Exhaust gas and wastewater waste heat recovery device

Abstract

The application discloses a waste gas and waste water waste heat recovery device, and relates to a supporting facility field of a thermal power plant, which comprises a base and a water pump, a waste water heat exchanger is installed above the outer surface of the base, waste water pipes are connected above the two sides of the waste water heat exchanger, a water inlet pipe is connected to one side of the waste water heat exchanger, and a flue gas heat exchanger is installed on one side of the outer surface of the base. The device comprises a gas collecting hood, a hydraulic cylinder, an electromagnetic valve, a check valve, a piston head, a top rod, a gas pressure sensor, a hydraulic damper and a spring. The hot air blown out by the condenser is sent into an outer shell through the gas collecting hood and the hot air pipe. When the air pressure in the outer shell reaches a certain value, a gas pressure sensor sends an electric signal to a control cabinet to open a hydraulic cylinder. After the hydraulic cylinder is started, the piston head is driven to move to compress the hot air in the outer shell. With the continuous movement of the piston head, the top rod contacts another piston head to drive the other piston head to move, so that the spring and the hydraulic damper are retracted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of supporting facilities of thermal power plants, in particular to a waste gas and waste water waste heat recovery device. BACKGROUND

[0002] The thermal power plant generates heat by burning fuel, and the heat is used to heat water in the boiler to vaporize the water into water vapor, and then the water vapor drives the worm shaft in the generator set to rotate to make the generator work to generate electricity. A large amount of waste flue gas and waste water is generated during power generation in the thermal power plant. In order to avoid waste of resources, the waste heat in the waste water and waste gas is usually preheated by various heat exchangers, so as to reduce the fuel required for heating water in the boiler, thereby achieving energy saving and emission reduction.

[0003] In order to avoid the flue gas pipeline being blocked by smoke dust, the existing waste gas and waste water waste heat recovery device usually uses a soot blower to blow soot in the flue gas pipeline to reduce the possibility of pipeline blockage. However, the airflow blown by the soot blower is relatively large and the temperature is the outdoor normal temperature, which causes the airflow blown into the flue gas pipeline by the soot blower to transfer heat with the flue gas, thereby reducing the overall temperature of the flue gas, which easily affects the heat exchange between the flue gas and the water, and the use is relatively inconvenient. If a hot air blower is used to heat air to blow soot in the flue gas pipeline, the power consumption will greatly increase, which is relatively inconvenient to use. In addition, after the water is preheated by the existing waste gas and waste water waste heat recovery device, part of the water is easily vaporized into steam due to excessive heat absorption, which easily causes the pipeline to contain steam, thereby causing water hammer phenomenon in the pipeline, which intensifies the vibration of the pipeline, thereby affecting the service life of the pipeline, and the use is relatively inconvenient. SUMMARY

[0004] Therefore, the present application aims to provide a waste gas and waste water waste heat recovery device to solve the technical problems of heat loss caused by soot blowing and steam remaining in the water pipe.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a waste gas and waste water waste heat recovery device, comprising a base and a water pump, a waste water heat exchanger is installed above the outer surface of the base, waste water pipes are connected above both sides of the waste water heat exchanger, a water inlet pipe is connected to one side of the waste water heat exchanger, a flue gas heat exchanger is installed on one side of the outer surface of the base, flue gas pipes are connected below one side and above the other side of the flue gas heat exchanger, a condenser is installed below the outer surface of the base, a recovery assembly is arranged on one side of the condenser, and a dust removal assembly is arranged on the outer surface of the base.

[0006] By adopting the technical scheme, the dust removal assembly drives one piston head to move to compress the hot gas in the shell after one hydraulic cylinder is started, the other piston head is driven to move by the contact between the top rod and the other piston head with the continuous movement of one piston head, so that the spring and the hydraulic damper are retracted, the other piston head is moved to end the blocking of the dust removal pipe, so that the compressed hot gas is filled into the flue gas pipe to start the soot blowing work, and the recovery assembly avoids the steam remaining in the water pipe by separating the steam and water through the three-phase separator, thereby avoiding the influence of the steam on the water pipe.

[0007] Further, the dust removal assembly includes four gas collectors connected to the outer surface of the condenser and two shells connected to the outer surface of the base, the outer surface of the four gas collectors is connected with a hot gas pipe, one end of the hot gas pipe is connected with a three-way joint, a solenoid valve is installed between the two shells and the three-way joint, a hydraulic cylinder is installed on one side of each of the two shells, a piston rod is connected to the output end of each of the two hydraulic cylinders, a gas pressure sensor is installed in the interior of each of the two shells, a hydraulic damper is connected to one side in the interior of each of the two shells, a spring is arranged on the outer surface of each of the two hydraulic dampers, a piston head is connected to one end of each of the two hydraulic dampers and one end of each of the two piston rods, a top rod is connected to one side of each of the two piston heads, a dust removal pipe is connected to the top of one shell and the bottom of the other shell, and a one-way valve is installed between each of the two dust removal pipes and the flue gas pipe.

[0008] By adopting the technical scheme, one piston head is driven to move to compress the hot gas in the shell after one hydraulic cylinder is started, the other piston head is driven to move by the contact between the top rod and the other piston head with the continuous movement of one piston head, so that the spring and the hydraulic damper are retracted, the spring is arranged to facilitate the subsequent driving of the other piston head to reset, and the hydraulic damper is arranged to avoid the random sliding of the other piston head, the other piston head is moved to end the blocking of the dust removal pipe, so that the compressed hot gas is filled into the flue gas pipe to start the soot blowing work.

[0009] Further, the recovery assembly includes a water pump located on one side of the condenser, a water delivery pipe is connected to the water outlet of the water pump, a three-phase separator is connected to the bottom of the flue gas heat exchanger and below the other side of the waste water heat exchanger, a water outlet pipe is connected to the bottom of one three-phase separator, a gas delivery pipe is connected to the outer surface of each of the two three-phase separators, and an air inlet pipe is connected to the bottom of the gas delivery pipe.

[0010] By adopting the technical scheme, the steam and water are separated by the three-phase separator, so that the steam is prevented from remaining in the water pipe and affecting the water pipe, then the steam is sent into the condenser through the gas delivery pipe to be condensed into water together with the steam generated by the boiler, and then the condensed water is sent into the water inlet pipe through the water pump and the water delivery pipe to be preheated again.

[0011] Further, the outer surface of the base is provided with a control cabinet on the other side, and the control cabinet is electrically connected with the condenser, the hydraulic cylinder, the electromagnetic valve, the air pressure sensor and the water pump respectively.

[0012] By adopting the above technical scheme, the worker selects to turn on or turn off the condenser, the hydraulic cylinder, the electromagnetic valve, the air pressure sensor and the water pump through the control cabinet. After the water pump is started, the water pump cooperates with the water conveying pipe to send the condensed water into the water inlet pipe to reheat the water.

[0013] Further, the piston head is slidingly connected with the shell, and the four piston heads are mirror image distributed.

[0014] By adopting the above technical scheme, after one hydraulic cylinder is started, one piston head is driven to move to compress the hot gas in the shell. With the continuous movement of one piston head, the top rod is in contact with the other piston head to drive the other piston head to move, so that the spring and the hydraulic damper are retracted. Through the arrangement of the spring, the subsequent driving of the other piston head is facilitated. At the same time, through the arrangement of the hydraulic damper, the random sliding of the other piston head is avoided. After the movement of the other piston head, the plugging of the dust removal pipe is ended, so that the compressed hot gas is filled into the flue gas pipe to start the soot blowing work.

[0015] Further, the gas conveying pipe is fixedly connected with the gas inlet end of the two three-phase separators and the condenser respectively, and one end of the water conveying pipe is fixedly connected with the water inlet pipe.

[0016] By adopting the above technical scheme, through the arrangement of the three-phase separator, the steam and water are branched off, so as to avoid the steam remaining in the water pipe and avoid the influence of the steam on the water pipe. Then, through the gas conveying pipe, the steam is sent into the condenser to be condensed into water together with the steam generated by the boiler. Then, through the cooperation of the water pump and the water conveying pipe, the condensed water is sent into the water inlet pipe to reheat the water.

[0017] Further, the two one-way valves are staggered, and the two shells and the dust removal pipe are mirror image distributed.

[0018] By adopting the above technical scheme, when the air pressure in the other shell reaches a certain value, the other shell is inflated into the flue gas pipe. At the same time, the air inlet of one shell starts to work. The two shells work in a cycle and alternately inflate the flue gas pipe.

[0019] Further, the four gas collecting covers are equidistantly distributed, and the four gas collecting covers are welded with the condenser.

[0020] By adopting the above technical scheme, through the gas collecting cover and the hot gas pipe, the hot air blown out of the condenser is sent into the three-way joint. Then, the hot air enters one shell through one electromagnetic valve. When the air pressure in one shell reaches a certain value, one air pressure sensor sends an electric signal to the control cabinet to start one hydraulic cylinder and the other electromagnetic valve.

[0021] In summary, the present application mainly has the following beneficial effects:

[0022] 1、The present application through the gas hood, hydraulic cylinder, solenoid valve, check valve, piston head, ejector rod, air pressure sensor, hydraulic damper and spring, through the gas hood and hot gas pipe, the hot air blown out by the condenser is sent into a shell, when the air pressure in the shell reaches a certain value, a air pressure sensor sends an electric signal to the control cabinet to open a hydraulic cylinder, after the hydraulic cylinder is started, a piston head is driven to move to compress the hot air in the shell, with the continuous movement of the piston head, the ejector rod contacts another piston head to drive another piston head to move, so that the spring and the hydraulic damper are retracted, the setting of the spring facilitates the subsequent driving of another piston head to reset, and at the same time, the setting of the hydraulic damper avoids the random sliding of another piston head, after another piston head moves, the plugging of the dust removal pipe is ended, so that the compressed hot air is filled into the flue gas pipe to start the soot blowing work, and at the same time, the setting of the check valve avoids the flue gas from entering the shell, the temperature of the hot air blown out by the condenser is high, so the influence on the flue gas temperature is reduced, when the air pressure in another shell reaches a certain value, the above steps are repeated to fill air into the flue gas pipe, at the same time, the air in the shell starts to enter, the two shells work in a cycle and alternately fill air into the flue gas pipe to blow dust, which facilitates the cleaning of the flue gas pipeline and reduces the influence on the flue gas temperature, thereby reducing heat loss, and the power is relatively low, so it will not consume too much electricity.

[0023] 2、The present application through the three-phase separator, gas pipe, water pump and water pipe, through the setting of the three-phase separator, the steam and water are separated, so as to avoid the steam remaining in the water pipe, avoiding the influence of steam on the water pipe, then through the gas pipe, the steam is sent into the condenser to condense into water together with the steam generated by the boiler, then through the water pump and the water pipe, the condensed water is sent into the water inlet pipe to be preheated again, effectively reducing the steam in the water pipe to avoid the influence of steam on the water pipe. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a sectional structure diagram of the base of the present application;

[0025] Figure 2 It is a sectional structure diagram of the shell of the present application;

[0026] Figure 3 It is a sectional structure diagram of the shell of the present application; Figure 1 It is an enlarged view of structure A in the present application;

[0027] Figure 4 It is a structure diagram of the shell of the present application;

[0028] Figure 5 It is a structure diagram of the piston head of the present application.

[0029] In the diagram: 1. Base; 2. Wastewater heat exchanger; 3. Flue gas heat exchanger; 4. Condenser; 5. Dust removal assembly; 501. Gas collection hood; 502. Hot gas pipe; 503. Outer shell; 504. Hydraulic cylinder; 505. Solenoid valve; 506. Dust removal pipe; 507. One-way valve; 508. Piston head; 509. Push rod; 510. Air pressure sensor; 511. Hydraulic damper; 512. Spring; 513. T-joint; 6. Recovery assembly; 601. Three-phase separator; 602. Gas supply pipe; 603. Water pump; 604. Water supply pipe; 7. Wastewater pipe; 8. Water inlet pipe; 9. Control cabinet; 10. Flue gas pipe; 11. Water outlet pipe; 12. Air inlet pipe. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] The embodiments of the present invention will now be described.

[0032] A waste gas and wastewater waste heat recovery device, such as Figure 1 , 2 As shown in Figure 3, the system includes a base 1 and a water pump 603. A wastewater heat exchanger 2 is installed on the upper surface of the outer surface of the base 1. Wastewater pipes 7 are connected to the upper sides of both sides of the wastewater heat exchanger 2. An inlet pipe 8 is connected to one side of the wastewater heat exchanger 2. A flue gas heat exchanger 3 is installed on one side of the outer surface of the base 1. Flue gas pipes 10 are connected to the lower side of one side and the upper side of the other side of the flue gas heat exchanger 3. A condenser 4 is installed on the lower side of the outer surface of the base 1. A recovery component 6 is provided on one side of the condenser 4 to effectively reduce steam in the water pipes and thus avoid steam affecting the water pipes. The outer surface of the base 1 is equipped with a dust removal component 5, which facilitates the cleaning of dust in the flue gas duct and reduces the impact on the flue gas temperature, thereby reducing heat loss. It also has low power consumption and will not consume too much electricity. On the other side of the outer surface of the base 1, a control cabinet 9 is installed. The control cabinet 9 is electrically connected to the condenser 4, hydraulic cylinder 504, solenoid valve 505, air pressure sensor 510 and water pump 603 respectively. The operator can turn the condenser 4, hydraulic cylinder 504, solenoid valve 505, air pressure sensor 510 and water pump 603 on or off through the control panel.

[0033] See Figure 1 , 2, 3, 4 and 5, the dust removal assembly 5 comprises four gas collectors 501 connected to the outer surface of the condenser 4, two housings 503 connected to the outer surface of the base 1, the outer surface of the four gas collectors 501 is connected with hot gas pipes 502, one end of the hot gas pipes 502 is connected with a three-way joint 513, an electromagnetic valve 505 is installed between the two housings 503 and the three-way joint 513, a hydraulic cylinder 504 is installed on one side of each of the two housings 503, a piston rod is connected to the output end of each of the two hydraulic cylinders 504, a gas pressure sensor 510 is installed in each of the two housings 503, a hydraulic damper 511 is connected to one side in each of the two housings 503, a spring 512 is arranged on the outer surface of each of the two hydraulic dampers 511, a piston head 508 is connected to one end of each of the two hydraulic dampers 511 and the two piston rods, a top rod 509 is connected to one side of each of the two piston heads 508, a dust removal pipe 506 is connected to the top of one of the two housings 503 and the bottom of the other housing 503, a one-way valve 507 is installed between each of the two dust removal pipes 506 and the flue gas pipe 10, the piston head 508 is in sliding connection with the housing 503, and the four piston heads 508 are mirror image distributed, the two one-way valves 507 are staggered distributed, and the two housings 503 and the dust removal pipes 506 are mirror image distributed, the four gas collectors 501 are equidistantly distributed, and the four gas collectors 501 are welded with the condenser 4, which facilitates cleaning of the flue gas pipeline and reduces the impact on the flue gas temperature, thereby reducing heat loss, and the lower power consumption does not consume too much electricity.

[0034] Referring to Figure 1 The recovery assembly 6 comprises a water pump 603 located on one side of the condenser 4, the water outlet end of the water pump 603 is connected with a water delivery pipe 604, a three-phase separator 601 is connected to the bottom of the other side of the waste water heat exchanger 2 and the bottom of the flue gas heat exchanger 3, the bottom of one three-phase separator 601 is connected with a water outlet pipe 11, the outer surface of each of the two three-phase separators 601 is connected with a gas delivery pipe 602, the bottom of the gas delivery pipe 602 is connected with a gas inlet pipe 12, the gas delivery pipe 602 is fixedly connected with the two three-phase separators 601 and the gas inlet end of the condenser 4, and one end of the water delivery pipe 604 is fixedly connected with a water inlet pipe, which effectively reduces the steam in the water pipe and avoids the impact of steam on the water pipe.

[0035] The implementation principle of the embodiment is that: first, the wastewater enters the wastewater heat exchanger 2 through the wastewater pipe 7, and the clean water enters the wastewater heat exchanger 2 through the water inlet pipe 8, the wastewater and the clean water are heat exchanged through the wastewater heat exchanger 2 to preheat the clean water for the first time, the first preheated water enters the flue gas heat exchanger 3 to be heat exchanged with the flue gas for the second time, then the preheated water is sent into the boiler through the water outlet pipe 11, the steam and the water are branched off through the setting of the three-phase separator 601 to avoid the steam remaining in the water pipe and affecting the water pipe, then the steam is sent into the condenser 4 through the gas conveying pipe 602, the residual steam after power generation is sent into the condenser 4 through the gas inlet pipe 12 and the gas conveying pipe 602 to be condensed into water together with the branched steam, then the condensed water is sent into the water inlet pipe 8 through the water pump 603 and the water conveying pipe 604 to preheat the water again, the hot air blown out of the condenser 4 is sent into the three-way joint 513 through the gas collecting hood 501 and the hot air pipe 502, then the hot air enters one of the housings 503 through one of the electromagnetic valves 505, when the air pressure in one of the housings 503 reaches a certain value, one of the air pressure sensors 510 sends an electric signal to the control cabinet 9 to open one of the hydraulic cylinders 504 and the other of the electromagnetic valves 505, after the other of the electromagnetic valves 505 is started, the hot air enters the other of the housings 503, and one of the electromagnetic valves 505 is closed to avoid the hot air entering one of the housings 503, the output end of one of the hydraulic cylinders 504 drives a piston head 508 to move by a piston rod after the piston head 508 moves to compress the hot air in the housing 503, as one of the piston heads 508 continuously moves, a top rod 509 contacts the other of the piston heads 508 to drive the other of the piston heads 508 to move, so that the spring 512 and the hydraulic damper 511 are contracted, the spring 512 is provided to facilitate subsequent driving of the other of the piston heads 508 to reset, and the hydraulic damper 511 is provided to avoid the other of the piston heads 508 from sliding randomly, after the other of the piston heads 508 moves, the sealing of the dust removal pipe 506 is ended, so that the compressed hot air fills the flue gas pipe 10 to start the soot blowing work, and the setting of the one-way valve 507 avoids the flue gas entering the housing 503, the temperature of the hot air blown out of the condenser 4 is high, so the influence on the flue gas temperature is reduced, when the air pressure in the other of the housings 503 reaches a certain value, the other of the housings 503 is filled with air through the above steps, and one of the housings 503 starts to intake air, the two housings 503 work in a cycle and alternately fill the flue gas pipe 10 with air to blow dust.

[0036] Although the embodiments of the present application have been shown and described, the specific embodiments are merely exemplary and are not to be construed as limiting the present application, and the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner, and those skilled in the art can make modifications, replacements and variations to the embodiments without creative contribution after reading the specification, and as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A waste gas and waste water heat recovery device, comprising a base (1) and a water pump (603), characterized in that: The outer surface of the base (1) is provided with a waste water heat exchanger (2), the two sides of the waste water heat exchanger (2) are provided with waste water pipes (7), one side of the waste water heat exchanger (2) is provided with a water inlet pipe (8), one side of the outer surface of the base (1) is provided with a flue gas heat exchanger (3), one side of the flue gas heat exchanger (3) is provided with a flue gas pipe (10), the bottom of the outer surface of the base (1) is provided with a condenser (4), one side of the condenser (4) is provided with a recovery assembly (6), the recovery assembly (6) comprises a water pump (603) arranged on one side of the condenser (4), the water outlet end of the water pump (603) is connected with a water delivery pipe (604), the other side of the waste water heat exchanger (2) and the bottom of the flue gas heat exchanger (3) are provided with three-phase separators (601), the bottom of one three-phase separator (601) is connected with a water outlet pipe (11), the outer surfaces of the two three-phase separators (601) are connected with gas delivery pipes (602), the bottom of the gas delivery pipe (602) is connected with an air inlet pipe (12), the outer surface of the base (1) is provided with a dust removal assembly (5), the dust removal assembly (5) comprises four gas collecting covers (501) connected to the outer surface of the condenser (4) and two housings (503) connected to the outer surface of the base (1), the four gas collecting covers (501) are equidistantly distributed, and the four gas collecting covers (501) are welded to the condenser (4), the outer surfaces of the four gas collecting covers (501) are connected with hot gas pipes (502), one end of the hot gas pipe (502) is connected with a three-way joint (513), an electromagnetic valve (505) is arranged between the two housings (503) and the three-way joint (513), one side of each of the two housings (503) is provided with a hydraulic cylinder (504), the output ends of the two hydraulic cylinders (504) are connected with piston rods, gas pressure sensors (510) are arranged in the interiors of the two housings (503), the other side of the outer surface of the base (1) is provided with a control cabinet (9), and the control cabinet (9) is electrically connected with the condenser (4), the hydraulic cylinders (504), the electromagnetic valve (505), the gas pressure sensors (510) and the water pump (603), respectively, one side of the interior of each of the two housings (503) is connected with a hydraulic damper (511), the outer surfaces of the two hydraulic dampers (511) are provided with springs (512), one end of each of the two hydraulic dampers (511) and one end of each of the two piston rods are connected with piston heads (508), the piston heads (508) are slidably connected with the housings (503), and the four piston heads (508) are mirror-imaged distributed, one side of each of the two piston heads (508) is connected with a top rod (509), the top of one of the two housings (503) and the bottom of the other of the two housings (503) are connected with dust removal pipes (506), the two housings (503) and the dust removal pipes (506) are mirror-imaged distributed, and a one-way valve (507) is arranged between each of the two dust removal pipes (506) and the flue gas pipe (10).The two one-way valves (507) are staggered.

2. The waste gas and waste water heat recovery device according to claim 1, characterized in that: The gas delivery pipe (602) is fixedly connected with the two three-phase separators (601) and the gas inlet end of the condenser (4) respectively, and one end of the water delivery pipe (604) is fixedly connected with the water inlet pipe.

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