System and method for testing energy conversion efficiency of pressure exchange type energy recovery device

Abstract

The invention provides a system and method for testing the energy conversion efficiency of a pressure exchange type energy recovery device, and the system comprises a circulating water tank, a water outlet of the circulating water tank is connected with a water inlet of a booster pump, a water outlet of the booster pump is connected with a water inlet of a filter, and a water outlet of the filter is connected with a low-pressure raw water inlet of the energy recovery device. A high-pressure pump flow meter, a high-pressure pump, a high-pressure raw water inlet pressure transmitter, a pressure reducing valve and a simulated water production flow meter are sequentially connected between a water outlet of the filter and the circulating water tank, and a low-pressure raw water inlet pressure transmitter and a low-pressure raw water inlet flow meter are sequentially connected between the water outlet of the filter and a low-pressure raw water inlet of the energy recovery device. The efficiency test precision of the energy recovery device is greatly improved; the testing power of the testing device is reduced, the testing energy consumption is reduced, and particularly, the testing energy consumption can be greatly reduced during long-time examination operation; the size of the testing device is reduced, the investment is reduced, and the testing is more convenient.

Description

Technical Field

[0001] The present invention relates to the field of environmental engineering, and in particular to a system and method for testing the energy conversion efficiency of a pressure exchange type energy recovery device. Background Art

[0002] The pressure exchange energy recovery device is used to recover the concentrated solution hydraulic energy in the reverse osmosis desalination system and convert it into the inlet hydraulic energy of low-pressure raw water passing through the semipermeable membrane, thereby reducing the load on the high-pressure pump. The performance evaluation of the pressure exchange energy recovery device relies on accurate effective energy conversion efficiency testing. The national standard "General Technical Specifications for Reverse Osmosis Energy Recovery Devices" stipulates that at rated working pressure and rated flow, the effective energy conversion efficiency of the reverse osmosis energy recovery device should be no less than 90.0%. It also provides a test device and calculation method for the effective energy conversion efficiency that meets national standards, that is, the high-pressure raw water outlet pressure, high-pressure raw water outlet flow, low-pressure raw water inlet pressure, low-pressure raw water inlet flow, high-pressure concentrated solution inlet pressure, and high-pressure concentrated solution inlet flow are directly measured by pressure transmitters and flow meters. The calculation formula is: , in the formula ,because Approximately 1 / 30 of the original value, the three "Q" are basically equal, and to a certain extent the formula can be simplified to: , the actual physical meaning can be interpreted as: effective energy conversion efficiency "Pressure conversion efficiency (mechanical efficiency)" and "Flow conversion efficiency (volumetric efficiency)" The product is about 95% or more (95% 95%=90.25%) , in order to be qualified, that is to say, the average pressure and flow loss of the energy recovery device cannot be higher than 5%. That is, in the effective conversion efficiency test of the pressure exchange energy recovery device, use low-pressure inlet and high-pressure inlet and outlet flow meters to observe the flow loss of no more than 5%, and express it as a percentage in the efficiency formula.

[0003] However, actual flow meter readings exhibit instantaneous fluctuations. That is, while stable over time, they can fluctuate momentarily. For instruments with 1% or 0.1% accuracy, this fluctuation can range from 1-3% or even greater. This means that no matter how high the accuracy of the flow meter (which significantly increases the cost of the testing equipment), it cannot mitigate the fluctuations in flow measurement results during actual testing, which are affected by rough pipe walls, pump force fluctuations, and turbulence. In other words, a large-scale flow meter cannot accurately measure small flow fluctuations (<5%) such as low-pressure inlet and high-pressure outlet, leading to miscalculations. Furthermore, even with a highly accurate flow meter, these instantaneous flow fluctuations completely obscure the accurate measurement of the "flow conversion efficiency (volumetric efficiency)" component of "effective conversion efficiency." The same is true for pressure measurement; the "pressure loss" is very low compared to the pressure itself (generally considered to be 1.5-4% of the pressure value).

[0004] Multiplying the pressure conversion efficiency and flow conversion efficiency measurements further amplifies interference and errors. In particular, the standard requires energy conversion efficiency to be accurate to one decimal place. However, in reality, the digits before the decimal point often fail to reflect the actual situation, and the digits after the decimal point often fail to reflect the actual situation at all. As a result, the measurement results of instruments configured under the above national standards will have large errors. Even if the calculated results are the same, accurate performance comparisons between energy recovery devices through direct measurement are impossible. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a system for testing the energy conversion efficiency of a pressure exchange type energy recovery device, which can solve the problem of inaccurate results obtained by traditional devices and methods for testing the energy conversion efficiency of a pressure exchange type energy recovery device.

[0006] To this end, the present invention adopts the following technical solutions: A system for testing the energy conversion efficiency of a pressure exchange energy recovery device includes a circulating water tank, wherein the water outlet of the circulating water tank is connected to the water inlet of a booster pump, the water outlet of the booster pump is connected to the water inlet of a filter, and the water outlet of the filter is connected to the low-pressure raw water inlet of the energy recovery device. A high-pressure pump flowmeter, a high-pressure pump, a high-pressure raw water inlet pressure transmitter, a pressure reducing valve, and a simulated water production flowmeter are connected in sequence between the water outlet of the filter and the circulating water tank. A low-pressure raw water inlet pressure transmitter and a low-pressure raw water inlet flowmeter are connected in sequence between the water outlet of the filter and the low-pressure raw water inlet of the energy recovery device. An energy recovery device boost pump, a high-pressure concentrated water inlet pressure transmitter, and a high-pressure concentrated water inlet flowmeter are connected in sequence between the high-pressure raw water outlet of the energy recovery device and the high-pressure concentrated water inlet of the energy recovery device. The inlet of the pressure reducing valve is connected between the outlet of the boost pump of the energy recovery device, and a differential pressure transmitter is connected between the high-pressure raw water outlet of the energy recovery device and the high-pressure concentrated water inlet of the energy recovery device.

[0007] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions, or use these further technical solutions in combination: The low-pressure concentrated water outlet of the energy recovery device is connected to the circulating water tank.

[0008] The measuring range of the high pressure pump flow meter (54) is 5m 3 / h, the range of the simulated water production flow meter (56) is 5m 3 / h, the range of the low-pressure raw water inlet flow meter (51) is 120m 3 / h, the range of the low-pressure raw water inlet pressure transmitter (91) is 10.0 MPa, and the range of the high-pressure concentrated water inlet flowmeter (53) is 120 m 3 / h, the measuring range of the high-pressure concentrated water inlet pressure transmitter (93) is 10.0 MPa, and the measuring range of the differential pressure transmitter (94) is 0.20 MPa.

[0009] The purpose of the present invention is also to overcome the shortcomings of the above-mentioned prior art and provide a method for testing the energy conversion efficiency of a pressure exchange type energy recovery device, which can solve the problem of inaccurate results obtained by traditional devices and methods for testing the energy conversion efficiency of a pressure exchange type energy recovery device.

[0010] To this end, the present invention adopts the following technical solutions: The method for testing the energy conversion efficiency of a pressure exchange type energy recovery device comprises the following steps: 1. After the system is running stably, measure the following values: The high-pressure concentrated water inlet pressure of the energy recovery device is measured according to the reading of the high-pressure concentrated water inlet pressure transmitter. , the pressure loss value of the high-pressure flow of the energy recovery device is measured according to the reading of the differential pressure transmitter , the high-pressure concentrated water inlet flow rate of the energy recovery device is measured according to the reading of the high-pressure concentrated water inlet flow meter The flow loss value of high pressure flow is calculated based on the difference between the reading of the high pressure pump flow meter and the reading of the simulated water production flow meter. , the low pressure raw water inlet pressure is measured according to the reading of the low pressure raw water inlet pressure transmitter , the low pressure raw water inlet flow rate is measured according to the reading of the low pressure raw water inlet flow meter ; 2. Calculate based on the value measured in step 1: In the national standard, the formula for calculating effective energy conversion efficiency is: , the transformed formula is: , by substituting the data measured in step 1 into the converted formula, the effective energy conversion efficiency of the energy recovery device can be calculated.

[0011] Compared with the prior art, the present invention has the following advantages and beneficial effects: it greatly improves the efficiency test accuracy of the energy recovery device; it reduces the power of the test device during testing, reduces the test energy consumption, and especially greatly reduces the test energy consumption during long-term assessment operation; it reduces the volume of the test device, reduces investment, and makes testing more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the conversion efficiency test of a traditional energy recovery device; Figure 2 It is a schematic diagram of the conversion efficiency process test of the present invention. DETAILED DESCRIPTION

[0013] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred embodiments of the present invention are described below in conjunction with specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent elements with the same or similar functions. However, it should be understood that the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention. In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings, and the positional relationships described in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention.

[0014] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0015] The system for testing the energy conversion efficiency of a pressure exchange type energy recovery device provided by the present invention comprises a circulating water tank 1, the water outlet of the circulating water tank 1 is connected to the water inlet of a booster pump 2, the water outlet of the booster pump 2 is connected to the water inlet of a filter 3, the water outlet of the filter 3 is connected to the low-pressure raw water inlet of an energy recovery device 7, a high-pressure pump flow meter 54, a high-pressure pump 4, a high-pressure raw water inlet pressure transmitter 92, a pressure reducing valve 6, and a simulated water production flow meter 56 are connected in sequence between the water outlet of the filter 3 and the circulating water tank 1, and the water outlet of the filter 3 is connected to the energy recovery device 7. The low-pressure raw water inlet pressure transmitter 91 and the low-pressure raw water inlet flowmeter 51 are connected in sequence between the low-pressure raw water inlet of the energy recovery device 7, the energy recovery device lifting pump 8, the high-pressure concentrated water inlet pressure transmitter 93, and the high-pressure concentrated water inlet flowmeter 53 are connected in sequence between the high-pressure raw water outlet of the energy recovery device 7 and the high-pressure concentrated water inlet of the energy recovery device 7, the inlet of the pressure reducing valve 6 and the outlet of the energy recovery device lifting pump 8 are connected, and the high-pressure raw water outlet of the energy recovery device 7 and the high-pressure concentrated water inlet of the energy recovery device 7 are connected with a differential pressure transmitter 94.

[0016] The present invention optimizes the measurement path and reduces the equipment required for measurement, thereby reducing hardware costs and shrinking the system size.

[0017] Since the energy recovery device is symmetrical between high and low pressure, and the pressure loss of the flow channel is only related to the flow value passing through the flow channel, the high-pressure pressure difference can be calculated by analogy by testing the pressure difference on the low-pressure side. The energy recovery device lift pump does not need to be installed or started during the test.

[0018] The low-pressure concentrated water outlet of the energy recovery device 7 is connected to the circulating water tank 1 .

[0019] The measuring range of the high pressure pump flow meter (54) is 5m 3 / h, the range of the simulated water production flow meter (56) is 5m 3 / h, the range of the low-pressure raw water inlet flow meter (51) is 120m 3 / h, the range of the low-pressure raw water inlet pressure transmitter (91) is 10.0 MPa, and the range of the high-pressure concentrated water inlet flowmeter (53) is 120 m 3 / h, the measuring range of the high-pressure concentrated water inlet pressure transmitter (93) is 10.0 MPa, and the measuring range of the differential pressure transmitter (94) is 0.20 MPa.

[0020] The present invention improves the measurement and reading accuracy by using a small-range scale, thereby improving the accuracy of calculation results.

[0021] The present invention provides a method for testing the energy conversion efficiency of a pressure exchange type energy recovery device, comprising the following steps: 1. After the system is running stably, measure the following values: The high-pressure concentrated water inlet pressure of the energy recovery device 7 is measured based on the reading of the high-pressure concentrated water inlet pressure transmitter 93. , the pressure loss value of the high pressure flow of the energy recovery device 7 is measured according to the reading of the differential pressure transmitter 94 The high-pressure concentrated water inlet flow rate of the energy recovery device 7 is measured according to the reading of the high-pressure concentrated water inlet flow meter 53. The flow loss value of high pressure flow is calculated based on the difference between the reading of the high pressure pump flow meter 54 and the reading of the simulated water production flow meter 56. , the low pressure raw water inlet pressure is measured according to the reading of the low pressure raw water inlet pressure transmitter 91 , the low pressure raw water inlet flow rate is measured according to the reading of the low pressure raw water inlet flow meter 51 ; 2. Calculate based on the value measured in step 1: In the national standard, the formula for calculating effective energy conversion efficiency is: , the transformed formula is: , by substituting the data measured in step 1 into the transformed formula, the effective energy conversion efficiency of the energy recovery device 7 can be calculated.

[0022] The present invention measures the pressure loss value of high pressure flow and flow loss value of high pressure flow Offset the interference of pump pulsation, thereby improving the accuracy of measurement results.

[0023] One embodiment of the system and method for testing the energy conversion efficiency of a pressure exchange energy recovery device according to the present invention is as follows: Also using an instrument with an accuracy of 1%, a 100m 3 / h*6MPa high-pressure concentrated water, high-pressure flow loss of energy recovery device 1m 3 The effective conversion efficiency of the energy recovery system with a pressure loss of 0.1 MPa and a power consumption of 1000 sq ft / h can be theoretically calculated as follows: Due to the normal error of the instrument, the minimum effective conversion efficiency of the test results can be theoretically calculated as follows: The above results are very close to the effective conversion efficiency of 93.72% of the actual energy recovery device.

[0024] It can be calculated that the minimum power for testing the high-pressure pump (with an efficiency of 80%) is 1*6 / 3.67 / 0.8=2.04kW.

[0025] Based on the description and drawings of the present invention, those skilled in the art can easily manufacture or use the system and method for testing the energy conversion efficiency of the pressure exchange energy recovery device of the present invention, and can produce the positive effects described in the present invention.

[0026] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two mechanisms, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0027] In the description of the present invention, it should be understood that terms such as "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right" indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the mechanisms or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "first" and "second" are used solely for brevity and are not intended to indicate or imply relative importance.

[0028] Furthermore, in practicing the claimed invention, variations to the disclosed embodiments may be understood and effected by those skilled in the art through a study of the drawings, the disclosure, and the appended claims. Furthermore, in the claims and the specification, words such as "comprise," "comprising," and the like do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications made according to the present invention are covered by the scope of the claims of the present invention and will not be listed one by one here.

Claims

1. A system for testing the energy conversion efficiency of a pressure exchange energy recovery device, characterized in that: The invention comprises a circulating water tank (1), wherein the water outlet of the circulating water tank (1) is connected to the water inlet of the boosting pump (2), the water outlet of the boosting pump (2) is connected to the water inlet of the filter (3), the water outlet of the filter (3) is connected to the low-pressure raw water inlet of the energy recovery device (7), and a high-pressure pump flow meter (54), a high-pressure pump (4), a high-pressure raw water inlet pressure transmitter (92), a pressure reducing valve (6), and a simulated water production flow meter (56) are connected in sequence between the water outlet of the filter (3) and the circulating water tank (1), and the water outlet of the filter (3) and the low-pressure raw water inlet of the energy recovery device (7) are connected in sequence between the water outlet of the filter (3). A low-pressure raw water inlet pressure transmitter (91) and a low-pressure raw water inlet flowmeter (51) are connected in sequence; an energy recovery device lift pump (8), a high-pressure concentrated water inlet pressure transmitter (93), and a high-pressure concentrated water inlet flowmeter (53) are connected between the high-pressure raw water outlet of the energy recovery device (7) and the high-pressure concentrated water inlet of the energy recovery device (7); an inlet of the pressure reducing valve (6) and an outlet of the energy recovery device lift pump (8) are connected; and a differential pressure transmitter (94) is connected between the high-pressure raw water outlet of the energy recovery device (7) and the high-pressure concentrated water inlet of the energy recovery device (7).

2. The system for testing the energy conversion efficiency of a pressure exchange type energy recovery device according to claim 1, wherein: The low-pressure concentrated water outlet of the energy recovery device (7) is connected to the circulating water tank (1).

3. The system for testing the energy conversion efficiency of a pressure exchange type energy recovery device according to claim 1, wherein: The measuring range of the high pressure pump flow meter (54) is 5m 3 / h, the range of the simulated water production flow meter (56) is 5m 3 / h, the range of the low-pressure raw water inlet flow meter (51) is 120m 3 / h, the range of the low-pressure raw water inlet pressure transmitter (91) is 10.0 MPa, and the range of the high-pressure concentrated water inlet flowmeter (53) is 120 m 3 / h, the measuring range of the high-pressure concentrated water inlet pressure transmitter (93) is 10.0 MPa, and the measuring range of the differential pressure transmitter (94) is 0.20 MPa.

4. The method for testing the energy conversion efficiency of a pressure exchange type energy recovery device according to claim 1, characterized in that: The following steps are involved:

1. After the system is running stably, measure the following values: The high-pressure concentrated water inlet pressure of the energy recovery device (7) is measured based on the reading of the high-pressure concentrated water inlet pressure transmitter (93). , the pressure loss value of the high pressure flow of the energy recovery device (7) is measured based on the reading of the differential pressure transmitter (94) The high-pressure concentrated water inlet flow rate of the energy recovery device (7) is measured based on the reading of the high-pressure concentrated water inlet flow meter (53). The flow loss value of the high-pressure flow is calculated based on the difference between the reading of the high-pressure pump flow meter (54) and the reading of the simulated water production flow meter (56). , the low pressure raw water inlet pressure is measured according to the reading of the low pressure raw water inlet pressure transmitter (91) , the low-pressure raw water inlet flow rate is measured according to the reading of the low-pressure raw water inlet flow meter (51) ; 2. Calculate based on the value measured in step 1: In the national standard, the formula for calculating effective energy conversion efficiency is: , the transformed formula is: , by substituting the data measured in step 1 into the transformed formula, the effective energy conversion efficiency of the energy recovery device 7 can be calculated.

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