JPS6016810Y2 - A boiler water preheating device that preferentially supplies heated, low-density water into the boiler. - Google Patents

Description

[Detailed description of the invention] The present invention relates to a feed water preheating device for a boiler, which preheats make-up water before injecting it into the can to promote heating within the can and improve efficiency. A system that is compactly attached to the boiler body, lengthens the preheating time for its supply water, and injects the preheated water with low density into the can body preferentially over other water. So, to explain the illustrated example, 1 is a can body, inside of which is a furnace tube 3 in which a burner 2 is attached, and an internal smoke tube 4 that communicates with it via a flame tube 3' attached thereto, and on the top surface of which steam is A cleaning opening 6 inside the can is formed on the side surface of the reservoir 5.

A vertical smoke pipe 4' communicates with the terminal end of the internal smoke pipe 4, passes through the lower surface of the can body, extends outward from the bottom, and is further connected to an external smoke pipe 7 from there.

This external smoke pipe is arranged along the lower longitudinal direction of the can body 1, and is inclined slightly upwardly toward the rear end, and a preheating water tank 8 is formed around the external smoke pipe over almost the entire length.

A water supply pipe 9 on the lower side of the slope is connected to this preheating water tank, and an injection pipe 10 whose tip end is inserted into the can body 1 is provided from the upper surface of the upper side of the slope.

On the other hand, 11 is an automatic water supply tank with a built-in float valve (not shown), etc., which is placed outside the can body and which attempts to maintain the water level inside the can body and the water level in the tank at the same level at all times. When a difference in water level occurs, the valve opens and water is first supplied to the tank, and then to the can body.

The water supply pipe 9 is connected at one end to the preheating water tank 8 and at the other end to the tank 11.

12 is a pipe from the water supply to the tank 11.

Note that this tank 11 can be raised and lowered by a lifting device 13, thereby making it possible to change the predetermined water level inside the tank as appropriate.

Therefore, if a predetermined amount of water is supplied to the tank 11 of the can body 1 in advance, water will also be stored in the preheating water tank 8.

Next, when the burner is combusted, the combustion smoke is released into the furnace tube 3 and the flame box 3'.
The water is exhausted from the chimney through an internal smoke pipe 4, a vertical smoke pipe 4', and an external smoke pipe 7, during which time the water is heated.

Then, as steam is generated, the water level inside the can gradually begins to fall, and when the water level in the tank also falls, the float valve opens and water is supplied to the tank, and the water in the preheating water tank 8 also flows into the tank due to the difference in water head pressure. Water is poured into the body.

At this time, the preheating water tank 8 is located at the rear end, that is, the water injection pipe 1
Since it is sloped upward toward the 0 side, the water with low density heated in this tank is given priority to this water injection pipe 10 over other water.
As the water moves to , more heated water is successively poured into the can.

According to the present invention described above, water can be supplied to the can body after being heated in advance, and since the preheating is performed using waste heat, the thermal efficiency can be significantly improved.

Since the preheating water tank for this purpose is placed at the bottom of the can, even if it is configured to have the same length as the can, the preheating time can be extended without interfering with peripheral equipment, and the preheating device can be attached. This does not cause the aircraft to become larger.

In addition, the preheating water tank is tilted slightly upward toward the side where the water injection pipe is attached to the can body, and the water injection pipe is connected to the upper surface of the upper sloped side, and the water supply pipe from the automatic water supply tank is connected to the lower sloped side. Due to the difference in head pressure between the water surface and the water surface inside the tank, the water will flow automatically without the need for a separate pump, etc.
The heated water having a low density is sequentially supplied into the can body with priority over other water, and the preheating effect can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line X--X in the same figure. 1... Can body, 3... Furnace cylinder, 4...
...Internal smoke pipe, 7...External smoke pipe, 8...
・Preheating water tank, 9... Water supply pipe, 10...
Water injection pipe, 11... Water tank.

Claims (2)

[Scope of utility model registration request] (1) Furnace cylinder 3 to which the burner is attached and internal smoke pipe 4 following it
In a boiler having a can body 1 with a built-in can, and an automatic water supply tank 11, which is a water tank disposed outside the can body and in which water is always supplied to a constant water level using a float valve, etc., the terminal side of the internal smoke pipe is , penetrates the lower surface of the can body and extends outward from the bottom, and is connected to an external smoke pipe 7 extending along the longitudinal direction of the can body below the can body. A preheating water tank 8 is formed that is slightly upwardly inclined in the longitudinal direction of the can body, and a water supply pipe 9 that communicates with the water supply tank 11 is connected to the lower side of the slope of the iron tank 8, and the upper surface of the sloped upper side is connected to the can body. A water supply preheating device for a boiler, which is provided with a water injection pipe 10 inserted into a boiler, and is configured to preferentially supply heated, low-density water into a boiler. (2) The external smoke pipe is inclined, a preheating water tank is provided concentrically around the iron pipe, and the preheating water tank 8 is slightly inclined upward in the longitudinal direction of the can body. A boiler water preheating device configured to preferentially supply the heated, low-density water described in item 1) into a boiler.