tank 5 and directly cooled, the amount of blow drainage is extremely large. There was a need to reduce the amount. In addition, the treatment capacity of the boiler blow water drainage system 2 with the expansion of the power generation boiler facility 3, the discharge of boiler blow water by a test run after the inspection of the power generation boiler facility 3, or the inflow of rainwater into the reservoir 18 In some cases, the operation of the power generation boiler facility 3 is hindered.

The retrofitting blow drainage reduction unit 1A according to the present embodiment and a boiler blowwater drainage system 23A including the same will be described in detail with reference to FIG.
FIG. 1 is a conceptual diagram of a retrofitted blow drainage reduction unit and a boiler blow drainage system equipped with the same according to an embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the part same as what was described in FIG. 4, and the description about the structure is abbreviate | omitted.
As shown in FIG. 1, a retrofitting blow drainage amount reduction unit 1 </ b> A according to the present embodiment is a unit facility that is installed afterward with respect to the boiler blowwater drainage system 2 according to the prior art shown in FIG. 4. In FIG. 1, a series of facilities constituting the retrofitting blow drainage reduction unit 1 </ b> A according to the present embodiment is surrounded by a broken line.
As shown in FIG. 1, the retrofitted blow drainage amount reduction unit 1 </ b> A according to this embodiment includes a blow cooling water tank 9 that extracts and stores blow drainage from the blow drain tank 7, and blow drainage that is stored in the blow cooling water tank 9. Is extracted and cooled, and is then constituted by a cooling facility 10 that returns to the blow cooling water tank 9 and a supply pipe 11 that supplies cooled blow drainage from the blow cooling water tank 9 to the water supply pipe 24a.
And the boiler blow water drainage system which concerns on this embodiment is what has installed the retrofitted blow drainage amount reduction | decrease unit 1A which concerns on this embodiment as mentioned above in the boiler blow water drainage system 2 which concerns on the prior art shown in FIG. 23A.

According to the retrofitted blow drainage amount reduction unit 1A (boiler blow water drainage system 23A) according to the present embodiment, the blow drainage cooled in the cooling tank 5 and fed to the blow drain tank 7 is extracted. 9, the entire blow drainage stored in the blow cooling water tank 9 is circulated between the blow cooling water tank 9 and the cooling equipment 10 while being cooled by supplying a part thereof to the cooling equipment 10 while cooling. Further cooling is possible (blow drain cooling process in the latter stage: corresponding to step S02).
Then, the cooled blow waste water is supplied from the blow cooling water tank 9 to the cooling tank 5 through the supply water supply pipe 24a from the supply pipe 11, thereby cooling the boiler blow water supplied to the cooling tank 5 through the blow tank 4. Cooling can be achieved by mixing with the finished blow drainage (boiler blow water cooling step in the subsequent stage: corresponding to step S01).
That is, the boiler blow water discharged later using the boiler blow water discharged from the power generation boiler facility 3 can be cooled.
And if all the cooling water supplied to the cooling tank 5 can be covered with the cooled blow drainage supplied from the blow cooling water tank 9, the boiler blowwater drainage system according to the prior art shown in FIG. In this case, it is not necessary to use the service water supplied to the cooling tank 5 as the cooling water in 2.
That is, it is not necessary to perform blow water treatment corresponding to the amount of water that has been injected for cooling the boiler blow water.
Alternatively, in the boiler blow water drainage system 2 shown in FIG. 4, the boiler blow according to the present embodiment is simply replaced with a cooled blow drain supplied from the blow cooling water tank 9 by replacing a part of the water supplied from the water tank 6. A sufficient reduction effect of the amount of blow drainage discharged from the water drainage system 23A can be expected.

Moreover, the blow waste water processed in the boiler blow water drainage system 2 according to the prior art shown in FIG. 4 is not necessarily discharged from one power generation boiler facility 3. More specifically, in the boiler blow water drainage system 2 according to the prior art shown in FIG. 4, boiler blow water discharged from a plurality of power generation boiler facilities 3 must be processed by adding power generation boiler facilities 3 or the like. Such a situation can also occur.
According to the retrofitted blow drainage reduction unit 1A (boiler blow water drainage system 23A) according to the present embodiment, even in such a case, the boiler blow water can be obtained only by installing one unit facility for the boiler blow water drainage system 2. Even when discharged from one power generation boiler facility 3 or when discharged from a plurality of power generation boiler facilities 3, the boiler blow water drainage system 2 can be dealt with in a unified manner. As a result, the amount of blow drainage discharged from the boiler blow water drainage system 2 can be reliably reduced.
That is, the retrofitted blow drainage amount reduction unit 1A according to the present embodiment is a facility with extremely high expandability.

Further, the retrofitted blow drainage amount reduction unit 1A according to the present embodiment includes a blow cooling water tank 9, piping (including a pump 21) for leading blow drainage from the blow drain tank 7 to the blow cooling water tank 9, a cooling facility 10, It consists of piping (for example, the supply piping 11 and the pump 21) for feeding the cooled blow drainage from the blow cooling water tank 9 to the cooling tank 5, and its configuration is very simple. Therefore, when installing the post-blow drainage reduction unit 1A according to the present embodiment for the boiler blowwater drainage system 2 as shown in FIG. 4, there is no need to change the existing equipment, and the retrofitting blow drainage reduction unit 1A is installed. Since it is only necessary to add it, the cost for the installation can be greatly reduced.
More specifically, when the post-blow drainage reduction unit 1A according to the present embodiment is installed in the boiler blowwater drainage system 2 according to the prior art as shown in FIG. 4, at least three pumps 21 are added. Although necessary, the pump 21 provided in the auxiliary pipe 25 that connects the discharge pit 17 and the water supply pipe 24a can be used as one of them.
Therefore, the capital investment for installing the post-blowing drainage reduction unit 1A according to the present embodiment can be made extremely inexpensive.

In the retrofitted blow drainage reduction unit 1A (boiler blow water drainage system 23A) according to the present embodiment, it is not particularly necessary to specify a cooling method for cooling blow drainage stored in the blow cooling water tank 9, but it is air-cooled. In some cases, there is an advantage that the equipment can be simplified.
In the retrofitted blow drainage reduction unit 1A (boiler blowwater drainage system 23A) according to the present embodiment, blow drainage is supplied from the blow cooling water tank 9 to the cooling facility 10 by the pump 21 and blow cooled from the cooling facility 10 through the return pipe 14. The case of returning to the water tank 9 has been described as an example, but if the air cooling method is not adopted as the cooling method of the cooling facility 10, a pump 21 may be provided in the return pipe 14 as necessary.

  In addition, when blow blow water exceeding the necessary amount is stored in the blow cooling water tank 9 or when blow waste water stored in the blow cooling water tank 9 is no longer necessary, the blow cooling water tank can be quickly discharged out of the system. 9 and a discharge pipe 13 that connects the discharge pipes 8a to 8d may be provided. If the purpose of providing the discharge pipe 13 is only the former, the discharge pipe 13 may be an overflow pipe. However, if the latter purpose needs to be satisfied, a pump 21 is provided in the discharge pipe 13. There is a need.

Moreover, when it is necessary to remove heavy metal from the blow drainage discharged outside the system in the boiler blow water drainage system 2, that is, when the boiler blowwater drainage system 2 includes the heavy metal treatment device 12, the blow cooling water tank 9 and A discharge pipe 13 that connects the discharge pipes 8 a to 8 d may be connected to the upstream side of the heavy metal processing device 12.
According to the retrofitted blow drainage reduction unit 1A (boiler blow water drainage system 23A) according to the present embodiment, since the boiler blow water is mainly cooled by the cooled blow drain in the cooling tank 5, dilution with the boiler blow water water occurs. Hateful. Moreover, when cooling boiler blow water only with cooled blow drainage, the heavy metal in blow drain can be concentrated. As a result, the heavy metal processing apparatus 12 also has an effect that heavy metals can be efficiently removed.

  In the retrofitted blow drainage amount reduction unit 1A (boiler blow water drainage system 23A) according to the present embodiment as shown in FIG. 1, the cooled blow drainage fed from the blow cooling water tank 9 is supplied to the water supply pipe 24a. Although the case where the cooling tank 5 is indirectly supplied is described as an example, the feed pipe 11 and the pump 21 are provided so that the blown drainage cooled from the blow cooling water tank 9 can be directly supplied to the cooling tank 5. It may be arranged.

Next, a boiler blow water cooling method according to the present embodiment will be described with reference to FIG.
FIG. 2 is a flowchart of the boiler blow water cooling method according to the embodiment of the present invention. The same parts as those described in FIGS. 1 and 4 are denoted by the same reference numerals, and description of the configuration is omitted.
The boiler blow water drainage system 2 blow cooling water tank 9 according to the present embodiment captures the retrofitted blow drainage amount reduction unit 1A (boiler blow water drainage system 23A) shown in FIG. 1 as a method invention.
The blow cooling water tank 9 of the boiler blow water drainage system 2 according to the present embodiment is a boiler blow water cooling step for mixing and cooling the boiler blow water 26 discharged from at least one power generation boiler facility 3 with the cooling water 28 (step S01). ), And a blow drain cooling process that repeats repeatedly extracting and cooling a part of the blow drainage 27, which is a mixture of the boiler blow water 26 and the cooling water 28, and The cooled blow drainage 28 cooled in the blow drain cooling process (step S02) is injected as the cooling water 28 in the boiler blow water cooling process (step S01).
In the boiler blow water cooling method 29 shown in FIG. 2, the boiler blow water cooling step in step S01 has a configuration corresponding to the cooling tank 5 in FIG. Moreover, the blow drain cooling process of step S02 is a structure corresponding to the blow cooling water tank 9 and the cooling equipment 10 in previous FIG. Furthermore, in the boiler blow water cooling method 29 according to the present embodiment, the cooled blow drain water 28 cooled in the blow drain cooling process (step S02) is injected as the cooling water 28 in the boiler blow water cooling process (step S01). These are configurations corresponding to the blow cooling water tank 9 and the supply pipe 11.
Therefore, the effect of the boiler blow water cooling method 29 according to the present embodiment as described above is the same as that of the retrofitted blow drainage amount reduction unit 1A (boiler blow water drainage system 23A) according to the present embodiment described above.

Next, with reference to FIG. 3, the retrofitting blow drainage amount reduction unit according to a modification of the present invention will be described in detail.
FIG. 3 is a conceptual diagram of a retrofitting blow drainage reduction unit and a boiler blowwater drainage system including the same according to a modification of the present invention. The same parts as those described in FIGS. 1, 2, and 4 are denoted by the same reference numerals, and description of the configuration is omitted.
The retrofitting blow drainage reduction unit 1B (boiler blowwater drainage system 23B) according to the modification of the present invention was cooled by the cooling facility 10 in the retrofitting blow drainage reduction unit 1A (boiler blowwater drainage system 23A) shown in FIG. A branch pipe 22 is provided in the return pipe 14 so that the blow drain can be supplied to the cooling tank 5 without returning it to the blow cooling water tank 9.

In the retrofitted blow drainage amount reduction unit 1A (boiler blow water drainage system 23A) according to the present embodiment shown in FIG. 1, the blow drainage is taken into the blow cooling water tank 9 from the blow drain tank 7, and then cooled with the blow cooling water tank 9 and cooling. By circulating between the facilities 10, the temperature of the entire blow drainage in the blow cooling water tank 9 is lowered, and after the blow drainage in the blow cooling water tank 9 is sufficiently lowered in temperature, the cooling water 5 is connected to the cooling tank 5 through the supply pipe 11. It is a mechanism to send it.
In this case, the blow drainage stored in the blow cooling water tank 9 becomes higher than the temperature of the blow drainage fed from the cooling facility 10 via the return pipe 14. In this case, while it has the merit that a certain amount of cooled blow drainage can be stored, it is possible to directly send blow drainage that has been chilled to the maximum in the cooling facility 10 directly to the cooling tank 5. Therefore, the cooling effect of boiler blow water by cooled blow drainage could not be maximized.
On the other hand, the retrofitted blow drainage reduction unit 1B (boiler blow water drainage system 23B) according to the modification of the present invention can directly supply the cooled blow drainage cooled in the cooling facility 10 to the cooling tank 5, There is a merit that the cooling effect of the boiler blow water by the finished blow drain can be maximized.
Thereby, there exists a merit that the quantity of blow drainage required in order to reduce the boiler blow water supplied from the blow tank 4 to desired temperature can be reduced.
Therefore, according to the retrofitted blow drainage reduction unit 1B (boiler blowwater drainage system 23B) according to the modification of the present invention, the retrofitting blow drainage reduction unit 1A (boiler blowwater drainage system 23A) according to the present embodiment shown in FIG. ), The amount of blow drainage discharged from the boiler blow water drainage system 2 can be further reduced.
According to the modification shown in FIG. 3, the boiler blow water cooling method described with reference to FIG. 2 is also a modification, and the cooled blow drain water 28 obtained in the blow drain cooling process (step S <b> 02) is blow cooled. The structure used for the boiler blow water cooling process (step S01) as the cooling water 28 without returning to the water tank 9 can be considered. That is, it is possible to use the cooling facility 10 itself instead of the blow cooling water tank 9 as a component surrounded by a dotted line around the cooled blow drainage 28 in FIG.
The effect at that time is the same as that of the above-described modification.

  In addition, as shown in FIG. 3, a valve 20 is provided in each of the supply pipe 11 and the branch pipe 22, and the branch pipe 22 is connected to a pump 21 provided in the supply pipe 11, thereby It is possible to feed the cooled blow drainage from the blow cooling water tank 9 to the cooling tank 5 by the provided pump 21 or to feed the cooled blow drainage directly from the cooling facility 10 to the cooling tank 5.

  As described above, the present invention cools the boiler blow water (blow drainage) discharged from the power generation boiler facility 3 and uses it for cooling the newly discharged boiler blow water, so that the downstream side of the power generation boiler facility is used. The present invention relates to an after-installation blow drainage reduction unit and a boiler blowwater drainage system that can reduce the amount of blow drainage discharged from a boiler blowwater drainage system, and can be used in the technical field related to power generation equipment.

1A, 1B ... Retrofitted blow drainage reduction unit 2 ... Boiler blow water drainage system 3 ... Power generation boiler equipment 4 ... Blow tank 5 ... Cooling tank 6 ... Water tank 7 ... Blow drain tank 8 ... Overflow piping 8a, 8b, 8c, 8d ... Discharge pipe 9 ... Blow cooling water tank 10 ... Cooling equipment 11 ... Supply pipe 12 ... Heavy metal processing equipment 13 ... Discharge pipe 14 ... Return pipe 15 ... Intermediate drain tank 16 ... Temporary storage tank 17 ... Discharge pit 18 ... Reservoir 19 ... Desorption Fluorine treatment apparatus 20 ... Valve 21 ... Pump 22 ... Branch pipe 23A, 23B ... Boiler blow water drainage system 24a, 24b ... Water supply pipe 25 ... Auxiliary pipe 26 ... Boiler blow water 27 ... Blow drain 28 ... Cooling water (cooled blow drain) 29 ... Boiler blow water cooling method

Claims (9)

A blow tank that stores boiler blow water discharged from at least one power generation boiler facility, a cooling tank that mixes cooling water with the boiler blow water supplied from the blow tank and reduces the temperature, and supplies the cooling tank A water tank for storing the water that is the cooling water, a blow drain tank for storing blow drainage supplied from the cooling tank, and a discharge pipe for discharging the blow drain overflowing from the blow drain tank to the outside of the system Is a unit retrofitted to a boiler blow water drainage system comprising:
A blow cooling water tank for storing the blow drainage fed from the blow drainage tank;
A cooling facility for extracting and cooling the blow drainage stored in the blow cooling water tank and returning it to the blow cooling water tank;
A post-discharge drainage amount reduction comprising: a feed pipe that feeds the blow drainage as the cooling water instead of at least a part of the water directly or indirectly from the blow cooling water tank to the cooling tank unit.   The retrofitting blow drainage reduction unit according to claim 1, wherein the cooling facility is an air cooling type. The boiler blow water drainage system includes a heavy metal removing device that removes heavy metals from the blow drainage in the discharge pipe,
The retrofitted blow drainage amount reduction unit according to claim 1 or 2, further comprising a discharge pipe that connects the blow cooling water tank and the discharge pipe on the upstream side of the heavy metal removing device.   The return pipe that returns the blow drainage from the cooling facility to the blow cooling water tank includes a branch pipe that supplies the cooled blow drain directly or indirectly to the cooling tank. The retrofitting blow drainage amount reduction unit according to any one of claims 1 to 3. A blow tank that stores boiler blow water discharged from at least one power generation boiler facility, a cooling tank that mixes cooling water with the boiler blow water supplied from the blow tank and reduces the temperature, and supplies the cooling tank A water tank for storing the water that is the cooling water , a blow drain tank for storing blow drainage supplied from the cooling tank, and a discharge pipe for discharging the blow drain overflowing from the blow drain tank to the outside of the system A boiler blow water drainage system comprising:
A blow cooling water tank for storing the blow drainage fed from the blow drainage tank;
A cooling facility for extracting and cooling the blow drainage stored in the blow cooling water tank and returning it to the blow cooling water tank;
A boiler blow water drainage system comprising: a feed pipe that feeds the blow drainage from the blow cooling water tank directly or indirectly to the cooling tank as the cooling water instead of at least a part of the water. .   6. The boiler blow water drainage system according to claim 5, wherein the cooling facility is an air cooling type. The boiler blow water drainage system includes a heavy metal removing device that removes heavy metals from the blow drainage in the discharge pipe,
The boiler blow water drainage system according to claim 5 or 6, further comprising a discharge pipe that connects the blow cooling water tank and the discharge pipe on the upstream side of the heavy metal removing device.   The return pipe that returns the blow drainage from the cooling facility to the blow cooling water tank includes a branch pipe that supplies the cooled blow drain directly or indirectly to the cooling tank. The boiler blow water drainage system according to any one of claims 5 to 7. A boiler blow water cooling step of cooling boiler blow water discharged from at least one power generation boiler facility with cooling water; and
A blow drainage cooling step that repeatedly stores the blow drainage that is a mixture of the boiler blow water and the cooling water, repeatedly extracts a portion thereof, further cools and returns it, and
The boiler blow water cooling method characterized by inject | pouring the cooled blow waste water cooled in this blow drain cooling process as the said cooling water in the said boiler blow water cooling process.

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