Multi-parameter desulfurization absorption tower energy consumption evaluation method and system

Abstract

The application discloses a kind of multi-parameter desulfurization absorption tower energy consumption evaluation method and system, and evaluation method includes following process: the desulfurization efficiency and unit energy consumption of desulfurization absorption tower under each working condition are calculated;When the energy consumption of two kinds of working conditions of desulfurization absorption tower is evaluated, the unit energy consumption efficiency ratio of the two kinds of working conditions is calculated, for the working condition with lower unit energy consumption efficiency ratio value, the energy consumption economy of desulfurization absorption tower running under the working condition is evaluated better;When the energy consumption of more than three kinds of working conditions of desulfurization absorption tower is evaluated, the energy consumption efficiency difference ratio of each non-basic working condition and basic working condition is calculated respectively, for the non-basic working condition with minimum energy consumption efficiency difference ratio, the energy consumption economy of desulfurization absorption tower running under the non-basic working condition is evaluated better.The application can carry out the analysis benchmark of desulfurization absorption tower energy consumption comparison under different working conditions, and the running economy of desulfurization absorption tower can be more accurately evaluated.

Description

Technical Field

[0001] This invention belongs to the technical field of economic evaluation of desulfurization absorption tower operation, specifically involving a multi-parameter desulfurization absorption tower energy consumption evaluation method and system. Background Technology

[0002] Wet desulfurization technology is widely used in thermal power plants. The energy consumption of desulfurization systems accounts for over 30% of the plant's electricity consumption, highlighting a significant need for optimizing operational economics. As the core equipment of the desulfurization system, the desulfurization absorption tower's operational economics determines the overall system's economic performance. Currently, there is no unified evaluation method for analyzing the operating status of desulfurization absorption towers under different conditions. The main difficulty lies in the numerous parameters affecting the operational economics of desulfurization absorption towers, and the lack of comprehensive basic indicators to characterize the operational economics of desulfurization absorption towers under different conditions. Furthermore, the amount of flue gas processed and the desulfurization efficiency achieved by the desulfurization absorption tower vary under different operating conditions, making direct comparison of operating energy consumption impossible. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention aims to provide a multi-parameter desulfurization absorption tower energy consumption evaluation method and system. The present invention can establish an analytical benchmark for comparing the energy consumption of desulfurization absorption towers under different operating conditions, and can more accurately evaluate the operational economy of desulfurization absorption towers.

[0004] The technical solution adopted in this invention is as follows:

[0005] A multi-parameter desulfurization absorption tower energy consumption evaluation method includes the following process:

[0006] Calculate the desulfurization efficiency of the desulfurization absorption tower under various operating conditions;

[0007] Calculate the unit energy consumption of the desulfurization absorption tower under various operating conditions;

[0008] When evaluating the energy consumption of the desulfurization absorption tower under two operating conditions, the ratio of unit energy consumption efficiency of the two operating conditions is calculated by the desulfurization efficiency and unit energy consumption of the two operating conditions. For the operating condition with a lower unit energy consumption efficiency ratio, the energy consumption economy of the desulfurization absorption tower under the operating condition is evaluated as better.

[0009] When evaluating the energy consumption of a desulfurization absorption tower under three or more operating conditions, the operating condition with the lowest unit energy consumption and desulfurization efficiency among all operating conditions is selected as the basic operating condition. The other operating conditions are used as non-basic operating conditions. Using the unit energy consumption and desulfurization efficiency of the non-basic operating conditions and the basic operating conditions, the energy efficiency difference ratio between each non-basic operating condition and the basic operating condition is calculated. For the non-basic operating condition with the smallest energy efficiency difference ratio, the energy economy of the desulfurization absorption tower under this non-basic operating condition is evaluated as better.

[0010] Preferably, the desulfurization efficiency characterizes the ability of the desulfurization absorption tower to remove SO2, and the calculation formula is as follows:

[0011]

[0012] In the formula: η represents the desulfurization efficiency. This represents the SO2 concentration in the original flue gas converted to standard conditions, dry basis, and 6% O2.

[0013] This represents the SO2 concentration in the net flue gas converted to standard conditions, dry basis, and 6% O2.

[0014] Preferably, the unit energy consumption refers to the energy consumption required for the desulfurization absorption tower to treat a unit volume of flue gas, and the calculation formula is as follows:

[0015] W = P / Q

[0016] In the formula: W represents the unit energy consumption, P represents the total power of the electrical equipment of the desulfurization absorption tower, and Q represents the flue gas flow rate at the outlet of the desulfurization absorption tower, converted to standard conditions, dry basis, and 6% O2.

[0017] Preferably, the unit energy efficiency ratio is the ratio of the total energy consumption required for desulfurization of a unit volume of flue gas to the desulfurization efficiency.

[0018] Preferably, the unit energy consumption efficiency difference ratio is the ratio of the energy consumption difference per unit volume of flue gas desulfurization absorption tower to the desulfurization efficiency difference between the two operating conditions.

[0019] This invention also provides a multi-parameter desulfurization absorption tower energy consumption evaluation system, comprising:

[0020] The first calculation module is used to calculate the desulfurization efficiency of the desulfurization absorption tower under various operating conditions.

[0021] The second calculation module is used to calculate the unit energy consumption of the desulfurization absorption tower under various operating conditions.

[0022] The first evaluation module is used to evaluate the energy consumption of the desulfurization absorption tower under two operating conditions. When evaluating the energy consumption of the desulfurization absorption tower under two operating conditions, the unit energy consumption efficiency ratio of the two operating conditions is calculated by the desulfurization efficiency and unit energy consumption of the two operating conditions. For the operating condition with a lower unit energy consumption efficiency ratio, the energy consumption economy of the desulfurization absorption tower under the operating condition is evaluated as better.

[0023] The second evaluation module is used to evaluate the energy consumption of the desulfurization absorption tower under three or more operating conditions. When evaluating the energy consumption of the desulfurization absorption tower under three or more operating conditions, the operating condition with the lowest unit energy consumption and desulfurization efficiency is selected as the basic operating condition. The other operating conditions are used as non-basic operating conditions. Using the unit energy consumption and desulfurization efficiency of the non-basic operating conditions and the basic operating conditions, the energy efficiency difference ratio between each non-basic operating condition and the basic operating condition is calculated. For the non-basic operating condition with the smallest energy efficiency difference ratio, the energy economy of the desulfurization absorption tower under this non-basic operating condition is evaluated as better.

[0024] The present invention has the following beneficial effects:

[0025] This invention defines two indicators: unit energy efficiency ratio and unit energy efficiency difference ratio. The unit energy efficiency ratio is used to compare the energy consumption and economic efficiency of desulfurization absorption towers under two operating conditions. For operating conditions with a lower unit energy efficiency ratio, the energy consumption and economic efficiency of the desulfurization absorption tower under that condition is considered better. The unit energy efficiency difference ratio is used to compare the energy consumption and economic efficiency of desulfurization absorption towers under three or more operating conditions. For non-basic operating conditions with the smallest energy efficiency difference ratio, the energy consumption and economic efficiency of the desulfurization absorption tower under that non-basic operating condition is considered better. Therefore, the technical solution of this invention establishes an analytical benchmark for comparing the energy consumption of desulfurization absorption towers under different operating conditions. Based on this, the operational economic efficiency of desulfurization absorption towers under different operating conditions can be evaluated more accurately, thereby guiding the economical operation mode of desulfurization absorption towers and achieving energy saving and consumption reduction effects. Detailed Implementation

[0026] The present invention will be further described below with reference to the embodiments.

[0027] The energy consumption evaluation method for multi-parameter desulfurization absorption towers of this invention includes the following steps:

[0028] 1) Calculate the desulfurization efficiency η of the desulfurization absorption tower under various operating conditions:

[0029] Desulfurization efficiency characterizes the ability of a desulfurization absorption tower to remove SO2. The calculation formula is as follows:

[0030]

[0031] In the formula: —The SO2 concentration in the original flue gas converted to standard conditions, dry basis, and 6% O2;

[0032] — SO2 concentration in net flue gas converted to standard conditions, dry basis, and 6% O2.

[0033] 2) Calculate the unit energy consumption W of the desulfurization absorption tower under various operating conditions:

[0034] Unit energy consumption refers to the energy consumption required for a desulfurization absorption tower to treat a unit volume of flue gas. The calculation formula is as follows:

[0035] W = P / Q

[0036] In the formula: P—total power of electrical equipment in the desulfurization absorption tower, mainly including: slurry circulation pump, booster fan, oxidation fan, agitator and thermal instruments;

[0037] Q – Flue gas flow rate at the outlet of the desulfurization absorption tower, converted to standard conditions, dry basis, 6% O2.

[0038] 3) When evaluating the energy consumption of the desulfurization absorption tower under two operating conditions, calculate the unit energy efficiency ratio M for each operating condition:

[0039] The energy efficiency ratio characterizes the economic efficiency of desulfurization absorption tower operation; it is the ratio of the total energy consumption required for desulfurization per unit volume of flue gas to the desulfurization efficiency. The calculation formula is as follows:

[0040] M = W / η

[0041] Where: W—energy consumption required for the desulfurization absorption tower to process a unit volume of flue gas;

[0042] η—Desulfurization efficiency of the desulfurization absorption tower, η≠0.

[0043] This indicator can be used to compare the operational economy of desulfurization absorption towers with different desulfurization efficiencies under different operating conditions. The smaller the value, the less energy is required per unit of desulfurization efficiency, indicating that the desulfurization absorption tower operates more economically under that condition.

[0044] 4) When evaluating the energy consumption of a desulfurization absorption tower under three or more operating conditions, calculate the unit energy efficiency difference ratio M′ between each non-basic operating condition and the basic operating condition:

[0045] When the calculated unit energy consumption efficiency ratios under different operating conditions are relatively close, in order to more accurately analyze and compare the economic performance of the desulfurization absorption tower, the energy consumption efficiency difference ratio is defined as follows: numerically, it is equal to the ratio of the energy consumption difference per unit volume of flue gas desulfurization absorption tower between two operating conditions to the desulfurization efficiency difference. The calculation formula is as follows:

[0046] M′=(W i -W0) / (η i -η0)

[0047] In the formula: W i —Energy consumption required for the desulfurization absorption tower to process a unit volume of flue gas under non-basic operating condition i;

[0048] W0—Energy consumption required by the desulfurization absorption tower to process a unit volume of flue gas under basic operating conditions;

[0049] η i —Desulfurization efficiency of the desulfurization absorption tower under operating condition i;

[0050] η0 — Desulfurization efficiency of the desulfurization absorption tower under basic operating conditions.

[0051] When conducting an economic analysis of the desulfurization absorption tower under three or more operating conditions, the group with the lowest unit energy consumption and desulfurization efficiency is selected as the base operating condition. The energy efficiency difference ratio between the non-base operating condition and the base operating condition is calculated. The lower the value, the less energy is required to improve the unit efficiency under the base operating condition, indicating that the desulfurization absorption tower operates more economically under this condition.

[0052] Example 1

[0053] This embodiment uses the energy consumption evaluation of two operating conditions of the desulfurization absorption tower as an example for illustration. Specifically, it analyzes the comparative test data of a single-layer spray layer on the desulfurization test device. The experimental data results of operating conditions 1 and 2 are shown in Table 1.

[0054] Table 1

[0055]

[0056] As shown in Table 1, spray layers A and B were operated separately, and two sets of test data were obtained for operating conditions 1 and 2. The calculated desulfurization efficiency for operating condition 1 was 49.09%, and the unit energy consumption was 5.11 W / m². 3 The energy efficiency ratio is 8.25; the desulfurization efficiency under operating condition 2 is 51.29%, and the unit energy consumption is 5.35 W / m³. 3 The energy efficiency ratio is 8.33. This indicates that while operating condition 2 has a higher desulfurization efficiency, its unit energy consumption is higher, and its energy efficiency ratio is also higher. This suggests that while operating condition 2 achieves higher desulfurization efficiency, it incurs more energy costs compared to operating condition 1, making the desulfurization absorption tower in operating condition 2 less economical. Therefore, it is more appropriate to operate the A-layer spray layer when using a single-layer spray system.

[0057] Example 2

[0058] This embodiment takes the energy consumption evaluation of four operating conditions of the desulfurization absorption tower as an example for illustration. Specifically, it analyzes the comparative test data of a single-layer spray layer on the desulfurization test device. The experimental data results of operating conditions 0 to 3 are shown in Table 2.

[0059] Table 2

[0060]

[0061] As shown in Table 2, spray layers A and B were put into operation under operating condition 0, and spray layers A, B, and C were put into operation under operating conditions 1, 2, and 3. The frequency of the slurry circulation pump motor in spray layer C was changed to obtain the test data for each group. The calculated desulfurization efficiency under operating condition 0 was 82.33%, and the unit energy consumption was 4.73 W / m³. 3 The desulfurization efficiency and unit energy consumption are the lowest among all operating conditions, so operating condition 0 is selected as the basic operating condition; the desulfurization efficiency of operating condition 1 is 90.88%, and the unit energy consumption is 5.71 W / m³. 3 The energy efficiency difference between operating condition 0 and operating condition 2 is 11.44; the desulfurization efficiency of operating condition 2 is 89.27%, and the unit energy consumption is 5.71 W / m³. 3 The energy efficiency difference compared to operating condition 0 is 12.15; the desulfurization efficiency of operating condition 3 is 86.87%, and the unit energy consumption is 5.44 W / m³. 3 The energy efficiency difference ratio relative to condition 0 is 15.63. This indicates that condition 1 has the highest desulfurization efficiency and the highest unit energy consumption, but its energy efficiency difference ratio relative to condition 0 is the smallest. This means that improving unit efficiency in condition 1 compared to condition 0 requires the least energy consumption, indicating that among conditions 1-3, condition 1 has the best operational economy for the desulfurization absorption tower. Therefore, when operating the C spray layer, with the motor frequency varying from 40 to 36 Hz, the optimal operating frequency for the C slurry circulation pump motor is 40 Hz.

Claims

1. A method for evaluating the energy consumption of a multi-parameter desulfurization absorption tower, characterized in that, The process includes the following: Calculate the desulfurization efficiency of the desulfurization absorption tower under various operating conditions; the desulfurization efficiency characterizes the ability of the desulfurization absorption tower to remove SO2, and the calculation formula is as follows: In the formula: η Indicates desulfurization efficiency. This represents the SO2 concentration in the original flue gas converted to standard conditions, dry basis, and 6% O2. This represents the SO2 concentration in the net flue gas converted to standard conditions, dry basis, and 6% O2. Calculate the unit energy consumption of the desulfurization absorption tower under various operating conditions; The unit energy consumption refers to the energy consumption required for the desulfurization absorption tower to treat a unit volume of flue gas. The calculation formula is as follows: W = P / Q In the formula: W Indicates unit energy consumption. P This indicates the total power of the electrical equipment in the desulfurization absorption tower; Q This represents the flue gas flow rate at the outlet of the desulfurization absorption tower, converted to standard conditions, dry basis, and 6% O2. When evaluating the energy consumption of the desulfurization absorption tower under two operating conditions, the ratio of unit energy consumption efficiency of the two operating conditions is calculated by the desulfurization efficiency and unit energy consumption of the two operating conditions. For the operating condition with a lower unit energy consumption efficiency ratio, the energy consumption economy of the desulfurization absorption tower under the operating condition is evaluated as better. When evaluating the energy consumption of a desulfurization absorption tower under three or more operating conditions, the operating condition with the lowest unit energy consumption and desulfurization efficiency among all operating conditions is selected as the basic operating condition. The other operating conditions are used as non-basic operating conditions. Using the unit energy consumption and desulfurization efficiency of the non-basic operating conditions and the basic operating conditions, the energy efficiency difference ratio between each non-basic operating condition and the basic operating condition is calculated. For the non-basic operating condition with the smallest energy efficiency difference ratio, the energy economy of the desulfurization absorption tower under this non-basic operating condition is evaluated as better.

2. The method for evaluating the energy consumption of a multi-parameter desulfurization absorption tower according to claim 1, characterized in that, The unit energy efficiency ratio is the ratio of the total energy consumption required for desulfurization of a unit volume of flue gas to the desulfurization efficiency.

3. The method for evaluating the energy consumption of a multi-parameter desulfurization absorption tower according to claim 1, characterized in that, The unit energy consumption efficiency difference ratio is the ratio of the energy consumption difference per unit volume of flue gas desulfurization absorption tower to the desulfurization efficiency difference between two operating conditions.

4. A multi-parameter desulfurization absorption tower energy consumption evaluation system, characterized in that, include: The first calculation module is used to calculate the desulfurization efficiency of the desulfurization absorption tower under various operating conditions. The desulfurization efficiency characterizes the ability of the desulfurization absorption tower to remove SO2, and the calculation formula is as follows: In the formula: η Indicates desulfurization efficiency. This represents the SO2 concentration in the original flue gas converted to standard conditions, dry basis, and 6% O2. This represents the SO2 concentration in the net flue gas converted to standard conditions, dry basis, and 6% O2. The second calculation module is used to calculate the unit energy consumption of the desulfurization absorption tower under various operating conditions. The unit energy consumption refers to the energy consumption required for the desulfurization absorption tower to treat a unit volume of flue gas. The calculation formula is as follows: W = P / Q In the formula: W Indicates unit energy consumption. P This indicates the total power of the electrical equipment in the desulfurization absorption tower; Q This represents the flue gas flow rate at the outlet of the desulfurization absorption tower, converted to standard conditions, dry basis, and 6% O2. The first evaluation module is used to evaluate the energy consumption of the desulfurization absorption tower under two operating conditions. When evaluating the energy consumption of the desulfurization absorption tower under two operating conditions, the unit energy consumption efficiency ratio of the two operating conditions is calculated by the desulfurization efficiency and unit energy consumption of the two operating conditions. For the operating condition with a lower unit energy consumption efficiency ratio, the energy consumption economy of the desulfurization absorption tower under the operating condition is evaluated as better. The second evaluation module is used to evaluate the energy consumption of the desulfurization absorption tower under three or more operating conditions. When evaluating the energy consumption of the desulfurization absorption tower under three or more operating conditions, the operating condition with the lowest unit energy consumption and desulfurization efficiency is selected as the basic operating condition. The other operating conditions are used as non-basic operating conditions. Using the unit energy consumption and desulfurization efficiency of the non-basic operating conditions and the basic operating conditions, the energy efficiency difference ratio between each non-basic operating condition and the basic operating condition is calculated. For the non-basic operating condition with the smallest energy efficiency difference ratio, the energy economy of the desulfurization absorption tower under this non-basic operating condition is evaluated as better.

5. The multi-parameter desulfurization absorption tower energy consumption evaluation system according to claim 4, characterized in that, The unit energy efficiency ratio is the ratio of the total energy consumption required for desulfurization of a unit volume of flue gas to the desulfurization efficiency.

6. The multi-parameter desulfurization absorption tower energy consumption evaluation system according to claim 4, characterized in that, The unit energy consumption efficiency difference ratio is the ratio of the energy consumption difference per unit volume of flue gas desulfurization absorption tower to the desulfurization efficiency difference between two operating conditions.

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