Liquid slagging boiler with modular combustion chamber and peak regulation method

Abstract

The invention discloses a liquid slagging boiler with a modular combustion chamber and a peak regulation method, and belongs to the technical field of fire coal consumption reduction of thermal power generating units. According to the method, on the basis of a combustion chamber of an existing liquid slagging boiler, the combustion chamber is divided into four modular combustion chambers with the same size, an independent fuel nozzle and an independent draught fan are installed on the outer side of each modular combustion chamber, so that each modular combustion chamber can be independently used, and in the peak regulation process, according to the peak regulation requirement, the modular combustion chambers can be used independently; and determining the use number of independent combustion chambers. The partition screens and the modular combustion chambers in the boiler are of detachable and splicable structures, so that each modular combustion chamber can be detached from the liquid slagging boiler to be replaced and spliced. According to the boiler, operation of the combustion chamber module can be accurately controlled according to actual load requirements, energy consumption is effectively reduced under the low-load condition, and the combustion efficiency is improved; and when the load is increased, sufficient steam supply is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of boilers, and in particular relates to a liquid slag discharge boiler with a modular combustion chamber and a peak regulation method. Background Art

[0002] With the rapid development of new energy, the power system has an increasing demand for flexible power sources. Hydropower is mainly based on run-of-river power stations, which are constrained by the lagging construction of leading power stations and have limited regulation capabilities; pumped storage power stations are limited by site resources, and gas power is limited by gas sources and gas prices, and neither has the conditions for large-scale construction; nuclear power is constrained by safety and economy and is not suitable for frequent regulation; energy storage technology is not yet mature and economical, and has not yet gained a competitive advantage. Coal-fired power units operate stably and reliably, and after transformation, they can change loads over a larger range. They are the most economical and reliable large-scale flexible regulating power source under existing technical conditions and energy resource endowments. Coal-fired power flexibility transformation is a realistic choice to improve the system's regulation capabilities.

[0003] Liquid slag boiler is a special type of boiler, which is characterized by the fact that the slag generated after the fuel is burned is melted into liquid at the high temperature of the slag chamber and discharged from the furnace. Liquid slag boilers are widely used due to their high combustion temperature level and large heat capacity, sensitive load regulation, and fast load increase speed. However, due to the strict requirements on the air-coal ratio during operation, when the boiler load changes frequently and drastically, the air-coal ratio of the liquid slag boiler will be unbalanced, affecting the combustion quality and destroying the normal combustion conditions. Therefore, its peak-shaving technology is difficult and it is difficult to meet the current power system's needs for flexible peak-shaving and deep peak-shaving. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a liquid slag discharge boiler and a peak regulation method with a modular combustion chamber to solve the problem in the prior art that liquid slag discharge boilers are difficult to meet the deep peak regulation requirements.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A liquid slag discharge boiler with a modular combustion chamber, comprising a combustion chamber, wherein the combustion chamber is divided into four modular combustion chambers of equal volume by a partition screen, and the upper ends of all modular combustion chambers are connected to a flue; a pulverized coal burner is arranged in each modular combustion chamber, and all pulverized coal burners are connected to a pulverized coal equalizing distributor, and each modular combustion chamber is connected to a fan; The cross section of each modular combustion chamber is triangular, and the upper end surface area of ​​the modular combustion chamber is larger than the lower end surface area; The partition screen is a detachable structure, and a water cooling system is arranged in the partition screen; the modular combustion chamber can be removed from the liquid slag discharge boiler through the partition screen.

[0006] A further improvement of the present invention is: Preferably, the input end of the pulverized coal balanced distributor is connected to an air conveyor and a pulverized coal conveyor, and the output end of the pulverized coal balanced distributor is divided into four output pipelines, each of which is connected to a pulverized coal burner in a modular combustion chamber.

[0007] Preferably, the air conveyor and the coal powder conveyor are both provided with flow control devices.

[0008] Preferably, the water cooling system is shared by two adjacent modular combustion chambers, or each modular combustion chamber is provided with an independent water cooling system.

[0009] Preferably, a superheater is provided in the flue, and the superheater and the water cooling system are connected to a steam-water circulation system.

[0010] Preferably, a flue gas circulation device is provided in the flue.

[0011] Preferably, each modular combustion chamber is provided with its own modular combustion chamber control system.

[0012] Preferably, the flue is a straight smoke pipe type flue.

[0013] Preferably, the bottom of each modular combustion chamber is connected to its own ash hopper.

[0014] A peak load regulation method for the liquid slag discharge boiler with a modular combustion chamber includes the following two cases: When the boiler of a thermal power plant is generating electricity normally, the four modular combustion chambers are operating normally. After the pulverized coal and air are mixed in the pulverized coal balance distributor, they are burned in their respective modular combustion chambers under the action of the fan. When the thermal power plant is peaking, any one, two or three of the four modular combustion chambers operate normally. After the pulverized coal and air are mixed in the pulverized coal balance distributor, they are burned in their respective modular combustion chambers under the action of the fan.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a liquid slag boiler with a modular combustion chamber. The method is based on the combustion chamber of the existing liquid slag boiler, and the combustion chamber is divided into four modular combustion chambers of the same volume. Each modular combustion chamber is equipped with an independent fuel nozzle and a fan on the outside, so that each modular combustion chamber can be used separately, and all the combustion chambers are connected to the flue above, so that the liquid slag boiler can use the existing boiler device to reduce the modification cost. The partition screen and the independent combustion chamber in the boiler are set as multiple independent combustion chambers. The method sets the combustion chamber as a plurality of independent combustion chambers, so that in the peak-shaving process, the number of independent combustion chambers to be used can be determined according to the peak-shaving demand. The partition screen and the modular combustion chamber in the boiler are detachable and assembleable structures, so that each modular combustion chamber can be removed from the liquid slag boiler for replacement and assembly. The operation of the combustion chamber module is accurately controlled according to the actual load demand, and the energy consumption is effectively reduced and the combustion efficiency is improved under low load conditions; when the load increases, the steam supply is ensured to be sufficient. The invention improves the combustion stability and efficiency through the design of the modular combustion chamber device, adapts to the fluctuation of power demand, reduces pollutant emissions, and prolongs the service life of the equipment, and has significant technical progress and practical value. The liquid slag boiler also has the following advantages: (1) Improving combustion stability: The main combustion chamber of the boiler is designed as multiple modular, split independent combustion chambers, each of which is separated by a water-cooled wall to form an independent combustion chamber. This design ensures a more stable combustion process and reduces instability during low-load operation, thus avoiding sudden flameout in the furnace due to unstable combustion.

[0016] (2) Adapting to load changes: The modular design enables the combustion chamber to flexibly adapt to load requirements. Each module can operate independently and be dynamically adjusted as needed. This design enables coal-fired power units to quickly respond to insufficient power supply from renewable energy sources, quickly adjust loads, and ensure stable power supply.

[0017] (3) Improve combustion efficiency: Each independent combustion chamber is equipped with an independent fuel nozzle and fan, and is equipped with a flow control system to adjust the air-coal ratio to ensure the combustion efficiency of each module, reduce the generation of nitrogen oxides, and not cause additional load on the tail SCR denitrification system. Improving combustion efficiency not only reduces fuel consumption, but also reduces ash accumulation and slagging in the furnace, thereby reducing maintenance costs.

[0018] (4) Reduce pollutant emissions: Multiple modular independent combustion chambers share the original flue gas pipeline, and introduce a flue gas recirculation system at the top of the split combustion chamber to maintain the flue gas temperature. The variable frequency controlled exhaust fan is adjusted according to the actual flue gas flow rate to ensure effective exhaust at low and high loads, thereby ensuring the normal operation of the exhaust system. This design effectively reduces pollutant emissions and ensures compliance with environmental regulations.

[0019] (5) Intelligent control: Upgrade the existing combustion control system to enable it to independently control the operating status of each combustion chamber module. Use advanced automated operation technology and intelligent operation algorithms to ensure that the combustion status of each combustion chamber module can be monitored and adjusted in real time. The operating system has flexible adjustment capabilities to adapt to different load requirements and achieve optimal combustion efficiency and lowest emissions.

[0020] (7) Enhanced system reliability: The modular design makes the maintenance and overhaul of the combustion chamber more convenient. If a module fails, it can be shut down and repaired independently without affecting the normal operation of other modules, which significantly improves the overall reliability and maintainability of the system.

[0021] (6) The present invention is provided with a straight smoke pipe type flue, the main structure of the flue is a vertical structure, the radiation heating surface and the convection heating surface are heated evenly during the smoke exhaust process, and when multiple furnaces stop operating, the impact on the boiler unit is relatively small. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the overall structure of the modular combustion chamber device of the present invention; Figure 2 It is a top view of the overall structure of the modular combustion chamber device of the present invention.

[0023] Among them: 1. Modular combustion chamber one; 2. Modular combustion chamber two; 3. Modular combustion chamber three; 4. Modular combustion chamber four; 5. Fan; 6. Pulverized coal burner; 7. Pulverized coal balance distributor; 8. Superheater; 9. Reheater; 10. Economizer; 11. Flue gas circulation device; 12. Steam-water circulation system; 13. Ash hopper; 14. Partition screen; 15. Flue; 16. Inside the combustion chamber. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings: Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] The first aspect of the present invention discloses a liquid slag discharge boiler with modular combustion chambers, which are divided into four modular combustion chambers of equal volume by a partition screen 14, namely modular combustion chamber 1, modular combustion chamber 2, modular combustion chamber 3, and modular combustion chamber 4; a pulverized coal burner 6 is arranged outside each modular combustion chamber, and the upper ends of all modular combustion chambers are connected to a flue 15, each modular combustion chamber is connected to a fan 5, and each modular combustion chamber is passed through a pulverized coal equalizing distributor 7. A water cooling system is arranged in the partition screen 14, so that the partition screen 14 is a water-cooled wall.

[0026] The cross-section of each modular combustion chamber is triangular, and the cross-sectional area of ​​the lower part is smaller than the cross-sectional area of ​​the upper end, so that the lower end of each modular combustion chamber is closed; further, the lower end of each modular combustion chamber is connected to an ash hopper 13, and the arrangement of this structure facilitates the slag discharge of each modular combustion chamber.

[0027] In some embodiments of the present invention, the partition screens 14 are detachable modules arranged in a cross, and are composed of mutually perpendicular plate structures, which enable the four modular combustion chambers to be separated by the four partition screens 14. When the four partition screens 14 are disassembled at the same time, the four modular combustion chambers can be separated, and the pulverized coal burners 6 connected to the modular combustion chambers are further detached accordingly, and the pipelines for the pulverized coal equalizing distributor 3 to transport the pulverized coal and air mixture into the combustion chambers are detached from the respective modular combustion chambers.

[0028] The partition screen 14 can be two fixed water-cooled walls fixed perpendicularly to each other, or can be a detachable water-cooled wall. The modular combustion chamber can be removed from the liquid slagging boiler through the partition screen 14.

[0029] As a preferred solution, when the partition 14 is a vertically fixed water-cooled wall, each water-cooled wall is shared by two modular combustion chambers as the inner wall of each modular combustion chamber, that is, the two mutually perpendicular inner walls of each modular combustion chamber belong to two modular combustion chambers respectively. When installing the modular combustion chamber, the two outer walls of the modular combustion chamber are directly connected to the corresponding water-cooled wall to form a modular combustion chamber. The setting of this structure makes disassembly and assembly more convenient and can simplify the water cooling system.

[0030] As a preferred solution, when the partition screen 14 is a detachable water-cooled wall, each modular combustion chamber has an independent water-cooled wall as an inner wall, and each outer wall is fixedly connected to the inner wall. At the same time, the water-cooled walls as inner walls of the four modular combustion chambers are connected to each other to stabilize the structure. This connection method is convenient for disassembly and assembly, and makes each water cooling system more independent, so that the corresponding modular combustion chambers can be better cooled.

[0031] As a preference, the partition screen 14 is made of a water-cooled wall material. During installation, the water-cooled pipe in the water-cooled wall is connected to the corresponding water-cooled system, so that the cooling medium can flow into the water-cooled pipe.

[0032] The present invention divides the existing main combustion chamber design into multiple independently operated modules, which can be dynamically adjusted according to load requirements through an intelligent operating system. Each module contains complete combustion facilities, such as fuel supply, air supply, ignition system, etc.

[0033] In some embodiments of the present invention, all modular combustion chambers are connected to the pulverized coal balanced distributor 7 through pipelines; the input end of the balanced distributor 7 is connected to the air conveyor and the pulverized coal conveyor through pipelines, and the air conveyor is connected to the blower passing through the air preheater through pipelines. The output end of the pulverized coal balanced distributor 7 is provided with four output pipelines, which are inserted into each modular combustion chamber from the upper end of each modular combustion chamber through the four output pipelines, so that pulverized coal can be transported into the combustion chamber 16 of the modular combustion chamber.

[0034] Furthermore, the pipeline connected to the air conveyor, or the pipeline connected to the coal powder conveyor, or the output end of the air conveyor and the coal powder conveyor are provided with a flow control device to adjust the imported air-coal ratio according to the load requirements to ensure the combustion efficiency of each module and the stability of coal combustion during low-load operation.

[0035] In some embodiments of the present invention, an independent pulverized coal burner is provided on the outer wall of each modular combustion chamber, and the pulverized coal burner 6 can ignite into the modular combustion chamber. Each modular combustion chamber is provided with its own fan 5, and a flow control system is provided on the fan 5.

[0036] In some embodiments of the present invention, the existing combustion operating system is upgraded so that it can independently manage the operating status of each combustion chamber module, and advanced automation technology is used to ensure that the combustion status of each module can be monitored and adjusted in real time. The operating system of each modular combustion chamber is connected to the fan 5, pulverized coal burner 6, pulverized coal equalizer 7, flue gas circulation device 1, steam-water circulation system 12, ash hopper 13 and water cooling system in the partition screen 14 of each modular combustion chamber, so that the start and stop or flow of each device in the modular combustion chamber can be controlled separately. The operating system should have flexible adjustment capabilities to adapt to various load requirements; introduce intelligent algorithms to automatically adjust the operating status of each combustion chamber module. The intelligent operating system needs to dynamically adjust the combustion chamber and the transmission pipeline according to real-time data such as load demand, flue gas composition, temperature, etc. to ensure the best air-coal ratio, the best combustion efficiency and the lowest emissions.

[0037] In some embodiments of the present invention, in the flue 15, a superheater 8, a reheater 9 and an economizer 10 are sequentially disposed in the flue 15 along a direction from bottom to top.

[0038] In some embodiments of the present invention, the modular split independent combustion chamber utilizes the existing flue gas pipeline and introduces a flue gas recirculation device 11 at the upper part of the split combustion chamber to maintain the flue gas temperature. A variable frequency controlled exhaust fan is installed and adjusted according to the actual flue gas flow rate to ensure effective exhaust of smoke during low load and high load operation. The variable frequency fan maintains the appropriate flue gas flow rate and pressure by adjusting the speed, thereby ensuring the normal operation of the exhaust system.

[0039] In some embodiments of the present invention, a steam-water circulation system 12 is provided inside the combustion chamber and the flue 15. The steam-water circulation system 12 is connected to the water cooling system in the partition screen 14 and the superheater 8. The water-cooled wall evaporator tube absorbs the high-temperature heat in the furnace and converts water into steam to ensure the stable operation of the boiler under high load conditions. This allows water to be converted from liquid to superheated steam to drive the steam turbine to do work. When used in conjunction with the upgraded modular combustion chamber equipment, the working environment of key components during low-load operation is improved, reducing metal fatigue caused by uneven heating of pipes and reducing the risk of safety accidents such as pipe bursts, thereby extending the service life of the boiler.

[0040] The system flexibly deploys and activates a corresponding number of modular independent combustion units based on the actual demand of power load; divides the main combustion chamber into different combustion areas, improves the combustion efficiency of the boiler, reduces the emission of NOx under low load conditions, and realizes flexible load adjustment to adapt to power fluctuations. The advanced combustion management system is used to accurately control the operating parameters of each activated combustion module; implements continuous status monitoring, and dynamically optimizes the working mode of each module based on real-time collected data, aiming to achieve the highest combustion efficiency and maintain the lowest pollutant emission level.

[0041] The second aspect of the present invention discloses a peak load regulation method for a liquid slag discharge boiler having a modular combustion chamber. like Figure 1As shown in the figure, when the boiler of the thermal power plant is generating electricity normally and no peak load regulation is required, the four modular combustion chambers operate normally. After the coal is processed by the pulverized coal machine, the pulverized coal is ignited by the burner 6 in the combustion chamber through the pulverized coal equalizer 7 and the fan 5. The high-temperature flue gas generated by the combustion passes through the superheater 8, the reheater 9, the economizer 10, and the air preheater in turn. Each device uses the waste heat of the flue gas to heat the steam and air respectively to improve the overall thermal efficiency. After passing through these heat exchange devices, the flue gas is discharged after being treated to meet the standards to ensure environmental protection standards. In this process, the adopted direct circulation boiler design enables the water-cooled wall evaporator tubes in the high-temperature furnace to be reliably cooled. The water-cooled wall evaporator tubes convert water into steam by absorbing the high-temperature heat in the furnace, ensuring the stable operation of the boiler under high load conditions. Through precise control and monitoring, the entire system achieves efficient and stable power generation in different operating modes to meet the rated load and power generation requirements. This design not only improves the flexibility of boiler operation, but also significantly improves its overall efficiency and reliability, providing a solid guarantee for the efficient operation of thermal power plants.

[0042] When peak load regulation is required, that is, when renewable energy power is sufficient and thermal power demand is low, the entire system ensures that the combustion state of each combustion chamber module can be monitored and adjusted in real time through precise control and monitoring. The operating system adopts intelligent operation algorithms and makes dynamic adjustments based on real-time data (such as load demand, flue gas composition, temperature, etc.) to achieve optimal combustion efficiency and lowest emissions. For example, if two, three and four of the four combustion chambers of the main combustion chamber of the boiler are deactivated, and only the modular combustion chamber 1 is retained, the fuel supply and air supply in the deactivated combustion chamber will be cut off to reduce the overall fuel consumption of the boiler. After the coal is processed by the pulverized coal machine, the pulverized coal is mixed with air through the pulverized coal equalizer 7. The intelligent operating system adjusts the pulverized coal delivery amount and regulates the air-coal ratio according to the number of combustion chambers that need to be operated to adapt to the reduced load demand. The fan 5 delivers air to the operating combustion chamber, and the pulverized coal is ignited by the burner 6 for combustion. Since some combustion chambers are deactivated, the operating combustion chamber needs to maintain a stable combustion state to ensure combustion efficiency. The high-temperature flue gas generated by combustion passes through the superheater 8, reheater 9, economizer 10 and air preheater in sequence. As the load decreases, the flow of flue gas decreases, so the opening of the flue gas recirculation system is regulated by the intelligent control system according to the actual flue gas temperature to ensure that each device can fully utilize the flue gas waste heat, heat the steam and air, and improve the thermal efficiency. At the same time, the optimized water vapor system can ensure the steam temperature and ensure the stable workmanship of the steam turbine.

[0043] When the renewable energy power is insufficient and the thermal power demand is high, the operating system makes dynamic adjustments based on real-time data, opens modular combustion chamber 2 2, modular combustion chamber 3 3, modular combustion chamber 4 4, and reopens the fuel supply and air supply in the combustion chamber. After the coal is processed by the pulverized coal machine, the pulverized coal is mixed with air through the pulverized coal equalizer 7. The intelligent operating system adjusts the pulverized coal delivery rate and the air-coal ratio according to the number of combustion chambers in operation to adapt to the increased load demand. The high-temperature flue gas generated by combustion passes through the superheater 8, reheater 9, economizer 10 and air preheater in turn. As the load increases, the flue gas flow increases, so the intelligent control system is used to control the closure of the flue gas recirculation system to ensure that each device can make full use of the flue gas waste heat to heat the steam and air and improve thermal efficiency.

[0044] The present invention improves combustion stability and efficiency, adapts to fluctuations in electricity demand, reduces pollutant emissions, and extends the service life of equipment through the design of a modular combustion chamber. Each independent combustion chamber is separated by a water-cooled wall to form an independent combustion chamber, which ensures that the combustion process is stable during low-load operation, flexibly adjusts the load, quickly responds to insufficient power supply from new energy sources, and reduces fuel consumption and maintenance costs. The flue gas recirculation system effectively reduces pollutant emissions, and the optimized steam-water circulation system improves the working environment of key components and reduces the risk of safety accidents. The upgraded intelligent control system can monitor and adjust the combustion state in real time to achieve optimal combustion efficiency and minimum emissions. There are no major changes to other equipment, and it is suitable for the transformation and upgrading of existing boilers, thereby significantly improving the operating stability and efficiency of the boiler, meeting environmental protection requirements, and having significant technical progress and practical value.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0046] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0049] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid slag boiler with a modular combustion chamber, characterized in that: The combustion chamber comprises a combustion chamber, which is divided into four modular combustion chambers of equal volume by a partition screen (14), and the upper ends of all the modular combustion chambers are connected to a flue (15); each modular combustion chamber is provided with a pulverized coal burner (6), and all the pulverized coal burners (6) are connected to a pulverized coal equalizing distributor (7), and each modular combustion chamber is connected to a fan (5); The cross section of each modular combustion chamber is triangular, and the upper end surface area of ​​the modular combustion chamber is larger than the lower end surface area; The partition screen (14) is a detachable structure, and a water cooling system is arranged in the partition screen (14); the modular combustion chamber can be removed from the liquid slag discharge boiler through the partition screen (14).

2. A liquid slag discharge boiler with a modular combustion chamber according to claim 1, characterized in that: The input end of the pulverized coal balanced distributor (7) is connected to an air conveyor and a pulverized coal conveyor, and the output end of the pulverized coal balanced distributor (7) is divided into four output pipelines, each of which is connected to a pulverized coal burner (6) in a modular combustion chamber.

3. A liquid slag discharge boiler with a modular combustion chamber according to claim 2, characterized in that: The air conveyor and the coal powder conveyor are both provided with flow control devices.

4. The liquid slag discharge boiler with a modular combustion chamber according to claim 1, characterized in that: The water cooling system is shared by two adjacent modular combustion chambers, or each modular combustion chamber is provided with an independent water cooling system.

5. The liquid slag discharge boiler with a modular combustion chamber according to claim 4, characterized in that: A superheater (8) is provided in the flue (15), and the superheater (8) and the water cooling system are connected to a steam-water circulation system (12).

6. The liquid slag discharge boiler with a modular combustion chamber according to claim 1, characterized in that: A flue gas circulation device (11) is provided in the flue (15).

7. The liquid slag discharge boiler with a modular combustion chamber according to claim 1, characterized in that: Each modular combustion chamber is provided with its own modular combustion chamber control system.

8. The liquid slag discharge boiler with a modular combustion chamber according to claim 1, characterized in that: The flue (15) is a straight smoke pipe type flue.

9. The liquid slag discharge boiler with a modular combustion chamber according to claim 1, characterized in that: The bottom of each modular combustion chamber is connected to a respective ash hopper (13).

10. A peak load regulation method for a liquid slag discharge boiler with a modular combustion chamber according to claim 1, characterized in that: This includes the following two situations: When the boiler of the thermal power plant is generating electricity normally, the four modular combustion chambers are operating normally, and the pulverized coal and air are mixed in the pulverized coal balance distributor (7) and then burned in the respective modular combustion chambers under the action of the fan (5); When the thermal power plant is in peak load regulation, any one, two or three of the four modular combustion chambers operate normally, and the pulverized coal and air are mixed in the pulverized coal balance distributor (7) and then burned in the respective modular combustion chambers under the action of the fan (5).

Images