Clean coal technology

CLEAN COAL TECHNOLOGY

The purpose of the research mainly to develop clean coal technologies for effective use of the Thai lignite as well as to assist the development of human resources in the field of coal conversion technology in Thailand through the exchanges of researchers and students between the two countries.

In the first FY, the group conducting a survey on the current situations of the Mae Moh coal mine and the adjacent coal-fired power plant, the purpose

is to sort out the issues we are facing. The result is increasing the effectiveness prior to power generation.  Secondly, we examined the upgrading behavior of Thai lignite using the upgrading method developed by the group.  Recent progress of coal gasification technologies such as IGCC (Integrated Gasification Combined Cycle) and IGFC (Integrated Coal Gasification Fuel Cell Combined Cycle), has raised expectations to enhance the efficiency of power generation to a great extent.  Therefore it is very important to evaluate the gasification characteristics of Thai lignite in gasification process.  Thirdly, we investigated the gasification behavior of Thai lignite under high pressure and high temperature, which is a typical operating condition of the gasification processes.

The method for upgrading the low coal consists of treatment of low rank coal in a non-polar solvent (1-methylnaphthalene) at below  350°C and subsequent filtration of the treated coal at the same temperature.  This degradative extraction method was applied to the Mae Moh coal (MM) and the results were compared with those for an Australian brown coal, Loy Yang coal (LY).  The treatment (extraction) of the coal was performed using a batch reactor at a constant temperature of 350°C.

The method for upgrading the low coal consists of treatment of low rank coal in a non-polar solvent (1-methylnaphthalene) at below 350°C and subsequent filtration of the treated coal at the same temperature.  This degradative extraction method was applied to the Mae Moh coal (MM) and the results were compared with those for an Australian brown coal, Loy Yang coal (LY).  The treatment (extraction) of the coal was performed using a batch reactor at a constant temperature of 350°C.

The Coal gasifiers for Thai lignite are generally operated under high pressure and high temperature.  Therefore, it is important to evaluate the gasification reactivity of coal under such extreme conditions, although such an experiment is generally rather difficult.  Our group constructed a mini direct heating reactor (mini-DHR) that can measure the gasification rate under high pressure of ~ 2 MPa at T = ~ 1200°C.

The economic reserves of Mae Moh basin are about 814 MMt and the Mae Moh mine is the largest open-pit mine in Southeast Asia.  Mining operation started in 1955, and production rate of lignite is currently about 16 – 17 MMt with the removed overburden of about 70 – 80 million cubic meters a year.  The Mae Moh coal contains as much as 32.4% of moisture on as-received coal basis and as much as 32.3% of ash on dry coal basis, both leading to the significantly low heating value of the coal.  Low carbon and high oxygen contents of the lignite also contribute to the low heating value of the coal.  Since the low heating value of coal causes a low efficiency in power generation, it is important to increase the heating value by efficient dewatering, dashing and upgrading of the coal.

Advertisements
  • calendar

    July 2018
    M T W T F S S
    « Jan    
     1
    2345678
    9101112131415
    16171819202122
    23242526272829
    3031  
  • Enter your email address to subscribe to low carbon energy system in Thailand and receive notifications of new posts by email.

    Join 3 other followers

%d bloggers like this: