Tower-type powdered coal pressure gasification device with chilling process

Abstract

The invention discloses a tower-type powdered coal pressure gasification device with a chilling process. The device comprises a pressure shell, and a gasification unit and a steam / water or dust-free gas chilling unit which are hung in the pressure shell. The device is characterized in that the gasification unit is arranged below the steam / water or dust-free gas chilling unit coaxially; the gasification unit comprises a reaction chamber and four nozzles arranged near the bottom of the reaction chamber at interval; the device of the invention also comprises a cooling channel and a returning chamber which are in coaxial arrangement with the gasification unit or the steam / water or dust-free gas chilling unit, and a chilling chamber and a slag pool; the cooling channel is arranged above the steam / water or dust-free gas chilling unit; the returning chamber is arranged on the top of the cooling channel; the chilling chamber is arranged around the cooling channel; the slag pool is arranged below the gasification unit; and the pressure shell is provided with a synthesis gas outlet, a grey water exhaust port and a slag-discharging hole. By using the device of the invention, dust and slag generated by gasification can be effectively separated and processed and the problem of performing thermal compensation to the entire equipment is effectively solved.

Description

technical field [0001] The invention relates to a device for preparing syngas by pressurized gasification of dry coal powder, specifically a high-temperature syngas produced by performing partial gasification reaction of dry coal powder, oxygen and water vapor in a high-pressure and high-temperature environment A tower-type pulverized coal pressurized gasification belt quenching process device that adopts chilling mode to cool down and remove dust. Background technique [0002] Coal gasification technology is the basis for the development of coal-based chemicals, coal-based liquid fuels, combined cycle power generation, hydrogen production and other process industries, and is the key technology, common technology and leading technology of these industries. [0003] The existing dry pulverized coal gasifiers are divided into two types according to the cooling method of the high-temperature synthesis gas: the waste boiler process and the quenching process. The dry pulverized ...

AI Technical Summary

Problems solved by technology

But its main disadvantages are: 1. The coal-water slurry contains 40% water, which reduces the calorific value of raw materials; 2. The restrictions on raw coal are relatively strict, such as poor slurryability, high ash content, and coal with high ash melting point. Use; 3. The gasification efficiency and carbon conversion rate are lower than those of dry pulverized coal gasification, and the specific oxygen consumption is higher; 4. The furnace wall is made of shaped refractory bricks, and the service life is shorter

5. The mixed treatment of ash and slag greatly increases the difficulty of ash water treatment, which is not conducive to the long-term operation of the entire gasification device

However, the dry coal pulverized waste gasification process has the following disadvantages: 1. The equipment cost is high and the manufacturing cycle is long. This is mainly because the synthesis gas cooler has a large structure and is connected with the reaction chamber by a 45° cooling channel. Its manufacturing and The installation is relatively complicated; 2. The syngas compressor for chilling consumes a lot of power; 3. The high-temperature ceramic filter and dust removal device is easy to break, and the cost is expensive

Therefore, the process is not suitable for chemical process

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