A new type of heat and power cogeneration system based on RTO and its working method

Abstract

The present invention relates to a novel heat and power cogeneration system based on RTO and a working method thereof, comprising an RTO device and a gas turbine, wherein the exhaust port of the gas turbine is connected to the high-temperature combustion chamber of the RTO device, the air inlet of the lower box of the RTO device is connected to the air inlet main pipe through an air inlet branch pipe, and the exhaust port of the lower box of the RTO device is connected to the exhaust main pipe through an exhaust branch pipe, the end of the exhaust main pipe is connected to the chimney, the rear end of the exhaust main pipe is connected to the return air main pipe, the return air main pipe is installed with an air inlet pipe, and the return air main pipe is connected to the air inlet main pipe of the RTO device and the purge port of the lower box through the return air branch pipe. The present invention introduces the tail gas of the gas turbine into the high-temperature combustion chamber of the RTO device as cooling air and oxygen-supplementing air, reduces the disturbance of the temperature field caused by the direct entry of cold air, and utilizes 100% of the energy of the gas turbine, and the RTO device reduces the NOx in the tail gas of the gas turbine to N2, thereby realizing ultra-low emission of chimney tail gas.

Description

Technical Field

[0001] The present invention relates to the technical field of heat and power cogeneration, and in particular to a novel heat and power cogeneration system based on RTO and a working method thereof. Background Art

[0002] As mature existing technologies, gas turbines and RTO devices are widely used in the fields of power generation and waste gas treatment. However, gas turbines generally have the problem of low energy utilization efficiency. Small gas turbines based on cogeneration use natural gas to generate electricity and heat, and the total energy utilization rate can only be 80-90% at most. In addition, the exhaust of gas boilers has the problems of NOx not meeting the standards and excessive carbon emissions. At present, many companies produce high-concentration organic exhaust and high-concentration organic waste liquid (similar to production scraps) in their production, but the calorific value of the organic exhaust and organic waste liquid cannot support direct combustion or the amount produced is unstable or insufficient to support continuous combustion. A certain proportion of fuel is required. In order to treat these organic exhaust and organic waste liquid, complex equipment needs to be invested and high operating costs are also required. In addition, companies generally have the problem of insufficient high-grade heat sources and surplus low-grade heat sources. Summary of the invention

[0003] The purpose of the present invention is to provide a new RTO-based cogeneration system and its working method, so as to solve the problems in the prior art of low energy utilization rate of gas turbines, substandard emissions, high cost of treating organic exhaust and waste liquid generated in the production process of enterprises, and insufficient high-grade heat sources of enterprises.

[0004] On one hand, the present invention provides a novel RTO-based cogeneration system, comprising an RTO device and a gas turbine, wherein the exhaust port of the gas turbine is connected to the high-temperature combustion chamber of the RTO device through an exhaust pipe and a valve group, the air inlet of the lower box of the RTO device is connected to the air inlet main pipe through an air inlet branch pipe, and the exhaust port of the lower box of the RTO device is connected to the exhaust main pipe through an exhaust branch pipe, the end of the exhaust main pipe is connected to the chimney, the rear end of the exhaust main pipe is connected to the return air main pipe, the return air main pipe is installed with an air intake pipe, and the return air main pipe is connected to the air inlet main pipe of the RTO device and the purge port of the lower box through the return air branch pipe.

[0005] The upper box at the end of the RTO device is connected to the thermal bypass ventilation duct, and the air outlet of the thermal bypass ventilation duct is divided into two paths, one path is directly connected to the exhaust main pipe of the RTO device through a pipeline and a valve group, and the other path is connected to the exhaust main pipe of the RTO device through a pipeline and a valve group after passing through a heat exchanger. Fan 1 and fan 2 are installed on the air inlet main pipe and the return air main pipe respectively.

[0006] Furthermore, valve groups are installed on the air intake main pipe, air intake branch pipe, exhaust branch pipe, return air branch pipe and air intake pipe.

[0007] Furthermore, a burner is installed on the top of the upper box of the RTO device, and the burner is connected to a multi-fuel injection device.

[0008] Furthermore, a filter is installed on the fresh air intake pipe of the gas turbine.

[0009] Another aspect of the present invention provides a working method of a novel RTO-based cogeneration system, comprising the following steps:

[0010] (1) The VOC-containing gas is pressurized by the blower and enters the RTO device through the intake main pipe and the intake branch pipe. The tail gas after the gas turbine generates power is transported to the high-temperature combustion chamber of the RTO device through the exhaust pipe. The VOC-containing gas and the tail gas of the gas turbine are mixed in the RTO device and undergo redox reaction;

[0011] (2) Part of the clean air after the reaction in the RTO device is discharged into the chimney through the exhaust branch pipe and the exhaust main pipe at the bottom of the RTO device, and the other part of the high-temperature clean air enters the heat exchanger through the hot bypass duct for heat recovery and then flows into the exhaust main pipe and is discharged into the chimney.

[0012] Furthermore, part of the clean air in the exhaust main pipe is mixed with the fresh air introduced from the air intake pipe in the return air main pipe and pressurized by fan 2 before being input into the air intake main pipe or the purge port of the RTO device through the return air branch pipe as makeup air or purge air.

[0013] The beneficial effects of adopting the above technical solution of the present invention are:

[0014] The present invention introduces the tail gas of the gas turbine as cooling air and oxygen-supplementing air into the high-temperature combustion chamber of the RTO device, thereby reducing the disturbance of the temperature field caused by the direct entry of cold air, and utilizing 100% of the energy of the gas turbine. Through the reaction in the high-temperature combustion chamber of the RTO device, the NOx in the tail gas of the gas turbine is reduced to N2, thereby realizing ultra-low emission of chimney tail gas; a heat exchanger is arranged on the heat bypass of the RTO device to generate high-grade steam, heat transfer oil or hot water required by the enterprise; part of the gas in the exhaust main pipe is refluxed to the RTO device, reducing the air volume of chimney emissions, reducing the total amount of low-grade heat, and converting the low-grade heat source into a high-grade heat source; through the cogeneration of heat and power, the air volume and temperature of chimney emissions are greatly reduced, thereby reducing carbon emissions, and the comprehensive energy utilization rate is greater than 95%; through the application of the multi-fuel injection patented combustion technology, the high-concentration organic exhaust and high-concentration organic waste liquid generated in the production process of the enterprise are recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a novel RTO-based cogeneration system of the present invention;

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0017] 1-RTO device, 2-gas turbine, 3-exhaust pipe, 4-intake branch pipe, 5-intake main pipe, 6-exhaust branch pipe, 7-exhaust main pipe, 8-chimney, 9-return air main pipe, 10-air intake pipe, 11-return air branch pipe, 12-thermal bypass duct, 13-heat exchanger, 14-fan 1, 15-fan 2, 16-burner, 17-multi-fuel injection device, 18-filter. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0019] like Figure 1 As shown, this embodiment is a novel RTO-based cogeneration system, comprising an RTO device 1 and a gas turbine 2, wherein the exhaust port of the gas turbine 2 is connected to the high-temperature combustion chamber of the RTO device 1 through an exhaust pipe 3 and a valve group, and the exhaust gas of the gas turbine 2 is introduced into the RTO device 1 as cooling air and oxygen-supplementing air, thereby reducing the disturbance of the temperature field in the RTO device 1 by the cold air and making 100% use of the gas of the gas turbine 2. The exhaust gas of the gas turbine 2 participates in the reaction in the RTO device 1 to reduce NOx to N2. The air inlet of the lower box of the RTO device 1 is connected to the high-temperature combustion chamber of the RTO device 1 through an air inlet separator. The pipe 4 is connected to the air intake main pipe 5, and the exhaust port of the lower box of the RTO device 1 is connected to the exhaust main pipe 7 through the exhaust branch pipe 6. The end of the exhaust main pipe 7 is connected to the chimney 8. The rear end of the exhaust main pipe 7 is connected to the return air main pipe 9. The return air main pipe 9 is installed with an air intake pipe 10. The return air main pipe 9 is connected to the air intake main pipe 5 and the purge port of the lower box of the RTO device 1 through the return air branch pipe 11. The RTO device 1 is a prior art, and its working principle is not introduced here. Part of the exhaust gas in the exhaust main pipe 7 is refluxed to the RTO device 1, reducing the exhaust air volume of the chimney 8 and reducing the total amount of low-grade heat. The upper box at the end of the RTO device 1 is connected to the thermal bypass ventilation pipe 12. The air outlet of the thermal bypass ventilation pipe 12 is divided into two paths. One path is directly connected to the exhaust main pipe 7 of the RTO device 1 through a pipeline and a valve group, and the other path is connected to the exhaust main pipe 7 of the RTO device 1 through a pipeline and a valve group after passing through a heat exchanger 13. Through the setting of the heat exchanger 13 on the thermal bypass, the heat is recycled and utilized, and high-grade steam and appropriate hot water are provided to the enterprise. The air intake main pipe 5 and the return air main pipe 9 are respectively installed with a fan 14 and a fan 2 15. The gas is pressurized by the fan 14 and the fan 2 15. The air intake main pipe 5, the air intake branch pipe 4, the exhaust branch pipe 6, the return air branch pipe 11 and the air intake pipe 10 are all equipped with valve groups, and the switches of each valve group are adjusted according to production needs.

[0020] Specifically, a burner 16 is installed at the top of the upper box of the RTO device 1, and the gas inlet of the burner 16 is connected to a multi-fuel injection device 17. Fuel, high-concentration organic exhaust gas, and high-concentration organic waste liquid are sprayed into the reaction chamber of the RTO device 1 through the multi-fuel injection device 17 to participate in the redox reaction.

[0021] Preferably, a filter 18 is installed on the fresh air intake pipe 10 of the gas turbine 2 , and the air entering the gas turbine 2 is filtered by the filter 18 .

[0022] The working method of the novel RTO-based cogeneration system comprises the following steps:

[0023] (1) The VOCs-containing gas is pressurized by the fan 14 and enters the RTO device 1 through the intake main pipe 5 and the intake branch pipe 4. The tail gas after the gas turbine 2 generates power is transported to the high-temperature combustion chamber of the RTO device 1 through the exhaust pipe 3. The VOCs-containing gas and the tail gas of the gas turbine 2 are mixed in the RTO device 1 and undergo redox reaction;

[0024] (2) A portion of the clean air after the reaction in the RTO device 1 is discharged into the chimney 8 through the exhaust branch pipe 6 and the exhaust main pipe 7 at the bottom of the RTO device 1, and the other portion of the high-temperature clean air enters the heat exchanger 13 through the hot bypass duct 12 for heat recovery and then flows into the exhaust main pipe 7 and then discharged into the chimney 8.

[0025] Preferably, part of the clean air in the exhaust main pipe 7 is mixed with the fresh air introduced from the air intake pipe 10 in the return air main pipe 9 and pressurized by the fan 2 15 before being input into the air intake main pipe 5 or the purge port of the RTO device 1 through the return air branch pipe 11 as makeup air or purge air.

[0026] In summary, the present invention introduces the exhaust gas of the gas turbine as cooling air and oxygen-supplementing air into the high-temperature combustion chamber of the RTO device, thereby reducing the disturbance of the temperature field caused by the direct entry of cold air, and utilizing 100% of the energy of the gas turbine. Through the reaction in the high-temperature combustion chamber of the RTO device, the Nox in the exhaust gas of the gas turbine is reduced to N2, thereby achieving ultra-low emissions of chimney exhaust gas; a heat exchanger is arranged on the thermal bypass of the RTO device to produce high-grade steam, heat transfer oil or hot water required by the enterprise; part of the gas in the exhaust main pipe is returned to the RTO device to reduce the air volume of chimney emissions, reduce the total amount of low-grade heat, and convert the low-grade heat source into a high-grade heat source; through the cogeneration of heat and power, the air volume and temperature of chimney emissions are greatly reduced, thereby reducing carbon emissions, and the comprehensive energy utilization rate is greater than 95%; through the use of multi-fuel injection patented combustion technology, the high-concentration organic exhaust and high-concentration organic waste liquid generated in the production process of the enterprise are recycled.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A new RTO-based cogeneration system, characterized in that: The invention comprises an RTO device and a gas turbine, wherein the exhaust port of the gas turbine is connected to the high-temperature combustion chamber of the RTO device through an exhaust pipe and a valve group, the air inlet of the lower box of the RTO device is connected to the air inlet main pipe through an air inlet branch pipe, and the exhaust port of the lower box of the RTO device is connected to the exhaust main pipe through an exhaust branch pipe, the end of the exhaust main pipe is connected to the chimney, the rear end of the exhaust main pipe is connected to the return air main pipe, the return air main pipe is installed with an air inlet pipe, the return air main pipe is connected to the air inlet main pipe of the RTO device and the purge port of the lower box through the return air branch pipe, the upper box at the end of the RTO device is connected to a thermal bypass air duct, the air outlet of the thermal bypass air duct is divided into two paths, one path is directly connected to the exhaust main pipe of the RTO device through a pipeline and a valve group, and the other path is connected to the exhaust main pipe of the RTO device through a pipeline and a valve group after passing through a heat exchanger, and a fan 1 and a fan 2 are respectively installed on the air inlet main pipe and the return air main pipe.

2. The novel RTO-based cogeneration system according to claim 1 is characterized in that: Valve groups are installed on the air intake main pipe, the air intake branch pipe, the exhaust branch pipe, the return air branch pipe and the air intake pipe.

3. The novel RTO-based cogeneration system according to claim 1 is characterized in that: A burner is installed on the top of the upper box of the RTO device, and the burner is connected to a multi-fuel injection device.

4. The novel RTO-based cogeneration system according to claim 1 is characterized in that: A filter is installed on the fresh air intake pipe of the gas turbine.

5. A working method of a novel cogeneration system based on RTO, characterized in that: The steps include: (1) The VOC-containing gas is pressurized by the blower and enters the RTO device through the intake main pipe and the intake branch pipe. The tail gas after the gas turbine generates power is transported to the high-temperature combustion chamber of the RTO device through the exhaust pipe. The VOC-containing gas and the tail gas of the gas turbine are mixed in the RTO device and undergo redox reaction; (2) Part of the clean air after the reaction in the RTO device is discharged into the chimney through the exhaust branch pipe and the exhaust main pipe at the bottom of the RTO device, and the other part of the high-temperature clean air enters the heat exchanger through the hot bypass duct for heat recovery and then flows into the exhaust main pipe and is discharged into the chimney.

6. The working method of the novel RTO-based cogeneration system according to claim 5, characterized in that: Part of the clean air in the exhaust main pipe is mixed with the fresh air introduced from the air intake pipe in the return air main pipe and pressurized by the second fan before being input into the air intake main pipe or the purge port of the RTO device through the return air branch pipe as makeup air or purge air.

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