CS252103B1 - A method of utilizing the heat of a medium in a steam generator at the time of shutting down its heating - Google Patents

Abstract

The aim of the solution is to achieve a more uniform and economical production of steam. This aim is achieved by heating the medium in the steam generator with a shut-off heater, which is heated during the time of non-peak steam extraction by means of heat and mass transport of the medium from the operating generator, which is then gradually degassed and transformed into steam for replenishing the steam network during peak steam extraction. The solution can also be used in steam generators in power plants and heating plants.

Description

The invention relates to a method of using the heat of a medium in a steam generator at the time of shutting down the heating system.

At present, ee does not utilize the heat of the medium in the shut down steam generator.

The disadvantages of not utilizing the heat of the medium in the steam generator are largely eliminated by the use of the medium in the steam generator at the time of shutting down its heating according to the invention, which consists in the hot water from the evaporator system opening to the expansion system. and the resulting steam is then distributed to the steam distribution.

The process of the invention utilizes the heat of the medium in the steam generator at the time of shutdown of its heating. By utilizing heat in the medium, the operation in power plants and heating plants is rationalized at the time of maximum and minimum heat consumption. Steam generators are not overloaded at the time of maximum steam extraction, nor are they operated uneconomically at the time of minimum steam extraction.

At the time of minimum steam withdrawal, some of the heat generated by the steam generator is used to transport heat and mass to the steam generator with shutdown heater, thereby increasing the pressure and temperature of the medium of the steam generator with shut down heater, used for supply to the steam distribution. In this way, the amount of steam produced in the steam generators is uniform, which means more economical operation of the power stations and heating plants, since the operation approaches the economical amount of steam produced.

The attached figure shows the process of utilizing the heat of the steam generator medium according to the invention for a 34.7 kg.a ', 9.32 MPa, 540 ° C with natural circulation steam generator after its heating has been shut down and the medium has been heated to 300 ° C. e 9.2 MPa and transport of heat and mass of the medium from the operated neighboring steam generator.

The booster generator has schematically indicated a booster system 1, a boiler drum 2, a steam superheater 1, a sludge chamber 6, a blowdown expander 2 separating the fittings 8, g, 2, 11 ', the discharge pipe Z, the fittings 10 and 11. control valve 14, condensate collector 15 and manifold 1Z «

After the boiler heating is shut down, the copper in the pressure parts of the boiler is kept at the parameters as close as possible to the operational, reheating by means of heat and mass transport of the medium taken, for example, at the adjacent operated steam boiler. The post-heating is performed at a time when there is no need to operate the boiler with nominal steam flow.

At the time of the required increased steam flow for steam forces, the heat of the boiler medium with shutdown heating is utilized by connecting the boiler ee with the blowdown expander 2 via a separating fitting 2 to the blowdown chamber 1 through blowdown piping Z>. fi. The hot water from the evaporator system 1 is started to be drained by opening the separating fittings f1 through the open fittings ff into the blowdown expander f1 according to the desired demand. The drainage valve 10 for the duct, the drainage valve H for the operating expander, the blowdown valve 12 for blowing off the boiler drum and the dam valve 11f at the steam outlet of the boiler are closed. The condensate level in the blowdown expander fi is maintained by discharging to the condensate collector 1fi; by the control valve 11 · From the blowdown expander fi, the expanded steam flows through the 1Z distribution line to the steam distribution of 0.15 MPa.

Claims (1)

SUBJECT OF THE INVENTION A method of utilizing the heat of a medium in a steam generator at the time of shutting down its heating while maintaining the medium parameters as close as possible to 10056 operating parameters, by transporting the heat and mass of the medium from the operated, e.g. neighboring steam generator, characterized in By opening the lower shut-off valves, the evaporator system leads to the expansion system and the resulting steam is then distributed to the steam distribution system.