Water tube type vacuum boiler with central reverse flames

Abstract

The invention discloses a water tube type vacuum boiler with central reverse flames. The vacuum boiler mainly comprises a combustor, a casing, a flue gas transfer chamber, a container, a water tube type heat exchanger and a U-shaped tube heat exchanger. The vacuum boiler is characterized in that the boiler casing is formed by butt-jointing an upper arc-shaped barrel and a lower cuboid casing, the U-shaped tube heat exchanger is located at the upper part of the casing, and the container, the flue gas transfer chamber and the water tube type heat exchanger are located at the lower part of the casing; the container is waved, the front end of the container is welded on the flue gas transfer chamber, and the back end is welded on an ellipsoidal gland; a central reverse flame combustion manner is adopted; a plurality of vertical heat exchange tubes are arranged in the water tube type heat exchanger, flue gas inlets of the heat exchange tubes are welded on the flue gas transfer chamber, and flue gas outlets are connected with an exhaust tube. The boiler keeps a certain vacuum degree inside during running, boiler water boils at the temperature lower than 100 DEG C after being heated, steam rises and condenses outside the U-shaped tube heat exchanger to release heat to heat return water in the tube, and condensate water flows back into the boiler. The boiler is compact in structure and higher in heat efficiency and occupies small area, and no external heat exchanger is required.

Description

technical field [0001] The invention relates to the field of gas-fired vacuum boilers, in particular to a safe and efficient water tube type central backfiring vacuum boiler. Background technique [0002] Coal-fired boilers are used in various fields of life and industry, such as schools, hospitals, hotels, etc. It is a kind of equipment with high energy consumption, low thermal efficiency and serious pollution. It is the main source of pollution that causes smog, which seriously affects people. The health of the population has greatly restricted the development of the national economy. The gas-fired boiler has simple and compact structure, high thermal efficiency and low pollution, and is an ideal product to replace coal-fired boilers. The gas-fired vacuum boiler is a national inspection-free product. Its working principle is that a certain degree of vacuum is maintained inside the boiler. After the boiler water is heated, it boils at a temperature lower than 100°C. The st...

AI Technical Summary

Problems solved by technology

Existing central back-firing boilers generally have a dry-back structure in the smoke transfer chamber. When the boiler is running, the front tube plate temperature is high, not only the heat loss is large, but also the heat resistance and sealing performance of the smoke transfer chamber are high.

The high-temperature flue gas is in direct contact with the weld seam, which makes the weld seam prone to cracks

[0004] To sum up, the vacuum boilers currently on the market have disadvantages such as low combustion efficiency, easy cracking of tube sheets, insufficient structure, and large floor space.

Images