JP4100435B2 - Deaerated water supply device - Google Patents

Description

  The present invention relates to a degassing water supply device for supplying degassed (deoxygenated, decarboxylated) water to a demand point such as a boiler, and in particular, water is supplied by a nitrogen gas replacement type degassing device. The present invention relates to a deaerated water supply device that performs a deaeration process.

  A conventional deaerated water supply apparatus will be described with reference to FIG.

The water supplied from the water supply pipe 1 to the water supply tank 2 is supplied to the nitrogen gas substitution type deaeration device (N ₂ type deaeration device) 6 through the water supply pipes 3 and 5 in which the pump 4 is interposed. Qi is treated. The nitrogen gas substitution type deaeration device 6 includes a bubbling method, a filler contact method, a self-sufficiency method, etc., all of which have a water tank inside and are configured to retain water for a certain period of time. Yes.

  The deaerated water deaerated by the deaerator 6 is sent out through a water supply pipe 10 in which a pump 17 is interposed.

  The deaerated water from the second water supply pipe 10 is supplied to a demand point such as the boiler 15 through the water supply pipe 12, the water supply pump 13 and the pipe 14.

  In the above-described conventional example, in the deaerated water supply device configured as described above, when the water demand at the demand site increases rapidly, the water tank in the deaeration device 6 is emptied, and the water goes to the demand site. There is a risk that water will not be delivered.

  An object of this invention is to provide the deaeration water supply apparatus by which water is reliably sent to a demand location even if the water demand of a demand location increases rapidly.

The deaerated water supply device according to claim 1 includes a water supply tank to which water is supplied, a nitrogen gas substitution type deaeration device to which water is supplied from the water supply tank via a first water supply pipe, and the deaeration device. A second water supply pipe for sending out degassed water; a third water supply pipe for connecting the second water supply pipe and the water supply tank; and a fourth water supply pipe for connecting the second water supply pipe and the demand point. In the deaeration water supply device , when the water demand at the demand point is a normal amount within the processing capacity of the nitrogen gas replacement deaeration device, a required portion of the deaeration water from the second water supply pipe is It is supplied to the demand point through the fourth water supply pipe, and the remaining portion is returned to the water supply tank through the third water supply pipe .

In the degassed water supply device of claim 1 of this may be provided a gas separation means for separating nitrogen gas from the second water supply pipe or the fourth water supply in the pipe (claim 6). By providing this gas separation means, air biting (air lock) of a water pump provided downstream of the gas separation means is prevented .

In the deaerated water supply device of the present invention, when the amount of water demand at the demand point is a normal amount, the water in the water supply tank is sent to the nitrogen gas replacement deaeration device to be deaerated. The required part of the deaerated water from this nitrogen gas substitution type deaerator is supplied to the demand point, and the remaining part is returned to the water supply tank. By returning the deaerated water thus deaerated to the water supply tank, the water supply in the water supply tank is gradually degassed.

  From this state, when the water demand at the demand point exceeds the processing capacity of the nitrogen gas replacement deaerator, the water in the water supply tank passes through the nitrogen gas replacement deaerator through the third water supply pipe. Without being added to the degassed treated water, the water is sent to the demand point. Since the water in this water supply tank has been degassed to a considerable extent, even if the water in this water supply tank is added to the water from the nitrogen gas replacement degassing device, the deaeration level of the water after the addition Will sufficiently meet the required degassing level of the demand point.

  In addition, by separating the nitrogen gas from the deaerated water sent out from the nitrogen gas substitution type deaeration device by the gas separation means, the air lock phenomenon of the water supply pump disposed downstream of the gas separation means is prevented. The deaerated water is always supplied stably to the demand point.

  According to the present invention, even if the water demand at the deaerated water demand point temporarily exceeds the processing capacity of the nitrogen gas replacement deaerator, the deaerated water can be stably supplied to the demand point to the required level. Can do. Further, by separating the nitrogen gas in the deaerated water before the water supply pump that supplies water to the demand location, air feed of the water supply pump can be prevented and stable operation can be achieved.

  Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 is a system diagram showing a deaerated water supply apparatus according to a reference example .

Water introduced from the water supply pipe 1 to the water tank 2, a pump 4 is the water through the first water supply pipe 3, 5 are interposed nitrogen gas type deaerator (N ₂ Formula degasser) to 6 Degassed. The nitrogen gas substitution type deaeration device 6 may be of any method such as a bubbling method, a filler contact method, or a self-sufficing method, but usually has a water tank inside so as to stay for a certain period of time. It is configured.

  The deaerated water deaerated by the deaerator 6 is sent out through the second water supply pipes 7 and 10 in which the pump 17 and the gas separating means 8 are provided on the way. The gas separation means 8 may be any one of a down-flow type gas-liquid separation device of a tower column type or a tank having a sufficient capacity and having an exhaust means at the top. Reference numeral 9 denotes a pipe for releasing the nitrogen gas separated by the gas separation means 8 into the atmosphere.

  Most of the deaerated water from the second water supply pipe 10 is returned to the first water supply pipe 3 upstream of the pump 4 through the third water supply pipe 11, and the remaining deaerated water is the fourth water supply pipe 12. Then, water is supplied to a demand point such as the boiler 15 through the water supply pump 13 and the pipe 14.

  In addition, it is preferable that the capacity | capacitance of the pumps 4 and 17 is about 1.1 to 1.5 times the capacity | capacitance of the feed water pump 13. FIG.

  In the deaerated water supply device configured as described above, when the water demand at the demand point is a normal amount, only water sufficiently deaerated by the deaeration device 6 passes through the water supply pipes 7, 10, 14. The water is fed to the boiler 15. When the water demand of the boiler 15 exceeds the processing capacity of the deaeration device 6, the water supply in the water supply tank 2 is degassed from the pipe 10 via the third water supply pipe 11 without passing through the deaeration device 6. The water is added to the water and sent to the boiler 15 through the pipes 12 and 14. Thereby, the water tank in the nitrogen gas replacement degassing device 6 is not emptied, and degassed water is continuously fed from the nitrogen gas replacement degassing device 6.

  In addition, even if undeaerated water is added to the water supply of the fourth water supply pipe 12, the amount of non-deaerated treated water added from the water supply tank 2 via the third water supply pipe 11 is equal to or less than a predetermined ratio. As long as it is possible, deaerated water that matches the required deaeration level of the boiler 15 can be sent to the demand point. Even if insufficiently deaerated water exceeding the required deaeration level of the boiler 15 is supplied to the boiler 15, there is no problem as long as it is a short time.

FIG. 2 is a system diagram of the deaerated water supply apparatus according to the embodiment of the present invention .

  In this embodiment, the third water supply pipe 11 branched from the second water supply pipe 10 is connected not to the first water supply pipe 3 but to the water supply tank 2. Other configurations are the same as those in FIG. 1, and the same reference numerals indicate the same parts.

  Also in this embodiment, the water in the water supply tank 2 is supplied to the nitrogen gas substitution type deaeration device 6 through the first water supply pipes 3 and 5 and deaerated, and the deaerated water is supplied to the pump 17 and the second gas. It is sent out through the water supply pipe 7, the gas separation means 8, and the second water supply pipe 10. When the amount of water demand at the demand point (in this case, the boiler 15) is a normal amount, most of the water from the water supply pipe 10 is supplied to the water supply tank 2 through the third water supply pipe 11, and the remaining water is supplied to the boiler 15. The

  By returning the deaerated water thus deaerated to the water supply tank 2, the water supply in the water supply tank 2 is gradually degassed.

  From this state, when the water demand exceeds the processing capacity of the nitrogen gas replacement deaeration device 6, the water in the water supply tank 2 does not pass through the nitrogen gas replacement deaeration device 6 and the third water supply pipe 11. Is added to the degassed treated water from the second water supply pipe 10 and supplied to the boiler 15. For this reason, it is prevented that the water tank of nitrogen gas substitution type deaeration device 6 becomes empty.

  In this embodiment, since the water in the water supply tank 2 has been degassed to a considerable extent, the water in the water supply tank 2 is added to the degassed water from the second water supply pipe 10. Even so, the deaeration level of the water after the addition sufficiently satisfies the required deaeration level of the boiler 15.

In the embodiment above SL Figure 2, since the separate gas from degassed water by the gas separating means 8, is prevented airlock phenomena in the water feed pump 13, water is stable from the water supply pump 13 The water is sent to the demand point such as boiler.

In FIG. 2 , the gas separation means 8 is provided in the second water supply pipe, but instead of this, it may be as shown in FIG.

  In the embodiment of FIG. 3, the degassed water is sent out from the nitrogen gas substitution type deaerator 6 to the second water supply pipe 18 via the pump 17. The second water supply pipe 18 is provided with a high portion 18a, and a gas discharge pipe 19 as a gas dispersion means is connected to the highest position of the high portion 18a, so that the gas separated from water in the second water supply pipe 18 is released to the atmosphere. discharge. The second water supply pipe 18 branches into the third water supply pipe 11 and the fourth water supply pipe 12. Other configurations in FIG. 3 are the same as those in FIG. In addition, the 3rd water supply piping 11 may be connected to the 1st water supply piping 3 as FIG. Also with the deaerated water supply device of FIG. 3, the same effects as those of FIGS. In addition, nitrogen gas in the degassed water is preferable because it is easier to separate than the methods of FIGS.

FIG. 4 shows another embodiment of the present invention, and instead of the gas discharge pipe 19 to the atmosphere installed in the second water supply pipe 18 of FIG. Is branched and provided with a nitrogen gas return pipe 20 for returning the water to the water supply tank 2. According to this embodiment, the separated nitrogen gas and a part of the degassed water are returned into the water supply tank 2, so that the atmosphere in the water supply tank can be made more nitrogen atmosphere, It is possible to more reliably prevent oxygen from being dissolved in the water supply.

FIG. 5 shows still another embodiment of the present invention. Instead of the pipe 19 shown in FIG. 3, the deaerated water is separated into the first water supply pipe 3 via the nitrogen gas return pipe 21 together with the separated nitrogen gas. To send. In this case, since the amount of deaerated water returned by the return pipe 21 is very small compared to the water supplied by the first water supply pipe 3, the pump 4 is not adversely affected.

Although not shown, in FIGS. 2 to 5, nitrogen gas is used so that a part of the deaerated water is returned to the water supply tank 2 before the deaerated water from the deaerator 6 is gas-separated. the return pipe may be branched from the upstream side of the branching portion in Figure 2-5.

  Each of the above embodiments is an example of the present invention, and the present invention can take forms other than those shown in the drawings. For example, it is preferable that a shielding material for breaking the contact between water and air is floated on the water surface in the water supply tank 2 because the deaeration efficiency is further increased.

In the above embodiment, the feed water is fed to the nitrogen gas substitution type deaeration device (N ₂ type deaeration device) 6 by the pump 4, but the feed water tank 2 is arranged at a high place, and due to gravity (water head difference). The water supply may be sent to the deaeration device 6.

  Further, the deaeration device 6 may be arranged at a high place, and the deaeration water may be sent from the deaeration device 6 by a water head difference. In the present invention, the pump 4 and the pump 17 may be driven in conjunction with the pump 13 or may be driven continuously. For the emergency evacuation water supply described above, it is desirable to continuously drive the pump 4 and the pump 17 in order to keep the water supply in the water supply tank as deaerated as possible.

  The present invention can supply deaerated water to various deaerated water demand points other than the boiler.

It is a systematic diagram which shows the deaerated water supply apparatus which concerns on a reference example . It is a systematic diagram which shows the deaerated water supply apparatus which concerns on 1st Embodiment. It is a systematic diagram which shows the deaerated water supply apparatus which concerns on 2nd Embodiment. It is a systematic diagram which shows the deaerated water supply apparatus which concerns on 3rd Embodiment. It is a systematic diagram which shows the deaerated water supply apparatus which concerns on 4th Embodiment. It is a systematic diagram which shows the deaerated water supply apparatus which concerns on a prior art example.

Explanation of symbols

2 Water supply tank 6 N ₂ type deaeration device 8 Gas separation means 15 Boiler

Claims (7)

A water supply tank to which water is supplied;
A nitrogen gas substitution type deaeration device to which water is supplied from the water supply tank via the first water supply pipe;
A second water supply pipe for sending out the deaerated water from the deaerator;
A third water supply pipe connecting the second water supply pipe and the water supply tank;
A fourth water supply pipe connecting the second water supply pipe and the demand point;
A deaerated water supply device comprising :
When the amount of water demand at the demand point is a normal amount within the processing capacity of the nitrogen gas replacement type deaeration device, the required portion of the deaerated water from the second water supply pipe passes through the fourth water supply pipe. The deaerated water supply device is characterized in that the remaining portion is returned to the water supply tank via the third water supply pipe .   The first water pump according to claim 1, wherein the second water supply pipe is provided with a first pump, whereby a part of the water in the second water supply pipe can be returned to the water supply tank via the third water supply pipe. Deaerated water supply device.   In Claim 2, the said 4th water supply piping is provided with the 2nd water supply pump, The capacity | capacitance of the said 1st pump is 1.1 to 1.5 times the capacity | capacitance of this 2nd pump. A deaerated water supply device.   The deaerated water supply device according to any one of claims 1 to 3, wherein water is supplied from the water supply tank to the nitrogen gas replacement deaeration device through the first water supply pipe by gravity.   The deaerated water supply device according to claim 1, wherein a third pump is installed in the first water supply pipe, and water is fed by gravity from the nitrogen gas replacement deaeration device without passing through a pump.   The deaerated water supply device according to any one of claims 2 to 5, further comprising a gas separation means for separating nitrogen gas from the second water supply pipe or the fourth water supply pipe.   7. The deaerated water supply device according to claim 6, wherein the gas separation means is a gas discharge pipe branched from the pipe.

Images