Intermittent water replenishing control method for heat pump steam unit, electronic equipment and storage medium

Abstract

The invention relates to the field of high-temperature heat pumps, in particular to an intermittent water supplementing control method for a heat pump steam unit, electronic equipment and a storage medium, and the control method comprises the steps that a target value and an initial value are set; after the unit operates stably, the current moment Tm is recorded, and the steam flow ms begins to be recorded; when the liquid level of the vapor-liquid separator reaches the lowest water level # imgabs0 #, first-time water supplementing is carried out, second-time water supplementing is carried out at the time interval of t2 for the water supplementing duration of t1 (n), third-time water supplementing is carried out at the time interval of t2 for the water supplementing duration of t1 (n), and the moment is recorded as Tm + 1 until the ith-time water supplementing and the liquid level of the vapor-liquid separator reach # imgabs1 #; the average value msp (m) of the steam flow from the Tm moment to the Tm + 1 moment is calculated, and the maximum value ms (m) of the steam flow is recorded; the steam flow descending proportion xi is calculated, and if xi is smaller than or equal to a%, t1 (n) is the optimal water supplementing duration; and if xi is greater than a%, repeating the steps S2-S5 until xi is less than or equal to a%. The water replenishing flow is adjusted by optimizing the intermittent water replenishing duration, the influence of water replenishing on the steam yield is reduced, and the average air output and the heat supply capacity of the unit are improved.

Description

Technical Field

[0001] The present invention relates to the field of high-temperature heat pumps, and in particular to an intermittent water replenishment control method for a heat pump steam unit, electronic equipment, and a storage medium. Background Art

[0002] In the field of industrial heating and energy utilization, high-temperature heat pump steam generators are gaining widespread attention and application as highly efficient and energy-efficient steam supply equipment. However, in actual continuous steam supply operation, these units face a key technical challenge that needs to be addressed. Specifically, under continuous steam supply conditions, the water temperature provided by the feed water system is typically relatively low, typically around 25°C, while the steam output temperature of the unit is relatively high, typically ranging from 100 to 140°C. Due to this significant temperature difference between the feed water and steam temperatures, the low-temperature feed water absorbs a significant amount of additional heat when entering the unit to participate in steam generation. This heat includes not only the sensible heat required to raise the feed water temperature from its initial temperature to saturation, but also the latent heat of vaporization required to absorb further heat after reaching saturation, transforming the water into steam through phase change. This significant additional heat absorption prevents the unit from utilizing sufficient energy for efficient steam generation during the transient phase, significantly reducing the unit's instantaneous steam output. This phenomenon not only directly affects the heating efficiency of the entire heating system, making it impossible to fully and effectively utilize energy, but also seriously interferes with the stability of steam output, making it difficult to meet the needs of application scenarios such as industrial production that have high requirements for steam supply stability and continuity. It has become a key technical bottleneck restricting the further promotion and application of high-temperature heat pump steam units and performance improvement. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method, electronic device, and storage medium for controlling intermittent water replenishment of a heat pump steam unit, which can adjust the water replenishment flow rate by optimizing the intermittent water replenishment duration, reduce the impact of water replenishment on steam production, and improve the average gas output and heating capacity of the unit.

[0004] In a first aspect, the present invention provides a method for controlling intermittent water replenishment of a heat pump steam unit, comprising the following steps: S1: Set the maximum liquid level of the gas-liquid separator H max and minimum value H min , set the target steam pressure P s , set the water supply flow rate to m b , set the water replenishment interval to t 2. Set the water replenishment time tot 1= t 1(n) , set the initial value m =1, n =1, i =1, m is the number of steam flow, n The number of the water replenishment time, i is the number of cycles; S2: After the standby group runs stably, record the current time as T m , and start recording steam flow at the same time m s ; S3: When the liquid level of the gas-liquid separator reaches the minimum water level When the first water replenishment is carried out, the water replenishment time is t 1(n) , interval time t 2Start the second water replenishment, the water replenishment time is t 1(n) , interval time t 2 Start the third water replenishment until the i The liquid level of the gas-liquid separator reaches , record this moment as T m+1 , is the accuracy of the liquid level measurement; S4: Calculation T m Time has come T m+1 Average steam flow rate during the time m sp(m) , and record the maximum steam flow m s(m) ; S5: Calculate the steam flow rate drop ratio x i =( m s(m) - m sp(m) ) / m s(m) ,like x i ≤ a %,but t 1(n) For the best water replenishment time; if x i > a %,make m = m +1, n = n +1, i =i +1, set , repeat S2~S5 until x i ≤ a %, at the current moment t 1(n) The optimal water replenishment time is a % is the maximum allowable attenuation percentage of steam flow, The time to reduce the duration of a single water replenishment.

[0005] Preferably, the liquid level of the gas-liquid separator is detected by a liquid level monitoring device.

[0006] Preferably, water replenishment is performed by starting a water replenishment pump.

[0007] Preferably, the method for determining whether the unit is operating stably is: instantaneous steam flow rate ≥ rated steam flow rate under current operating conditions.

[0008] Preferably, a The value range of % is 3%~5%.

[0009] In a second aspect, the present invention provides a heat pump steam unit controlled by any of the above-mentioned intermittent water replenishment control methods for a heat pump steam unit.

[0010] In a third aspect, the present invention provides an electronic device comprising a processor, a network interface and a memory, wherein the processor, the network interface and the memory are interconnected, wherein the memory is used to store a computer program, the computer program comprises program instructions, and the processor is configured to call the program instructions to execute any of the intermittent water replenishment control methods for a heat pump steam unit.

[0011] In a fourth aspect, the present invention provides a computer-readable storage medium comprising a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute any of the intermittent water replenishment control methods for a heat pump steam unit.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The intermittent water replenishment control method for the heat pump steam unit described in the present invention can adjust the water replenishment flow rate by optimizing the intermittent water replenishment duration, reduce the impact of water replenishment on steam production, and improve the average gas output and heating capacity of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the heat pump steam unit described in the present invention.

[0014] Figure 2 This is a schematic diagram of the intermittent water replenishment of the heat pump steam unit described in the present invention.

[0015] Figure 3 This is a flow chart of the intermittent water replenishment control method for a heat pump steam unit according to the present invention.

[0016] Markings in the figure: 1- compressor, 2- condenser, 3- throttling device, 4- evaporator, 5- vapor-liquid separator, 6- circulating water pump, 7- feed water pump, 8- steam valve, 9- liquid level monitoring device. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments, as all technologies implemented based on the present invention fall within the scope of the present invention.

[0018] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating orientation or positional relationships such as "upper," "lower," "left," "right," "center," "inside," and "outside" are based on the orientation or positional relationships shown in the accompanying drawings, or are the orientation or positional relationships in which the invented product / device / apparatus is placed when it is conventionally used. These terms of orientation or positional relationships are merely for the purpose of facilitating the description of the present invention or simplifying the description of the specific embodiments to facilitate a quick understanding of the solutions by technicians, and do not indicate or imply that a particular device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0019] In addition, the use of terms such as "horizontal," "vertical," "overhanging," "parallel," and "coaxial" does not necessarily require that the corresponding devices / components / elements be absolutely horizontal, vertical, overhanging, parallel, or coaxial. Instead, they may be slightly tilted or have deviations, as long as they do not affect the normal function of the relevant components. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted. "Coaxial" means that the two components are arranged as coaxially as possible, so that they move in a coaxial or approximately coaxial manner when their relative positions change. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are arranged in a "horizontal," "vertical," "overhanging," "parallel," or "coaxial" direction, and can have an error / deviation of ±10% relative to the corresponding direction, more preferably within an error / deviation of ±8%, more preferably within an error / deviation of ±6%, more preferably within an error / deviation of ±5%, and more preferably within an error / deviation of ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the present invention.

[0020] In addition, the expressions “first”, “second”, “third”, etc. in the terms are merely used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0021] In addition, in the description of the embodiments of the present invention, "several," "a plurality," and "a number" represent at least two. It can also be any number such as two, three, four, five, six, seven, eight, nine, or even more than nine.

[0022] Furthermore, in the description of the technical solution of the present invention, unless otherwise expressly specified, defined, or limited, the terms "disposed," "installed," "connected," "connected," "provided with," "laid," and "arranged" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections. They may be welded, riveted, bolted, threaded, or other commonly used connection methods in the art. Such connections may be mechanical, electrical, or communicative; they may be direct, indirect via an intermediate medium, or internally connected between two components.

[0023] Example 1 like Figure 1 As shown, a heat pump steam unit mainly includes a refrigerant cycle and a water cycle. The refrigerant cycle and the water cycle exchange heat through the condenser. The refrigerant cycle mainly includes a compressor 1, a condenser 2, a throttling device 3 and an evaporator 4. The water cycle mainly includes a feed water pump 7, a condenser 2, a vapor-liquid separator 5, a circulating water pump 6, and a steam valve 8.

[0024] When the heat pump steam unit is in operation, on the refrigerant circulation side: the liquid refrigerant absorbs heat from the medium (such as water or air) in the evaporator 4 and evaporates into a gaseous state. It is then sucked into and compressed by the compressor 1, and converted into high-temperature, high-pressure refrigerant vapor at the outlet of the compressor 1. It then enters the condenser 2 to heat the circulating water and make-up water in the vapor-liquid separator 5. After cooling and condensing into a liquid state, it is throttled and reduced in pressure by the throttling device 3 and enters the evaporator 4 again to absorb heat. On the water circulation side: cold water is transported to the condenser 2 by the make-up water pump 7 for preheating, then enters the bottom of the vapor-liquid separator 5 to mix with the high-temperature hot water. The mixed high-temperature hot water is then transported to the condenser 2 again by the circulating water pump 6 to be heated. It becomes wet steam at the outlet of the condenser 2. After separation by the vapor-liquid separator 5, the saturated dry steam flows through the steam valve 8 and is transported to the user through a pipeline.

[0025] Figure 1 The heat pump cycle in the figure only shows the most basic configuration of a single-stage compression heat pump cycle, namely, including a compressor 1, a condenser 2, a throttling device 3, and an evaporator 4. The water replenishment control method described in the present invention is also applicable to other types of compression heat pump cycles, such as a two-stage compression heat pump cycle and a cascade compression heat pump cycle.

[0026] like Figure 3 As shown, a method for controlling intermittent water replenishment of a heat pump steam unit includes the following steps: S1: Set the maximum liquid level of the vapor-liquid separator 5 H max and minimum value H min , set the target steam pressure P s , set the water supply flow rate to m b , set the water replenishment interval to t 2. Set the water replenishment time to t 1= t 1(n) , set the initial value m =1, n =1, i =1, m is the number of steam flow, n The number of the water replenishment time, i is the number of cycles.

[0027] S2: After the standby group runs stably, record the current time as T m , and start recording steam flow at the same time m s In a preferred solution, the method for determining whether the unit is operating stably is: instantaneous steam flow rate ≥ rated steam flow rate under current operating conditions.

[0028] S3: The continuous output of steam causes the water level in the vapor-liquid separator 5 to drop. When the liquid level monitoring device 9 detects that the liquid level in the vapor-liquid separator 5 reaches the lowest water level, When the water supply pump 7 is started to supply water for the first time, the water supply time is t 1(n) , interval time t 2Start the second water replenishment, the water replenishment time is t 1(n) , interval time t 2 Start the third water replenishment until the i The liquid level of the gas-liquid separator reaches , record this moment as T m+1 , For the accuracy of liquid level measurement, the water supply logic of the unit is shown in Figure 2 .

[0029] S4: Simultaneous calculation T m Time has come T m+1 Average steam flow rate during the time msp(m) , and record the maximum steam flow m s(m) .

[0030] S5: Calculate the steam flow rate drop ratio x i =( m s(m) - m sp(m) ) / m s(m) ,like x i ≤ a %,but t 1(n) For the best water replenishment time; if x i > a %,make m = m +1, n = n +1, i = i +1, set , repeat S2~S5 until x i ≤ a %, at the current moment t 1(n) The optimal water replenishment time is a % is the maximum allowable attenuation percentage of steam flow, The time required to replenish water once is reduced. a The value range of % is 3%~5%.

[0031] The intermittent water replenishment control method for the heat pump steam unit described in the present invention reduces the single water replenishment time according to the feedback of the steam flow rate decrease amplitude. The water in the vapor-liquid separator 5 is replenished to the maximum liquid level through multiple water replenishments. The amount of water replenished in a single time is reduced, and the average temperature of the water after a single mixing is increased. This temperature is closer to the steam outlet temperature, the heat required for heating to vaporization is reduced, and the decrease amplitude of the unit's steam output is reduced.

[0032] The intermittent water replenishment control method for the heat pump steam unit described in the present invention can adjust the water replenishment flow rate by optimizing the intermittent water replenishment duration, reduce the impact of water replenishment on steam production, and improve the average gas output and heating capacity of the unit.

[0033] Example 2 A heat pump steam unit is controlled by the intermittent water replenishment control method for a heat pump steam unit as described in any one of the first embodiments.

[0034] Example 3 An electronic device includes a processor, a network interface and a memory, wherein the processor, the network interface and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions to execute the intermittent water replenishment control method of a heat pump steam unit as described in any one of Example 1.

[0035] Example 4 A computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the intermittent water replenishment control method for a heat pump steam unit as described in any one of Example 1.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for controlling intermittent water replenishment of a heat pump steam unit, characterized in that: The following steps are involved: S1: Set the maximum liquid level of the vapor-liquid separator (5) H max and minimum value H min , set the target steam pressure P s , set the water supply flow rate to m b , set the water replenishment interval to t 2. Set the water replenishment time to t 1= t 1(n) , set the initial value m =1, n =1, i =1, m is the number of steam flow, n The number of the water replenishment time, i is the number of cycles; S2: After the standby group runs stably, record the current time as T m , and start recording steam flow at the same time m s ; S3: When the liquid level of the gas-liquid separator (5) reaches the lowest level When the first water replenishment is carried out, the water replenishment time is t 1(n) , interval time t 2Start the second water replenishment, the water replenishment time is t 1(n) , interval time t 2 Start the third water replenishment until the i The liquid level of the gas-liquid separator reaches , record this moment as T m+1 , is the accuracy of the liquid level measurement; S4: Calculation T m Time has come T m+1 Average steam flow rate during the time m sp(m) , and record the maximum steam flow m s(m) ; S5: Calculate the steam flow rate reduction ratio x i =( m s(m) - m sp(m) ) / m s(m) ,like x i ≤ a %,but t 1(n) For the best water replenishment time; if x i > a %,make m = m +1, n = n +1, i = i +1, set , repeat S2~S5 until x i ≤ a %, at the current moment t 1(n) The optimal water replenishment time is a % is the maximum allowable attenuation percentage of steam flow, The time it takes to reduce the duration of a single water replenishment.

2. The intermittent water replenishment control method for a heat pump steam unit according to claim 1, characterized in that: The liquid level of the gas-liquid separator (5) is detected by a liquid level monitoring device (9).

3. The intermittent water replenishment control method for a heat pump steam unit according to claim 1, characterized in that: Water is replenished by starting the water replenishment pump (7).

4. The intermittent water replenishment control method for a heat pump steam unit according to claim 1, characterized in that: The method for judging the stable operation of the unit is: instantaneous steam flow ≥ rated steam flow under the current operating conditions.

5. The intermittent water replenishment control method for a heat pump steam unit according to claim 1, characterized in that: a The value range of % is 3%~5%.

6. A heat pump steam unit, characterized in that: The intermittent water replenishment control method of the heat pump steam unit as described in any one of claims 1 to 5 is used for control.

7. An electronic device, characterized in that: The method comprises a processor, a network interface and a memory, wherein the processor, the network interface and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions to execute the intermittent water replenishment control method for a heat pump steam unit according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that It includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the intermittent water replenishment control method for a heat pump steam unit according to any one of claims 1 to 5.

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