CN204165024U - The burner hearth fire tube convection heating surface structure of tubular oil-burning gas-fired boiler - Google Patents

Abstract

The utility model discloses a furnace fire tube convection heating surface structure of a through-flow fuel gas boiler. The furnace fire tube convection heating surface structure includes a vertically arranged square furnace and a vertically arranged convection heating surface on the right side of the square furnace. The right side of the lower end of the furnace communicates with the smoke inlet at the lower part of the convection heating surface through the lower flue; the lower end of the convection heating surface is fixed on the bottom surface through a bracket; the upper end of the convection heating surface communicates with the smoke inlet of the flue gas economizer through the upper flue ; The square furnace is surrounded by a membrane-type water-cooled wall; the inner cavity of the square furnace, the lower flue and the inner cavity of the convective heating surface together form a U-shaped flue gas circuit. The utility model has the advantages of compact structure, small volume and occupied area, small consumption of steel materials, easy manufacture and installation, high space utilization rate and great heat output power.

Description

Furnace fire tube convection heating surface structure of a through-flow oil-fired gas boiler

technical field

The utility model relates to a heating surface structure of a boiler, in particular to a furnace fire tube convection heating surface structure of a through-flow fuel gas boiler.

Background technique

The traditional horizontal three-pass fire tube boiler occupies a large area, and the horizontally arranged pyrotechnic tubes are not conducive to the discharge of gas condensate water during boiler operation and cleaning water during maintenance; Under high parameters, due to the significant increase in the wall thickness of the boiler shell, the steel consumption of the boiler increases, which makes this furnace type unfavorable for the arrangement of the rear heating surface (such as the condenser) and cannot develop towards large-scale and high parameters. The output thermal power can only reach 21MW. Therefore, the existing horizontal three-pass fire tube boiler has the disadvantages of large volume, small output heat power, large floor area and high steel consumption.

Utility model content

The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a convective heating surface structure of the furnace fire tube of the through-flow fuel gas boiler, which has a compact structure, small volume and floor space, and low steel consumption , and it is easy to manufacture and install, has a large space utilization rate and a great heat output power.

In order to solve the above problems, the utility model adopts the following technical solutions:

The furnace fire tube convection heating surface structure of the through-flow oil-fired gas boiler, the furnace fire tube convection heating surface structure includes a vertically arranged square furnace and a vertically arranged convective heating surface on the right side of the square furnace, and the right side of the lower end of the square furnace passes through the lower part The flue is connected with the smoke inlet at the lower part of the convection heating surface; the lower end of the convection heating surface is fixed on the bottom surface through a bracket; the upper end of the convection heating surface is connected with the smoke inlet of the flue gas economizer through the upper flue;

The square furnace is surrounded by membrane water-cooled walls; the top of the square furnace is provided with a burner for injecting fuel, and the side of the burner is provided with a combustion port at the upper end of the square furnace;

The inner cavity of the square furnace, the lower flue and the inner cavity of the convection heating surface together form a U-shaped flue gas flow path;

The convection heating surface absorbs heat and flows water from top to bottom through the convection nozzle; the square furnace absorbs heat and flows water from the lower end of the membrane water wall to the upper end through the furnace nozzle;

The economizer circulates the water flow through the energy-saving nozzle;

Threaded smoke pipe or light pipe is arranged inside the convection heating surface, and there is a turbulence on the top of the light pipe, which can make the flue gas mix and flow, and improve the heat absorption efficiency.

Preferably, the fuel of the burner is oil, gas, coal powder or coal-water slurry. The burner and the furnace of the utility model can use fuel oil, gas, coal powder or coal-water slurry as fuel, have greater versatility, and have better combustion efficiency and heat output power.

Preferably, a threaded smoke pipe for heat transfer is provided inside the convection heating surface.

Optionally, a light pipe combined with a spoiler for heat absorption is provided in the convection heating surface, and smoke flows through the light pipe. According to the actual fuel conditions, the combination of threaded smoke pipe or light pipe and spoiler can be selected to ensure the best heat conduction efficiency.

The working process of the furnace fire tube convection heating surface structure of the utility model cross-flow fuel gas boiler is as follows:

The burner ejects fuel from the combustion port, and the fuel burns in the square furnace. The flame and flue gas produced flow to the economizer through the lower flue, the convection heating surface, and the upper flue, and the heat of the flue gas is regenerated inside the economizer. Absorption and utilization; the hot water flow in the convection heating surface flows from top to bottom to form convection with the flue gas; the water flow in the membrane water wall flows from bottom to top to form convection with the flue gas.

Advantage and beneficial effect of the present utility model are:

The furnace fire tube convection heating surface structure of the utility model cross-flow fuel gas boiler, the furnace and the convection heating surface adopt a vertical square structure, which has the characteristics of compact structure, can save the site area and improve the space utilization rate;

The furnace fire tube convection heating surface structure of the utility model cross-flow fuel gas boiler has a compact structure, less steel consumption, and a boiler with a large output power can be prepared in a limited space;

The furnace fire tube convection heating surface structure of the utility model cross-flow fuel gas boiler, the side wall of the furnace is a membrane water wall structure, the U-shaped flue gas flow and the water flow are arranged in countercurrent, and the convection heating surface is arranged vertically, which can greatly Improve the heat utilization rate of flue gas, with a heat output power of up to 200MW;

The furnace fire tube convection heating surface structure of the utility model cross-flow fuel gas boiler, and the economizer provided can absorb the gasification latent heat and sensible heat in the flue gas, greatly improving the efficiency of the boiler.

Description of drawings

Fig. 1 is a schematic diagram of the convective heating surface structure of the furnace fire tube of the utility model through-flow fuel gas boiler.

In the figure: 1. Burner; 2. Burning port; 3. Convection heating surface; 4. Spoiler; 5. Convection nozzle; 6. Square furnace; 7. Upper flue; 8. Flue gas economizer; 1. Economizer nozzle; 10. Bracket; 11. Lower flue; 12. Furnace nozzle; 13. Membrane water wall.

Detailed ways

Example 1

As shown in Figure 1, the utility model is a furnace fire tube convection heating surface structure of a through-flow fuel gas boiler. The furnace fire tube convection heating surface structure includes a vertically arranged square furnace 6 and a vertically arranged right side of the square furnace 6 The convection heating surface 3 and the right side of the lower end of the square furnace 6 communicate with the smoke inlet at the lower part of the convection heating surface 3 through the lower flue 11; the lower end of the convection heating surface 3 is fixed on the bottom surface through the bracket 10; The flue 7 communicates with the smoke inlet of the flue gas economizer 8;

A membrane-type water-cooled wall 13 is provided around the square furnace 6; a burner 1 for injecting fuel is provided above the square furnace 6, and a combustion port 2 located at the upper end of the square furnace 6 is provided on the side of the burner 1;

The inner cavity of the square furnace 6, the lower flue 11 and the inner cavity of the convective heating surface 3 jointly form a U-shaped flue gas flow path;

The convection heating surface 3 absorbs heat and flows water from top to bottom through the convection nozzle 5; the square furnace 6 absorbs heat and flows water from the lower end of the membrane water wall to the upper end through the furnace nozzle 12; the economizer circulates water flow through the energy-saving nozzle ; A light pipe is arranged inside the convection heating surface 3, and a spoiler 4 is arranged on the top of the light pipe. The convection heating surface 3 is provided with a light pipe combined with a spoiler to absorb heat, and the light pipe circulates smoke. The fuel of the burner 1 is fuel oil, gas, and coal-water slurry.

Example 2

On the basis of Embodiment 1, the fuel of the burner 1 is fuel oil or gas, and the inside of the convection heating surface 3 is provided with a threaded smoke pipe for heat transfer. Other parts are identical with embodiment 1.

Finally, it should be noted that obviously, the above-mentioned embodiments are only examples for clearly illustrating the utility model, rather than limiting the implementation manner. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in different forms can also be made. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the protection scope of the present utility model.

Claims (4)

1. The furnace fire tube convective heating surface structure of the through-flow oil-fired gas boiler is characterized in that the furnace fire tube convective heating surface structure includes a vertically arranged square furnace and a vertically arranged convective heating surface on the right side of the square furnace, and the square furnace The right side of the lower end of the convection heating surface communicates with the smoke inlet at the lower part of the convection heating surface through the lower flue; the lower end of the convection heating surface is fixed on the bottom surface through a bracket; the upper end of the convection heating surface communicates with the smoke inlet of the flue gas economizer through the upper flue; The square furnace is surrounded by membrane water-cooled walls; the top of the square furnace is provided with a burner for injecting fuel, and the side of the burner is provided with a combustion port at the upper end of the square furnace; The inner cavity of the square furnace, the lower flue and the inner cavity of the convection heating surface together form a U-shaped flue gas circuit; The convection heating surface absorbs heat and flows water from top to bottom through the convection nozzle; the square furnace absorbs heat and flows water from the lower end of the membrane water wall to the upper end through the furnace nozzle; The economizer circulates the water flow through the energy-saving nozzle; A light pipe or a threaded smoke pipe is arranged in the convection heating surface, and a spoiler is arranged on the top of the light pipe. 2. The furnace fire tube convective heating surface structure of the through-flow oil-fired gas boiler according to claim 1, wherein the fuel of the burner is fuel oil, gas, coal powder or coal-water slurry. 3. The furnace fire tube convective heating surface structure of the through-flow oil-fired gas boiler according to claim 2, wherein the convective heating surface is provided with a threaded smoke pipe for heat transfer. 4. The furnace fire tube convection heating surface structure of the through-flow oil-fired gas boiler as claimed in claim 2, wherein the convection heating surface is provided with a light pipe with a spoiler on the top for heat absorption, and the inside of the smoke pipe Circulating smoke.