RU2791918C1 - Boiler plant - Google Patents

Abstract

FIELD: heat engineering.

SUBSTANCE: invention relates to the field of heat supply and can be used in boiler installations running on natural gas. The boiler plant contains a gas-tight boiler with a flue of exhaust gases and a flue of exhaust gas recirculation, a blow fan, a regenerative air heater, a flue gas recirculation pump, a deaerator connected via a desorbing medium to the flue of exhaust gases of a gas-tight boiler in front of a regenerative air heater.

EFFECT: increase in the reliability of the operation of the deaerator and the boiler plant as a whole by ensuring the required quality of deaeration of additional feed water provided by the use of a desorbing agent: the exhaust gases of a gas-tight boiler with a minimum oxygen content.

1 cl, 1 dwg

Description

The invention relates to the field of heat supply and can be used in boiler plants running on natural gas.

An analogue is known - a boiler plant containing a gas-tight boiler with a flue gas flue, a smoke exhauster and a chimney, a deaerator with pipelines for the removal and supply of a desorbing agent, the supply of source water and the removal of deaerated water (see Boiler plant // Patent of Russia No. 2700485. 2019. Bull. No. 16. / Sharapov V.I., Kamalova R.I., Rodionova E.A.). This analog is taken as a prototype.

The disadvantage of analogue and prototype is the low reliability of the deaerator due to the significant oxygen content in the flue gases used as a desorbing agent and taken between the smoke exhauster and the chimney, which does not provide the required quality of deaeration of additional feed water. The increased oxygen content in the exhaust gases is associated with air flows into the exhaust gases in the regenerative air heater, as well as suction of atmospheric air through leaks into the furnace and gas ducts due to the operation of the gas-tight boiler under a vacuum provided by the operation of the smoke exhauster. The normative value of the air flow in the regenerative air heater is 25%, and the normative suction in the furnace of a gas-tight boiler is 3%.

The technical result achieved by this invention is to increase the reliability of the operation of the deaerator and the boiler plant as a whole by ensuring the required quality of deaeration of additional feed water, provided by the use of a desorbing agent - flue gases of a gas-tight boiler with a minimum oxygen content.

To achieve the technical result, a boiler plant is proposed, containing a gas-tight boiler with a flue gas flue and a flue gas recirculation flue, a draft fan, a regenerative air heater, a flue gas recirculation smoke exhauster, a deaerator connected via a desorbing medium to the flue gas flue of the gas-tight boiler.

The peculiarity lies in the fact that the deaerator is connected through the desorbing medium to the flue gas duct of the gas-tight boiler in front of the regenerative air heater.

Schematic diagram of the boiler plant is shown in the drawing. The boiler plant comprises a gas-tight boiler 1, a flue gas flue 2, a deaerator 3, connected by a desorbing medium into the flue gas flue 2 between the gas-tight boiler 1 and the regenerative air heater 4. A feed water supply pipeline 5 is connected to the upper part of the deaerator column 3. Also connected to the deaerator 3 is a deaerated feedwater outlet pipeline 6, which includes a feed pump 7. An alkaline agent dosing system 8 is connected to the deaerated feedwater pipeline 6. The blower fan 9 directs air to the regenerative air heater 4. To the flue gas flue 2 between the deaerator 3 and the chimney 10 is connected flue 11 flue gas recirculation, which includes a smoke exhauster 12 flue gas recirculation. Pipeline 13 for supplying natural gas is connected to the furnace of the gas-tight boiler 1.

The boiler plant works as follows.

Used as a desorbing agent, the flue gases of the gas-tight boiler 1, taken before the regenerative air heater 4, are fed through the flue gas duct 2 to the lower part of the deaerator column 3. The flue gases, rising up inside the deaerator structure, cross the water jets, heating the source water to saturation temperature, ensure the release of corrosive gases and the mixing of the latter with a desorbing agent. The mixture of exhaust gases and corrosive gases and water vapor released from the source water is removed from the upper part of the column of the deaerator 3 through the exhaust gas duct 2 into the chimney 10. The water deaerated in this way is discharged from the deaerator 3 using the feed pump 8, passes through the dosing system 8 alkaline agent (sodium hydroxide), which helps to remove corrosive carbon dioxide from the water. Then the deaerated water is supplied to the economizer of the gas-tight boiler 1. The gas mixture of flue gases and emitted corrosive gases, water vapor after the deaerator 3 through the exhaust gas recirculation duct 11 is directed to the upper part of the furnace of the gas-tight boiler 1, which allows reduce the oxygen concentration in the fuel combustion zone and reduce the combustion temperature.

The draft fan 9 pumps primary air, which, before being fed into the furnace of the gas-tight boiler 1, is heated in the regenerative air heater 4 and mixed with natural gas, which enters through the natural gas supply pipeline 13.

The proposed boiler plant makes it possible to ensure reliable operation of the deaerator and the boiler plant as a whole by ensuring the required quality of deaeration of additional feed water, provided by the use of a desorbing agent - flue gases of a gas-tight boiler with a minimum oxygen content.

Claims (1)

A boiler plant comprising a gas-tight boiler with an exhaust gas flue, a deaerator with supply and deaerated water supply pipelines, characterized in that the deaerator is connected via a desorbing medium to the flue gas flue of the gas-tight boiler in front of the regenerative air heater.

Images