An integrated molten salt heat exchanger for flue gas purification with a combustion-type design and its working mechanism.

Abstract

An integrated combustion-type flue gas purification molten salt heat exchanger and its working mechanism are disclosed. The invention is characterized by adding a combustion-type device upstream of the flue gas molten salt heat exchanger, which is connected to the molten salt heat exchanger via a flue, forming the integrated combustion-type flue gas molten salt heat exchanger. It includes a combustion-type system or device, a primary flue gas molten salt heat exchange assembly, a flue gas decarbonization assembly, a secondary flue gas molten salt heat exchange assembly, a flue gas denitrification assembly, and a tertiary flue gas molten salt heat exchange assembly. This invention enables more uniform and efficient combustion heat transfer within the flue gas; provides a safer ignition method for combustion-type gases or atomized combustion-type liquid (or gas-powder) mixtures outside the flue; facilitates easier monitoring of combustion; achieves flue gas denitrification and decarbonization purification; and enables complete thermoelectric decoupling in the gas turbine power generation, heating, and energy storage system, allowing the system to autonomously supply power, store heat, or provide heat.

Description

Technical Field

[0001] This invention belongs to the technical field of molten salt equipment, specifically a combustion-type flue gas purification molten salt heat exchange integrated device and its working mechanism. Background Technology

[0002] After some coal-fired power units were shut down, their functions were partially replaced by gas-fired heating boilers and partially by gas-fired power generation and heating systems. Optimization and modification of the basic functions of these gas-fired boilers have led to relatively mature technological solutions such as gas turbine-plus-waste-heat boiler power generation and heating systems, and gas turbine-plus-thermal-storage power generation and heating systems.

[0003] Patent CN 213021144 U discloses a molten salt flue gas heat exchanger, including a shell, a lower end cap, an upper end cap, heat exchange tubes, a lower tube sheet, and an upper tube sheet. While this patented technology can address the problem of intermittent high-temperature flue gas and molten salt heat exchange, it fails to achieve the functions of supplementary combustion and flue gas purification. Patent CN 206973508 U discloses a gas turbine waste heat molten salt thermal storage system, including a molten salt waste heat boiler, a low-temperature molten salt tank, a high-temperature molten salt tank, and a steam generation unit. Although this patented technology uses a molten salt waste heat boiler to recover heat from the high-temperature flue gas discharged from the gas turbine, it also fails to achieve the functions of supplementary combustion and flue gas purification. While this technology possesses heat storage and energy storage capabilities, its thermoelectricity is coupled, meaning the total amount of heat and the total amount of power generation are mutually limited. This means the stored heat cannot exceed the waste heat of the gas turbine flue gas, and it cannot achieve independent external heating or power supply.

[0004] This invention addresses the technical problems existing in the above-mentioned technical solutions. The technical solution implemented not only enables the reuse of waste heat from flue gas after gas turbine power generation, but also achieves complete decoupling of thermoelectricity in the gas turbine power generation, heating, and energy storage system, realizing flue gas purification and autonomous external power supply, heat storage, or heating. Summary of the Invention

[0005] The purpose of this invention patent is to realize the reuse of waste heat from flue gas after gas turbine power generation and the complete decoupling of thermoelectricity in the gas turbine power generation, heating and energy storage system, so as to realize the system's flue gas purification and the functions of autonomous power supply, heat storage or heating.

[0006] The technical solution of the present invention is as follows: A combustion-type integrated flue gas molten salt heat exchanger is characterized by: adding a combustion device upstream of the flue gas molten salt heat exchanger, the combustion device being connected to the flue gas molten salt heat exchanger via a flue to form a combustion-type integrated flue gas molten salt heat exchanger.

[0007] Furthermore, a molten salt heat exchanger integrated device for flue gas purification in a supplementary combustion type is characterized by: including at least one supplementary combustion device (72-2), wherein the supplementary combustion device (72-2) includes at least one first supplementary combustion nozzle (72-2-1-1), a first supplementary combustion branch pipe circuit (72-2-1-2), a first supplementary combustion mixing pipe (72-2-1-3), a first supplementary combustion ignition chamber (72-2-1-4), a first supplementary combustion ignition observation window (72-2-1-5), a first supplementary combustion air pipe (72-2-1-6), a first supplementary combustion air electric valve (72-2-1-7), a first supplementary combustion electric igniter (72-2-1-8), a first supplementary combustion gas pipe (72-2-1-9), a first supplementary combustion gas electric valve (72-2-1-10), and at least one m-th supplementary combustion nozzle. The combustion device (72-2) comprises the following components: nozzle (72-2-m-1), m-th supplementary combustion branch circuit (72-2-m-2), m-th supplementary combustion mixing pipe (72-2-m-3), m-th supplementary combustion ignition chamber (72-2-m-4), m-th supplementary combustion ignition observation window (72-2-m-5), m-th supplementary combustion air pipe (72-2-m-6), m-th supplementary combustion air electric valve (72-2-m-7), m-th supplementary combustion electric igniter (72-2-m-8), m-th supplementary combustion gas pipe (72-2-m-9), and m-th supplementary combustion gas electric valve (72-2-m-10). The combustion device (72-2) consists of m supplementary combustion branch circuits, supplementary combustion mixing pipes, supplementary combustion ignition chambers, supplementary combustion air pipes, supplementary combustion air electric valves, supplementary combustion electric igniters, supplementary combustion gas pipes, and supplementary combustion gas electric valves; where m is a natural number. The axis of the first supplementary combustion branch circuit (72-2-1-2) coincides with the first equal pressure line of flue gas (72-1-1), and the first supplementary combustion branch circuit (72-2-1-2) is a connected circuit; The axis of the first afterburning nozzle (72-2-1-1) is along the flue gas flow direction and perpendicular to the axis of the first afterburning branch circuit (72-2-1-2). The first afterburning nozzle (72-2-1-1) is connected to the first afterburning branch circuit (72-2-1-2). Multiple first afterburning nozzles (72-2-1-1) are evenly arranged along the axis of the first afterburning branch circuit (72-2-1-2). The axis of the first afterburning mixing pipe (72-2-1-3) is connected to the axis of the first afterburning branch pipe circuit (72-2-1-2), and the first afterburning mixing pipe (72-2-1-3) and the first afterburning branch pipe circuit (72-2-1-2) are connected in a continuous manner; The symmetry line of the first afterburning ignition chamber (72-2-1-4) is connected in the same direction as the axis of the first afterburning mixing pipe (72-2-1-3), and the first afterburning ignition chamber (72-2-1-4) and the first afterburning mixing pipe (72-2-1-3) are connected in a through manner; The first afterburning observation window (72-2-1-5) is set on at least one side of the first afterburning chamber (72-2-1-4), and the way and number of the window are set are to facilitate observation of the ignition situation in the first afterburning chamber (72-2-1-4). The axis of the first afterburning air pipe (72-2-1-6) is obliquely connected to the symmetrical line of the first afterburning ignition chamber (72-2-1-4), and the first afterburning air pipe (72-2-1-6) and the first afterburning ignition chamber (72-2-1-4) are obliquely connected; a first afterburning air electric valve (72-2-1-7) is provided on the first afterburning air pipe (72-2-1-6) to control the air flow. The axis of the first supplementary combustion gas pipe (72-2-1-9) is connected in the same direction as the symmetrical line of the first supplementary combustion ignition chamber (72-2-1-4). The first supplementary combustion gas pipe (72-2-1-9) is inserted into the first supplementary combustion ignition chamber (72-2-1-4) for a certain length and then connected to it. The first supplementary combustion gas pipe (72-2-1-9) is equipped with a first supplementary combustion gas electric valve (72-2-1-10) to control the gas flow rate. The first supplementary combustion electric igniter (72-2-1-8) is connected at one end to the wall of the first supplementary combustion gas pipe (72-2-1-9) via a wire, and at the other end is equipped with at least one ignition probe. One end of the ignition probe is connected to the first supplementary combustion electric igniter (72-2-1-8) via a wire, and the other end is not in contact with the opening of the first supplementary combustion gas pipe (72-2-1-9) after it has been inserted into the first supplementary combustion ignition chamber (72-2-1-4) for a certain length. The distance is suitable for generating an electric spark after being energized. The first supplementary combustion electric igniter (72-2-1-8) is equipped with a low-voltage power supply. The axis of the m-th supplementary combustion branch circuit (72-2-m-2) coincides with the m-th isobaric line of the flue gas (72-1-m), and the m-th supplementary combustion branch circuit (72-2-m-2) is a connected circuit; The axis of the m-th afterburning nozzle (72-m-1) is along the flue gas flow direction and perpendicular to the axis of the m-th afterburning branch circuit (72-2-m-2). The m-th afterburning nozzle (2-m-1) is connected to the m-th afterburning branch circuit (72-2-m-2). Multiple m-th afterburning nozzles (72-m-1) are evenly arranged along the axis of the m-th afterburning branch circuit (72-2-m-2). The axis of the m-th supplementary combustion mixing pipe (72-2-m-3) is connected to the axis of the m-th supplementary combustion branch pipe circuit (72-2-m-2), and the m-th supplementary combustion mixing pipe (72-2-m-3) and the m-th supplementary combustion branch pipe circuit (72-2-m-2) are connected in a continuous manner; The symmetry line of the m-th afterburning ignition chamber (72-2-m-4) is connected in the same direction as the axis of the m-th afterburning mixing pipe (72-2-m-3), and the m-th afterburning ignition chamber (72-2-m-4) and the m-th afterburning mixing pipe (72-2-m-3) are connected in a through manner; The m-th afterburning ignition observation window (72-2-m-5) is set on at least one side of the m-th afterburning ignition chamber (72-2-m-4), and the way and number of its setting are based on the need to observe the ignition situation in the m-th afterburning ignition chamber (72-2-m-4); The axis of the m-th supplementary combustion air pipe (72-2-m-6) intersects the symmetry line of the m-th supplementary combustion ignition chamber (72-2-m-4) and is obliquely connected; the m-th supplementary combustion air pipe (72-2-m-6) and the m-th supplementary combustion ignition chamber (72-2-m-4) are obliquely connected; the m-th supplementary combustion air pipe (72-2-m-6) is equipped with an m-th supplementary combustion air electric valve (72-2-m-7) to control the air flow. The axis of the m-th supplementary combustion gas pipe (72-2-m-9) is connected in the same direction as the symmetry line of the m-th supplementary combustion ignition chamber (72-2-m-4). The m-th supplementary combustion gas pipe (72-2-m-9) is inserted into the m-th supplementary combustion ignition chamber (72-2-m-4) for a certain length and then connected to it. The m-th supplementary combustion gas pipe (72-2-m-9) is equipped with an m-th supplementary combustion gas electric valve (72-2-m-10) to control the gas flow rate. The m-th supplementary combustion electric igniter (72-2-m-8) is connected at one end to the wall of the m-th supplementary combustion gas pipe (72-2-m-9) via a wire, and at the other end is equipped with at least one ignition probe. One end of the ignition probe is connected to the m-th supplementary combustion electric igniter (72-2-m-8) via a wire, and the other end is not in contact with the opening of the m-th supplementary combustion gas pipe (72-2-m-9) after it has been inserted into the m-th supplementary combustion ignition chamber (72-2-m-4) for a certain length. The distance is suitable for generating an electric spark after being energized. The m-th supplementary combustion electric igniter (72-2-m-8) is equipped with a low-voltage power supply.

[0008] further, An integrated device for flue gas purification and molten salt heat exchange with a combustion-type combustion type is characterized in that: it includes a flue gas combustion-recharger system (72), wherein the combustion-recharger system (72) includes at least one combustion-recharger device (72-2), at least one combustion-recharger ignition video monitor (72-7), at least one combustion observation window for the combustion-recharger nozzle (72-3), at least one combustion observation video monitor for the combustion-recharger nozzle (72-6), a flue gas temperature and pressure measuring instrument before combustion-recharger (72-4), and a flue gas temperature and pressure measuring instrument after combustion-recharger (72-5); Along the direction of the flue gas, at least one hole is opened on the flue wall downstream of the combustion device (72-2), and a combustion observation window (72-3) for the combustion of the combustion nozzle is embedded in each hole; the combustion observation video monitor (72-6) for the combustion of the combustion nozzle is arranged at a certain position outside the flue, and its position and number are determined so as to be able to observe the combustion of all combustion nozzles. An instrument for measuring the temperature and pressure of flue gas before combustion (72-4) is arranged upstream of the combustion device (72-2), with its probe inserted into the flue through the flue wall in the radial direction of the flue. A flue gas temperature and pressure measuring instrument (72-5) is arranged downstream of the afterburning device (72-2). Its probe passes through the flue wall and is inserted into the flue along the radial direction of the flue. It can be arranged upstream or downstream of the combustion observation window (72-6) of the afterburning nozzle. When it is arranged upstream of the combustion observation window (72-6) of the afterburning nozzle, it should be arranged so as not to affect the observation of the combustion of the afterburning nozzle. The aforementioned afterburning ignition video monitor (72-7) is arranged at a certain position outside the flue. The position and number of the monitor are determined so that the ignition situation inside the afterburning ignition chamber of all afterburning devices can be observed. The combustion nozzle, combustion branch circuit and part of the combustion mixing pipe in the combustion device (72-2) are arranged inside the flue and connected to the inner wall of the flue through a support structure; the combustion mixing pipe in the combustion device passes through the flue wall in the radial direction of the flue.

[0009] Furthermore, a combustion-type flue gas purification molten salt heat exchange integrated device is characterized in that: it includes a combustion-type flue gas molten salt heat exchange denitrification integrated device, wherein the combustion-type flue gas molten salt heat exchange denitrification integrated device includes a combustion system (72) or combustion device (72-2), a primary flue gas molten salt heat exchange component (73-1), an SCR flue gas denitrification component (74) and a tertiary flue gas molten salt heat exchange component (73-3). The afterburner system (72) is connected to the primary flue gas molten salt heat exchange assembly (73-1) via a flue gas pipeline (60); the primary flue gas molten salt heat exchange assembly (73-1) is connected to the SCR flue gas denitrification assembly (74) via a flue gas pipeline (60); the SCR flue gas denitrification assembly (74) is connected to the tertiary flue gas molten salt heat exchange assembly (73-3) via a flue gas pipeline (60). The molten salt inlet of the tertiary flue gas molten salt heat exchanger (73-3) is connected to the molten salt outlet of the low-temperature molten salt storage tank (70-2) via a molten salt pipeline (70-0); the molten salt outlet of the tertiary flue gas molten salt heat exchanger (73-3) is connected to the molten salt inlet of the primary flue gas molten salt heat exchanger (73-1) via a molten salt pipeline (70-0); and the molten salt outlet of the primary flue gas molten salt heat exchanger (73-1) is connected to the molten salt inlet of the high-temperature molten salt storage tank (70-1) via a molten salt pipeline (70-0).

[0010] Furthermore, an integrated device for flue gas purification and molten salt heat exchange with a combustion-type combustion type and its working mechanism are characterized by including a combustion-type combustion system (72) or combustion-type combustion device (72-2), a primary flue gas molten salt heat exchange component (73-1), a flue gas decarbonization component (75), a secondary flue gas molten salt heat exchange component (73-2), an SCR flue gas denitrification component (74), and a tertiary flue gas molten salt heat exchange component (73-3). The burner system (72) is connected to the primary flue gas molten salt heat exchange assembly (73-1) via a flue gas pipeline (60); the primary flue gas molten salt heat exchange assembly (73-1) is connected to the flue gas decarbonization assembly (75) via a flue gas pipeline (60); the flue gas decarbonization assembly (75) is connected to the secondary flue gas molten salt heat exchange assembly (73-2) via a flue gas pipeline (60); the secondary flue gas molten salt heat exchange assembly (73-2) is connected to the SCR flue gas denitrification assembly (74) via a flue gas pipeline (60); the SCR flue gas denitrification assembly (74) is connected to the tertiary flue gas molten salt heat exchange assembly (73-3) via a flue gas pipeline (60); the positions of the SCR flue gas denitrification assembly (74) and the flue gas decarbonization assembly (75) can be interchanged, and the secondary flue gas molten salt heat exchange assembly (73-2) is no longer installed when interchanged. The afterburner system (72) is located near the flue gas inflow point of the afterburner type flue gas molten salt heat exchanger integrated device (71); along the direction of flue gas inflow: the afterburner system (72) is connected to the primary flue gas molten salt heat exchanger assembly (73-1) through the flue gas pipeline (60); the primary flue gas molten salt heat exchanger assembly (73-1) is connected to the flue gas decarbonization assembly (75) through the flue gas pipeline (60); the flue gas decarbonization assembly (75) is connected to the secondary flue gas molten salt heat exchanger assembly (73-2) through the flue gas pipeline (60); the secondary flue gas molten salt heat exchanger assembly (73-2) is connected to the SCR flue gas denitrification assembly (74) through the flue gas pipeline (60); the SCR flue gas denitrification assembly (74) is connected to the tertiary flue gas molten salt heat exchanger assembly (74) through the flue gas pipeline (60). The heat exchange assembly (73-3) is connected; the molten salt inlet of the tertiary flue gas molten salt heat exchange assembly (73-3) is connected to the molten salt outlet of the low-temperature molten salt storage tank (70-2) through the molten salt pipeline (70-0); the molten salt outlet of the tertiary flue gas molten salt heat exchange assembly (73-3) is connected to the molten salt inlet of the secondary flue gas molten salt heat exchange assembly (73-2) through the molten salt pipeline (70-0); the molten salt outlet of the secondary flue gas molten salt heat exchange assembly (73-2) is connected to the molten salt inlet of the primary flue gas molten salt heat exchange assembly (73-1) through the molten salt pipeline (70-0); the molten salt outlet of the primary flue gas molten salt heat exchange assembly (73-1) is connected to the molten salt inlet of the high-temperature molten salt storage tank (70-1) through the molten salt pipeline (70-0).

[0011] Furthermore, a combustion-type flue gas purification molten salt heat exchange integrated device is characterized in that: the first isobaric line (72-1-1) to the m isobaric line (72-1-m) selected at the flue section are evenly distributed at the section; the flue gas pressure is the same on the same isobaric line; the position of the first isobaric line (72-1-1) to the m isobaric line (72-1-m) is obtained by numerical simulation calculation.

[0012] Furthermore, a combustion-type flue gas purification molten salt heat exchange integrated device is characterized in that: the inner contour line (72-1-0) of the flue section can be circular, square or multi-segment closed broken line.

[0013] Furthermore, a molten salt heat exchanger integrated device for flue gas purification in the form of a supplementary combustion type is characterized in that: the gas inside the m-th supplementary combustion gas pipe (72-2-m-9) is a combustible gas, an atomized combustible gas-liquid mixture, an atomized combustible gas-powder mixture, or an atomized combustible gas-liquid-powder mixture.

[0014] Furthermore, a combustion-type flue gas purification molten salt heat exchange integrated device is characterized in that: the internal cross-sectional contour lines of all combustion nozzles in the combustion device (72-2) are hyperbolic.

[0015] Furthermore, a method for operating an integrated flue gas purification molten salt heat exchanger with a combustion-type combustion system is characterized in that: the working process of the internal combustion and external ignition system (72) for the flue gas is as follows: The flue gas first passes through the pre-combustion flue gas temperature and pressure measuring instrument (72-4) upstream of the combustion device (72-2) to measure the pre-combustion flue gas temperature and pressure values. The pre-combustion flue gas temperature and pressure values ​​are then transmitted to the combustion intelligent control system via a transmitter for backup. When the flue gas passes through the combustion device (72-2), it is heated by the combustion device (72-2) and continues to flow downstream; the combustion observation video monitor (72-6) of the combustion nozzle records the combustion status of all nozzles in the combustion device (72-2) through the combustion observation window (72-3), and the video signal is transmitted to the combustion intelligent control system through the video signal line. The result is analyzed and processed by AI technology and stored for later use. After the flue gas is re-burned by the re-burning device (72-2), the flue gas temperature and pressure are measured by the flue gas temperature and pressure measuring instrument (72-5). The flue gas temperature and pressure values ​​are then transmitted to the re-burning intelligent control system via a transmitter for backup. The following data are processed by AI technology: the pre-combustion flue gas temperature and pressure values ​​and the post-combustion flue gas temperature and pressure values ​​are stored in the intelligent combustion control system; the combustion status of all nozzles in the combustion device (72-2) recorded by the combustion observation video monitor (72-6) stored in the intelligent combustion control system is analyzed and processed by AI technology; the ignition status of all combustion chambers in the combustion device (72-2) recorded by the combustion ignition video monitor (72-7) stored in the intelligent combustion control system is analyzed and processed by AI technology; and the relationships between the first combustion air electric valve (72-2-1-7), the first combustion electric igniter (72-2-1-8), the first combustion gas electric valve (72-2-1-10), the m-th combustion air electric valve (72-2-m-7), the m-th combustion electric igniter (72-2-m-8), and the m-th combustion gas electric valve (72-2-m-10) are interlocked, and the control logic is executed by the algorithm in the intelligent combustion control system.

[0016] Furthermore, a method for operating an integrated molten salt heat exchanger for flue gas purification with a supplementary combustion type is characterized in that: when the flue gas requires supplementary combustion, the process from ignition to normal operation of the supplementary combustion device (72-2) is as follows: When the flue gas needs to be supplemented with combustion, the algorithm in the supplementation combustion intelligent control system issues a command to open the first supplementation air electric valve (72-2-1-7) and / or the mth supplementation air electric valve (72-2-m-7), and after 1~2 seconds; The algorithm in the supplementary combustion intelligent control system issues instructions to open the first supplementary combustion electric igniter (72-2-1-8) and the first supplementary combustion gas electric valve (72-2-1-10) simultaneously, and / or the mth supplementary combustion electric igniter (72-2-m-8) and the mth supplementary combustion gas electric valve (72-2-m-10) simultaneously; At this time, the mixture in the first supplementary combustion ignition observation window (72-2-1-5) and / or the mth supplementary combustion ignition observation window (72-2-m-5) can be observed to have been ignited. This ignition video information is recorded by the supplementary combustion ignition video monitor (72-7) and then transmitted to the supplementary combustion intelligent control system for storage. The video information of the ignition status of all supplementary combustion ignition chambers in the supplementary combustion device (72-2) is analyzed and processed by AI technology, and the result is the value representing the ignition. After receiving this value, the algorithm in the supplementary combustion intelligent control system issues an instruction to shut down the first supplementary combustion electric igniter (72-2-1-8) and / or the mth supplementary combustion electric igniter (72-2-m-8). At the same time, the algorithm in the supplementary combustion intelligent control system issues a command to increase the opening of the first supplementary combustion air electric valve (72-2-1-7) and the first supplementary combustion gas electric valve (72-2-1-10), and / or the mth supplementary combustion air electric valve (72-2-m-7) and the mth supplementary combustion gas electric valve (72-2-m-10), that is, to increase the flow rate; At this time, the flow rate of the mixed gas entering the first afterburning ignition chamber (72-2-1-4) and / or the m-th afterburning ignition chamber (72-2-m-4) gradually increases. The flow ratio of air to fuel gas in the mixed gas is controlled by an algorithm, so that the flame flows forward with the flow of the mixed gas. The flame enters through the first afterburning mixing pipe (72-2-1-3) and the first afterburning branch pipe circuit (72-2-1-2) in sequence and is ejected from all the first afterburning nozzles (72-2-1-1), and / or enters through the m-th afterburning mixing pipe (72-2-m-3) and the m-th afterburning branch pipe circuit (72-2-m-2) in sequence and is ejected from all the m-th afterburning nozzles (72-2-m-1). At this time, the combustion status of the gas mixture in all the combustion nozzles of the combustion device (72-2) can be observed in the combustion observation window (72-3). This combustion status video information is recorded by the combustion observation video monitor (72-6) and then transmitted to the combustion intelligent control system for storage. The result of the combustion status video information of all the gas mixture in the combustion device (72-2) after being analyzed and processed by AI technology is the value representing the ignition. After receiving this value, the algorithm in the combustion intelligent control system issues an instruction to maintain the current opening degree of the first combustion air electric valve (72-2-1-7) and the first combustion gas electric valve (72-2-1-10), and / or the mth combustion air electric valve (72-2-m-7) and the mth combustion gas electric valve (72-2-m-10); then the combustion system is in normal operation. The pre-combustion flue gas temperature and pressure values ​​and post-combustion flue gas temperature and pressure values, which are stored in the intelligent combustion control system, are analyzed and processed by AI technology as a reference for judging whether the combustion system is operating normally.

[0017] Furthermore, the working method and principle of an integrated molten salt heat exchanger for flue gas purification in a combustion-type process are characterized by: The working principle of the afterburning device (72-2) to achieve more uniform and efficient afterburning and heat transfer within the flue gas is as follows: Because, firstly, the flue gas pressure is the same on the same isobar; secondly, the axis of the first supplementary combustion branch circuit (72-2-1-2) coincides with the first isobaric line of the flue gas (72-1-1), and the first supplementary combustion branch circuit (72-2-1-2) is a continuous circuit; the axis of the first supplementary combustion nozzle (72-2-1-1) is along the flue gas flow direction and perpendicular to the axis of the first supplementary combustion branch circuit (72-2-1-2), and the first supplementary combustion nozzle (72-2-1-1) is connected to the first supplementary combustion branch circuit (72-2-1-2), and / or the m-th supplementary combustion branch circuit (72-2-1-2) is connected to the first supplementary combustion branch circuit (72-2-1-2). The axis of the m-2 isobaric line of the flue gas (72-1-m) coincides with the m-th isobaric line of the flue gas. The m-th supplementary combustion branch circuit (72-2-m-2) is a continuous circuit. The axis of the m-th supplementary combustion nozzle (72-2-m-1) is along the flue gas flow direction and perpendicular to the axis of the m-th supplementary combustion branch circuit (72-2-m-2). The m-th supplementary combustion nozzle (72-2-m-1) is connected to the m-th supplementary combustion branch circuit (72-2-m-2). Therefore, the above arrangement can ensure that the pressure at each supplementary combustion nozzle is the same, thereby ensuring that the supplementary combustion mixture can reach all supplementary combustion nozzles evenly for combustion. Firstly, the first isobaric line (72-1-1) and the m-th isobaric line (72-1-m) of the flue gas selected at the flue section are evenly distributed at that section; secondly, multiple first combustion nozzles (72-2-1-1) are evenly arranged along the axis of the first combustion branch circuit (72-2-1-2), and / or multiple m-th combustion nozzles (72-2-m-1) are evenly arranged along the axis of the m-th combustion branch circuit (72-2-m-2); therefore, the above arrangement can ensure that the heat distribution of combustion on the flue section is relatively uniform. In the aforementioned afterburning device (72-2), the internal cross-sectional profile of all afterburning nozzles is a hyperbola. This structure not only improves the combustion efficiency of the gas mixture but also enhances the heat transfer efficiency of the flue gas after combustion. The lower part decreases in size, which increases the kinetic energy of the flue gas and improves the exhaust velocity; the upper part increases in size, gradually diffusing into the original flue gas, which reduces the exhaust resistance of the flue gas generated by afterburning.

[0018] Compared with the prior art, the present invention has the following advantages and outstanding technical effects: 1) To achieve more uniform and efficient combustion and heat transfer within the flue gas; 2) It achieves a safer ignition method for supplementary combustion gas or atomized supplementary combustion liquid (or gas-powder) mixture outside the flue; and it also enables more convenient monitoring of the supplementary combustion situation; 3) To achieve the purification functions of denitrification and decarbonization of flue gas; 4) Achieve complete decoupling of thermoelectricity in the gas turbine power generation, heating and energy storage system, enabling the system to independently supply power, store heat or provide heat. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a gas and steam power generation and combustion supplementary combustion type thermal storage and heating decoupling system; Figure 2 This is a schematic diagram of a combustion-type molten salt thermal storage and heating system. Figure 3 This is a schematic diagram of a molten salt heat exchanger for flue gas purification in a combustion-type process. Figure 4 This is a schematic diagram of a flue gas internal combustion supplementation system with external ignition and combustion supplementation. Figure 5 This is a schematic diagram of a combustion chamber. Figure 6 This is a schematic diagram of a nozzle structure; In the diagram: 10. Gas turbine power generation system; 20. Exhaust flue gas; 30. Power transmission and distribution system; 40. External power grid; 50. Cable; 60. Flue gas pipeline; 70. Molten salt thermal storage system; 80. Steam power generation system; 90. Main steam pipeline; 100. Return water pipeline; 110. Waste heat exchanger; 120. Thermal pipeline; 130. External heating demand; 140. External industrial steam demand. 70-0 Molten salt pipeline; 70-1 High-temperature molten salt storage tank; 70-2 Low-temperature molten salt storage tank; 70-3 Molten salt heating device; 70-4 Molten salt industrial steam generator; 70-5 Molten salt high-temperature and high-pressure steam generator; 71 Supplementary combustion type flue gas molten salt heat exchange integrated device; 72 Supplementary combustion system; 73-1 Primary flue gas molten salt heat exchange component; 73-2 Secondary flue gas molten salt heat exchange component; 73-3 Tertiary flue gas molten salt heat exchange component; 74 SCR flue gas denitrification component; 75 Flue gas decarbonization component; 72-3. Combustion observation window of the afterburning nozzle; 72-4. Flue gas temperature and pressure measuring instrument before afterburning; 72-5. Flue gas temperature and pressure measuring instrument after afterburning; 72-6. Combustion observation video monitor of the afterburning nozzle; 72-7. Afterburning ignition video monitor; 72-2. Afterburning device; 72-1-0. Inner contour line of flue section; 72-1-1. First isobaric line of flue gas; 72-1-m. Mth isobaric line of flue gas; 72-2-1-1. First afterburning nozzle; 72-2-1-2. First afterburning branch circuit; 72-2-1-3. First afterburning mixing pipe; 72-2-1-4. First afterburning ignition chamber; 72-2-1-5. First afterburning ignition observation window; 72-2-1-6. First afterburning air pipe; 72-2-1 -7. First supplementary combustion air electric valve; 72-2-1-8. First supplementary combustion electric igniter; 72-2-1-9. First supplementary combustion gas pipe; 72-2-1-10. First supplementary combustion gas electric valve; 72-2-m-1. m-th supplementary combustion nozzle; 72-2-m-2. m-th supplementary combustion branch circuit; 72-2-m-3. m-th supplementary combustion mixing pipe; 72-2-m-4. m-th supplementary combustion ignition chamber; 72-2-m-5. m-th supplementary combustion ignition observation window; 72-2-m-6. m-th supplementary combustion air pipe; 72-2-m-7. m-th supplementary combustion air electric valve; 72-2-m-8. m-th supplementary combustion electric igniter; 72-2-m-9. m-th supplementary combustion gas pipe; 72-2-m-10. m-th supplementary combustion gas electric valve; where m is a natural number. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figure 1 A schematic diagram of a gas-fired and steam-powered supplementary combustion type thermal storage and heating decoupling system is shown. A gas and steam power generation supplementary combustion type thermal storage and heating decoupling system includes a gas turbine power generation system (10), a power transmission and transformation system (30), a molten salt thermal storage system (70), a steam power generation system (80), and a waste heat exchanger (110). The gas turbine power generation system (10) is connected to the molten salt thermal storage system (70) through the flue gas pipeline (60); the molten salt thermal storage system (70) is connected to the waste heat exchanger (110) through the flue gas pipeline (60); the gas turbine power generation system (10) is connected to the power transmission and transformation system (30) through the cable (50); the molten salt thermal storage system (70) is connected to the steam power generation system (80) through the main steam pipeline (90) and the return water pipeline (100); the steam power generation system (80) is connected to the power transmission and transformation system (30) through the cable (50).

[0021] The power transmission and transformation system (30) is connected to the external power grid (40) via a cable (50); The electricity generated by the gas turbine power generation system (10) is transmitted through the power transmission and transformation system (30) via the cable (50) to the external power grid (40). The flue gas discharged from the gas turbine power generation system (10) passes through the flue gas pipeline (60) and then passes through the combustion-type flue gas molten salt heat exchange integrated device (71) and the waste heat exchanger (110) in sequence, and then becomes exhaust flue gas (20) before being discharged into the air. The electricity generated by the steam power generation system (80) is transmitted through the power transmission and transformation system (30) via the cable (50) to the external power grid (40). The external heating demand (130) is connected to the molten salt heating device (70-3) through a heat pipe (120); The external industrial steam demand (140) is connected to the molten salt industrial steam generating unit (70-4) via a heat pipeline (120).

[0022] like Figure 2 A schematic diagram of a combustion-type molten salt thermal storage and heating system is shown. The molten salt thermal storage system (70) includes a combustion-type flue gas molten salt heat exchange integrated device (71), a high-temperature molten salt storage tank (70-1), a low-temperature molten salt storage tank (70-2), a molten salt heating device (70-3), a molten salt industrial steam generating device (70-4), and a molten salt high-temperature and high-pressure steam generating device (70-5). The molten salt outlet of the low-temperature molten salt storage tank (70-2) is connected to the molten salt inlet of the combustion-type flue gas molten salt heat exchanger (71) via a molten salt pipeline (70-0); The molten salt inlet of the low-temperature molten salt storage tank (70-2) is connected to the molten salt outlet of the molten salt high-temperature and high-pressure steam generator (70-5), the molten salt heating device (70-3), and the molten salt industrial steam generator (70-4) via the molten salt pipeline (70-0). The molten salt inlet of the high-temperature molten salt storage tank (70-1) is connected to the molten salt outlet of the combustion-type flue gas molten salt heat exchanger (71) via a molten salt pipeline (70-0); The molten salt outlet of the high-temperature molten salt storage tank (70-2) is connected to the molten salt inlet of the molten salt high-temperature and high-pressure steam generator (70-5), the molten salt heating device (70-3), and the molten salt industrial steam generator (70-4) via the molten salt pipeline (70-0).

[0023] The low-temperature molten salt is pumped from the low-temperature molten salt storage tank (70-2) through the molten salt pipeline (70-0) to the combustion-type flue gas molten salt heat exchanger (71) to exchange heat with the flue gas and become high-temperature molten salt. The high-temperature molten salt is pumped from the combustion-type flue gas molten salt heat exchanger (71) through the molten salt pipeline (70-0) to the high-temperature molten salt storage tank (70-1). Under the action of the molten salt pump, the high-temperature molten salt is transferred from the high-temperature molten salt storage tank (70-1) through the molten salt pipeline (70-0) to the molten salt high-temperature high-pressure steam generator (70-5), the molten salt heating device (70-2), and the molten salt industrial steam generator (70-4) for heat exchange, and then becomes low-temperature molten salt. The low-temperature molten salt is then transferred from the high-temperature molten salt storage tank (70-2) through the molten salt pipeline (70-0) under the action of the molten salt pump.

[0024] like Figure 3 A schematic diagram of a combustion-type flue gas purification molten salt heat exchange device is shown. The combustion-type flue gas molten salt heat exchange integrated device (71) includes a combustion system (72) or combustion device (72-2), a primary flue gas molten salt heat exchange component (73-1), a flue gas decarbonization component (75), a secondary flue gas molten salt heat exchange component (73-2), an SCR flue gas denitrification component (74), and a tertiary flue gas molten salt heat exchange component (73-3). The burner system (72) is connected to the primary flue gas molten salt heat exchange assembly (73-1) via flue gas pipeline (60); the primary flue gas molten salt heat exchange assembly (73-1) is connected to the flue gas decarbonization assembly (75) via flue gas pipeline (60); the flue gas decarbonization assembly (75) is connected to the secondary flue gas molten salt heat exchange assembly (73-2) via flue gas pipeline (60); the secondary flue gas molten salt heat exchange assembly (73-2) is connected to the SCR flue gas denitrification assembly (74) via flue gas pipeline (60); the SCR flue gas denitrification assembly (74) is connected to the tertiary flue gas molten salt heat exchange assembly (73-3) via flue gas pipeline (60); the positions of the SCR flue gas denitrification assembly (74) and the flue gas decarbonization assembly (75) can be interchanged, and the secondary flue gas molten salt heat exchange assembly (73-2) is no longer installed when interchanged.

[0025] Alternatively, the flue gas decarbonization component (75) can be removed from the aforementioned combustion-type flue gas molten salt heat exchange integrated device (71) to obtain the combustion-type flue gas molten salt heat exchange denitrification integrated device.

[0026] The afterburner system (72) is located near the flue gas inflow point of the afterburner type flue gas molten salt heat exchanger integrated device (71); along the direction of flue gas inflow: the afterburner system (72) is connected to the primary flue gas molten salt heat exchanger assembly (73-1) through the flue gas pipeline (60); the primary flue gas molten salt heat exchanger assembly (73-1) is connected to the flue gas decarbonization assembly (75) through the flue gas pipeline (60); the flue gas decarbonization assembly (75) is connected to the secondary flue gas molten salt heat exchanger assembly (73-2) through the flue gas pipeline (60); the secondary flue gas molten salt heat exchanger assembly (73-2) is connected to the SCR flue gas denitrification assembly (74) through the flue gas pipeline (60); the SCR flue gas denitrification assembly (74) is connected to the tertiary flue gas molten salt heat exchanger assembly (74) through the flue gas pipeline (60). The heat exchange assembly (73-3) is connected; the molten salt inlet of the tertiary flue gas molten salt heat exchange assembly (73-3) is connected to the molten salt outlet of the low-temperature molten salt storage tank (70-2) through the molten salt pipeline (70-0); the molten salt outlet of the tertiary flue gas molten salt heat exchange assembly (73-3) is connected to the molten salt inlet of the secondary flue gas molten salt heat exchange assembly (73-2) through the molten salt pipeline (70-0); the molten salt outlet of the secondary flue gas molten salt heat exchange assembly (73-2) is connected to the molten salt inlet of the primary flue gas molten salt heat exchange assembly (73-1) through the molten salt pipeline (70-0); the molten salt outlet of the primary flue gas molten salt heat exchange assembly (73-1) is connected to the molten salt inlet of the high-temperature molten salt storage tank (70-1) through the molten salt pipeline (70-0).

[0027] Waste heat storage process: After the gas turbine power generation system (10) generates electricity, the flue gas enters the combustion-type flue gas molten salt heat exchange integrated device (71), in which the flue gas exchanges heat with low temperature molten salt. The waste heat in the flue gas heats the low temperature molten salt into high temperature molten salt. Under the action of the molten salt pump, the high temperature molten salt enters the high temperature molten salt storage tank (70-1) through the molten salt pipeline (70-0). The flue gas that has exchanged heat with the molten salt and the waste heat exchanger (110) further exchange heat and become exhaust flue gas (20) and is discharged into the air. The process of generating electricity through heat release is as follows: under the action of the molten salt pump, the high-temperature molten salt enters the molten salt high-temperature and high-pressure steam generating device (70-5) through the molten salt pipeline (70-0). In the device, the high-temperature molten salt exchanges heat with water, turning the water into high-temperature and high-pressure steam. The high-temperature and high-pressure steam enters the steam power generation system (80) through the main steam pipeline (90) to generate electricity. The generated electricity is transmitted through the cable (50) and the power transmission and transformation system (30) to the external power grid (40). The high-temperature and high-pressure steam that has generated electricity becomes low-pressure steam and / or condensate and returns to the molten salt heat storage system (70) through the return water pipeline (100). After heat exchange, the high-temperature molten salt becomes low-temperature molten salt, which enters the low-temperature molten salt storage tank (70-2) through the molten salt pipeline (70-0) under the action of the molten salt pump. The heat release and heating process is achieved as follows: Under the action of the molten salt pump, the high-temperature molten salt enters the molten salt heating device (70-3) and the molten salt industrial steam generating device (70-4) through the molten salt pipeline (70-0). In the device, the high-temperature molten salt exchanges heat with water. The hot water or steam generated after the heat exchange is respectively delivered through the heat pipeline (120) to meet the external heating demand (130) and the external industrial steam demand (140). After the heat exchange, the high-temperature molten salt becomes low-temperature molten salt, which enters the low-temperature molten salt storage tank (70-2) through the molten salt pipeline (70-0) under the action of the molten salt pump. Achieving complete decoupling of thermoelectricity: Decoupling of heat storage and gas turbine power generation, because the heat energy of the molten salt thermal storage system (70) comes from the residual heat of the flue gas after the gas turbine generates electricity and the heat energy generated by the supplementary combustion of the supplementary combustion system (72), thus decoupling the coupling relationship between heat storage and gas turbine power generation; Decoupling of heat supply and gas turbine power generation, because the heat energy of the molten salt thermal storage system (70) comes from the residual heat of the flue gas after the gas turbine generates electricity and the heat energy generated by the supplementary combustion of the supplementary combustion system (72), heat release includes heat release power generation and heat release power supply, heat release power generation and heat release power supply operate independently, thus decoupling the coupling relationship between heat supply and gas turbine power generation.

[0028] like Figure 4 A schematic diagram of a flue gas internal combustion and external ignition combustion system is shown. The working process of the internal combustion and external ignition system (72) for flue gas is as follows: The flue gas first passes through the pre-combustion flue gas temperature and pressure measuring instrument (72-4) upstream of the combustion device (72-2) to measure the pre-combustion flue gas temperature and pressure values. The pre-combustion flue gas temperature and pressure values ​​are then transmitted to the combustion intelligent control system via a transmitter for backup. When the flue gas passes through the combustion device (72-2), it is heated by the combustion device (72-2) and continues to flow downstream; the combustion observation video monitor (72-6) of the combustion nozzle records the combustion status of all nozzles in the combustion device (72-2) through the combustion observation window (72-3), and the video signal is transmitted to the combustion intelligent control system through the video signal line. The result is analyzed and processed by AI technology and stored for later use. After the flue gas is re-burned by the re-burning device (72-2), the flue gas temperature and pressure are measured by the flue gas temperature and pressure measuring instrument (72-5). The flue gas temperature and pressure values ​​are then transmitted to the re-burning intelligent control system via a transmitter for backup. The following data are processed by AI technology: the pre-combustion flue gas temperature and pressure values ​​and the post-combustion flue gas temperature and pressure values ​​are stored in the intelligent combustion control system; the combustion status of all nozzles in the combustion device (72-2) recorded by the combustion observation video monitor (72-6) stored in the intelligent combustion control system is analyzed and processed by AI technology; the ignition status of all combustion chambers in the combustion device (72-2) recorded by the combustion ignition video monitor (72-7) stored in the intelligent combustion control system is analyzed and processed by AI technology; and the relationships between the first combustion air electric valve (72-2-1-7), the first combustion electric igniter (72-2-1-8), the first combustion gas electric valve (72-2-1-10), the m-th combustion air electric valve (72-2-m-7), the m-th combustion electric igniter (72-2-m-8), and the m-th combustion gas electric valve (72-2-m-10) are interlocked, and the control logic is executed by the algorithm in the intelligent combustion control system.

[0029] like Figure 5 A schematic diagram of the structure of a combustion chamber and Figure 6 The diagram shows the structure of a nozzle. When the flue gas requires re-combustion, the re-combustion device (72-2) proceeds from ignition to normal operation as follows: When the flue gas needs to be supplemented with combustion, the algorithm in the supplementation combustion intelligent control system issues a command to open the first supplementation air electric valve (72-2-1-7) and / or the mth supplementation air electric valve (72-2-m-7), and after 1~2 seconds; The algorithm in the supplementary combustion intelligent control system issues instructions to open the first supplementary combustion electric igniter (72-2-1-8) and the first supplementary combustion gas electric valve (72-2-1-10) simultaneously, and / or the mth supplementary combustion electric igniter (72-2-m-8) and the mth supplementary combustion gas electric valve (72-2-m-10) simultaneously; At this time, the mixture in the first supplementary combustion ignition observation window (72-2-1-5) and / or the mth supplementary combustion ignition observation window (72-2-m-5) can be observed to have been ignited. This ignition video information is recorded by the supplementary combustion ignition video monitor (72-7) and then transmitted to the supplementary combustion intelligent control system for storage. The video information of the ignition status of all supplementary combustion ignition chambers in the supplementary combustion device (72-2) is analyzed and processed by AI technology, and the result is the value representing the ignition. After receiving this value, the algorithm in the supplementary combustion intelligent control system issues an instruction to shut down the first supplementary combustion electric igniter (72-2-1-8) and / or the mth supplementary combustion electric igniter (72-2-m-8). At the same time, the algorithm in the supplementary combustion intelligent control system issues a command to increase the opening of the first supplementary combustion air electric valve (72-2-1-7) and the first supplementary combustion gas electric valve (72-2-1-10), and / or the mth supplementary combustion air electric valve (72-2-m-7) and the mth supplementary combustion gas electric valve (72-2-m-10), that is, to increase the flow rate; At this time, the flow rate of the mixed gas entering the first afterburning ignition chamber (72-2-1-4) and / or the m-th afterburning ignition chamber (72-2-m-4) gradually increases. The flow ratio of air to fuel gas in the mixed gas is controlled by an algorithm, so that the flame flows forward with the flow of the mixed gas. The flame enters through the first afterburning mixing pipe (72-2-1-3) and the first afterburning branch pipe circuit (72-2-1-2) in sequence and is ejected from all the first afterburning nozzles (72-2-1-1), and / or enters through the m-th afterburning mixing pipe (72-2-m-3) and the m-th afterburning branch pipe circuit (72-2-m-2) in sequence and is ejected from all the m-th afterburning nozzles (72-2-m-1). At this time, the combustion status of the gas mixture in all the combustion nozzles of the combustion device (72-2) can be observed in the combustion observation window (72-3). This combustion status video information is recorded by the combustion observation video monitor (72-6) and then transmitted to the combustion intelligent control system for storage. The result of the combustion status video information of all the gas mixture in the combustion device (72-2) after being analyzed and processed by AI technology is the value representing the ignition. After receiving this value, the algorithm in the combustion intelligent control system issues an instruction to maintain the current opening degree of the first combustion air electric valve (72-2-1-7) and the first combustion gas electric valve (72-2-1-10), and / or the mth combustion air electric valve (72-2-m-7) and the mth combustion gas electric valve (72-2-m-10); then the combustion system is in normal operation. The pre-combustion flue gas temperature and pressure values ​​and post-combustion flue gas temperature and pressure values, which are stored in the intelligent combustion control system, are analyzed and processed by AI technology as a reference for judging whether the combustion system is operating normally.

[0030] The working principle of the afterburning device (72-2) to achieve more uniform and efficient afterburning and heat transfer within the flue gas is as follows: Because, firstly, the flue gas pressure is the same on the same isobar; secondly, the axis of the first supplementary combustion branch circuit (72-2-1-2) coincides with the first isobaric line of the flue gas (72-1-1), and the first supplementary combustion branch circuit (72-2-1-2) is a continuous circuit; the axis of the first supplementary combustion nozzle (72-2-1-1) is along the flue gas flow direction and perpendicular to the axis of the first supplementary combustion branch circuit (72-2-1-2), and the first supplementary combustion nozzle (72-2-1-1) is connected to the first supplementary combustion branch circuit (72-2-1-2), and / or the m-th supplementary combustion branch circuit (72-2-1-2) is connected to the first supplementary combustion branch circuit (72-2-1-2). The axis of the m-2 isobaric line of the flue gas (72-1-m) coincides with the m-th isobaric line of the flue gas. The m-th supplementary combustion branch circuit (72-2-m-2) is a continuous circuit. The axis of the m-th supplementary combustion nozzle (72-2-m-1) is along the flue gas flow direction and perpendicular to the axis of the m-th supplementary combustion branch circuit (72-2-m-2). The m-th supplementary combustion nozzle (72-2-m-1) is connected to the m-th supplementary combustion branch circuit (72-2-m-2). Therefore, the above arrangement can ensure that the pressure at each supplementary combustion nozzle is the same, thereby ensuring that the supplementary combustion mixture can reach all supplementary combustion nozzles evenly for combustion. Firstly, the first isobaric line (72-1-1) and the m-th isobaric line (72-1-m) of the flue gas selected at the flue section are evenly distributed at that section; secondly, multiple first combustion nozzles (72-2-1-1) are evenly arranged along the axis of the first combustion branch circuit (72-2-1-2), and / or multiple m-th combustion nozzles (72-2-m-1) are evenly arranged along the axis of the m-th combustion branch circuit (72-2-m-2); therefore, the above arrangement can ensure that the heat distribution of combustion on the flue section is relatively uniform. In the aforementioned afterburning device (72-2), the internal cross-sectional profile of all afterburning nozzles is a hyperbola. This structure not only improves the combustion efficiency of the gas mixture but also enhances the heat transfer efficiency of the flue gas after combustion. The lower part decreases in size, which increases the kinetic energy of the flue gas and improves the exhaust velocity; the upper part increases in size, gradually diffusing into the original flue gas, which reduces the exhaust resistance of the flue gas generated by afterburning.

[0031] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. Any simple modifications, equivalent variations, and alterations made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A combustion-type flue gas purification molten salt heat exchange integrated device, characterized in that: It includes a burner system (72), a primary flue gas molten salt heat exchange assembly (73-1), a flue gas decarbonization assembly (75), a secondary flue gas molten salt heat exchange assembly (73-2), an SCR flue gas denitrification assembly (74), and a tertiary flue gas molten salt heat exchange assembly (73-3). The afterburner system (72) is arranged near the flue gas inflow position of the afterburner type flue gas molten salt heat exchange integrated device (71); along the direction of flue gas inflow: the afterburner system (72) is connected to the first-stage flue gas molten salt heat exchange component (73-1) through the flue gas pipeline (60); the first-stage flue gas molten salt heat exchange component (73-1) is connected to the flue gas decarbonization component (75) through the flue gas pipeline (60); the flue gas decarbonization component (75) is connected to the second-stage flue gas molten salt heat exchange component (73-2) through the flue gas pipeline (60); the second-stage flue gas molten salt heat exchange component (73-2) is connected to the SCR flue gas denitrification component (74) through the flue gas pipeline (60); the SCR flue gas denitrification component (74) is connected to the third-stage flue gas molten salt heat exchange component (73-3) through the flue gas pipeline (60); The positions of the SCR flue gas denitrification component (74) and the flue gas decarbonization component (75) can be interchanged. When interchanged, the secondary flue gas molten salt heat exchange component (73-2) is no longer installed. The molten salt inlet of the tertiary flue gas molten salt heat exchanger (73-3) is connected to the molten salt outlet of the low-temperature molten salt storage tank (70-2) via a molten salt pipeline (70-0); the molten salt outlet of the tertiary flue gas molten salt heat exchanger (73-3) is connected to the molten salt inlet of the secondary flue gas molten salt heat exchanger (73-2) via a molten salt pipeline (70-0); the molten salt outlet of the secondary flue gas molten salt heat exchanger (73-2) is connected to the molten salt inlet of the primary flue gas molten salt heat exchanger (73-1) via a molten salt pipeline (70-0); and the molten salt outlet of the primary flue gas molten salt heat exchanger (73-1) is connected to the molten salt inlet of the high-temperature molten salt storage tank (70-1) via a molten salt pipeline (70-0). The afterburner system (72) includes at least one afterburner device (72-2), which is used to afterburn the exhaust gas generated after the gas turbine generates electricity; The cross-section of the high-temperature exhaust gas duct of the gas turbine has the first isobaric line (72-1-1) to the m-th isobaric line (72-1-m); the pressure of the flue gas on the same isobaric line is the same; the position of the first isobaric line (72-1-1) to the m-th isobaric line (72-1-m) is obtained by numerical simulation calculation; The afterburning device (72-2) includes at least one first afterburning nozzle (72-2-1-1), a first afterburning branch circuit (72-2-1-2), a first afterburning mixing pipe (72-2-1-3), a first afterburning ignition chamber (72-2-1-4), a first afterburning ignition observation window (72-2-1-5), a first afterburning air pipe (72-2-1-6), a first afterburning air electric valve (72-2-1-7), a first afterburning electric igniter (72-2-1-8), a first afterburning gas pipe (72-2-1-9), a first afterburning gas electric valve (72-2-1-10), at least one m-th afterburning nozzle (72-2-m-1), and the m-th afterburning branch circuit (72-2-1-2). The combustion device (72-2) comprises m combustion branch circuits, combustion mixing pipes (72-2-m-3), combustion ignition chambers (72-2-m-4), combustion ignition observation windows (72-2-m-5), combustion air pipes (72-2-m-6), combustion air electric valves (72-2-m-7), combustion electric igniters (72-2-m-8), combustion gas pipes (72-2-m-9), and combustion gas electric valves (72-2-m-10); the combustion device (72-2) consists of m combustion branch circuits, combustion mixing pipes, combustion ignition chambers, combustion air pipes, combustion air electric valves, combustion electric igniters, combustion gas pipes, and combustion gas electric valves; where m is a natural number. The axis of the first supplementary combustion branch circuit (72-2-1-2) coincides with the first equal pressure line of flue gas (72-1-1), and the first supplementary combustion branch circuit (72-2-1-2) is a connected circuit; The axis of the first afterburning nozzle (72-2-1-1) is along the flue gas flow direction and perpendicular to the axis of the first afterburning branch circuit (72-2-1-2). The first afterburning nozzle (72-2-1-1) is connected to the first afterburning branch circuit (72-2-1-2). Multiple first afterburning nozzles (72-2-1-1) are evenly arranged along the axis of the first afterburning branch circuit (72-2-1-2). The axis of the first afterburning mixing pipe (72-2-1-3) is connected to the axis of the first afterburning branch pipe circuit (72-2-1-2), and the first afterburning mixing pipe (72-2-1-3) and the first afterburning branch pipe circuit (72-2-1-2) are connected in a continuous manner; The symmetry line of the first afterburning ignition chamber (72-2-1-4) is connected in the same direction as the axis of the first afterburning mixing pipe (72-2-1-3), and the first afterburning ignition chamber (72-2-1-4) and the first afterburning mixing pipe (72-2-1-3) are connected in a through manner; The first afterburning observation window (72-2-1-5) is set on the first afterburning chamber (72-2-1-4), and its setting method and number are to facilitate the observation and determination of the ignition situation in the first afterburning chamber (72-2-1-4); The axis of the first afterburning air pipe (72-2-1-6) is obliquely connected to the symmetrical line of the first afterburning ignition chamber (72-2-1-4), and the first afterburning air pipe (72-2-1-6) and the first afterburning ignition chamber (72-2-1-4) are obliquely connected; a first afterburning air electric valve (72-2-1-7) is provided on the first afterburning air pipe (72-2-1-6) to control the air flow. The axis of the first supplementary combustion gas pipe (72-2-1-9) is connected in the same direction as the symmetrical line of the first supplementary combustion ignition chamber (72-2-1-4). The first supplementary combustion gas pipe (72-2-1-9) is inserted into the first supplementary combustion ignition chamber (72-2-1-4) for a certain length and then connected to it. The first supplementary combustion gas pipe (72-2-1-9) is equipped with a first supplementary combustion gas electric valve (72-2-1-10) to control the gas flow rate. The first supplementary combustion electric igniter (72-2-1-8) is connected at one end to the wall of the first supplementary combustion gas pipe (72-2-1-9) via a wire, and at the other end is equipped with at least one ignition probe. One end of the ignition probe is connected to the first supplementary combustion electric igniter (72-2-1-8) via a wire, and the other end is not in contact with the opening of the first supplementary combustion gas pipe (72-2-1-9) after it has been inserted into the first supplementary combustion ignition chamber (72-2-1-4) for a certain length. The distance is suitable for generating an electric spark after being energized. The first supplementary combustion electric igniter (72-2-1-8) is equipped with a low-voltage power supply. The axis of the m-th supplementary combustion branch circuit (72-2-m-2) coincides with the m-th isobaric line of the flue gas (72-1-m), and the m-th supplementary combustion branch circuit (72-2-m-2) is a connected circuit; The axis of the m-th afterburning nozzle (72-2-m-1) is along the flue gas flow direction and perpendicular to the axis of the m-th afterburning branch circuit (72-2-m-2). The m-th afterburning nozzle (72-2-m-1) is connected to the m-th afterburning branch circuit (72-2-m-2). Multiple m-th afterburning nozzles (72-2-m-1) are evenly arranged along the axis of the m-th afterburning branch circuit (72-2-m-2). The axis of the m-th supplementary combustion mixing pipe (72-2-m-3) is connected to the axis of the m-th supplementary combustion branch pipe circuit (72-2-m-2), and the m-th supplementary combustion mixing pipe (72-2-m-3) and the m-th supplementary combustion branch pipe circuit (72-2-m-2) are connected in a continuous manner; The symmetry line of the m-th afterburning ignition chamber (72-2-m-4) is connected in the same direction as the axis of the m-th afterburning mixing pipe (72-2-m-3), and the m-th afterburning ignition chamber (72-2-m-4) and the m-th afterburning mixing pipe (72-2-m-3) are connected in a through manner; The m-th supplementary combustion ignition observation window (72-2-m-5) is set on the m-th supplementary combustion ignition chamber (72-2-m-4), and the way and number of its setting are to facilitate the observation and determination of the ignition situation in the m-th supplementary combustion ignition chamber (72-2-m-4); The axis of the m-th supplementary combustion air pipe (72-2-m-6) intersects the symmetry line of the m-th supplementary combustion ignition chamber (72-2-m-4) and is obliquely connected; the m-th supplementary combustion air pipe (72-2-m-6) and the m-th supplementary combustion ignition chamber (72-2-m-4) are obliquely connected; the m-th supplementary combustion air pipe (72-2-m-6) is equipped with an m-th supplementary combustion air electric valve (72-2-m-7) to control the air flow. The axis of the m-th supplementary combustion gas pipe (72-2-m-9) is connected in the same direction as the symmetry line of the m-th supplementary combustion ignition chamber (72-2-m-4). The m-th supplementary combustion gas pipe (72-2-m-9) is inserted into the m-th supplementary combustion ignition chamber (72-2-m-4) for a certain length and then connected to it. The m-th supplementary combustion gas pipe (72-2-m-9) is equipped with an m-th supplementary combustion gas electric valve (72-2-m-10) to control the gas flow rate. The m-th supplementary combustion electric igniter (72-2-m-8) is connected at one end to the wall of the m-th supplementary combustion gas pipe (72-2-m-9) via a wire, and at the other end is equipped with at least one ignition probe. One end of the ignition probe is connected to the m-th supplementary combustion electric igniter (72-2-m-8) via a wire, and the other end is not in contact with the opening of the m-th supplementary combustion gas pipe (72-2-m-9) after it has been inserted into the m-th supplementary combustion ignition chamber (72-2-m-4) for a certain length. The distance is suitable for generating an electric spark after being energized. The m-th supplementary combustion electric igniter (72-2-m-8) is equipped with a low-voltage power supply.

2. The integrated molten salt heat exchanger for flue gas purification according to claim 1, characterized in that: Includes a burner system (72). The afterburner system (72) includes at least one afterburner device (72-2), at least one afterburner ignition video monitor (72-7), at least one afterburner nozzle combustion observation window (72-3), at least one afterburner nozzle combustion observation video monitor (72-6), a flue gas temperature and pressure measuring instrument before afterburner (72-4), and a flue gas temperature and pressure measuring instrument after afterburner (72-5). Along the direction of the flue gas, at least one hole is opened on the flue wall downstream of the combustion device (72-2), and a combustion observation window (72-3) for the combustion of the combustion nozzle is embedded in each hole; the combustion observation video monitor (72-6) for the combustion of the combustion nozzle is arranged at a certain position outside the flue, and its position and number are determined so as to be able to observe the combustion of all combustion nozzles. An instrument for measuring the temperature and pressure of flue gas before combustion (72-4) is arranged upstream of the combustion device (72-2), with its probe inserted into the flue through the flue wall in the radial direction of the flue. A flue gas temperature and pressure measuring instrument (72-5) is arranged downstream of the afterburning device (72-2), with its probe inserted into the flue through the flue wall in the radial direction of the flue; when the flue gas temperature and pressure measuring instrument (72-5) is arranged upstream of the combustion observation window (72-3) of the afterburning nozzle, it is determined so as not to affect the observation of the combustion of the afterburning nozzle. The aforementioned afterburning ignition video monitor (72-7) is arranged at a certain position outside the flue. The position and number of the monitor are determined so that the ignition situation inside the afterburning ignition chamber of all afterburning devices can be observed. The combustion nozzles, combustion branch circuits, and part of the combustion mixing pipes in the combustion device (72-2) are arranged inside the flue. The combustion nozzles are distributed on the combustion branch circuits. The combustion branch circuits are connected to the part of the combustion mixing pipes and are connected to the inner wall of the flue through a support structure. The combustion mixing pipes in the combustion device pass through the flue wall in the radial direction of the flue.

3. The integrated molten salt heat exchanger for flue gas purification according to claim 1, characterized in that: The inner contour line (72-1-0) of the flue section of the flue gas pipeline (60) is circular, square or multi-segment closed broken line.

4. The integrated molten salt heat exchanger for flue gas purification according to claim 1, characterized in that: The gas inside the m-th supplementary combustion gas pipe (72-2-m-9) is a combustible gas, an atomized combustible gas-liquid mixture, an atomized combustible gas-powder mixture, or an atomized combustible gas-liquid-powder mixture.

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