RU2468290C1 - Method for enlarging heating surface of boiler plant by changing water wall section design - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: two water wall sections are manufactured by welding semi-U-bends to sections; boiler plant is shutdown and circulating pump is stopped; boiler is cooled down during 2-3 days; heat carrier (water) is drained from the boiler sections; U-bends attaching the headers of water wall section to water wall circulating section are detached; upper part of the boiler setting is disassembled; water wall sections are removed from furnace volume and new water wall sections are installed in their places; headers of the sections are connected by means of U-bends and setting of the boiler upper part is recovered.

EFFECT: development of heating surface enlarging method.

2 dwg

Description

The invention relates to energy and can be used in boilers to increase the heating surface (heating) of a boiler plant, which is under the influence of combustion products of gaseous, liquid and solid fuels.

Known methods for increasing the heating surfaces of boilers are that during repair, parts of the heating surfaces of the boilers are replaced, old blocks are removed and new ones are inserted (see, for example, RF patent 2219434, publ. 12.20.2003).

The prototype of the invention is a hot water boiler according to A.S. USSR 1756745, publ. 08/23/1992, in which it is possible to install, repair and replace part of the heating surface due to the autonomous circulation of water in these heating surfaces.

A disadvantage of the known analogues is their low heat output due to the low degree of heat recovery of the combustion products.

The objective of the invention is to develop a method of increasing the heating surface, which is under the influence of combustion products formed during the combustion of fuel in the boiler.

To solve this problem, a method for increasing the heating surface (heating) of the boiler installation by changing the design of the screen sections, which is carried out by the fact that two screen sections are made by welding to half-shell sections, stop the operation of the boiler installation, stop the circulation pump, allow the boiler to cool for 2-3 days, coolant (water) is drained from the boiler sections, uncouplers that connect the collectors of the screen section with the screen-circulation section, disassemble the top th part of the boiler lining, the screen sections are removed from the furnace volume, the manufactured screen sections are installed in their place in the place of the extracted ones, the collectors of the section are connected with kalach, the lining of the upper part of the boiler is restored.

When the boiler is working with advanced sections (to which felts are welded), the temperature of the coolant rises, the loss of thermal energy with flue gases decreases. Increasing the temperature of the coolant (water) allows to reduce the load of burners operating on gaseous and liquid fuels, and the amount of solid fuel, i.e. there is a decrease in the consumption of gaseous, liquid and solid fuels.

In the normal mode of operation of the boiler plant, one of the main tasks is to make the most complete use of the heat of the combustion products of the fuel. In order to reduce the temperature of the combustion products, it is necessary to increase the surface of heating (heating) of the boiler installation.

The surface of heating (heating) of a boiler installation is the surface washed on one side by heat carrier (water), and on the other hand, by the combustion products of gaseous, liquid, and solid fuels.

The invention considers the possibility of increasing the heating surface (heating), which is under the influence of the combustion products of the fuel.

Figure 1 presents the screen and screen-circulation sections of the boiler.

Figure 2 presents the view of the screen sections of the boiler after welding to them half-hooks.

In figure 1 and figure 2 is indicated:

1 - Screen-circulation section;

2 - Screen section before changing its configuration;

3 - Collectors;

4 - Screen section of the modified, augmented configuration;

5 - Half-welded to the screen section.

In normal mode, the coolant (water) is under the influence of combustion products in two screen - 2 and two screen-circulation sections 1 (see figure 1).

Sections 1 and 2 through collectors 3 are interconnected by kalach. The circulation of the coolant is ensured by the operation of the circulation pumps.

The task of increasing the heating surface (heating) of the boiler installation is as follows:

a) make two screen sections, welding to the screen sections 2 half-hooks 5, as shown in figure 2. Half-hooks can be used factory-made, or can be made independently with a pipe bender;

b) stop the operation of the boiler installation;

c) stop the circulation pump and allow the boiler to cool for 2-3 days;

d) drain the coolant (water) from the boiler sections, undock the hooks connecting the collector 3 with the screen section 2 and the screen-circulation-screen section 1;

e) disassemble the upper part of the boiler lining;

g) remove the screen sections 2 from the furnace volume;

h) install the screen sections 4 made according to paragraph “a” into the place of those extracted according to p.

f) connect the collectors of section 1 and 2 with pipes;

i) restore the lining of the upper part of the boiler.

Note: further operations are performed as usual.

Prior to the execution of items the length of the screen section is 300 cm, and after performing these operations, its length will be

L = nR × 7 = 3.14 × 25 × 7 = 549.50 cm,

where n = 3,14

R = 25 cm

7 - the number of welded rolls.

With this embodiment, with the same diameter of the pipes from which the sections are made, the heating surface of the screen section is almost doubled.

The practical use of this invention does not cause difficulties and high material costs, because in any boiler room with 3-4 operated boilers, there is always a spare set of 2 screen sections and 2 screen-circulation ones.

After completing work on the method, the temperature of the flue gases - combustion products - decreases by 30-35 ° C, and the temperature of the coolant (water) increases by 20-25 ° C, and the flow rate of gaseous, liquid and solid fuels decreases by 12-15%, equal conditions.

Claims (1)

The method of increasing the heating surface (heating) of the boiler installation by changing the design of the screen sections, characterized by the increase in the heating surface of the boiler installation, is carried out by the fact that two screen sections 4 are made by welding half-rags to the sections 2, stop the boiler installation, stop the circulation pump, give cool down the boiler for 2-3 days, drain the coolant (water) from the boiler sections, undock the hooks connecting the collectors 3 of the screen section 2 with the screen-circulation with ktsii 1, disassembled upper part of lining the boiler is recovered screen section 2 of the furnace volume, adjusted to their spot made screen section 4 to place the extracted were combined collector sections 1 and 2 of the roll, is reduced wet construction the upper part of the boiler.

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