Power plant flue gas water heat recovery and flue gas white smoke elimination device

Abstract

The utility model discloses a flue gas water heat recovery and flue gas white smoke elimination device for a power plant. A centrifugal fan communicates with outside air; the flue gas heater is provided with a flue gas inlet and a flue gas outlet, and the flue gas inlet is communicated with the centrifugal fan; the steam generator is provided with a steam outlet, and the steam outlet is communicated with the flue gas outlet of the flue gas heater through the mixer; the heat exchanger is provided with a gas inlet, a gas outlet, a water inlet, a water outlet and a liquid outlet; the gas inlet is respectively communicated with the flue gas outlet and the steam outlet through the mixer; the circulating water tank is respectively communicated with the water inlet and the water outlet; and the condensation water tank is communicated with the liquid outlet. According to the device, the centrifugal fan and the flue gas heater simulate a power plant to provide high-temperature flue gas, the high-temperature flue gas is humidified through the steam generator and the mixer to form saturated wet flue gas, the saturated wet flue gas is subjected to heat exchange through the heat exchanger, and the saturated wet flue gas is dehumidified and cooled through cooling water, so that water in the flue gas is recycled; meanwhile, white smoke plume is eliminated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power plant plume management, in particular to a power plant flue gas water heat recovery and flue gas white elimination device. BACKGROUND

[0002] At present, the flue gas discharged by the coal-fired power plant using lignite as fuel is in water vapor saturation state, and the water discharge amount is huge, causing a large amount of latent heat waste. Utilizing the boiler exhaust flue gas waste heat is one of the important ways for energy saving and emission reduction of thermal power generating units. Although many power plants have been reformed for waste heat utilization, most of them only reduce the exhaust flue gas temperature to about 100℃. The flue gas waste heat of the power plant boiler is composed of sensible heat and latent heat, and the latent heat carried by the water in the flue gas accounts for about 30% of the total heat. In order to avoid low-temperature corrosion, most of the boilers only recover the sensible heat of the flue gas and give up the latent heat of the flue gas, and at the same time, the water in the flue gas is also lost. For the regions with lack of water resources, the demand for water saving and consumption reduction is urgent.

[0003] White plume refers to the flue gas group continuously discharged from the chimney, which is named because of its feather-shaped appearance, and is also called wet plume in the industry. The white smoke discharged from the chimney is mixed with the ambient cold air, and in the process of temperature reduction, the water vapor contained is saturated and condensed, and the condensed water mist droplets refract and scatter the light, making the plume appear white or gray. White elimination refers to the action of eliminating white plume, which is an indispensable work for the production environment management of power plants, and the purpose is to reduce the water vapor saturation degree of the relative air of the finally discharged flue gas, and avoid the water vapor in the flue gas from being supersaturated and condensed into small droplets to form white plume. The large amount of low-temperature wet flue gas discharged into the atmosphere by the coal-fired device causes the increase of the humidity of the regional atmospheric environment, which creates the humidity condition for the formation of regional haze. The existing research shows that the water in the large amount of low-temperature wet flue gas discharged into the atmosphere causes the increase of the humidity of the low-altitude air. The low-temperature wet flue gas discharged by the coal-fired power plant located in a depression is not easy to diffuse; it is beneficial to the growth of hygroscopic aerosols and the formation of haze.

[0004] Therefore, the way of collecting the droplets in the flue gas of the power plant and the water in the saturated water vapor, reducing the emission of soluble salts and condensable particulate matters, eliminating white plume, and saving water and reducing consumption has become a problem to be solved at present. CONTENT OF THE INVENTION

[0005] The main purpose of the present application is to provide a power plant flue gas water heat recovery and flue gas white elimination device, which aims to solve the problems of large waste of latent heat of vaporization of the flue gas of the power plant and pollution of the environment caused by the white plume generated.

[0006] To achieve the above object, the application provides a power plant flue gas water heat recovery and flue gas white elimination device, which comprises a centrifugal fan, a flue gas heater, a steam generator, a heat exchanger, a circulating water tank, a condensate tank and an exhaust cylinder; wherein the centrifugal fan is in communication with external air; the flue gas heater has a flue gas inlet and a flue gas outlet, and the flue gas inlet is in communication with the centrifugal fan; the steam generator has a steam outlet, which is in communication with the flue gas outlet of the flue gas heater through a mixer; the heat exchanger has a gas inlet, a gas outlet, a water inlet, a water outlet and a liquid outlet, and the gas inlet is in communication with the flue gas outlet and the steam outlet through the mixer; the circulating water tank is in communication with the water inlet and the water outlet; the condensate tank is in communication with the liquid outlet; the exhaust cylinder is in communication with the gas outlet, and the exhaust cylinder is in communication with the outside.

[0007] Optionally, the device further comprises a first flue gas pipeline, a second flue gas pipeline, a third flue gas pipeline and a fourth flue gas pipeline; wherein the first flue gas pipeline is in communication with the centrifugal fan and the flue gas inlet; one end of the second flue gas pipeline is in communication with the first flue gas pipeline, and the other end is in communication with the outside, and a first valve is arranged on the second flue gas pipeline; the mixer is arranged on the third flue gas pipeline, and the third flue gas pipeline is in communication with the flue gas outlet and the gas inlet through the mixer; the fourth flue gas pipeline is in communication with the steam outlet and the mixer, and a second valve is arranged on the fourth flue gas pipeline.

[0008] Optionally, the device further comprises a first flow sensor, a first temperature sensor and a humidity sensor; wherein the first flow sensor is arranged on the third flue gas pipeline and located between the mixer and the flue gas heater; the first temperature sensor is arranged on the third flue gas pipeline and located between the mixer and the gas inlet; the humidity sensor is arranged on the third flue gas pipeline and located between the mixer and the gas inlet.

[0009] Optionally, the device further comprises a first liquid pipeline, a second liquid pipeline, a third liquid pipeline and a fourth liquid pipeline; wherein the first liquid pipeline is in communication with the circulating water tank and the water inlet, and a circulating water pump is arranged on the first liquid pipeline; one end of the second liquid pipeline is in communication with the circulating water tank, and the other end is in communication with the first liquid pipeline at a position between the circulating water pump and the water inlet, and a third valve is arranged on the second liquid pipeline; the third liquid pipeline is in communication with the condensate tank and the liquid outlet; the fourth liquid pipeline is in communication with the water outlet and the circulating water tank.

[0010] Optionally, the device further comprises a second flow sensor, a second temperature sensor and a third temperature sensor; wherein the second flow sensor is arranged on the first liquid pipeline and located between the water inlet and the communication position of the first liquid pipeline and the second liquid pipeline; the second temperature sensor is arranged on the first liquid pipeline and located between the mixer and the gas inlet; and the third temperature sensor is arranged on the fourth liquid pipeline.

[0011] Optionally, the gas outlet is communicated with the exhaust cylinder through a fifth flue gas pipeline.

[0012] Optionally, the device further comprises a fourth temperature sensor arranged on the fifth flue gas pipeline.

[0013] Optionally, the material of the exhaust cylinder is stainless steel.

[0014] Optionally, the heat exchanger is a shell-and-tube heat exchanger.

[0015] Optionally, the device further comprises an operation platform and a power supply; wherein the operation platform is electrically connected with each component of the device; and the power supply is electrically connected with the operation platform and each component of the device.

[0016] This application provides a power plant flue gas hydrothermal recovery and flue gas whitening device, which connects to the outside air via a centrifugal fan to provide air to simulate the flue gas generated by the power plant; the flue gas heater has a flue gas inlet and a flue gas outlet, and the flue gas inlet is connected to the centrifugal fan, which heats the air provided by the centrifugal fan; the steam generator has a steam outlet, which is connected to the flue gas outlet of the flue gas heater via a mixer, where the steam generated by the steam generator mixes with the air heated by the flue gas heater to form high-temperature saturated wet flue gas; the heat exchanger has a gas inlet, a gas outlet, and a water inlet. The system includes a water outlet and a liquid discharge outlet. The gas inlet is connected to the flue gas outlet and steam outlet respectively through a mixer. High-temperature saturated wet flue gas enters the heat exchanger through the gas inlet from the mixer for heat exchange. The circulating water tank is connected to the water inlet and outlet respectively, and provides circulating cooling water to the heat exchanger. The condensate tank is connected to the liquid discharge outlet. The high-temperature saturated wet flue gas is cooled in the heat exchanger to form condensate, which flows into the condensate tank through the liquid discharge outlet. The exhaust stack is connected to the gas outlet and is also connected to the outside. After heat exchange in the heat exchanger, the high-temperature saturated wet flue gas completes the flue gas whitening process. The whitened flue gas is discharged to the outside through the exhaust stack. With the above setup, the device can simulate the high-temperature flue gas provided by a power plant using a centrifugal fan and flue gas heater, replacing the high-temperature flue gas with ambient air, thus avoiding the impact of pollutants. The high-temperature flue gas is humidified by a steam generator and a mixer to form high-temperature saturated wet flue gas. The high-temperature saturated wet flue gas undergoes heat exchange through a heat exchanger, and cooling water is used as a cold source to dehumidify and cool the high-temperature saturated wet flue gas, thereby achieving the recovery and reuse of moisture in the flue gas and eliminating white plumes. Attached Figure Description

[0017] Figure 1 A schematic diagram of the power plant flue gas hydrothermal recovery and flue gas whitening device provided in the embodiments of this application;

[0018] Figure 2 This is a schematic diagram of the heat exchanger in an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the structure of the operating console in the embodiments of this application.

[0020] 101, centrifugal fan; 102, flue gas heater; 1021, flue gas inlet; 1022, flue gas inlet; 103, 104, mixer; steam generator; 1031, steam outlet; 201, heat exchanger; 2011, gas inlet; 2012, gas outlet; 2013, water inlet; 2014, water outlet; 2015, liquid outlet; 202, circulating water tank; 203, condensate tank; 301, exhaust pipe; 11, first flue gas pipe; 12, second flue gas pipe; 121, first valve; 13, third flue gas pipe; 14, fourth flue gas pipe; 141, second valve; 131, first flow sensor; 132, first temperature sensor; 133, humidity sensor; 21, first liquid pipe; 22, second liquid pipe; 221, third valve; 23, third liquid pipe; 24, fourth liquid pipe; 211, second flow sensor; 212, second temperature sensor; 241, third temperature sensor; 31, fifth flue gas pipe; 311, fourth temperature sensor; 401, temperature control module; 402, valve control module; 403, data display module. Mixer

[0021] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0024] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, 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 limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment 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, and is not within the protection scope required by the present application.

[0026] The present application will be described in detail below in conjunction with the drawings and embodiments.

[0027] Figure 1 The structure schematic diagram of the power plant flue gas water heat recovery and flue gas white elimination device provided by the embodiments of the present application is shown in the figure, Figure 2 The structure schematic diagram of the heat exchanger in the embodiments of the present application is shown in the figure, Figure 3 The structure schematic diagram of the operation table in the embodiments of the present application is shown in the figure.

[0028] Please refer to Figure 1 and Figure 2 , the present application provides a power plant flue gas water heat recovery and flue gas white elimination device, which can include: centrifugal fan 101, flue gas heater 102, steam generator 103, heat exchanger 201, circulating water tank 202, condensate tank 203 and exhaust cylinder 301; wherein the centrifugal fan 101 is in communication with the outside air; the flue gas heater 102 has a flue gas inlet 1021 and a flue gas outlet 1022, and the flue gas inlet 1021 is in communication with the centrifugal fan 101; the steam generator 103 has a steam outlet 1031, and the steam outlet 1031 is in communication with the flue gas outlet 1022 of the flue gas heater 102 through the mixer 104; the heat exchanger 201 has a gas inlet 2011, a gas outlet 2012, a water inlet 2013, a water outlet 2014 and a liquid outlet 2015, and the gas inlet 2011 is in communication with the flue gas outlet 1022 and the steam outlet 1031 through the mixer 104 respectively; the circulating water tank 202 is in communication with the water inlet 2013 and the water outlet 2014 respectively; the condensate tank 203 is in communication with the liquid outlet 2015; the exhaust cylinder 301 is in communication with the gas outlet 2012, and the exhaust cylinder 301 is in communication with the outside.

[0029] Specifically, the embodiment of the present application can use ambient air instead of power plant flue gas, ambient air is introduced into the device by centrifugal fan 101, the air enters flue gas heater 102 through flue gas inlet 1021 to be heated, the heated air enters mixer 104 through flue gas outlet 1022, steam generated by steam generator 103 enters mixer 104 through steam outlet 1031 to be fully mixed with the heated air to form high-temperature saturated wet flue gas; the high-temperature saturated wet flue gas enters heat exchanger 201 through gas inlet 2011 to be heat exchanged, cooling water in circulating water tank 202 is used as a cold source to enter heat exchanger 201 through water inlet 2013 to cool and dehumidify the high-temperature saturated wet flue gas, the water in the flue gas condenses to form condensed water after the high-temperature saturated wet flue gas is cooled, the condensed water enters condensate tank 203 through liquid outlet 2015, the condensed water can be supplemented to a desulfurization tower or a cooling tower, thereby achieving water saving and consumption reduction, the cooling water after heat exchange flows back to circulating water tank 202 from heat exchanger 201 through water outlet 2014 to realize cooling water circulation; the high-temperature saturated wet flue gas after cooling and dehumidification treatment realizes flue gas white elimination, and is discharged to the outside through exhaust pipe 301 through gas outlet 2012.

[0030] The power plant flue gas hydrothermal recovery and flue gas white elimination device provided by the embodiment of the application is characterized in that: the centrifugal fan 101 is in communication with the outside air to provide air for the device to simulate the flue gas generated by the power plant; the flue gas heater 102 has a flue gas inlet 1021 and a flue gas outlet 1022, the flue gas inlet 1021 is in communication with the centrifugal fan 101, and the flue gas heater 102 heats the air provided by the centrifugal fan 101; the steam generator 103 has a steam outlet 1031, the steam outlet 1031 is in communication with the flue gas outlet 1022 of the flue gas heater 102 through the mixer 104, and the steam generated by the steam generator 103 and the air heated by the flue gas heater 102 are fully mixed in the mixer 104 to form high-temperature saturated wet flue gas; the heat exchanger 201 has a gas inlet 2011, a gas outlet 2012, a water inlet 2013, a water outlet 2014 and a liquid outlet 2015, the gas inlet 2011 is in communication with the flue gas outlet 1022 and the steam outlet 1031 through the mixer 104, and the high-temperature saturated wet flue gas enters the heat exchanger 201 through the gas inlet 2011 to exchange heat; the circulating water tank 202 is in communication with the water inlet 2013 and the water outlet 2014, and the circulating water tank 202 provides circulating cooling water for the heat exchanger 201; the condensate tank 203 is in communication with the liquid outlet 2015, the high-temperature saturated wet flue gas is cooled in the heat exchanger 201 to form condensate, and the condensate flows into the condensate tank through the liquid outlet 2015; the exhaust cylinder 301 is in communication with the gas outlet 2012, and the exhaust cylinder 301 is in communication with the outside, the high-temperature saturated wet flue gas is heat-exchanged in the heat exchanger to complete flue gas white elimination, and the white-eliminated flue gas is discharged to the outside through the exhaust cylinder. Through the above arrangement, the device can simulate the high-temperature flue gas provided by the power plant through the centrifugal fan 101 and the flue gas heater 102, use the ambient air to replace the high-temperature flue gas, not involve the influence of pollutants, humidify the high-temperature flue gas through the steam generator 103 and the mixer 104 to form high-temperature saturated wet flue gas, heat-exchange the high-temperature saturated wet flue gas through the heat exchanger 201, and cool the high-temperature saturated wet flue gas by taking the cooling water as a cold source to reduce the humidity and temperature, so as to realize the recycling of the water in the flue gas and eliminate the white smoke.

[0031] In the example embodiment, the device can further include a first flue gas pipe 11, a second flue gas pipe 12, a third flue gas pipe 13 and a fourth flue gas pipe 14.

[0032] The first flue gas pipeline 11 is communicated with the centrifugal fan 101 and the flue gas inlet 1021; one end of the second flue gas pipeline 12 is communicated with the first flue gas pipeline 11 and the other end is communicated with the outside, and the first valve 121 is arranged on the second flue gas pipeline 12; the mixer 104 is arranged on the third flue gas pipeline 13, and the third flue gas pipeline 13 is communicated with the flue gas outlet 1022 and the gas inlet 2011 through the mixer 104; the fourth flue gas pipeline 14 is communicated with the steam outlet 1031 and the mixer 104, and the second valve 141 is arranged on the fourth flue gas pipeline 14.

[0033] Specifically, the ambient air can be drawn into the flue gas heater 102 through the first flue gas pipeline 11 and the flue gas inlet 1021 by the centrifugal fan 101; the first valve 121 is arranged on the second flue gas pipeline 12, and the flow rate of the first flue gas pipeline 11 can be adjusted by controlling the opening of the first valve 121; the high-temperature flue gas formed by heating the air in the second flue gas pipeline 12 is mixed with the steam entering the mixer 104 through the fourth flue gas pipeline 14 to form saturated wet flue gas; the second valve 141 is arranged on the fourth flue gas pipeline 14 to control the flow rate of the steam.

[0034] In the example embodiment, the device can further include a first flow sensor 131, a first temperature sensor 132 and a humidity sensor 133.

[0035] The first flow sensor 131 is arranged on the third flue gas pipeline 13 and located between the mixer 104 and the flue gas heater 102; the first temperature sensor 132 is arranged on the third flue gas pipeline 13 and located between the mixer 104 and the gas inlet 2011; and the humidity sensor 133 is arranged on the third flue gas pipeline 13 and located between the mixer 104 and the gas inlet 2011.

[0036] Specifically, the first flow sensor 131 is used to measure the flow rate of the flue gas in the third flue gas pipeline 13 and transmit the data to the operation platform in real time; the first temperature sensor 132 is used to measure the temperature of the high-temperature saturated wet flue gas at the gas inlet 2011 of the heat exchanger 201 and transmit the data to the operation platform in real time; and the humidity sensor 133 is used to measure the humidity of the high-temperature saturated wet flue gas at the gas inlet 2011 of the heat exchanger 201 and transmit the data to the operation platform in real time.

[0037] In the example embodiment, the device can further include a first liquid pipeline 21, a second liquid pipeline 22, a third liquid pipeline 23 and a fourth liquid pipeline 24.

[0038] The first liquid pipeline 21 is communicated with the circulating water tank 202 and the water inlet 2013, and the circulating water pump 204 is arranged on the first liquid pipeline 21; one end of the second liquid pipeline 22 is communicated with the circulating water tank 202, and the other end is communicated with the first liquid pipeline 21 at a position between the circulating water pump 204 and the water inlet 2013, and the third valve 221 is arranged on the second liquid pipeline 22; the third liquid pipeline 23 is communicated with the condensate tank 203 and the liquid outlet 2015; and the fourth liquid pipeline 24 is communicated with the water outlet 2014 and the circulating water tank 202.

[0039] Specifically, the circulating water pump 204 can be used to draw the cooling water from the circulating water tank 202 into the heat exchanger 201 through the first liquid pipeline 21, and the working power of the circulating water pump 204 can be adjusted to adjust the flow rate and pressure of the cooling water in the first liquid pipeline 21; the third valve 221 arranged on the second liquid pipeline 22 is used to adjust the flow rate of the cooling water; the condensate formed by the high-temperature saturated wet flue gas after being dehumidified and cooled enters the condensate tank 203 through the liquid outlet 2015, so that the water in the high-temperature saturated wet flue gas is recycled; and the fourth liquid pipeline 24 is communicated with the water outlet 2014 and the circulating water tank 202, and the cooling water after heat exchange flows back to the circulating water tank 202 through the water outlet 2014 and the fourth liquid pipeline 24.

[0040] In the example embodiment, the device can further include a second flow sensor 211, a second temperature sensor 212 and a third temperature sensor 241.

[0041] The second flow sensor 211 is arranged on the first liquid pipeline 21 and located between the water inlet 2013 and the communication position of the first liquid pipeline 21 and the second liquid pipeline 22; the second temperature sensor 212 is arranged on the first liquid pipeline 21 and located between the mixer 104 and the gas inlet 2011; and the third temperature sensor 241 is arranged on the fourth liquid pipeline 24.

[0042] Specifically, the second flow sensor 211 is used to measure the flow rate of the cooling water in the first liquid pipeline 21 at the water inlet 2013 and transmit the data to the operation platform in real time; the second temperature sensor 212 is used to measure the temperature of the cooling water in the first liquid pipeline 21 at the water inlet 2013 and transmit the data to the operation platform in real time; and the third temperature sensor 241 is used to measure the temperature of the cooling water flowing back to the circulating water tank 202 in the fourth liquid pipeline 24 and transmit the data to the operation platform in real time.

[0043] In the example embodiment, the gas outlet 2012 is communicated with the exhaust cylinder 301 through the fifth flue gas pipeline 31.

[0044] Further, the fourth temperature sensor 311 is arranged on the fifth flue gas pipeline 31.

[0045] Further, the material of the exhaust cylinder 301 can be stainless steel.

[0046] Specifically, the saturated wet flue gas is subjected to moisture and temperature reduction treatment, and then enters the exhaust cylinder 301 through the fifth flue gas pipeline 31 through the gas outlet 2012, so as to be discharged to the outside; the fourth temperature sensor 311 is used to measure the temperature of the flue gas in the fifth flue gas pipeline 31, and transmit the data to the operation table in real time; since the exhaust cylinder 301 is a pipeline with one end open and the other end closed, a certain amount of moisture is still discharged into the exhaust cylinder 301, therefore, the material of the exhaust cylinder 301 can be stainless steel, so as to avoid the damage caused by the contact between moisture and air, further improve the service life of the device; it should be noted that the material of the exhaust cylinder 301 can be stainless steel only for the exemplary embodiment of the present application, and the material of the exhaust cylinder 301 is not particularly limited in the present application, as long as it can meet the actual demand and is not easy to be damaged.

[0047] In the exemplary embodiment, the heat exchanger 201 can be a shell-and-tube heat exchanger, which has the advantages of large heat transfer area, uniform distribution of cooling water, etc., can improve the heat transfer efficiency, reduce local hot spots and cold spots, and improve the overall heat transfer effect.

[0048] In the exemplary embodiment, the device can further include an operation table and a power supply; wherein the operation table is electrically connected with each component of the device; and the power supply is electrically connected with the operation table and each component of the device.

[0049] In some embodiments, as shown in Figure 3 The operation table can include a temperature control module 401, a valve control module 402 and a data display module 403.

[0050] Specifically, the temperature control module 401 is electrically connected with the flue gas heater 102, and can control the start and stop of the flue gas heater 102 according to the temperature of the high-temperature saturated wet flue gas; the valve control module 402 is electrically connected with the first valve 121, the second valve 141 and the third valve 221 respectively, and adjusts the flow rate of the corresponding flue gas, steam and cooling water by controlling the opening degree of each valve; the data display module 403 is electrically connected with the first flow sensor 131, the first temperature sensor 132, the humidity sensor 133, the second flow sensor 211, the second temperature sensor 212, the third temperature sensor 241 and the fourth temperature sensor 311 respectively, so as to transmit the collected data to the data display module 403 of the operation table, so that the experimental personnel can observe and analyze the data, and further adjust the working condition. The power supply is used to provide power for the entire device and the operation table, so as to make the device operate normally.

[0051] In order to more clearly understand the operation of the power plant flue gas water heat recovery and flue gas white smoke elimination device provided by the embodiments of the present application, the embodiments of the present application also provide an operation process for experiments using the device, which can include: a start-up operation process, a shut-down operation process, and working condition adjustment details.

[0052] As shown in Table 1, the experimental parameter working conditions of the power plant flue gas water heat recovery and flue gas white smoke elimination device provided by the embodiments of the present application are as follows:

[0053] Table 1

[0054] No. Parameter Unit Value 1 Flue gas rated temperature ℃ 50 2 Flue gas temperature range ℃ 40～70 3 Flue gas relative humidity ％ 100 4 Flue gas rated flow m 3 / h]]> 50 5 Flue gas flow range m 3 / h]]> 20～100 6 Steam rated flow kg / h 3 7 Steam flow range kg / h 2～8 8 Cooling water rated flow m 3 / h]]> 0.25 9 Cooling water maximum flow m 3 / h]]> 0～1

[0055] Experimental parameter working condition table

[0056] Specifically, the start-up operation process can include:

[0057] Check whether the power supply wiring of the experimental device, each valve, and each pipeline is leak-proof; close the power supply; introduce tap water into the water tank of the steam generator 103 for flushing, and then discharge the flushing water through the bottom drain valve; turn on the operation panel switch; turn on the centrifugal fan 101 switch; adjust the fan flow rate through the first valve 121 (the default flow rate can be 50 m 3 / h); turn on the control panel pipeline heater power supply; turn on the steam generator 103 switch; inject deionized water into the water tank of the steam generator 103 until the water shortage signal is extinguished; wait for the data display module 403 to display that the temperature of the first temperature sensor 132 reaches the rated temperature (50℃) and the temperature of the fourth temperature sensor 311 reaches close to the rated temperature (50℃); wait for the steam generator 103 pressure indicator to reach 0.2 MPa; open the second valve 141 to inject high-temperature steam into the mixer 104; observe the white smoke condition at the outlet of the exhaust cylinder 301; open the third valve 221 and turn on the circulating water pump 204; adjust the third valve 221 until the data display module 403 displays that the cooling water flow rate reaches the rated flow rate; observe the white smoke condition at the outlet of the exhaust cylinder 301; and observe the recovery of the cooling water in the circulating water tank 202.

[0058] More specifically, the shut-down operation process can include:

[0059] Turn off the steam generator 103 switch; turn off the flue gas heater 102 switch; turn off the circulating water pump 204 switch; close the third valve 221; maintain the operation of the centrifugal fan 101 for more than 0.5 h to cool each flue gas pipeline; when the temperatures of the first temperature sensor 132 and the fourth temperature sensor 311 approach room temperature, close the second valve 141 and turn off the centrifugal fan 101 switch; discharge the residual deionized water in the water tank of the steam generator 103 through the bottom drain valve; turn off the operation panel switch; and open the power supply.

[0060] The working condition adjustment details can include:

[0061] The flue gas flow is controlled by adjusting the opening of the first valve 121, the flue gas temperature is controlled by adjusting the temperature of the flue gas heater 102, the steam pressure is controlled by adjusting the pressure transmitter of the steam outlet 1031 of the steam generator 103 (controlling the pressure of the steam outlet 1031 within 0.3 MPa), and the cooling water flow is controlled by adjusting the opening of the third valve 221. The data display module 403 can record relevant data in real time, and the relevant parameters can be copied to a U disk for learning and research by experimenters.

[0062] The above is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A device for water heat recovery and flue gas whitening of a power plant, characterized in that, The application relates to a circulating water type flue gas heater. The application comprises: a centrifugal fan (101) in communication with external air; a flue gas heater (102) having a flue gas inlet (1021) and a flue gas outlet (1022), and the flue gas inlet (1021) is in communication with the centrifugal fan (101); a steam generator (103) having a steam outlet (1031), and the steam outlet (1031) is in communication with the flue gas outlet (1022) of the flue gas heater (102) through a mixer (104); a heat exchanger (201) having a gas inlet (2011), a gas outlet (2012), a water inlet (2013), a water outlet (2014) and a liquid outlet (2015), and the gas inlet (2011) is in communication with the flue gas outlet (1022) and the steam outlet (1031) respectively through the mixer (104); a circulating water tank (202) in communication with the water inlet (2013) and the water outlet (2014) respectively; a condensate tank (203) in communication with the liquid outlet (2015); 2. The device according to claim 1, wherein, an exhaust cylinder (301) in communication with the gas outlet (2012), and the exhaust cylinder (301) is in communication with the outside. The application further comprises: a first flue gas pipeline (11) in communication with the centrifugal fan (101) and the flue gas inlet (1021); a second flue gas pipeline (12) having one end in communication with the first flue gas pipeline (11) and the other end in communication with the outside, and the second flue gas pipeline (12) is provided with a first valve (121); a third flue gas pipeline (13), and the mixer (104) is arranged on the third flue gas pipeline (13), and the third flue gas pipeline (13) is in communication with the flue gas outlet (1022) and the gas inlet (2011) through the mixer (104); 3. The device according to claim 2, wherein, a fourth flue gas pipeline (14) in communication with the steam outlet (1031) and the mixer (104), and the fourth flue gas pipeline (14) is provided with a second valve (141). The application further comprises: a first flow sensor (131) arranged on the third flue gas pipeline (13) and located between the mixer (104) and the flue gas heater (102); a first temperature sensor (132) arranged on the third flue gas pipeline (13) and located between the mixer (104) and the gas inlet (2011); 4. The device according to claim 1, wherein the device is characterized by: a humidity sensor (133) arranged on the third flue gas pipeline (13) and located between the mixer (104) and the gas inlet (2011). The application further comprises: a first liquid pipeline (21) in communication with the circulating water tank (202) and the water inlet (2013), and the first liquid pipeline (21) is provided with a circulating water pump (204); a second liquid pipeline (22) having one end in communication with the circulating water tank (202) and the other end in communication with the first liquid pipeline (21) at a position between the circulating water pump (204) and the water inlet (2013), and the second liquid pipeline (22) is provided with a third valve (221); a third liquid pipeline (23) in communication with the circulating water tank (202) and the water outlet (2014), and the third liquid pipeline (23) is provided with a fourth valve (231); and a fourth liquid pipeline (24) in communication with the condensate tank (203) and the liquid outlet (2015), and the fourth liquid pipeline (24) is provided with a fifth valve (241). A third liquid pipeline (23) is arranged to connect the condensate tank (203) and the liquid outlet (2015); A fourth liquid pipeline (24) is arranged to connect the water outlet (2014) and the circulating water tank (202).

5. The device according to claim 4, wherein the device is characterized by: Further comprising: A second flow sensor (211) is arranged on the first liquid pipeline (21) and located between the water inlet (2013) and the connection position of the first liquid pipeline (21) and the second liquid pipeline (22); A second temperature sensor (212) is arranged on the first liquid pipeline (21) and located between the mixer (104) and the gas inlet (2011); A third temperature sensor (241) is arranged on the fourth liquid pipeline (24).

6. The device of claim 1, wherein the device is characterized by: The gas outlet (2012) and the exhaust cylinder (301) are connected by a fifth flue gas pipeline (31).

7. The device according to claim 6, wherein the device is characterized by: Further comprising: A fourth temperature sensor (311) is arranged on the fifth flue gas pipeline (31).

8. The device of claim 1, wherein the device is characterized by: The material of the exhaust cylinder (301) is stainless steel.

9. The device for water heat recovery and flue gas whitening according to claim 1, characterized in that, The heat exchanger (201) is a shell-and-tube heat exchanger.

10. The device of claim 1, wherein, Further comprising: An operation platform is electrically connected with each component of the device; A power supply is electrically connected with the operation platform and each component of the device.

Images