A boiler flue gas water recovery device for a thermal power plant

Abstract

The present application relates to the technical field of flue gas water recovery, and specifically discloses a flue gas water recovery device for a boiler of a thermal power plant, which comprises a flue gas connecting pipeline one, a primary pressurizing bin, a secondary pressurizing bin, a heat exchange mechanism one, a heat exchange mechanism two, a condensation bin, a heat exchange mechanism three and a dehumidification mechanism; in the present application, the primary pressurizing bin can initially pressurize the water in the flue gas, liquefy the water vapor contained in the flue gas, and transfer the water vapor to a solution, and in this process, the release of latent heat of vaporization is completed; then, through secondary pressurization, the release process of latent heat is repeated, so that the heat of the flue gas can be fully released; through the heat exchange mechanism three, the heat exchange mechanism one and the heat exchange mechanism two, multi-stage heat absorption is performed, the heat absorption rate is improved, the heat recovery effect is greatly improved, and the utilization rate of waste heat is improved; and through the multi-level full absorption of water by the liquid desiccant, the contact area between the liquid desiccant and the flue gas is increased, and the absorption time is prolonged, so that the full removal of water in the flue gas is ultimately achieved.

Description

Technical Field

[0001] This invention relates to the field of flue gas and water recovery technology, specifically to a flue gas and water recovery device for a thermal power plant boiler. Background Technology

[0002] Coal combustion in thermal power plants produces several environmentally harmful flue gas byproducts, primarily water vapor, carbon dioxide, nitrogen, and sulfides. Water vapor accounts for 5%-11% of the total flue gas content. Thermal power plant flue gas also contains significant amounts of low-grade waste heat and water vapor. Wet desulfurization methods are commonly used in thermal power plants. The outlet flue gas from these systems is typically saturated, with water vapor comprising 12%-18%, indicating considerable recoverability.

[0003] Traditional steam recovery devices typically involve passing a dehumidifying agent through the flue gas to absorb moisture. However, due to their simple and straightforward operation, they are not very effective at dehumidifying the flue gas and have a very low heat recovery rate, resulting in a waste of resources. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention provide a flue gas and water recovery device for thermal power plant boilers, comprising:

[0006] The flue gas connection pipe 1 has its inlet connected to the outlet flue of the desulfurization absorption tower, and a control valve 1 is installed inside the pipe;

[0007] A primary pressurization chamber, which is connected to the outlet of the flue gas connecting pipe 1;

[0008] The secondary pressurization chamber has its inlet connected to the outlet of the primary pressurization chamber via a second flue gas connection pipe, which is equipped with a second control valve. The secondary pressurization chamber is also equipped with a power pressurization mechanism.

[0009] Heat exchange mechanism one is located outside and in close contact with the primary pressurization chamber;

[0010] The second heat exchange mechanism is located outside and in close contact with the secondary pressurization chamber;

[0011] The condensation chamber is connected to the secondary pressurization chamber via a nozzle fitting. The outlet end of the nozzle fitting extends into the condensation chamber, and its end is equipped with a control valve and a spray hole facing the inner wall of the condensation chamber. The top of the condensation chamber is connected to a flue gas purification device via a flue gas exhaust pipe.

[0012] Heat exchange mechanism three is located outside and attached to the condensation chamber. Heat exchange mechanism three is connected to heat exchange mechanism one and heat exchange mechanism two respectively. The heat exchange medium can perform primary heat exchange along heat exchange mechanism three, and then flow into heat exchange mechanism one and heat exchange mechanism two respectively for secondary heat exchange.

[0013] The dehumidification mechanism is connected to the primary pressurization chamber, the secondary pressurization chamber and the condensation chamber respectively, and sprays liquid dehumidifier into the chamber to dehumidify the flue gas inside.

[0014] The power pressurization mechanism includes:

[0015] The pressure plate is a cylindrical structure with an opening at one end; the pressure plate is located at the opening of the secondary pressure chamber, and its edge sidewall forms a sliding seal structure with the inner wall of the secondary pressure chamber.

[0016] A fixed bracket is connected to the outside of the secondary pressurization chamber, at the end corresponding to the pressurization plate;

[0017] A pressure rod, one end of which is fixedly connected to the outer wall of the pressure plate, and the other end of which is slidably connected to the fixed bracket;

[0018] A screw-on plate is vertically fixed to the end of the pressure rod.

[0019] A drive motor is connected to the fixed bracket and corresponds to the rotating plate.

[0020] A screw-on rod, one end of which is connected to the drive motor, and the other end of which is screwed onto the screw-on plate;

[0021] A sliding rod is arranged parallel to the screw-in rod, with one end fixed to the fixed bracket and the other end slidably connected to the screw-in plate.

[0022] The dehumidification mechanism includes:

[0023] A desiccant storage tank is equipped with a booster pump and filled with liquid desiccant; the liquid outlet pipe of the desiccant storage tank is respectively inserted into the primary booster chamber and the condensation chamber, and each is equipped with a spray pipe;

[0024] Several spray heads are provided and installed on the spray pipe respectively for spraying the liquid desiccant;

[0025] A return pipe is used to connect the primary pressurization chamber and the condensation chamber to the desiccant storage tank; both the liquid outlet pipe and the return pipe are equipped with control valves.

[0026] It also includes a control component; the control component includes:

[0027] Temperature detection component one is installed at the liquid inlet of the heat exchange mechanism one, and is used to measure the liquid temperature at the liquid inlet end;

[0028] Temperature detection component two is installed at the liquid outlet of heat exchange mechanism two and heat exchange mechanism three, and is used to measure the liquid temperature at the liquid outlet.

[0029] Temperature detection component three is installed inside the exhaust duct and is used to measure the exhaust temperature of the flue gas.

[0030] Humidity detection component one is installed inside the exhaust duct and is used to measure the humidity of the exhaust gas;

[0031] Pressure detection component one is installed inside the primary pressurization chamber and is used to detect the pressure inside the primary pressurization chamber;

[0032] Pressure detection component two is installed inside the secondary pressurization chamber and is used to detect the pressure inside the secondary pressurization chamber;

[0033] The controller is electrically connected to the temperature detection component 1, temperature detection component 2, temperature detection component 3, humidity detection component 1, pressure detection component 1, pressure detection component 2, control valve 1, control valve 2, control valve 3, control valve 4, drive motor, and booster pump, respectively.

[0034] The controller controls the amount of flue gas entering and exiting the primary pressurization chamber by controlling the opening and closing of control valve one and control valve two, thereby controlling the gas pressure in the primary pressurization chamber.

[0035] The controller controls the amount of flue gas entering and exiting the secondary pressurization chamber by controlling the opening and closing degrees of the control valves 2 and 3, thereby controlling the air pressure inside the secondary pressurization chamber; and by controlling the drive motor, it can drive the pressure rod and the pressure plate to adjust the spatial volume inside the secondary pressurization chamber, thereby achieving secondary regulation of the air pressure inside the secondary pressurization chamber.

[0036] It also includes a sampling mechanism, which comprises:

[0037] The sample storage box is connected to the desiccant storage box via a sampling tube;

[0038] A suction pump is used to provide suction power;

[0039] A sampling tube is connected to the sample storage box, and a valve is provided inside the tube for taking samples from the sample storage box.

[0040] The temperature difference between the first temperature detection component and the second temperature detection component is a temperature difference value.

[0041] When controlling the flow velocity of a heat exchange medium in the first heat exchange mechanism according to the range value of temperature difference data, the range value H of the temperature difference data is determined, a range value matrix H0 of preset temperature difference data is set, and H0(H1, H2, H3, H4) is defined, wherein H1 is a first preset range value of temperature difference data, H2 is a second preset range value of temperature difference data, H3 is a third preset range value of temperature difference data, H4 is a fourth preset range value of temperature difference data, and H1<H2<H3<H4;

[0042] A flow velocity range value B for supplying the heat exchange medium is determined, a flow velocity matrix B0 of preset supply heat exchange medium is set, and B0(B1, B2, B3, B4) is defined, wherein B1 is a first preset flow velocity for supplying the heat exchange medium, B2 is a second preset flow velocity for supplying the heat exchange medium, B3 is a third preset flow velocity for supplying the heat exchange medium, B4 is a fourth preset flow velocity for supplying the heat exchange medium, and B1<B2<B3<B4;

[0043] setting the flow velocity of the supplied heat exchange medium according to the relationship between the range value H of the temperature difference data and the flow velocity of the supplied heat exchange medium:

[0044] when H<H1, selecting the first preset flow velocity B4 for supplying the heat exchange medium as the flow velocity of the supplied heat exchange medium;

[0045] when H1≤H<H2, selecting the second preset flow velocity B3 for supplying the heat exchange medium as the flow velocity of the supplied heat exchange medium;

[0046] when H2≤H<H3, selecting the third preset flow velocity B2 for supplying the heat exchange medium as the flow velocity of the supplied heat exchange medium;

[0047] when H3≤H<H4, selecting the fourth preset flow velocity B1 for supplying the heat exchange medium as the flow velocity of the supplied heat exchange medium.

[0048] The temperature data detected by the third temperature detection component is flue gas discharge temperature data;

[0049] When controlling the flow velocity of the heat exchange medium in the first heat exchange mechanism according to the range value of flue gas discharge temperature data, the range value F of the flue gas discharge temperature data is determined, a range value matrix F0 of preset flue gas discharge temperature data is set, and F0(F1, F2, F3, F4) is defined, wherein F1 is a first preset range value of flue gas discharge temperature data, F2 is a second preset range value of flue gas discharge temperature data, F3 is a third preset range value of flue gas discharge temperature data, F4 is a fourth preset range value of flue gas discharge temperature data, and F1<F2<F3<F4;

[0050] Determine the velocity range D of the supplied heat exchange medium, preset the velocity matrix D0 of the supplied heat exchange medium, and set D0(D1, D2, D3, D4), where D1 is the first preset velocity of the supplied heat exchange medium, D2 is the second preset velocity of the supplied heat exchange medium, D3 is the third preset velocity of the supplied heat exchange medium, and D4 is the fourth preset velocity of the supplied heat exchange medium, and D1 < D2 < D3 < D4;

[0051] The flow rate of the supplied heat exchange medium is set according to the relationship between the range value F of the flue gas discharge temperature data and the flow rate of the supplied heat exchange medium:

[0052] When F < F1, the flow rate D1 of the first preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium.

[0053] When F1≤F<F2, the flow rate D2 of the second preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium;

[0054] When F2≤F<F3, the flow rate D3 of the third preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium;

[0055] When F3≤F<F4, the flow rate D4 of the fourth preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium.

[0056] The humidity data detected by the humidity detection component is the humidity data of the exhaust gas;

[0057] When controlling the circulation speed of the liquid desiccant in the dehumidification mechanism based on the range value of the flue gas exhaust humidity data, the range value S of the flue gas exhaust humidity data is determined, and a preset range value matrix S0 of the flue gas exhaust humidity data is set, with S0 (S1, S2, S3, S4), where S1 is the first preset range value of the flue gas exhaust humidity data, S2 is the second preset range value of the flue gas exhaust humidity data, S3 is the third preset range value of the flue gas exhaust humidity data, and S4 is the fourth preset range value of the flue gas exhaust humidity data, and S1 < S2 < S3 < S4.

[0058] Determine the circulation speed range E of the liquid desiccant, preset the circulation speed matrix E0 of the liquid desiccant, and set E0 (E1, E2, E3, E4), where E1 is the first preset circulation speed of the liquid desiccant, E2 is the second preset circulation speed of the liquid desiccant, E3 is the third preset circulation speed of the liquid desiccant, and E4 is the fourth preset circulation speed of the liquid desiccant, and E1 < E2 < E3 < E4;

[0059] The circulation speed of the liquid desiccant is set according to the relationship between the range value S of the flue gas exhaust humidity data and the circulation speed of the liquid desiccant:

[0060] When S < S1, the circulation speed E1 of the first preset liquid desiccant is selected as the circulation speed of the liquid desiccant.

[0061] When S1≤S<S2, the circulation speed E2 of the second preset liquid desiccant is selected as the circulation speed of the liquid desiccant.

[0062] When S2≤S<S3, the circulation speed E3 of the third preset liquid desiccant is selected as the circulation speed of the liquid desiccant.

[0063] When S3≤S<S4, the circulation speed E4 of the fourth preset liquid desiccant is selected as the circulation speed of the liquid desiccant.

[0064] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Other features and aspects of this disclosure will become clearer from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0065] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0066] Figure 1 This is a schematic diagram of the principle of the flue gas and water recovery device for thermal power plant boilers in an embodiment of the present invention.

[0067] Figure 2 yes Figure 1 The diagram shows the structure of a flue gas and water recovery device for a thermal power plant boiler.

[0068] Figure 3 yes Figure 2 The image shows a side view of a flue gas and water recovery device for a thermal power plant boiler.

[0069] Figure 4 yes Figure 3 The cross-sectional view shown is from the perspective of BB.

[0070] Figure 5 yes Figure 1 The diagram shows the control principle of a flue gas and water recovery device for a thermal power plant boiler.

[0071] Figure label:

[0072] 1. Flue gas connection pipe one; 2. Primary pressurization chamber; 3. Secondary pressurization chamber; 30. Control valve two; 31. Power pressurization mechanism; 310. Pressurization plate; 311. Fixed bracket; 312. Pressure rod; 313. Screw-connected plate; 314. Drive motor; 315. Screw-connected rod; 316. Sliding rod; 4. Heat exchange mechanism one; 5. Heat exchange mechanism two; 6. Condensation chamber; 60. Spray pipe fitting; 61. Control valve three; 7. Heat exchange mechanism three; 80. Dehumidifier storage tank; 81. Spray head; 82. Return pipe; 83. Spray pipe; 84. Control valve four; 9. Sampling mechanism; 10. Control valve one. Detailed Implementation

[0073] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0074] As in the background technology, traditional water vapor recovery devices generally allow the flue gas to absorb moisture through a dehumidifying agent. However, due to the simple and singular operation structure, the dehumidification effect on the flue gas is poor, and the heat recovery rate in the flue gas is very low, resulting in a waste of resources.

[0075] To address the aforementioned issues, this application proposes a flue gas and water recovery device for thermal power plant boilers, which improves the treatment efficiency of coal-containing wastewater and reduces treatment costs and operational complexity.

[0076] Reference Figures 1-5 As shown, an embodiment of the present invention provides a flue gas water recovery device for a thermal power plant boiler, comprising: a flue gas connecting pipe 1, a primary pressurization chamber 2, a secondary pressurization chamber 3, a heat exchange mechanism 4, a heat exchange mechanism 5, a condensation chamber 6, a heat exchange mechanism 3, and a dehumidification mechanism; wherein,

[0077] The inlet of flue gas connecting pipe 1 is connected to the outlet flue of the desulfurization absorption tower, and a control valve 10 is installed inside the pipe; the primary pressurization chamber 2 is connected to the outlet of flue gas connecting pipe 1; the inlet of the secondary pressurization chamber 3 is connected to the outlet of the primary pressurization chamber 2 through a second flue gas connecting pipe, and a control valve 20 is installed inside the flue gas connecting pipe; a power pressurization mechanism 31 is installed inside the secondary pressurization chamber 3; a heat exchange mechanism 4 is located outside and attached to the primary pressurization chamber 2; a second heat exchange mechanism 5 is located outside and attached to the secondary pressurization chamber 3; the condensation chamber 6 is connected to the secondary pressurization chamber 3 through a nozzle fitting 60. The outlet end penetrates into the condensation chamber 6, and its end is equipped with a control valve 3 61 and a spray hole facing the inner wall of the condensation chamber 6. The top of the condensation chamber 6 is connected to the flue gas purification equipment through a flue gas exhaust pipe. The heat exchange mechanism 3 7 is set outside the condensation chamber 6 and fits against it. The heat exchange mechanism 3 7 is connected to the heat exchange mechanism 1 4 and the heat exchange mechanism 2 5 respectively. The heat exchange medium can perform primary heat exchange along the heat exchange mechanism 3 7, and then flow into the heat exchange mechanism 1 4 and the heat exchange mechanism 2 5 respectively for secondary heat exchange. The dehumidification mechanism is connected to the primary pressurization chamber 2, the secondary pressurization chamber 3 and the condensation chamber 6 respectively, and sprays liquid dehumidifier into its interior to dehumidify the internal flue gas.

[0078] In the present invention, the primary pressurization chamber can initially pressurize the moisture in the flue gas, causing the water vapor contained in the flue gas to liquefy and migrate into the solution. At the same time, the latent heat of vaporization is released during this process. Then, the latent heat release process is repeated through secondary pressurization, which can achieve the full release of heat in the flue gas. Through heat exchange mechanism three, heat exchange mechanism one, and heat exchange mechanism two, the heat absorption rate is improved, the heat recovery effect is greatly improved, and the utilization rate of waste heat is increased. Furthermore, the liquid desiccant fully absorbs moisture in multiple stages, increasing the contact area between the liquid desiccant and the flue gas and extending the absorption time, ultimately achieving the full removal of moisture from the flue gas.

[0079] In the aforementioned flue gas and water recovery device for thermal power plant boilers, the power pressurization mechanism 31 includes: a pressure plate 310, a fixed bracket 311, a pressure rod 312, a swivel plate 313, a drive motor 314, a swivel rod 315, and a sliding rod 316; wherein...

[0080] The secondary pressurization chamber 3 has a cylindrical structure with an open end. A pressure plate 310 is positioned at the opening of the secondary pressurization chamber 3, with its edge sidewall forming a sliding seal with the inner wall of the secondary pressurization chamber 3. A fixed bracket 311 is connected to the outside of the secondary pressurization chamber 3, corresponding to the end of the pressure plate 310. One end of a pressure rod 312 is fixedly connected to the outer wall of the pressure plate 310, and the other end is slidably connected to the fixed bracket 311. A swivel plate 313 is vertically fixed to the end of the pressure rod 312. A drive motor 314 is connected to the fixed bracket 311 and corresponds to the swivel plate 313. One end of a swivel rod 315 is connected to the drive motor 314, and the other end is swivelly connected to the swivel plate 313. A sliding rod 316 is arranged parallel to the swivel rod 315, with one end fixed to the fixed bracket 311 and the other end slidably connected to the swivel plate 313.

[0081] It should be understood that the movement of the drive motor 314 can drive the swivel plate 313 to reciprocate along the swivel rod 315 and the sliding rod 316; thereby driving the pressure rod 312 and the pressure plate 310 to move to squeeze and reset the flue gas in the secondary pressurization chamber 3, realize multi-stage pressure, ensure the full release of the latent heat of water vapor in the flue gas, and help to fully improve the utilization rate of flue gas waste heat.

[0082] It should be understood that the heat exchange medium in heat exchange mechanism 3 7 undergoes heat exchange in condensation chamber 6 to achieve preheating, and then enters heat exchange mechanism 1 4 and heat exchange mechanism 2 5. Since the flue gas in primary pressurization chamber 2 and secondary pressurization chamber 3 releases latent heat under pressure difference, the temperature is higher. Therefore, the heat exchange medium in heat exchange mechanism 1 4 and heat exchange mechanism 2 5 further undergoes heat exchange, further increasing the temperature and improving the preheating absorption effect.

[0083] In the aforementioned flue gas water recovery device for thermal power plant boilers, the dehumidification mechanism includes: a desiccant storage tank 80, a spray head 81, and a return pipe 82; wherein,

[0084] The desiccant storage tank 80 is equipped with a booster pump and filled with liquid desiccant. The outlet pipe of the desiccant storage tank 80 is inserted into the primary booster chamber 2 and the condensation chamber 6, and each is equipped with a spray pipe 83. Several spray heads 81 are installed on the spray pipes 83 for spraying liquid desiccant. The return pipe 82 is used to connect the primary booster chamber 2 and the condensation chamber 6 to the desiccant storage tank 80. Control valves 84 are installed in both the outlet pipe and the return pipe 82.

[0085] It should be understood that the water vapor in the flue gas is liquefied in the primary pressurization chamber 2 under the action of pressure difference. The dehumidification mechanism absorbs the liquid by spraying liquid desiccant, and can also make full contact with the flue gas during the spraying process to absorb the uncondensed water vapor in the flue gas and improve the dehumidification effect. In the condensation chamber 6, due to the heat exchange mechanism 4 on the outer wall of the condensation chamber 6, its inner wall is kept at a low temperature. The flue gas sprayed on the inner wall of the condensation chamber 6 will cause the flue gas inside to pre-cool and condense water droplets. The dehumidification mechanism repeats the spraying process to absorb the condensed water droplets and water vapor in the flue gas a second time, further improving the dehumidification effect.

[0086] It should be noted that control valve 1, control valve 2, control valve 3, and control valve 4 are all existing technologies, and are preferably one-way control valves.

[0087] The aforementioned flue gas and water recovery device for thermal power plant boilers also includes a sampling mechanism 9, which comprises: a sample storage box, a suction pump, and a sampling tube; wherein,

[0088] The sample storage box is connected to the desiccant storage box 80 via a sampling tube; a suction pump is used to provide suction power; the sampling tube is connected to the sample storage box and has a valve inside for taking samples from the sample storage box.

[0089] It should be understood that the liquid desiccant in the desiccant storage box 80 can be sampled and tested by the sampling mechanism 9, and the liquid desiccant can be replaced or its concentration adjusted when it does not meet the concentration standard.

[0090] The aforementioned flue gas and water recovery device for thermal power plant boilers also includes a control component; the control component includes: temperature detection component one, temperature detection component two, temperature detection component three, humidity detection component one, pressure detection component one, pressure detection component two, and a controller; wherein,

[0091] Temperature detection component one is installed at the inlet of heat exchange mechanism one 4 to measure the liquid temperature at the inlet; temperature detection component two is installed at the outlets of heat exchange mechanism two 5 and heat exchange mechanism three 7 to measure the liquid temperature at the outlet; temperature detection component three is installed inside the flue gas duct to measure the exhaust temperature of the flue gas; humidity detection component one is installed inside the flue gas duct to measure the exhaust humidity of the flue gas; pressure detection component one is installed inside the primary pressurization chamber 2 to detect the pressure inside the primary pressurization chamber 2; pressure detection component two is installed inside the secondary pressurization chamber 3 to detect the pressure inside the secondary pressurization chamber 3; the controller is electrically connected to temperature detection component one, temperature detection component two, temperature detection component three, humidity detection component one, pressure detection component one, pressure detection component two, control valve one 10, control valve two 30, control valve three 61, control valve four 84, drive motor 314, and booster pump, respectively.

[0092] It should be noted that temperature detection component 1, temperature detection component 2, and temperature detection component 3 are all existing technologies, and are preferably temperature sensors; humidity detection component 1 is existing technology, and is preferably a humidity sensor; pressure detection component 1 and pressure detection component 2 are existing technologies, and are preferably pressure sensors; the controller is existing technology, and is preferably a PLC controller with programming function.

[0093] In the above-mentioned flue gas and water recovery device for boilers in thermal power plants, the controller controls the amount of flue gas entering and exiting the primary pressurization chamber 2 by controlling the opening and closing of control valve 10 and control valve 20, thereby controlling the gas pressure in the primary pressurization chamber 2.

[0094] The controller controls the amount of flue gas entering and exiting the secondary pressurization chamber 3 by controlling the opening and closing of control valve 2 30 and control valve 3 61, thereby controlling the air pressure in the primary pressurization chamber 2; and by controlling the drive motor 314, it can drive the pressure rod 312 and the pressure plate 310 to adjust the spatial volume in the secondary pressurization chamber 3, thereby realizing the secondary regulation of the air pressure in the secondary pressurization chamber 3.

[0095] It should be noted that heat exchange mechanism 1 (4), heat exchange mechanism 2 (5), and heat exchange mechanism 3 (7) are all existing technologies, preferably liquid heat exchange mechanisms, and the internal heat exchange medium is preferably water. The flow rate of the water inside is controlled by the power component of heat exchange mechanism 1.

[0096] In the above-mentioned flue gas and water recovery device for boilers in thermal power plants, the temperature difference between temperature detection component one and temperature detection component two is the temperature difference value data.

[0097] When controlling the flow rate of the heat exchange medium inside the heat exchange mechanism 4 based on the range of temperature difference data, the range of temperature difference data H is determined, the range matrix of temperature difference data H0 is preset, and H0 (H1, H2, H3, H4) is set, where H1 is the range of the first preset temperature difference data, H2 is the range of the second preset temperature difference data, H3 is the range of the third preset temperature difference data, and H4 is the range of the fourth preset temperature difference data, and H1 < H2 < H3 < H4;

[0098] Determine the flow rate range B of the supplied heat exchange medium, preset the flow rate matrix B0 of the supplied heat exchange medium, and set B0(B1, B2, B3, B4), where B1 is the first preset flow rate of the supplied heat exchange medium, B2 is the second preset flow rate of the supplied heat exchange medium, B3 is the third preset flow rate of the supplied heat exchange medium, and B4 is the fourth preset flow rate of the supplied heat exchange medium, and B1 < B2 < B3 < B4;

[0099] The flow rate of the heat exchange medium is set based on the relationship between the temperature difference range H and the flow rate of the supplied heat exchange medium:

[0100] When H<H1, select the preset first flow rate B4 of the supplied heat exchange medium as the flow rate of the supplied heat exchange medium;

[0101] When H1≤H<H2, select the preset second flow rate B3 of the supplied heat exchange medium as the flow rate of the supplied heat exchange medium;

[0102] When H2≤H<H3, select the preset third flow rate B2 of the supplied heat exchange medium as the flow rate of the supplied heat exchange medium;

[0103] When H3≤H<H4, select the preset fourth flow rate B1 of the supplied heat exchange medium as the flow rate of the supplied heat exchange medium.

[0104] It should be understood that when the temperature difference between the first temperature detection component and the second temperature detection component is small, it indicates that the heat absorption amount of the heat exchange medium is very low and heat absorption is insufficient. This may be caused by too short heat exchange time due to excessive flow rate. Therefore, the heat exchange time is increased by reducing the flow rate of the heat exchange medium, so as to improve the heat exchange effect; on the contrary, the problem that waste heat is not completely absorbed may exist, and it is necessary to greatly increase the flow rate of the heat exchange medium to ensure sufficient absorption of waste heat.

[0105] In the above water recovery device for flue gas of a thermal power plant boiler, the temperature data detected by the third temperature detection component is flue gas discharge temperature data;

[0106] When controlling the flow rate of the heat exchange medium in the first heat exchange mechanism 4 according to the range value of the flue gas discharge temperature data, the range value F of the flue gas discharge temperature data is determined, a preset range value matrix F0 of the flue gas discharge temperature data is set, F0(F1,F2,F3,F4) is defined, wherein F1 is a first preset range value of the flue gas discharge temperature data, F2 is a second preset range value of the flue gas discharge temperature data, F3 is a third preset range value of the flue gas discharge temperature data, F4 is a fourth preset range value of the flue gas discharge temperature data, and F1<F2<F3<F4;

[0107] The flow rate range value D of the supplied heat exchange medium is determined, a preset flow rate matrix D0 of the supplied heat exchange medium is set, D0(D1,D2,D3,D4) is defined, wherein D1 is a first preset flow rate of the supplied heat exchange medium, D2 is a second preset flow rate of the supplied heat exchange medium, D3 is a third preset flow rate of the supplied heat exchange medium, D4 is a fourth preset flow rate of the supplied heat exchange medium, and D1<D2<D3<D4;

[0108] Set the flow rate of the supplied heat exchange medium according to the relationship between the range value F of the flue gas discharge temperature data and the flow rate of the supplied heat exchange medium:

[0109] When F<F1, select the first preset flow rate D1 of the supplied heat exchange medium as the flow rate of the supplied heat exchange medium;

[0110] When F1≤F<F2, the second preset flow rate D2 of the heat exchange medium is selected as the flow rate of the heat exchange medium.

[0111] When F2≤F<F3, the third preset flow rate D3 of the heat exchange medium is selected as the flow rate of the heat exchange medium.

[0112] When F3≤F<F4, the fourth preset flow rate D4 of the heat exchange medium is selected as the flow rate of the heat exchange medium.

[0113] It should be understood that when the temperature of temperature detection component three is low, it indicates that the flue gas is discharged at a low temperature, and the heat exchange effect is good. There is no need to significantly increase the flow rate of the heat exchange medium, as heat absorption can be relatively sufficient. Conversely, if the flue gas discharge temperature is high, it indicates that the flue gas heat absorption is insufficient. This may be caused by the flow rate being too slow, leading to heat absorption saturation of the heat exchange medium. Therefore, by significantly increasing the amount of heat exchange medium used for heat exchange, the heat exchange efficiency and effect can be improved.

[0114] In the above-mentioned flue gas water recovery device for boilers in thermal power plants, the humidity data detected by the humidity detection component is the humidity data of the discharged flue gas.

[0115] When controlling the flow rate of the heat exchange medium inside the heat exchange mechanism 4 based on the range of flue gas exhaust humidity data, the range value S of the flue gas exhaust humidity data is determined, and the range value matrix S0 of the flue gas exhaust humidity data is preset. S0 is set as (S1, S2, S3, S4), where S1 is the first preset range value of flue gas exhaust humidity data, S2 is the second preset range value of flue gas exhaust humidity data, S3 is the third preset range value of flue gas exhaust humidity data, and S4 is the fourth preset range value of flue gas exhaust humidity data, and S1 < S2 < S3 < S4.

[0116] Determine the circulation speed range E of the liquid desiccant, preset the flow rate matrix E0 of the liquid desiccant circulation speed, and set E0 (E1, E2, E3, E4), where E1 is the first preset circulation speed of the liquid desiccant, E2 is the second preset circulation speed of the liquid desiccant, E3 is the third preset circulation speed of the liquid desiccant, and E4 is the fourth preset circulation speed of the liquid desiccant, and E1 < E2 < E3 < E4;

[0117] The circulation speed of the liquid desiccant is set based on the relationship between the range value S of the flue gas exhaust humidity data and the circulation speed of the supplied liquid desiccant:

[0118] When S < S1, the circulation speed E1 of the first preset liquid desiccant is selected as the circulation speed of the liquid desiccant.

[0119] When S1≤S<S2, the circulation speed E2 of the second preset liquid desiccant is selected as the circulation speed of the liquid desiccant.

[0120] When S2≤S<S3, the circulation speed E3 of the third preset liquid desiccant is selected as the circulation speed of the liquid desiccant.

[0121] When S3≤S<S4, the circulation speed E4 of the fourth preset liquid desiccant is selected as the circulation speed of the liquid desiccant.

[0122] It should be understood that when the humidity data of the exhaust gas detected by the humidity detection component is low, it indicates that the moisture absorption effect in the flue gas is good, and there is no need to significantly increase the spraying efficiency of the liquid desiccant; conversely, it indicates that the moisture absorption effect in the flue gas is poor, and it is necessary to significantly increase the spraying efficiency of the liquid desiccant in order to greatly improve the moisture absorption efficiency and dehumidification effect.

[0123] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0124] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0125] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0126] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0127] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0128] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flue gas and water recovery device for a thermal power plant boiler, characterized in that, include: The flue gas connection pipe 1 has its inlet connected to the outlet flue of the desulfurization absorption tower, and a control valve 1 is installed inside the pipe; A primary pressurization chamber, which is connected to the outlet of the flue gas connecting pipe 1; The secondary pressurization chamber has its inlet connected to the outlet of the primary pressurization chamber via a second flue gas connection pipe, which is equipped with a second control valve. The secondary pressurization chamber is also equipped with a power pressurization mechanism. Heat exchange mechanism one is located outside and in close contact with the primary pressurization chamber; The second heat exchange mechanism is located outside and in close contact with the secondary pressurization chamber; The condensation chamber is connected to the secondary pressurization chamber via a nozzle fitting. The outlet end of the nozzle fitting extends into the condensation chamber, and its end is equipped with a control valve and a spray hole facing the inner wall of the condensation chamber. The top of the condensation chamber is connected to a flue gas purification device via a flue gas exhaust pipe. Heat exchange mechanism three is located outside and attached to the condensation chamber. Heat exchange mechanism three is connected to heat exchange mechanism one and heat exchange mechanism two respectively. The heat exchange medium can perform primary heat exchange along heat exchange mechanism three, and then flow into heat exchange mechanism one and heat exchange mechanism two respectively for secondary heat exchange. The dehumidification mechanism is connected to the primary pressurization chamber, the secondary pressurization chamber and the condensation chamber respectively, and sprays liquid dehumidifier into the chamber to dehumidify the flue gas inside. The power pressurization mechanism includes: The pressure plate is a cylindrical structure with an opening at one end; the pressure plate is located at the opening of the secondary pressure chamber, and its edge sidewall forms a sliding seal structure with the inner wall of the secondary pressure chamber. A fixed bracket is connected to the outside of the secondary pressurization chamber, at the end corresponding to the pressurization plate; A pressure rod, one end of which is fixedly connected to the outer wall of the pressure plate, and the other end of which is slidably connected to the fixed bracket; A screw-on plate is vertically fixed to the end of the pressure rod. A drive motor is connected to the fixed bracket and corresponds to the rotating plate. A screw-on rod, one end of which is connected to the drive motor, and the other end of which is screwed onto the screw-on plate; A sliding rod is arranged parallel to the screw-in rod, with one end fixed to the fixed bracket and the other end slidably connected to the screw-in plate. The dehumidification mechanism includes: A desiccant storage tank is equipped with a booster pump and filled with liquid desiccant; the liquid outlet pipe of the desiccant storage tank is respectively inserted into the primary booster chamber and the condensation chamber, and each is equipped with a spray pipe; Several spray heads are provided and installed on the spray pipe respectively for spraying the liquid desiccant; A return pipe is used to connect the primary pressurization chamber and the condensation chamber to the desiccant storage tank; both the liquid outlet pipe and the return pipe are equipped with control valves. It also includes a control component; the control component includes: Temperature detection component one is installed at the liquid inlet of the heat exchange mechanism one, and is used to measure the liquid temperature at the liquid inlet end; Temperature detection component two is installed at the liquid outlet of heat exchange mechanism two and heat exchange mechanism three, and is used to measure the liquid temperature at the liquid outlet. Temperature detection component three is installed inside the exhaust duct and is used to measure the exhaust temperature of the flue gas. Humidity detection component one is installed inside the exhaust duct and is used to measure the humidity of the exhaust gas; Pressure detection component one is installed inside the primary pressurization chamber and is used to detect the pressure inside the primary pressurization chamber; Pressure detection component two is installed inside the secondary pressurization chamber and is used to detect the pressure inside the secondary pressurization chamber; The controller is electrically connected to the temperature detection component 1, temperature detection component 2, temperature detection component 3, humidity detection component 1, pressure detection component 1, pressure detection component 2, control valve 1, control valve 2, control valve 3, control valve 4, drive motor, and booster pump, respectively. The controller controls the amount of flue gas entering and exiting the primary pressurization chamber by controlling the opening and closing of control valve one and control valve two, thereby controlling the gas pressure in the primary pressurization chamber. The controller controls the amount of flue gas entering and exiting the secondary pressurization chamber by controlling the opening and closing degrees of the control valves 2 and 3, thereby controlling the air pressure inside the secondary pressurization chamber; and by controlling the drive motor, it can drive the pressure rod and the pressure plate to adjust the spatial volume inside the secondary pressurization chamber, thereby achieving secondary regulation of the air pressure inside the secondary pressurization chamber.

2. The flue gas and water recovery device for a thermal power plant boiler according to claim 1, characterized in that, It also includes a sampling mechanism, which comprises: The sample storage box is connected to the desiccant storage box via a sampling tube; A suction pump is used to provide suction power; A sampling tube is connected to the sample storage box, and a valve is provided inside the tube for taking samples from the sample storage box.

3. The flue gas and water recovery device for a thermal power plant boiler according to claim 1, characterized in that, The temperature difference between the first temperature detection component and the second temperature detection component is a temperature difference value. When controlling the flow rate of the internal heat exchange medium of the heat exchange mechanism based on the range of temperature difference data, the range value H of the temperature difference data is determined, the range value matrix H0 of the temperature difference data is preset, and H0 (H1, H2, H3, H4) is set, where H1 is the range value of the first preset temperature difference data, H2 is the range value of the second preset temperature difference data, H3 is the range value of the third preset temperature difference data, H4 is the range value of the fourth preset temperature difference data, and H1 < H2 < H3 < H4; Determine the flow rate range B of the supplied heat exchange medium, preset the flow rate matrix B0 of the supplied heat exchange medium, and set B0(B1, B2, B3, B4), where B1 is the first preset flow rate of the supplied heat exchange medium, B2 is the second preset flow rate of the supplied heat exchange medium, B3 is the third preset flow rate of the supplied heat exchange medium, and B4 is the fourth preset flow rate of the supplied heat exchange medium, and B1 < B2 < B3 < B4; The flow rate of the supplied heat exchange medium is set according to the relationship between the range value H of the temperature difference data and the flow rate of the supplied heat exchange medium: When H < H1, the flow rate B4 of the first preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium. When H1≤H<H2, the flow rate B3 of the second preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium. When H2≤H<H3, the flow rate B2 of the third preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium. When H3≤H<H4, the flow rate B1 of the fourth preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium.

4. The flue gas and water recovery device for a thermal power plant boiler according to claim 1, characterized in that, The temperature data detected by the temperature detection component three is the flue gas exhaust temperature data; When controlling the flow rate of the internal heat exchange medium of the heat exchange mechanism according to the range of flue gas discharge temperature data, the range value F of the flue gas discharge temperature data is determined, and the range value matrix F0 of the flue gas discharge temperature data is preset. F0 (F1, F2, F3, F4) is set, where F1 is the first preset range value of flue gas discharge temperature data, F2 is the second preset range value of flue gas discharge temperature data, F3 is the third preset range value of flue gas discharge temperature data, F4 is the fourth preset range value of flue gas discharge temperature data, and F1 < F2 < F3 < F4. Determine the velocity range D of the supplied heat exchange medium, preset the velocity matrix D0 of the supplied heat exchange medium, and set D0(D1, D2, D3, D4), where D1 is the first preset velocity of the supplied heat exchange medium, D2 is the second preset velocity of the supplied heat exchange medium, D3 is the third preset velocity of the supplied heat exchange medium, and D4 is the fourth preset velocity of the supplied heat exchange medium, and D1 < D2 < D3 < D4; The flow rate of the supplied heat exchange medium is set according to the relationship between the range value F of the flue gas discharge temperature data and the flow rate of the supplied heat exchange medium: When F < F1, the flow rate D1 of the first preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium. When F1≤F<F2, the flow rate D2 of the second preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium; When F2≤F<F3, the flow rate D3 of the third preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium; When F3≤F<F4, the flow rate D4 of the fourth preset supply heat exchange medium is selected as the flow rate of the supply heat exchange medium.

5. A flue gas and water recovery device for a thermal power plant boiler according to claim 1, characterized in that, The humidity data detected by the humidity detection component is the humidity data of the exhaust gas; When controlling the circulation speed of the liquid desiccant in the dehumidification mechanism based on the range value of the flue gas exhaust humidity data, the range value S of the flue gas exhaust humidity data is determined, and a preset range value matrix S0 of the flue gas exhaust humidity data is set, with S0 (S1, S2, S3, S4), where S1 is the first preset range value of the flue gas exhaust humidity data, S2 is the second preset range value of the flue gas exhaust humidity data, S3 is the third preset range value of the flue gas exhaust humidity data, and S4 is the fourth preset range value of the flue gas exhaust humidity data, and S1 < S2 < S3 < S4. Determine the circulation speed range E of the liquid desiccant, preset the circulation speed matrix E0 of the liquid desiccant, and set E0 (E1, E2, E3, E4), where E1 is the first preset circulation speed of the liquid desiccant, E2 is the second preset circulation speed of the liquid desiccant, E3 is the third preset circulation speed of the liquid desiccant, and E4 is the fourth preset circulation speed of the liquid desiccant, and E1 < E2 < E3 < E4; The circulation speed of the liquid desiccant is set according to the relationship between the range value S of the flue gas exhaust humidity data and the circulation speed of the liquid desiccant: When S < S1, the circulation speed E1 of the first preset liquid desiccant is selected as the circulation speed of the liquid desiccant. When S1≤S<S2, the circulation speed E2 of the second preset liquid desiccant is selected as the circulation speed of the liquid desiccant. When S2≤S<S3, the circulation speed E3 of the third preset liquid desiccant is selected as the circulation speed of the liquid desiccant. When S3≤S<S4, the circulation speed E4 of the fourth preset liquid desiccant is selected as the circulation speed of the liquid desiccant.

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