JPH0631282Y2 - Gas-fired steam generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is designed to allow combustion gas to flow along the outer wall surface of a box-shaped can body having a water chamber inside to heat and evaporate water in the water chamber. The present invention relates to a gas fuel type steam generator, and more particularly, to a gas combustion type steam generator for improving thermal efficiency.

(Prior Art) Conventionally, in a gas-fired steam generator in which combustion gas is circulated along the outer wall surface of a box-shaped can body having a water chamber inside to heat and evaporate water, In order to improve the thermal efficiency, it is conceivable that fins are provided on the outer wall surface of the can body so as to traverse the flow of the combustion gas.

(Problem to be solved by the invention) However, according to this conventional example, since the resistance of the fins to the flow of the combustion gas is large, the temperature difference between the fins on the upstream side and the fins on the downstream side with respect to the flow of the combustion gas is large. In other words, since the heat distribution rate is biased toward the lower part of the can body, the heat efficiency was low.

The present invention has been made in view of the above circumstances, and an object thereof is to uniformly supply combustion gas to each part of the can body so as to uniformly receive heat in each part of the can body, thereby improving thermal efficiency. To do.

(Means for Solving the Problems) In order to achieve the above object, a gas combustion type steam generator according to the present invention has a large number of combustion tubes arranged below a box-shaped can body,
The corrugated fin peaks or troughs are vertically arranged and fixed on the outer side wall of the box-shaped can body, and the corrugated fin peaks or troughs are arranged on the outer bottom wall in a direction orthogonal to the combustion tube. Fixed configuration.

(Operation) According to the present invention, since the corrugated fins fixed to the outer side wall of the box-shaped can body are arranged such that the peaks or valleys of the fins are parallel to the flow direction of the combustion gas, the resistance to the flow of the combustion gas is reduced. It becomes smaller and is heated uniformly on the outer surface, and the corrugated fins fixed to the outer bottom wall guide the combustion gas in the direction orthogonal to the arrangement direction of the combustion tubes, so the amount of combustion gas flowing to each part of the outer surface wall is uniform. Therefore, the thermal efficiency is increased.

(Example) Hereinafter, the present invention will be specifically described with reference to the drawings.

1 to 3 show a gas combustion type steam generator according to an embodiment of the present invention, FIG. 1 is a vertical sectional view, and FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is the BB of FIG.
It is a line sectional view. In the figure, 1 is a box-shaped can body, 2 is corrugated fins, 3 is a water inlet pipe, and 4 is a steam pipe. The bottom surface 1a of the can body 1 is inclined so that hot air rising from the lower side smoothly flows from one end side to the other end side thereof, and the corrugated fins 2 provided on the outer bottom surface wall 1a have the mountain. And the flow of the valley is arranged and fixed so as to be parallel to the inclination direction. Further, upper and lower two-stage corrugated fins 2 are provided on each of the three-sided outer side walls 1c to 1e except one outer side wall 1b, and these corrugated fins 2 are arranged and fixed so that the flows of the peaks and valleys thereof are directed in the vertical direction. ing. Reference numeral 5 denotes a combustion cylinder that surrounds the box-shaped can body 1.
A heat insulating material 6 is attached to the inner wall. Reference numeral 7 denotes a gas burner, and a large number of combustion tubes 7a constituting the gas burner 7 are arranged orthogonally to the peaks or valleys of the corrugated fins 2 fixed to the outer bottom wall 1a. A blower 8 supplies combustion air. Reference numeral 9 is a water level detection tank, 10 is a drainage tank, and 11 is a drainage valve.

The present invention is configured as described above. First, the steam generating action will be described. When a start operation is performed by an operation device (not shown), a water supply valve (not shown) is opened to start water supply, and the water level in the water level detection tank 9 becomes low. When the predetermined water level is reached, the gas burner 7 burns, and when the water level in the water level detection tank 9 further rises to reach the higher predetermined water level, the water supply is stopped. Combustion gas produced by the combustion of the gas burner 7 rises between the box-shaped can body 1 and the heat insulating material 5, and the water inside the can body is heated by the endothermic action of the corrugated fins 2.
Generates steam. The decrease in the water level due to the steam generation is compensated for by resupplying the water when the water level in the water level detection tank 9 becomes lower than a predetermined low water level. Then, when the ending operation is performed, the gas burner 7 is extinguished, and the water level in the water level detection tank 9 is supplied to a predetermined water level which is somewhat higher than the above high water level, and then the drain valve 11 is opened simultaneously with the closing of the water supply valve. It is valved and the can water is drained. During this drainage, the scale contained in the drainage is captured in the tank 10.

Next, the flow of the combustion gas in the above configuration will be described. Since the corrugated fins 2 fixed to the outer side walls 1c to 1e of the box-shaped can body are arranged so that the peaks or valleys of the corrugated fins are vertical, the combustion gas smoothly passes through the peaks and valleys of the corrugated fins 2. Flow from the bottom to the top, so the difference in the amount of heat absorption between the upper and lower parts of the outer side wall is relatively small,
The thermal efficiency will increase. However, since the distribution of the flow of the combustion gas generated from the combustion tube is generally biased in the longitudinal direction of the combustion tube, when the corrugated fins 2 are fixedly arranged only on the outer side wall, the distribution is in the longitudinal direction of the combustion tube 7a. Although a large amount of combustion gas flows through the outer side walls 1c and 1e, the flow decreases through the outer side wall 1d, and such non-uniformity of the flow of the combustion gas causes a decrease in thermal efficiency. To solve this problem, in the above-described embodiment of the present invention, the corrugated fins 2 fixed to the outer bottom wall 1a are arranged so that their peaks or valleys are orthogonal to the longitudinal direction of the combustion pipe 7a. Is guided by the corrugated fins 2 to the outer side wall 1d which is the lateral direction of the combustion pipe 7a, and the non-uniformity of the flow of the combustion gas is eliminated.

(Effects of the Invention) According to the above description, the corrugated fins are arranged on the outer side wall of the box-shaped can body in the vertical direction in the direction of the peaks or valleys, and the corrugated fins are mounted on the outer bottom wall of the peaks. Alternatively, since the valley direction is arranged orthogonal to the longitudinal direction of the combustion pipe, the amount of combustion gas flowing through the outer side wall is made uniform,
Moreover, since the combustion gas smoothly flows through the outer side wall, it is possible to provide a gas combustion type steam generator having high thermal efficiency and thus being economical.

[Brief description of drawings]

1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG. 1 ... Box-shaped can 1a ... Outer bottom wall 1c-1e ... Outer side wall 2 ... Corrugated fin 7 ... Gas burner 7a ... Combustion tube

Claims (1)

[Scope of utility model registration request] 1. A gas burner comprising a large number of combustion tubes disposed below a box-shaped can body having a water chamber inside,
On the outer side wall of the box-shaped can body, corrugated fins are arranged vertically in the direction of the peaks or valleys, and on the outer bottom wall, the corrugated fins are arranged in the direction of the peaks or valleys with the longitudinal direction of the combustion pipe. A gas combustion type steam generator characterized by being arranged orthogonally.