A flue gas purification and heat recovery device for a heating furnace and a control method thereof

Abstract

The present invention discloses a flue gas purification and heat recovery device for a heating furnace and a control method thereof, aiming to provide a flue gas purification and heat recovery device for a heating furnace with high energy utilization rate, good energy-saving effect and reduced air pollution. The key points of the technical scheme are that a plurality of winding air outlet passages are connected to the air outlet, thereby increasing the residence time of the flue gas in the air outlet passage. When cooperated with a heat exchanger, the heat exchange time is increased, and the overall heat recovery effect is improved. The present invention has strong practicality and simple structure. The heat recovery part includes a heat exchanger coated outside the air outlet passage and a slow flow mechanism arranged in the air outlet passage. The contact effect between the heat exchangers is increased through the coating structure, and the slow flow mechanism buffers the flow speed of the flue gas, increases the contact time between the heat exchangers, and forms a large degree of heat conversion. The present invention is suitable for the technical field of heat energy recovery of flue gas in heating furnaces.

Description

Technical Field

[0001] The present invention relates to the technical field of heat energy recovery of flue gas from a heating furnace, and more specifically, to a flue gas purification and heat recovery device for a heating furnace and a control method thereof. Background Art

[0002] Many steel mills in my country attach great importance to the utilization of waste heat from heating furnaces and have carried out corresponding development and application, such as adding air (coal) gas preheaters in the flue, using regenerative combustion technology, and using vaporization cooling for the water beams of heating furnaces. These measures have played a good role in energy saving. The utilization of heat loss generated by cooling the water beams and columns of the heating furnace, at present, domestic and foreign countries mostly use vaporization cooling systems to recover the lost heat.

[0003] The flue gas from the heating furnace has a high temperature, and the waste of waste heat from the flue gas is a major problem for energy waste. To address the above problem, water can be heated to form steam, which is then converted and stored into electrical energy through a steam turbine to improve energy utilization. However, since the flow rate of the flue gas is too fast when it enters the flue, it cannot fully and effectively absorb all the heat of the flue gas, and most of the energy is still lost. In addition, improving the purification effect of the flue gas and reducing pollution to the environment are also current problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a flue gas purification and heat recovery device for a heating furnace which has high energy utilization rate, good energy-saving effect and reduces air pollution.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a flue gas purification and heat recovery device for a heating furnace, comprising a furnace body, a furnace cavity being arranged in the furnace body, the furnace cavity being provided with an air inlet and an air outlet, the air outlet being connected to a multi-section tortuous air outlet passage, the air outlet passage being connected in sequence to a heat recovery part and a purification treatment part, the heat recovery part comprising a heat exchanger coated on the outside of the air outlet passage and a slow flow mechanism arranged in the air outlet passage, the purification treatment part comprising an air storage chamber communicated with the air outlet passage, a purification passage connected to the air storage chamber, a purifier arranged in the purification passage, a pushing device arranged in the air storage chamber and used for pushing the flue gas into the purification passage, and a pressure control mechanism arranged between the purification passage and the pushing device.

[0006] The present invention is further configured as follows: the slow flow mechanism includes an internal mounting structure arranged in the air outlet channel, a main shaft body arranged in the internal mounting structure and closed at both ends, and at least two curved surface guide bodies arranged on the side of the main shaft body and rotating in the same direction and evenly distributed in a spiral structure, the spiral center line of the curved surface guide body is arranged along the axis direction of the main shaft body, the curved surface guide body guides the direction of the flue gas to form a directional movement, and the curved surface guide body guides the hot air to form a slow swirl along the shape of the blades.

[0007] The present invention is further configured such that: the flow slowing mechanism is located at the entrance of the air outlet channel and / or the tortuous part of the air outlet channel body, and when the flow slowing mechanism is located at the tortuous part, a centrifugal area is formed in the part, and the hot air passing through the centrifugal area maintains the speed and direction at the time of entry, forming a centrifugal motion and decelerating the airflow again.

[0008] The present invention is further configured as follows: the pressure control mechanism includes a control flow channel connected to the purification channel and a control component arranged in the control flow channel and used to control the purification speed of the smoke after entering the purification channel, the control flow channel includes a first flow channel and a second flow channel arranged in parallel with each other, the first flow channel is connected to the purification channel, the control component includes a first piston movably arranged in the first flow channel, a second piston arranged in the second flow channel, a connecting rod connecting the rod body part of the first piston and the rod body part of the second piston in sequence, and a pressure control component arranged in the first and second flow channels, and the pushing device is connected to the connecting rod.

[0009] The present invention is further configured as follows: the pressure control component includes a disk body arranged on the first piston and on one side of the rod cavity, a channel A arranged in the rod body portion of the first piston, a channel B running through the rod body portion of the second piston, a channel C arranged on the connecting rod and connecting channel A and channel B in sequence, a transverse channel arranged on the disk body and connected to channel A, and an air outlet channel arranged on the disk body and perpendicular to the transverse channel, an air outlet is arranged on one side of the rod cavity of the first flow channel, and the air outlet channel and the air outlet are connected to each other.

[0010] The present invention is further configured as follows: a plurality of inner mounting cavities are opened on the circumferential side of the disk body and are arranged along the radial direction of the disk body, each inner mounting cavity is arranged in the transverse channel, and an inner spring and a slidable pressure block are arranged in the inner mounting cavity, and the pressure block slides toward the axial direction of the disk body under the tension of the inner spring.

[0011] The present invention is further configured as follows: an intake check valve is provided on the inner wall of the rodless cavity of the second flow channel, and the intake check valve is configured so that when the second piston is away from the intake check valve, the airflow is a passage; otherwise, the airflow is a disconnection.

[0012] The present invention is further configured as follows: the inner diameters of the channels A, B, and C are all the same and are larger than the inner diameter of the transverse channel, and the inner diameter of the transverse channel is larger than the inner diameter of the air outlet channel.

[0013] The present invention is further configured as follows: the air storage chamber includes a left air chamber connected to the air outlet channel, a right air chamber connected to the left air chamber on one side and the purification channel on the other side, and an on-off structure arranged on the left and right air chambers, the on-off structure includes an A plate isolating the left and right air chambers, an air vent A arranged on the A plate, a B plate arranged on the A plate and movably connected to the A plate, an air vent B arranged on the B plate, and a driving cylinder arranged outside the air storage chamber and used to drive the B plate to move and form the on-off of the air vents A and B.

[0014] By adopting the above technical scheme, the beneficial effects are as follows: 1. By connecting a plurality of winding air outlet passages to the air outlet, the air outlet passage structure of the above structure increases the residence time of the flue gas in the air outlet passage, and when cooperating with the heat exchanger, increases the heat exchange time, improves the overall heat recovery effect, has strong practicality and simple structure, and the heat recovery part includes a heat exchanger coated outside the air outlet passage and a slow flow mechanism arranged in the air outlet passage, and the contact effect between the heat exchangers is increased by the coated structure, and the slow flow mechanism buffers the flow speed of the flue gas, increases the contact time between the heat exchangers, and forms a greater degree of heat conversion, and further the purification treatment part is arranged to include an air storage chamber connected to the air outlet passage, a purification passage connected to the air storage chamber, a purifier arranged in the purification passage, a pushing device arranged in the air storage chamber and used to push the flue gas into the purification passage, and a pressure control mechanism arranged between the purification passage and the pushing device, and the above structural arrangement is adopted, and the speed of flue gas purification is controlled by the pressure control mechanism to ensure a high degree of purification and strong stability;

[0015] 2. The slow flow mechanism is provided to include an inner mounting structure provided in the air outlet passage. Because the inner mounting structure is a cylindrical structure, and a main shaft body provided in the inner mounting structure and closed at both ends, and at least two curved guide bodies of a spiral structure provided on the side of the main shaft body and rotating in the same direction and evenly distributed, and the spiral center line of the curved guide body is provided along the axis direction of the main shaft body, the curved guide body guides the direction of the flue gas to form a directional movement, and the curved guide body guides the hot air to form a slow swirl along the blade shape. The width of the curved guide body is provided to match the inner diameter of the inner mounting structure, thereby increasing the overall buffering effect and improving the overall heat conversion effect.

[0016] 3. The pressure control mechanism is configured to include a control channel connected to the purification channel and a control component arranged in the control channel and used to control the purification speed of the smoke after entering the purification channel. The control channel includes a first channel and a second channel arranged in parallel with each other. The first channel is an active chamber, and the second channel is a linkage chamber. The first channel is connected to the purification channel. The control component includes a first piston movably arranged in the first channel, a second piston arranged in the second channel, and a connecting rod connecting the rod body part of the first piston and the rod body part of the second piston in sequence. The pushing device is connected to the connecting rod, and the first piston and the second piston are connected by the connecting rod, so that the three are linked. Moreover, because the first and second channels belong to different chambers, the pressures between the two are not the same. Then, the pressure control component arranged in the first and second channels is used to control the pressure of the pushing device to prevent a strong impact from being formed during startup, which affects the instability of the pushing pressure.

[0017] 4. Further, by setting the air storage chamber to include a left air chamber connected to the air outlet channel, a right air chamber connected to the left air chamber on one side and the purification channel on the other side, and a switching structure arranged on the left and right air chambers, the air storage chamber is set as a left and right chamber to form a better regulation effect, and the air storage and purification chambers are operated separately, and by setting the switching structure to include an A plate for isolating the left and right air chambers, an air vent A arranged on the A plate, a B plate arranged on the A plate and movably connected to the A plate, an air vent B arranged on the B plate, and a driving cylinder arranged outside the air storage chamber and used to drive the B plate to move and form the switching of the air vents A and B. With the above-mentioned structural setting, the switching of the air vents A and B forms mutual communication between the air chambers, ensuring that the two air chambers do not interfere with each other, improving the integrity during purification operation, and having strong stability and simple structure.

[0018] A control method for a flue gas purification and heat recovery device suitable for the above-mentioned heating furnace, further comprising a steam generating chamber connected to a heat exchanger and a steam turbine connected to the steam generating chamber, the steam turbine being electrically connected to a battery, a water level sensor being provided in the steam generating chamber, a flue gas concentration detector for detecting gas concentration being provided in the gas storage chamber, the water level sensor, the flue gas concentration detector, the driving cylinder and the pushing device being electrically connected to a controller, the controller comprising a water level receiving unit, a flue gas concentration receiving unit, a first start-stop unit for driving the driving cylinder to start and stop, and a second start-stop unit for driving the pushing device to start and stop,

[0019] The control method includes the following steps: S1, the heating furnace works normally, the smoke is discharged along the air outlet, enters the air outlet channel, and starts to exchange heat with the heat exchanger, the steam generating chamber continuously generates steam at high temperature, drives the steam turbine to generate kinetic energy, and then converts it into electrical energy and stores it in the battery, thus forming energy recovery and utilization;

[0020] S2. When the flue gas passes through the slow flow mechanism, the airflow forms a slow swirl in the blade shape of the curved surface guide body, which prolongs the contact time with the heat exchanger;

[0021] S3, after the flue gas passes through multiple tortuous air outlet channels, the air flow speed gradually slows down and enters the air storage chamber to be purified;

[0022] S4. When the smoke concentration detector in the gas storage chamber detects that the smoke concentration reaches the K value, the controller drives the B plate to move, so that the vent A and the vent B are connected to each other, and the smoke enters the right air chamber from the left air chamber until the right air chamber is saturated. The controller drives the B plate to reset, and the vent A and the vent B are not connected;

[0023] S5. The right air chamber and the purification channel form a passage, and the flue gas in the purification channel is purified by the pushing device. The pressure control mechanism controls the flow rate of the flue gas and the pressure to keep the purification speed of the flue gas ≤ P value;

[0024] S6. When the smoke concentration detector detects that the smoke concentration reaches the K value again, steps 4 and 5 are repeated;

[0025] S7, discharging the purified flue gas into the atmosphere, completing flue gas heat recovery and purification;

[0026] S8. The water level sensor detects the change of water level in real time. When there is a lack of water, it will alarm and add water to prevent empty burning.

[0027] By adopting the above technical scheme, beneficial effects are achieved. A heat exchanger is used to perform heat exchange on the flue gas in the exhaust channel, and the steam generating chamber is used as a medium. The steam drives the steam turbine, and the generated electrical energy is stored in the battery to form a closed loop. The present invention achieves sufficient conversion during heat exchange by buffering the flue gas and controlling the flow rate of the flue gas during purification. Controlling the flow rate during purification is to ensure sufficient purification of the flue gas, reduce pollution to the atmosphere, and improve the environmental protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of an embodiment of a flue gas purification and heat recovery device for a heating furnace and a control method thereof of the present invention.

[0029] Figure 2 It is a structural schematic diagram of a slow flow mechanism of a flue gas purification and heat recovery device for a heating furnace and a control method thereof according to an embodiment of the present invention.

[0030] Figure 3 The invention is a flue gas purification and heat recovery device for a heating furnace and a control method thereof. Figure 1 A magnified view of the structure in the middle.

[0031] The reference numerals in the figure are as follows: 1, furnace body; 2, furnace cavity; 20, air inlet; 21, air outlet; 3, air outlet channel; 31, slow flow mechanism; 310, internal mounting structure; 311, main shaft body; 312, curved guide body; 32, winding part; 40, air storage chamber; 401, left air chamber; 402, right air chamber; 403, A plate; 404, vent A; 405, B plate; 406, vent B; 407, driving cylinder; 41, purification vent Channel; 42, purifier; 43, driving device; 5, control channel; 51, first channel; 510, first piston; 511, channel A; 512, air outlet; 52, second channel; 520, second piston; 521, channel B; 53, connecting rod; 531, channel C; 54, disc; 541, transverse channel; 542, air outlet channel; 543, inner mounting cavity; 544, inner spring; 545, pressure block; 6, air intake check valve. DETAILED DESCRIPTION

[0032] Reference Figures 1 to 3 The present invention further describes an embodiment of a flue gas purification and heat recovery device for a heating furnace and a control method thereof.

[0033] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0034] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0035] A flue gas purification and heat recovery device for a heating furnace comprises a furnace body 1, wherein a furnace chamber 2 is arranged in the furnace body 1, and the furnace chamber 2 is provided with an air inlet 20 and an air outlet 21, the air outlet 21 is connected to an air outlet channel 3 in a tortuous shape in multiple sections, the air outlet channel 3 is connected to a heat recovery part and a purification treatment part in sequence, the heat recovery part comprises a heat exchanger coated on the outside of the air outlet channel 3 and a slow flow mechanism 31 arranged in the air outlet channel 3, the purification treatment part comprises an air storage chamber 40 communicated with the air outlet channel 3, a purification channel 41 connected to the air storage chamber, a purifier 42 arranged in the purification channel 41, a pushing device 43 arranged in the air storage chamber 40 and used for pushing the flue gas into the purification channel 41, and a pressure control mechanism arranged between the purification channel 41 and the pushing device 43, by connecting the air outlet 21 to the air outlet 3 in a tortuous shape in multiple sections, the air outlet channel 3 structure of the above structure increases the residence time of the flue gas in the air outlet channel 542, and when connected to the heat exchanger When they are coordinated, the heat exchange time is increased, and the overall heat recovery effect is improved. It is highly practical and has a simple structure. The heat recovery part includes a heat exchanger coated on the outside of the air outlet channel 3 and a slow flow mechanism 31 arranged in the air outlet channel 3. The contact effect between the heat exchangers is increased through the coated structure, and the slow flow mechanism 31 buffers the flow speed of the flue gas, increases the contact time between the heat exchangers, and forms a greater degree of heat conversion. The purification treatment part is further configured to include an air storage chamber 40 connected to the air outlet channel 3, a purification channel 41 connected to the air storage chamber, a purifier 42 arranged in the purification channel 41, a pushing device 43 arranged in the air storage chamber 40 and used to push the flue gas into the purification channel 41, and a pressure control mechanism arranged between the purification channel 41 and the pushing device 43. With the above-mentioned structural setting, the speed of flue gas purification is controlled by the pressure control mechanism to ensure a high degree of purification and strong stability.

[0036] The present invention is further configured such that the slow flow mechanism 31 includes an inner mounting structure 310 disposed in the air outlet channel 3, a main shaft body 311 disposed in the inner mounting structure 310 and closed at both ends, and at least two curved surface guide bodies 312 of a spiral structure that rotates in the same direction and is evenly distributed on the side of the main shaft body 311. The spiral center line of the curved surface guide body 312 is disposed along the axial direction of the main shaft body 311. The curved surface guide body 312 guides the direction of the flue gas to form a directional movement. The curved surface guide body 312 guides the hot air to form a slow swirl along the blade shape. By configuring the slow flow mechanism 31 to include the inner mounting structure 310 disposed in the air outlet channel 3, because the inner mounting structure The structure 310 is a cylindrical structure, and includes a main shaft body 311 which is closed at both ends and is arranged inside the inner mounting structure 310, and at least two curved flow guides 312 of a spiral structure which are arranged on the side of the main shaft body 311 and rotate in the same direction and are evenly distributed. Moreover, by setting the spiral center line of the curved flow guide 312 along the axial direction of the main shaft body 311, the curved flow guide 312 guides the direction of the flue gas to form a directional movement, and the curved flow guide 312 guides the hot air to form a slow swirl along the shape of the blades. The present invention sets the width of the curved flow guide 312 to match the inner diameter of the inner mounting structure 310, thereby increasing the overall buffering effect and improving the overall heat conversion effect.

[0037] The present invention is further configured such that the flow slowing mechanism 31 is located at the entrance of the air outlet channel 3 and / or the tortuous part 32 of the air outlet channel 3 body. In the embodiment of the present invention, the setting position of the flow slowing mechanism 31 is adjusted to achieve multi-directional deceleration. When the flow slowing mechanism 31 is located in the tortuous part 32, a centrifugal area is formed in the part. The hot air passing through the centrifugal area maintains the speed and direction at the time of entry, forming a centrifugal motion and decelerating the airflow again. The multi-stage decelerating airflow greatly increases the contact time between the flue gas and the heat exchanger, improves the overall heat energy recovery effect, has a simple structure, and is highly practical.

[0038] In the embodiment of the present invention, it is necessary to adjust the curvature of the flow slowing mechanism 31 according to the setting position of the flow slowing mechanism 31. For example, when the flow slowing mechanism 31 is set in the tortuous part 32, it is necessary to adopt an arc structure, and the flow slowing mechanism 31 and the air outlet channel 542 are interference fit. It is worth mentioning that the air outlet channel 542 adopts a separate structure to facilitate the subsequent installation of the flow slowing mechanism 31.

[0039] The present invention is further configured as follows: the pressure control mechanism includes a control flow channel 5 connected to the purification channel 41 and a control component arranged in the control flow channel 5 and used to control the purification speed of the smoke after entering the purification channel 41; the control flow channel 5 includes a first flow channel 51 and a second flow channel 52 arranged in parallel with each other; the first flow channel 51 is connected to the purification channel 41; the control component includes a first piston 510 movably arranged in the first flow channel 51, a second piston 520 arranged in the second flow channel 52, a connecting rod 53 connecting the rod body part of the first piston 510 and the rod body part of the second piston 520 in sequence, and a pressure control component arranged in the first and second flow channels; the pushing device 43 is connected to the connecting rod 53; by configuring the pressure control mechanism to include a flow channel connected to the purification channel 41 and a control component arranged in the flow channel and used to control the purification speed of the smoke after entering the purification channel 41, the flow The channel includes a first channel 51 and a second channel 52 which are arranged parallel to each other. The first channel 51 is an active chamber, and the second channel 52 is a linkage chamber. The first channel 51 is connected to the purification channel 41. The control component includes a first piston 510 movably arranged in the first channel 51, a second piston 520 arranged in the second channel 52, and a connecting rod 53 which sequentially connects the rod body part of the first piston 510 and the rod body part of the second piston 520. The pushing device 43 is connected to the connecting rod 53, and the first piston 510 and the second piston 520 are connected by the connecting rod 53, so that the three are linked. Moreover, because the first and second channels belong to different chambers, the pressures between the two are not the same. Then, the pressure control component arranged in the first and second channels is used to control the pressure of the pushing device 43 to prevent a strong impact from being formed during startup, which affects the instability of the pushing pressure.

[0040] The present invention is further configured that the pressure control component includes a disk body 54 arranged on the first piston 510 and arranged on one side of the rod cavity, a channel A511 arranged in the rod body part of the first piston 510, a channel B521 that runs through the rod body part of the second piston 520, a channel C531 arranged on the connecting rod 53 and connecting the channel A511 and the channel B521 in sequence, a transverse channel arranged on the disk body 54 and connected to the channel A511, and an air outlet channel 542 arranged on the disk body 54 and perpendicular to the transverse channel, an air outlet 512 is provided on one side of the rod cavity of the first flow channel 51, and the air outlet channel 542 is interconnected with the air outlet 512 through the cooperation between channels A511, B, C, the transverse channel and the air outlet channel 542. Because the first and second pistons are linked to each other, under the pushing action of the pushing device 43, the air pressure in the second flow channel 52 increases instantly, and the movement of the piston is restricted at this moment. At this time, the increased air pressure will pass through channel B521, channel C531, channel A511, the transverse channel and the air outlet channel 542, and then be discharged through the air outlet 512, thereby achieving an overall pressure control effect and reducing the impact of pressure changes on flue gas purification.

[0041] The present invention is further configured such that a plurality of inner mounting cavities 543 are opened on the circumferential side of the disk body 54 and are arranged along the radial direction of the disk body 54. Each inner mounting cavity 543 is arranged in the transverse channel. An inner spring 544 and a slidable pressure block 545 are arranged in the inner mounting cavity 543. The pressure block 545 slides in the axial direction of the disk body 54 under the pulling force of the inner spring 544. With the above-mentioned structural setting and the above-mentioned channel structure, during the exhaust process of the air outlet channel 542, the air flow will enter the inner mounting cavity 543 due to a certain impact, and the air flow will impact the pressure block 545. The pressure block 545 conflicts with the first flow channel 51 to control the output of pressure.

[0042] The present invention is further configured such that an intake check valve 6 is provided on the inner wall of the rodless cavity of the second flow channel 52, and the intake check valve 6 is configured such that when the second piston 520 is away from the intake check valve 6, the air flow is a passage; otherwise, the air flow is cut off. By adopting the above-mentioned structural setting, the intake check valve 6 is provided in the rodless cavity of the second flow channel 52, so that the reset movement of the piston is facilitated, the practicality is improved, the structure is simple, and the stability is strong.

[0043] The present invention is further configured such that the inner diameters of channels A511, B, and C are the same and larger than the inner diameter of the transverse channel. The inner diameter of the transverse channel is larger than the inner diameter of the outlet channel 542. By adopting the above-mentioned structural setting, the inner diameter of the channel is gradually reduced through the above-mentioned channel structure, so as to achieve control of the air pressure, thereby greatly reducing the pressure, ensuring the stable output of the pressure, ensuring the full purification of the flue gas, protecting the atmosphere, and reducing the emission of harmful substances.

[0044] The present invention is further configured such that the air storage chamber 40 includes a left air chamber 401 connected to the air outlet channel 3, a right air chamber 402 connected to the left air chamber 401 on one side and the purification channel 41 on the other side, and an on-off structure arranged on the left and right air chambers 402, the on-off structure including an A plate 403 isolating the left and right air chambers 402, an air vent A404 arranged on the A plate 403, a B plate 405 arranged on the A plate 403 and movably connected to the A plate 403, an air vent B406 arranged on the B plate 405, and a driving cylinder 407 arranged outside the air storage chamber 40 and used to drive the B plate 405 to move and form the air vent A404 and B on-off. Further, by configuring the air storage chamber 40 to include a left air chamber 401 connected to the air outlet channel 3, a right air chamber 402 connected to the left air chamber 401 on one side and the purification channel 41 on the other side, and an on-off structure arranged on the left and right air chambers 402, the on-off structure includes an A plate 403 isolating the left and right air chambers 402, an air vent A404 arranged on the A plate 403, a B plate 405 arranged on the A plate 403 and movably connected to the A plate 403, an air vent B406 arranged on the B plate 405, and a driving cylinder 407 arranged outside the air storage chamber 40 and used to drive the B plate 405 to move and form the air vent A404 and B on-off. The right air chamber 402 and the on-off structure arranged on the left and right air chambers 402 set the air storage chamber 40 into two left and right chambers to form a better control effect, and separate the air storage and purification chambers for operation. The on-off structure is set to include an A plate 403 that isolates the left and right air chambers 402, an air vent A404 arranged on the A plate 403, a B plate 405 arranged on the A plate 403 and movably connected to the A plate 403, an air vent B406 arranged on the B plate 405, and a driving cylinder 407 that is arranged outside the air storage chamber 40 and is used to drive the B plate 405 to move and form the air vents A404 and B on and off. With the above-mentioned structural setting, the on-off of the air vents A404 and B forms mutual communication between the air chambers, ensuring that the two air chambers do not interfere with each other, improving the integrity during purification operations, and having strong stability and simple structure.

[0045] A control method for a flue gas purification and heat recovery device suitable for the above-mentioned heating furnace, further comprising a steam generating chamber connected to a heat exchanger and a steam turbine connected to the steam generating chamber, the steam turbine being electrically connected to a battery, a water level sensor being arranged in the steam generating chamber, a flue gas concentration detector for detecting gas concentration being arranged in the gas storage chamber 40, the water level sensor, the flue gas concentration detector, the driving cylinder 407 and the pushing device 43 being electrically connected to a controller, the controller comprising a water level receiving unit, a flue gas concentration receiving unit, a first start-stop unit for driving the driving cylinder 407 to start and stop, and a second start-stop unit for driving the pushing device 43 to start and stop,

[0046] The control method includes the following steps: S1, the heating furnace works normally, the smoke is discharged along the air outlet 21, enters the air outlet channel 3, and starts to exchange heat with the heat exchanger, the steam generating chamber continuously generates steam at high temperature, drives the steam turbine to generate kinetic energy, and then converts it into electrical energy and stores it in the battery, thus forming energy recovery and utilization;

[0047] S2. When the flue gas passes through the slow flow mechanism 31, the airflow forms a slow swirl in the blade shape of the curved surface guide body 312, thereby prolonging the contact time with the heat exchanger;

[0048] S3, after the flue gas passes through the multiple winding air outlet channels 3, the air flow speed gradually slows down and enters the air storage chamber 40 to be purified;

[0049] S4. When the smoke concentration detector in the gas storage chamber 40 detects that the smoke concentration reaches the K value, the controller drives the B plate 405 to move, so that the vent hole A404 and the vent hole B406 are connected to each other, and the smoke enters the right air chamber 402 from the left air chamber 401 until the right air chamber 402 is in a saturated state. The controller drives the B plate 405 to reset, and the vent hole A404 and the vent hole B406 are not connected;

[0050] S5, the right air chamber 402 and the purification channel 41 form a passage, and the flue gas in the purification channel 41 is purified by the pushing device 43, and the pressure control mechanism controls the flow rate of the flue gas and the pressure to keep the purification speed of the flue gas ≤ P value;

[0051] S6. When the smoke concentration detector detects that the smoke concentration reaches the K value again, steps 4 and 5 are repeated;

[0052] S7, discharging the purified flue gas into the atmosphere, completing flue gas heat recovery and purification;

[0053] S8. The water level sensor detects the change of water level in real time. When there is a lack of water, it will alarm and add water to prevent empty burning.

[0054] By adopting the above technical scheme, beneficial effects are achieved. A heat exchanger is used to perform heat exchange on the flue gas in the outlet channel 542, and the steam generating chamber is used as a medium. The steam drives the steam turbine, and the generated electrical energy is stored in the battery to form a closed loop. The present invention achieves sufficient conversion during heat exchange by buffering the flue gas and controlling the flow rate of the flue gas during purification. Controlling the flow rate during purification is to ensure sufficient purification of the flue gas, reduce pollution to the atmosphere, and improve the environmental protection effect.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for a flue gas purification and heat recovery device of a heating furnace, comprising a furnace body (1), wherein a furnace cavity (2) is provided in the furnace body (1), wherein the furnace cavity (2) is provided with an air inlet (20) and an air outlet (21), wherein: The air outlet (21) is connected to an air outlet channel (3) in a tortuous shape with multiple sections, and the air outlet channel (3) is connected to a heat recovery part and a purification treatment part in sequence, the heat recovery part comprises a heat exchanger wrapped outside the air outlet channel (3) and a slow flow mechanism (31) arranged in the air outlet channel (3), and the purification treatment part comprises an air storage chamber (40) connected to the air outlet channel (3), a purification channel (41) connected to the air storage chamber, a purifier (42) arranged in the purification channel (41), a pushing device (43) arranged in the air storage chamber (40) and used for pushing the smoke into the purification channel (41), and a pressure control mechanism arranged between the purification channel (41) and the pushing device (43); The air storage chamber (40) comprises a left air chamber (401) connected to an air outlet passage (3), a right air chamber (402) connected to the left air chamber (401) on one side and to the purification passage (41) on the other side, and a switching structure arranged on the left and right air chambers (402), the switching structure comprising an A plate (403) for isolating the left and right air chambers (402), an air vent A (404) arranged on the A plate (403), a B plate (405) arranged on the A plate (403) and movably connected to the A plate (403), an air vent B (406) arranged on the B plate (405), and a driving cylinder (407) arranged outside the air storage chamber (40) and used for driving the B plate (405) to move and form the air vents A (404) and B switching. The device also comprises a steam generating chamber connected to the heat exchanger and a steam turbine connected to the steam generating chamber, the steam turbine being electrically connected to a storage battery, a water level sensor being arranged in the steam generating chamber, a smoke concentration detector for detecting gas concentration being arranged in the gas storage chamber (40), the water level sensor, the smoke concentration detector, the driving cylinder (407) and the pushing device (43) being electrically connected to a controller, the controller comprising a water level receiving unit, a smoke concentration receiving unit, a first start-stop unit for driving the driving cylinder (407) to start and stop, and a second start-stop unit for driving the pushing device (43) to start and stop, The control method comprises the following steps: S1, the heating furnace operates normally, smoke is discharged along the air outlet (21), enters the air outlet channel (3), and starts to exchange heat with the heat exchanger, the steam generating chamber continuously generates steam at high temperature, drives the steam turbine to generate kinetic energy, and then converts it into electrical energy and stores it in the battery, thus forming energy recovery and utilization; S2. When the flue gas passes through the slow flow mechanism (31), the airflow forms a slow swirl in the shape of the blades of the curved surface guide body (312), thereby prolonging the contact time with the heat exchanger; S3, after the smoke passes through the multiple winding air outlet channels (3), the air flow speed gradually slows down and enters the air storage chamber (40) to be purified; S4. When the smoke concentration detector in the gas storage chamber (40) detects that the smoke concentration reaches the K value, the controller drives the B plate (405) to move, so that the vent hole A (404) and the vent hole B (406) are connected to each other, and the smoke enters the right air chamber (402) from the left air chamber (401) until the right air chamber (402) is in a saturated state. The controller drives the B plate (405) to reset, and the vent hole A (404) and the vent hole B (406) are disconnected; S5, the right air chamber (402) and the purification channel (41) form a passage, and the flue gas in the purification channel (41) is purified by the pushing device (43), and the pressure control mechanism controls the flow rate of the flue gas and controls the pressure to maintain the purification speed of the flue gas ≤ P value; S6. When the smoke concentration detector detects that the smoke concentration reaches the K value again, steps 4 and 5 are repeated; S7, discharging the purified flue gas into the atmosphere, completing flue gas heat recovery and purification; S8. The water level sensor detects the change of water level in real time. When there is a lack of water, it will alarm and add water to prevent empty burning.

2. The control method of a flue gas purification and heat recovery device of a heating furnace according to claim 1, characterized in that: The slow flow mechanism (31) comprises an inner mounting structure (310) arranged in the air outlet channel (3) and in a cylindrical structure, a main shaft body (311) arranged in the inner mounting structure (310) and closed at both ends, and at least two curved surface guide bodies (312) of spiral structures arranged on the side of the main shaft body (311) and rotating in the same direction and evenly distributed, wherein the spiral center line of the curved surface guide body (312) is arranged along the axis direction of the main shaft body (311), the curved surface guide body (312) guides the direction of smoke flow to form directional movement, and the curved surface guide body (312) guides hot air to form a slow swirl along the shape of blades.

3. The control method of a flue gas purification and heat recovery device of a heating furnace according to claim 2, characterized in that: The slow flow mechanism (31) is located at the inlet of the air outlet channel (3) and / or in the winding part (32) of the air outlet channel (3) body. When the slow flow mechanism (31) is located in the winding part (32), a centrifugal area is formed in the part. The hot air passing through the centrifugal area maintains the speed and direction at the time of entry, forming a centrifugal motion and slowing down the airflow again.

4. The control method of a flue gas purification and heat recovery device of a heating furnace according to claim 1, characterized in that: The pressure control mechanism comprises a control flow channel (5) connected to the purification channel (41) and a control component arranged in the control flow channel (5) and used for controlling the purification speed of the smoke after entering the purification channel (41); the control flow channel (5) comprises a first flow channel (51) and a second flow channel (52) arranged in parallel with each other; the first flow channel (51) is connected to the purification channel (41); the control component comprises a first piston (510) movably arranged in the first flow channel (51); a second piston (520) arranged in the second flow channel (52); a connecting rod (53) connecting the rod body part of the first piston (510) and the rod body part of the second piston (520) in sequence; and a pressure control component arranged in the first and second flow channels; the pushing device (43) is connected to the connecting rod (53).

5. The control method of a flue gas purification and heat recovery device of a heating furnace according to claim 4, characterized in that: The pressure control component comprises a disk body (54) arranged on the first piston (510) and on one side of the rod cavity, a channel A (511) arranged in the rod body portion of the first piston (510), a channel B (521) penetrating the rod body portion of the second piston (520), a channel C (531) arranged on the connecting rod (53) and connecting the channel A (511) and the channel B (521) in sequence, a transverse channel arranged on the disk body (54) and connected to the channel A (511), and an air outlet channel (542) arranged on the disk body (54) and perpendicular to the transverse channel, an air outlet (512) is arranged on one side of the rod cavity of the first flow channel (51), and the air outlet channel (542) is connected to the air outlet (512) with each other.

6. The control method of a flue gas purification and heat recovery device of a heating furnace according to claim 5, characterized in that: A plurality of inner mounting cavities (543) are provided on the circumferential side of the disk body (54) and are arranged along the radial direction of the disk body (54). Each inner mounting cavity (543) is arranged in the transverse channel. An inner spring (544) and a slidable pressure block (545) are arranged in the inner mounting cavity (543). The pressure block (545) slides in the axial direction of the disk body (54) under the pulling force of the inner spring (544).

7. The control method of a flue gas purification and heat recovery device of a heating furnace according to claim 5, characterized in that: An air intake check valve (6) is provided on the inner wall of the rodless cavity of the second flow channel (52). The air intake check valve (6) is configured so that when the second piston (520) is away from the air intake check valve (6), the air flow is open; otherwise, the air flow is closed.

8. The control method of a flue gas purification and heat recovery device of a heating furnace according to claim 5, characterized in that: The inner diameters of the channels A (511), B, and C are all the same and are larger than the inner diameter of the transverse channel, and the inner diameter of the transverse channel is larger than the inner diameter of the air outlet channel (542).

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