Method for burning sludge of chain furnace

Abstract

The invention discloses a method for burning sludge in chain grate. A sludge feeding port is arranged on rear arch on the side surface of the chain grate used in the method; and coal and sludge are respectively added into the furnace of the chain grate. The method comprises following steps: adding the coal into the grates of the chain grate through a coal valve from a coal scuttle in front of the chain grate; preheating, drying, and burning the coal sequentially along with the movement of the grates of the chain grate; uniformly adding the squeezed and dewatered sludge alone from the sludge feeding port into the chain grate, wherein the sludge falls onto the grates in a position in the vicinity to the rear arch at 1/2 to 3/4 the tail section of the furnace of the chain grate; and igniting and burning the sludge added in the position by the temperature of the tail section of the furnace of the chain grate when the coal burning is substantially ended, wherein the added amount of the sludge is calculated and adjusted in real time according to the heat value of the coal and the temperature when the added amount is stabilized. The chain grate can ensure complete burning of coal when used for burning various kinds of sludge with heat energy utilization value, thus effectively utilizing the heat value of the sludge and improving the heat efficiency of the chain grate.

Description

technical field [0001] The invention relates to a method for incinerating sludge, in particular to a method for incinerating sludge in a chain furnace, which is suitable for incinerating and treating various sludge with heat energy utilization value. Background technique [0002] The chain furnace is used to incinerate all kinds of sludge with heat energy utilization value. The existing technology is to mix the sludge with coal and use a coal thrower to send it from the coal hopper to the chain furnace. Sludge and coal enter the furnace at the same time. Because the sludge has more volatile matter and less fixed carbon, and most of the volatile matter is fibrous and has a large porosity, the sludge burns faster than coal. If the grate speed is reduced according to the sludge combustion characteristics, there will be insufficient heat source, resulting in problems such as unstable furnace temperature and lower boiler steam pressure; if the grate speed is increased, although t...

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Problems solved by technology

If the grate speed is reduced according to the sludge combustion characteristics, there will be insufficient heat source, resulting in problems such as unstable furnace temperature and lower boiler steam pressure; if the grate speed is increased, although the normal boiler steam pressure and furnace temperature are guaranteed, it will cause problems Incomplete coal combustion occurs, and black coal particles are mixed in the slag

In addition, the control of the throwing amount of the coal thrower is realized by manually controlling the coal throwing speed or controlling the opening of the coal thrower opening. This rough control method will inevitably interfere with the stability of the furnace temperature and affect Thermal efficiency of chain furnace

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