Purification and Utilization System and Technology of Gas Equalization and Release in Blast Furnace Top Tank

Abstract

The invention discloses a system and a process for purifying and utilizing an equalized diffuse gas of a blast furnace top charging bucket. The system and the process are mainly designed aiming at insufficient recycling of a diffuse gas in the prior art. The system for purifying and utilizing the equalized diffuse gas of the blast furnace top charging bucket comprises a purifying device, a pressurizing device and an equalizing device, wherein the pressurizing device is connected with the purifying device; the purifying device comprises a cyclone dust collector and a bag-type dust collector, which are connected with the charging bucket; the pressurizing device comprises a gas pressurizing device and a gas storage tank; and the equalizing device comprises a nitrogen inlet which is connected with the charging bucket. The process for purifying and utilizing the equalized diffuse gas of the blast furnace top charging bucket disclosed by the invention at least comprises a purifying process of the diffuse gas, a pressurizing process of the diffuse gas, and an equalizing process of the diffuse gas. The system and the process for purifying and utilizing the equalized diffuse gas of the blast furnace top charging bucket are capable of fully recycling the diffuse gas, zero discharge of the diffuse gas and fly ash is achieved, and the recycling efficiency is high.

Description

technical field [0001] The invention relates to a system and process for purifying and utilizing coal gas from pressure-equalized and diffused gas in a top material tank of a blast furnace. Background technique [0002] The pressure equalization and release of the top material tank of the blast furnace basically adopts two equalizations, one of which uses clean coal gas, and the second equalization uses nitrogen. For large-scale blast furnaces, the pressure-equalized and vented gas is usually discharged directly after preliminary dust removal. For small and medium-sized blast furnaces, most of the pressure-balanced vented gas is directly discharged without dust removal. This traditional gas release method not only causes energy loss, but also causes environmental pollution. [0003] With the popularization of the bellless furnace top, the pressure of the furnace top is getting higher and higher (0.15-0.3MPa), the amount of gas stored in the furnace top material tank becomes...

AI Technical Summary

Problems solved by technology

One is to purify the released gas first, and then directly transport the purified gas to the gas pipe network. The disadvantage of this method is that after the pressure of the material tank is balanced with the pressure of the gas pipe network, there is still a small amount of residual gas in the material tank. In the end, some gas needs to be vented; another method uses high-pressure nitrogen to inject, so that all the gas in the material tank can enter the gas pipe network, but the disadvantage of this method is that the input of nitrogen dilutes the gas composition and reduces the heat of the gas. value, which reduces the value of recovered gas, and at the same time, consumes a large amount of nitrogen; there is also a self-circulation transfer method for purifying gas. The disadvantage of this method is that in the self-circulation transfer system, the amount of residual gas in the tank is relatively large Large, there is still a large amount of gas and there is a problem of external release

Therefore, the above-mentioned methods only emphasize the release, purification and recovery of pressure-equalized gas, but no better solution is proposed for the treatment of purified gas dust removal.

Images