Energy-saving method and energy-saving device for boiler

Abstract

The invention discloses an energy-saving method and an energy-saving device for a boiler. Heat exchange on high-temperature boiler feedwater at the temperature ranging from 105 DEG C to 130 DEG C is carried out through a boiler feedwater temperature reduction device, so that the temperature falls to range from 30 DEG C to 80 DEG C; then heat exchange between the boiler feedwater ranging from 30 DEG C to 80 DEG C and boiler smoke is carried out through a boiler economizer, so that the boiler exhausted smoke temperature falls to range from 100 DEG C to 130 DEG C; and the high-temperature boiler feedwater obtained after heat exchange enters a boiler system. The energy-saving device comprises the boiler and the boiler economizer, and further comprises the boiler feedwater temperature reduction device; a first boiler feedwater inlet of the boiler feedwater temperature reduction device is connected with a boiler feedwater pump, and a first boiler feedwater outlet of the boiler feedwater temperature reduction device is connected with a second boiler feedwater inlet of the boiler economizer; and a second boiler feedwater outlet of the boiler economizer is connected with a water inlet of the boiler, and the boiler feedwater temperature reduction device is further provided with a cold medium inlet and a hot medium outlet. As the energy-saving method and the energy-saving device are used for conducting energy-saving transformation on the boiler, the boiler exhausted smoke temperature can be reduced by more than 10 DEG C to 60 DEG C, and the boiler heat efficiency can be improved by more than 2%.

Description

technical field [0001] The invention belongs to the technical field of boilers, and in particular relates to a boiler energy-saving method and an energy-saving device. Background technique [0002] As a big energy consumer, the importance of energy issues is well known. In order to standardize boiler energy-saving requirements, the State Bureau of Technical Supervision promulgated TSG G0002-2010 "Boiler Energy-Saving Technology Supervision and Management Regulations" on August 30, 2010, which made requirements for various boiler thermal efficiency and other indicators. Energy conservation and emission reduction has also become the main development direction of the boiler industry. [0003] The exhaust heat loss ranks first in the boiler heat loss, and the main factors affecting the exhaust heat loss are the exhaust gas temperature and the boiler leakage (excess air coefficient). Among them, the exhaust gas temperature has the greatest influence, and the exhaust gas tempera...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that most of the existing boiler systems use desalinated water at a temperature of 105°C. Due to the high temperature of the feed water, the exhaust gas temperature of the boiler can only be reduced to 150~160°C.

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