Dual-direct-current circulating fluidized bed steam-injection boiler with vertical evaporating pipes inside

Abstract

The invention discloses a dual-direct-current circulating fluidized bed steam-injection boiler with vertical evaporating pipes inside and belongs to the technical field of steam-injection boilers used in oil fields. The dual-direct-current circulating fluidized bed steam-injection boiler with the vertical evaporating pipes inside aims to solve the problem that according to existing natural-circulation steam-injection boilers used in the oil fields, salt deposition happens to the inner walls of water wall pipes, heat transfer deterioration is caused after long-term salt deposition, and pipe explosion is caused accordingly. According to the dual-direct-current circulating fluidized bed steam-injection boiler with the vertical evaporating pipes inside, a coal economizer is communicated with a lower collection box of a water cooling screen through a coal economizer water outlet header pipe, and an upper collection box of the water cooling screen is communicated with two side wall connecting pipes, a front wall connecting pipe and a rear wall connecting pipe; the two side wall connecting pipes are communicated with a steam drum through two side wall water wall lower collection boxes, a front wall membrane type water wall, a rear wall membrane type water wall, a front wall collection box and a rear wall connection box; the water space of the steam drum is communicated with a water inlet of an evaporator, a steam-water mixture outlet of the evaporator is communicated with a mixer through an external centrifugal separator, a superheated steam outlet of a superheater is communicated with the mixer, and the steam space of the steam drum is communicated with a steam inlet of the superheater. The dual-direct-current circulating fluidized bed steam-injection boiler with the vertical evaporating pipes inside inside is used for steam injection of the oil fields.

Description

technical field [0001] The invention relates to a circulating fluidized bed steam injection boiler, which belongs to the technical field of oil field steam injection boilers. Background technique [0002] Most of the existing steam injection boilers in oilfields are oil-fired and gas-fired direct-flow steam-injection boilers. In order to save operating costs, some units have developed coal-fired seam-fired direct-flow steam injection boilers. The implementation of the pollutant discharge standard GB13271-2014 has made the layer-fired steam injection boiler lose the favor of the market. This is because the NOx emission concentration of the layer-fired furnace is much higher than the existing emission standard, and the furnace cannot desulfurize, which makes the environmental protection investment even high. Investment in the boiler itself. So people turn their attention to circulating fluidized bed boilers, because the NOx emission concentration of circulating fluidized bed ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing natural circulation oil field steam injection boiler has the problem that the inner wall of the water wall tube is prone to salt scale, which will lead to the deterioration of heat transfer and the tube burst in the long run, and further provides a double-flow vertical evaporation tube in the furnace. Circulating fluidized bed steam injection boiler

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