Catalytic flue gas residual boiler
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Let’s discuss: what is the steam pressure generated by the catalytic flue gas waste heat boiler in your facility, and where is this steam used?
We increase the steam pressure generated by the flue gas waste heat boiler to over 0.9 MP, which is used specifically for atomizing steam with nozzles, in order to prevent fluctuations in the overall steam network pressure from affecting the atomization process
The remaining boiler generally produces 3.5MPA steam, which is used internally as well as fed into the plant’s medium-pressure steam network. It can also pass through a pipeline network at nearly 1.0 MPA via a temperature and pressure reducer.
Is it because an overheating section has been added that only superheated steam is produced? Can a device with a capacity of 150,000 produce 35 kilograms of steam?
1.0-3.5 Mpa, integrated into the plant’s steam network, used for purging and fluidizing certain pipelines as well as protecting joints. .
The steam pressure generated by the unit’s catalytic flue gas waste heat boiler is 3.5 Mpa; this steam is superheated in the regenerator before being integrated into the plant’s steam network
The steam pressure generated by the 500,000-ton catalytic flue gas waste heat boiler is 3.8 Mpa; after being superheated in the regenerator, it is fed into the plant’s medium-pressure steam network. The excess steam, after passing through a temperature reduction and pressure reducing device, enters the low-pressure (1.0 MPa) steam network.
Our pressure is 0.8 Mpa, integrated into the system pipeline network.
We generate superheated steam at 1.0 MPa, which is then **cooled to 270°C before being fed into the plant’s steam network**.
1.4 million units are being urgently requested to generate 3.5 MPA steam for compressors, with the excess steam fed into the medium-pressure steam network. A portion goes into the 1.0MPA pipeline network.
Our remaining boilers produce sub-high-pressure steam at around 6.2 MPa; after passing through temperature and pressure reducers, this steam is converted into medium-pressure steam at 3.5 MPa. Some of this steam is used by the compressors and the turbines in Unit 4, while the rest is fed into the medium-pressure pipeline network outside the facility. After being used by the compressor and the four-unit steam turbine, the medium-pressure steam enters the 1.0 MPa steam pipeline network; part of it is used by this facility, while the rest leaves the facility and enters the 1.0 MPa pipeline network.
The residual boiler on the 11th floor facilitates energy recovery and cascaded utilization. It means that high requirements are placed on the grade of related equipment. Our unit’s residual boiler generates medium-pressure steam at 1.5 MPa. After temperature and pressure reduction, it is combined with the 1.3 MPa system.
I have another question: How do you reduce pressure and temperature? And to what medium is all the heat transferred?
The newly designed catalytic units generally produce medium-pressure steam at 3.5 Mpa. Apart from being used to drive the turbines of the compressors, this medium-pressure steam is usually reduced to low-pressure steam at 1.0 Mpa through temperature and pressure reducers and sent to the low-pressure steam network. Temperature reduction is achieved by injecting demineralized water in front of the pressure reduction control valve, while pressure reduction is accomplished through the pressure reduction control valve itself. Temperature reduction is intended to control the superheat of the steam in the 1.0 Mpa low-pressure steam network, preventing it from exceeding an excessive level.
The turbine generates 3.5 MPA of steam for the compressors, with most of the excess steam being fed into the medium-pressure steam network
The current device focuses on the optimized design of the heat exchange process, aiming to make full use of waste heat and reduce the overall energy consumption of the system. By reading Haiyou’s comments, I learned a lot
Our unit produces 3.5MPa steam, which, together with the 3.5MPa steam from external networks or gas boilers within the facility, is fed into the compressor; the remaining steam is incorporated into the medium-pressure steam network, or it can also be sent to the 1.0MPa network via a temperature and pressure reducer.
The residual heat boilers here produce steam at 3.5 MPa; typically, such boilers also have a superheating section for superheating other medium-pressure saturated steam
Our plants produce medium-pressure steam at 3.8 Mpa, which is first used to power the turbines; then most of this steam is fed into the medium-pressure steam network, while a small portion passes through a temperature and pressure reducer before entering the 1.0 Mpa steam network； Generally, units with a capacity of over 500,000 tons require boilers that can produce medium-pressure steam, while smaller-scale units usually only generate low-pressure steam. The boiler in our first catalytic unit produces low-pressure steam, whereas those in the second and third catalytic units produce medium-pressure steam. At present, all the medium- and low-pressure steam needed across the facility can be supplied by our catalytic units; currently, the boiler room has only one boiler operating under load, as a precaution in case of emergencies.
It generates medium-pressure steam, which is superheated and then fed into the pipeline network, under the control of the boiler crew.