SU1193362A1 - Boiler plant - Google Patents

Description

The invention relates to the field of power engineering and can be used in power plants on organic fuel ·.

The purpose of the invention is to increase the efficiency of the steam power plant by reducing the flue gas temperature, as well as reducing the specific metal content in the boiler, due to the increase in temperature pressure between the heating and heated media in the zone of convective surfaces of the boiler unit, increasing the available power of the turbine unit preheaters and, ^ increase in reliability of the installation by reducing the heat and load of heating surfaces are relatively unreliable regenerative high pressure heaters.

FIG. 1 shows a diagram of the installation with two stages of an air preheater and two stages of an economizer, and FIG. 2 - the same, with the first stage of the heater, made of two sections.

The installation contains a boiler 1 with two parallel ducts 2 and 3, of which the duct 2 is equipped with steps 4 and 5 of the air heater, and the duct 3 is equipped with steps 6 and 7 of the economizer, and a turbo unit 8 with heaters 9 and 10 of high and low pressure feed water The first in the course of gases stage 6 of the economizer is switched on by water in parallel to the high pressure heaters 9, the second stage 7 is parallel to the low pressure heaters 10, and the gas duct 3 in zone 11 after the second stage 7 of the economizer is connected to gas Run 2 between stages 4 and 5 of the preheater.

2

In the installation scheme, the first stage 4 of the heater is made of two sections 12 and 13 sequentially connected in gas, the gas flue 2

5 between which is additionally connected by a jumper 14 to the gas duct 3 in the zone 15 between the steps 6 and 7 of the economizer. In addition, the boiler. 1 is equipped with a main economizer 16, and

10 turbine · 8 - condenser 17, deaerator 18 and feed pump 19 (figure 2).

The installation works as follows.

15 After the main economizer 16, the flue gases split into two streams. The main stream passes successively two stages 4 and 5 of the air heater and is emitted through the smoke pipe into the atmosphere. The second stream passes through stages 6 and 7 of the economizer, after which it is connected to the main stream in the duct 2, passes through the cold. The stage 5 of the heater’s air passes through the chimney into the atmosphere. The condensate stream after condenser 17 and the first low pressure heaters 10 is branched into two streams, from

30 of which one comes in the following

. The preheaters 10 and the other in the second stage 7 of the economizer, after these heat exchangers, these flows are connected and fed to the deaerator 18.

From the de-aerator 18, the feed water is fed by a feed pump 19 to the inlet of the high-pressure heaters 9 and the first stage 6 of the economizer. Passing the specified heat exchangers, the feedwater flows are combined and fed into the main economizer 16.

Air is drawn from the atmosphere.

45 and enters successively in step 5 and 4 of the air preheater, where

3

1193362

four

is heated to the required temperature and fed to boiler 1.

In the installation scheme, the flue gases from the furnace of the boiler 1, after cooling in convective heating surfaces, pass the main economizer 16, after which they split into two streams. The first, the main stream, is successively cooled in two sections 12 and 13 and stage 5 of the air preheater, after which it is thrown into the chimney. The second stream passes the first stage b of the economizer, after which it branches again into two streams, one of which goes through the jumper 14 to the inlet of the I3 section of the heater, and the second passes through the stage 7 of the economizer and mixes with the main gas flow in the flue 2, passes the cold stage 5 air heater and through the chimney goes into the atmosphere (figure 2).

The boiler plant allows you to increase thermal efficiency, significantly reduce metal consumption, as well as improve reliability.

Fuel economy is achieved due to the economically feasible reduction of the flue gas temperature by reducing the water equivalent of air cooled flue gases in the air heater by draining some of the gases in economizer level 6 and 7, cooled by feedwater, partially bypassing

5 heaters 9 and GO high and low pressure. Under these conditions, the minimum temperature difference between both media in the air heater can be obtained in

10 areas of relatively low gas temperatures, which allows for the last stage 4 of the air heater to be economically justified under these conditions

15 the flue gas temperature is about 120-140 ° С, without any significant energy losses in the machine room.

Saving metal consumption on convective heating surfaces of boiler 1 is achieved due to the fact that the removal of a part of the flue gases at levels 6 and 7 of the economizer leads to an increase in the temperature level of gases, cooling

25 given in the heating surfaces of the secondary superheater and the main economizer, and therefore, to an increase in the temperature head in these surfaces.

Increased reliability due to the fact that the reduced number or surface heating of the heaters 9 high pressure.

Branch PPP "Patent", Uzhgorod, Proektnaya str., 4

Claims (2)

1. BOILER INSTALLATION, containing a boiler with two parallel connected ducts, one of which is equipped with an air heater, and the other with an economizer, and the tour is A unit with high and low pressure feedwater heaters, the latter being connected in water parallel to the economizer, which means, in order to increase efficiency by reducing the temperature of the exhaust gases, the air heater and economizer made of two stages, with the first along the gas flow the economizer stage is connected in water parallel to the high-pressure heaters, and the gas duct with the economizer in the zone after the second stage of the latter is connected to another gas duct between the air stages odogrevatelya. with 50 oo 00 05 N0 > Phie.1 1193362 2. Installation according to claim 1; I'm with the fact that the first stage of the heater is made of at least two consecutive gas-switched sections, the gas duct between which is additionally connected by a jumper to another gas duct in the zone between the economizer steps one