Boiler Room Renovation

From August 28, 2016, to October 30, 2016, our company, commissioned by Dalian Thermal Power Co., Ltd., undertook the renovation project of the Hongqi Boiler Room, which involves replacing two 3.5 MW solid‑state electric thermal storage boilers. This project is part of a coal‑to‑electricity heating conversion initiative for the boiler room, utilizing solid‑state electric thermal storage as the primary heat source. The Hongqi Boiler Room serves a heating area of 105,400 m², located in a bustling central urban district within a residential community. The original heating system consisted of two coal‑fired hot water boilers; however, their emissions failed to meet national air pollutant standards. In response, the government has promoted policies to replace coal with electricity or gas in city centers, encouraging the use of clean energy for heating. Accordingly, the existing coal‑fired boilers were dismantled and replaced with two 3,500 kW solid‑state low‑tariff electric thermal storage boilers. With a design heat load of 45 W/m², the system provides round‑the‑clock heating to the residential area. The solid‑state electric thermal storage hot water unit uses electricity as its heat source, leveraging inexpensive nighttime power to heat a solid‑state thermal storage medium and store the heat. During peak grid demand periods, the unit shuts down, and heat is supplied from the stored hot water in the thermal storage tank, with outlet temperatures adjustable between 30°C and 70°C. The thermal storage bricks are manufactured using a specially formulated composition, ensuring a specific heat capacity of at least 1.46 kJ/kg·K and a maximum service temperature of up to 1,350°C. Designed for a service life of 25 years, they maintain structural integrity without crumbling or cracking, eliminating the need for replacement over that period.