Boiler suitable for denitration device negative whole process load operation
A technology for equipment and boilers, which is applied in the direction of lighting and heating equipment, etc., can solve the problems of inability to remove NOx, inability to work, and increased loss of boiler exhaust smoke, and achieve the effect of increasing the difficulty of design
Active Publication Date: 2013-02-20
SHANGHAI BOILER WORKS
View PDF8 Cites 14 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, as the load decreases, the temperature of the flue gas passing through the SCR equipment also decreases. If it is lower than a certain temperature (such as 315°C, see the SCR equipment for specific requirements), the catalyst in the SCR equipment cannot work, so it cannot play a role. The role of deNOx
If it is ensured that the temperature of the flue gas entering the SCR device meets the reaction temperature of the catalyst at full load, the temperature of the flue gas entering the SCR device at full load is much higher than the conventional value. Also, because the flue gas passes through the SCR device, there is basically no significant temperature drop. Such a high flue gas temperature entering the air preheater can not use the material of the original air preheater, and the second is that only through the air preheater can not meet the requirements of the conventional exhaust gas temperature, resulting in an increase in the exhaust gas loss of the boiler
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to the following examples.
[0020] figure 1 It is a schematic diagram of the layout of a conventional π boiler with SCR equipment. The economizer is arranged in the tail flue of the boiler as the last heating surface of the boiler body; the SCR equipment 2 is arranged in front of the air preheater 3, the boiler body and the SCR equipment are connected through the flue 4, and the SCR equipment 2 is preheated with the air Device 3 is connected through the flue. The flue gas after boiler combustion passes through other heating surfaces of the boiler body, first passes through the economizer, and then enters the SCR equipment 2 through the flue 4 connected to the SCR equipment, and then the flue gas enters through the air preheater inlet flue 5 Air preheater 3.
[0021] figure 2 It is a schemat...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a boiler suitable for denitration device negative whole process load operation. The boiler is characterized in that an economizer, a selective catalytic reduction (SCR) device (2) and an air pre-heater (3) are distributed in a flue, the economizer is divided into a front stage economizer (1) and a rear stage economizer (6) in terms of the flue gas side, and after the flue gas generated by boiler combustion passes through other heating surfaces of a boiler body, the flue gas firstly passes through the front stage economizer and the rear stage economizer, then enters into the SCR device (2) through a flue (4) connected with the SCR device and finally enters into the air pre-heater (3) through a air pre-heater entrance flue (5). By means of the boiler, the temperature of the flue gas entering into the SCR device is always higher than the reaction temperature required by the catalyst under all loads.
Description
technical field [0001] The invention relates to the field of boiler equipment, in particular to a boiler suitable for denitrification equipment to be put into operation with full load. Background technique [0002] As the country pays more and more attention to environmental protection, in order to ensure the final NOx emission target, denitrification equipment has become one of the standard configurations of boilers in the future while using low NOx combustion equipment. In the conventional boiler design, if SCR (Selective Catalytic Reduction) denitrification method is adopted, the denitrification device is usually arranged at the outlet of the boiler heating surface and the inlet of the air preheater. However, in order to ensure that the boiler can achieve higher efficiency at the same time, the flue gas temperature of the air preheater is usually around 350~400°C at full load, and the flue gas temperature can meet the operation requirements of SCR equipment under high loa...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/00
Inventor 诸育枫姚丹花
Owner SHANGHAI BOILER WORKS