Reduction device, method and gas power machine and boiler heat supply system, method

Abstract

The present application relates to cogeneration technology field, its purpose is to provide a kind of reducing device, method and gas power machine and boiler heat supply system, method, the nitrogen oxide removal rate of this reducing device is high, the above-mentioned reducing device includes shell and is arranged in shell and sequentially communicates first cavity, second cavity and third cavity, first cavity has waste gas inlet and first gas inlet, third cavity has second gas inlet and waste gas outlet.The present application solves the problem that the reducing device in the prior art removes nitrogen oxides by catalyst, so that the system operating cost is higher, and the auxiliary device of the heat supply system needs external power driving, the problem of high power cost, and the influence of external power supply system is larger.

Description

Technical Field

[0001] This invention relates to the field of combined heat and power (CHP) technology, specifically to a reduction device, method, and a gas-fired power generator and boiler CHP supply system and method. Background Technology

[0002] A heat and power supply system is a system that uses primary energy sources such as natural gas to generate heat and electricity. It is an indispensable part of residential life and social production. A heat and power supply system can provide electricity to residents or factories in the area to meet their daily needs and provide heat for heating in winter.

[0003] Typically, a cogeneration system includes a gas-fired boiler, a water supply unit, and a fan. The auxiliary units such as the water supply unit and the fan are generally driven by external electricity. On the one hand, this results in high electricity consumption and high electricity costs. On the other hand, in areas with power shortages or unstable power supply, it is difficult to ensure the stable operation of the cogeneration system.

[0004] Furthermore, the gas turbine in a cogeneration system generates a large amount of waste gas during operation, which contains a high concentration of nitrogen oxides. These oxides cannot be effectively removed through boiler heat exchange and are directly released into the atmosphere, causing environmental pollution. To address this, existing cogeneration systems are equipped with reduction devices that use catalysts to induce oxidation-reduction reactions in the waste gas, thus removing nitrogen oxides. However, because the active components of these catalysts include transition metals such as Cu, Mn, Fe, Ni, and Co, rare earth elements such as Ce, La, Nd, In, and Y, and precious metals such as Pd, Pt, and Rh, the cost of using these catalysts is high, leading to increased economic costs for the cogeneration system. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art in which the reduction device removes nitrogen oxides by catalyst, which makes the system operating cost higher and the auxiliary device of the thermoelectric supply system requires external power to drive, resulting in high electricity cost and great influence from the external power supply system. Thus, the present invention provides a reduction device, method, gas engine and boiler thermoelectric supply system and method with lower system operating cost, high nitrogen oxide removal rate in exhaust gas and no influence from the external power supply system.

[0006] Therefore, the present invention provides a reduction device for reducing waste gas, comprising: a housing and a first cavity, a second cavity and a third cavity disposed within the housing and connected in sequence, the first cavity having a waste gas inlet and a first fuel gas inlet, and the third cavity having a second fuel gas inlet and a waste gas outlet.

[0007] Optionally, the first gas inlet is disposed between the first cavity and the second cavity, and is inclined toward the first cavity; the second gas inlet is disposed between the second cavity and the third cavity, and is inclined toward the third cavity.

[0008] Optionally, the acute angle between the injection direction of the first gas inlet and the axial direction of the housing is [30°, 45°]; the acute angle between the injection direction of the second gas inlet and the axial direction of the housing is [45°, 60°].

[0009] Optionally, the length of the first cavity is [20%, 25%] of the length of the shell, the length of the second cavity is [25%, 30%] of the length of the shell, and the length of the third cavity is [45%, 55%] of the length of the shell.

[0010] Optionally, the number of the first gas inlets is at least four, and they are spaced apart circumferentially along the inner wall of the housing; the number of the second gas inlets is at least four, and they are spaced apart circumferentially along the inner wall of the housing.

[0011] Optionally, the outer wall and the inner wall of the housing have a cavity.

[0012] Optionally, the cavity has an air inlet.

[0013] Optionally, there may be multiple exhaust gas outlets, which are arranged at intervals along the circumference of the housing.

[0014] A method for reducing the above-mentioned reduction apparatus includes:

[0015] After the exhaust gas and fuel gas are mixed in the first chamber to form an exhaust gas-fuel mixture, they enter the second chamber.

[0016] The waste gas-fuel mixture is burned in the second chamber, exhausting the oxygen in the waste gas-fuel mixture. The waste gas-fuel mixture is heated to above 800°C, becoming high-temperature waste gas, and then enters the third chamber.

[0017] The high-temperature exhaust gas comes into contact with the fuel gas, reducing the nitrogen oxides in the high-temperature exhaust gas;

[0018] The high-temperature exhaust gas is discharged after reduction treatment.

[0019] A gas-fired power generator and boiler heat and power supply system includes the aforementioned reduction device, and further includes a gas-fired power generator, a power generation device, and a boiler. The power output end of the gas-fired power generator is connected to the power input end of the power generation device, and the exhaust gas outlet of the gas-fired power generator is connected to the exhaust gas inlet of the reduction device. The boiler is equipped with a burner, and the inlet of the burner is connected to the exhaust gas outlet of the reduction device.

[0020] Optionally, a water supply device is also included, with the water outlet of the water supply device connected to the water inlet of the gas-fired engine and the water inlet of the boiler.

[0021] Optionally, a first control valve is installed on the pipeline between the water outlet of the water supply device and the water inlet of the gas-fired power unit, and a second control valve is installed on the pipeline between the water outlet of the water supply device and the water inlet of the boiler.

[0022] Optionally, the outlet of the gas-fired engine is connected to the inlet of the boiler.

[0023] Optionally, a third control valve is installed on the pipeline between the outlet of the gas-fired engine and the inlet of the boiler.

[0024] Optionally, it also includes an induced draft fan and an expelled draft fan. The air inlet of the expelled draft fan is connected to the atmosphere, the air outlet of the expelled draft fan is connected to the air inlet on the shell of the reduction device and the air inlet of the burner, the boiler exhaust port is connected to the air inlet of the induced draft fan, and the air outlet of the induced draft fan is connected to the atmosphere.

[0025] Optionally, it also includes a gas supply pipeline, which is connected to the gas inlet of the gas engine, the first gas inlet, the second gas inlet of the reduction device, and the gas inlet of the burner.

[0026] Optionally, the power output terminal of the power generation device is connected to at least one of the power input terminals of the water supply device, the induced draft fan, and the forced draft fan.

[0027] A method for supplying heat and electricity to a gas-fired engine and boiler, employing the aforementioned gas-fired engine and boiler heat and electricity supply system, includes the following steps:

[0028] A gas-powered motor drives a power generation device to generate electricity, which supplies power to at least one of a blower, an induced draft fan, and a water supply device, while the water supply device supplies cold water to the gas-powered motor and the boiler.

[0029] The exhaust gas from the gas-powered engine passes through a reduction device;

[0030] The high-temperature exhaust gas, after being treated by the reduction device, enters the boiler;

[0031] The boiler heats cold water into hot water and outputs it to the outside.

[0032] Optionally, the power generation device may also supply power to an external power system.

[0033] Optionally, the gas engine is an internal combustion engine, and the amount of gas consumed by the internal combustion engine accounts for [5% to 15%] of the total amount of gas consumed by the gas engine and the boiler heat and power supply system.

[0034] The present invention has the following advantages:

[0035] 1. The reduction device provided by the present invention has a first cavity, a second cavity and a third cavity inside the housing. The exhaust gas can be mixed with the gas injected into the first gas inlet in the first cavity, and undergo a reduction reaction with the gas injected into the second gas inlet in the third cavity, thereby reducing the nitrogen oxides in the original exhaust gas. This reduction device has a simple structure, good exhaust gas reduction effect and low reduction cost.

[0036] 2. The reduction device provided by the present invention has a first gas inlet located between the first and second chambers and inclined toward the first chamber. The high-speed gas injected through the first gas inlet can fully mix the gas with the exhaust gas. The second gas inlet is located between the second and third chambers and inclined toward the third chamber. The gas injected into the third chamber through the second gas inlet has a longer residence time in the third chamber and a longer reaction time with the exhaust gas, which can fully reduce the exhaust gas and ensure that the discharged gas does not contain nitrogen oxides and will not pollute the environment.

[0037] 3. The reduction device provided by the present invention has a cavity between the outer wall and the inner wall of the shell, and the cavity has an air inlet. By introducing air into the cavity, the inner wall can be cooled, preventing the shell from being burned by high-temperature exhaust gas and extending the service life of the reduction device.

[0038] 4. The reduction method provided by the present invention involves fully mixing the waste gas with the fuel gas in the first chamber, then burning the waste gas in the second chamber to consume the oxygen and raise the temperature to high temperature. Subsequently, the waste gas undergoes a reduction reaction with the fuel gas in the third chamber to reduce the nitrogen oxides in the high temperature waste gas. This reduction method does not require the use of a reducing agent and can treat nitrogen oxides in the waste gas using only the fuel gas. The waste gas reduction cost is low and the nitrogen oxide removal rate is high.

[0039] 5. The gas-fired power engine and boiler thermal power supply system provided by this invention generates electricity through a power unit driving a power generation unit, outputting electrical energy. The boiler can utilize the heat energy in the exhaust gas discharged from the power unit. The entire system can also provide external heating and power, meeting the region's demand for electricity and heat energy. Simultaneously, the reduction device can reduce nitrogen oxides in the exhaust gas discharged from the power unit, ensuring that the gas emitted into the atmosphere by the system does not cause air pollution.

[0040] 6. The gas-fired engine and boiler thermoelectric supply method provided by the present invention can provide electrical energy and thermal energy. At the same time, by adjusting the amount of gas consumed by the internal combustion engine, the thermoelectric supply ratio of the system can be adjusted, thereby rationally allocating the output ratio of electrical energy and thermal energy, ensuring full utilization of energy and preventing waste. Moreover, the exhaust gas has a high reduction rate and will not cause air pollution. Attached Figure Description

[0041] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the reduction device of the present invention;

[0043] Figure 2 This is a schematic diagram of the gas-fired power engine and boiler thermal power supply system of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1-Reduction device, 101-Shell, 102-First cavity, 103-Second cavity, 104-Third cavity, 105-Exhaust gas inlet, 106-First fuel gas inlet, 107-Second fuel gas inlet, 108-Exhaust gas outlet, 109-Cavity, 1010-Air inlet, 1011-First fuel gas conduit, 1012-Second fuel gas conduit;

[0046] 2-Gas-fired engine;

[0047] 3-Power generation unit;

[0048] 4-Boiler, 401-Burner;

[0049] 5-Water supply device;

[0050] 6-First control valve;

[0051] 7-Second control valve;

[0052] 8-Third control valve;

[0053] 9-Exhaust fan;

[0054] 10-Blower;

[0055] 11-Gas supply pipeline. Detailed Implementation

[0056] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0060] like Figure 1 The image shows a preferred embodiment of the reduction device 1 provided by the present invention. This reduction device 1 can be applied to a thermoelectric supply system to reduce waste gas. This reduction device 1 can reduce waste gas without adding a reducing agent, saving reduction costs. Moreover, it has a high removal rate of nitrogen oxides, thereby ensuring that the gas emitted into the atmosphere by the thermoelectric supply system does not contain nitrogen oxides and will not cause air pollution.

[0061] The aforementioned reduction device 1 includes: a housing 101 and a first cavity 102, a second cavity 103, and a third cavity 104 disposed within the housing 101 and connected in sequence. The housing 101 is a hollow tube with openings at both ends. One end is the exhaust gas inlet 105 of the first cavity 101, and the other end is the exhaust gas outlet 108 of the third cavity 104. A cavity 109 is formed between the outer wall and the inner wall of the housing 101. An air inlet 1010 is provided on the cavity 109. The air inlet 1010 is located close to the exhaust gas inlet 105. Air is introduced through the air inlet 1010 to cool the inner wall of the housing 101 and prevent the housing 101 from being damaged due to prolonged exposure to high temperatures.

[0062] like Figure 1 The restoration device shown has a first cavity 102 located on the left side of the housing 101. The length of the first cavity 102 is 20%-25% of the overall length of the housing 101. The first cavity 102 has an exhaust gas inlet 105 and a first gas inlet 106. The first gas inlet 106 is located between the first cavity 102 and the second cavity 103, and is inclined towards the first cavity 102. Specifically, the acute angle between the injection direction of the first gas inlet 106 and the axial direction of the housing 101 is [30°, 45°], and the number of first gas inlets 106 is at least four, spaced circumferentially along the inner wall of the housing 101. In this embodiment, the length of the first cavity 102 is preferably 20% of the length of the housing 101, the acute angle between the injection direction of the first gas inlet 106 and the axial direction of the housing 101 is preferably 45°, and four first gas inlets 106 are provided, evenly spaced circumferentially along the inner wall of the housing 101.

[0063] Furthermore, the first gas inlet 106 is connected to a first gas conduit 1011. The first gas conduit 1011 has a first horizontal portion and a first inclined portion. The first inclined portion communicates with the first gas inlet 106, and the acute angle between the axial direction of the first inclined portion and the axial direction of the housing 101 is 45°. The axis of the first horizontal portion is parallel to the axial direction of the housing 101, which facilitates the arrangement and connection of the first gas conduit 1011 and saves installation space. Specifically, since there are four first gas inlets 106 in this embodiment, there are also four corresponding first gas conduits 1011, and the four first gas conduits 1011 are respectively connected to the four first gas inlets 106.

[0064] The first chamber 102 is a chamber for premixing exhaust gas and fuel gas to form an exhaust gas-fuel mixture. Exhaust gas enters the first chamber 102 through the exhaust gas inlet 105, and fuel gas is injected into the first chamber 102 through the first fuel gas conduit 1011 and the first fuel gas inlet 106. Since the fuel gas injection speed is much greater than the exhaust gas movement speed, and the fuel gas is injected at a 45° angle, the fuel gas and exhaust gas can be mixed more evenly, which facilitates the subsequent reduction of nitrogen oxides in the exhaust gas-fuel mixture.

[0065] The second cavity 103 is connected to the first cavity 102, and its length is [25% or 30%] of the length of the shell 101. In this embodiment, the length of the second cavity 103 is preferably 30% of the length of the shell 101, and an ignition device is provided in the second cavity 103. The second cavity 103 is mainly used to burn the well mixed exhaust gas-fuel mixture in the first cavity 102 to consume the oxygen in it and raise the temperature of the exhaust gas-fuel mixture to become high-temperature exhaust gas, so that it reaches a state suitable for reduction reaction. This prevents the exhaust gas-fuel mixture from containing oxygen or having insufficient temperature, which would affect the reduction reaction and lead to incomplete reduction of nitrogen oxides.

[0066] The third cavity 104 is located on the right side of the housing 101 and communicates with the second cavity 103. The length of the third cavity 104 is [45%, 55%] of the length of the housing 101. It has a second gas inlet 107 and an exhaust outlet 108. The second gas inlet 107 is located between the second cavity 103 and the third cavity 104 and is inclined towards the third cavity 103. Specifically, the acute angle between the injection direction of the second gas inlet 107 and the axial direction of the housing 101 is [45°, 60°], and the number of second gas inlets is at least four, which are spaced apart circumferentially along the inner wall of the housing. The number of exhaust outlets 105 is multiple, which are also spaced apart circumferentially along the housing 101. In this embodiment, the length of the third cavity 104 is preferably 50% of the length of the housing 101, the acute angle between the injection direction of the second gas inlet 107 and the axial direction of the housing 101 is 45°, and the number of the second gas inlet 107 and the exhaust gas outlet 108 are both four, which are evenly spaced along the circumferential distance of the inner wall of the housing 101.

[0067] Furthermore, the second gas inlet 107 is connected to a second gas conduit 1012. The second gas conduit 1012 has a second horizontal portion and a second inclined portion. The second inclined portion communicates with the second gas inlet 107, and the acute angle between the axis of the second inclined portion and the axis of the housing 101 is 45°. The axis of the second horizontal portion is parallel to the axis of the housing 101. Moreover, the first horizontal portion and the second horizontal portion are arranged side by side, which facilitates the arrangement and connection of the second gas conduit 1012 and saves installation space. Specifically, since there are four second gas inlets 107 in this embodiment, there are also four corresponding second gas conduits 1012, and the four second gas conduits 1012 are respectively connected to the four second gas inlets 107.

[0068] In the third chamber 104, high-temperature exhaust gas mixes with fuel gas and undergoes a reduction reaction to remove nitrogen oxides. A second fuel gas inlet 107 is positioned between the second chamber 103 and the third chamber 104. The fuel gas ejected from the second fuel gas inlet 107 enters the third chamber 104 and immediately comes into contact with the high-temperature exhaust gas. This arrangement of the second fuel gas inlet 107 allows for a longer residence time of the fuel gas within the third chamber 104. Furthermore, the fuel gas is injected at a 45° angle, ensuring more thorough contact with the high-temperature exhaust gas. In addition, the length of the third chamber 104 accounts for 50% of the total length of the casing. These design features all contribute to a longer reduction reaction time, ensuring complete reduction of nitrogen oxides in the high-temperature exhaust gas.

[0069] In other embodiments, the length of the first cavity 102 may also be 21%, 23%, 25%, etc. of the length of the housing 101; the acute angle between the injection direction of the first gas inlet 106 and the axial direction of the housing 101 may also be 30°, 35°, 40°, etc.; the number of first gas inlets 106 may also be six, eight, etc.; the acute angle between the axial direction of the first inclined portion of the corresponding first gas conduit 1011 and the axial direction of the housing 101 should be the same as the acute angle between the injection direction of the first gas inlet 106 and the axial direction of the housing 101; and the number and location of the first gas conduit 1011 should also correspond to the number and location of the first gas inlets 106.

[0070] In other embodiments, the length of the second cavity 102 may also be 25%, 27%, etc., of the length of the housing 101.

[0071] In other embodiments, the length of the third cavity 104 may also be 45% or 55% of the length of the housing 101. Furthermore, the acute angle between the injection direction of the second gas inlet 107 and the axial direction of the housing 101 may be 50°, 55°, or 60°, and the number of second gas inlets 107 may be six or eight. Correspondingly, the acute angle between the axial direction of the second inclined portion of the second gas conduit 1012 and the axial direction of the housing 101 should be the same as the acute angle between the injection direction of the second gas inlet 107 and the axial direction of the housing 101. The number and location of the second gas conduits 1012 should also correspond to the number and location of the second gas inlets 107. In addition, the number of exhaust gas outlets 108 may also be six or eight.

[0072] This embodiment also provides a restoration method for the restoration device 1, including the following steps:

[0073] (1) After the exhaust gas and the fuel gas are mixed in the first cavity 102 to form an exhaust gas-fuel mixture, they enter the second cavity 103;

[0074] The exhaust gas containing nitrogen oxides enters the first chamber 102 through the exhaust gas inlet 105 and is fully mixed with the gas injected from the first gas inlet 106. The mixture then enters the second chamber 103 as an exhaust gas-gas mixture. In this embodiment, the gas is preferably natural gas.

[0075] (2) The waste gas-fuel mixture is burned in the second chamber 103, exhausting the oxygen in the waste gas-fuel mixture. The waste gas-fuel mixture is heated to above 800°C and becomes high-temperature waste gas, which then enters the third chamber 104.

[0076] After the waste gas mixture enters the second chamber 103, it is ignited and burned by an ignition device located at the end of the second chamber 103. During the combustion process, the oxygen in the waste gas mixture is exhausted, and the waste gas mixture is gradually heated to 800°C, eventually forming high-temperature waste gas that enters the third chamber 104.

[0077] (3) The high-temperature exhaust gas comes into contact with the combustion gas, reducing the nitrogen oxides in the high-temperature exhaust gas;

[0078] After the high-temperature exhaust gas enters the third chamber 104, it comes into contact with the gas injected from the second gas inlet 107, and a reduction reaction begins. Since the gas is preferably natural gas in this embodiment, its main component is methane (CH4), and the main component of nitrogen oxides is NO, it will react with CH4 and the products of the CH4 combustion process in the third chamber 104. i The CO produced by the combustion of CH4 in the second chamber undergoes a reduction reaction, ultimately generating CO2, N2, and H2O, which are products that do not pollute the air.

[0079] Its chemical reaction formula is as follows:

[0080] CH4→CH i +H

[0081] NO + CH4 → CH i +N2+H2O

[0082] NO+CH i →CO2+N2+H2O

[0083] NO+CO→CO2+N2

[0084] (4) The high-temperature exhaust gas after reduction treatment is discharged.

[0085] After undergoing a reduction reaction in the third chamber 104, the high-temperature exhaust gas is discharged through the exhaust gas outlet. Since there are multiple exhaust gas outlets 108, the diffusion area of ​​the exhaust gas is increased, resulting in a better diffusion effect and facilitating the subsequent utilization of the treated high-temperature exhaust gas.

[0086] like Figure 2 As shown, this embodiment also provides a gas-fired power generator and boiler heat and power supply system, including a reduction device 1, a gas-fired power generator 2, a power generation device 3 and a boiler 4. The power output end of the gas-fired power generator 2 is connected to the power input end of the power generation device 3. The exhaust gas outlet of the gas-fired power generator 2 is connected to the exhaust gas inlet 105 of the reduction device 1. The exhaust gas outlet 108 of the reduction device 1 is connected to the inlet of the burner 401 installed on the boiler 4.

[0087] Wherein, the gas power engine 2 is one or more of an internal combustion engine, a gas turbine, or a gas Stirling engine. In this embodiment, the gas power engine 2 is preferably an internal combustion engine and is installed in the inlet air duct of the boiler blower 10. The power generation device 3 is preferably a generator, and the reduction device 1 is the reduction device 1 in this embodiment.

[0088] After the internal combustion engine is supplied with fuel gas, it converts chemical energy into mechanical energy, thereby driving the generator. The generator's power output is connected to at least one of the power input terminals of the water supply device, the blower, and the induced draft fan, thus achieving full or partial self-powering of the thermoelectric supply system. During operation, the internal combustion engine produces high-temperature exhaust gas containing nitrogen oxides. After being reduced by the reduction device 1, the exhaust gas is discharged into the burner 401, where fuel gas is simultaneously supplied for combustion. Finally, the high-temperature exhaust gas reduced by the reduction device 1 and the heat generated by combustion are absorbed and utilized together in the boiler 4.

[0089] In addition, the gas-fired power engine and boiler thermal power supply system also includes a water supply device 5. In this embodiment, the water supply device 5 is preferably a water pump. The water pump's inlet is connected to an external water source, and its outlet is connected to the gas-fired power engine's inlet and the boiler's inlet. The gas-fired power engine's outlet is also connected to the boiler's inlet, and the boiler's outlet is connected to an external water supply pipeline.

[0090] Furthermore, a first control valve 6 is installed on the pipeline between the water pump outlet and the gas engine inlet; a second control valve 7 is installed on the pipeline between the water pump outlet and the boiler inlet; and a third control valve 8 is installed on the pipeline between the gas engine outlet and the boiler inlet. These control valves allow for the control of the flow of each pipeline. The water pump delivers cold water to the gas engine 2 (i.e., the internal combustion engine) and the boiler 4. The cold water cools the cylinder liners of the internal combustion engine before being discharged into the boiler 4, thus utilizing the heat generated by the cylinder liners during engine operation and improving the system's heat utilization rate. Finally, the cold water is heated into hot water in the boiler and discharged.

[0091] Furthermore, the gas turbine and boiler thermal power supply system also includes an induced draft fan 9 and an expelled draft fan 10. The expelled draft fan inlet is connected to the atmosphere, and the expelled draft fan outlet is connected to the air inlet 1010 on the housing 101 of the reduction device 1 and the burner air inlet, providing air to the reduction device 1 to cool the inner wall of the housing 101 and providing combustion-supporting gas to the burner 401. The induced draft fan inlet is connected to the boiler exhaust port, and the induced draft fan outlet is connected to the atmosphere, used to discharge the gas inside the boiler 4 into the atmosphere. Since the gas turbine and boiler thermal power supply system has a reduction device 1, nitrogen oxides in the exhaust gas can be removed, so the gas discharged into the atmosphere will not cause pollution.

[0092] Furthermore, the gas turbine and boiler thermal power supply system also includes a gas supply pipeline 11. The gas supply pipeline 11 is connected to the gas inlet of the gas turbine, the first gas inlet 106 and the second gas inlet 107 of the reduction device 1, and the gas inlet of the burner. The gas supply pipeline 11 supplies the required gas to the gas turbine 2, the reduction device 1, and the burner 401. The gas can be natural gas, manufactured gas, coke oven gas, chemical waste gas, etc., with a calorific value of not less than 1500 kcal / Nm³. 3 The combustible gas is preferably natural gas in this embodiment.

[0093] In other embodiments, the gas turbine 2 may be a gas turbine, a gas Stirling engine, a combination of an internal combustion engine and a gas turbine, etc.

[0094] In other embodiments, the gas can also be manufactured gas, coke oven gas, etc.

[0095] This embodiment also provides a gas-powered engine and boiler heat and power supply method. This method employs the gas-powered engine and boiler heat and power supply system described in the above embodiment, and includes the following steps:

[0096] (1) The gas engine 2 drives the power generation device 3 to generate electricity. The power generation device 3 supplies power to at least one of the induced draft fan 6, the forced draft fan 10 and the water supply device 5. The water supply device 5 supplies cold water to the gas engine 2 and the boiler 4.

[0097] Gas is supplied to the gas-powered motor 2 through the gas supply pipeline 11. The gas-powered motor 2 drives the generator 3 to generate electricity. In this embodiment, the gas is preferably natural gas, the gas-powered motor 2 is preferably an internal combustion engine, and the generator 3 is preferably a generator. The generator outputs electrical energy to supply at least one of the blower 10, the induced draft fan 9, and the water supply device 5, and can also supply power to external systems. Whether to supply power to external systems and the amount of power supplied to external systems can be controlled by adjusting the amount of gas supplied to the internal combustion engine. However, the amount of gas consumed by the internal combustion engine accounts for at least 5% and at most no more than 15% of the total amount of gas consumed by the gas-powered motor and the boiler thermal power supply system. In this embodiment, the amount of gas consumed by the internal combustion engine accounts for 5% of the total amount of gas consumed by the gas-powered motor and the boiler thermal power supply system. At this time, the electrical energy output by the generator just meets the electrical energy needs of the blower 10, the induced draft fan 9, and the water supply device 5.

[0098] (2) The exhaust gas discharged from the gas-powered engine 2 passes through the reduction device 1;

[0099] When an internal combustion engine is working, it produces high-temperature exhaust gas, which contains nitrogen oxides. To utilize this heat, the exhaust gas needs to be treated in a reduction device 1. During the reduction process, gas is introduced into the reduction device 1 through a gas supply pipe 11. The amount of gas introduced accounts for [3, 9%] of the total gas consumption of the system. Among them, the gas introduced into the first gas inlet 106 accounts for [2, 6%] of the total gas consumption of the system, and the gas introduced into the second gas inlet 107 accounts for [1, 3%] of the total gas consumption of the system. At the same time, air is introduced into the air inlet 1010 of the reduction device through a blower 10 to cool the inner wall of the casing 101. The amount of air introduced is [10, 15%] of the total air required by the boiler 4. After cooling, the air is discharged into the burner 401 as an auxiliary combustion gas.

[0100] Specifically, in this embodiment, the amount of gas introduced into the reduction device 1 accounts for 9% of the total gas consumption of the system, of which the gas introduced into the first gas inlet 106 accounts for 6% of the total gas consumption of the system, the gas introduced into the second gas inlet 107 accounts for 3% of the total gas consumption of the system, and the amount of air introduced is 10% of the total air required by the boiler 4.

[0101] (3) The high-temperature exhaust gas after being treated by the reduction device 1 enters the boiler 4;

[0102] The nitrogen oxides in the high-temperature exhaust gas treated by the reduction device 1 have been reduced, and their heat can be utilized when it enters the boiler 4. At the same time, the gas supply pipe 11 supplies gas to the burner 401, and the blower 10 supplies air to the burner 401. The heat generated by the combustion of the gas in the burner 401 is also absorbed and utilized by the boiler 4.

[0103] (4) Boiler 4 heats cold water into hot water and outputs it to the outside.

[0104] Boiler 4 utilizes the heat generated by the high-temperature exhaust gas and the combustion of gas in burner 401 to heat the cold water supplied by water supply device 2 into boiler 4. Simultaneously, since the cylinder liner of the internal combustion engine generates heat during operation, the heated water, after being cooled by the cold water supplied by water supply device 5, also enters boiler 4, thus utilizing this heat as well. The amount of cold water supplied to the internal combustion engine accounts for 1-3% of the total cold water supplied to the boiler; in this embodiment, 1% of the boiler's cold water is supplied to the internal combustion engine. Finally, the cold water and the heated water supplied by the internal combustion engine to boiler 4 are heated together to become hot water and output to the external water supply pipeline.

[0105] In other embodiments, the amount of gas consumed by the gas engine 2 accounts for 6%, 8%, 10%, 15% of the total amount of gas consumed by the gas engine and the boiler thermal power supply system, etc.

[0106] In other embodiments, the amount of gas introduced into the reduction device 1 in this embodiment accounts for 6%, 7%, 8% of the total gas consumption of the system, etc., wherein the gas introduced into the first gas inlet 106 accounts for 2%, 4%, 5% of the total gas consumption of the system, etc., and the gas introduced into the second gas inlet 107 accounts for 1% 2% of the total gas consumption of the system, etc., and the amount of air introduced is 12%, 14%, 15% of the total air required by the boiler 4, etc.

[0107] In other embodiments, the amount of cold water supplied to the gas-fired power unit 2 may also account for 2% or 3% of the amount of cold water supplied to the boiler 4.

[0108] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A reduction device for reducing waste gas, characterized in that, include: The housing (101) and a first cavity (102), a second cavity (103) and a third cavity (104) disposed within the housing (101) and connected in sequence, wherein the first cavity (102) has an exhaust gas inlet (105) and a first gas gas inlet (106), and the third cavity (104) has a second gas gas inlet (107) and an exhaust gas outlet (108); the exhaust gas inlet (105) is adapted to communicate with the exhaust gas outlet of the gas power engine (2), and the exhaust gas outlet (108) is adapted to communicate with the inlet of the burner (401) disposed on the boiler (4); The first gas inlet (106) is disposed between the first cavity (102) and the second cavity (103), and is inclined toward the first cavity (102). Gas is injected into the first cavity (102) through the first gas inlet (106); the second gas inlet (107) is disposed between the second cavity (103) and the third cavity (104), and is inclined toward the third cavity (104). Gas is injected into the third cavity (104) through the second gas inlet (107); An ignition device is provided in the second cavity (103); The gas is natural gas; The first cavity (102) is used to premix exhaust gas and fuel gas to form an exhaust gas-fuel mixture; The second cavity (103) is used to burn the waste gas mixture in the first cavity (102) to consume the oxygen therein and to heat the waste gas mixture into high-temperature waste gas; The third chamber (104) is used to mix high-temperature exhaust gas with fuel gas and carry out a reduction reaction to reduce nitrogen oxides.

2. The reduction apparatus according to claim 1, characterized in that, The acute angle between the injection direction of the first gas inlet (106) and the axial direction of the housing (101) is [30°, 45°]; the acute angle between the injection direction of the second gas inlet (107) and the axial direction of the housing (101) is [45°, 60°].

3. The reduction apparatus according to claim 1, characterized in that, The length of the first cavity (102) is [20%, 25%] of the length of the shell (101), the length of the second cavity (103) is [25%, 30%] of the length of the shell (101), and the length of the third cavity (104) is [45%, 55%] of the length of the shell (101).

4. The reduction apparatus according to claim 1, characterized in that, The number of the first gas inlets (106) is at least four, and they are arranged circumferentially along the inner wall of the housing (101); the number of the second gas inlets (107) is at least four, and they are arranged circumferentially along the inner wall of the housing (101).

5. The reduction apparatus according to claim 1, characterized in that, The outer wall and the inner wall of the housing (101) have a cavity (109).

6. The reduction apparatus according to claim 5, characterized in that, The cavity (109) has an air inlet (1010).

7. The reduction apparatus according to any one of claims 1-6, characterized in that, The number of exhaust gas outlets (108) is multiple, and they are arranged at intervals along the circumference of the housing (101).

8. A reduction method for the reduction apparatus according to any one of claims 1-7, characterized in that, include: After the exhaust gas and fuel gas are mixed in the first chamber (102) to form an exhaust gas-fuel mixture, they enter the second chamber (103). The waste gas mixture is burned in the second chamber (103), exhausting the oxygen in the waste gas mixture. The waste gas mixture is heated to above 800°C and becomes high-temperature waste gas, which then enters the third chamber (104). The high-temperature exhaust gas comes into contact with the fuel gas, reducing the nitrogen oxides in the high-temperature exhaust gas; The high-temperature exhaust gas is discharged after reduction treatment.

9. A gas-fired power engine and boiler thermal power supply system, characterized in that, The device includes the reduction apparatus (1) according to any one of claims 1-7, and further includes a gas engine (2), a power generation device (3) and a boiler (4). The power output end of the gas engine (2) is connected to the power input end of the power generation device (3). The exhaust port of the gas engine (2) is connected to the exhaust port (105) of the reduction apparatus (1). The boiler (4) is equipped with a burner (401). The inlet of the burner (401) is connected to the exhaust port (108) of the reduction apparatus (1).

10. The gas-fired power engine and boiler thermal power supply system according to claim 9, characterized in that, It also includes a water supply device (5), the outlet of which is connected to the inlet of the gas engine and the inlet of the boiler.

11. The gas-fired power engine and boiler thermal power supply system according to claim 10, characterized in that, A first control valve (6) is installed on the pipeline between the water outlet of the water supply device and the water inlet of the gas power engine, and a second control valve (7) is installed on the pipeline between the water outlet of the water supply device and the water inlet of the boiler.

12. The gas-fired power engine and boiler thermal power supply system according to claim 10, characterized in that, The outlet of the gas-fired power unit is connected to the inlet of the boiler.

13. The gas-fired power engine and boiler thermal power supply system according to claim 12, characterized in that, A third control valve (8) is installed on the pipeline between the outlet of the gas engine and the inlet of the boiler.

14. The gas-fired power engine and boiler thermal power supply system according to claim 9, characterized in that, It also includes an induced draft fan (9) and an expelled draft fan (10). The air inlet of the expelled draft fan is connected to the atmosphere. The air outlet of the expelled draft fan is connected to the air inlet (1010) on the shell (101) of the reduction device (1) and the air inlet of the burner. The boiler exhaust port is connected to the air inlet of the induced draft fan. The air outlet of the induced draft fan is connected to the atmosphere.

15. The gas-fired power engine and boiler thermal power supply system according to claim 9, characterized in that, It also includes a gas supply pipeline (11), which is connected to the gas inlet of the gas engine, the first gas inlet (106) and the second gas inlet (107) of the reduction device (1) and the gas inlet of the burner.

16. The gas-fired power engine and boiler thermal power supply system according to claim 9, characterized in that, The power output terminal of the power generation device (3) is connected to at least one of the power input terminals of the water supply device (5), the induced draft fan (9), and the blower (10).

17. A method for supplying heat and electricity to a gas-fired power engine and boiler, characterized in that, The gas-fired power engine and boiler thermal power supply system according to any one of claims 9-16 includes the following steps: The gas-powered motor (2) drives the power generation device (3) to generate electricity. The power generation device (3) supplies power to at least one of the blower (10), the induced draft fan (9), and the water supply device (5). The water supply device (5) supplies cold water to the gas-powered motor (2) and the boiler (4). The exhaust gas discharged from the gas engine (2) passes through the reduction device (1); The high-temperature exhaust gas after being treated by the reduction device (1) enters the boiler (4); The boiler (4) heats cold water into hot water and outputs it to the outside.

18. The gas-fired power plant and boiler heat and power supply method according to claim 17, characterized in that, The power generation device (3) also supplies power to the external power system.

19. The gas-fired power engine and boiler heat and power supply method according to claim 17, characterized in that, The gas engine (2) is an internal combustion engine, and the amount of gas consumed by the internal combustion engine accounts for [5%, 15%] of the total amount of gas consumed by the gas engine and the boiler heat and power supply system.

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