CN113551220A - Based on boiler waste heat recovery utilizes system - Google Patents
Based on boiler waste heat recovery utilizes system Download PDFInfo
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- CN113551220A CN113551220A CN202110832739.9A CN202110832739A CN113551220A CN 113551220 A CN113551220 A CN 113551220A CN 202110832739 A CN202110832739 A CN 202110832739A CN 113551220 A CN113551220 A CN 113551220A
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- temperature
- control module
- central control
- blowdown
- heat exchange
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/54—De-sludging or blow-down devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/56—Boiler cleaning control devices, e.g. for ascertaining proper duration of boiler blow-down
- F22B37/565—Blow-down control, e.g. for ascertaining proper duration of boiler blow-down
Abstract
The invention relates to a boiler waste heat recycling system, which comprises a continuous blowdown expander, a first stop valve, a deaerating tank, a second stop valve, a heat exchange water tank, an opening valve, a drain valve, a water inlet electromagnetic valve, a blowdown valve, a third stop valve, a hot water pump, a liquid level meter, a water temperature sensor, a temperature measuring device, a temperature compensator and a central control module. According to the invention, the pipeline is arranged on the emptying pipe of the continuous exhaust expander and is connected with the heat exchange water tank and the deaerator, the flow direction of the blowdown surplus steam is adjusted through controlling the temperature of the blowdown surplus steam, the opening valve opening is adjusted through detecting the water temperature and the water level in the heat exchange water tank, the opening valve opening is verified and adjusted through detecting the segmented time length temperature, the heating process of the heat exchange water tank is controlled more accurately while the blowdown surplus steam energy is fully utilized, the normal operation of the boiler surplus heat recycling system is ensured, and the energy consumption is reduced.
Description
Technical Field
The invention relates to the technical field of heating equipment systems, in particular to a boiler waste heat recycling system.
Background
The boiler is an energy conversion device, the energy input to the boiler comprises chemical energy and electric energy in fuel, the boiler outputs steam, high-temperature water or an organic heat carrier with certain heat energy, the origin of the boiler refers to a water container heated on fire, the boiler refers to a place where the fuel is combusted, the boiler comprises a boiler and a boiler, hot water or steam generated in the boiler can directly provide heat energy required for industrial production and people life, and can also be converted into mechanical energy through a steam power device, or can be converted into electric energy through a generator, the boiler for providing hot water is called a hot water boiler and is mainly used for life, and a small amount of application is realized in industrial production; the boiler for generating steam is called as a steam boiler, often called as a boiler for short, and is widely used for thermal power stations, ships, locomotives and industrial and mining enterprises.
In a boiler heat energy operation system, continuous pollution discharge is carried out on the water level surface of a boiler barrel due to the requirement of boiler water quality, the temperature of the residual steam is high, and the residual steam is discharged through a continuous pollution discharge expander, so that the heat loss of the discharged residual steam is huge.
Disclosure of Invention
Therefore, the invention provides a boiler waste heat recycling system which is used for solving the problem of huge heat loss in the boiler pollution discharge process in the prior art.
In order to achieve the above objects, the present invention provides a system for recycling waste heat of a boiler, comprising,
the continuous blowdown expander is connected with an external boiler blowdown system, and the external boiler blowdown system continuously blowdown the water level surface of the boiler drum through the continuous blowdown expander;
the first stop valve is connected with the continuous blowdown expander through a pipeline and used for controlling the blowdown residual steam output in the continuous blowdown expander;
the deoxygenation box is connected with the first stop valve through a pipeline, and boiler feed water in the deoxygenation box is heated to be deoxygenated through blowdown residual steam in the continuous blowdown expander;
the second stop valve is arranged between the first stop valve and the deoxidizing box and used for controlling the input of blowdown residual steam of the deoxidizing box;
the heat exchange water tank is connected with the first stop valve through a pipeline, and the heat exchange coil in the heat exchange water tank is heated through the output of the blowdown residual steam in the continuous blowdown expander, so that the water in the heat exchange water tank is heated, and the water temperature is improved;
the opening valve is arranged between the first stop valve and the heat exchange water tank and used for adjusting the input quantity of blowdown residual steam of the heat exchange water tank;
the drain valve is connected with the heat exchange coil in the heat exchange water tank and is used for discharging condensed water, air and carbon dioxide gas in a pipeline and preventing leakage of residual waste steam of sewage discharge;
the water inlet electromagnetic valve is connected with the heat exchange water tank and used for controlling water inlet of the heat exchange water tank;
the blowdown valve is connected with the heat exchange water tank and used for discharging scale and sludge accumulated in the heat exchange water tank, and the blowdown valve can discharge residual water when the heat exchange water tank is cleaned;
the third stop valve is connected with the heat exchange water tank and used for controlling the output of hot water in the heat exchange water tank;
the hot water pump is connected with the third stop valve and is used for conveying the water heated in the heat exchange water tank to an external hot water pipeline;
the liquid level meter is arranged inside the heat exchange water tank, is positioned on the side wall of the heat exchange water tank and is used for detecting the water level in the heat exchange water tank;
the water temperature sensor is arranged in the heat exchange water tank, is positioned on the side wall of the heat exchange water tank and is used for detecting the water temperature in the heat exchange water tank;
the temperature measuring device is arranged between the continuous blowdown expander and the first stop valve and is used for detecting the temperature of blowdown residual steam output by the continuous blowdown expander;
the temperature compensator is arranged at the input end of the deoxidizing box and is used for heating and compensating the deoxidizing box when the temperature of the blowdown residual steam input by the deoxidizing box is insufficient;
the central control module is connected with the first stop valve, the second stop valve, the opening valve, the water inlet electromagnetic valve, the third stop valve, the liquid level meter, the water temperature sensor, the temperature measuring device and the temperature compensator respectively and used for adjusting the working states of all the components;
when the external boiler blow-down system blows down the sewage into the continuous blow-down expander, the temperature measuring device detects the temperature of the blow-down residual steam and transmits the result to the central control module, the central control module is internally provided with the lowest recovery temperature, the central control module compares the temperature of the blow-down residual steam with the lowest recovery temperature, and a first stop valve is controlled according to the temperature of the blow-down residual steam and the lowest recovery temperature;
the central control module is internally provided with a standard heat exchange temperature required by the heat exchange water tank, when the central control module judges that the temperature of the blowdown residual steam is higher than the lowest recovery temperature, the central control module compares the temperature of the blowdown residual steam with the standard heat exchange temperature, and if the temperature of the blowdown residual steam reaches the standard heat exchange temperature, the central control module opens the opening valve to input the blowdown residual steam into the heat exchange water tank; if the temperature of the blowdown residual steam does not reach the standard heat exchange temperature, the central control module opens the second stop valve and inputs the blowdown residual steam into the deoxidizing box;
the opening degree of the opening valve is adjustable, and when the opening degree valve is opened, the central control module adjusts the opening degree valve for the first time according to the difference value between the real-time water level and the standard water level; the central control module adjusts the opening valve for the second time according to the difference value between the real-time water temperature and the standard cold water temperature; the central control module verifies the open valve adjusting node through the difference value between the segmented time length temperature rise and the temperature rise standard value, and adjusts the open degree of the open valve again according to the verification result until the standard heating state is reached;
the central control module is internally provided with standard deoxidizing temperature required by the deoxidizing box, when the second stop valve is opened, the temperature measuring device detects the temperature of the blowdown residual steam, the central control module compares the temperature of the blowdown residual steam with the standard deoxidizing temperature, and if the temperature of the blowdown residual steam reaches the standard deoxidizing temperature, the deoxidizing box is completely supplied with energy by the blowdown residual steam; and if the temperature of the residual exhaust gas in the sewage discharge does not reach the standard deoxidizing temperature, the deoxidizing box is compensated by the temperature compensator.
Further, when the external boiler sewage system discharges sewage through the continuous sewage expander, the temperature measuring device detects the temperature Tc of the residual steam of the sewage in the continuous sewage expander and transmits the result to the central control module, the central control module is provided with a minimum recovery temperature Td, and the central control module compares the temperature Tc of the residual steam of the sewage in the continuous sewage expander with the minimum recovery temperature Td:
when Tc is less than Td, the central control module judges that the temperature of the blowdown residual steam in the continuous blowdown expander does not reach the recycling standard, the central control module detects the state of a first stop valve, if the first stop valve is in an opening state, the central control module controls the first stop valve to be closed, and if the first stop valve is in a closing state, the central control module does not execute operation;
when Tc is larger than or equal to Td, the central control module judges that the temperature of the blowdown residual steam in the continuous blowdown expander reaches the recycling standard, the central control module controls the first stop valve to be opened, and the blowdown residual steam in the continuous blowdown expander enters the pipeline.
Further, when Tc is larger than or equal to Td, the central control module opens the first stop valve, the standard heat exchange temperature Th required by the heat exchange water tank is arranged in the central control module, and the central control module judges the temperature Tc of the blowdown residual steam in the continuous blowdown expander again:
when Tc is less than Th, the central control module judges that the temperature of the residual exhaust gas in the sewage discharge does not reach the standard heat exchange temperature required by the heat exchange water tank, and the central control module opens a second stop valve to enable the residual exhaust gas in the sewage discharge to enter the interior of the deoxidizing box for deoxidizing by the deoxidizing box;
when Tc is larger than or equal to Th, the central control module judges that the temperature of the blowdown residual steam reaches the standard heat exchange temperature required by the heat exchange water tank, and the central control module opens an opening valve to enable the blowdown residual steam to enter the heat exchange water tank to heat water in the heat exchange water tank.
Further, the central control module is internally provided with the standard water level Hb of the heat exchange water tank, the central control module is internally provided with the initial opening X of the opening valve, and when the water level in the heat exchange water tank is the standard water level Hb, the opening required for heating the water in the heat exchange water tank is the initial opening X of the opening valve; when Tc is more than or equal to Th, the central control module judges that the temperature of the blowdown residual steam reaches the standard heat exchange temperature required by the heat exchange water tank, the central control module opens the opening valve, the liquid level meter detects that the real-time water level in the heat exchange water tank is Hs, the result is transmitted to the central control module, the central control module adjusts the opening of the opening valve to X' according to the water level difference by calculating the real-time water level and the standard water level difference,
when Hs is larger than Hb, X' ═ 1+ (Hs-Hb)/Hb ] × X + P, wherein P is a water level adjusting opening degree compensation parameter;
when Hs < Hb, X' ═ {1- (Hb-Hs)/Hb } × X + P.
Furthermore, a standard cold water temperature Wb and a standard hot water temperature Wr of a heat exchange water tank are arranged in the central control module, when the central control module adjusts the opening degree of the opening valve to X 'according to the water level difference, the water temperature sensor detects the real-time water temperature Ws in the heat exchange water tank and transmits the result to the central control module, the central control module adjusts the opening degree of the opening valve to X' according to the water temperature difference by calculating the temperature difference between the real-time water temperature and the standard cold water temperature,
when Ws is larger than Wb, X ═ {1- (Ws-Wb)/(Wr-Wb) } × X' + Q is a water temperature adjusting opening degree compensation parameter;
when Ws < Wb, X ″ {1+ (Wb-Ws)/(Wr-Wb) } × X' + Q.
Furthermore, a temperature measuring subsection time length t and a temperature lifting standard value Wq passing through the single subsection time length t are arranged in the central control module, when the central control module adjusts the opening degree to X ' according to the water temperature difference and passes through the time length t, the water temperature sensor detects the real-time water temperature Ws ' at the moment, the detection result is transmitted to the central control module, the central control module calculates the temperature difference value Wp between Ws ' and Ws, the Wp is an actual temperature lifting value, the central control module compares the actual temperature lifting value with the temperature lifting standard value,
when Wp is larger than or equal to Wq, the central control module judges that the actual temperature increase value of the water in the heat exchange water tank reaches a temperature increase standard value, and the central control module does not adjust the opening of the opening valve;
when Wp is smaller than Wq, the central control module judges that the actual temperature increase value of water in the heat exchange water tank does not reach a temperature increase standard value, the central control module calculates the difference value between the actual temperature increase value and the temperature increase standard value, and adjusts the opening of the opening valve to Xp according to the difference value, wherein Xp is [1+ (Ws + Wq-Ws ')/(Ws + Wq) ] × X' + C, and C is a sectional adjustment opening compensation parameter.
Further, when the central control module adjusts the opening degree of the opening valve to Xp according to the temperature rise difference value and passes through the time length t, the water temperature sensor detects the real-time water temperature Ws ', the detection result is transmitted to the central control module, the central control module calculates the temperature difference value Wp' between Ws 'and Ws, the Wp' is an actual temperature rise value, the central control module compares the actual temperature rise value with a temperature rise standard value,
when Wp' is more than or equal to Wq, the central control module judges that the actual temperature increase value of the water in the heat exchange water tank reaches a temperature increase standard value, and the central control module does not adjust the opening of the opening valve;
when Wp 'is less than Wq, the central control module judges that the actual temperature lifting value of the water in the heat exchange water tank does not reach a temperature lifting standard value, and repeats the operation of adjusting the opening degree of the opening valve by the temperature difference until Wp' is more than or equal to Wq and stops adjusting.
Further, when Tc is larger than or equal to Td and Tc is smaller than Th, the central control module judges that the temperature of the residual exhaust gas discharged from the continuous sewage discharge expander reaches the recycling standard but does not reach the standard heat exchange temperature required by the heat exchange water tank, the central control module opens the second stop valve to enable the residual exhaust gas discharged from the continuous sewage discharge expander to enter the interior of the deoxidizing tank, a deoxidizing temperature standard value Tm is arranged in the central control module, and the central control module adjusts the power of the temperature compensator by calculating the difference value between the deoxidizing temperature standard value Tm and the residual exhaust gas temperature Tc discharged from the continuous sewage discharge expander.
Further, when Tc is less than Td, the central control module judges that the temperature of the blowdown residual steam in the continuous blowdown expander does not reach the recycling standard, the first stop valve is in a closed state at the moment, no blowdown residual steam enters the inside of the oxygen removing box, and the oxygen removing temperature required by the oxygen removing box is completely supplied with energy by the temperature compensator.
Further, the value of the initial opening degree X is determined according to the blow-off residual steam temperature Tc, and a first preset initial opening degree value X1, a second preset initial opening degree value X2, a third preset initial opening degree value X3, a first preset blow-off residual steam temperature value T1 and a second preset blow-off residual steam temperature value T2 are arranged in the central control module; when the central control module judges that the temperature of the blowdown residual steam reaches the standard heat exchange temperature required by the heat exchange water tank, the central control module compares the temperature Tc of the blowdown residual steam with a first preset temperature T1 and a second preset temperature T2 of the blowdown residual steam,
when Tc is less than or equal to T1, the central control module selects a first preset initial opening value X1 as an initial opening X;
when T1 is more than Tc and less than or equal to T2, the central control module selects a second preset initial opening value X2 as an initial opening X;
when Tc is more than T1, the central control module selects a third preset initial opening value X3 as the initial opening X.
Compared with the prior art, the invention has the beneficial effects that in the boiler waste heat recycling system, the continuous blowdown expander emptying pipe is provided with a pipeline which is connected and communicated with the heat exchange water tank and the deoxidizing tank, each control part and detection part are adjusted in real time by the central control module, when the central control module detects that the temperature of blowdown residual steam reaches the lowest recovery temperature, the central control module controls the first stop valve to enable the blowdown residual steam to enter the waste heat recycling system, at the moment, the central control module judges the temperature of the blowdown residual steam again, and if the temperature is lower than the standard heat exchange temperature, the blowdown residual steam enters the deoxidizing tank through adjustment to deoxidize the deoxidizing tank; if the temperature is higher than the standard heat exchange temperature, the blowdown residual steam enters the heat exchange water tank through adjusting the opening valve, the low-temperature tap water in the heat exchange water tank is heated, the water temperature and the water level in the heat exchange water tank are detected through the central control module, the opening of the opening valve is adjusted in real time, the heat of the blowdown residual steam is more efficiently and reasonably utilized, the recycling of effective energy is realized, and the energy consumption is reduced.
Further, when the external boiler sewage system discharges sewage into the continuous sewage expander, the temperature measuring device detects the temperature Tc of the residual steam of the sewage in the continuous sewage expander, the central control module is provided with a minimum recovery temperature Td, and the central control module compares the temperature Tc of the residual steam of the sewage in the continuous sewage expander with the minimum recovery temperature Td: when Tc is smaller than Td, the central control module judges that the temperature of the blowdown residual steam does not reach the recycling standard, the heat conversion generated by the blowdown residual steam heat is not enough to support the energy consumed by the control and adjustment of the recycling system, and the central control module closes the recycling system by adjusting the first stop valve, so that unnecessary energy waste is avoided; when Tc is larger than or equal to Td, the central control module judges that the temperature of the blowdown residual steam in the continuous blowdown expander reaches the recycling standard, the central control module controls the first stop valve to be opened, and the recycling system recycles the blowdown residual steam to prevent energy waste.
Further, when the blowdown residual steam enters the recycling system, the central control module is internally provided with the standard heat exchange temperature Th required by the heat exchange water tank, and the central control module judges the blowdown residual steam temperature Tc in the continuous blowdown expander again: when Tc is smaller than Th, the central control module judges that the temperature of the residual exhaust gas in the blowdown does not reach the standard heat exchange temperature required by the heat exchange water tank, and the central control module enables the residual exhaust gas in the blowdown to enter the deoxidizing box through adjustment so as to deoxidize the deoxidizing box; when Tc is more than or equal to Th, the central control module judges that the temperature of the blowdown residual steam reaches the standard heat exchange temperature required by the heat exchange water tank, the central control module enables the blowdown residual steam to enter the heat exchange water tank through adjustment so as to heat water in the heat exchange water tank, and the energy conversion of the blowdown residual steam is maximized through further judgment and adjustment of the central control module, so that energy consumption is reduced.
Particularly, the central control module is internally provided with the standard water level Hb of the heat exchange water tank, the central control module is internally provided with the initial opening X of the opening valve, and when the water level in the heat exchange water tank is the standard water level Hb, the opening required for heating the water in the heat exchange water tank is the initial opening X of the opening valve; work as well accuse module judges that blowdown residual steam temperature reaches during the required standard heat transfer temperature of heat transfer water tank, well accuse module is opened the opening valve, the real-time water level in the level gauge detection heat transfer water tank is Hs to transmit the result to well accuse module, well accuse module is through calculating real-time water level and standard water level difference, and adjust the opening valve aperture to X 'according to the water level difference, well accuse is to the detection of the real-time water level of water tank, control opening valve aperture, and the heat input of control blowdown residual steam has both ensured heat transfer water tank's normal operating, has reduced the consumption of the energy again.
Furthermore, a standard cold water temperature Wb and a standard hot water temperature Wr of a heat exchange water tank are arranged in the central control module, when the central control module adjusts the opening degree of the opening valve to X ' according to the water level difference, the water temperature sensor detects the real-time water temperature Ws in the heat exchange water tank and transmits the result to the central control module, the central control module detects the real-time water temperature in the heat exchange water tank and adjusts the opening degree of the opening valve to X ' according to the calculated difference between the real-time water temperature and the standard cold water temperature and adjusts the opening degree of the opening valve to X ' according to the water temperature difference, after the opening degree is adjusted according to the water level, the initial water temperature in the heat exchange water tank is different due to weather and seasons, the real-time water temperature in the heat exchange water tank is detected, the opening degree of the opening valve is adjusted, the heating process of the heat exchange water tank is controlled more accurately, energy conversion is utilized to the maximum, and energy consumption is reduced.
Furthermore, a temperature measuring subsection time length t and a temperature lifting standard value Wq passing through the single subsection time length t are arranged in the central control module, when the central control module adjusts the opening degree to X ' according to the water temperature difference and after the time length t, the water temperature sensor detects the real-time water temperature Ws ' at the moment, the detection result is transmitted to the central control module, the central control module calculates the temperature difference value Wp between Ws ' and Ws, the Wp is an actual temperature increase value, the central control module compares the actual temperature increase value with a temperature increase standard value and judges whether the opening degree of the opening valve needs to be adjusted or not, when the opening valve needs to be adjusted, the opening of the opening valve is adjusted to Xp, the adjustment degree of the opening is verified through real-time water temperature detection after a certain time length, when the opening valve does not meet the standard opening requirement, the opening of the opening valve is further adjusted, so that the heating process of the heat exchange water tank can normally run.
Further, when the central control module adjusts the opening degree of the opening valve to Xp according to the temperature rise difference value, and after the time period t passes, the water temperature sensor detects the real-time water temperature Ws at the moment, the detection result is transmitted to the central control module, the central control module calculates the temperature difference value Wp ' between Ws ' and Ws, the Wp ' is an actual temperature rise value, the central control module compares the actual temperature rise value with a temperature rise standard value, rechecks the opening degree of the opening valve, when the opening valve does not meet the standard opening requirement at the moment, the rechecking is repeated, the opening degree of the opening valve is adjusted until the opening degree of the opening valve meets the standard opening requirement at the moment, and through repeated check adjustment, the heating process of the heat exchange water tank is controlled more accurately, and the normal operation of the heat exchange water tank is guaranteed.
Especially, work as well accuse module judges blowdown residual steam temperature in the continuous blowdown expander has reached the recycle standard, nevertheless does not reach the required standard heat transfer temperature of heat transfer water tank, well accuse module is opened the second stop valve makes the blowdown residual steam get into inside the deoxidization case, be equipped with deoxidization temperature standard value Tm in the well accuse module, well accuse module is through calculating deoxidization temperature standard value Tm and blowdown residual steam temperature Tc's difference, and the regulation temperature compensator carries out temperature compensation, and reasonable control energy flows to, makes the energy utilization maximize, has reduced the consumption of the energy.
Further, when the central control module judges that the blowdown residual steam temperature in the continuous blowdown expander does not reach the recycle standard, at this moment the first stop valve is in the closed state, and no blowdown residual steam enters inside the deoxidization case, the required deoxidization temperature of deoxidization case by the complete energy supply of temperature compensator has ensured the normal operating of deoxidization case under the condition of no blowdown residual steam input.
Particularly, the value of the initial opening degree X is determined according to the blow-off residual steam temperature Tc, and a first preset initial opening degree value X1, a second preset initial opening degree value X2, a third preset initial opening degree value X3, a first preset blow-off residual steam temperature value T1 and a second preset blow-off residual steam temperature value T2 are arranged in the central control module; when the central control module judges that the temperature of the blowdown residual steam reaches the standard heat exchange temperature required by the heat exchange water tank, the central control module compares the temperature Tc of the blowdown residual steam with a first preset blowdown residual steam temperature value T1 and a second preset blowdown residual steam temperature value T2, selects the initial opening of the opening valve through comparing the temperature range where the blowdown residual steam is located, further controls the heating process of the heat exchange water tank, improves the heating precision of the heat exchange water tank and reduces the energy consumption.
Drawings
FIG. 1 is a schematic structural diagram of a boiler waste heat recycling system according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Please refer to fig. 1, which is a schematic structural diagram of a boiler waste heat recycling system according to the present invention, and the present invention discloses a boiler waste heat recycling system, which includes a continuous blowdown expander 1, a first stop valve 2, an oxygen removing tank 3, a second stop valve 4, a heat exchange water tank 5, an opening valve 6, a drain valve 7, a water inlet solenoid valve 8, a blowdown valve 9, a third stop valve 10, a hot water pump 11, a liquid level meter 12, a water temperature sensor 13, a temperature measuring device 14, a temperature compensator 15, and a central control module (not shown in the figure), wherein,
the continuous blowdown expander 1 is connected with an external boiler blowdown system, and the external boiler blowdown system continuously blowdown the water level surface of the boiler drum through the continuous blowdown expander 1;
the first stop valve 2 is connected with the continuous blowdown expander 1 through a pipeline and used for controlling the blowdown residual steam output in the continuous blowdown expander 1;
the deoxygenation tank 3 is connected with the first stop valve 2 through a pipeline, and is used for heating boiler feed water in the deoxygenation tank 3 through blowdown residual steam in the continuous blowdown expander 1 to deoxygenate;
the second stop valve 4 is arranged between the first stop valve 2 and the deoxidizing box 3 and is used for controlling the input of blowdown residual steam of the deoxidizing box 3;
the heat exchange water tank 5 is connected with the first stop valve 2 through a pipeline, and the heat exchange coil in the heat exchange water tank 5 is heated through the output of the blowdown residual steam in the continuous blowdown expander 1, so that the water in the heat exchange water tank 5 is heated, and the water temperature is improved;
the opening valve 6 is arranged between the first stop valve 2 and the heat exchange water tank 5 and is used for adjusting the input amount of blowdown residual steam of the heat exchange water tank 5;
the drain valve 7 is connected with the heat exchange coil in the heat exchange water tank 5 and is used for discharging condensed water, air and carbon dioxide gas in a pipeline and preventing leakage of residual waste steam of sewage discharge;
the water inlet electromagnetic valve 8 is connected with the heat exchange water tank 5 and is used for controlling water inlet of the heat exchange water tank 5;
a blowoff valve 9 connected to the heat exchange water tank 5 for discharging scale and sludge accumulated in the heat exchange water tank 5, the blowoff valve 9 being capable of discharging surplus water when the heat exchange water tank 5 is cleaned;
a third stop valve 10 connected to the heat exchange water tank 5 for controlling the output of the hot water in the heat exchange water tank 5;
a hot water pump 11 connected to the third stop valve 10 for delivering the heated water in the heat exchange water tank 5 to an external hot water pipe;
a liquid level meter 12 disposed inside the heat exchange water tank 5 on a side wall of the heat exchange water tank 5 to detect a water level inside the heat exchange water tank 5;
the water temperature sensor 13 is arranged inside the heat exchange water tank 5, is positioned on the side wall of the heat exchange water tank 5 and is used for detecting the water temperature in the heat exchange water tank 5;
the temperature measuring device 14 is arranged between the continuous blowdown expander 1 and the first stop valve 2 and is used for detecting the temperature of blowdown residual steam output by the continuous blowdown expander 1;
the temperature compensator 15 is arranged at the input end of the deoxidizing box 3, and when the temperature of the blowdown residual steam input by the deoxidizing box 3 is insufficient, the temperature compensator 15 performs heating compensation on the deoxidizing box 3;
the central control module is connected with the first stop valve 2, the second stop valve 4, the opening valve 6, the water inlet electromagnetic valve 8, the third stop valve 10, the liquid level meter 12, the water temperature sensor 13, the temperature measuring device 14 and the temperature compensator 15 respectively and used for adjusting the working states of all the components;
when the external boiler blow-down system blows down the sewage into the continuous blow-down expander 1, the temperature measuring device 14 detects the temperature of the blow-down residual steam and transmits the result to the central control module, the lowest recovery temperature is arranged in the central control module, the central control module compares the temperature of the blow-down residual steam with the lowest recovery temperature, and the first stop valve 2 is controlled according to the temperature of the blow-down residual steam and the lowest recovery temperature;
the central control module is internally provided with a standard heat exchange temperature required by the heat exchange water tank 5, when the central control module judges that the temperature of the blowdown residual steam is higher than the lowest recovery temperature, the central control module compares the temperature of the blowdown residual steam with the standard heat exchange temperature, and if the temperature of the blowdown residual steam reaches the standard heat exchange temperature, the central control module opens the opening valve 6 and inputs the blowdown residual steam into the heat exchange water tank 5; if the temperature of the blowdown residual steam does not reach the standard heat exchange temperature, the central control module opens the second stop valve 4 and inputs the blowdown residual steam into the deaerating box 3;
the opening degree of the opening valve 6 can be adjusted, and when the opening valve 6 is opened, the central control module adjusts the opening valve 6 for the first time through the difference value between the real-time water level and the standard water level; the central control module adjusts the opening valve 6 for the second time according to the difference value between the real-time water temperature and the standard cold water temperature; the central control module verifies the adjusting node of the open valve 6 through the difference value between the segmented time length temperature rise and the temperature rise standard value, and adjusts the open degree of the open valve 6 again according to the verification result until the standard heating state is achieved;
the central control module is internally provided with standard deoxidizing temperature required by the deoxidizing box 3, when the second stop valve 4 is opened, the temperature measuring device 14 detects the temperature of the blowdown residual steam, the central control module compares the temperature of the blowdown residual steam with the standard deoxidizing temperature, and if the temperature of the blowdown residual steam reaches the standard deoxidizing temperature, the blowdown residual steam completely supplies energy to the deoxidizing box 3; if the temperature of the exhaust gas does not reach the standard deoxidizing temperature, the deoxidizing box 3 is compensated by the temperature compensator 15.
In the boiler waste heat recycling system, a pipeline is arranged on a drain pipe of a continuous blowdown expansion 1 device, the pipeline is connected and led to a heat exchange water tank 5 and a deoxidizing tank 3, each control part and each detection part are adjusted in real time by a central control module, when the central control module detects that the temperature of blowdown waste steam reaches the lowest recovery temperature, the central control module controls a first stop valve 2 to enable the blowdown waste steam to enter the waste heat recycling system, the central control module judges the temperature of the blowdown waste steam again at the moment, and if the temperature is lower than the standard heat exchange temperature, the blowdown waste steam enters the deoxidizing tank 3 through adjustment to deoxidize the deoxidizing tank 3; if the temperature is higher than the standard heat exchange temperature, the blowdown residual steam enters the heat exchange water tank 5 by adjusting the opening valve 6 so as to heat low-temperature water in the heat exchange water tank 5, the opening of the opening valve 3 is adjusted in real time by detecting the water temperature and water level in the heat exchange water tank 5 through the central control module, the heat of the blowdown residual steam is more efficiently and reasonably utilized, the recycling of effective energy is realized, and the energy consumption is reduced.
When the external boiler blow-down system performs blow-down through the continuous blow-down expander 1, the temperature measuring device 14 detects the temperature Tc of blow-down residual steam in the continuous blow-down expander 1 and transmits the result to the central control module, the central control module is internally provided with the lowest recovery temperature Td, and the central control module compares the temperature Tc of blow-down residual steam in the continuous blow-down expander 1 with the lowest recovery temperature Td:
when Tc is less than Td, the central control module judges that the temperature of the blowdown residual steam in the continuous blowdown expander 1 does not reach the recycling standard, detects the state of the first stop valve 2, controls the first stop valve 2 to be closed if the first stop valve 2 is in an open state, and does not perform operation if the first stop valve 2 is in a closed state;
when Tc is larger than or equal to Td, the central control module judges that the temperature of the blowdown residual steam in the continuous blowdown expander 1 reaches the recycling standard, the central control module controls the first stop valve 2 to be opened, and the blowdown residual steam in the continuous blowdown expander 1 enters the pipeline.
When Tc is more than or equal to Td, the central control module opens the first stop valve 2, the standard heat exchange temperature Th required by the heat exchange water tank 5 is set in the central control module, and the central control module judges the temperature Tc of the blowdown residual steam in the continuous blowdown expander 1 again:
when Tc is less than Th, the central control module judges that the temperature of the residual exhaust gas in the sewage discharge does not reach the standard heat exchange temperature required by the heat exchange water tank 5, and the central control module opens the second stop valve 4 to enable the residual exhaust gas in the sewage discharge to enter the deoxidizing box 3 for deoxidizing the deoxidizing box 3;
when Tc is larger than or equal to Th, the central control module judges that the temperature of the waste gas discharged from the sewage reaches the standard heat exchange temperature required by the heat exchange water tank 5, the central control module opens the opening valve 6 to enable the waste gas discharged from the sewage to enter the heat exchange water tank 5 to heat water in the heat exchange water tank 5, and the energy conversion of the waste gas discharged from the sewage is maximized through further judgment and adjustment of the central control module, so that the energy consumption is reduced.
The central control module is internally provided with a standard water level Hb of the heat exchange water tank 5, the central control module is internally provided with an initial opening X of the opening valve 6, and when the water level in the heat exchange water tank 5 is the standard water level Hb, the opening required for heating water in the heat exchange water tank 5 is the initial opening X of the opening valve 6; when Tc is more than or equal to Th, the central control module judges that the temperature of the residual exhaust gas of the sewage reaches the standard heat exchange temperature required by the heat exchange water tank 5, the central control module opens the opening valve 6, the liquid level meter 12 detects that the real-time water level in the heat exchange water tank 5 is Hs, the result is transmitted to the central control module, the central control module adjusts the opening of the opening valve 6 to X' according to the water level difference by calculating the real-time water level and the standard water level difference,
when Hs is larger than Hb, X' ═ 1+ (Hs-Hb)/Hb ] × X + P, wherein P is a water level adjusting opening degree compensation parameter;
when Hs < Hb, X' ═ {1- (Hb-Hs)/Hb } × X + P. The central control module is internally provided with a standard cold water temperature Wb and a standard hot water temperature Wr of a heat exchange water tank 5, when the central control module adjusts the opening of the opening valve 6 to X 'according to the water level difference, the water temperature sensor 13 detects the real-time water temperature Ws in the heat exchange water tank 5 and transmits the result to the central control module, the central control module adjusts the opening of the opening valve 6 to X' by calculating the temperature difference between the real-time water temperature and the standard cold water temperature and according to the water temperature difference,
when Ws is larger than Wb, X ═ {1- (Ws-Wb)/(Wr-Wb) } × X' + Q is a water temperature adjusting opening degree compensation parameter;
when Ws < Wb, X ″ {1+ (Wb-Ws)/(Wr-Wb) } × X' + Q.
The central control module is internally provided with a temperature measuring subsection time length t and a temperature lifting standard value Wq passing through the single subsection time length t, when the central control module adjusts the opening degree to X ' according to the water temperature difference and passes through the time length t, the water temperature sensor 13 detects the real-time water temperature Ws ' at the moment, the detection result is transmitted to the central control module, the central control module calculates the temperature difference value Wp between the Ws ' and the Ws, the Wp is an actual temperature lifting value, the central control module compares the actual temperature lifting value with the temperature lifting standard value,
when Wp is larger than or equal to Wq, the central control module judges that the actual temperature increase value of the water in the heat exchange water tank 5 reaches a temperature increase standard value, and the central control module does not adjust the opening of the opening valve 6;
when Wp is smaller than Wq, the central control module judges that the actual temperature increase value of the water in the heat exchange water tank 5 does not reach a temperature increase standard value, the central control module calculates the difference value between the actual temperature increase value and the temperature increase standard value, and adjusts the opening of the opening valve 6 to Xp according to the difference value, wherein Xp is [1+ (Ws + Wq-Ws ')/(Ws + Wq) ] × X' + C, and C is a sectional adjustment opening compensation parameter.
When the central control module adjusts the opening degree of the opening degree valve 6 to Xp according to the temperature lifting difference value and passes through the time length t, the water temperature sensor 13 detects the real-time water temperature Ws at the moment, the detection result is transmitted to the central control module, the central control module calculates the temperature difference value Wp ' between Ws ' and Ws, the Wp ' is an actual temperature lifting value, the central control module compares the actual temperature lifting value with a temperature lifting standard value,
when Wp' is more than or equal to Wq, the central control module judges that the actual temperature increase value of the water in the heat exchange water tank 5 reaches a temperature increase standard value, and the central control module does not adjust the opening of the opening valve 6;
when Wp 'is less than Wq, the central control module judges that the actual temperature lifting value of water in the heat exchange water tank 5 does not reach a temperature lifting standard value, the temperature difference is repeated to adjust the opening of the opening valve 6 until Wp' is more than or equal to Wq, the adjustment is stopped, the check is repeated, the opening of the opening valve is adjusted until the opening of the opening valve meets the standard opening requirement, the heating process of the heat exchange water tank 5 is controlled more accurately through repeated check adjustment, and the normal operation of the heat exchange water tank is guaranteed.
When Tc is larger than or equal to Td and Tc is smaller than Th, the central control module judges that the temperature of the residual exhaust gas discharged from the continuous sewage discharge expander 1 reaches the recycling standard but does not reach the standard heat exchange temperature required by the heat exchange water tank 5, the central control module opens the second stop valve 4 to enable the residual exhaust gas discharged from the continuous sewage discharge expander to enter the interior of the deoxidizing tank 3, a deoxidizing temperature standard value Tm is arranged in the central control module, and the central control module adjusts the temperature compensator 15 to perform temperature compensation by calculating the difference value between the deoxidizing temperature standard value Tm and the residual exhaust gas temperature Tc, so that the energy flow direction is reasonably controlled, the energy utilization is maximized, and the energy consumption is reduced.
When Tc < Td, the central control module judges that the temperature of the residual sewage steam in the continuous sewage expander 1 does not reach the recycling standard, the first stop valve 2 is in a closed state at the moment, no residual sewage steam enters the inside of the deoxidizing box 3, the deoxidizing temperature required by the deoxidizing box 3 is completely supplied with energy by the temperature compensator 15, and the normal operation of the deoxidizing box 3 is ensured under the condition of no input of the residual sewage steam.
The numerical value of the initial opening X is determined according to the blowdown residual steam temperature Tc, and a first preset initial opening value X1, a second preset initial opening value X2, a third preset initial opening value X3, a first preset blowdown residual steam temperature value T1 and a second preset blowdown residual steam temperature value T2 are arranged in the central control module; when the central control module judges that the temperature of the blowdown residual steam reaches the standard heat exchange temperature required by the heat exchange water tank 5, the central control module compares the temperature Tc of the blowdown residual steam with a first preset temperature T1 of the blowdown residual steam and a second preset temperature T2 of the blowdown residual steam,
when Tc is less than or equal to T1, the central control module selects a first preset initial opening value X1 as an initial opening X;
when T1 is more than Tc and less than or equal to T2, the central control module selects a second preset initial opening value X2 as an initial opening X;
when Tc is more than T1, the central control module selects a third preset initial opening value X3 as the initial opening X. Through the temperature interval at contrast blowdown steam residue place, select the initial aperture of aperture valve 6, further control heat exchange water tank 5's heating process improves heat exchange water tank 5 heating accuracy, reduces the consumption of the energy.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A boiler waste heat recycling system is characterized by comprising,
the continuous blowdown expander is connected with an external boiler blowdown system, and the external boiler blowdown system continuously blowdown the water level surface of the boiler drum through the continuous blowdown expander;
the first stop valve is connected with the continuous blowdown expander through a pipeline and used for controlling the blowdown residual steam output in the continuous blowdown expander;
the deoxygenation box is connected with the first stop valve through a pipeline, and boiler feed water in the deoxygenation box is heated to be deoxygenated through blowdown residual steam in the continuous blowdown expander;
the second stop valve is arranged between the first stop valve and the deoxidizing box and used for controlling the input of blowdown residual steam of the deoxidizing box;
the heat exchange water tank is connected with the first stop valve through a pipeline, and the heat exchange coil in the heat exchange water tank is heated through the output of the blowdown residual steam in the continuous blowdown expander, so that the water in the heat exchange water tank is heated, and the water temperature is improved;
the opening valve is arranged between the first stop valve and the heat exchange water tank and used for adjusting the input quantity of blowdown residual steam of the heat exchange water tank;
the drain valve is connected with the heat exchange coil in the heat exchange water tank and is used for discharging condensed water, air and carbon dioxide gas in a pipeline and preventing leakage of residual waste steam of sewage discharge;
the water inlet electromagnetic valve is connected with the heat exchange water tank and used for controlling water inlet of the heat exchange water tank;
the blowdown valve is connected with the heat exchange water tank and used for discharging scale and sludge accumulated in the heat exchange water tank, and the blowdown valve can discharge residual water when the heat exchange water tank is cleaned;
the third stop valve is connected with the heat exchange water tank and used for controlling the output of hot water in the heat exchange water tank;
the hot water pump is connected with the third stop valve and is used for conveying the water heated in the heat exchange water tank to an external hot water pipeline;
the liquid level meter is arranged inside the heat exchange water tank, is positioned on the side wall of the heat exchange water tank and is used for detecting the water level in the heat exchange water tank;
the water temperature sensor is arranged in the heat exchange water tank, is positioned on the side wall of the heat exchange water tank and is used for detecting the water temperature in the heat exchange water tank;
the temperature measuring device is arranged between the continuous blowdown expander and the first stop valve and is used for detecting the temperature of blowdown residual steam output by the continuous blowdown expander;
the temperature compensator is arranged at the input end of the deoxidizing box and is used for heating and compensating the deoxidizing box when the temperature of the blowdown residual steam input by the deoxidizing box is insufficient;
the central control module is connected with the first stop valve, the second stop valve, the opening valve, the water inlet electromagnetic valve, the third stop valve, the liquid level meter, the water temperature sensor, the temperature measuring device and the temperature compensator respectively and used for adjusting the working states of all the components;
when the external boiler blow-down system blows down the sewage into the continuous blow-down expander, the temperature measuring device detects the temperature of the blow-down residual steam and transmits the result to the central control module, the central control module is internally provided with the lowest recovery temperature, the central control module compares the temperature of the blow-down residual steam with the lowest recovery temperature, and a first stop valve is controlled according to the temperature of the blow-down residual steam and the lowest recovery temperature;
the central control module is internally provided with a standard heat exchange temperature required by the heat exchange water tank, when the central control module judges that the temperature of the blowdown residual steam is higher than the lowest recovery temperature, the central control module compares the temperature of the blowdown residual steam with the standard heat exchange temperature, and if the temperature of the blowdown residual steam reaches the standard heat exchange temperature, the central control module opens the opening valve to input the blowdown residual steam into the heat exchange water tank; if the temperature of the blowdown residual steam does not reach the standard heat exchange temperature, the central control module opens the second stop valve and inputs the blowdown residual steam into the deoxidizing box;
the opening degree of the opening valve is adjustable, and when the opening degree valve is opened, the central control module adjusts the opening degree valve for the first time according to the difference value between the real-time water level and the standard water level; the central control module adjusts the opening valve for the second time according to the difference value between the real-time water temperature and the standard cold water temperature; the central control module verifies the open valve adjusting node through the difference value between the segmented time length temperature rise and the temperature rise standard value, and adjusts the open degree of the open valve again according to the verification result until the standard heating state is reached;
the central control module is internally provided with standard deoxidizing temperature required by the deoxidizing box, when the second stop valve is opened, the temperature measuring device detects the temperature of the blowdown residual steam, the central control module compares the temperature of the blowdown residual steam with the standard deoxidizing temperature, and if the temperature of the blowdown residual steam reaches the standard deoxidizing temperature, the deoxidizing box is completely supplied with energy by the blowdown residual steam; and if the temperature of the residual exhaust gas in the sewage discharge does not reach the standard deoxidizing temperature, the deoxidizing box is compensated by the temperature compensator.
2. The boiler waste heat recovery and utilization system according to claim 1, wherein when the external boiler blowdown system discharges blowdown through the continuous blowdown expander, the temperature measuring device detects a temperature Tc of blowdown exhaust steam in the continuous blowdown expander and transmits the result to the central control module, a minimum recovery temperature Td is set in the central control module, and the central control module compares the blowdown exhaust steam temperature Tc in the continuous blowdown expander with the minimum recovery temperature Td:
when Tc is less than Td, the central control module judges that the temperature of the blowdown residual steam in the continuous blowdown expander does not reach the recycling standard at the moment, the central control module detects the state of a first stop valve, if the first stop valve is in an opening state, the central control module controls the first stop valve to be closed, and if the first stop valve is in a closing state, the central control module does not perform operation;
when Tc is larger than or equal to Td, the central control module judges that the temperature of the blowdown residual steam in the continuous blowdown expander reaches the recycling standard, the central control module controls the first stop valve to be opened, and the blowdown residual steam in the continuous blowdown expander enters the pipeline.
3. The boiler waste heat recycling system according to claim 2, wherein when Tc is greater than or equal to Td, the central control module opens the first cut-off valve, a standard heat exchange temperature Th required by the heat exchange water tank is set in the central control module, and the central control module determines the temperature Tc of the blowdown waste steam in the continuous blowdown expander again:
when Tc is less than Th, the central control module judges that the temperature of the residual exhaust gas in the sewage discharge does not reach the standard heat exchange temperature required by the heat exchange water tank, and the central control module opens a second stop valve to enable the residual exhaust gas in the sewage discharge to enter the interior of the deoxidizing box for deoxidizing by the deoxidizing box;
when Tc is larger than or equal to Th, the central control module judges that the temperature of the blowdown residual steam reaches the standard heat exchange temperature required by the heat exchange water tank, and the central control module opens an opening valve to enable the blowdown residual steam to enter the heat exchange water tank to heat water in the heat exchange water tank.
4. The boiler waste heat recycling system according to claim 3, wherein the heat exchange water tank standard water level Hb is provided in the central control module, the opening valve initial opening degree X is provided in the central control module, and when the water level in the heat exchange water tank is the standard water level Hb, the opening degree required for heating the water in the heat exchange water tank is the opening valve initial opening degree X; when Tc is more than or equal to Th, the central control module judges that the temperature of the blowdown residual steam reaches the standard heat exchange temperature required by the heat exchange water tank, the central control module opens the opening valve, the liquid level meter detects that the real-time water level in the heat exchange water tank is Hs, the result is transmitted to the central control module, the central control module adjusts the opening of the opening valve to X' according to the water level difference by calculating the real-time water level and the standard water level difference,
when Hs is larger than Hb, X' ═ 1+ (Hs-Hb)/Hb ] × X + P, wherein P is a water level adjusting opening degree compensation parameter;
when Hs < Hb, X' ═ {1- (Hb-Hs)/Hb } × X + P.
5. The boiler waste heat recycling system according to claim 4, wherein a standard cold water temperature Wb and a standard hot water temperature Wr of a heat exchange water tank are provided in the central control module, when the central control module adjusts the opening of the opening valve to X 'according to the water level difference, the water temperature sensor detects the real-time water temperature Ws in the heat exchange water tank and transmits the result to the central control module, and the central control module adjusts the opening of the opening valve to X' according to the water temperature difference by calculating the temperature difference between the real-time water temperature and the standard cold water temperature,
when Ws is larger than Wb, X ═ {1- (Ws-Wb)/(Wr-Wb) } × X' + Q is a water temperature adjusting opening degree compensation parameter;
when Ws < Wb, X ″ {1+ (Wb-Ws)/(Wr-Wb) } × X' + Q.
6. The boiler waste heat recycling system according to claim 5, wherein a temperature measuring subsection time t and a temperature elevation standard value Wq of the time t passing through a single subsection are set in the central control module, when the central control module adjusts the opening to X "according to the water temperature difference and the time t passes, the water temperature sensor detects the real-time water temperature Ws 'at that time, the detection result is transmitted to the central control module, the central control module calculates the temperature difference value Wp between Ws' and Ws, Wp is an actual temperature elevation value, the central control module compares the actual temperature elevation value Wp with the temperature elevation standard value Wq,
when Wp is larger than or equal to Wq, the central control module judges that the actual temperature increase value of the water in the heat exchange water tank reaches a temperature increase standard value, and the central control module does not adjust the opening of the opening valve;
when Wp is smaller than Wq, the central control module judges that the actual temperature increase value of water in the heat exchange water tank does not reach a temperature increase standard value, the central control module calculates the difference value between the actual temperature increase value and the temperature increase standard value, and adjusts the opening of the opening valve to Xp according to the difference value, wherein Xp is [1+ (Ws + Wq-Ws ')/(Ws + Wq) ] × X' + C, and C is a sectional adjustment opening compensation parameter.
7. The boiler waste heat recycling system according to claim 6, wherein when the central control module adjusts the opening of the opening valve to Xp according to the temperature rise difference value and after a time period t passes, the water temperature sensor detects the real-time water temperature Ws ", the detection result is transmitted to the central control module, the central control module calculates the temperature difference value Wp 'between Ws' and Ws ', the Wp' is an actual temperature rise value, the central control module compares the actual temperature rise value with the temperature rise standard value,
when Wp' is more than or equal to Wq, the central control module judges that the actual temperature increase value of the water in the heat exchange water tank reaches a temperature increase standard value, and the central control module does not adjust the opening of the opening valve;
when Wp 'is less than Wq, the central control module judges that the actual temperature lifting value of the water in the heat exchange water tank does not reach a temperature lifting standard value, and repeats the operation of adjusting the opening degree of the opening valve by the temperature difference until Wp' is more than or equal to Wq and stops adjusting.
8. The boiler waste heat recycling system based on claim 3, wherein when Tc is larger than or equal to Td and Tc is smaller than Th, the central control module determines that the temperature of the blowdown residual steam in the continuous blowdown expander reaches the recycling standard but does not reach the standard heat exchange temperature required by the heat exchange water tank, the central control module opens the second stop valve to enable the blowdown residual steam to enter the interior of the deoxygenation tank, a deoxygenation temperature standard value Tm is arranged in the central control module, and the central control module adjusts the temperature compensator to perform temperature compensation by calculating the difference between the deoxygenation temperature standard value Tm and the blowdown residual steam temperature Tc.
9. The boiler waste heat recovery and utilization based system according to claim 8, wherein when Tc < Td, the central control module determines that the temperature of the blowdown residual steam in the continuous blowdown expander does not reach the recovery and utilization standard, the first stop valve is in a closed state, no blowdown residual steam enters the interior of the oxygen removal box, and the oxygen removal temperature required by the oxygen removal box is fully supplied with power by the temperature compensator.
10. The boiler waste heat recycling system according to claim 4, wherein the value of the initial opening degree X is determined according to the blowdown residual steam temperature Tc, and a first preset initial opening degree value X1, a second preset initial opening degree value X2, a third preset initial opening degree value X3, a first preset blowdown residual steam temperature value T1 and a second preset blowdown residual steam temperature value T2 are arranged in the central control module; when the central control module judges that the temperature of the blowdown residual steam reaches the standard heat exchange temperature required by the heat exchange water tank, the central control module compares the temperature Tc of the blowdown residual steam with a first preset temperature T1 and a second preset temperature T2 of the blowdown residual steam,
when Tc is less than or equal to T1, the central control module selects a first preset initial opening value X1 as an initial opening X;
when T1 is more than Tc and less than or equal to T2, the central control module selects a second preset initial opening value X2 as an initial opening X;
when Tc is more than T1, the central control module selects a third preset initial opening value X3 as the initial opening X.
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| CN201382399Y (en) * | 2009-04-30 | 2010-01-13 | 钮德明 | Automatic monitoring device for continuous blowdown of boiler |
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