Method for arranging four separators of circulating fluidized bed boiler in parallel

Abstract

The invention discloses a method for arranging four separators of a circulating fluidized bed boiler in parallel. The cross section of a hearth is axisymmetric about the center line of the front walland the rear wall of the hearth and the center lines of the left and right side walls of the hearth; the four cyclone separators, namely a first cyclone separator, a second cyclone separator, a thirdcyclone separator and a fourth cyclone separator are arranged on the rear wall of the hearth in parallel; each of the four cyclone separators is composed of an inlet flue and a cylinder body; and thelengths of intersecting lines of inlet flues of the four cyclone separators and the rear wall of the hearth are equal. The method has the beneficial effects that the four cyclone separators are arranged at the single side of the boiler in parallel, the hearth of a conventional large circulating fluidized bed boiler is simplified into four circulating loops, the system structure and running operation are simplified, and the uniformity of the circulating loops is improved; and due to the arrangement of the inlet flue of each cyclone separator, the flow distribution of smoke and particles is moreuniform, and the consistency of the performance of each cyclone separator is ensured.

Description

[0001] This application is a Chinese invention application, the name of the invention: a circulating fluidized bed boiler with four separators arranged side by side and its arrangement method, the application date is September 1, 2020; the application number is a divisional application of 202010902613.X. technical field [0002] The invention belongs to the technical field of circulating fluidized bed boilers, and in particular relates to a method for arranging four separators of circulating fluidized bed boilers side by side. Background technique [0003] The cyclone separator is one of the key components of the circulating fluidized bed boiler. Its main function is to separate a large amount of high-temperature solid materials from the flue gas and send them back to the combustion chamber to ensure efficient combustion and heat transfer in the furnace. With the enlargement and high parameterization of circulating fluidized bed boilers, the diameter and number of cyclones co...

AI Technical Summary

Problems solved by technology

(2) Modular design is adopted. This method adopts the mature layout method of small-capacity cyclone separators, and through modular amplification, the gas-solid flow uniformity among multiple cyclone separators in this method is improved due to the significant change in the cross-sectional scale of the furnace. Difficult to guarantee

(4) For ultra-supercritical boilers with larger capacity and higher parameters, such as 1000MW ultra-supercritical circulating fluidized bed boilers, multiple cyclone separators are symmetrically arranged on both sides of the furnace to improve the uniformity of gas-solid flow. The new patent 201620647494.7 discloses a 1000MW class ultra-supercritical parameter circulating fluidized bed boiler. Eight cyclone separators are symmetrically arranged on both sides of the furnace to improve the flow uniformity of the furnace. Although the eight cyclone separators are symmetrically arranged in this method, the The flue structure at the tail of the separator outlet cannot achieve symmetry, and due to the mismatch of multiple flue resistances, it is difficult to ensure the uniformity of gas-solid flow

[0007] (2) When four cyclone separators are arranged side by side on one side of the furnace, due to the increase in the number of cyclone separators and circulation circuits on one side, the gas-solid flow in the four circulation circuits is uneven, resulting in a large deviation between the bed temperature and the steam temperature

Images