The co-combustion of biomass and biochar was investigated by thermogravimetric analysis. Several thermal parameters and mean reactivity index (R
 M) for different blends were used to evaluate co-combustion features. As the biomass content increased from 30 to 90 mass%, volatile releasing temperature (T
 v), burnout temperature (T
 b), and the temperature at the maximal peak (T
 max) generally reduced, while average mass loss rates (R
 a) and R
 M increased, the maximum mass loss rate (R
 max) initially decreased and then increased. Results showed that biochar additions enhanced biomass fuel reactivity over weighted average in main combustion region. Besides, blends with 10–30 mass% of biochar behaved better than those with higher biochar ratio. Synergy exists between the two components and better combustibility is feasible by co-firing biochar with biomass.

Thermogravimetric analysis of co-combustion of biomass and biochar

Effect of potassium-doping and oxygen concentration on soot oxidation in O2/CO2 atmosphere: A kinetics study by thermogravimetric analysis

Thermogravimetric analysis of the behavior of sub-bituminous coal and cellulosic ethanol residue during co-combustion.

Synergistic effects of biomass and polyurethane co-pyrolysis on the yield, reactivity, and heating value of biochar at high temperatures

Oxy-combustion of corn, sunflower, rape and microalgae bioresidues and their blends from the perspective of thermogravimetric analysis.

The combustion kinetics of waste capsicum stalk (WCS) in Western China is investigated through thermogravimetric analysis compared with sawdust and coal, and co-combustion of WCS with coal is also investigated. Results show that the ignition characteristics of WCS is better than that of sawdust and coal, and the activation energy E of WCS-volatile combustion and WCS-char combustion are 78.55 kJ mol−1 and 44.59 kJ mol−1. However, integrating the characteristics of ignition and burnout, the combustion characteristic factor (S
 N) of WCS is lower than that of sawdust. With the increasing in the heating rate, the ignition of WCS is delayed. Oxygen concentration $$ C_{{{\text{O}}_{2} }} $$
 affects E and k
 0 of volatile combustion largely under rich-oxygen condition, when $$ C_{{{\text{O}}_{2} }} $$
 increases from 0.2 to 0.8, E has increased threefold and k
 0 also intensively increases from 106 to 1013–1022. Oppositely, effect of $$ C_{{{\text{O}}_{2} }} $$
 on the E and k
 0 of char combustion is little, and there is an exponential relationship $$ S_{\text{N}} = 7. 1 2 8 \times 10^{ - 9} \times { \exp }(C_{{{\text{O}}_{2} }} /0. 3 6 8) - 6. 1 2 6 \times 10^{ - 9} $$
 between S
 N and $$ C_{{{\text{O}}_{2} }} $$
 . For the tests of co-combustion, all the experimental and weighted-average curves coincide well, and there is no remarkable synergistic effect. With the increase of mixing ratio that WCS added, E and k
 0 of volatile combustion increase, but correspondingly E and k
 0 of char combustion decrease.

Kinetics investigation on the combustion of waste capsicum stalks in Western China using thermogravimetric analysis

A Copula-based interval linear programming model for water resources allocation under uncertainty.

A smoke water condensing and waste heat recovering device is provided A propene polymer (PP) (or polytetrafluoroethylene (PTFE)) heat exchanger is arranged at the top of a desulfurizer or in a smoke duct of the desulfurizer to aim at solving the problems that smoke temperature at a desulfuration outlet is generally from 50 DEG C to 60 DEG C, and low temperature corrosion exists After smoke flows by the heat exchanger to be cooled, water steam in the smoke condenses, and is recovered and sent back to a desulfuration system; heat released by the smoke and vaporized latent heat released by the steam are used by a heat pump to continuously increase temperature and supply heating The smoke water condensing and waste heat recovering device aims at solving the problem of low temperature corrosion of the tail smoke of desulfuration, adopts the heat exchanger made of corrosion-resistant materials, recovers waste heat and smoke condensate water, and has a positive effect for energy saving and consumption reduction of a power plant

Smoke water condensing and waste heat recovering device

The invention discloses a system and a method for recycling water vapor and heat in desulfurization tail smoke. A heat exchanger is arranged on the top of a desulfurization tower and is of a two-stage or three-stage form, smoke is cooled by flowing through the heat exchanger, and water vapor in the smoke is condensed, and recycled to a desulfurization system; and heat released from the smoke and vaporization latent heat released from water vapor are utilized or subjected to heat radiation through a cooling tower. The system and the method play an active pole in saving water of a power plant, especially a power plant combusting lignite, and can reach the requirement of zero water replenishing for desulfurization, i.e., in the power plant in a drought region, a wet process desulfurization can be adopted, and the cost is greatly lowered compared with that of the dry process desulfurization; and the heat of the smoke and the vaporization latent heat of the water vapor are all recycled, and if the recycled heat is equal to a generated power, the coal consumption can be lowered by about 30g/kw.h.

Chao Xu

Papers

Kinetics investigation on the combustion of waste capsicum stalks in Western China using thermogravimetric analysis

A Copula-based interval linear programming model for water resources allocation under uncertainty.

Smoke water condensing and waste heat recovering device

System and method for recycling water vapor and heat in desulfurization tail smoke

How to obtain industrial waste data at the county scale: Two downscaling models and their application in Dongguan, China