Automatic control system of feed water preheater

Abstract

The utility model particularly relates to the technical field of feed water preheating, and discloses an automatic control system of a feed water preheater, which comprises a radial feed water preheater and a circulating water tank, a smoke outlet flue is inserted into the top end of the radial feed water preheater, and a smoke inlet flue is inserted into the end part of the radial feed water preheater close to the circulating water tank. A water inlet main pipe is inserted into the side wall of the radial water supply preheater, a water outlet main pipe is inserted into the side wall, close to the lower portion of the water inlet main pipe, of the radial water supply preheater, and a first bypass pipe is inserted into the bottom end of the water inlet main pipe. According to the utility model, through the electromagnetic valve I, the flowmeter I, the electromagnetic valve II, the electromagnetic valve III and the electromagnetic valve IV, the electromagnetic valve I and the electromagnetic valve IV are opened in sequence and are matched, so that the convenience of cold water filling and hot water discharging of the radial water supply preheater is improved, and an operator can open the electromagnetic valve II to mix part of hot water flowing out with the filled cold water; therefore, the precision and efficiency of internal temperature control are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of water supply preheating, especially relates to a water supply preheater automatic control system. BACKGROUND

[0002] Dry quenching is a method for cooling red coke by inert gas. In the dry quenching process, the red coke is loaded from the top of the dry quenching furnace, the low-temperature inert gas is blown into the red coke layer in the cooling section of the dry quenching furnace by the circulating fan, and the sensible heat of the red coke is absorbed. The cooled coke is discharged from the bottom of the dry quenching furnace. The high-temperature inert gas flows through the dry quenching boiler for heat exchange to produce steam, and the cooled inert gas is blown into the dry quenching furnace by the circulating fan again. The inert gas is circulated in the closed system. In the process of dry quenching, the water supply preheater is used to heat the inert gas, thereby reducing the temperature difference and improving the stability of dry quenching.

[0003] The water supply preheater is a heat exchange equipment. The water temperature is heated by the boiler, and the hot water exchanges heat with the circulating inert gas in the water supply preheater, thereby realizing preheating. The water supply preheater recovers the waste heat of the flue gas discharged from the dry quenching or other heat sources to heat the water entering the boiler, thereby reducing fuel consumption and emissions. In the operation process of dry quenching, in order to protect the corrosion of the heat exchange tube of the water supply preheater, the inlet temperature of the dry quenching furnace needs to be controlled at 115-130℃. However, the inlet temperature of the dry quenching furnace is constantly changing under different designs of the dry quenching device and different types of coke produced. In order to ensure the stability of the inlet temperature of the dry quenching furnace, the water inlet valve of the water supply preheater needs to be adjusted at any time.

[0004] The existing water supply preheater water side inlet valve, outlet valve and bypass valve are all manual valves. When the inlet temperature of the dry quenching furnace changes, the adjustment is relatively lagging, and the degree of automation is low, thereby affecting the control precision and efficiency of the water supply preheater. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of water supply preheater automatic control system, to solve the problem that the existing water supply preheater water side inlet valve, outlet valve and bypass valve are all manual valves, when the inlet temperature of the dry quenching furnace changes, the adjustment is relatively lagging, and the degree of automation is low, thereby affecting the control precision and efficiency of the water supply preheater.

[0006] The utility model discloses a kind of automatic control systems of feedwater preheater, including radial feedwater preheater and circulating water tank, the top end of radial feedwater preheater is inserted with flue, the end of radial feedwater preheater close to circulating water tank is inserted with flue inlet, the sidewall of radial feedwater preheater is inserted with water inlet main pipe, the sidewall below of radial feedwater preheater close to water inlet main pipe is inserted with water outlet main pipe, the bottom end of water inlet main pipe is inserted with bypass pipe one, the outer surface of water inlet main pipe close to bypass pipe one is equipped with solenoid valve one, the middle of bypass pipe one is equipped with solenoid valve three, bypass pipe two is fixed on the sidewall of bypass pipe one, the middle of bypass pipe two is equipped with solenoid valve two, the sidewall above of bypass pipe two close to solenoid valve two is equipped with flowmeter one, the outer surface of water outlet main pipe close to bypass pipe one is equipped with solenoid valve four, the sidewall of radial feedwater preheater away from water inlet main pipe is equipped with PLC controller.

[0007] Preferably, the end of the radial feedwater preheater close to the flue inlet is inserted with an exhaust pipe, the other end of the exhaust pipe is inserted into the sidewall of the circulating water tank, the exhaust pipe is in communication with the inside of the radial feedwater preheater and the circulating water tank in sequence, facilitating exhaust vibration reduction.

[0008] Preferably, the solenoid valve one, flowmeter one, solenoid valve two, solenoid valve three and solenoid valve four are coupled with the PLC controller in sequence, improving the convenience of control.

[0009] Preferably, the sidewall of the water inlet main pipe close to the solenoid valve one is equipped with flowmeter three, the flowmeter three is coupled with the PLC controller through wires, improving the accuracy of water inlet.

[0010] Preferably, the bypass pipe two is U-shaped, the two ends of the bypass pipe two are in communication with the bypass pipe one in sequence, and the pipe diameter of the bypass pipe one is DN50.

[0011] Preferably, the sidewall of the water outlet main pipe close to the solenoid valve four is fixedly equipped with flowmeter two, the flowmeter two is coupled with the PLC controller, improving the accuracy of water outlet.

[0012] Preferably, the middle of the exhaust pipe is equipped with solenoid valve six, and the solenoid valve six is coupled with the PLC controller.

[0013] Preferably, the bottom end of the bypass pipe one is inserted into the top end of the water outlet main pipe, the pipe diameter of the bypass pipe one and the water outlet main pipe is the same, the sidewall of the water outlet main pipe is inserted with a drain pipe, the other end of the drain pipe is in communication with the inside of the circulating water tank, the middle of the drain pipe is equipped with solenoid valve five, and the solenoid valve five is coupled with the PLC controller.

[0014] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0015] Firstly, through electromagnetic valve one, flowmeter one, electromagnetic valve two, electromagnetic valve three and electromagnetic valve four, electromagnetic valve one and electromagnetic valve four are opened in turn to improve the convenience of cold water filling and hot water discharging of the radial feed water preheater, and the operator can mix the hot water flowing out with the cold water filled in by opening electromagnetic valve two, so that the precision and efficiency of internal temperature control are improved; secondly, when electromagnetic valve one and electromagnetic valve four are closed at the same time, the operator can open electromagnetic valve six to discharge the gas into the inside of the circulating water tank when the internal temperature rises and the gas pressure changes, so that the internal vibration of the radial feed water preheater is reduced, and the stability of gas heating is improved; finally, through the setting of the drain pipe and electromagnetic valve five, the excess hot water heated in the radial feed water preheater can be transported into the inside of the circulating water tank for dry rubber quenching, so that the utilization rate of hot water is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a front view of the utility model.

[0017] Fig. 2 It is a side view of the utility model.

[0018] Fig. 3 It is a side view of the radial feed water preheater of the utility model.

[0019] The figure mark is: 1, radial feed water preheater;2, water inlet main pipe;3, electromagnetic valve one;4, circulating water tank;5, bypass pipe one;6, bypass pipe two;7, flowmeter one;8, electromagnetic valve two;9, electromagnetic valve three;10, water outlet main pipe;11, electromagnetic valve four;12, flue;13, flue;14, flowmeter two;15, drain pipe;16, electromagnetic valve five;17, exhaust pipe;18, electromagnetic valve six;19, flowmeter three;20, PLC controller. DETAILED DESCRIPTION

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the description and claims of this application as well as the above enclosed drawing figures are not intended to limit the scope of the application to the specific embodiments described herein; the terms "including" and "comprising" and any variations thereof herein are intended to cover both the inclusive and exclusive cases; the terms "first", "second", and "third" used in the description and in the claims of the application as well as above enclosed drawing figures are used for distinguishing between similar objects and not necessarily for describing a specific sequential or chronological order.

[0021] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all

[0022] See Figs. 1-3The present invention provides an embodiment of an automatic control system for a feedwater preheater, comprising a radial feedwater preheater 1 and a circulating water tank 4. The circulating water tank 4 is installed inside a dry quenching coke oven for water supply. Dry quenching coke ovens are existing technology and will not be described in detail here. A flue gas outlet 12 is inserted into the top of the radial feedwater preheater 1, and a flue gas inlet 13 is inserted into the end of the radial feedwater preheater 1 near the circulating water tank 4. The flue gas inlet 13 and the flue gas outlet 12 are connected by pipes inside the radial feedwater preheater 1. A boiler is installed inside the radial feedwater preheater 1 to heat hot water. The hot water indirectly contacts an inert gas, thereby achieving gas preheating treatment. A main inlet pipe 2 is inserted into the side wall of the radial water preheater 1 for adding water. The main inlet pipe 2 is connected to the interior of the radial water preheater 1 via a water pump. A main outlet pipe 10 is inserted into the side wall of the radial water preheater 1 near the bottom of the main inlet pipe 2. The bottom end of bypass pipe 1 5 is inserted into the top end of the main outlet pipe 10. Bypass pipe 2 6 is U-shaped, and its two ends are connected to bypass pipe 1 5 in sequence. The diameter of bypass pipe 1 5 is DN50. The diameter of bypass pipe 1 5 and the main outlet pipe 10 are the same. The main outlet pipe 10 is connected to the interior of the radial water preheater 1 via a water pump to discharge hot water. The bottom end of the main inlet pipe 2 is connected to bypass pipe 1 5. A solenoid valve 3 is installed near the outer surface of bypass pipe 5 via a flange connection. A solenoid valve 9 is installed in the middle of bypass pipe 5 via a flange connection. A bypass pipe 6 is fixed to the side wall of bypass pipe 5. A solenoid valve 8 is installed in the middle of bypass pipe 6 via a flange connection. A flow meter 7 is installed on the side wall of bypass pipe 6 near the solenoid valve 8 via a flange connection. A solenoid valve 11 is installed on the main outlet pipe 10 near the outer surface of bypass pipe 5 via a flange connection. A PLC controller 20 is fixed on the side wall of the radial water preheater 1 away from the main inlet pipe 2. The PLC controller 20 is connected in sequence to solenoid valve 3 and flow meter 7. The coupling of solenoid valves 2 (8), 3 (9), and 4 (11) improves the convenience of control. The operator replaces the manual valves originally installed inside the inlet main pipe 2, bypass pipe 1 (5), and outlet main pipe 10 with solenoid valves 1 (3), 3 (9), and 4 (11) in sequence. When it is necessary to control the temperature of the inert gas, the operator can open solenoid valves 1 (3) and 4 (11) in sequence to add cold water to achieve cooling. Secondly, by opening solenoid valve 2 (8), hot water circulation can be achieved, which facilitates the hot water circulation heating inside the radial water preheater 1. Flow meter 7 can accurately calculate the flow rate, thereby improving the efficiency and accuracy of galvanizing gas heating control.

[0023] The radial water preheater 1 is inserted with an exhaust pipe 17 near the end of the smoke inlet 13, the other end of the exhaust pipe 17 is inserted on the side wall of the circulating water tank 4, the exhaust pipe 17 is connected with the inside of the radial water preheater 1 and the circulating water tank 4 in turn, the middle of the exhaust pipe 17 is installed with an electromagnetic valve 18, the electromagnetic valve 18 is coupled with the PLC controller 20, when the electromagnetic valve 1 and the electromagnetic valve 4 are closed at the same time, the internal temperature rises, the gas pressure changes, the operator can open the electromagnetic valve 18 to discharge the gas into the inside of the circulating water tank 4, so as to reduce the vibration in the radial water preheater 1, so as to improve the stability of the gas heating.

[0024] The water inlet main pipe 2 is installed with a flowmeter 19 near the side wall of the electromagnetic valve 1, the flowmeter 19 is coupled with the PLC controller 20 through the wire, the water inlet precision is improved, the water outlet main pipe 10 is fixedly provided with a flowmeter 14 near the side wall of the electromagnetic valve 4, the flowmeter 14 is coupled with the PLC controller 20, the excess hot water in the radial water preheater 1 is discharged into the inside of the circulating water tank 4 to be used for dry quenching coke by opening the electromagnetic valve 5, so as to improve the utilization rate of the hot water.

[0025] The side wall of the water outlet main pipe 10 is inserted with a drain pipe 15, the other end of the drain pipe 15 is connected with the inside of the circulating water tank 4, the middle of the drain pipe 15 is installed with an electromagnetic valve 5, the electromagnetic valve 5 is coupled with the PLC controller 20.

[0026] Working principle: when the water preheater automatic control system is used, the operator first connects the power supply, the smoke outlet 12 is connected with the dry quenching coke oven inlet through the pipeline, when the inert gas enters the inside of the radial water preheater 1 through the smoke inlet 13, the radial water preheater 1 exchanges heat with the inert gas through the heated hot water, so as to realize the gas preheating, the preheated gas is discharged from the smoke outlet 12 into the dry quenching coke oven, so as to reduce the temperature difference change of the pipeline connection and improve the stability of the dry quenching coke, because the dry quenching coke is running, in order to protect the corrosion of the water preheater heat exchange pipe, the inlet temperature of the dry quenching coke oven needs to be controlled at 115-130℃, but the inlet temperature of the dry quenching coke oven also changes constantly under the condition of different design of the dry quenching coke device and different production of coke, the operator changes the manual valve originally installed in the inside of the water inlet main pipe 2, the bypass pipe 1 and the water outlet main pipe 10 into the electromagnetic valve 1, the electromagnetic valve 3 and the electromagnetic valve 4 in turn, when the inert gas temperature needs to be controlled, the operator can open the electromagnetic valve 1 and the electromagnetic valve 4 in turn to add cold water to realize the temperature reduction, secondly, the hot water circulation is realized by opening the electromagnetic valve 2, so as to facilitate the hot water circulation heating in the radial water preheater 1, the flowmeter 1 can accurately calculate the flow, so as to improve the efficiency and precision of the galvanized gas heating control.

[0027] Secondly, when the electromagnetic valve 3 and the electromagnetic valve 4 11 are closed at the same time, the internal temperature rises, the gas pressure changes, and the operator can open the electromagnetic valve 6 18 to discharge the gas into the inside of the circulating water tank 4, thereby reducing the vibration inside the radial feed water preheater 1, thereby improving the stability of the gas heating.

[0028] Finally, the operator can open the electromagnetic valve 5 16 to transport the excess hot water heated inside the radial feed water preheater 1 to the inside of the circulating water tank 4 for dry rubber quenching, thereby improving the utilization rate of hot water.

[0029] It should be noted that for the foregoing embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other order or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily necessary for the present application.

[0030] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented by other means. For example, the device embodiments described above are only illustrative, for example, the division of the above units, actual implementation can have another division method, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the coupling or communication connection between the displayed or discussed each other can be through some interface, indirect coupling or communication connection between devices or units, which can be electrical or other forms.

[0031] The units described above as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or they can be distributed on multiple network units. According to actual needs, some or all of the units can be selected to achieve the purpose of the embodiment scheme.

[0032] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Obviously, the described examples are only some of the embodiments of the present application, not all the embodiments. Based on these examples, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application. Although the present application has been described in detail with reference to the above examples, those of ordinary skill in the art can still combine, add or delete the features in the embodiments of the present application according to the circumstances without creative labor, so as to obtain different other technical solutions which do not deviate from the concept of the present application in essence, and these technical solutions also fall within the scope of the present application.

Claims

1. An automatic control system for a water preheater, characterized in that, It includes a radial water preheater (1) and a circulating water tank (4): the top of the radial water preheater (1) is connected to a flue (12), the end of the radial water preheater (1) near the circulating water tank (4) is connected to a flue (13), a main water inlet pipe (2) is connected to the side wall of the radial water preheater (1), a main water outlet pipe (10) is connected to the side wall of the radial water preheater (1) near the bottom of the main water inlet pipe (2), a bypass pipe (5) is connected to the bottom of the main water inlet pipe (2), and the outer side of the main water inlet pipe (2) near the bypass pipe (5) A solenoid valve 1 (3) is installed on the surface. A solenoid valve 3 (9) is installed in the middle of the bypass pipe 1 (5). A bypass pipe 2 (6) is fixed on the side wall of the bypass pipe 1 (5). A solenoid valve 2 (8) is installed in the middle of the bypass pipe 2 (6). A flow meter 1 (7) is installed on the side wall of the bypass pipe 2 (6) near the top of the solenoid valve 2 (8). A solenoid valve 4 (11) is installed on the outer surface of the main water outlet pipe (10) near the bypass pipe 1 (5). A PLC controller (20) is fixed on the side wall of the radial water supply preheater (1) away from the main water inlet pipe (2).

2. The automatic control system for a water preheater according to claim 1, characterized in that: The radial water preheater (1) has an exhaust pipe (17) inserted at the end near the flue (13). The other end of the exhaust pipe (17) is inserted into the side wall of the circulating water tank (4). The exhaust pipe (17) is connected to the interior of the radial water preheater (1) and the circulating water tank (4) in sequence.

3. The automatic control system for a water preheater according to claim 2, characterized in that: The solenoid valve 1 (3), flow meter 1 (7), solenoid valve 2 (8), solenoid valve 3 (9) and solenoid valve 4 (11) are sequentially coupled to the PLC controller (20).

4. The automatic control system for a water preheater according to claim 3, characterized in that: A flow meter (19) is installed on the side wall of the main water inlet pipe (2) near the solenoid valve (3). The flow meter (19) is coupled to the PLC controller (20) via a wire.

5. The automatic control system for a water preheater according to claim 1, characterized in that: The second bypass pipe (6) is U-shaped, and its two ends are connected to the first bypass pipe (5) in sequence. The diameter of the first bypass pipe (5) is DN50.

6. The automatic control system for a water preheater according to claim 1, characterized in that: A flow meter 2 (14) is fixed on the side wall of the main water outlet pipe (10) near the solenoid valve 4 (11), and the flow meter 2 (14) is coupled to the PLC controller (20).

7. The automatic control system for a water preheater according to claim 2, characterized in that: A solenoid valve six (18) is installed in the middle of the exhaust pipe (17), and the solenoid valve six (18) is coupled to the PLC controller (20).

8. The automatic control system for a water preheater according to claim 1, characterized in that: The bottom end of the bypass pipe (5) is inserted into the top end of the main outlet pipe (10). The bypass pipe (5) and the main outlet pipe (10) have the same diameter. A drain pipe (15) is inserted into the side wall of the main outlet pipe (10). The other end of the drain pipe (15) is connected to the inside of the circulating water tank (4). A solenoid valve (16) is installed in the middle of the drain pipe (15). The solenoid valve (16) is coupled to the PLC controller (20).

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