Abstract
This study focuses on establishing a cost-benefit evaluation model of low NOx combustion technology and the environmental benefits and economic benefits evaluation of technology operation were carried out as well. Results showed that: (1) The operation cost per unit calorific supply of the low NOx combustor with larger capacity (14 MW) boilers was 1.5-2.1 yuan/GJ, which was 22.3% to 26.2% as much as that of boilers with smaller capacity (0.7 MW). Compared with scattered boilers with smaller capacity, it is more economical to use boilers with larger capacity for centralized heating. (2) The lower the NOx emission concentration was, the greater the NOx emission reduction was. Furthermore, the lower the NOx emission benefits of low NOx combustor per unit calorific supply was, the greater the economic benefit of NOx reduction per unit calorific supply was. Based on the environmental and economic benefits analysis, the lean premixed combustor is recommended for natural gas boilers with capacity of 7 MW and below, and flue gas recirculation combustor (FGR-30) could be selected for natural gas boilers with capacity above 7 MW to achieve the NOx retrofits requirements of 30 mg/m3 or 80 mg/m3.
Highlights
This study focuses on establishing a cost-benefit evaluation model of low NOx combustion technology and the environmental benefits and economic benefits evaluation of technology operation were carried out as well
To implement the "clean air economic evaluation model of boiler capacity and action plan" and continue to improve the atmospheric denitrification efficiency by taking SCR and advanced environmental quality, Beijing introduced a "boiler air reburning denitrification technologies as evaluation pollutant emission standard" (DB11/139-2015) on July 1th, 2015, in which the NOx emission concentration was restricted below 80 mg/m3, and that of new boiler was below 30 mg/m3 [9]
The material consumption cost will change as the operation time, NOx emission concentration and other influencing factors, which is entitled to variable cost
Summary
Depreciation cost, maintenance cost and labor cost of low nitrogen combustor, the boilers with specific capacity and specific operating conditions are fixed, so it is called fixed cost. The material consumption cost is related to the low nitrogen combustor, boiler capacity, NOx emission concentration, boiler load and the annual utilization hours. ܶܥܣ௧(q, c, η, h) = ܦ௧(q, c) + ܯ௧(q, c) + ܮ௧, + ܥ௧ (5) where ܦ௧(ݍ, ܿ) denotes the depreciation cost of low nitrogen combustor. ܶܥܫ௧(ݍ, ܿ) denotes the equipment investment cost of low nitrogen combustor. ܥ௧ denotes the consumed material cost of low nitrogen combustor in operation. ܯ௧(ݍ, ܿ) denotes the maintenance cost of low nitrogen combustor. ܮ௧, denotes the labor cost of low nitrogen combustor operating in area R. ܶܥܣ௧(q, c, η, h) represents the annual operating cost of low nitrogen combustor ܯ௧(ݍ, ܿ) denotes the maintenance cost of low nitrogen combustor. ε is the ratio of maintenance cost to investment cost. ܮ௧, denotes the labor cost of low nitrogen combustor operating in area R. ݉௧denotes the operation and maintenance manual people number of low nitrogen combustion equipment. ܹ denotes the annual salary of workers. ∑ଵ ܥ ܯ,(ݍ, ܿ, ߟ, h) denotes the consumption of material K. ܲ, denotes the price of consumed material K. h denotes the annual operating hour of the boiler. ߟ denotes the boiler operating load. ܶܥܣ௧(q, c, η, h) represents the annual operating cost of low nitrogen combustor
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