Burning method for pulverized solid fuels transferred by dilute phase pneumatic in tunnel kiln and dilute phase pneumatic transferring system

Abstract

The invention discloses a burning method for pulverized solid fuels transferred by dilute phase pneumatic in a tunnel kiln and a dilute phase pneumatic transferring system. The method is to transfer solid carbonaceous fuel powder through dilute phase pneumatic which combines positive pressure pressing-deliver type and negative pressure inhaling-deliver type, directly spray the powder into a tunnel kiln to burn, wherein the solid carbonaceous fuel powder is sulfurized three times during the transferring process. According to the invention, the structure of existing tunnel kilns is not changed,pulverized solid fuels (such coal powder, petrol coke powder etc. ) which are utilized as fuel for firing refractory material, are directly sprayed into the kiln to burn, thereby greatly increasing the utilization rate of the fuel, saving fuel cost and reducing cost for firing refractory material.

Description

technical field [0001] The invention belongs to the technology of firing refractory materials with tunnel kiln fuel, and in particular relates to a technology of using carbon-containing solid powder fuel directly sprayed into a tunnel kiln for firing refractory materials by means of dilute-phase pneumatic conveying. Background technique [0002] Tunnel kiln is generally a long linear tunnel with fixed walls and vaults on both sides and top, and kiln cars run on tracks laid at the bottom. The combustion equipment is installed on both sides of the middle part of the tunnel kiln, which constitutes a fixed high-temperature zone - the firing zone. The high-temperature flue gas generated by combustion flows along the tunnel to the kiln head under the action of the chimney at the front end of the tunnel kiln or the induced draft fan. At the same time, the products entering the kiln are gradually preheated, and this section constitutes the preheating zone of the tunnel kiln. The co...

AI Technical Summary

Problems solved by technology

[0008] At present, the fuel supply of tunnel kilns used in firing refractory materials in China is nothing more than the following types: solid-liquid mixed fuels such as diesel oil or heavy oil, or natural gas, etc., due to the continuous increase in the price of processed products of petroleum and coal in recent years As a result, the proportion of the cost of the above-mentioned fuel in the firing cost of refractory materials has increased significantly

[0009] At present, there is no technology for directly injecting carbon-containing solid powder fuel into tunnel kiln fuel.

Images