JP6813623B2 - Water treatment system for boiler water supply - Google Patents

Description

The present invention relates to a water treatment device for boiler water supply in a power plant or the like.

In a power plant such as thermal power generation, a boiler for driving a turbine is provided. A water treatment system for water supply is installed in the water supply pipe of the boiler.

For example, ammonia gas is injected into the water supply. As a result, the pH of the water supply is adjusted, and corrosion of the water supply pipe is suppressed. Further, in addition to ammonia gas, oxygen gas is injected into the water supply. As a result, a protective film (oxide film) is formed on the inner wall of the water supply pipe, which also suppresses corrosion of the water supply pipe.

For example, in Patent Document 1, a bypass pipe for diversion of water supply from the water supply pipe is provided. Further, an ejector is provided in this bypass pipe. Further, the oxygen supply pipe and the ammonia supply pipe are merged, and the merged pipe is connected to the suction port of the ejector. That is, a mixed gas of oxygen gas and ammonia gas is sucked from the suction port of the ejector and injected into the water supply.

Japanese Patent No. 3268716

By the way, when a mixed gas of oxygen gas and ammonia gas is sent to a single ejector, it may be difficult to control the dissolved oxygen concentration and pH in the feed water. For example, when the supply amount of oxygen gas is reduced in the mixed gas, if the negative pressure (that is, suction pressure) of the ejector is constant, the supply amount of ammonia gas may increase and the pH of the feed water may rise. As described above, the pH of the supplied water fluctuates according to the adjustment of the dissolved oxygen concentration, and the adjustment of the dissolved oxygen concentration and the pH adjustment may affect each other, making it difficult to manage each of them.

Therefore, it is conceivable to inject ammonia gas and oxygen gas into the water supply with separate ejectors. However, when ammonia gas is injected alone, a so-called pH shock occurs in which the pH of the feed water rapidly increases, and dissolved iron in the feed water tends to precipitate.

Therefore, it is conceivable to inject oxygen gas upstream from the injection point of ammonia gas to lower the pH of the water supply to some extent to alleviate the rapid increase in pH due to the injection of ammonia gas downstream. However, the water supply in the gas-liquid mixed state in which oxygen gas is injected may cause cavitation in the ejector for ammonia gas, which may lead to damage to the ejector.

Therefore, an object of the present invention is to provide a boiler water supply water treatment system capable of easily adjusting the dissolved oxygen concentration and pH in the feed water and suppressing the inflow of the gas-liquid mixed flow into the ejector. To do.

The present invention relates to a water treatment system for boiler water supply. The system includes a bypass pipe that divides the water supply from the water supply pipe, an ammonia gas pipe that injects ammonia gas into the water supply divided into the bypass pipe, and an oxygen gas pipe that injects oxygen gas into the water supply divided into the bypass pipe. To be equipped. A part of the bypass pipe is branched into a first branch pipe and a second branch pipe. An oxygen ejector is provided in the first branch pipe, and an oxygen gas pipe is connected to the suction pipe of the oxygen ejector. An ammonia ejector is provided in the second branch pipe, and an ammonia gas pipe is connected to the suction pipe of the ammonia ejector. Further, the ejector for ammonia is provided near the confluence of the second branch pipe with the first branch pipe.

According to the above configuration, a branch pipe for injecting oxygen gas and a branch pipe for injecting ammonia gas are provided respectively, and an ejector is provided in each branch pipe. Therefore, the oxygen injection amount and the ammonia injection amount can be managed independently. Further, by providing the ejectors in parallel, the inflow of the gas-liquid mixed flow into the ejector, such as the ejector on the downstream side when installed in series, is suppressed. In addition, by providing an ejector for ammonia near the confluence point, the water supply in which ammonia gas is injected merges with the water supply in which oxygen is injected promptly, so that precipitation of dissolved substances due to a rapid increase in pH can be suppressed. It becomes.

Further, in the above invention, the first branch pipe may be provided with the first control valve, and the second branch pipe may be provided with the second control valve.

Further, in the above invention, a merging joint may be provided at the merging point between the first branch pipe and the second branch pipe. In this case, the reducer is connected to the connecting pipe on the second branch pipe side of the merging joint. In addition, an ammonia ejector is connected to the reducer.

According to the above configuration, the ejector for ammonia is connected to the merging joint via the reducer, and the distance from the injection point of the ammonia gas to the merging point with the water supply into which the oxygen gas is injected can be shortened.

Further, in the above invention, the discharge port of the ammonia ejector may be formed so that the inner diameter is smaller than that of the bypass pipe downstream from the confluence of the first branch pipe and the second branch pipe. Further, a merging joint may be provided at the merging point between the first branch pipe and the second branch pipe. In this case, the merging joint has the same inner diameter as the discharge port of the ammonia ejector, the connecting pipe to which the discharge port is connected, and the bypass pipe downstream from the merging point of the first branch pipe and the second branch pipe. It may be a different diameter joint provided with a connecting pipe.

According to the above configuration, since the ejector for ammonia is directly connected to the merging joint, the distance from the injection point of the ammonia gas to the merging point with the water supply into which the oxygen gas is injected can be shortened.

Further, in the above invention, a water supply confluence point at which the bypass pipe merges with the water supply pipe may be provided downstream from the confluence point between the first branch pipe and the second branch pipe. In this case, the distance from the connection between the oxygen gas pipe and the oxygen ejector to the water supply confluence is longer than the distance from the connection between the ammonia gas pipe and the ammonia ejector to the water supply confluence. Good.

In general, oxygen gas has a lower solubility in water than ammonia gas. Therefore, by making the distance from the connection between the oxygen gas pipe and the oxygen ejector to the water supply confluence longer than the distance from the connection between the ammonia gas pipe and the ammonia ejector to the water supply confluence, the oxygen gas Dissolution into water supply is promoted.

Further, in the above invention, the oxygen gas pipe may be provided with a control valve for controlling the amount of oxygen gas injected into the first branch pipe. Further, the ammonia gas pipe may be provided with a control valve for controlling the amount of ammonia gas injected into the second branch pipe.

According to the present invention, it is possible to easily adjust the dissolved oxygen concentration and pH in the feed water as compared with the conventional case, and to suppress the inflow of the gas-liquid mixed flow into the ejector.

It is a perspective view which illustrates the water treatment system for boiler water supply which concerns on this embodiment. It is a side sectional view of an ejector. It is a figure which illustrates the connection structure of the ejector for ammonia and the ejector for oxygen. It is a figure which shows another example of the connection structure of the ejector for ammonia and the ejector for oxygen.

FIG. 1 illustrates a piping diagram of a boiler water supply system including a water treatment system for boiler water supply according to the present embodiment. The water treatment system includes a bypass pipe 30, an oxygen gas pipe 60, an ammonia gas pipe 70, various devices such as an oxygen ejector 46 and an ammonia ejector 56 provided in these pipes, and a control unit 80. Consists of. Such a water treatment system is connected to the water supply main pipe 10 (water supply pipe).

The water supply mother pipe 10 includes a condenser 16, a diversion joint 12, a confluence joint 14, an oxygen sensor 22, a pH sensor 24, and an electric conductivity sensor 25 from upstream to downstream. Further, the water supply mother pipe 10 includes a main pump and a deaerator (not shown).

The condenser 16 cools the steam that rotationally drives the turbine and returns it to water (that is, the liquid phase). In the diversion joint 12, a part of the water supply flowing through the water supply main pipe 10 (water supply pipe) is diverted to the water treatment system according to the present embodiment. Specifically, the diversion joint 12 is, for example, a T-shaped pipe, and one connecting pipe thereof is connected to the upstream end of the bypass pipe 30.

In the merging joint 14, the water supply in which ammonia and oxygen have been injected through the bypass pipe 30 is returned to the water supply mother pipe 10. Specifically, the merging joint 14 is, for example, a T-shaped pipe, and one connecting pipe thereof is connected to the downstream end of the bypass pipe 30. Further, the merging joint 14 is provided with a water supply merging point 14A which is downstream from the merging point of the first branch pipe 40 and the second branch pipe 50 and where the bypass pipe 30 joins the water supply main pipe 10 (water supply pipe). Be done.

If the inner diameters of the water supply mother pipe 10 and the bypass pipe 30 are different, for example, if the inner diameter of the bypass pipe 30 is smaller than that of the water supply mother pipe 10, a reducer (not shown) is used to compensate for the difference in inner diameter between the two. May be provided. That is, the connection portion between the water supply mother pipe 10 and the bypass pipe 30, specifically, the connection portion between the upstream end of the bypass pipe 30 and the diversion joint 12, and the connection portion between the downstream end of the bypass pipe 30 and the merging joint 14. May be provided with a reducer (not shown).

The flow rate of the supply water flowing through the water supply main pipe 10 is adjusted by a main pump (not shown). Further, a gas (mainly excess oxygen gas) in the water supply is removed by a deaerator (not shown). The dissolved oxygen concentration of the supply water that has passed through the deaerator is measured by the oxygen sensor 22. Further, the electric conductivity is measured by the electric conductivity sensor 25 as a parameter indicating the water quality of the water supply, in other words, the concentration of the drug injected into the water supply. Further, the pH of the supplied water is measured by the pH sensor 24. The dissolved oxygen concentration measured by the oxygen sensor 22 is transmitted to the control unit 80. Similarly, the electric conductivity of the water supply measured by the electric conductivity sensor 25 is transmitted to the control unit 80. Further, the pH of the supplied water measured by the pH sensor 24 is transmitted to the control unit 80.

The control unit 80 is composed of, for example, a computer. The control unit 80 includes a CPU having an arithmetic circuit, a storage unit including RAM and ROM, and functional members such as an input / output interface. As described above, in the control unit 80, the dissolved oxygen concentration of the water supply is transmitted from the oxygen sensor 22, the electric conductivity of the water supply is transmitted from the pH sensor 24, and the electric conductivity of the water supply is transmitted from the electric conductivity sensor 25. ..

Further, the flow meter 66 provided in the oxygen gas pipe 60 transmits the flow rate of the oxygen gas flowing through the pipe to the control unit 80. Further, the flow meter 76 provided in the ammonia gas pipe 70 transmits the flow rate of the ammonia gas flowing through the pipe to the control unit 80.

In response to these measured values, the control unit 80 controls a main pump, a bypass pipe pump 32, and control valves 68 and 78 (not shown). Further, the opening degrees of the first control valve 44 and the second control valve 54 may also be controlled targets.

For example, when the dissolved oxygen concentration in the water supply is lower than the set value by the oxygen sensor 22, a command to increase the opening degree of the control valve 68 of the oxygen gas pipe 60 is transmitted to the control valve 68.

Further, for example, in controlling the flow rate of ammonia gas, the electric conductivity sensor 25 is used as a sensor for adjusting the injection amount. For example, the measured value of the pH sensor 24 is a logarithm (Log), and the measured value changes exponentially with a change in the flow rate (injection amount) of ammonia gas. On the other hand, in the electric conductivity sensor 25, the measured value changes linearly with the change in the flow rate (injection amount) of the ammonia gas. Comparing the difference in the change of the measured value, the electric conductivity sensor 25 is more suitable as a sensor for adjusting the injection amount than the pH sensor 24.

Therefore, for example, JIS B8223 Annex AA. As defined in 4.4.1, the injection concentration of ammonia gas is measured by the electric conductivity sensor 25, and the pH value corresponding to this concentration is used as a control item. That is, the electric conductivity sensor 25 is used for adjusting the injection amount of ammonia gas, and the pH sensor 24 is used for monitoring the adjustment result.

For example, when the electric conductivity of the water supply is lower than the set value by the electric conductivity sensor 25, a command to increase (widen) the opening degree of the control valve 78 of the ammonia gas pipe 70 is given to the control valve 78. Send.

With reference to FIG. 1, as described above, the upstream end of the bypass pipe 30 is connected to the diversion joint 12 of the water supply master pipe 10, and the downstream end thereof is connected to the confluence joint 14. The bypass pipe pump 32 is composed of, for example, a centrifugal pump, and a part of the water supply flowing through the water supply mother pipe 10 (water supply pipe) is divided (that is, drawn in) into the bypass pipe 30.

A part of the bypass pipe 30 is branched into the first branch pipe 40 and the second branch pipe 50. For example, the intermediate portion of the bypass pipe 30 is branched into the first branch pipe 40 and the second branch pipe 50. As will be described later, oxygen gas is injected into the first branch pipe 40, and ammonia gas is injected into the second branch pipe 50.

The first branch pipe 40 and the second branch pipe 50 are configured to have an inner diameter smaller than that of the bypass pipe 30. For example, under the condition that the sum of the inner diameter R1 of the first branch pipe 40 and the inner diameter R2 of the second branch pipe 50 is equal to the inner diameter R0 of the bypass pipe 30 (R1 + R2 = R0), the inner diameter R1 is larger than the inner diameter R2. The first branch pipe 40 and the second branch pipe 50 are configured so as to be (R1> R2).

A diversion joint 34 is provided at the upstream end of the first branch pipe 40 and the second branch pipe 50, that is, a diversion point, and a confluence joint 36 is provided at the downstream end, that is, the confluence point. The diversion joint 34 and the merging joint 36 are both composed of, for example, a T-shaped pipe.

As illustrated in FIG. 3, the merging joint 36 includes three connecting pipes 36A, 36B, 36C. An oxygen ejector 46 is connected to the connecting pipe 36B on the first branch pipe 40 side via the pipe 49 and the reducer 48. An ammonia ejector 56 is connected to the connecting pipe 36A on the second branch pipe 50 side via the reducer 58. A bypass pipe 30 is connected to the connecting pipe 36C.

Further, with reference to FIG. 1, reducers 42 and 52 are provided at the connection portion between the first branch pipe 40 and the second branch pipe 50 and the diversion joint 34. The diameter of the upstream end opening of the reducers 42 and 52 is equal to the inner diameter of the diversion joint 34, and the diameter of the downstream end opening is equal to the inner diameter of the first branch pipe 40 and the second branch pipe 50. The reducers 42 and 52 are configured so that the inner diameter gradually decreases from the upstream end opening to the downstream end opening.

With reference to FIG. 3, reducers 48 and 58 are provided at the connection portion between the first branch pipe 40 and the second branch pipe 50 and the merging joint 36. The diameter of the upstream end opening of the reducer 48 is equal to the diameter of the outlet of the oxygen ejector 46, that is, the downstream end opening of the diffuser 46C. The diameter of the downstream end opening of the reducer 48 is equal to the inner diameter of the pipe 49. Similarly, the diameter of the upstream end opening of the reducer 58 is equal to the diameter of the discharge port of the ammonia ejector 56, that is, the downstream end opening of the diffuser 56C. The diameter of the downstream end opening of the reducer 58 is equal to the inner diameter of the connecting pipe 36A of the merging joint 36. The reducers 48 and 58 are configured so that the inner diameter of the pipe gradually increases from the upstream end opening to the downstream end opening.

Returning to FIG. 1, a control valve 44 (first control valve) for flow rate adjustment is provided downstream of the reducer 42, and similarly, a control valve 54 (second control valve) for flow rate adjustment is provided downstream of the reducer 52. Is provided. The opening degree of the control valves 44 and 54 may be set manually, or the opening degree may be adjusted by the control unit 80. For example, the opening degree of the control valve 44 is controlled according to the target injection gas amount of oxygen gas. Similarly, the opening degree of the control valve 54 is controlled according to the target injection gas amount of ammonia gas.

The first branch pipe 40 is provided with an oxygen ejector 46 between the first control valve 44 and the reducer 48. Similarly, in the second branch pipe 50, an ammonia ejector 56 is provided between the second control valve 54 and the reducer 58. FIG. 2 illustrates the cross-sectional structure of the ejector 56 for ammonia. The oxygen ejector 46 also has the same structure as in the figure.

The ejector sucks and mixes the relatively low pressure fluid with the relatively high pressure working fluid. The ammonia ejector 56 (similarly to the oxygen ejector 46) includes an introduction pipe 56A, a suction pipe 56B, a diffuser 56C (discharge pipe), and a nozzle 56D.

Water supply, which is a working fluid, is introduced into the introduction pipe 56A. That is, with reference to FIG. 3, the downstream end of the second branch pipe 50 is connected to the introduction pipe 56A. Similarly, the downstream end of the first branch pipe 40 is connected to the introduction pipe 46A of the oxygen ejector 46. The detailed connection structure of the oxygen ejector 46 and the ammonia ejector 56 will be described later.

With reference to FIG. 2, the water supply introduced into the introduction pipe 56A is decompressed and accelerated when passing through the nozzle 56D, and is decelerated and pressurized by the diffuser 56C. That is, the downstream end of the nozzle 56D is a low pressure region, and the fluid is sucked from the suction pipe 56B toward this low pressure region. An ammonia gas pipe 70 is connected to the suction pipe 56B. Similarly, referring to FIG. 3, an oxygen gas pipe 60 is connected to the suction pipe 46B of the oxygen ejector 46.

With reference to FIG. 1, the oxygen gas pipe 60 injects oxygen gas into the first branch pipe 40. In other words, the oxygen gas pipe 60 injects oxygen gas into the water supply which is separated from the bypass pipe 30 and further divided into the first branch pipe 40. The oxygen gas pipe 60 is provided with an oxygen production apparatus 62, a receiver tank 64, a flow meter 66, and a control valve 68 from the upstream side to the downstream side.

The oxygen production apparatus 62 produces a high-concentration oxygen gas by removing nitrogen gas or the like from the air with an adsorbent, for example. For example, an instrumentation air pipe that is a part of a plant pipe is connected to the oxygen production apparatus 62, and oxygen gas is produced from the air (instrumentation air) supplied from the pipe.

The oxygen gas produced by the oxygen production apparatus 62 is sent to the receiver tank 64. Oxygen gas is compressed and accumulated in the receiver tank 64, and oxygen gas is sent out at a constant pressure.

The flow rate of the oxygen gas delivered from the receiver tank 64 is measured by the flow meter 66. The flow rate (injection amount) is controlled by the control valve 68 downstream of the flow meter 66. The control valve 68 may be, for example, an electrically driven valve. The opening degree of the control valve 68 is controlled by the control unit 80 as described above. Further, instead of the flow meter 66 and the control valve 68, a flow rate control device in which these devices are integrated may be provided.

The ammonia gas pipe 70 injects ammonia gas into the second branch pipe 50. In other words, the ammonia gas pipe 70 injects ammonia gas into the water supply which is separated from the bypass pipe 30 and further divided into the second branch pipe 50. The ammonia gas pipe 70 is branched from, for example, an ammonia gas pipe that is a part of a plant pipe.

The flow rate of the ammonia gas flowing through the ammonia gas pipe 70 is measured by the flow meter 76. Further, the flow rate (injection amount) is controlled by the control valve 78 downstream of the flow meter 76. The control valve 78 may be, for example, an electrically driven valve. The opening degree of the control valve 78 is controlled by the control unit 80 as described above. Further, instead of the flow meter 76 and the control valve 78, a flow rate control device in which these devices are integrated may be provided.

FIG. 3 illustrates the connection structure of the ejector 56 for ammonia and the ejector 46 for oxygen. The introduction pipe 46A of the oxygen ejector 46 is connected to the downstream end of the first branch pipe 40. Further, the suction pipe 46B is connected to the downstream end of the oxygen gas pipe 60. Further, the diffuser 46C is connected to the upstream end of the reducer 48. The downstream end of the reducer 48 is connected to the upstream end of the pipe 49. Further, the downstream end of the pipe 49 is connected to the connecting pipe 36B of the merging joint 36.

In this way, the oxygen ejector 46 is connected to the merging joint 36 with the pipe 49 interposed therebetween. That is, the oxygen ejector 46 is separated from the merging joint 36 on the upstream side as compared with the ammonia ejector 56. As a result, the distance from the oxygen gas injection point, that is, the connection between the oxygen gas pipe 60 and the oxygen ejector 46 to the water supply confluence 14A (see FIG. 1) is the ammonia gas injection point, that is, the ammonia gas pipe 70. It is configured to be longer than the distance from the connection with the ammonia ejector 56 to the water supply confluence point 14A.

As mentioned above, oxygen is less soluble in water than ammonia. Therefore, by taking the distance from the oxygen gas injection point to the water supply confluence 14A longer than the distance from the ammonia gas injection point to the water supply confluence 14A, the oxygen can be dissolved in the water supply.

Returning to FIG. 3, the introduction pipe 56A of the ammonia ejector 56 is connected to the downstream end of the second branch pipe 50. Specifically, the flange 56A1 provided at the upstream end of the introduction pipe 56A and the flange 50A1 provided at the downstream end of the second branch pipe 50 are connected. Further, the flange 56B1 at the upstream end of the suction pipe 56B and the flange 70B1 at the downstream end of the ammonia gas pipe 70 are connected.

Further, the ammonia ejector 56 is provided near the confluence of the second branch pipe 50 with the first branch pipe 40. For example, as illustrated in FIG. 3, the ammonia ejector 56 is connected to the merging joint 36 via a reducer 58.

Specifically, the flange 56C1 provided at the downstream end of the diffuser 56C of the ammonia ejector 56 is connected to the flange 58C1 provided at the upstream end of the reducer 58. Further, the flange 58A1 at the downstream end of the reducer 58 is connected to the flange 36A1 formed at the upstream end of the connecting pipe 36A on the second branch pipe 50 side of the merging joint 36.

By providing such a structure, the distance from the injection point of the ammonia gas to the confluence point with the water supply into which the oxygen gas is injected is shortened. As described above, there is a risk that substances such as dissolved iron dissolved in the water supply may precipitate with the injection of ammonia gas, and such a section where there is a risk of precipitation is the connection from the diffuser 56C to the merging joint 36. Limited to the section up to pipe 36A.

Further, by installing the ammonia ejector 56 and the oxygen ejector 46 in parallel, it is possible to avoid the occurrence of cavitation that may occur in the ejector on the downstream side, for example, when they are installed in series.

Further, by providing an ejector for each gas to be injected, the flow rate of one gas is less affected by the flow rate of the other gas as compared with the case of injecting a mixed gas, for example, the flow rate is controlled and the dissolved oxygen concentration. And the pH can be easily adjusted.

<Another example of the water treatment system according to this embodiment>
FIG. 4 shows another example of the water treatment system according to the present embodiment. In FIG. 4, the ammonia ejector 56 is connected to the merging joint 36 directly, that is, without the reducer, as compared with FIG. Further, in order to enable such a connection, the merging joint 36 is composed of a different diameter joint. Other configurations are the same as in FIG.

The inner diameter of the connecting pipe 36A on the second branch pipe 50 side of the merging joint 36 is configured to be equal to the diameter of the downstream end opening of the diffuser 56C of the ammonia ejector 56, that is, the discharge port. For example, the diameter of the downstream end opening of the diffuser 56C is smaller than the confluence of the first branch pipe 40 and the second branch pipe 50, that is, the inner diameter of the bypass pipe 30 downstream of the confluence joint 36. Based on this, in the merging joint 36, the inner diameter of the connecting pipe 36A is smaller than the inner diameter of the connecting pipe 36C on the bypass pipe 30 side and the inner diameter of the connecting pipe 36B on the first branch pipe 40 side.

In such a configuration, the diameter of the downstream end opening of the diffuser 56C and the inner diameter of the connecting pipe 36A of the merging joint 36 are equal, and the inner diameter of the bypass pipe 30 and the inner diameter of the connecting pipe 36C of the merging joint 36 are equal. For example, the flange 56C1 provided at the downstream end of the diffuser 56C of the ammonia ejector 56 is connected to the flange 36A1 formed at the upstream end of the connecting pipe 36A on the second branch pipe 50 side of the merging joint 36.

By providing such a structure, the distance from the injection point of the ammonia gas to the confluence point with the water supply into which the oxygen gas is injected is shortened. In particular, as compared with FIG. 3, the distance from the ammonia gas injection point to the confluence with the oxygen gas-injected water supply is shortened by the amount that the reducer 58 is omitted.

10 Water supply main pipe (water supply pipe), 12,34 diversion joint, 14,36 confluence joint, 14A water supply confluence, 16 water concentrator, 22 oxygen sensor, 24 pH sensor, 25 electrical conductivity sensor, 30 bypass pipe, 32 Bypass pipe pump, 36A, 36B, 36C connection pipe, 40 first branch pipe, 42, 48, 52, 58 reducer, 44 first control valve, 46 oxygen ejector, 46A oxygen ejector introduction pipe, 46B oxygen Ejector suction pipe, 46C Oxygen ejector diffuser, 49 pipes, 50 Second branch pipe, 54 Second control valve, 56 Ammonia ejector, 56A Ammonia ejector introduction pipe, 56B Ammonia ejector suction pipe, 56C Diffuser of ejector for ammonia, 60 oxygen gas pipe, 62 oxygen production equipment, 64 receiver tank, 66,76 flow meter, 68,78 control valve, 70 ammonia gas pipe, 80 control unit.

Claims (6)

Bypass pipe that separates water supply from water supply pipe,
An ammonia gas pipe that injects ammonia gas into the water supply that has been diverted to the bypass pipe,
An oxygen gas pipe that injects oxygen gas into the water supply that has been diverted to the bypass pipe,
It is a water treatment system for boiler water supply, which is equipped with
A part of the bypass pipe is branched into a first branch pipe and a second branch pipe.
An oxygen ejector is provided in the first branch pipe, and the oxygen gas pipe is connected to the suction pipe of the oxygen ejector.
An ammonia ejector is provided in the second branch pipe, and the ammonia gas pipe is connected to the suction pipe of the ammonia ejector.
The ammonia ejector is provided in the vicinity of the confluence of the second branch pipe with the first branch pipe.
Water treatment system for boiler water supply. The water treatment system for boiler water supply according to claim 1.
A first control valve is provided in the first branch pipe.
A second control valve is provided in the second branch pipe.
Water treatment system for boiler water supply. The water treatment system for boiler water supply according to claim 1 or 2.
A merging joint is provided at the merging point between the first branch pipe and the second branch pipe.
A reducer is connected to the connecting pipe on the second branch pipe side of the merging joint.
The ejector for ammonia is connected to the reducer.
Water treatment system for boiler water supply. The water treatment system for boiler water supply according to claim 1 or 2.
The discharge port of the ammonia ejector is formed so that the inner diameter is smaller than that of the bypass pipe downstream from the confluence of the first branch pipe and the second branch pipe.
A merging joint is provided at the merging point between the first branch pipe and the second branch pipe.
The merging joint has a connecting pipe having the same inner diameter as the discharge port of the ammonia ejector and to which the discharge port is connected, and the bypass pipe and the inner diameter downstream from the merging point of the first branch pipe and the second branch pipe. Different diameter fittings with equal connection pipes,
Water treatment system for boiler water supply. The water treatment system for boiler water supply according to any one of claims 1 to 4.
A water supply confluence point where the bypass pipe merges with the water supply pipe is provided downstream from the confluence point of the first branch pipe and the second branch pipe.
The distance from the connection portion between the oxygen gas pipe and the oxygen ejector to the water supply confluence is longer than the distance from the connection portion between the ammonia gas pipe and the ammonia ejector to the water supply confluence.
Water treatment system for boiler water supply. The water treatment system for boiler water supply according to any one of claims 1 to 5.
The oxygen gas pipe is provided with a control valve for controlling the amount of oxygen gas injected into the first branch pipe.
The ammonia gas pipe is provided with a control valve for controlling the amount of ammonia gas injected into the second branch pipe.
Water treatment system for boiler water supply.