Method and system for preventing and controlling contamination of heated surface at tail part of slag tapping furnace
A tail heating surface and liquid slag discharge technology, which is applied in the combustion field of pulverized coal boilers, can solve the problem of contamination in the cold slag section, and achieve the effects of reducing the gas phase alkali metal concentration, reducing safety threats, and inhibiting contamination
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specific Embodiment approach 1
[0089] Spray the contamination inhibitor into the cold slag section of the liquid slagging furnace; the contamination inhibitor is a solid powder with an average particle size of less than 50 μm; according to the industrial analysis method of coal, the detection index of the contamination inhibitor meets the following quality Content limit:
[0090] 1) M t ≤15%;
[0091] 2)A ar ≥60%;
[0092] 3) S ar,t ≤1%;
[0093] According to the ash component analysis method of coal, the ash component detection index of the pollution inhibitor satisfies the following mass content limits:
[0094] 1) 40%≤w(SiO 2 )≤80%;
[0095] 2) 15%≤w(Al 2 o 3 )≤50%;
[0096] 3)w(Fe 2 o 3 )≤10%;
[0097] 4)w(Na 2 O)≤2%;
[0098] 5)w(K 2 O)≤3%;
[0099] 6)w(SiO 2 )+w(Al 2 o 3 )+w(TiO 2 )≥75%;
[0100] 7)w(Fe 2 o 3 )+w(CaO)+w(MgO)+w(Na 2 O)+w(K 2 O) ≤ 20%.
[0101] This embodiment is aimed at the liquid slagging furnace that has not been paid attention to in the existing research....
Embodiment approach 1
[0102] Based on the specific implementation mode 1, coal series clay minerals are selected as the pollution inhibitor. According to the industrial analysis method of coal, the selected clay mineral detection indicators need to further meet the following mass content limits:
[0103] 1) M t ≤8%;
[0104] 2)A ar ≥80%;
[0105] 3) S ar,t ≤0.7%;
[0106] According to the coal ash composition analysis method, the ash composition detection index of the selected clay minerals needs to further meet the following mass content limits:
[0107] 1) 55%≤w(SiO 2 )≤80%;
[0108] 2) 15%≤w(Al 2 o 3 )≤35%;
[0109] 3)w(Fe 2 o 3 )≤8%.
[0110] In this embodiment, readily available coal-based clay minerals are selected, the process is easy to implement, and the cost is low and the economy is good. The sedimentary rocks in the geological transition process of coal-measure clay minerals are mainly silicon-aluminum materials, which are geological rock formations commonly found in large ...
specific Embodiment approach 3
[0111] Based on the specific implementation mode 1, kaolin, bentonite or ceramic clay is selected as the pollution inhibitor, and according to the industrial analysis method of coal, the detection index of the selected pollution inhibitor needs to further meet the following mass content limits:
[0112] 1) M t ≤6%;
[0113] 2)A ar ≥85%;
[0114] 3) S ar,t ≤0.5%;
[0115] According to the coal ash composition analysis method, the ash composition detection index of the selected pollution inhibitor meets the following mass content limits:
[0116] 1) 40%≤w(SiO 2 )≤60%;
[0117] 2) 25%≤w(Al 2 o 3 )≤50%;
[0118] 3)w(Fe 2 o 3 )≤5%.
[0119] Under this embodiment, the selected kaolin or bentonite or pottery clay are common cheap minerals with excellent composition. After dehydration or heat treatment, they have a strong adsorption effect on alkali / alkaline earth metal gas phase compounds such as Na and K, so that they can significantly Contamination of the heated surfac...
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