An intelligent control system for the hardness of boiler feed water

Abstract

The present invention provides an intelligent control system for the hardness of boiler feed water, which includes a feed water tank, a water treatment device, a water hardness detection device, a discharge water tank, a control system, and a water treatment auxiliary medicine tank. The feed water tank, the water treatment device, the water hardness detection device, and the discharge water tank are connected in sequence. The control system and the water treatment auxiliary medicine tank are connected to the water treatment device, and the control system is connected to the water hardness detection device and the water treatment auxiliary medicine tank. By arranging a water hardness detection device between the water treatment device and the drainage tank, the present invention can pay attention to the water quality hardness situation at all times. At the same time, when setting the water hardness detection device, due to the arrangement of a circulation channel and an auxiliary channel, during the detection process, most of the water flows along the circulation channel to the drainage tank without affecting the normal use of boiler drainage. At the same time, a shaft-shaped sensing head inserted into the auxiliary channel is used to measure the water hardness at all times.

Description

Technical Field

[0001] The present invention relates to the field of boiler water quality detection, and particularly to an intelligent control system for the hardness of boiler feed water. Background Art

[0002] A boiler is an energy conversion device. The energy input into the boiler includes the chemical energy in fuel and electric energy. The boiler outputs steam, high-temperature water or organic heat carriers with a certain amount of heat energy.

[0003] The original meaning of "pot" refers to a water container heated over fire, and "furnace" refers to a place for burning fuel. A boiler includes two major parts: the pot and the furnace. The hot water or steam generated in the boiler can directly provide the required heat energy for industrial production and people's livelihood, or can be converted into mechanical energy through a steam power device, or further converted into electric energy through a generator.

[0004] A boiler that provides hot water is called a hot water boiler, which is mainly used for life and has a small amount of application in industrial production; a boiler that generates steam is called a steam boiler, often simply referred to as a boiler, and is mostly used in thermal power stations, ships, locomotives and industrial and mining enterprises.

[0005] When a boiler is used for industrial water quality detection, it is mainly used for the water quality detection of softened water, demineralized water and boiler water in the boiler. And the hardness of water quality, as an indispensable detection parameter of water quality, actually refers to the total amount of Mg2+ magnesium ions and Ca2+ calcium ions in the water body. Among them, the calcium and magnesium ions existing in the form of bicarbonates and carbonates represent the temporary hardness, and the Ca2+ and Mg2+ existing in the form of chlorides, sulfates and nitrates represent the permanent hardness. The sum of the two is the total hardness. If the water quality hardness is too high, it is easy to cause scaling on the inner wall of the boiler, block the pipeline, and even cause a boiler explosion accident.

[0006] Currently, when detecting the hardness of water quality, the commonly used method is sampling detection. By intercepting samples in the boiler and then detecting the hardness of the water quality through a hardness and alkalinity water quality detection analyzer to obtain the result. However, in actual operation, it is often rather troublesome. One is that sampling is troublesome, and the other is that the time control is not timely. Maybe after the result comes out, a part of the boiler water has been drained, so the obtained effect is not obvious. Summary of the Invention

[0007] The problem to be solved by the present invention is to provide an intelligent control system for the hardness of boiler feed water, which is helpful for detecting the hardness of water quality in the process of boiler water treatment, aiming at the above-mentioned deficiencies in the prior art.

[0008] To achieve the above object, the present invention adopts the following technical solution: An intelligent control system for the hardness of boiler feed water, comprising a water inlet tank, a water treatment device, a water hardness detection device, a water outlet tank, a control system, and a water treatment auxiliary medicine tank. The water inlet tank, the water treatment device, the water hardness detection device, and the water outlet tank are connected in sequence. The control system and the water treatment auxiliary medicine tank are connected to the water treatment device, and the control system is connected to the water hardness detection device and the water treatment auxiliary medicine tank.

[0009] Further, the control system is used to control the water treatment program of the water treatment device and the water treatment agent of the water treatment auxiliary medicine tank according to the result of the water hardness detection device.

[0010] Further, the water hardness detection device includes a pipe body and a water hardness detection sensor installed on the pipe body. Both ends of the pipe body have an inlet connection head and an outlet connection head respectively. The pipe body has a flow passage that is connected to the water treatment device and the water outlet tank through the inlet connection head and the outlet connection head at both ends respectively. The inner wall of the pipe body is provided with a plurality of auxiliary channels arranged around the flow passage, and the sensing head of the water hardness detection sensor extends into the auxiliary channel.

[0011] Further, the water hardness detection sensor includes a sensor body and a plurality of shaft-shaped sensing heads connected to the sensor body. The pipe body has a first through hole vertically communicating with the auxiliary channel, and the shaft-shaped sensing heads extend into the auxiliary channel from the first through hole.

[0012] Further, the side surface of the shaft-shaped sensing head has a first contact piece, and the sensor body has a second contact piece. The sensor body is a circular ring structure and is sleeved on the pipe body and is screwed with it. When the side surface of the sensor body contacts the limiting block provided at the upper end of the shaft-shaped sensing head, the first contact piece on the limiting block contacts the second contact piece.

[0013] Further, the pipe body is provided with a second through hole, and the second through hole vertically communicates with the auxiliary channel. A shaft is slidably connected to the second through hole, and a spring is wound around the shaft. Both ends of the spring are respectively connected to the pipe body and the shaft. The bottom of the auxiliary channel has a blind hole corresponding to the second through hole. When the sensor body compresses the spring through the shaft, the lower end of the shaft extends into the blind hole.

[0014] Further, a notch vertically communicating with the second through hole is provided on the auxiliary channel, and the notch is parallelly communicated with the auxiliary channel. A horizontal rod is provided at the upper end of the spring and can extend into the notch; a coil is arranged along the direction of the spring, the shaft is an iron rod, the coil is connected to a power supply and a single-chip microcomputer, and an iron block capable of attracting the iron rod is provided at the bottom of the blind hole.

[0015] Furthermore, the circulation channel includes a first channel and a second channel that are interconnected. The first channel and the second channel are coaxial. The inner diameter of the second channel is larger than that of the first channel. The cylinder body extends into the second channel, and the opening of the cylinder body faces the first channel. The cylinder body has a plurality of drainage through-holes, and an annular drainage channel is formed between the column body and the inner wall of the pipe body. When the left side of the cylinder body abuts against the side wall of the second channel, the first channel, the cavity of the cylinder body, the drainage through-holes, the annular drainage channel, and the water outlet connector are sequentially connected. A plurality of pistons are arranged in parallel at the right end of the cylinder body. The column body is provided with a horizontal blind channel into which the pistons can extend. The horizontal blind channel is connected to a pump through a trachea. The pump is equipped with an air outlet cavity and an air inlet cavity. The pump, the air outlet cavity, and the air inlet cavity are all arranged on the column body. A third through-hole provided on the pipe body corresponds to a plug-in hole provided on the column body. A fixing rod passes through the third through-hole and is inserted into the plug-in hole. When the cylinder body moves to the right and the drainage through-holes and the annular drainage channel are misaligned, a fourth through-hole provided on the pipe body communicates with the second channel, and the outlet of the fourth through-hole is connected to the water inlet tank through a high-pressure water pipe.

[0016] Furthermore, the control system includes a processor and a control module. The control module is connected to the power supply, the single-chip microcomputer, the pump, and the valve. The valve is arranged on the pipeline between the water treatment auxiliary medicine box and the water processor.

[0017] Furthermore, the water treatment auxiliary medicine box includes a tank body and a liquid level sensor arranged in the tank body. The tank body stores additives for changing the water hardness.

[0018] Compared with the prior art, the present invention has the following beneficial effects: By arranging a water hardness detection device between the water processor and the drainage tank, the present invention can always monitor the water quality hardness. At the same time, when setting the water hardness detection device, due to the arrangement of the circulation channel and the auxiliary channel, during the detection process, most of the water flows along the circulation channel to the drainage tank without affecting the normal use of the boiler drainage. At the same time, the shaft-shaped sensing head inserted into the auxiliary channel is used to always measure the water hardness, and then the data detected by the plurality of shaft-shaped sensing heads are integrated to judge the water quality situation.

[0019] Other advantages, objectives, and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of an intelligent control system for the hardness of boiler feed water according to the present invention.

[0021] Figure 2 It is a left side view of the pipe body according to the present invention.

[0022] Figure 3 This is a schematic structural diagram of the tube body of the present invention. Detailed implementation manners

[0023] In order to make the technical means, creative features, achieved purposes and functions of the present invention clearer and easier to understand, the present invention will be further described below in conjunction with the accompanying drawings and specific implementation manners:

[0024] The present invention provides an intelligent control system for the hardness of boiler feed water, which includes a water inlet tank 1, a water treatment device 2, a water hardness detection device 3, a water outlet tank 4, a control system 5 and a water treatment auxiliary medicine tank 6. The water inlet tank 1, the water treatment device 2, the water hardness detection device 3 and the water outlet tank 4 are connected in sequence; the adjacent two of the water inlet tank 1, the water treatment device 2, the water hardness detection device 3 and the water outlet tank 4 are connected by water pipes, and electric control valves are arranged on the water pipes and controlled by the control system 5. The control system 5 and the water treatment auxiliary medicine tank 6 are connected to the water treatment device 2, and the control system 5 is connected to the water hardness detection device 3 and the water treatment auxiliary medicine tank 6; the control system 5 is used to control the water treatment program of the water treatment device 2 and the water treatment chemicals of the water treatment auxiliary medicine tank 6 according to the result of the water hardness detection device 3; the water treatment device 2 is a prior art, and its main purpose is to control the hardness and alkalinity of the water flowing from the water inlet tank 1 to the water outlet tank 4; the water treatment device 2 is a prior art that can be controlled by a water treatment program to treat the water passing through the water treatment device 2. Its main purpose is to remove suspended solids, microorganisms, colloids, dissolved gases and some organic matters in the water, and some filters can also be added for mechanical filtration or activated carbon filtration; multiple boxes can be arranged in the water treatment auxiliary medicine tank 6 and are connected to the water treatment device 2 through water pipes. The multiple boxes are used to contain different auxiliary medicine tanks to improve the water quality, such as containing a regeneration liquid to regenerate the water.

[0025] The water hardness detection device 3 includes a pipe body and a water hardness detection sensor 13 installed on the pipe body. Both ends of the pipe body respectively have a water inlet connector 10 and a water outlet connector 9. The structures of the water inlet connector 10 and the water outlet connector 9 are symmetrical and are respectively connected to the water processor 2 on the left side and the water outlet tank 4. The water inlet connector 10 and the water outlet connector 9 respectively extend out annular connection parts 8 to the left and right for welding or screwing to connect the water processor 2 and the water outlet tank 4. When screwing, both the water processor 2 and the water outlet tank 4 are provided with screw connectors. The pipe body has a flow channel 11 that communicates with the water processor 2 and the water outlet tank 4 respectively through the water inlet connector 10 and the water outlet connector 9 at both ends. A plurality of auxiliary channels 12 are provided on the inner wall of the pipe body around the flow channel 11, and the sensing head of the water hardness detection sensor 13 extends into the auxiliary channel 12; the water hardness detection sensor 13 includes a sensor body 15 and a plurality of shaft-shaped sensing heads 14 connecting the sensor body 15. The pipe body has a first through hole vertically communicating with the auxiliary channel 12, and the shaft-shaped sensing heads 14 extend into the auxiliary channel 12 from the first through hole; by inserting the plurality of shaft-shaped sensing heads 14 into the auxiliary channel 12, the hardness of the flowing water quality is detected at the same time; at the same time, the separate setting of the sensor body 15 and the shaft-shaped sensing heads 14 helps to facilitate the replacement of the shaft-shaped sensing heads 14; the side of the shaft-shaped sensing head 14 has a first contact piece 16, and the sensor body 15 has a second contact piece. The sensor body 15 is in a circular ring structure and is sleeved on the pipe body and screwed with it. When the side of the sensor body 15 contacts the limiting block provided at the upper end of the shaft-shaped sensing head 14, the first contact piece 16 on the limiting block contacts the second contact piece; when the sensor body 15 is screwed to the right and abuts against the limiting block, the second contact piece on the sensor body 15 and the first contact piece 16 provided on the side of the limiting block contact to form an integral sensor. The sensor body 15 has a processing module and a plurality of sensing modules connecting the processing module. The sensing modules are respectively connected to the shaft-shaped sensing heads 14 through the first contact piece 16 and the second contact piece, and transmit the signals of the plurality of shaft-shaped sensing heads 14 to the processing module, and finally form a signal and transmit it to the control system 5; a connector 21 is provided at the outlet of the auxiliary channel 12. The connector 21 is connected to an auxiliary water tank 7 through a water pipe. The auxiliary water tank 7 is connected to the water inlet tank 1 and the water outlet tank 4 through a first water pipe and a second water pipe respectively. A first water valve and a second water valve are respectively provided on the first water pipe and the second water pipe. When the water quality hardness is normal, the first water valve is closed and the second water valve is opened. When the water quality hardness is abnormal, the first water valve is opened and the second water valve is closed.

[0026] One of the multiple auxiliary channels 12 is connected to a water quality hardness analyzer through a water pipe. The water quality detection port of the water quality hardness analyzer is communicated with the water pipe, and a water valve is arranged on the water pipe and connected to the control system 5 so as to control the switch through the control system 5. The water quality hardness analyzer is wirelessly communicated with the processor of the control system 5 and transmits the analysis result of the water quality hardness analyzer to the processor for control by the control system 5. The processor is equipped with a display and is connected thereto. The water quality hardness analyzer analyzes the water quality flowing into the water quality hardness analyzer from the auxiliary channel 12 through an on-line titration analysis method; the on-line titration analysis method is a titration method of the prior art.

[0027] A second perforation 17 is provided on the pipe body. The second perforation 17 is vertically communicated with the auxiliary channel 12. A shaft rod is arranged in the second perforation 17 and is slidably connected with the second perforation 17. A spring 18 is wound around the shaft rod. Two ends of the spring 18 are respectively connected to the pipe body and the shaft rod. A blind hole corresponding to the second perforation 17 is provided at the bottom of the auxiliary channel 12. When the sensor body 15 compresses the spring 18 through the shaft rod, the lower end of the shaft rod extends into the blind hole. When the sensor body 15 contacts the limiting block, the shaft rod moves upward under the action of the spring 18 and protrudes out of the second through hole 17, so as to lock the sensor body 15 between the shaft rod and the limiting block. The limiting block is located above the pipe body. The distance between the limiting block and the shaft rod is equal to the horizontal length of the sensor body 15. The sensor body 15 annularly wraps the pipe body. A spiral protrusion is provided on the outer wall of the pipe body and is spirally connected with a spiral groove provided on the inner wall of the annular sensor body 15, so that the sensor body 15 can rotate forward and backward on the pipe body, i.e., the first pipe body.

[0028] In order to facilitate the installation of the shaft rod and the spring 18, a notch 20 vertically communicated with the second perforation 17 is provided on the auxiliary channel 12. The notch is parallelly communicated with the auxiliary channel 12. A horizontal rod is provided at the upper end of the spring 18 and can extend into the notch 20. A coil is arranged along the direction of the spring 18. The shaft rod is an iron rod. The coil is connected to a power supply and a single-chip microcomputer. An iron block 19 capable of mutually attracting the iron rod is provided at the bottom of the blind hole. The spring 18 is connected to the pipe body by inserting the horizontal rod into the notch 20. When the shaft rod-shaped sensing head 14 needs to be replaced, the controller controls the coil to be powered on, so that the iron rod moves downward and is attracted to the iron block 19 in the blind hole. At the same time, the shaft rod moves downward to block the auxiliary channel 12. The inner diameter of the second perforation 17 is adapted to the shaft rod. The second perforation 17 is vertically communicated with the auxiliary channel 12. The inner diameter of the second perforation 17 is larger than the inner diameter of the auxiliary channel 12.

[0029] The flow passage 11 includes a first passage and a second passage that are interconnected. The first passage and the second passage are coaxial. The inner diameter of the second passage is larger than that of the first passage. The cylinder body 23 extends into the second passage, and the opening of the cylinder body 23 faces the first passage. The cylinder body 23 has a plurality of drainage through holes 24. An annular drainage passage 31 is formed between the column body 22 and the inner wall of the pipe body. When the left side of the cylinder body 23 abuts against the side wall of the second passage, the first passage, the cavity of the cylinder body 23, the drainage through holes 24, the annular drainage passage 31, and the water outlet connector 9 are sequentially connected. A plurality of pistons 26 are arranged in parallel at the right end of the cylinder body 23. The column body 22 is provided with a horizontal blind passage 27 into which the pistons 26 can extend. The horizontal blind passage 27 is connected to a pump 28 through an air pipe. The pump 28 is provided with an air outlet cavity 29 and an air inlet cavity 30. The pump 28, the air outlet cavity 29, and the air inlet cavity 30 are all arranged on the column body 22. A third through hole provided on the pipe body corresponds to a plug hole provided on the column body 22. A fixing rod 32 passes through the third through hole and is inserted into the plug hole. When the cylinder body 23 moves to the right and the drainage through holes 24 and the annular drainage passage 31 are misaligned, a fourth through hole 25 provided on the pipe body communicates with the second passage. The inner diameter of the second passage is equal to the outer diameter of the cylinder body 23, and the inner diameter of the cylinder body 23 is equal to the inner diameter of the first passage. The outer diameter of the piston 26 is equal to the inner diameter of the horizontal blind passage 27. An air valve connected by Bluetooth communication is provided on the air pipe. When the air valve is closed, the horizontal blind passage  27 is closed, and the right end of the piston 26 is always located within the horizontal blind passage 27.

[0030] The control system 5 includes a processor and a control module, the control module is connected to the power supply, single-chip microcomputer, pump 28 and valve and is connected by Bluetooth communication, the pump 28 and the valve are both equipped with a power module, and the valve is arranged on the pipeline between the water treatment auxiliary medicine box 6 and the water treatment device 2; the water inlet tank 1 and the water treatment device 2 are connected by a connecting water pipe, and a water valve that can be controlled by the control module is arranged on the connecting water pipe, and the connecting water pipe can be intercepted by the water valve; the processor is edited through the existing program to receive the signal detected by the water hardness detection sensor 13, and then determines whether the water hardness after passing through the water treatment device 2 meets the standard according to the signal situation, and then transmits the signal to the control module of the controller, and the controller can control the operation of the power supply, single-chip microcomputer, pump 28 and the valve; when the water quality does not meet the standard, the pump 28 works to extract the gas located in the horizontal blind path 27 and make it enter the air outlet cavity 29, under the action of water pressure , entering from the left opening of the cylinder 23 and impacting the cylinder 23, so that the drainage hole 24 and the annular drainage channel 31 are misaligned, and the water passing through the water processor 2 enters the first channel from the water inlet connector 10 and is discharged from the fourth perforation 25 set on the side wall of the second channel and then returns to the water inlet tank 1 through the high-pressure water pipe for reflux; when the water hardness is normal, the controller controls the pump 28 to replenish the air located in the air outlet chamber 29 into the horizontal blind channel 27, thereby pushing the piston 26 to move to the left, thereby driving the sealing ring 33 on the side surface of the left end portion of the cylinder 23 to press against the side of the second channel to block the fourth perforation 25 while connecting the drainage hole 24 and the annular drainage channel 31, and realize intelligent control through the mutual cooperation of the processor and control module of the control system 5 and receiving the signal of the water hardness detection sensor 13. The water hardness detection sensor 13 is a high-precision sensor in the prior art.

[0031] The water treatment auxiliary medicine box 6 includes a tank body and a liquid level sensor arranged in the tank body, and the tank body stores additives for changing water hardness; the additives are additives in the prior art that change water hardness, such as trisodium phosphate and sodium hydroxide; the tube body is formed by butt welding the first tube body 35 and the second tube body 34, and the first tube body 35 and the second tube body 34 are butt welded to form the annular drainage channel 31, which is convenient for installing the cylinder 23 and the column 22.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An intelligent control system for boiler feed water hardness, characterized by: The invention comprises a water inlet tank (1), a water treatment device (2), a water hardness detection device (3), a water outlet tank (4), a control system (5) and a water treatment auxiliary medicine box (6); the water inlet tank (1), the water treatment device (2), the water hardness detection device (3) and the water outlet tank (4) are connected in sequence; the control system (5) and the water treatment auxiliary medicine box (6) are connected to the water treatment device (2); and the control system (5) is connected to the water hardness detection device (3) and the water treatment auxiliary medicine box (6); The control system (5) is used to control the water treatment program of the water processor (2) and the water treatment chemicals in the water treatment auxiliary medicine box (6) according to the result of the water hardness detection device (3); The water hardness detection device (3) comprises a pipe body and a water hardness detection sensor (13) mounted on the pipe body, wherein the two ends of the pipe body are provided with a water inlet connector (10) and a water outlet connector (9), respectively, and the pipe body has a circulation channel (11) connected to the water treatment device (2) and the water outlet tank (4) through the water inlet connector (10) and the water outlet connector (9) at the two ends, respectively, and the inner wall of the pipe body is provided with a plurality of auxiliary channels (12) arranged around the circulation channel (11), and the sensor head of the water hardness detection sensor (13) extends into the auxiliary channel (12); The water hardness detection sensor (13) comprises a sensor body (15) and a plurality of shaft-shaped sensing heads (14) connected to the sensor body (15); the tube body has a first through-hole vertically connected to the auxiliary channel (12); the shaft-shaped sensing heads (14) extend from the first through-hole into the auxiliary channel (12); The side surface of the shaft-shaped sensor head (14) has a first contact piece (16), and the sensor body (15) has a second contact piece. The sensor body (15) is a circular ring structure and is sleeved on the tube body and screwed thereto. When the side surface of the sensor body (15) contacts a limit block provided at the upper end of the shaft-shaped sensor head (14), the first contact piece (16) on the limit block contacts the second contact piece. The tube body is provided with a second through hole (17), the second through hole (17) is vertically connected to the auxiliary channel (12), a shaft is provided in the second through hole (17) and is slidably connected to the second through hole (17), a spring (18) is wound around the shaft, and the two ends of the spring (18) are respectively connected to the tube body and the shaft, and the bottom of the auxiliary channel (12) has a blind hole corresponding to the second through hole (17), and when the sensor body (15) compresses the spring (18) through the shaft, the lower end of the shaft extends into the blind hole; The auxiliary channel (12) is provided with a notch (20) vertically connected to the second through-hole (17), and the notch is parallel to the auxiliary channel (12). The upper end of the spring (18) is provided with a horizontal rod capable of extending into the notch (20); a coil is provided along the direction of the spring (18), the shaft rod is an iron rod, the coil is connected to a power supply and a single-chip microcomputer, and the bottom of the blind hole is provided with an iron block (19) capable of attracting the iron rod.

2. The intelligent control system for boiler feed water hardness according to claim 1, characterized in that: The circulation channel (11) comprises a first channel and a second channel that are interconnected, the first channel and the second channel being coaxial, the inner diameter of the second channel being larger than that of the first channel, the cylinder (23) extending into the second channel, the opening of the cylinder (23) facing the first channel, the cylinder (23) having a plurality of drainage holes (24), and an annular drainage channel (31) formed between the column (22) and the inner wall of the tube body; when the left side of the cylinder (23) abuts against the side wall of the second channel, the first channel, the cavity of the cylinder (23), the drainage holes (24), the annular drainage channel (31) and the water outlet connector (9) are sequentially connected; a plurality of pistons (26) are arranged in parallel at the right end of the cylinder (23), and the cylinder (22) A horizontal blind path (27) is provided for the piston (26) to extend into, and the horizontal blind path (27) is connected to the pump (28) through an air pipe. The pump (28) is provided with an air outlet cavity (29) and an air inlet cavity (30). The pump (28), the air outlet cavity (29) and the air inlet cavity (30) are all provided on the column (22). A third through-hole is provided on the tube body and corresponds to the plug-in hole provided on the column (22). The fixing rod (32) passes through the third through-hole and is inserted into the plug-in hole. When the cylinder (23) moves right and the drainage hole (24) and the annular drainage channel (31) are misaligned, the fourth through-hole (25) provided on the tube body is connected to the second channel. The outlet of the fourth through-hole (25) is connected to the water inlet tank (1) through a high-pressure water pipe.

3. The intelligent control system for boiler feed water hardness according to claim 1, characterized in that: The control system (5) comprises a processor and a control module, wherein the control module is connected to the power supply, the single chip microcomputer, the pump (28) and the valve, and the valve is arranged on the pipeline between the water treatment auxiliary medicine box (6) and the water treatment device (2).

4. The intelligent control system for boiler feed water hardness according to claim 1, characterized in that: The water treatment auxiliary medicine box (6) comprises a tank body and a liquid level sensor arranged in the tank body, and the tank body stores an additive for changing water hardness.

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