JPS63161329A - Deaeration method for circulation type hot water feeding facility - Google Patents

Abstract

PURPOSE:To remove corrosive gas such as oxygen or chlorine melted in hot water and prevent components from being corroded by a method wherein a sub-circulation circuit is arranged in a hot water storing tank, hot water is branch to flow in the sub-circulation circuit and the branch hot water is injected and deaerated in an open type deaeration box. CONSTITUTION:Hot water in a hot water storing tank 15 heated by a heater 16 is partially flowed to a main circulation circuit 17 and partially flowed to a sub- circulation circuit 20. The hot water flowed to the sub-circulation circuit 20 is passed through a feeding pipe 23 and injected by an injection nozzle 24 arranged within the open type deaeration box 21 and then corrosive gas such as oxygen or chlorine melted in the hot water is completely removed. The hot water after deaeration is stored once in the open type deaeration box 21, then fed out through a feeding-out pipe 26 under operation of a forced pump 22 and then returned back into the hot water storing tank 15. A repetition of this action causes the hot water stored in the hot water storing tank 15 to be completely removed and at the same time the hot water circulating in the main circulation circuit 17 is also completely removed and the corrosion of pipings and equipment is prevented.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a method of discharging gases such as oxygen and chlorine contained in the vortex to the outside in a circulating hot water system that forcibly circulates hot water. Concerning degassing methods to prevent corrosion.

(Prior Art) As shown in FIG. 2, in a circulating hot water supply system, hot water heated by a heater 2 in a hot water storage tank 1 is forcibly circulated in the direction of the arrow by a pump 3, and is supplied from a hot water tap 5 of a circulation pipe 4. The used amount is replenished from the elevated water tank 6 through the water supply pipe 7.

In such circulating hot water equipment, tidal water often occurs due to corrosion caused by gases such as oxygen and chlorine contained in the whirlpool, and therefore various deaerators are provided to remove corrosive gases.

An example of a conventional degassing device is a bubble separating device shown in FIG. In the figure, 1 is a hot water storage tank, 3 is a pump, 4 is a circulation pipe, 6 is an elevated water tank, and 7 is a water supply pipe. Reference numeral 8 denotes a bubble separator installed in the middle of the circulation pipe 4, which includes a hollow large-diameter portion 8a, an air cushion tube 8b provided on the upper surface of the hollow large-diameter portion 8a, and an upper plate of the cushion tube 8b that can be moved up and down. It consists of an air vent pipe 8C provided in the air vent tube 8C.

This bubble separator 8, when hot water enters the hollow large diameter portion 8a,
The flow rate slows down, and the air bubbles in the vortex are separated and accumulated in the cushion cylinder 8b, and this accumulated gas is released into the atmosphere by raising the vent pipe 8C.

(Utility Model Publication No. 55-91902) As another example of the conventional deaerator, as shown in FIG. There is an air separation device 14 which is provided with an outflow pipe 13 through which the liquid exits approximately tangentially. In this air separation device 14, the air in the liquid that has flowed into the tank 1° is separated while swirling and descending along the inner wall of the tank and accumulates in the upper part of the tank 10. When a certain amount has accumulated, the air is removed from the air vent 11. This is what is released into the atmosphere. (Refer to Utility Model Application Publication No. 59-127708) (Problems to be Solved by the Invention) By the way, the bubble separator 8 shown in FIG. Although large bubbles can be separated, gases such as oxygen and chlorine brought in by the water supply and dissolved in the hot water cannot be degassed because the hollow large diameter portion 8a is sealed and the pressure inside the air cushion cylinder 8b is high. It is something that cannot be done.

Furthermore, when the air separation device 14 shown in FIG. Oxygen and chlorine gases dissolved therein cannot be degassed because the tank 10 is sealed and the pressure inside the tank 10 is high.

For this reason, it is possible to install a full-scale deaerator in the middle of the circulation piping, but for complete deaeration, the deaerator becomes large and requires a large installation space as a circulating hot water supply equipment. Moreover, the cost is extremely high and it is not suitable for practical use.

(Object of the Invention) The present invention was made to solve the above-mentioned problems, and is capable of degassing gases such as oxygen and chlorine in an amount necessary to prevent corrosion of the components of circulating hot water equipment. The purpose of the present invention is to provide a low-cost method of degassing a circulation type hot water supply equipment in the upper space, which can maintain a stable operating state so as not to cause a shortage of hot water in response to load fluctuations in hot water supply usage.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the deaeration method of the circulation type hot water supply equipment of the present invention provides a method for degassing the hot water storage tank by providing a sub-circulation circuit in the hot water storage tank in the circulation type hot water supply equipment. The hot water is diverted to the sub-circulation circuit, and after being sprayed and deaerated in an open deaeration box installed in the middle of the sub-circulation circuit, it is returned to the hot water storage tank by a push pump and circulated through the main circulation circuit. It is characterized by deaerating the required amount for corrosion prevention.

(Function) As mentioned above, hot water diverted from the hot water storage tank to the sub-circulation circuit is sprayed and deaerated in an open deaeration box, so corrosive gases such as oxygen and chlorine dissolved in the hot water are completely removed. It is degassed and released into the atmosphere. The degassed water is returned to the hot water storage tank by a push pump. Since this action is repeated and repeated, the water in the hot water storage tank and the water flowing through the main circulation circuit are gradually deaerated, and even when hot water is used and water is replenished from an elevated water tank, By repeating and continuously performing the above actions, the amount of corrosive gas necessary for corrosion prevention is degassed, and in response to load fluctuations in hot water supply, the hot water storage tank is transferred to a sub-circulation circuit independent of the main circulation circuit. Since the water is diverted and degassed by spraying in the open deaeration box, there is little influence on the main circulation circuit, there is no shortage of hot water, and extremely stable operating conditions can be maintained.

(Embodiment) An embodiment of the deaeration method for a circulating hot water supply equipment according to the present invention will be explained with reference to FIG. , 18 is a hot water tap provided in the middle of the main circulation circuit 1, and 19 is a push pump. Reference numeral 20 denotes a subcirculation circuit provided in the hot water storage tank 15, and the subcirculation circuit 20 includes an open type deaeration box 21 and a push pump 22.
is provided. A spray nozzle 24 is provided at the tip of an introduction pipe 23 piped into the open deaeration box 21, a vent pipe 25 that opens to the atmosphere is provided on the top surface of the open deaeration box 21, and a vent pipe 25 is provided on the lower side surface. A lead-out pipe 26 is provided. A control valve 27 is provided outside the open type deaeration box 21 in the middle of the introduction pipe 23 to adjust the amount of hot water introduced. In addition, 28 is an elevated water tank that replenishes water according to the amount used.
29 is the water supply pipe.

Now, to explain the deaeration method of the present invention in the above-mentioned circulating hot water supply equipment, a portion of the water heated by the heater 16 in the hot water storage tank 15 flows to the main circulation circuit 17, and a portion flows to the subcirculation circuit 2o. Divert. The hot water diverted to this sub-circulation circuit 20 passes through an inlet pipe 23 and is sprayed by a spray nozzle 24 provided in an open deaeration box 21 to remove corrosive gases such as oxygen and chlorine dissolved in the hot water. is completely degassed. After degassing, the thirst is once stored in the open degassing box 21.
It is led out from the outlet pipe 26 by the push pump 22, returned to the hot water storage tank 15, mixed with undegassed water stored in the hot water storage tank 15, and a part of it flows back to the main circulation circuit 17. A part of the water is diverted to the sub-circulation circuit, degassed again in the open type deaeration box 21, and then returned to the hot water storage tank 15 again.

By repeating this action, the hot water stored in the hot water storage tank 15 is completely degassed, and the main circulation circuit 17
The circulating hot water is also completely degassed, preventing corrosion of piping and equipment.

Furthermore, even when hot water is used at the hot water tap 18 and water is supplied from the elevated water tank 28 to the hot water storage tank 15 via the water supply pipe 29, the main circulation circuit 17 is Corrosive gases such as oxygen and chlorine dissolved in the circulating water are removed in the amount necessary for corrosion prevention, so corrosion is reliably prevented.

The amount of hot water flowing into the open type deaeration box 21 is adjusted by adjusting the opening degree of a control valve 27 provided in the introduction pipe 23. It may be branched from the main circulation circuit 17 on the outlet side.

(Effects of the Invention) As can be seen from the above explanation, according to the deaeration method for circulating hot water supply equipment according to the present invention, the amount of corrosive oxygen, chlorine, etc. necessary to prevent corrosion of the components of the circulating hot water supply equipment is achieved. Easily removes sexual gases. Moreover, even when the load changes during hot water use, there is no shortage of hot water, and extremely stable operating conditions can be maintained. Furthermore, there is no need to increase the installation space of the circulating hot water supply equipment, and the cost of the deaeration components is low.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the deaeration method of the circulating hot water supply equipment of the present invention,
Figure 2 is a diagram showing a conventional circulating hot water supply system, Figure 3 is a diagram showing a bubble separator which is an example of a degassing device in a conventional circulating hot water supply system, and Figure 4 is a diagram showing a further conventional degassing system. It is a figure which shows the air separation apparatus which is another example of an apparatus. 15...Hot water storage [16...Heater 17...Main circulation circuit 18...Hot water tap 19...Force pump 20...Subcirculation circuit 21...Open type deaeration box 22...・Force pump 23...Introduction pipe 2
4... Spray nozzle 25... Ventilation pipe 26...
・4 outputs 9 27...Control valve 28...
・Elevated water tank 29... Water supply pipe Applicant: Nippon Benkan Kogyo Co., Ltd. Applicant: Equipment Engineer Link Co., Ltd. Figure 3

Claims (1)

[Claims] In circulating hot water equipment, a sub-circulation circuit is installed in the hot water storage tank, hot water is diverted from the hot water storage tank to the sub-circulation circuit, and the diverted hot water is sprayed and degassed in an open deaeration box installed in the middle of the sub-circulation circuit. A degassing method for a circulation type hot water supply equipment, which is characterized in that the hot water is returned to the hot water storage tank by a push-in pump after being degassed, and the required amount for corrosion prevention of the hot water circulating through the main circulation circuit is degassed.