System coupling sludge incinerator with heat supply unit

Abstract

The invention discloses a system coupling a sludge incinerator with a heat supply unit. The system comprises a main steam system of the sludge incinerator, an external heat supply system and an auxiliary steam system of an original unit; a steam outlet of the main steam system of the sludge incinerator is correspondingly connected with a first steam inlet of the external heat supply system and a steam inlet of the auxiliary steam system of the original unit, and a steam outlet of the auxiliary steam system of the original unit is connected with a second steam inlet of the external heat supplysystem; and the main steam system of the sludge incinerator is used for delivering steam to the external heat supply system according to the preset heat supply steam consumption amount. By coupling the sludge incinerator with the heat supply system of a coal-fired unit, the system can make the sludge incinerator run at a stable load for a long time, so that the rated sludge consumption is ensuredand the sludge incineration and the external heat supply are both realized.

Description

technical field [0001] The invention relates to the technical field of energy saving and emission reduction, in particular to a system coupling a sludge incinerator and a heating unit. Background technique [0002] Sludge incineration is currently the mainstream sludge treatment solution. The sludge incinerator is mainly based on the fluidized bed (CFB or BFB). Due to the limitation of the calorific value of the sludge itself and the influence of the furnace type, the main steam parameters at the outlet of the sludge incinerator are generally lower than those of the medium-sized coal-fired units. Therefore, it is generally not recommended to install a separate steam turbine power generation system for the sludge incinerator. The conventional technical solution is to couple the main steam at the outlet of the sludge incinerator with the thermal system of the original coal-fired unit of the power plant. The hot steam enters the middle and low pressure cylinders of the steam ...

AI Technical Summary

Problems solved by technology

When connected to the reheating pipeline in the cold section, the steam volume of the sludge incinerator is limited by the area margin of the furnace reheater of the original boiler. If the margin is insufficient, the power safety of steam and water will be affected

Even if it is connected to the reheating pipe at the hot end, as the load of the raw pulverized coal boiler decreases, the proportion of the steam parameters of the sludge incinerator will increase, which will easily cause the strength and axial thrust of the high and medium pressure cylinders to exceed the standard

If the equipment capacity of the original unit is not allowed, it is necessary to reduce the output of the sludge incinerator to ensure the safety of the unit operation, so that the rated treatment capacity of the sludge cannot be guaranteed

[0005] To sum up, the existing system that couples the sludge incinerator with the thermal system of the original coal-fired unit can only be reduced by reducing the fuel volume of the sludge incinerator when the output demand of the generator set is reduced due to the influence of power grid dispatching. The ratio of coupled steam, in this way, also reduces the sludge consumption, that is, the sludge consumption is indirectly affected by the load of the original coal-fired unit

Therefore, the existing technology of coupling the sludge incinerator with the thermal system of the original coal-fired unit has certain limitations.

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