A direct-fired boiler heating start-up system

Abstract

The application provides a direct-flow boiler heating starting system, relates to the technical field of heating systems, and comprises an air preheater, one end of the air preheater is provided with a primary air fan and an induced draft fan, the other end of the air preheater is sequentially connected with a hot primary air duct heating device, a starting coal mill, a boiler heating surface mechanism and a denitration mechanism, the output end of the denitration mechanism is communicated with the air preheater; and the fuel recovery end of the hot primary air duct heating device is provided with a heat recovery oil receiving basin. The heating starting system is used to replace the traditional starting boiler entity to heat and start the direct-flow boiler, the system equipment is more light and small in size compared with the traditional starting boiler, is easy to maintain and overhaul, meanwhile, the heat recovery oil receiving basin is arranged to reprocess the fuel discharged from the hot primary air duct heating device, recycle the heat in the fuel and convey the heat to the air preheater to recycle the heat, so that resources are saved and the operation cost of the direct-flow boiler is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating system, in particular to a direct flow boiler heating starting system. BACKGROUND

[0002] The direct flow boiler is a boiler equipment used in the starting and black starting process of the modern supercritical or ultra-supercritical thermal power plant, mainly used for providing the steam required by the starting boiler, and plays an important role in the starting stage of the power plant.

[0003] The existing direct flow boiler often appears cold starting and black starting in the use process. The cold starting refers to starting from the room temperature or the state close to the room temperature in the initial state, and the black starting refers to restarting the direct flow boiler due to abnormality or planned maintenance during the operation of the direct flow boiler. In view of the phenomenon of cold starting and black starting, the starting boiler is usually provided during the construction, the steam produced by the starting boiler is supplied to the bypass air heater, the pulverized coal is dried to the condition meeting the ignition temperature, so as to start the coal mill and ensure the normal operation of the direct flow boiler.

[0004] However, the auxiliary operation of the direct flow boiler by the starting boiler has the following disadvantages:

[0005] (1) The starting boiler is a high-pressure container special equipment, which must be maintained and repaired regularly throughout the year, consumes high cost, occupies land resources without use, and is in the dilemma of resource consumption and no income of funds.

[0006] (2) The starting boiler needs to use fuel (such as fuel oil) for combustion during operation, and the fuel often has the problem of insufficient combustion during combustion. Therefore, the insufficiently combusted fuel is recovered, but due to the lack of corresponding components for heat recycling of the recovered fuel, the heat in the recovered fuel is wasted, increasing the operation cost of the direct flow boiler. SUMMARY

[0007] The present application provides a direct flow boiler heating starting system to solve at least one of the above technical problems.

[0008] In order to solve the above technical problems, the present application discloses a direct flow boiler heating starting system, which comprises an air preheater, one end of the air preheater is provided with a primary air fan and an induced draft fan, the other end of the air preheater is connected with a primary air duct heating device, a starting coal mill, a boiler heating surface mechanism and a denitration mechanism in sequence, and the output end of the denitration mechanism is communicated with the air preheater.

[0009] The boiler heating surface mechanism is communicated with an auxiliary steam header, a bypass steam air heater is arranged between the primary air duct heating device and the starting coal mill, the auxiliary steam header is communicated with the bypass steam air heater, and the denitration mechanism and the auxiliary steam header are communicated through an ammonia gas evaporation mechanism.

[0010] The primary air duct heating device is communicated with a fuel platform and an oil discharge mechanism, and a heat recovery oil receiving basin is arranged at the fuel recovery end of the primary air duct heating device.

[0011] Preferably, the primary air duct heating device comprises a heating air duct tail section, an oil blocking groove is arranged in the heating air duct tail section, an observation window is arranged on the heating air duct tail section, a refractory plate is arranged on the heating air duct tail section, a base is arranged on the refractory plate, and an oil gun is arranged on the base.

[0012] Preferably, the primary air duct heating device further comprises a fire-fighting device arranged at the top of the heating air duct tail section.

[0013] Preferably, the oil discharge mechanism comprises an oil discharge pipeline, two stop valves, a perspective device and a heat recovery oil receiving basin, the oil discharge pipeline is communicated with the heating air duct tail section, the stop valves are arranged at the two ends of the oil discharge pipeline, the perspective device is arranged between the two stop valves, and the heat recovery oil receiving basin is arranged at the bottom of the oil discharge pipeline.

[0014] Preferably, the primary air duct heating device further comprises:

[0015] A temperature monitoring system arranged on the primary air duct heating device, used for monitoring the temperature of flue gas in the primary air duct heating device;

[0016] A remote fire detection system arranged on the primary air duct heating device, used for detecting the flame condition in the combustion process to ensure the normal combustion and stability of the flame.

[0017] Preferably, the primary air duct heating device further comprises a sound wave soot blower arranged on the denitration mechanism and the air preheater.

[0018] Preferably, the heat recovery oil receiving basin comprises a basin body, a heat conducting wall is arranged in the basin body, the heat conducting wall divides the heat recovery oil receiving basin into a fuel recovery cavity and a water storage cavity, the oil discharge pipeline is communicated with the inlet end of the fuel recovery cavity, the outlet end of the fuel recovery cavity is communicated with the oil gun through a fuel recovery pipeline, the inlet end of the water storage cavity is communicated with an external water source, the outlet end of the water storage cavity is communicated with the air preheater through a gas communication pipe of a connecting assembly, the water storage cavity is rotatably connected with a first rotating shaft and a second rotating shaft, a first belt wheel, a bevel gear and a plurality of first stirring paddles are fixedly connected to the first rotating shaft, a second belt wheel and a plurality of second stirring paddles are fixedly connected to the second rotating shaft, the first belt wheel and the second belt wheel are connected through a transmission belt, and a first driving member is arranged on the first rotating shaft and used for driving the first rotating shaft to rotate.

[0019] The rotating shaft three is rotationally connected in the fuel recovery cavity, the rotating shaft three is fixedly connected with a turnover assembly receiving sleeve, a bevel gear two and a special-shaped guide ring, the bevel gear two is meshed with the bevel gear one, the turnover assembly receiving sleeve is slidably connected with a T-shaped turnover cylinder, the T-shaped turnover cylinder is fixedly connected with a guide ring matched sliding block, the guide ring matched sliding block is slidably connected on the upper surface of the special-shaped guide ring, the T-shaped turnover cylinder is fixedly connected with a turnover guide block, the turnover guide block is fixedly connected with the turnover assembly receiving sleeve through an elastic element one, the T-shaped turnover cylinder is fixedly connected with a turnover disc, the turnover disc is fixedly connected with a residue filter screen, the residue filter screen is fixedly connected with a residue storage block, the residue storage block is provided with a residue storage cavity, and the annular sliding groove of the turnover disc is slidably connected with an electric scraping strip.

[0020] Preferably, the basin body is provided with a residue discharging mechanism, the residue discharging mechanism comprises a brush, the brush is fixedly connected to the rotating shaft three, the bottom of the fuel recovery cavity is provided with a residue discharging channel, the residue discharging channel is rotationally connected with a gate shaft, the gate shaft is fixedly connected with a gate and a bevel gear three, the gate is rotationally connected in the residue discharging channel, the basin body is rotationally connected with a rotating shaft four and a rotating shaft five, the rotating shaft four is fixedly connected with a bevel gear four and a gear one, the bevel gear four is meshed with the bevel gear three, the rotating shaft five is rotationally connected with a gear two, the gear two is rotationally connected in the installation cavity one, the gear two is slidably connected with a rack one and a rack two on both sides, the rack one is meshed with the gear one at an end away from the gear two, the rack two is located in the residue discharging channel at an end away from the gear two, the gear two is provided with a driving element two, the driving element two is used for driving the gear two to rotate, the residue discharging channel is slidably connected with a sediment screen, the sediment screen is provided with a pressure sensor, the pressure sensor is electrically connected with the driving element two, the sediment screen is connected with the inner wall of the residue discharging channel through an elastic element two, the bottom of the residue discharging channel is provided with a backflow channel, the backflow channel is communicated with the fuel recovery cavity at an end away from the residue discharging channel, and the backflow channel is provided with a backflow pump, the residue discharging channel is provided with an impurity discharging outlet, the impurity discharging outlet is provided with a residue gate, the rotating shaft four is fixedly connected with a winding wheel, the winding wheel is wound with a winding line, the basin body is slidably connected with a blocking plate, the blocking plate is connected with the basin body through an elastic element three, and an end of the winding line away from the winding wheel is fixedly connected to the blocking plate.

[0021] Preferably, the connecting assembly comprises a main steam channel and a steam branch one, the main steam channel is communicated with the top of the water storage cavity, the steam branch one is communicated with the main steam channel through a spring abutting valve, the basin body is rotationally connected with an intermediate gear, the intermediate gear is meshed with a pushing rack one and a pushing rack two on both sides, the pushing rack one is connected with the inner wall of the steam branch one through a reset elastic element, the pushing rack two is fixedly connected with a wedge-shaped block one, the main steam channel is fixedly connected with a wedge-shaped block two, and the gas communication pipe is connected to the outlet end of the main steam channel.

[0022] Preferably, the connecting assembly comprises a main steam channel and a steam branch one, the main steam channel is communicated with the top of the water storage cavity, the steam branch one is communicated with the main steam channel through a spring abutting valve, the basin body is rotationally connected with an intermediate gear, the intermediate gear is meshed with a pushing rack one and a pushing rack two on both sides, the pushing rack one is connected with the inner wall of the steam branch one through a reset elastic element, the pushing rack two is fixedly connected with a wedge-shaped block one, the main steam channel is fixedly connected with a wedge-shaped block two, and the gas communication pipe is connected to the outlet end of the main steam channel.

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention uses a heating start-up system to heat and start up a DC boiler instead of a traditional start-up boiler. The system is lighter and more compact than a traditional start-up boiler, occupies less space, and is easier to maintain and repair. At the same time, a heat recovery oil collection basin is set up to reprocess the fuel oil discharged from the primary air duct heating device, recover the heat from it, and send it to the air preheater for reuse, thus saving resources and reducing the operating cost of the DC boiler. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of the DC furnace air duct heating black start system of the present invention;

[0028] Figure 2 A schematic diagram of the primary air duct heating device of the present invention;

[0029] Figure 3 This is a schematic diagram of the heat recovery oil receiving basin structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the storage sleeve structure for the flipping component of the present invention;

[0031] Figure 5 This is a schematic diagram of the filter screen structure of the present invention;

[0032] Figure 6 This is a cross-sectional view of the heat recovery oil receiving basin of the present invention;

[0033] Figure 7 For the present invention Figure 6 Sectional view at point AA;

[0034] Figure 8 For the present invention Figure 3 A magnified view of section B.

[0035] In the figure: 1, primary air fan; 2, primary air duct heating device; 3, bypass steam air heater; 4, start-up coal mill; 5, boiler heating surface mechanism; 6, fuel oil platform; 7, denitration mechanism; 8, air preheater; 9, auxiliary steam header; 10, ammonia gas evaporation mechanism; 11, induced draft fan; 21, heating air duct tail section; 22, oil blocking groove; 23, observation window; 24, fire-fighting device; 25, refractory plate; 26, base; 27, oil gun; 31, oil discharge pipeline; 32, stop valve; 33, perspective device; 34, heat recovery oil collection basin; 340, basin body; 341, heat-conducting wall; 342, fuel oil recovery cavity; 343, water storage cavity; 344, rotating shaft one; 345, rotating shaft two; 346, pulley one; 347, stirring paddle one; 348, pulley two; 349, stirring paddle two; 35, bevel gear one; 350, rotating shaft three; 351, turnover assembly storage sleeve; 352, bevel gear two; 353, special-shaped guide ring; 354, T-shaped turnover cylinder; 355, turnover guide block; 356, elastic member one; 357, turnover disc; 358, residue filtering net; 359, residue storage cavity; 39, annular slide groove; 390, electrically-driven scraping strip; 391, fuel oil recovery pipeline; 392, transmission belt; 393, guide ring matching sliding block; 394, residue storage block; 40, connecting assembly; 400, main steam passage; 401, steam branch one; 402, steam branch two; 4020, fire-fighting electromagnetic valve; 4021, fire-fighting connecting pipe; 403, spring abutting valve; 404, intermediate gear; 405, pushing rack one; 406, pushing rack two; 407, reset elastic member; 408, wedge block one; 409, wedge block two; 41, gas communication pipe; 42, brush; 420, residue discharge passage; 421, shutter rotating shaft; 422, shutter; 423, bevel gear three; 424, rotating shaft four; 425, bevel gear four; 426, gear one; 427, rotating shaft five; 428, gear two; 429, mounting cavity one; 43, rack one; 430, rack two; 431, deposition net; 432, elastic member two; 433, backflow pump; 434, impurity discharge outlet; 435, residue discharge shutter; 436, winding wheel; 437, winding; 438, blocking plate; 439, elastic member three; 44, backflow passage. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present application will be described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to explain and illustrate the present application, and are not used to limit the present application.

[0037] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and is not intended to particularly indicate the order or sequence, nor to limit the present application, which is merely to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0038] The present application provides the following embodiments

[0039] Embodiment 1

[0040] The embodiment of the present application provides a direct boiler heating starting system, as shown in the figure, comprising an air preheater 8, one end of the air preheater 8 is provided with a primary fan 1 and an induced draft fan 11, the other end of the air preheater 8 is connected with a primary air duct heating device 2, a starting coal mill 4, a boiler heating surface mechanism 5 and a denitration mechanism 7 in sequence, and the output end of the denitration mechanism 7 is communicated with the air preheater 8; Figures 1-8

[0041] The boiler heating surface mechanism 5 is communicated with an auxiliary steam header 9, a bypass steam air heater 3 is arranged between the primary air duct heating device 2 and the starting coal mill 4, the auxiliary steam header 9 is communicated with the bypass steam air heater 3, and the denitration mechanism 7 and the auxiliary steam header 9 are communicated through an ammonia gas evaporation mechanism 10;

[0042] The primary air duct heating device 2 is communicated with a fuel platform 6 and an oil discharge mechanism, and the fuel recovery end of the primary air duct heating device 2 is provided with a heat recovery oil basin 34.

[0043] Preferably, it further comprises:

[0044] A temperature monitoring system is arranged on the primary air duct heating device 2, and is used for monitoring the temperature of flue gas in the primary air duct heating device 2;

[0045] A remote fire detection system is arranged on the primary air duct heating device 2, and is used for detecting the flame condition in the combustion process, so as to ensure the normal combustion and stability of the flame.

[0046] ​The working principle and beneficial effects of the above technical solution are: the flue gas process of the present application: the flue gas is introduced into the air preheater 8 by the primary air fan 1, the air preheater 8 pre-processes the flue gas, then the flue gas is heated by the primary air duct heating device 2, then the heated flue gas is introduced into the boiler heating surface mechanism 5 to provide fuel for the boiler, the boiler heating surface mechanism 5 receives flue gas and coal powder and generates steam by burning, the steam output by the boiler heating surface mechanism 5 is used for power generation, the flue gas output by the boiler heating surface mechanism 5 flows to the denitration mechanism 7 for denitration treatment, the flue gas after denitration treatment passes through the air preheater 8 again, and finally is discharged by the induced draft fan 11; the steam process: the steam generated by the boiler heating surface mechanism 5 is distributed by the auxiliary steam header 9, and is supplied to the bypass steam air heater 3, the air preheater 8 and the ammonia gas evaporation mechanism 10 respectively, so as to improve the energy utilization rate; the fuel oil process: the fuel oil platform 6 provides fuel oil for the primary air duct heating device 2, and finally is discharged by the oil discharge mechanism, and the heat recovery oil basin 34 is used for reprocessing the fuel oil discharged by the primary air duct heating device 2, recovering the heat in it and conveying it to the air preheater 8 for heat recycling;

[0047] Wherein, the remote flame detection system is a kind of flame detection system, fixedly connected at the top of the heating air duct tail section. It is mainly used for detecting the flame condition in the combustion process to ensure the normal combustion and stability of the flame. Remote flame detection can monitor the flame state remotely through sensors or cameras and the like, and issue an alarm when an anomaly is found, so that timely measures can be taken for repair or adjustment;

[0048] The present application adopts a heating starting system to replace the traditional starting boiler entity to heat and start the once-through boiler, the system device is more light and small in size compared with the traditional starting boiler, occupies smaller area and is easy to maintain and overhaul, and the heat recovery oil basin 34 is arranged to reprocess the fuel oil discharged by the primary air duct heating device 2, recover the heat in it and convey it to the air preheater 8 for heat recycling, thereby saving resources and reducing the operation cost of the once-through boiler.

[0049] Example 2

[0050] On the basis of example 1, the primary air duct heating device 2 includes a heating air duct tail section 21, an oil baffle 22 is arranged in the heating air duct tail section 21, an observation window 23 is arranged on the heating air duct tail section 21, a refractory plate 25 is arranged on the heating air duct tail section 21, a base 26 is arranged on the refractory plate 25, and an oil gun 27 is arranged on the base 26.

[0051] The working principle and beneficial effects of the above technical solution are as follows: in operation, the oil gun 27 sprays fuel to introduce flame into the heating air duct, thereby providing heat for the flue gas entering the primary air duct heating device 2, the temperature of the oil gun 27 flame heats the flue gas better through the refractory plate 25, and the observation window 23 is used to observe the condition of the flue gas in the primary air duct heating device 2, so as to monitor and maintain.

[0052] Embodiment 3

[0053] On the basis of embodiment 2, the oil discharge mechanism includes an oil discharge pipeline 31, two stop valves 32, a perspective device 33, and a heat recovery oil basin 34. The oil discharge pipeline 31 is in communication with the tail section 21 of the heating air duct, the stop valves 32 are installed at both ends of the oil discharge pipeline 31, the perspective device 33 is arranged between the two stop valves 32, and the heat recovery oil basin 34 is arranged at the bottom of the oil discharge pipeline 31.

[0054] The working principle and beneficial effects of the above technical solution are as follows: when it is necessary to discharge the fuel in the tail section 21 of the heating air duct, the operator opens the stop valves 32, so that the oil can flow out through the oil discharge pipeline 31. The flow condition of the oil can be observed in real time through the perspective device 33, so as to ensure that the oil discharge process is normal. The oil is guided into the heat recovery oil basin 34 through the oil discharge pipeline 31 for collection and treatment. Once the oil discharge is completed, the operator can close the stop valves 32.

[0055] Embodiment 4

[0056] On the basis of embodiment 3, the heat recovery oil basin 34 includes a basin body 340, a heat-conducting wall 341 is arranged in the basin body 340, the heat-conducting wall 341 divides the heat recovery oil basin 34 into a fuel recovery cavity 342 and a water storage cavity 343, the oil discharge pipeline 31 is in communication with the inlet end of the fuel recovery cavity 342, the outlet end of the fuel recovery cavity 342 is in communication with the oil gun 27 through a fuel recovery pipeline 391, the inlet end of the water storage cavity 343 is in communication with an external water source, the outlet end of the water storage cavity 343 is in communication with the air preheater 8 through a connecting assembly 40, the water storage cavity 343 is rotatably connected with a first rotating shaft 344 and a second rotating shaft 345, the first rotating shaft 344 is fixedly connected with a belt pulley 346, a bevel gear 35, and a plurality of stirring paddles 347, the second rotating shaft 345 is fixedly connected with a belt pulley 348 and a plurality of stirring paddles 349, the belt pulley 346 and the belt pulley 348 are connected through a transmission belt 392, and a driving member 1 is arranged on the first rotating shaft 344 and used to drive the first rotating shaft 344 to rotate.

[0057] The rotating shaft three 350 is rotationally connected in the fuel recovery cavity 342, the rotating shaft three 350 is fixedly connected with the turnover assembly receiving sleeve 351, the bevel gear two 352 and the special-shaped guide ring 353, the bevel gear two 352 is meshed with the bevel gear one 35, the T-shaped turnover cylinder 354 is slidably connected in the turnover assembly receiving sleeve 351, the T-shaped turnover cylinder 354 is fixedly connected with the guide ring matching sliding block 393, the guide ring matching sliding block 393 is slidably connected on the upper surface of the special-shaped guide ring 353, the T-shaped turnover cylinder 354 is fixedly connected with the turnover guide block 355, the turnover guide block 355 is fixedly connected between the T-shaped turnover cylinder 354 and the turnover assembly receiving sleeve 351 through the elastic piece one 356, the T-shaped turnover cylinder 354 is fixedly connected with the turnover disc 357, the turnover disc 357 is fixedly connected with the residue filter net 358, the residue filter net 358 is fixedly connected with the residue storage block 394, the residue storage block 394 is provided with the residue storage cavity 359 in the residue storage block 394, and the electric scraping strip 390 is slidably connected in the annular sliding groove 39 of the turnover disc 357.

[0058] The working principle and beneficial effects of the above technical scheme are as follows: the fuel discharged from the primary air duct heating device 2 enters the fuel recovery cavity 342 through the oil discharge pipeline 31 of the oil discharge mechanism, then the driving piece one drives the rotating shaft one 344 to rotate, the rotating shaft one 344 drives the pulley one 346, the stirring paddle one 347 and the bevel gear one 35 to rotate, the pulley one 346 drives the transmission belt 392 to drive, the transmission belt 392 drives the pulley two 348 to rotate, the pulley two 348 rotates, the pulley two 348 drives the rotating shaft two 345 to rotate, the rotating shaft two 345 drives the stirring paddle two 349 to rotate, so as to stir the water in the water storage cavity 343 and accelerate the heat exchange between the water and the fuel in the fuel recovery cavity 342, wherein the temperature of the recovered fuel is 50-120 degrees, the heat of the fuel is recovered, so as to heat the water in the water storage cavity 343, and the heated water becomes steam and enters the air preheater 8 through the connecting assembly 40 to participate in preheating, realizing the recovery and reuse of the fuel waste heat, and helping the fuel to realize rapid cooling at the same time;

[0059] The bevel gear one 35 drives the bevel gear two 352 to rotate, the bevel gear two 352 drives the rotating shaft three 350 to rotate, the rotating shaft three 350 drives the special-shaped guide ring 353 to rotate, the special-shaped guide ring 353 drives the T-shaped turnover cylinder 354 to move up and down through the guide ring matching sliding block 393, so as to turn the oil in the fuel recovery cavity 342, which can effectively accelerate the heat exchange of the fuel compared with stirring, the turnover disc 357 moves up and down in the process of turning the oil up and down, so that the impurities in the fuel adhere to the residue filter net 358, and the electric scraping strip 390 slides along the annular sliding groove 39 to scrape the impurities in the fuel adhering to the residue filter net 358 into the residue storage cavity 359, the up-and-down movement of the turnover disc 357 is more efficient than other existing impurity removal methods, and the fuel cooled and filtered enters the oil gun 27 through the fuel recovery pipeline 391 for reuse.

[0060] Example 5

[0061] On the basis of example 3, the basin 340 is provided with a slag discharge mechanism, the slag discharge mechanism includes a brush 42, the brush 42 is fixedly connected to the rotating shaft three 350, the fuel recovery cavity 342 is provided with a slag discharge channel 420 at the bottom, the slag discharge channel 420 is rotatably connected with a gate shaft 421, the gate shaft 421 is fixedly connected with a gate plate 422 and a bevel gear three 423, the gate plate 422 is rotatably connected in the slag discharge channel 420, the basin 340 is rotatably connected with a rotating shaft four 424 and a rotating shaft five 427, the rotating shaft four 424 is fixedly connected with a bevel gear four 425 and a gear one 426, the bevel gear four 425 is meshed with the bevel gear three 423, the rotating shaft five 427 is rotatably connected with a gear two 428, the gear two 428 is rotatably connected in an installation cavity one 429, the gear two 428 is slidably connected with a rack one 43 and a rack two 430 on both sides, the rack one 43 is meshed with the gear one 426 at the end away from the gear two 428, the rack two 430 is located in the slag discharge channel 420 at the end away from the gear two 428, the gear two 428 is provided with a driving part two, the driving part two is used for driving the gear two 428 to rotate, the slag discharge channel 420 is slidably connected with a sediment net 431, the sediment net 431 is provided with a pressure sensor, the pressure sensor is electrically connected with the driving part two, the sediment net 431 is connected with the inner wall of the slag discharge channel 420 through an elastic part two 432, the slag discharge channel 420 is provided with a backflow channel 44, the backflow channel 44 is communicated with the fuel recovery cavity 342 at the end away from the slag discharge channel 420, and the backflow channel 44 is provided with a backflow pump 433, the slag discharge channel 420 is provided with an impurity discharge outlet 434, the impurity discharge outlet 434 is provided with a slag discharge gate plate 435, the rotating shaft four 424 is fixedly connected with a winding wheel 436, the winding wheel 436 is wound with a winding line 437, the basin 340 is slidably connected with a blocking plate 438, the blocking plate 438 is connected with the basin 340 through an elastic part three 439, the winding line 437 is fixedly connected to the blocking plate 438 at the end away from the winding wheel 436.

[0062] The working principle and beneficial effects of the above technical solution are as follows: in the rotating process of the rotating shaft three 350, the impurities deposited at the bottom of the fuel recovery cavity 342 are swept into the slag discharge channel 420 under the action of the brush 42, the impurities are accumulated on the gate plate 422, the gate plate 422 is driven to rotate through the rotation of the gate plate rotating shaft 421, the rotation of the gate plate 422 pours the impurities on the gate plate into the deposition net 431, the fuel in the impurities can flow back into the fuel recovery cavity 342 through the deposition net 431 and the backflow pump 433 of the backflow channel 44, as the impurities deposited on the deposition net 431 increase, the actual detection value of the pressure sensor increases, when the actual detection value of the pressure sensor is greater than the preset detection value, the second driving member is started to drive the driving gear two 428 to rotate, the driving gear two 428 drives the rack one 43 to move downward, at the same time, the rack two 430 is driven to move upward, the rack one 43 drives the gear one 426 to rotate, the gear one 426 drives the rotating shaft four 424 to rotate, the rotating shaft four 424 drives the bevel gear four 425 to rotate, the bevel gear four 425 drives the bevel gear three 423 to rotate, the bevel gear three 423 drives the gate plate rotating shaft 421 to rotate, the gate plate rotating shaft 421 drives the gate plate 422 to rotate to the horizontal state, at the same time, the rack two 430 moves upward to push the deposition net 431 to the inclined state, at this time, the slag gate plate 435 is in the open state, the impurities on the deposition net 431 are discharged through the impurity discharge port 434, at the same time, the rotating shaft four 424 drives the winding wheel 436 to rotate in the rotating process, the winding wheel 436 drives the winding 437 to pull the baffle plate 438 to move downward, so that the fuel above the fuel recovery cavity 342 is recycled through the oil recovery pipeline 391 into the oil gun 27 for reuse.

[0063] Embodiment 6

[0064] On the basis of embodiment 1, the connecting assembly 40 comprises a main steam channel 400 and a steam branch one 401, the main steam channel 400 is communicated with the top of the water storage cavity 343, the steam branch one 401 is communicated with the main steam channel 400 through the spring abutting valve 403, the intermediate gear 404 is rotatably connected in the basin body 340, the intermediate gear 404 is meshed with the push rack one 405 and the push rack two 406 on both sides respectively, the push rack one 405 is connected with the inner wall of the steam branch one 401 through the reset elastic member 407, the wedge block one 408 is fixedly connected on the push rack two 406, the wedge block two 409 is fixedly connected in the main steam channel 400, and the gas communication pipe 41 is connected at the outlet end of the main steam channel 400.

[0065] Further comprising a steam branch two 402, the steam branch two 402 is provided with a fire-fighting electromagnetic valve 4020, the water storage cavity 343 is communicated with a fire-fighting connecting pipe 4021 at the bottom, and the fire-fighting connecting pipe 4021 is communicated with the fire-fighting device 24.

[0066] The working principle and beneficial effects of the above technical solution are as follows: as the temperature in the water storage cavity 343 increases, the water in the water storage cavity 343 is converted into water vapor, so that the air pressure in the water storage cavity 343 increases; when the actual air pressure value in the water storage cavity 343 increases to exceed the preset air pressure value, the spring abutting valve 403 is opened under the action of the air pressure, so that the steam enters the steam branch one 401 through the spring abutting valve 403; the steam entering the steam branch one 401 pushes the driving rack one 405 to move upward under the action of the air pressure; the upward movement of the driving rack one 405 drives the intermediate gear 404 to rotate; the rotation of the intermediate gear 404 drives the driving rack two 406 to move downward; the downward movement of the driving rack two 406 drives the wedge block one 408 to move downward; the downward movement of the wedge block one 408 generates a gap with the wedge block two 409, so that the steam entering the main steam passage 400 can enter the air preheater 8 through the gap and the gas communication pipe 41, realizing the recycling of heat; as the generated steam continuously enters the air preheater 8, the actual air pressure value in the water storage cavity 343 will gradually decrease to be less than the preset air pressure value; at this time, the spring abutting valve 403 is closed, the driving rack one 405 and the driving rack two 406 are reset, and the wedge block one 408 and the wedge block two 409 are re-coordinated, so as to ensure the actual temperature of the steam entering the air preheater 8.

[0067] When the fire-fighting device 24 needs to be pressurized during the working process, the fire-fighting electromagnetic valve 4020 opens the steam in the water storage cavity 343 to enter the fire-fighting connecting pipe 4021 through the steam branch two 402, and the water in the water storage cavity 343 also enters the fire-fighting connecting pipe 4021; the water is flushed into the fire-fighting device 24 under the action of the steam pressure to assist in completing the fire-fighting work.

[0068] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A direct fired boiler heating start-up system characterized by: The air preheater (8) is provided with a primary air fan (1) and an induced draft fan (11) at one end, and is sequentially connected with a primary air duct heating device (2), a starting coal mill (4), a boiler heating surface mechanism (5) and a denitration mechanism (7) at the other end, and the denitration mechanism (7) is communicated with the air preheater (8); The boiler heating surface mechanism (5) is communicated with an auxiliary steam header (9), a bypass steam air heater (3) is arranged between the primary air duct heating device (2) and the starting coal mill (4), the auxiliary steam header (9) is communicated with the bypass steam air heater (3), and the denitration mechanism (7) and the auxiliary steam header (9) are communicated through an ammonia gas evaporation mechanism (10); The primary air duct heating device (2) is communicated with a fuel oil platform (6) and an oil discharging mechanism, and the fuel oil recovery end of the primary air duct heating device (2) is provided with a heat recovery oil receiving basin (34) which is communicated with the air preheater (8); The primary air duct heating device (2) comprises a heating air duct tail section (21), the heating air duct tail section (21) is provided with an oil blocking groove (22), the heating air duct tail section (21) is provided with an observation window (23), the heating air duct tail section (21) is provided with a refractory plate (25), the refractory plate (25) is provided with a base (26), and the base (26) is provided with an oil gun (27); The oil discharging mechanism comprises an oil discharging pipeline (31), two stop valves (32), a perspective device (33) and the heat recovery oil receiving basin (34), the oil discharging pipeline (31) is communicated with the heating air duct tail section (21), the stop valves (32) are installed at two ends of the oil discharging pipeline (31), the perspective device (33) is arranged between the two stop valves (32), and the heat recovery oil receiving basin (34) is arranged at the bottom of the oil discharging pipeline (31); The heat recovery oil receiving basin (34) comprises a basin body (340), the basin body (340) is provided with a heat conduction wall (341), the heat conduction wall (341) divides the heat recovery oil receiving basin (34) into a fuel oil recovery cavity (342) and a water storage cavity (343), the oil discharging pipeline (31) is communicated with the inlet end of the fuel oil recovery cavity (342), the outlet end of the fuel oil recovery cavity (342) is communicated with the oil gun (27) through a fuel oil recovery pipeline (391), the inlet end of the water storage cavity (343) is communicated with an external water source, the outlet end of the water storage cavity (343) is communicated with the air preheater (8) through a gas communication pipe (41) of a connecting assembly (40), the water storage cavity (343) is rotatably connected with a first rotating shaft (344) and a second rotating shaft (345), the first rotating shaft (344) is fixedly connected with a belt pulley (346), a bevel gear (35) and a plurality of stirring paddles (347), the second rotating shaft (345) is fixedly connected with a belt pulley (348) and a plurality of stirring paddles (349), the belt pulley (346) and the belt pulley (348) are connected through a transmission belt (392), and the first rotating shaft (344) is provided with a driving member (one). The fuel recovery cavity (342) is rotatably connected with a rotating shaft three (350), the rotating shaft three (350) is fixedly connected with a turnover assembly receiving sleeve (351), a bevel gear two (352) and a special-shaped guide ring (353), the bevel gear two (352) is engaged with the bevel gear one (35), the turnover assembly receiving sleeve (351) is slidably connected with a T-shaped turnover cylinder (354) in the turnover assembly receiving sleeve (351), the T-shaped turnover cylinder (354) is fixedly connected with a guide ring matching slider (393), the guide ring matching slider (393) is slidably connected on the upper surface of the special-shaped guide ring (353), the T-shaped turnover cylinder (354) is fixedly connected with a turnover guide block (355), the turnover guide block (355) and the turnover assembly receiving sleeve (351) are fixedly connected through an elastic element one (356), the T-shaped turnover cylinder (354) is fixedly connected with a turnover disc (357), the turnover disc (357) is fixedly connected with a residue filter net (358), the residue filter net (358) is fixedly connected with a residue storage block (394), the residue storage block (394) is provided with a residue storage cavity (359), and the annular sliding groove (39) of the turnover disc (357) is slidably connected with an electric scraping strip (390).

2. A direct fired boiler heating start-up system as set forth in claim 1, characterized in that: The fire-fighting device (24) is arranged at the top of the heating air duct tail section (21).

3. A direct fired boiler heating start-up system as set forth in claim 1, characterized in that: Further comprising: A temperature monitoring system is arranged on the primary air duct heating device (2) and is used for monitoring the temperature of flue gas in the primary air duct heating device (2); A remote fire detection system is arranged on the primary air duct heating device (2) and is used for detecting the flame condition in the combustion process to ensure the normal combustion and stability of the flame.

4. A direct fired boiler heating start-up system as set forth in claim 1, characterized in that: Further comprising a sound wave soot blower arranged on the denitration mechanism (7) and the air preheater (8).

5. A direct fired boiler heating start-up system as set forth in claim 1, characterized in that: The basin (340) is provided with a residue discharging mechanism, the residue discharging mechanism comprises a brush (42), the brush (42) is fixedly connected to the rotating shaft three (350), a residue discharging passage (420) is formed in the bottom of the fuel recovery cavity (342), a gate rotating shaft (421) is rotatably connected in the residue discharging passage (420), a gate (422) and a bevel gear three (423) are fixedly connected to the gate rotating shaft (421), the gate (422) is rotatably connected in the residue discharging passage (420), a rotating shaft four (424) and a rotating shaft five (427) are rotatably connected in the basin (340), a bevel gear four (425) and a gear one (426) are fixedly connected to the rotating shaft four (424), the bevel gear four (425) and the bevel gear three (423) are meshed with each other, a gear two (428) is rotatably connected to the rotating shaft five (427), the gear two (428) is rotatably connected in an installation cavity one (429), a rack one (43) and a rack two (430) are slidably connected to the two sides of the gear two (428), one end of the rack one (43) away from the gear two (428) is meshed with the gear one (426), one end of the rack two (430) away from the gear two (428) is located in the residue discharging passage (420), a driving element two is arranged on the gear two (428) and used for driving the gear two (428) to rotate, a deposition net (431) is slidably connected in the residue discharging passage (420), a pressure sensor is arranged on the deposition net (431), the pressure sensor is electrically connected with the driving element two, the deposition net (431) and the inner wall of the residue discharging passage (420) are connected through an elastic element two (432), a backflow passage (44) is arranged at the bottom of the residue discharging passage (420), one end of the backflow passage (44) away from the residue discharging passage (420) is communicated with the fuel recovery cavity (342), a backflow pump (433) is arranged in the backflow passage (44), an impurity discharging outlet (434) is arranged on the residue discharging passage (420), a residue discharging gate (435) is arranged in the impurity discharging outlet (434), a winding wheel (436) is fixedly connected to the rotating shaft four (424), a winding wire (437) is wound on the winding wheel (436), a blocking plate (438) is slidably connected in the basin (340), the blocking plate (438) and the basin (340) are connected through an elastic element three (439), one end of the winding wire (437) away from the winding wheel (436) is fixedly connected to the blocking plate (438).

6. A direct fired boiler heating start-up system as set forth in claim 1, characterized in that: The connecting assembly (40) comprises a main steam passage (400) and a steam branch one (401), the main steam passage (400) communicates with the top of the water storage cavity (343), the steam branch one (401) communicates with the main steam passage (400) through a spring abutting valve (403), the basin body (340) is rotationally connected with an intermediate gear (404), the intermediate gear (404) is meshed with a pushing rack one (405) and a pushing rack two (406) on both sides respectively, the pushing rack one (405) is connected with the inner wall of the steam branch one (401) through a reset elastic element (407), the pushing rack two (406) is fixedly connected with a wedge block one (408), the main steam passage (400) is fixedly connected with a wedge block two (409), and the gas communication pipe (41) is connected at the outlet end of the main steam passage (400).

7. A direct flow boiler heating start-up system according to claim 6, characterized in that: The steam branch two (402) is further provided with a fire-fighting electromagnetic valve (4020), the bottom of the water storage cavity (343) is communicated with a fire-fighting connecting pipe (4021), and the fire-fighting connecting pipe (4021) communicates with the fire-fighting device (24).

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