[0031] Example 1
[0032] A high-temperature, ultra-high pressure reheating waste heat power generation method, such figure 1 As shown, including the following steps:
[0033] S1: Use the induced draft fan to send the 1000-1170℃ rising pipe high temperature flue gas generated during the production process of the coke production line to the high temperature and ultra-high pressure reheat waste heat boiler through the gas gathering pipe for heat exchange to produce 13.7MPa, 540℃ high temperature and ultra high pressure steam ;
[0034] S2: The 13.7MPa, 540℃ high-temperature and ultra-high pressure steam produced by the reheat waste heat boiler drives the operation of the pure condensing turbine, while the 0.4MPa, 152℃ low-pressure steam produced by the boiler is used for the deaerator of the waste heat boiler to deoxidize;
[0035] S3: The 2.9MPa and 350℃ steam produced by the high temperature and ultra-high pressure steam in the pure condensing turbine is sent to the boiler for reheating. After the temperature reaches 540℃, it is sent back to the pure condensing turbine for secondary steam inlet reheating. acting;
[0036] S4: The 170℃ low-temperature flue gas after heat exchange is discharged to the desulfurization device through the flue for desulfurization, and it is discharged after the desulfurization treatment is qualified.
[0037] It is worth noting that the high-temperature and ultra-high pressure reheat waste heat boiler of this embodiment adopts the Hangzhou Boiler 60t/h or 65t/h type high temperature and ultra-high pressure reheat waste heat boiler, and the steam turbine in the steam turbine unit adopts the N65 produced by Dongfang Steam Turbine Co., Ltd. -13.2/538/538, N80-13.2/535/535 type steam turbines, QF-70-2-10.5, QF-80-2-10.5 type generators used in the generator set.
[0038] The high-temperature and ultra-high pressure reheating waste heat power generation method of the present invention adopts high-temperature and ultra-high pressure reheating waste heat power generation technology to replace the existing 3.82MPa, 450°C medium temperature and medium pressure waste heat power generation technology, and the steam consumption rate of power generation is about 3kg/kWh, which makes the system energy use The efficiency is increased by more than 30%. The furnace structure and component configuration of the high-temperature and ultra-high-pressure reheat waste heat boiler are reasonable. The use of high-efficiency heat transfer components and the installation of steam reheating devices can effectively improve the energy efficiency of the system. The intermediate stage of the steam turbine can be Part of the medium pressure steam is extracted for reheating and then returned to the steam turbine for work, which can effectively improve the thermal cycle efficiency of the system, and at the same time improve the steam turbine exhaust dryness and reduce the erosion of the final stage blades. It has high power, high efficiency, low price, and operation The advantages of low cost; the generator set has the advantages of high power generation efficiency, strong current carrying capacity, stable operation and good sealing.
[0039] On the other hand, the present invention also provides a high-temperature and ultra-high-pressure reheating waste heat power generation device, including a coke oven tail gas discharge pipe, a steam turbine set and a generator set, the steam turbine set is connected to the generator set, and the coke oven tail gas discharge pipe is provided with a riser pipe and an induced draft fan , High temperature superheater, reheater, low temperature superheater, convection tube bundle, high temperature evaporator and economizer, the output end of the high temperature superheater is connected with a desuperheater, and the output end of the high temperature superheater is connected to the input end of the steam turbine unit, and the steam turbine The output end of the group is connected to the input end of the reheater, and the output end of the reheater is connected to the input end of the steam turbine unit.
[0040] Such as figure 2 As shown, the high-temperature superheater includes a high-temperature evaporating box 1, the bottom ends of the high-temperature evaporating box 1 are provided with support frames 4, the high-temperature evaporating box 1 has a hollow cylindrical structure, and the top of the high-temperature evaporating box 1 is provided with water in the shape of a hollow truncated cone. The steam discharge head 2, the bottom of the high-temperature evaporating box 1 is provided with a hollow inverted truncated truncated water tank 3, such as image 3 As shown, the inside of the high temperature evaporation box 1 is equipped with a flue tube bundle 11 arranged in an S-shape. The flue tube bundle 11 is provided with a high temperature flue gas inlet 12 and a low temperature flue gas outlet 13, and the side wall of the high temperature evaporation box 1 is provided with several The branch pipes 14 are arranged uniformly and linearly. The branch pipe 14 is connected with a spray head 15. A water pump 31 is installed at the bottom of the water tank 3. The water outlet end of the water pump 31 is connected with a water delivery pipe 32. The end of the branch pipe 14 away from the spray head 15 is connected to the delivery pipe. On the outer wall of the water pipe 32, the branch pipe 14 communicates with the spray head 15.
[0041] In addition, a shock-absorbing base 5 is installed at the bottom of the support frame 4 to improve stability. A water level marking area 36 is provided on the outer wall of the water tank 3 to facilitate the operator to observe the water level.
[0042] In the high-temperature and ultra-high-pressure reheat waste heat power generation device of this embodiment, the high-temperature evaporation box 1 can spray water on the flue tube bundle 11 through the S-shaped flue tube bundle 11 and the multiple branch pipes 14 and the multiple nozzles 15 provided. , Improve the utilization rate of heat, speed up the evaporation of water and increase the generation rate of water vapor; the water storage tank 3 provided at the bottom of the high-temperature evaporation box 1 can recycle the unevaporated or condensed backflow water to save resources.
[0043] In this embodiment, a water filling pipe 34 is provided on one side of the water reservoir 3, a liquid level sensor 33 is installed on the inner side wall of the water reservoir 3, a solenoid valve 35 is installed on the water filling pipe 34, and a control box 6 is installed on the support frame 4. , AT89S52 single-chip microcomputer 61 is installed on the circuit board in the control box 6.
[0044] Such as Figure 4 with Figure 5 As shown, the liquid level sensor 33 is electrically connected to the pin P3.6 of the AT89S52 single-chip microcomputer 61 through a wire, and the AT89S52 single-chip 61 is externally connected to a driving circuit. The driving circuit includes S8050 triode, T1P122 composite tube, 1N4001 diode and solenoid valve 35, and S8050 triode The input end of the S8050 transistor is electrically connected to the pin P0.4 of the AT89S52 microcontroller 61 through a 4.7K resistor, the output end of the S8050 transistor is electrically connected to the input end of the T1P122 composite tube through a 5.1K resistor, and the output ends of the T1P122 composite tube are respectively connected in series There are 1N4001 diodes and 35 solenoid valves.
[0045] It is worth noting that the principle of automatic water addition in this embodiment: water is always added through the water adding pipe 34, the level sensor 33 is used to continuously monitor the water level in the water tank 3, and the collected data is sent to the AT89S52 single-chip computer 61 for processing. Analyzing and processing, AT89S52 single-chip microcomputer 61 processes the collected data. When the water level reaches the position of liquid level sensor 33, it indicates that the water tank 3 is full and water can be stopped. At this time, AT89S52 single-chip microcomputer 31 can control the solenoid valve through the drive circuit 35 45 Close the water adding pipe 34 and stop adding water.
[0046] The water storage tank 3 in the high-temperature and ultra-high pressure reheat waste heat power generation device of this embodiment can automatically add water, which is highly intelligent, and reasonably controls the amount of water added to prevent excessive water addition, resulting in low evaporation efficiency and more water saving and environmental protection.
[0047] In this embodiment, a flange connection plate 21 is provided on the top of the steam discharge head 2 to facilitate connection and disassembly. A suction fan 22 is installed inside the steam discharge head 2 to speed up the discharge of steam.
[0048] The high-temperature and ultra-high pressure reheating waste heat power generation method of the present invention adopts high-temperature and ultra-high pressure reheating waste heat power generation technology to replace the existing 3.82MPa, 450°C medium temperature and medium pressure waste heat power generation technology, and the steam consumption rate of power generation is about 3kg/kWh, which makes the system energy use The efficiency is increased by more than 30%. The furnace structure and component configuration of the high-temperature and ultra-high-pressure reheat waste heat boiler are reasonable. The use of high-efficiency heat transfer components and the installation of steam reheating devices can effectively improve the energy efficiency of the system. The intermediate stage of the steam turbine can be Part of the medium pressure steam is extracted for reheating and then returned to the steam turbine for work, which can effectively improve the thermal cycle efficiency of the system, and at the same time improve the steam turbine exhaust dryness and reduce the erosion of the final stage blades. It has high power, high efficiency, low price, and operation The advantages of low cost; the generator set has the advantages of high power generation efficiency, strong current carrying capacity, stable operation, and good sealing; the high-temperature superheating box 1 is provided with an S-shaped flue tube bundle 11 and a plurality of branch pipes 14 and multiple A nozzle 15 can spray water on the flue tube bundle 11 to improve the utilization rate of heat, speed up the evaporation of water, and increase the generation rate of water vapor; the water trap 3 provided at the bottom of the high-temperature evaporation box 1 can prevent unevaporated Or the condensed and refluxed water can be recycled to save resources. The water tank 3 can automatically add water, which is highly intelligent and reasonably controls the amount of water added to prevent excessive water addition, resulting in low evaporation efficiency and more water saving and environmental protection.
