Where can I analyze the reasons for mixing sludge into the boiler fuel?

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1. General information on the equipment:
1. Model: JG-110/5.3-M type boiler with differential speed between high and low pressure sections
2. Manufacturer: Jiangxi Jianglian Energy Environmental Protection Co., Ltd.
3. Date of manufacture: December 2009
4. Date of installation: June–December 2010
5. Date of commissioning:
6. Installation company: The Second Engineering Company of Northeast Electric Power Administration

2. Main parameters
Symbol | Unit | Value
--- | --- | ---
2.1 Rated evaporation capacity: D, t/h | 110
2.2 Rated steam pressure: P, Mpa | 5.3
2.3 Rated steam temperature: t, °C | 480
2.4 Designed feedwater temperature: tgS, °C | 150
2.5 Preheating temperature of primary and secondary air: Tc, °C | 150
2.6 Designed flue gas temperature: tpy, °C | 150
2.7 Designed thermal efficiency: η, % | 84.1
2.8 Cold air temperature: t, °C | 20
2.9 Particle size of desulfurization agent: mm | 0–22
2.10 Desulfurization efficiency: % | 2
2.11 Boiler blowdown rate: % | 2
2.12 Coal particle size: mm | 0–8
2.13 Designed calorific value of coal (lower heating value): Kj/kg | 11502
2.14 Calculated fuel consumption: kg/h |

The current specifications for the coal fed into this boiler are as follows:
(1) Calorific value: Lower heating value of 3800–4200 kcal/kg
(2) Sulfur content: ≤2.3%
(3) Ash content: 35–45%
(4) Volatile matter content: 12–20%
(5) Coking characteristic: ≤4
(6) Moisture content: ≤8%
(7) Particle size distribution: 40–50%
(8) Nitrogen content: ≤0.8%
(9) No excessive gangue or impurities in the coal.

Currently, the coal consumption is approximately 23 tons per hour, with a maximum amount of 3.75 tons per hour of sludge being mixed in with the coal (the amount of sludge used can vary greatly; if production conditions are poor, no sludge may be added at all). Our company is a papermaking and pulping enterprise, and the sludge it produces is mainly sludge resulting from the treatment of wastewater generated by papermaking and pulping industries. The produced sludge is divided into biological sludge and chemical sludge, with a dryness content of around 50% in both cases. Currently, biological sludge is mainly used as a blending material, while chemical sludge is hardly used at all. From the perspective of co-firing, coking occurs easily when chemical sludge is used for co-firing, and coking has also happened when biological sludge is used. Due to coking, it has severely affected the amount of sludge we can use in combustion. We would like to analyze the reasons for coking when sludge is blended in the combustion process now The main goal is to analyze which elements in the sludge are responsible for its coking Is it possible to conduct such analysis at that place?