Method for treating pulverized coal and pulverized coal product and method for gasifying pulverized coal
A treatment method and technology for pulverized coal, which are applied in the fields of pulverized coal treatment, pulverized coal gasification, and pulverized coal products, can solve the problem of low carbon conversion rate and methane generation, large influence of gasification effect, and relatively large changes in methane generation of pulverized coal. big problem
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[0030] According to a preferred embodiment of the present invention, the pore-enlarging treatment includes contacting the pulverized coal with a cellulose salt solution, followed by heat treatment, so that the pore structure of the pulverized coal is improved, and at the same time, the moisture content in the pulverized coal is increased to reduce the Ash content in powder.
[0031] In the present invention, the conditions of the contact include a temperature of 50-100°C, preferably 60-80°C, and a time of 1-5h, preferably 2-3h.
[0032] Preferably, the concentration of the cellulose salt solution is 0.5-5% by weight, preferably 1-3% by weight, and the weight ratio of the cellulose salt solution to coal powder can be 1:(1.5-4), preferably 1:(2 -3). The inventors of the present invention found in their research that by controlling the concentration of the cellulose salt solution within the above preferred range, the amount of methane generated when the processed pulverized coal...
Embodiment 1
[0088] 1) Prepare a sodium carboxymethyl cellulose solution with a concentration of 2% by weight, put 50 g of Baisu coal powder (the properties of the raw coal powder in Table 1) with a particle diameter of 0.18-0.25 mm into the above sodium carboxymethyl cellulose solution Sodium carboxymethyl cellulose solution and Baisu coal powder weight ratio is 1:2), carried out in a water bath at a temperature of 80°C for 2h, filtered, and then heat-treated in an oven at a temperature of 220°C for 3.5h , and sieve to obtain pretreated coal powder with a particle size of 0.18-0.25mm, and measure the moisture content, ash content and 5-12nm pore size ratio of raw coal powder and pretreated coal powder, and the results are shown in Table 1;
[0089] 2) take by weighing 10.5g potassium hydrogen phthalate, be dissolved in 40mL concentration and be 10% by weight (NH 4 ) 2 CO 3 In the solution, adding KOH to control the pH value of the solution is 10 to obtain a potassium-containing procatal...
Embodiment 2
[0094] 1) Prepare a sodium carboxymethyl cellulose solution with a concentration of 1% by weight, put 50 g of Shengli coal powder (see Table 1 for the properties of raw coal powder) with a particle diameter of 0.18-0.25 mm in the above sodium carboxymethyl cellulose and carry out Dipping (the weight ratio of carboxymethylcellulose sodium solution to Shengli coal powder is 1:2.5), carried out in a water bath at a temperature of 60°C for 3h, filtered, then heat-treated in an oven at a temperature of 150°C for 4h, and sieved to obtain Pretreated coal powder with a particle size of 0.18-0.25mm, and measured the moisture content, ash content and 5-12nm pore size ratio of raw coal powder and pretreated coal powder, the results are shown in Table 1;
[0095] 2) Weigh 4.3g potassium formate, dissolve in 40mL concentration of 12% by weight of NH 4 HCO 3 In the solution, adding KOH to control the pH value of the solution is 11 to obtain a potassium-containing procatalyst solution that ...
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