Heat supply network water drainage heating system capable of improving economical efficiency of heat supply unit

Abstract

The invention relates to a heat supply network water drainage heating system capable of improving economical efficiency of a heat supply unit, aiming to solve the problem about absence of a water drainage heating system which has remarkable effects of energy conservation and emission reduction at present. The heat supply network water drainage heating system comprises a heat supply network heater, a water drainage pump, a primary low-pressure heater, a secondary low-pressure heater, a primary turbine steam extraction pipe and a primary condensed water inlet pipe, and is characterized by further comprising a water drainage heater, a heat supply network water return branch pipe, a heat supply network water supply branch pipe, a water drainage inlet pipe, a water drainage outlet pipe, a water drainage heater bypass, a water drainage pipe, a water drainage pipe valve and a bypass valve. two ends of the water drainage inlet pipe are respectively connected to the heat supply network heater and the water drainage heater, two ends of the water drainage outlet pipe are respectively connected with the water drainage heater and the primary condensed water inlet pipe, the bypass valve is mounted on the water drainage heater bypass, and two ends of the heat supply network water supply branch pipe are respectively connected to the water drainage heater and the heat supply network water supply manifold. The heat supply network water drainage heating system is reasonable in structural design, and remarkable in energy conservation and emission reduction effects.

Description

technical field [0001] The invention relates to a heating network drainage heating system, in particular to a heating network drainage heating system that improves the economical efficiency of a heating unit, belongs to the field of steam extraction and heating supply systems in thermal power plants, and can be widely used in the heating network heating systems of thermal power plants, especially It is suitable for thermal power plants with relatively low return water temperature in the heating network and large-scale centralized heating systems. Background technique [0002] In recent years, with the increasing implementation of national energy conservation and emission reduction, the pressure on the power system is also increasing; in addition, with the development of urban central heating, the heating area received by thermal power plants is increasing. How to increase the output value of unit energy consumption has become an urgent problem to be solved in thermal power p...

AI Technical Summary

Problems solved by technology

The heat network heater of the first heat supply station of a thermal power plant generally does not have a drain cooling section, and the design drain temperature is the saturation temperature corresponding to the extraction pressure, but in actual operation, the return water temperature of the heat network is very low, generally between 30°C and 60°C In between, there is a certain supercooling in the hydrophobic, and the degree of supercooling fluctuates with the return water temperature. The hydrophobic temperature is generally around 90°C, and the difference between the hydrophobic ends is between 30°C and 60°C. The heat transfer with such a large temperature difference causes huge Irreversible loss, and the sensible heat of hydrophobicity is not fully used for external heat supply

[0003] For example, the date of publication is July 24, 2013, and the Chinese patent with the publication number CN203082865U discloses a supercritical heating and heating unit heat network heater drainage recovery device, which includes at least one heat network heater. The drainage outlet pipe of the heating network heater is equipped with a conductivity meter and a drainage pump of the heating network heater. Drainage recovery and heat recovery of unit heating network heater improve the operating economy of the unit, but its structure is complex and the cost of equipment investment is high

Another example is that the publication date is January 02, 2013, and the publication number is CN202647719U in the Chinese patent, which discloses a subcritical wet-cooling heating unit heat network drainage treatment system, which includes a condenser, a low-pressure heater, and a heat network heating system. The heat network heater is equipped with a hydrophobic cooling section. The condensed water output from the condenser enters the deaerator through the condensate pipe through several groups of low-pressure heaters, and the steam output from the steam turbine is exchanged by the heat network heater. The water generated after heating is transported to the condensate pipe before the final low-pressure heater through the water pipe, and the economy is not significant enough

[0004] To sum up, there is currently no one that can recover the sensible heat of the heating network heater, reduce the irreversible loss in the heat exchange process, replace the high-grade heating extraction steam with relatively low-grade extraction steam, and reduce the consumption of high-grade extraction steam. Increase the working capacity of the steam turbine, improve the thermal efficiency of the unit, and a hydrophobic heating system with obvious energy saving and emission reduction effects

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