JPH102508A - Superheater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superheater to reduce the number of peripheral equipment, be formed in a compact manner, and also reduce an arrangement cost. SOLUTION: A high cycle heat accumulation type combustion burner 20 is arranged at a superheater body 10, having a number of heat transfer pipes 12 disposed at the periphery of a furnace 11 and a fire insulating wall 13 located between the furnace 11 and a heat transfer pipe group 12a, in a state to front on the furnace 11. The fire insulation wall 13 is provided with a combustion gas inflow port 16 through which combustion gas from the combustion burner 20 flows in a heat transfer pipe group area 18 from the furnace 11, and a combustion gas outflow port 17 through which combustion gas returns to the interior of the furnace 11 from the heat transfer pipe group area 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superheater for improving steam conditions by superheating saturated steam or the like in order to improve the efficiency of ordinary power generation and other required steam use.

[0002]

2. Description of the Related Art For example, when power is supplied from an electric power company, if the power is less than 2,000 kW, the type is "high-voltage power supply".
Costly. Therefore, in-house power generation is conceivable, but it is necessary to improve the quality of the steam because the power generation efficiency is poor with the saturated steam of the own boiler. There is a superheater as equipment for improving the quality of steam.

As shown in FIG. 4, a conventional independent superheater 1,
That is, the heat exchanger 2 that does not have a steam generator and performs only superheating of the saturated steam requires the recirculation blower 4 that recirculates the superheater exhaust gas G and dilutes the temperature in the combustion furnace 3.
Further, an air preheater 5 for raising the temperature of the combustion air A with the exhaust gas G, for example, a multi-tube air preheater or a rotary regenerative air preheater (for example, a Jungstrom type) is required, and both are large-scale. Facilities. In addition, in the figure, F has shown the fuel.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a superheater which requires less peripheral equipment, is compact, and requires less installation cost. To provide.

[0005]

That is, a superheater according to the present invention comprises a superheater body having a large number of heat transfer tubes disposed around a furnace and a refractory heat insulating wall provided between the furnace and the heat transfer tube group. To
A high-cycle regenerative combustion burner is provided so as to face the furnace, and, on the refractory insulating wall, a combustion gas inlet through which combustion gas of the combustion burner flows from the furnace into the heat transfer tube group, and the heat transfer tube group. And a combustion gas outlet for returning from the furnace to the furnace.

Further, in the present invention, the combustion gas outlet is arranged near the combustion burner, and the combustion gas inlet is arranged far from the combustion burner. Further, the high-cycle regenerative combustion burner includes a first and second two-system combustor having a regenerator and a combustion burner, and an air pipe for supplying combustion air to the first and second two-system combustor. And a four-way valve provided at an end of the air pipe, and a communication pipe communicating with the four-way valve and the first and second two combustors, respectively.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 10
Denotes a superheater body, and a furnace 11 located at the center thereof.
Around the furnace 11 so as to surround the furnace 11
Is provided. Then, in order to prevent the heat transfer tubes 12 from being burned, the refractory insulation wall 13 is placed between the furnace 11 and the heat transfer tube group 12a.
Is provided. Further, steam headers 14 and 15 are provided at both upper and lower ends of the superheater main body 10 so that the saturated steam S ₁ is supplied to the lower steam header 14 and the superheated steam S ₂ is extracted from the upper steam header 15. It has become.

Further, a furnace 11 is provided above the superheater body 10.
The high-cycle regenerative combustion burner 20 is attached so as to face. As shown in FIG. 2, the high cycle regenerative combustion burner 20 includes a regenerator 21 and a combustion burner 2.
2, a second system combustor 26 having a regenerator 24 and a combustion burner 25, and combustion air is supplied to the first system combustor 23 and the second system combustor 26. A air pipe 27 for supplying A, a four-way valve 28 provided at an end of the air pipe 27, and the four-way valve 28 communicate with the first system combustor 23 and the second system combustor 26, respectively. It is composed of communication pipes 29 and 30.

The cross-sectional areas a of the tips 23a and 26a of the first and second combustors 23 and 26 are made smaller than the cross-sectional areas b of the regenerators 21 and 24, and are ejected from the combustors 23 and 26 into the furnace 11. The flow rate of the combustion gas is increased. However, if the cross-sectional area a of the tip portion 11 is too small, there is a possibility that the return of the combustion gas from the furnace 11 to the first and second combustors 23 and 26 may be hindered.

A combustion gas inflow hole 16 is provided at a lower end of the refractory heat insulating wall 13, and a combustion gas outflow hole 1 is provided at an upper end.
7 are provided. Next, the operation of the superheater will be described. The fuel, for example, natural gas F ₁ supplied to the first-system combustion burner 22 provided in the superheater main body 10 is
The air flows into the first system combustor 23 through the air pipe 27, the four-way valve 28, and the communication pipe 29, and is mixed with the combustion air A heated to a high temperature by the regenerator 21 and burned. Then, the high-temperature (1350 ° C.) combustion gas G is ejected into the furnace 11 through the tip 23 a of the combustor 23. As shown in FIG. 3, the temperature in the furnace 11 is determined by the balance with the radiant heat transfer transmitted to the heat transfer tube 12 through the refractory heat insulating wall 13.

Then, the furnace 11 is moved along the refractory heat insulating wall 13.
The combustion gas G that has flowed down into the heat transfer tube group area 18 from the combustion gas inflow hole 16 at the lower end of the furnace 11,
Rises along the heat transfer tube 12, is converted into superheated steam S ₂ by heating the saturated steam S ₁ of the heat transfer tube 12 therebetween. Then, the combustion gas outlet hole 17 at the upper end of the refractory heat insulating wall 13 is formed.
From the furnace 11 through the furnace 11 into the second combustor 26,
After the heat is stored in the regenerator 24, the low-temperature exhaust gas G 'of, for example, 150.degree.

On the other hand, when the second system combustor 26 operates, the four-way valve 28 is switched, and the combustion burner 2
The natural gas F ₁ supplied to the gas turbine 5 flows into the second system combustor 26 through the air pipe 27, the four-way valve 28 and the communication pipe 30, and flows into the gas turbine exhaust gas G ₁ and the first system combustor 23. The combustion gas G is mixed with the combustion air A heated to a high temperature, for example, 800 ° C., in the regenerator 24 storing the combustion gas G and burned.

The combustion gas G generated at this time is supplied to the furnace 11
After flowing down, heat flows into the heat transfer tube group area 18 through the combustion gas inflow hole 16 at the lower end of the furnace 11 and flows into the heat transfer tube 12.
Converting the saturated steam S ₁ of the inner to the superheated steam S ₂ heating.
Then, after the regenerator 21 is heated, it is discharged out of the system through the communication pipe 19 and the four-way valve 18. Hereinafter, at intervals, for example, at intervals of 20 to 30 seconds, the first system combustor 23
And the combustion of the second combustor 26 are switched with each other, and a high temperature field is formed in the furnace 11.

As described above, since the temperature inside the furnace 11 of the superheater body 10 using the high-cycle regenerative combustion burner 20 is high, the heat transfer surface in the superheater body 10 can be made compact. FIG. 5 shows a heat flow pattern of the superheater according to the present invention, and FIG. 6 shows a heat flow pattern of the conventional superheater.

Here, the terminal temperatures t ₁ and t in FIG.
_2, and t _3, the area i surrounded by t _4, the terminal temperature t ₁ in FIG. _{6 ', t 2', t} 3 ', t 4' is compared with the area B surrounded by, the former Is larger than the latter,
It can be seen that the heat transfer area in the superheater can be reduced accordingly.

[0016]

As described above, according to the present invention, the heat transfer area of the superheater can be made smaller than before. Accordingly, the equipment cost has been reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view of a steam superheater according to the present invention.

FIG. 2 is an enlarged detailed view of a main part of the steam superheater according to the present invention.

FIG. 3 is an explanatory diagram of a heat transfer pattern between a refractory material and a steam pipe.

FIG. 4 is a schematic view of a conventional steam superheater.

FIG. 5 is a heat flow pattern of the steam superheater according to the present invention.

FIG. 6 is a heat flow pattern of a conventional steam superheater.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Superheater main body 11 Furnace 12 Heat transfer tube 12a Heat transfer tube group 13 Fireproof heat insulation wall 16 Combustion gas inlet 17 Combustion gas outlet 18 Heat transfer tube group area 20 High cycle regenerative combustion burner G Combustion gas

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Ryoichi Tanaka, Inventor 2-1-1, Shirite, Tsurumi-ku, Yokohama-shi Inside Japan Finance Corporation (72) Inventor Riki Yasuda 2-53, Shirate, Tsurumi-ku, Yokohama-shi Nippon Gas Industry Co., Ltd.

Claims (3)

[Claims] 1. A high-cycle regenerative combustion system in which a large number of heat transfer tubes are provided around a furnace and a superheater body provided with a refractory heat insulating wall between the furnace and the heat transfer tube group so as to face the furnace. A burner is provided, and on the refractory insulation wall, a combustion gas inlet through which combustion gas of the combustion burner flows from the furnace into the heat transfer tube group area, and a combustion gas outlet from the heat transfer tube group area into the furnace. Superheater provided. 2. The superheater according to claim 1, wherein the combustion gas outlet is disposed near the combustion burner, and the combustion gas inlet is disposed far from the combustion burner. 3. A high-cycle regenerative combustion burner for supplying combustion air to first and second two-stage combustors having a regenerator and a combustion burner and first and second two-line combustors. 3. An air pipe comprising: an air pipe, a four-way valve provided at an end of the air pipe, and a communication pipe communicating with the four-way valve and the first and second combustors. Superheater as described.