JPS5835303A - Heater for feedwater by waste heat from boiler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feed water heating device capable of heating a plurality of fluids to be heated using boiler exhaust heat.

Most of the steam used in commercial buildings is limited to heating (in winter) and hot water supply, and about 95 cm of used steam is collected as drain. Since the Zeila feedwater temperature will always be maintained at 15 to 95°C, an economizer (feedwater heater) is installed to heat the feedwater using boiler exhaust heat, as shown in Figure 1. However, the boiler feed water easily reaches its boiling point and effective waste heat recovery cannot be expected. Of course, a pressure type economizer may be used for a K that recovers more waste heat than this, but this is not necessarily a desirable device for users because it involves increased legal procedures and maintenance. On the other hand,
Since the hot water supply load varies greatly depending on the time of day, when boiler exhaust heat is used to heat hot water, there is a problem that the storage tank becomes full when the hot water supply load is light, making it impossible to recover waste heat.

In view of this problem, the present invention aims to provide a new device that can efficiently heat a plurality of fluids to be heated with different temperatures, loads, etc. using boiler exhaust heat. .

The details of the invention will now be explained based on the illustrated embodiments.

No. 251J' is a book showing an economizer that is an embodiment of the present invention, and the reference numeral 1 in the figure is a combustion exhaust gas duct 2.
As is clear from the figure with the top lid removed, the boiler feed water is directed from the upstream side to the downstream side of the combustion exhaust gas flow. A number of guide walls 11 for flowing in a zigzag pattern, four guide walls 11 in this embodiment. - are fixed in a direction perpendicular to the flue gas flow so that a wave path is formed between them and the side walls of the container body l on opposite sides. Each flow path 1211800. is divided by these guides 11t l l , , , , . 51. includes a hot water supply heating coil 1 through which make-up water for hot water supply is passed, and a number of heat pipes whose heat receiving parts extend to the combustion exhaust gas duct 2: 51. ,,,,but,
With this layer thickness, they are alternately arranged in every other row from the boiler feed water inlet 12@. Note that the reference numerals q13Fi boiler water supply and discharge ports in the figure, 41 and 42, respectively indicate the inlet and outlet of make-up water for hot water supply.

3rd II #i shows a heating and hot water supply piping system incorporating the above-mentioned economizer. A circulation system path for heating the boiler feed water, and a line path for heating make-up water that is supplied to the storage tank 9 for hot water supply via the coil number in the BFi container main body l, and both of these systems A and B are connected to the boiler 5, via a steam header 6, a storage tank 9 for heating equipment and hot water supply in the building, and a boiler water supply tank 8. In addition, the symbols Pke pump and vFi in the figure
, respectively show electromagnetic valves for opening and closing the hot water heating coil according to the temperature in the hot water storage tank 9. In the above-described embodiment, the main body of the water heating container is connected from the boiler water tank 8 via the pump P. The high temperature boiler water supply flowing into the hot water supply drain 1 first comes into contact with the cold hot water heating coil 4 through which the make-up water for hot water supply flows, and heats the make-up water for hot water supply through heat exchange here.

There is also a creep depending on the amount of boiler feed water flowing into the feed water heating container body 1, the flow rate in the flow path, the flow rate and flow speed of make-up water for hot water supply, the dimensions of the feed water heating container body 1 and the hot water heating coil number, etc. However, according to one experiment, the boiler feed water, which had a temperature of 90°C at the time of inflow, decreased to 81.6'c while passing through this 10th flow path 12f, and on the other hand, the temperature decreased to 20'(!
The make-up water for hot water supply reached 6076°C due to heating here.

The temperature of the boiler water supply has decreased in this way, guide 1
Heat pipe 3 within the next flow path 12 partitioned by 1
11000. These heat pipes 3
1. The boiler exhaust heat flowing through the combustion exhaust gas duct 2 is received and taken, and the temperature is raised again to nearly 100"0, and the hot water is supplied to the hot water heating coil 4 flowing through the next flow path 12. Warm the water.

During times when the hot water supply load is large, the boiler exhaust heat flowing through the combustion exhaust gas duct 2 by repeating the above-mentioned operation K is efficiently used to heat make-up water for hot water supply via the boiler water supply, and During times when the load is low, the make-up water for hot water supply is heated to a higher temperature to reduce the boiler load, and at the same time, the boiler exhaust heat is recovered until it reaches near its boiling point at normal pressure.

Although the above explanation has been given as an example of heating and hot water supply equipment for commercial buildings, the present invention can also be applied to boiler exhaust heat recovery equipment for factory facilities that require at least 2w1 or more of the fluid to be heated. Needless to say.

As described above, according to the present invention, a heat pipe and a member having a long pipe length through which another fluid to be heated is alternately connected to a feed water heating container formed to allow a first fluid to be heated to flow in a zigzag pattern. Because of this arrangement, not only can the boiler exhaust heat be recovered by the first heated fluid, but even if the boiler exhaust heat cannot be recovered by the first heated fluid, it can be transferred to other heated fluids via this heated fluid. This allows the boiler exhaust heat to be recovered, reducing the exhaust heat recovery efficiency. Not only, but
Since at least 2w1 of the fluid to be heated can be heated by a single feed water heating device, the device can be made inexpensive and simple.

[Brief explanation of drawings]

FIG. 1 is a piping diagram of a conventional exhaust heat recovery device for heating and hot water supply equipment, FIG. 2 is a perspective view of a feed water heating device showing an embodiment of the present invention, and FIG. FIG. 2 is a piping diagram showing an example of heating and hot water supply equipment. 1. Container body for heating water supply, 2. , Combustion gas duct, 3, Heat pipe, 4, Heating coil for hot water supply, A, Circulation line for heating boiler feed water, B, Thread line for heating make-up water for hot water supply Applicant Tokyu Land Corporation Suzuki Metal Industry Co., Ltd. Agent Patent Attorney Keiji Nishikawa 7th! 21 #Togajin Humiliation Combat] Jukuin Storage Tank Figure 3

Claims (1)

[Claims] A feed water heating container formed by a plurality of guide members so as to zigzag the first fluid to be heated is provided on the combustion exhaust gas flow path, and at least one other A feed water heating device using boiler exhaust heat, which is constructed by alternately arranging pipe members with a long flow path through which a fluid to be heated flows and a group of heat pipes whose heat receiving portions face the combustion exhaust gas flow path.