Dual fuel high temperature heat source

Abstract

The application provides a dual-fuel high-temperature heat source, and belongs to the technical field of heat science. The outside is connected with a low-grade fuel channel and a boiler, and the outside is also connected with an air channel and the boiler through a heat source regenerator; the boiler is also connected with a gas channel and the outside through the heat source regenerator; the outside is also connected with a high-grade fuel channel and a second boiler, and the outside is also connected with an air channel and the second boiler through a second heat source regenerator; the second boiler is also connected with a gas channel and the outside through the second heat source regenerator; the outside is connected with a heated medium channel and the second boiler, and the second boiler is also connected with the outside through a heated medium channel, thereby forming the dual-fuel high-temperature heat source.

Description

Technical fields:

[0001] This invention belongs to the field of thermal science and technology. Background technology:

[0002] Cold demand, heat demand, and power demand are common in human life and production. Among them, the primary step in the production and utilization of cold, heat, and power is to burn fossil fuels and biomass fuels of different qualities to form a high-temperature heat source. Reducing the irreversible temperature loss during the formation of the high-temperature heat source is the key and primary step in achieving efficient energy utilization.

[0003] Fuels come in different types and have different properties. The temperature at which fuel combustion forms gas directly affects the subsequent production and utilization of cooling, heating, and power. From the perspective of the gas temperature formed by combustion (such as constant pressure combustion temperature), high-grade fuels with high constant pressure combustion temperatures correspond to high-grade heat sources, which can convert more mechanical energy, achieve better cooling efficiency, or provide higher-grade heat energy. On the other hand, low-grade fuels with low constant pressure combustion temperatures are difficult to form high-temperature combustion products, corresponding to low-grade heat sources. Compared to the former, they can convert less mechanical energy, achieve lower cooling efficiency, or provide lower-grade heat energy.

[0004] Furthermore, due to limitations in working principles, material properties, or the manufacturing level of heat exchange equipment, when using high-grade fuels to form a high-temperature heat source, the temperature difference between the combustion medium (such as air) and the fuel's constant-pressure combustion temperature is significant. This results in substantial irreversible temperature losses during combustion, leading to a loss of fuel quality. Another issue related to current technology is that, comparing different types of fuels capable of generating sufficiently high combustion temperatures, such as high-quality coal and natural gas, in heat conversion devices, coal cannot be directly used as the working medium under current technological conditions. Instead, the high-temperature heat load needs to be cooled and transferred to the working medium (such as steam)—this reduces the heat conversion efficiency.

[0005] People need a simple, proactive, safe, and efficient way to use fuels to form high-temperature heat sources. This invention provides a dual-fuel high-temperature heat source that rationally combines low-grade fuels with high-grade fuels to achieve complementary advantages and reduce the utilization value of both fuels, thereby reducing greenhouse gas emissions and effectively lowering fuel costs. Summary of the Invention:

[0006] The main objective of this invention is to provide a dual-fuel high-temperature heat source. The specific contents of the invention are described in detail below:

[0007] 1. A dual-fuel high-temperature heat source mainly consists of a boiler, a second boiler, a heat source regenerator, and a second heat source regenerator. Externally, there is a low-grade fuel channel connecting to the boiler, and an external air channel connecting to the boiler via the heat source regenerator. The boiler also has a gas channel connecting to the outside via the heat source regenerator. Externally, there is a high-grade fuel channel connecting to the second boiler, and an external air channel connecting to the second boiler via the second heat source regenerator and the boiler. The second boiler also has a gas channel connecting to the outside via the second heat source regenerator. The second boiler also has a channel for the heated working fluid connecting to the outside, thus forming a dual-fuel high-temperature heat source.

[0008] 2. The dual-fuel high-temperature heat source mainly consists of a boiler, a second boiler, and a heat source regenerator. It has an external low-grade fuel channel connected to the boiler, and an external air channel connected to the heat source regenerator, which then splits into two paths: the first path directly connects to the boiler, and the second path connects to the second boiler via the boiler. The boiler also has a gas channel connected to the outside via the heat source regenerator, and an external high-grade fuel channel connected to the second boiler. The second boiler also has a gas channel connected to the outside via the heat source regenerator. The second boiler also has a channel for the heated working fluid connected to the outside, forming a dual-fuel high-temperature heat source.

[0009] 3. The dual-fuel high-temperature heat source mainly consists of a boiler, a second boiler, a heat source regenerator, and a second heat source regenerator. Externally, there is a low-grade fuel channel connecting to the boiler, and an external air channel connecting to the boiler via the heat source regenerator. The boiler also has a gas channel connecting to the outside via the heat source regenerator. Externally, there is a high-grade fuel channel connecting to the second boiler, and an external air channel connecting to the second boiler via the second heat source regenerator and the boiler. The second boiler also has a gas channel connecting to the outside via the second heat source regenerator. Externally, there is a channel for the heated working fluid connecting to the boiler and the second boiler, and then the second boiler has a channel for the heated working fluid connecting to the outside, thus forming a dual-fuel high-temperature heat source.

[0010] 4. The dual-fuel high-temperature heat source mainly consists of a boiler, a second boiler, and a heat source regenerator. Externally, there is a low-grade fuel channel connecting to the boiler, and an external air channel connecting to the heat source regenerator, after which the fuel splits into two paths: the first path directly connects to the boiler, and the second path connects to the second boiler via the boiler. The boiler also has a gas channel connecting to the outside via the heat source regenerator, and externally, there is a high-grade fuel channel connecting to the second boiler. The second boiler also has a gas channel connecting to the outside via the heat source regenerator. Externally, there is a channel for the heated working fluid connecting to the boiler and the second boiler, and the second boiler then has a channel for the heated working fluid connecting to the outside, thus forming a dual-fuel high-temperature heat source.

[0011] 5. The dual-fuel high-temperature heat source mainly consists of a boiler, a second boiler, and a heat source regenerator. It has an external low-grade fuel channel connected to the boiler, and an external air channel connected to the heat source regenerator, after which it splits into two paths—the first path connects to the boiler, and the second path connects to the second boiler via the boiler. The boiler also has an initial gas passage connected to the second boiler, and an external high-grade fuel channel connects to the second boiler. The second boiler also has a gas passage connected to the outside via the heat source regenerator. The second boiler also has a channel for the heated working fluid connected to the outside, forming a dual-fuel high-temperature heat source.

[0012] 6. The dual-fuel high-temperature heat source mainly consists of a boiler, a second boiler, and a heat source regenerator. It has an external low-grade fuel channel connected to the boiler, an external air channel connected to the boiler via the heat source regenerator, an initial gas channel connected to the second boiler, an external high-grade fuel channel connected to the second boiler, a gas channel connected to the outside via the heat source regenerator, and a channel for the heated working medium connected to the outside, thus forming a dual-fuel high-temperature heat source.

[0013] 7. The dual-fuel high-temperature heat source mainly consists of a boiler, a second boiler, and a heat source regenerator. Externally, there is a low-grade fuel channel connecting to the boiler, and an external air channel connecting to the heat source regenerator, after which the fuel splits into two paths—the first path connects to the boiler, and the second path connects to the second boiler via the boiler. The boiler also has an initial gas passage connecting to the second boiler, and externally, there is a high-grade fuel channel connecting to the second boiler. The second boiler also has a gas passage connecting to the outside via the heat source regenerator. Externally, there is a channel for the heated working fluid connecting to the boiler and the second boiler, and then the second boiler has another channel for the heated working fluid connecting to the outside, thus forming a dual-fuel high-temperature heat source.

[0014] 8. The dual-fuel high-temperature heat source mainly consists of a boiler, a second boiler, and a heat source regenerator. It has an external low-grade fuel channel connected to the boiler, an external air channel connected to the boiler via the heat source regenerator, an initial gas channel connected to the second boiler, an external high-grade fuel channel connected to the second boiler, and a gas channel connected to the outside via the heat source regenerator. An external channel for the heated working medium connects to the boiler and the second boiler, and the second boiler then has a channel for the heated working medium connected to the outside, thus forming a dual-fuel high-temperature heat source.

[0015] 9. The dual-fuel high-temperature heat source mainly consists of an air heater, a combustion chamber, and a heat source regenerator. There is a low-grade fuel connected to the air heater externally, and an air passage connected to the air heater via the heat source regenerator. The air heater also has a gas passage connected to the outside via the heat source regenerator. There is an air passage connected to the combustion chamber externally, and a high-grade fuel passage connected to the combustion chamber externally. The combustion chamber also has a gas passage connected to the outside, forming a dual-fuel high-temperature heat source.

[0016] 10. The dual-fuel high-temperature heat source is mainly composed of a primary combustion chamber and a secondary combustion chamber. The primary combustion chamber is connected to the external low-grade fuel, and the primary combustion chamber is connected to the external air passages directly and indirectly to the secondary combustion chamber. The primary combustion chamber is also connected to the secondary combustion chamber via a primary gas passage. The secondary combustion chamber is also connected to the external high-grade fuel passage. The secondary combustion chamber is also connected to the external gas passage, thus forming a dual-fuel high-temperature heat source.

[0017] 11. The dual-fuel high-temperature heat source is mainly composed of a primary combustion chamber and a secondary combustion chamber. The primary combustion chamber is connected to the external low-grade fuel and an external air passage. The primary combustion chamber is also connected to the secondary combustion chamber via a primary gas passage. The secondary combustion chamber is also connected to the external high-grade fuel passage. The secondary combustion chamber is also connected to the external gas passage, thus forming a dual-fuel high-temperature heat source. Attached image description:

[0018] Figure 1 This is a principle-based thermodynamic system diagram of a dual-fuel high-temperature heat source provided by the present invention.

[0019] Figure 2 This is a second principle thermodynamic system diagram of a dual-fuel high-temperature heat source provided by the present invention.

[0020] Figure 3 This is a third principle thermodynamic system diagram of a dual-fuel high-temperature heat source provided by the present invention.

[0021] Figure 4 This is a schematic diagram of the fourth principle of a dual-fuel high-temperature heat source provided by the present invention.

[0022] Figure 5 This is a fifth principle thermodynamic system diagram of a dual-fuel high-temperature heat source provided by the present invention.

[0023] Figure 6 This is a sixth principle thermodynamic system diagram of a dual-fuel high-temperature heat source provided by the present invention.

[0024] Figure 7 This is the seventh principle thermodynamic system diagram of a dual-fuel high-temperature heat source provided by the present invention.

[0025] Figure 8 This is the eighth principle thermodynamic system diagram of a dual-fuel high-temperature heat source provided by the present invention.

[0026] Figure 9 This is the ninth principle thermodynamic system diagram of a dual-fuel high-temperature heat source provided by the present invention.

[0027] Figure 10This is the tenth principle thermodynamic system diagram of a dual-fuel high-temperature heat source provided by the present invention.

[0028] Figure 11 This is the 11th principle thermodynamic system diagram of a dual-fuel high-temperature heat source provided by the present invention.

[0029] In the diagram, 1-boiler, 2-second boiler, 3-heat source regenerator, 4-second heat source regenerator, 5-air heater, 6-combustion chamber, 7-initial combustion chamber, 8-secondary combustion chamber.

[0030] (1) Explanation of Boiler 1 and Boiler 2:

[0031] ① The heat source regenerator involves the temperature grade of the gas (i.e., heat source) inside the boiler and is listed separately.

[0032] ② As needed, relevant heat exchangers (heat exchange tube bundles) will be installed inside boiler 1 and boiler 2. For example, when the high-temperature heat source is used to produce steam or for steam power plants, economizers, evaporators and reheaters may be options.

[0033] ③ Instead of specifying the specific heat exchange tube bundles (economizer, evaporator or reheater) involved when the heated working medium flows through the boiler, the boiler is used as the general term.

[0034] ④ In this invention application, boiler 1 is responsible for heating the air entering the second boiler 2; in some cases, it is also responsible for heating the working medium being heated.

[0035] (2) Explanation regarding fuel:

[0036] ① Low-grade fuels: These refer to fuels whose combustion products can generate a relatively low maximum temperature (such as adiabatic combustion temperature or isobaric combustion temperature), such as biomass pellets, coal gangue, coal slime, and combustible waste. From the perspective of heat source, low-grade fuels refer to fuels whose combustion products are difficult to form a high-temperature heat source.

[0037] ② High-grade fuels: These refer to fuels whose combustion products can generate relatively high maximum temperatures (such as adiabatic combustion temperature or isobaric combustion temperature), such as biomass oil, high-quality coal, natural gas, methane, and hydrogen. From the perspective of heat source, high-grade fuels refer to fuels whose combustion products can generate high-temperature heat sources.

[0038] The fuel formed by blending some low-grade fuel into high-grade fuel has a higher maximum temperature (such as adiabatic combustion temperature or constant pressure combustion temperature) that its combustion products can achieve than that of the low-grade fuel; in comparison, this fuel is a high-grade fuel. It should be noted that the high-temperature heat source formed by this fuel still needs to meet the requirements of the thermodynamic cycle.

[0039] ③ In terms of the efficiency of achieving thermal conversion: Taking high-quality coal and natural gas as examples, under current technological conditions, the combustion products of natural gas can be directly used as the working fluid in the cycle, while the combustion products of high-quality coal cannot be directly used as the working fluid in the cycle—this is equivalent to lowering the temperature of the combustion products of high-quality coal; at this time, high-quality coal is a low-grade fuel, and natural gas is a high-grade fuel.

[0040] ④ For the same type of fuel, a high-temperature heat source is constructed using the technical measures described in the claims of this invention. The boiler 1, air heater 5, and primary combustion chamber 7 undertake the task of heating the combustion aid (such as air), which will increase the temperature of the combustion products (high-temperature heat source) formed by the fuel. For low-grade fuel, the same type of fuel put into the second boiler 2, combustion chamber 6, and secondary combustion chamber 8 will be transformed into (like) high-grade fuel.

[0041] ⑤ For solid fuels, the gaseous substances of combustion products are the core of the heat source and an important part of the thermal system; while the solid substances in the combustion products, such as waste residue, contain thermal energy which is utilized (the utilization process and equipment are included in the boiler, or the air is preheated outside the boiler body) and then discharged. They are not listed separately, and their role is not described separately.

[0042] ⑥ Due to limitations in current technology or material properties, especially for fuels that require indirect means to provide high-temperature heat loads to the circulating working medium, their grade should be classified by the highest temperature that the combustion products can reach minus the indirect heat transfer temperature difference; or, by the temperature that the circulating working medium can reach under current technology conditions—fuels that can reach higher temperatures are high-grade fuels, and fuels that can reach lower temperatures are low-grade fuels.

[0043] (3) Statement regarding initial gas supply:

[0044] Primary combustion gas refers to the combustion products formed by the combustion of air and low-grade fuel in boiler 1 or primary combustion chamber 7. Depending on whether air required for the combustion of high-grade fuel is reserved in the primary combustion gas, there are three possibilities:

[0045] ① The initial stage of gas combustion does not include the air required for the combustion of high-grade fuel in the second boiler. Figure 5 , 7 As shown; does not include the air required for the combustion of high-grade fuel in the second-stage combustion chamber 8. Figure 10 As shown.

[0046] ②The initial stage of gas contains a portion of the air required for the combustion of high-grade fuel in the second boiler 2; Figure 5 , 7As shown; it includes a portion of the air required for the combustion of high-grade fuel in the second-stage combustion chamber 8. Figure 10 As shown.

[0047] ③ The initial stage of the fuel gas contains all or most of the air required for the combustion of high-grade fuel in the second boiler (when the fuel is transported using a small amount of air). Figure 6 , 8 As shown; it contains all or most (when fuel is supplied with a small amount of air) of the air required for the combustion of high-grade fuel in the second-stage combustion chamber 8. Figure 11 As shown. Detailed implementation method:

[0048] First, it should be noted that the structure and process are not repeated unless necessary; obvious processes are not described. The invention will now be described in detail with reference to the accompanying drawings and examples.

[0049] Figure 1 The dual-fuel high-temperature heat source shown is implemented as follows:

[0050] (1) Structurally, it is mainly composed of a boiler, a second boiler, a heat source regenerator, and a second heat source regenerator; there is a low-grade fuel channel connected to the boiler 1 externally, and an air channel connected to the boiler 1 via the heat source regenerator 3 externally. The boiler 1 also has a gas channel connected to the outside via the heat source regenerator 3. There is also a high-grade fuel channel connected to the second boiler 2 externally, and an air channel connected to the second heat source regenerator 4 and the boiler 1 connected to the second boiler 2 externally. The second boiler 2 also has a gas channel connected to the outside via the second heat source regenerator 4, and a heated working medium channel connected to the outside.

[0051] (2) In terms of process, low-grade fuel from the outside enters boiler 1. The first external air flows through heat source regenerator 3 to absorb heat and increase its temperature before entering boiler 1. The low-grade fuel and air are mixed and burned in boiler 1 to form high-temperature gas. The gas in boiler 1 releases heat to the air flowing through it and cools down. Then it flows through heat source regenerator 3 to release heat, cool down, and is discharged to the outside. High-grade fuel from the outside enters second boiler 2. The second external air flows through second heat source regenerator 4 and boiler 1 to gradually absorb heat and increase its temperature before entering second boiler 2. The high-grade fuel and air are mixed and burned in second boiler 2 to form high-temperature gas. The high-temperature gas releases heat to the working medium flowing through it and cools down. Then it flows through second heat source regenerator 4 to release heat, cool down, and is discharged to the outside. Low-grade fuel through boiler 1 and high-grade fuel through second boiler 2 provide heat loads for high-temperature heat sources respectively. The working medium flowing through second boiler 2 obtains high-temperature heat loads, forming a dual-fuel high-temperature heat source.

[0052] Figure 2 The dual-fuel high-temperature heat source shown is implemented as follows:

[0053] (1) Structurally, it is mainly composed of a boiler, a second boiler and a heat source regenerator; there is a low-grade fuel channel connected to the boiler 1 externally, and an air channel connected to the heat source regenerator 3 externally, which is then divided into two paths - the first path is directly connected to the boiler 1 and the second path is connected to the second boiler 2 via the boiler 1. The boiler 1 also has a gas channel connected to the outside via the heat source regenerator 3, and there is a high-grade fuel channel connected to the second boiler 2 externally. The second boiler 2 also has a gas channel connected to the outside via the heat source regenerator 3, and the second boiler 2 also has a heated working medium channel connected to the outside.

[0054] (2) In terms of process, external air flows through the heat source regenerator 3 to absorb heat and increase its temperature, and then splits into two paths—the first path enters the boiler 1 to participate in the combustion process, and the second path flows through the boiler 1 to absorb heat and increase its temperature before entering the second boiler 2; external low-grade fuel enters the boiler 1, and the low-grade fuel and air are mixed and burned in the boiler 1 to form high-temperature gas. The gas in the boiler 1 releases heat to the air flowing through it and cools down, and then flows through the heat source regenerator 3 to release heat, cool down and be discharged to the outside; external high-grade fuel enters the second boiler 2, and the high-grade fuel and air are mixed and burned in the second boiler 2 to form high-temperature gas. The high-temperature gas releases heat to the working medium being heated that flows through it and cools down, and then flows through the heat source regenerator 3 to release heat, cool down and be discharged to the outside; low-grade fuel through the boiler 1 and high-grade fuel through the second boiler 2 respectively provide heat load for the high-temperature heat source, and the working medium being heated flows through the second boiler 2 to obtain high-temperature heat load, forming a dual-fuel high-temperature heat source.

[0055] Figure 3 The dual-fuel high-temperature heat source shown is implemented as follows:

[0056] (1) Structurally, it is mainly composed of a boiler, a second boiler, a heat source regenerator, and a second heat source regenerator; there is a low-grade fuel channel connected to the boiler 1 externally, and an air channel connected to the boiler 1 via the heat source regenerator 3 externally. The boiler 1 also has a gas channel connected to the outside via the heat source regenerator 3. There is also a high-grade fuel channel connected to the second boiler 2 externally, and an air channel connected to the second heat source regenerator 4 and the boiler 1 connected to the second boiler 2 externally. The second boiler 2 also has a gas channel connected to the outside via the second heat source regenerator 4 externally. There is a heated working medium channel connected to the second boiler 2 externally via the boiler 1, and then the second boiler 2 has a heated working medium channel connected to the outside.

[0057] (2) In terms of process, low-grade fuel from the outside enters boiler 1. The first external air flows through the heat source regenerator 3 to absorb heat and increase its temperature before entering boiler 1. The low-grade fuel and air mix and burn in boiler 1 to form high-temperature gas. The gas in boiler 1 releases heat to the air and the heated working medium flowing through it and cools down. Then it flows through the heat source regenerator 3 to release heat, cool down, and be discharged to the outside. High-grade fuel from the outside enters the second boiler 2. The second external air flows through the second heat source regenerator 4 and boiler 1 to gradually absorb heat and increase its temperature before entering the second boiler 2. The high-grade fuel and air mix and burn in the second boiler 2 to form high-temperature gas. The high-temperature gas releases heat to the heated working medium flowing through it and cools down. Then it flows through the second heat source regenerator 4 to release heat, cool down, and be discharged to the outside. Low-grade fuel through boiler 1 and high-grade fuel through the second boiler 2 provide heat loads for the high-temperature heat source, respectively. The heated working medium flows through boiler 1 and the second boiler 2 to gradually obtain high-temperature heat loads, forming a dual-fuel high-temperature heat source.

[0058] Figure 4 The dual-fuel high-temperature heat source shown is implemented as follows:

[0059] (1) Structurally, it is mainly composed of a boiler, a second boiler and a heat source regenerator; there is a low-grade fuel channel connected to the boiler 1 externally, and an air channel connected to the heat source regenerator 3 externally, which is then divided into two paths - the first path is directly connected to the boiler 1 and the second path is connected to the second boiler 2 via the boiler 1. The boiler 1 also has a gas channel connected to the outside via the heat source regenerator 3 externally, and there is a high-grade fuel channel connected to the second boiler 2 externally. The second boiler 2 also has a gas channel connected to the outside via the heat source regenerator 3 externally, and there is a heated working medium channel connected to the second boiler 2 externally via the boiler 1. After that, the second boiler 2 has a heated working medium channel connected to the outside.

[0060] (2) In terms of process, external air flows through the heat source regenerator 3 to absorb heat and increase its temperature, and then splits into two paths - the first path enters the boiler 1 to participate in the combustion process, and the second path flows through the boiler 1 to absorb heat and increase its temperature before entering the second boiler 2; external low-grade fuel enters the boiler 1, and the low-grade fuel and air are mixed and burned in the boiler 1 to form high-temperature gas. The gas in the boiler 1 releases heat to the air and the heated working medium flowing through it and cools down, and then flows through the heat source regenerator 3 to release heat, cool down and be discharged to the outside; external high-grade fuel enters the second boiler 2, and the high-grade fuel and air are mixed and burned in the second boiler 2 to form high-temperature gas. The high-temperature gas releases heat to the heated working medium flowing through it and cools down, and then flows through the heat source regenerator 3 to release heat, cool down and be discharged to the outside; low-grade fuel through the boiler 1 and high-grade fuel through the second boiler 2 respectively provide heat load for the high-temperature heat source, and the heated working medium gradually obtains high-temperature heat load by flowing through the boiler 1 and the second boiler 2, forming a dual-fuel high-temperature heat source.

[0061] Figure 5 The dual-fuel high-temperature heat source shown is implemented as follows:

[0062] (1) Structurally, it is mainly composed of a boiler, a second boiler and a heat source regenerator; there is a low-grade fuel channel connected to the boiler 1 externally, and an air channel connected to the heat source regenerator 3 externally, which is then divided into two paths - the first path is connected to the boiler 1 and the second path is connected to the second boiler 2 via the boiler 1. The boiler 1 also has a primary gas channel connected to the second boiler 2 externally, and a high-grade fuel channel connected to the second boiler 2 externally. The second boiler 2 also has a gas channel connected to the outside via the heat source regenerator 3, and the second boiler 2 also has a heated working medium channel connected to the outside.

[0063] (2) In terms of process, after the external air flows through the heat source regenerator 3 to absorb heat and increase its temperature, it is divided into two paths - the first path directly enters the boiler 1 to participate in the combustion process, and the second path flows through the boiler 1 to continue to absorb heat and increase its temperature before entering the second boiler 2; external low-grade fuel enters the boiler 1, and the low-grade fuel and air are mixed and burned in the boiler 1 to form a high-temperature primary gas. The primary gas releases heat to the air flowing through it before entering the second boiler 2; external high-grade fuel enters the second boiler 2, and the high-grade fuel mixes with the primary gas from the boiler 1 and air and burns to form a high-temperature gas. The high-temperature gas releases heat to the working medium flowing through it and cools it down, and then flows through the heat source regenerator 3 to release heat, cool down and be discharged to the outside; the low-grade fuel through the boiler 1 and the high-grade fuel through the second boiler 2 provide heat loads for the high-temperature heat source respectively, and the working medium flowing through the second boiler 2 obtains high-temperature heat loads, forming a dual-fuel high-temperature heat source.

[0064] Figure 6 The dual-fuel high-temperature heat source shown is implemented as follows:

[0065] (1) Structurally, it is mainly composed of a boiler, a second boiler and a heat source regenerator; there is a low-grade fuel channel connected to the boiler 1 externally, and an air channel connected to the boiler 1 via the heat source regenerator 3 externally. The boiler 1 also has a primary gas channel connected to the second boiler 2 externally, and a high-grade fuel channel connected to the second boiler 2 externally. The second boiler 2 also has a gas channel connected to the outside via the heat source regenerator 3, and a heated working medium channel connected to the outside.

[0066] (2) In terms of process, external air flows through the heat source regenerator 3 to absorb heat and increase its temperature before entering the boiler 1. External low-grade fuel enters the boiler 1. The low-grade fuel and air are mixed and burned in the boiler 1 to form a high-temperature primary gas. The primary gas enters the second boiler 2. External high-grade fuel enters the second boiler 2. The high-grade fuel is mixed with the air-rich primary gas from the boiler 1 and burned to form a high-temperature gas. The high-temperature gas releases heat to the working medium flowing through it and cools it down. Then it flows through the heat source regenerator 3 to release heat, cool down, and be discharged to the outside. The low-grade fuel through the boiler 1 and the high-grade fuel through the second boiler 2 provide heat loads for the high-temperature heat source, respectively. The working medium flowing through the second boiler 2 obtains a high-temperature heat load, forming a dual-fuel high-temperature heat source.

[0067] Figure 7 The dual-fuel high-temperature heat source shown is implemented as follows:

[0068] (1) Structurally, it is mainly composed of a boiler, a second boiler and a heat source regenerator; there is a low-grade fuel channel connected to the boiler 1 externally, and an air channel connected to the heat source regenerator 3 externally, which is then divided into two paths - the first path is connected to the boiler 1 and the second path is connected to the second boiler 2 via the boiler 1. The boiler 1 also has a primary gas channel connected to the second boiler 2 externally, and a high-grade fuel channel connected to the second boiler 2 externally. The second boiler 2 also has a gas channel connected to the outside via the heat source regenerator 3. There is a heated working medium channel connected to the second boiler 2 externally via the boiler 1, and then the second boiler 2 has a heated working medium channel connected to the outside.

[0069] (2) In terms of process, after the external air flows through the heat source regenerator 3 to absorb heat and increase its temperature, it is divided into two paths - the first path directly enters the boiler 1 to participate in the combustion process, and the second path flows through the boiler 1 to continue to absorb heat and increase its temperature before entering the second boiler 2; external low-grade fuel enters the boiler 1, and the low-grade fuel and air are mixed and burned in the boiler 1 to form a high-temperature primary gas. The primary gas releases heat to the air and the heated working medium flowing through it before entering the second boiler 2; external high-grade fuel enters the second boiler 2, and the high-grade fuel mixes with the primary gas and air from the boiler 1 and burns to form a high-temperature gas. The high-temperature gas releases heat to the heated working medium flowing through it and cools it down. Then it flows through the heat source regenerator 3 to release heat, cool down and be discharged to the outside; the low-grade fuel through the boiler 1 and the high-grade fuel through the second boiler 2 provide heat loads for the high-temperature heat source respectively. The heated working medium flows through the boiler 1 and the second boiler 2 to gradually obtain high-temperature heat loads, forming a dual-fuel high-temperature heat source.

[0070] Figure 8 The dual-fuel high-temperature heat source shown is implemented as follows:

[0071] (1) Structurally, it is mainly composed of a boiler, a second boiler and a heat source regenerator; there is a low-grade fuel channel connected to the boiler 1 externally, and an air channel connected to the boiler 1 via the heat source regenerator 3 externally. The boiler 1 also has a primary gas channel connected to the second boiler 2 externally, and a high-grade fuel channel connected to the second boiler 2 externally. The second boiler 2 also has a gas channel connected to the outside via the heat source regenerator 3 externally, and a heated working medium channel connected to the second boiler 2 externally via the boiler 1. After the second boiler 2 is connected to the outside again, it has a heated working medium channel connected to the outside.

[0072] (2) In terms of process, external air flows through the heat source regenerator 3 to absorb heat and increase its temperature before entering the boiler 1. External low-grade fuel enters the boiler 1. The low-grade fuel and air are mixed and burned in the boiler 1 to form a high-temperature primary gas. The primary gas releases heat to the working medium flowing through it before entering the second boiler 2. External high-grade fuel enters the second boiler 2. The high-grade fuel mixes with the air-rich primary gas from the boiler 1 and burns to form a high-temperature gas. The high-temperature gas releases heat to the working medium flowing through it and cools it down. Then it flows through the heat source regenerator 3 to release heat, cool down, and be discharged to the outside. The low-grade fuel provides heat load to the high-temperature heat source through the boiler 1 and the high-grade fuel provides heat load to the high-temperature heat source through the second boiler 2. The working medium flowing through the boiler 1 and the second boiler 2 gradually obtains high-temperature heat load, forming a dual-fuel high-temperature heat source.

[0073] Figure 9 The dual-fuel high-temperature heat source shown is implemented as follows:

[0074] (1) Structurally, it is mainly composed of an air heater, a combustion chamber and a heat source regenerator; there is a low-grade fuel connected to the air heater 5 externally, and there is also an air passage connected to the air heater 5 via the heat source regenerator 3 externally. The air heater 5 also has a gas passage connected to the outside via the heat source regenerator 3 externally. There is also an air passage connected to the combustion chamber 6 externally via the air heater 5 externally, and there is also a high-grade fuel passage connected to the combustion chamber 6 externally. The combustion chamber 6 also has a gas passage connected to the outside.

[0075] (2) In terms of process, the first external air enters the air heater 5 to participate in combustion, and the second external air flows through the air heater 5 to absorb heat and increase temperature before entering the combustion chamber 6 to participate in combustion; the external low-grade fuel enters the air heater 5, and the low-grade fuel and air are mixed and burned in the air heater 5 to form a high-temperature primary gas. The primary gas releases heat to the air flowing through it and cools down, and then flows through the heat source regenerator 3 to release heat, cool down and be discharged to the outside; the external high-grade fuel enters the combustion chamber 6, mixes with the air from the air heater 5 and burns to form a high-temperature gas. The high-temperature gas generated by the combustion chamber 6 is provided to the outside; the low-grade fuel through the air heater 5 and the high-grade fuel through the combustion chamber 6 respectively provide heat load to the high-temperature heat source, and the gas formed in the combustion chamber 6 carries away the high-temperature heat load, forming a dual-fuel high-temperature heat source.

[0076] Figure 10 The dual-fuel high-temperature heat source shown is implemented as follows:

[0077] (1) Structurally, it is mainly composed of a primary combustion chamber and a secondary combustion chamber; there is a low-grade fuel connected to the primary combustion chamber 7 externally, and there are air passages connected directly to the primary combustion chamber 7 and connected to the secondary combustion chamber 8 via the primary combustion chamber 7. The primary combustion chamber 7 also has a primary gas passage connected to the secondary combustion chamber 8 externally, and there is a high-grade fuel passage connected to the secondary combustion chamber 8 externally. The secondary combustion chamber 8 also has a gas passage connected to the outside.

[0078] (2) In terms of process, the external air is divided into two paths - the first path directly enters the primary combustion chamber 7 to participate in combustion, and the second path flows through the primary combustion chamber 7 to absorb heat and increase temperature before entering the secondary combustion chamber 8 to participate in combustion; the external low-grade fuel enters the primary combustion chamber 7, and the low-grade fuel and air are mixed and burned in the primary combustion chamber 7 to form a primary gas with a higher temperature. The primary gas releases heat to the air flowing through it and is then supplied to the secondary combustion chamber 8; the external high-grade fuel enters the secondary combustion chamber 8, mixes with the air and primary gas from the primary combustion chamber 7 and is burned to form a high-temperature gas. The high-temperature gas generated by the secondary combustion chamber 8 is supplied to the outside; the low-grade fuel through the primary combustion chamber 7 and the high-grade fuel through the secondary combustion chamber 8 respectively provide heat load to the high-temperature heat source. The gas formed in the secondary combustion chamber 8 carries away the high-temperature heat load, forming a dual-fuel high-temperature heat source.

[0079] Figure 11 The dual-fuel high-temperature heat source shown is implemented as follows:

[0080] (1) Structurally, it is mainly composed of a primary combustion chamber and a secondary combustion chamber; the primary combustion chamber 7 is connected to the external low-grade fuel, the primary combustion chamber 7 is connected to the external air passage, the primary combustion chamber 7 is also connected to the secondary combustion chamber 8 via a primary gas passage, the secondary combustion chamber 8 is also connected to the external high-grade fuel passage, and the secondary combustion chamber 8 is also connected to the external gas passage.

[0081] (2) In terms of process, external air enters the primary combustion chamber 7, and external low-grade fuel enters the primary combustion chamber 7. The low-grade fuel and air are mixed and burned in the primary combustion chamber 7 to form a primary gas with a high temperature and rich air. The primary gas is supplied to the secondary combustion chamber 8. External high-grade fuel enters the secondary combustion chamber 8, mixes with the primary gas rich in air from the primary combustion chamber 7 and is burned to form a high-temperature gas. The high-temperature gas generated by the secondary combustion chamber 8 is supplied to the outside. The low-grade fuel through the primary combustion chamber 7 and the high-grade fuel through the secondary combustion chamber 8 provide heat loads for the high-temperature heat source respectively. The gas formed in the secondary combustion chamber 8 carries away the high-temperature heat load, forming a dual-fuel high-temperature heat source.

[0082] The effects achievable by this invention—the dual-fuel high-temperature heat source proposed in this invention has the following effects and advantages:

[0083] (1) Reasonable combination and segmented construction effectively reduce the irreversible loss of temperature difference during the formation of high temperature heat source.

[0084] (2) Low-grade fuel and high-grade fuel together form a high-temperature heat source, which significantly improves the energy utilization value of low-grade fuel.

[0085] (3) Low-grade fuel is used to construct high-temperature heat sources in stages, which significantly increases the temperature of high-temperature heat sources and enhances the utilization value of low-grade fuel.

[0086] (4) Reduce the irreversible temperature difference loss of high-grade fuel in the process of forming a high-temperature heat source, and enhance the utilization value of high-grade fuel in forming a high-temperature heat source.

[0087] (5) Reduce greenhouse gas emissions, reduce pollutant emissions, and achieve outstanding energy conservation and emission reduction benefits.

[0088] (6) It has a simple structure, reasonable process, and wide application; it enhances the value of fuel use and reduces the operating cost of high-temperature heat sources.

Claims

1. A dual-fuel high-temperature heat source is mainly composed of a boiler, a second boiler, a heat source regenerator, and a second heat source regenerator. There is a low-grade fuel channel connected to the boiler (1) externally, and an air channel connected to the boiler (1) via the heat source regenerator (3) externally. The boiler (1) also has a gas channel connected to the outside via the heat source regenerator (3). There is also a high-grade fuel channel connected to the second boiler (2) externally, and an air channel connected to the second heat source regenerator (4) and the boiler (1) externally connected to the second boiler (2). The second boiler (2) also has a gas channel connected to the outside via the second heat source regenerator (4) externally, and the second boiler (2) also has a channel for the heated working medium connected to the outside, thus forming a dual-fuel high-temperature heat source.

2. The dual-fuel high-temperature heat source is mainly composed of a boiler, a second boiler, and a heat source regenerator. There is a low-grade fuel channel connected to the boiler (1) and an air channel connected to the heat source regenerator (3). The air channel is then divided into two paths: the first path is directly connected to the boiler (1) and the second path is connected to the second boiler (2) via the boiler (1). The boiler (1) also has a gas channel connected to the outside via the heat source regenerator (3). There is also a high-grade fuel channel connected to the second boiler (2). The second boiler (2) also has a gas channel connected to the outside via the heat source regenerator (3). The second boiler (2) also has a heated working medium channel connected to the outside, forming a dual-fuel high-temperature heat source.

3. The dual-fuel high-temperature heat source is mainly composed of a boiler, a second boiler, a heat source regenerator, and a second heat source regenerator. There is a low-grade fuel channel connected to the boiler (1) externally, and an air channel connected to the boiler (1) via the heat source regenerator (3) externally. The boiler (1) also has a gas channel connected to the outside via the heat source regenerator (3). There is also a high-grade fuel channel connected to the second boiler (2) externally, and an air channel connected to the second heat source regenerator (4) and the boiler (1) externally connected to the second boiler (2). The second boiler (2) also has a gas channel connected to the outside via the second heat source regenerator (4). There is a heated working medium channel connected to the second boiler (2) externally via the boiler (1), and then the second boiler (2) has a heated working medium channel connected to the outside, forming a dual-fuel high-temperature heat source.

4. The dual-fuel high-temperature heat source is mainly composed of a boiler, a second boiler, and a heat source regenerator. There is a low-grade fuel channel connected to the boiler (1) and an air channel connected to the heat source regenerator (3). The air channel is then divided into two paths: the first path is directly connected to the boiler (1) and the second path is connected to the second boiler (2) via the boiler (1). The boiler (1) also has a gas channel connected to the outside via the heat source regenerator (3). There is also a high-grade fuel channel connected to the second boiler (2). The second boiler (2) also has a gas channel connected to the outside via the heat source regenerator (3). There is a heated working medium channel connected to the second boiler (2) via the boiler (1). The second boiler (2) then has a heated working medium channel connected to the outside, forming a dual-fuel high-temperature heat source.

5. The dual-fuel high-temperature heat source is mainly composed of a boiler, a second boiler, and a heat source regenerator. There is a low-grade fuel channel connected to the boiler (1) and an air channel connected to the heat source regenerator (3). The air channel is then divided into two paths: the first path is connected to the boiler (1) and the second path is connected to the second boiler (2) via the boiler (1). The boiler (1) also has a primary gas channel connected to the second boiler (2). There is also a high-grade fuel channel connected to the second boiler (2). The second boiler (2) also has a gas channel connected to the outside via the heat source regenerator (3). The second boiler (2) also has a heated working medium channel connected to the outside, forming a dual-fuel high-temperature heat source.

6. The dual-fuel high-temperature heat source is mainly composed of a boiler, a second boiler and a heat source regenerator. There is a low-grade fuel channel connected to the boiler (1) externally, and an air channel connected to the boiler (1) via the heat source regenerator (3) externally. The boiler (1) also has a primary gas channel connected to the second boiler (2) externally, and a high-grade fuel channel connected to the second boiler (2) externally. The second boiler (2) also has a gas channel connected to the outside via the heat source regenerator (3) externally, and a heated working medium channel connected to the outside, thus forming a dual-fuel high-temperature heat source.

7. The dual-fuel high-temperature heat source is mainly composed of a boiler, a second boiler, and a heat source regenerator. There is a low-grade fuel channel connected to the boiler (1) and an air channel connected to the heat source regenerator (3). The air channel is then divided into two paths: the first path is connected to the boiler (1) and the second path is connected to the second boiler (2) via the boiler (1). The boiler (1) also has a primary gas channel connected to the second boiler (2). There is also a high-grade fuel channel connected to the second boiler (2). The second boiler (2) also has a gas channel connected to the outside via the heat source regenerator (3). There is a heated working medium channel connected to the second boiler (2) via the boiler (1). The second boiler (2) then has a heated working medium channel connected to the outside, forming a dual-fuel high-temperature heat source.

8. The dual-fuel high-temperature heat source is mainly composed of a boiler, a second boiler and a heat source regenerator. There is a low-grade fuel channel connected to the boiler (1) externally, and an air channel connected to the boiler (1) via the heat source regenerator (3) externally. The boiler (1) also has a primary gas channel connected to the second boiler (2) externally, and a high-grade fuel channel connected to the second boiler (2) externally. The second boiler (2) also has a gas channel connected to the outside via the heat source regenerator (3) externally. There is a heated working medium channel connected to the second boiler (2) externally via the boiler (1) and then the second boiler (2) has a heated working medium channel connected to the outside, forming a dual-fuel high-temperature heat source.

9. The dual-fuel high-temperature heat source is mainly composed of an air heater, a combustion chamber and a heat source regenerator. There is a low-grade fuel connected to the air heater (5) externally, and an air channel connected to the air heater (5) externally via the heat source regenerator (3). The air heater (5) also has a gas channel connected to the outside via the heat source regenerator (3). There is an air channel connected to the combustion chamber (6) externally via the air heater (5). There is also a high-grade fuel channel connected to the combustion chamber (6) externally. The combustion chamber (6) also has a gas channel connected to the outside, forming a dual-fuel high-temperature heat source.

10. The dual-fuel high-temperature heat source is mainly composed of a primary combustion chamber and a secondary combustion chamber. The primary combustion chamber (7) is connected to the external low-grade fuel. The primary combustion chamber (7) is directly connected to the primary combustion chamber (7) and connected to the secondary combustion chamber (8) via the primary combustion chamber (7). The primary combustion chamber (7) is also connected to the secondary combustion chamber (8) via a primary gas passage. The secondary combustion chamber (8) is also connected to the external high-grade fuel passage. The secondary combustion chamber (8) is also connected to the external gas passage, thus forming a dual-fuel high-temperature heat source.

11. The dual-fuel high-temperature heat source is mainly composed of a primary combustion chamber and a secondary combustion chamber. The primary combustion chamber (7) is connected to the external low-grade fuel and an external air passage. The primary combustion chamber (7) is also connected to the secondary combustion chamber (8) via a primary gas passage. The secondary combustion chamber (8) is also connected to the external high-grade fuel passage. The secondary combustion chamber (8) is also connected to the external gas passage, thus forming a dual-fuel high-temperature heat source.

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