Flue gas waste heat recovery system based on heat absorption: the absorption heat exchanger concept will be applied to flue gas heat recovery boiler engineering company in singapore of the gas, the process shown in Figure 1. In additional gas absorption heat pump with the boiler flue gas condensation heat exchanger, an absorption heat pump with natural gas as a drive power source, to generate cold medium, the cooling medium in the flue gas in the flue gas condensing heat exchanger, heat transfer process can be direct contact heat exchanger or an indirect heat exchanger, the exhaust gas temperature of the system dropped below the dew point, condensation of water vapor in the flue gas heat, flue gas heat recovery purposes and moisture. Backwater into the heating network is first heated by the absorption heat pump and then into a gas boiler after heating to a temperature designed to give out, completion of the heating process water heating network. Exhaust gas boiler into the bottom of the chimney, the draft fan is placed on top of flue gas condensation heat exchanger is withdrawn after mixing with the exhaust fumes into the absorption heat pump condensing heat exchanger, the exhaust system temperature is reduced to 30 ℃ vented to the atmosphere into the chimney after less. Out of the chimney flue gas between flue gas and returned to port additional partitions. Our experimental system using a direct contact heat exchanger flue gas condensation. With this technique enables efficient heating system (system for use with a low ratio of heat input into the system of a gas heat) increased by more than l0%. Currently the technology has been applied in Beijing GLD waste heat recovery boiler room engineering, Beijing bamboo plant waste heat recovery boiler project, achieved good energy saving effect. This incremental investment techniques (including absorption heat pump investment, flue gas condensation heat exchanger and related pumps, valves and other equipment) can be recovered usually within 3a.
Fast boiler manufacturers of low-nitrogen condensing pressure hot water boiler, PLC control system design autonomous edited, real-time dynamic control operation of the boiler.
First, the extra transpiration, transpiration companies choose how much additional amount should be based on the enterprise's own demand. For example, small companies need a large amount of steam was selected additional transpiration steam boiler, producing steam out of the foundation used up, it can only be a waste of money. For a large amount of steam was selected transpiration of small boilers, eventually forming steam for less than demand, it can only increase the choice of boiler or a new boiler, so eventually the cost much higher than a place to directly select the appropriate boiler.
Recently, Hangzhou Provincial People's Government for the quality of atmospheric environment issues issued a deadline for compliance plan, as follows.
First, the situation and challenges
Since the "Atmospheric ten" implementation of Hangzhou to build an ecological civilization as a guide to improve the quality of atmospheric environment as the goal, carry out air pollution prevention and control actions to protect the G20 summit in Hangzhou as an opportunity to promote a strong "coal-fired flue gas, industrial emissions , vehicle exhaust, dust gray gas, urban and rural exhaust "other" gas cohabitation ", strengthen regional joint prevention and control, air pollution control and achieved remarkable results, no built coal-fired thermal power, iron and steel producers no, no emission vehicles "three noes" urban atmospheric environmental quality continues to improve.
(A) Key Performance
1, ambient air quality improved significantly.
In the case of the national economy with an average annual growth of 9.1% of the "second five" major pollutants emission reduction achieved remarkable, sulfur dioxide, total nitrogen oxide emissions compared to 2010, respectively, decreased by 21.9%, 26.5%, exceeding the state-assigned the reduction targets and tasks.
2, energy and industrial structure gradually optimized.
The city's total energy consumption growth narrowed year by year, total energy consumption in 2015 was 39.48 million tons of standard coal, an average annual increase of "Twelfth Five-Year" period is only 3.4%, compared with the "Eleventh Five-Year" down 2.1 percentage points.
3, industrial pollution prevention deepened.
Promoting desulfurization and denitrification and dust removal facilities, coal-fired thermal power generating units are completed desulfurization, denitrification facilities, a total of 87 coal-fired thermal power generating units ultra-low emissions transformation.
4. The motor vehicle exhaust pollution prevention and continuous progress.
"Twelve Five" period, and comprehensively promote the yellow car out of work in 2015, the city basically eliminated emission vehicles.
5, comprehensively promote urban and rural waste gas treatment.
"Twelve Five" period, to strengthen the construction site dust management, the establishment of civilized city construction sites and construction dust pollution comprehensive rectification work leading group, the establishment of municipal, district, enterprise level management network.
6, continue to strengthen capacity building.
"Twelve Five" period, the construction of Hangzhou, air pollution control system for continuous improvement, introduced the "Hangzhou pollution prevention provisions of the atmosphere", and the issuance of the annual air pollution control plan and supporting the implementation of assessment methods.
(B) there is a problem
1, ambient air quality improvement into the bottleneck.
In recent years, the effectiveness of atmospheric environmental quality improved significantly, but control "Ambient Air Quality Standard" (GB3095-2012) secondary standards are still gaps.
2. Regional collaborative governance is still run-in period.
The analysis results Hangzhou PM2.5 sources, the contribution to the local discharge air in an urban environment PM2.5 concentration 62% -82%, about 72% on average. Regional transport to urban ambient air concentrations of PM2.5 contribution accounts for 18% -38%, an average of about 28%, in different seasons affect the Hangzhou area varies. A higher proportion of regional transport and complexity of the transmission source region to control air pollution in Hangzhou more difficult to establish and improve regional air pollution is critical institutional mechanisms of joint prevention and control.
3, into the deep water of air pollution control.
In recent years, Hangzhou, air pollution prevention and control work has achieved remarkable success, but there are still many "shortcomings" in the current governance of air pollution, structural, further highlights the deep-seated problems.
(1) optimize the industrial structure needs to continue, heavy pollution in some areas, high energy-consuming industries and the "messy dirty" business issues are still quite prominent.
Total coal (2) Energy consumption is still high, the use of natural gas supply capacity and scale need to be strengthened, industrial parks (industrial parks) are still blind spots of central heating, renewable energy development and utilization efforts still need to increase.
(3) heavy end of the treatment, the light source control and cleaner production, the work of "second five" major emission control measures revolve around the end of pollutants on source control and cleaner production process is still insufficient attention.
(4) With SO2, NOx reduction work continued in-depth, project emissions space shrinking, VOCs emissions is more a lack of technical means, the rigidity of the vehicle population growth, vehicles, ships and non-road mobile machinery and other mobile source pollution control to be a breakthrough. With the difficulty of the work of prevention and control of atmospheric pollution key areas continue to increase, the city is still on air pollution control into the deep water.
4, the basic work is still weak period.
Municipal government attaches great importance to air pollution control work, work-related basis more solid, but there are still many weak links. Hangzhou, organization and leadership of atmospheric pollution control systems should be strengthened, the department division of labor, the working mechanism of collaborative governance needs improvement. Local standards should be further improved, pollution resources and a list of atmospheric pollution still need to be updated regularly.