Adsorption treatment method for flue gas desulfurization and denitrification

Abstract

This invention relates to the field of flue gas treatment technology, specifically to an adsorption treatment method for flue gas desulfurization and denitrification. The adsorption treatment method for flue gas desulfurization and denitrification includes: measuring NO in the flue gas... x The volume ratio x of SO2 and NO in the flue gas; x The volume ratio x of SO2 and the pre-obtained adsorption material for NO at different temperatures x The flue gas temperature T to be controlled is determined by the saturated adsorption curve of SO2; the flue gas temperature is adjusted to temperature T, and the flue gas is treated by adsorption material. The flue gas desulfurization and denitrification adsorption treatment method of the present invention can achieve near-zero emissions of coal-fired flue gas while reducing the amount of adsorption material used.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, and specifically to an adsorption treatment method for flue gas desulfurization and denitrification. Background Technology

[0002] Coal-fired power plants emit large amounts of SO2 and NO through flue gas from coal combustion. x Particulate pollutants, particularly those in coal-fired flue gas, are a significant contributor to air pollution. While moving bed adsorption towers are often used to adsorb these pollutants, achieving near-zero emissions from coal-fired flue gas requires a large amount of material to achieve this goal. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes an adsorption treatment method for flue gas desulfurization and denitrification, which can achieve near-zero emissions of coal-fired flue gas while reducing the amount of adsorption material used.

[0004] The adsorption treatment method for flue gas desulfurization and denitrification proposed in this invention includes:

[0005] Measurement of NO in flue gas x The volume ratio x of SO2;

[0006] According to the NO in the flue gas x The volume ratio x of SO2 and the pre-obtained adsorption material for NO at different temperatures x The saturated adsorption curve of SO2 is used to determine the flue gas temperature T that needs to be controlled.

[0007] The flue gas temperature is adjusted to temperature T, and the flue gas is adsorbed using the adsorption material.

[0008] The present invention proposes an adsorption treatment method for flue gas desulfurization and denitrification, which involves adsorbing NO in the flue gas... x The volume ratio x of NO to SO2 was determined, and then different flue gas temperatures T were applied to different volume ratios x. By adjusting the flue gas temperature, the adsorption effect of the adsorbent material on NO was changed. x The adsorption capacity of SO2 makes the adsorption material effective against NO. x While saturating with adsorption, SO2 is also saturated, so as to reduce the amount of adsorption material used and achieve near-zero emissions of coal-fired flue gas.

[0009] Optionally, the treatment method further includes: removing NO from the flue gas. x The volume ratio x of SO2 is monitored periodically to adjust the flue gas temperature.

[0010] The flue gas desulfurization and denitrification adsorption treatment method of the present invention removes NO from the flue gas during the adsorption process. x The volume ratio of NO to SO2 is monitored in real time, and the NO content is adjusted based on the real-time monitoring data. x The volume ratio of NO to SO2 is adjusted to control the flue gas temperature so that the adsorption capacity of the adsorbent material is better matched to the NO in the flue gas. x The volume ratio of SO2 to adsorbent increases the adsorption capacity of the adsorbent material, thereby reducing the amount of adsorbent material used.

[0011] Optionally, the adsorbent material is activated carbon.

[0012] Activated carbon is a very small carbon particle with a large number of pores and surface area. Compared with other adsorbent materials, activated carbon has a stronger adsorption capacity. Using activated carbon as an adsorbent material can reduce the amount of adsorbent material used compared to using other adsorbent materials.

[0013] Optionally, the NO in the flue gas x The volume ratio x of SO2 and the flue gas temperature T to be controlled satisfy the following relationship: T = -43.00 - 28.84 * ln(x + 0.0056).

[0014] The adsorption treatment method for flue gas desulfurization and denitrification of this invention obtains NO in flue gas through experiments. x The relationship between the volume ratio x of SO2 and the flue gas temperature T to be controlled is used to adjust the flue gas temperature T so that the adsorbent material can withstand different NO2 concentrations. x The volume ratio x of SO2 can maintain a better adsorption capacity, thereby reducing the amount of adsorption material used.

[0015] Optionally, when the flue gas contains NO x When the volume ratio of NO to SO2 is 0 < x < 0.03, the flue gas temperature is adjusted to 50℃ < T ≤ 80℃; when the NO content in the flue gas is... x When the volume ratio of NO to SO2 is 0.03 ≤ x < 0.07, the flue gas temperature is adjusted to 20℃ < T ≤ 50℃; when the NO in the flue gas x When the volume ratio of NO to SO2 is 0.07 ≤ x < 0.15, the flue gas temperature is adjusted to 10℃ < T ≤ 20℃; when the NO in the flue gas x When the volume ratio of NO to SO2 is 0.15 ≤ x < 0.23, the flue gas temperature is adjusted to 0℃ < T ≤ 10℃; when the NO in the flue gas x When the volume ratio of NO to SO2 is 0.23 ≤ x < 0.32, the flue gas temperature is adjusted to -10℃ < T ≤ 0℃; when the NO in the flue gas x When the volume ratio of NO to SO2 is 0.32 ≤ x < 0.5, the flue gas temperature is adjusted to -20℃ < T ≤ -10℃; when the NO in the flue gas xWhen the volume ratio of SO2 to x is ≥ 0.5, the flue gas temperature T is adjusted to -20℃.

[0016] The flue gas desulfurization and denitrification adsorption treatment method of the present invention uses NO in flue gas at different volume ratios for adsorption treatment. x Different temperature ranges are set for NO compared to SO2, but the overall temperature range follows NO. x The higher the volume ratio of NO to SO2, the lower the required flue gas temperature. x When the volume ratio of SO2 to SO2 is greater than or equal to 0.5, the flue gas temperature is adjusted to -20℃. Considering that the lower the flue gas temperature is, the more cooling is required and the greater the energy consumption, and the flue gas temperature cannot be lowered indefinitely, -20℃ is set as the minimum temperature to avoid excessive cooling consumption and thus control the adsorption cost.

[0017] Optionally, the NO in the flue gas x Or the SO2 content does not exceed 4000 ppm.

[0018] When NO in flue gas x Or when the SO2 content exceeds 4000 ppm, the NO in the flue gas x If the SO2 content is too high, the adsorption effect of the adsorbent will be affected.

[0019] Optionally, the adsorption treatment is carried out in a moving bed adsorption tower.

[0020] The adsorption process of the flue gas desulfurization and denitrification adsorption treatment method of the present invention is carried out in a moving bed adsorption tower. During the adsorption process in the moving bed adsorption tower, the adsorbent material follows the airflow to complete the adsorption, and the adsorption effect of the adsorbent material is better. The adsorbent material is loaded from the top of the moving bed adsorption tower, and the adsorbent material that has completed adsorption flows out from the bottom of the moving bed adsorption tower and enters the regeneration tower for regeneration and circulation.

[0021] Optionally, the circulation rate of the adsorbent material in the moving bed adsorption tower is determined based on the saturated adsorption capacity of the adsorbent material and the flue gas volume.

[0022] The circulating amount of the adsorbent material in the moving bed adsorption tower of this invention is determined comprehensively based on the saturated adsorption capacity of the adsorbent material and the flue gas volume, so that the adsorbent material in the moving bed adsorption tower can effectively adsorb NO in the flue gas. x Alternatively, SO2 can be fully adsorbed, ensuring the adsorption effect of the adsorption material while reducing the amount of adsorption material used. Moreover, by linking the circulation rate of the adsorption material to the flue gas volume, the larger the flue gas volume, the larger the circulation rate of the adsorption material in the moving bed adsorption tower, and the smaller the flue gas volume, the smaller the circulation rate of the adsorption material in the moving bed adsorption tower.

[0023] Optionally, the circulation rate of the adsorbent material is M = Q.NOx / A NOx Among them, Q NOx NO in flue gas x mass flow rate, A NOx The adsorption material for NO at the flue gas temperature T x saturated adsorption capacity;

[0024] And / or, the circulation rate of the adsorbent material is M = Q SO2 / A SO2 Among them, Q SO2 Let A be the mass flow rate of SO2 in the flue gas. SO2 The saturated adsorption capacity of the adsorbent material for SO2 at the flue gas temperature T is given.

[0025] The adsorption capacity of the adsorbent material can be determined based on the mass flow rate of SO2 in the flue gas and the saturated adsorption capacity of the adsorbent material for SO2 at the flue gas temperature T. Alternatively, it can be determined based on the NO content in the flue gas. x The adsorption material for NO at mass flow rate and flue gas temperature T x The saturated adsorption capacity can be determined based on the mass flow rate of SO2 in the flue gas, the saturated adsorption capacity of the adsorbent material for SO2 at the flue gas temperature T, and the NO content in the flue gas. x The adsorption material for NO at mass flow rate and flue gas temperature T x The saturated adsorption capacity is determined, and the circulation rate of the adsorption material is also determined.

[0026] Optionally, a chiller is installed at the top of the moving bed adsorption tower to regulate the temperature of the flue gas.

[0027] This invention regulates the temperature of flue gas inside a moving bed adsorption tower by installing a chiller at the top of the tower, and adjusts the flue gas temperature differently by adjusting the cooling power of the chiller. Attached Figure Description

[0028] Figure 1 This is a schematic flowchart of the adsorption treatment method for flue gas desulfurization and denitrification according to an embodiment of the present invention.

[0029] Figure 2 The adsorption material of this invention reacts with NO at different temperatures in different embodiments. x A schematic diagram of the saturated adsorption curve of SO2. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] like Figure 1As shown, the adsorption treatment method for flue gas desulfurization and denitrification according to an embodiment of the present invention includes:

[0032] Measurement of NO in flue gas x The volume ratio x of SO2;

[0033] According to the NO in the flue gas x The volume ratio x of SO2 and the pre-obtained adsorption material for NO at different temperatures x The saturated adsorption curve of SO2 is used to determine the flue gas temperature T that needs to be controlled.

[0034] The flue gas temperature is adjusted to temperature T, and the flue gas is adsorbed using the adsorption material.

[0035] It should be noted that, within the normal flue gas temperature range, the adsorption material effectively removes NO from the flue gas. x The adsorption capacity of adsorbents for SO2 is limited. To achieve near-zero emissions from coal-fired flue gas, a large amount of adsorption material is needed. Moreover, the adsorption material's effectiveness against NO2 is limited within the normal flue gas temperature range. x Unlike SO2, the adsorption capacity of some adsorbents differs, resulting in most adsorbent materials being in an unsaturated state. For example, some adsorbent materials are less effective against NO. x The adsorption is saturated, but not for SO2; or, some adsorbent materials are saturated for SO2 but not for NO. x The adsorption is unsaturated, or there may be issues with the adsorption material's ability to absorb NO. x In cases where adsorption is unsaturated, including SO2 adsorption, the adsorption material cannot simultaneously adsorb NO. x The fact that the adsorption of SO2 reaches adsorption saturation is the direct reason why a large amount of adsorption material is needed, and the adsorption material adsorbs NO. x After reacting with SO2, the adsorbent needs to be regenerated in a regeneration tower. During the regeneration process, the adsorbent material is also prone to damage, which further increases the amount of adsorbent material used.

[0036] The flue gas desulfurization and denitrification adsorption treatment method of this invention, through the adsorption of NO in the flue gas... x The volume ratio x of NO to SO2 was determined, and then different flue gas temperatures T were applied to different volume ratios x. By adjusting the flue gas temperature, the adsorption effect of the adsorbent material on NO was changed. x The adsorption capacity of SO2 makes the adsorption material effective against NO. x While saturating with adsorption, SO2 is also saturated, so as to reduce the amount of adsorption material used and achieve near-zero emissions of coal-fired flue gas.

[0037] Adsorption materials for NO at different temperatures x Unlike SO2, the adsorption capacity of the adsorption material is different for NO. xThe adsorption capacity of the adsorbent and the sensitivity of the adsorption capacity of the adsorbent material to SO2 to temperature are different, resulting in different NO concentrations in the flue gas. x Unlike SO2, which requires temperature adjustment based on volume ratio, the adsorption material adjusts for different NO volume ratios depending on the flue gas temperature. x It adsorbs SO2, allowing the adsorption material to adsorb NO. x Simultaneously with saturation, the adsorption of SO2 also reaches saturation. This means that adjusting the flue gas temperature can increase the adsorption capacity of the adsorbent material for NO in the flue gas. x The adsorption capacity of both NO and SO2 allows the adsorption material to simultaneously adsorb NO and SO2. x To reduce the amount of adsorption material used, SO2 adsorption should be saturated.

[0038] In this invention, by adjusting the flue gas temperature to the required temperature, ozone is not added to the flue gas. Lower-order oxides can be oxidized to higher-order oxides under low-temperature conditions. Furthermore, the flue gas temperature in this embodiment can be between 80°C and -20°C. Simultaneously, under these temperature conditions, the adsorption material adsorbs oxides in the flue gas, improving the adsorption material's ability to adsorb NO. x The adsorption capacity of SO2 allows the adsorption material to adsorb NO. x It can adsorb SO2 to saturation, thereby improving the purification effect.

[0039] Because the amount of adsorbent material used is reduced, the amount of regenerated adsorbent material also decreases, and the wear of adsorbent material is reduced, further reducing the amount of adsorbent material used. The reduction in the amount of adsorbent material used also reduces the adsorption cost of coal-fired flue gas.

[0040] As the flue gas temperature decreases, the adsorption capacity of the adsorption material increases, but the adsorption capacity of the adsorption material for NO in the flue gas also decreases. x The increase in adsorption capacity is different from the increase in adsorption capacity for SO2. By adjusting the flue gas temperature, the adsorption capacity of the adsorbent material for S and N in the flue gas can be increased.

[0041] In some embodiments, the processing method further includes: removing NO from the flue gas. x The volume ratio x of SO2 is monitored periodically to adjust the flue gas temperature.

[0042] The batches of feedstock used in coal-fired power plants can change, leading to variations in NO in the flue gas. x SO2 will also change. In this embodiment of the invention, NO in the flue gas during the adsorption process... x The volume ratio of NO to SO2 is monitored in real time, and the NO content is adjusted based on the real-time monitoring data. x The volume ratio of NO to SO2 is adjusted to control the flue gas temperature so that the adsorption capacity of the adsorbent material is better matched to the NO in the flue gas. xThe volume ratio of SO2 to adsorbent increases the adsorption capacity of the adsorbent material, thereby reducing the amount of adsorbent material used.

[0043] In some embodiments, the adsorbent material is activated carbon.

[0044] Specifically, activated carbon is a very small carbon particle with a large number of pores and surface area. Compared with other adsorbent materials, activated carbon has a stronger adsorption capacity. Using activated carbon as an adsorbent material can reduce the amount of adsorbent material used compared with other adsorbent materials.

[0045] Moreover, activated carbon is relatively inexpensive, and using it as an adsorption material can reduce adsorption costs to some extent.

[0046] It is understood that the embodiments of the present invention do not limit the adsorption material to activated carbon. For example, molecular sieves, MOFs, mordenite, carbon cloth, carbon nanotubes, etc. can also be used. The use of activated carbon in the embodiments of the present invention can reduce the adsorption treatment cost of flue gas desulfurization and denitrification.

[0047] In some embodiments, such as Figure 2 As shown, the NO in the flue gas x The volume ratio x of SO2 and the flue gas temperature T to be controlled satisfy the following relationship: T = -43.00 - 28.84 * ln(x + 0.0056).

[0048] This invention provides an embodiment of obtaining NO in flue gas through experiments. x The relationship between the volume ratio x of SO2 and the flue gas temperature T to be controlled is used to adjust the flue gas temperature T so that the adsorbent material can withstand different NO2 concentrations. x The volume ratio x of SO2 can maintain a better adsorption capacity, thereby reducing the amount of adsorption material used.

[0049] It should be noted that the experiments in the embodiments of the present invention obtained the NO content of activated carbon as an adsorption material in different flue gases. x The volume ratio x of SO2 to NO reaches x The flue gas temperature T that needs to be controlled when SO2 adsorption is saturated is also considered. When other adsorption materials are used, curves and relationships can be obtained through experiments on these materials. Specifically, the adsorption effect of the adsorption material on NO2 can be measured. x The saturated adsorption capacity of SO2 and NO x Using the volume ratio x of SO2 as the X-axis and the flue gas temperature T to be controlled as the Y-axis, the adsorption material's curve is obtained, and the NO content of the adsorption material in different flue gases is calculated. x The flue gas temperature corresponding to the volume ratio x of SO2.

[0050] In some embodiments, when NO in the flue gas xWhen the volume ratio of flue gas to SO2 is 0 < x < 0.03, the flue gas temperature is adjusted to 50℃ < T ≤ 80℃.

[0051] When the flue gas contains NO x When the volume ratio of flue gas to SO2 is 0.03 ≤ x < 0.07, the flue gas temperature is adjusted to 20℃ < T ≤ 50℃.

[0052] When the flue gas contains NO x When the volume ratio of flue gas to SO2 is 0.07 ≤ x < 0.15, the flue gas temperature is adjusted to 10℃ < T ≤ 20℃.

[0053] When the flue gas contains NO x When the volume ratio of flue gas to SO2 is 0.15 ≤ x < 0.23, the flue gas temperature is adjusted to 0℃ < T ≤ 10℃.

[0054] When the flue gas contains NO x When the volume ratio of flue gas to SO2 is 0.23 ≤ x < 0.32, the flue gas temperature is adjusted to -10℃ < T ≤ 0℃.

[0055] When the flue gas contains NO x When the volume ratio of flue gas to SO2 is 0.32 ≤ x < 0.5, the flue gas temperature is adjusted to -20℃ < T ≤ -10℃.

[0056] When the flue gas contains NO x When the volume ratio of SO2 to x is ≥ 0.5, the flue gas temperature T is adjusted to -20℃.

[0057] The flue gas desulfurization and denitrification adsorption treatment method of this invention uses NO in flue gas at different volume ratios for adsorption treatment. x Different temperature ranges are set for NO compared to SO2, but the overall temperature range follows NO. x The higher the volume ratio of NO to SO2, the lower the required flue gas temperature. x When the volume ratio of SO2 to SO2 is greater than or equal to 0.5, the flue gas temperature is adjusted to -20℃. Considering that the lower the flue gas temperature is, the more cooling is required and the greater the energy consumption, and the flue gas temperature cannot be lowered indefinitely, -20℃ is set as the minimum temperature to avoid excessive cooling consumption and thus control the adsorption cost.

[0058] Furthermore, the flue gas desulfurization and denitrification adsorption treatment method of this invention gradually adjusts the flue gas temperature so that the NO in the flue gas... x When the volume ratio of flue gas to SO2 flues within a certain range, the flue gas temperature is also controlled within a certain temperature range, which avoids the need for real-time adjustment of the flue gas temperature and also reduces the difficulty of adjusting the flue gas temperature.

[0059] In some embodiments, NO in the flue gas x Or the SO2 content does not exceed 4000 ppm.

[0060] Specifically, NO in flue gas x The content of NO in the flue gas does not exceed 4000 ppm, and the content of SO2 in the flue gas does not exceed 4000 ppm. x Or when the SO2 content exceeds 4000 ppm, the NO in the flue gas x If the SO2 content is too high, the adsorption effect of the adsorbent will be affected.

[0061] In some embodiments, the adsorption treatment is carried out in a moving bed adsorption tower.

[0062] The adsorption process of the flue gas desulfurization and denitrification adsorption treatment method in this embodiment of the invention is carried out in a moving bed adsorption tower. During the adsorption process in the moving bed adsorption tower, the adsorbent material follows the airflow to complete the adsorption, and the adsorption effect of the adsorbent material is better. The adsorbent material is loaded from the top of the moving bed adsorption tower, and the adsorbent material that has completed adsorption flows out from the bottom of the moving bed adsorption tower and enters the regeneration tower for regeneration and circulation.

[0063] In some embodiments, the circulation rate of the adsorbent material in the moving bed adsorption tower is determined based on the saturated adsorption capacity of the adsorbent material and the flue gas volume.

[0064] The circulating amount of adsorbent material loaded at the top of the moving bed adsorption tower in this embodiment of the invention is determined comprehensively based on the saturated adsorption capacity of the adsorbent material and the flue gas volume, so that the adsorbent material in the moving bed adsorption tower can effectively adsorb NO in the flue gas. x This allows for the full adsorption of SO2, ensuring the adsorption effect of the adsorption material while reducing the amount of adsorption material used.

[0065] In this embodiment of the invention, the circulation rate of the adsorbent material is correlated with the flue gas volume. The larger the flue gas volume, the larger the circulation rate of the adsorbent material in the moving bed adsorption tower; the smaller the flue gas volume, the smaller the circulation rate of the adsorbent material in the moving bed adsorption tower.

[0066] In some embodiments, the circulation rate of the adsorbent material is M = Q NOx / A NOx Among them, Q NOx NO in flue gas x mass flow rate, A NOx The adsorption material for NO at the flue gas temperature T x saturated adsorption capacity;

[0067] And / or, the circulation rate of the adsorbent material is M = Q SO2 / A SO2 Among them, Q SO2Let A be the mass flow rate of SO2 in the flue gas. SO2 The saturated adsorption capacity of the adsorbent material for SO2 at the flue gas temperature T is given.

[0068] The adsorption capacity of the adsorbent material can be determined based on the mass flow rate of SO2 in the flue gas and the saturated adsorption capacity of the adsorbent material for SO2 at the flue gas temperature T. Alternatively, it can be determined based on the NO content in the flue gas. x The adsorption material for NO at mass flow rate and flue gas temperature T x The saturated adsorption capacity can be determined based on the mass flow rate of SO2 in the flue gas, the saturated adsorption capacity of the adsorbent material for SO2 at the flue gas temperature T, and the NO content in the flue gas. x The adsorption material for NO at mass flow rate and flue gas temperature T x The saturated adsorption capacity is determined, and the circulation rate of the adsorption material is also determined.

[0069] For example, when the flue gas temperature T is low, the adsorbent material is effective against NO. x The saturated adsorption capacity is 100 mg NO / g, and the NO in the flue gas x If the flow rate is 50 mg / min, then the circulation rate of the adsorbent material is 50 / 100 = 0.5 g / min.

[0070] In some embodiments, a chiller is provided at the top of the moving bed adsorption tower to regulate the temperature of the flue gas.

[0071] In this embodiment of the invention, a chiller is installed at the top of the moving bed adsorption tower to regulate the temperature of the flue gas inside the tower. The flue gas temperature is adjusted by changing the cooling power of the chiller.

[0072] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0073] Example 1

[0074] The flue gas from a coal-fired power plant contained 1000 ppm SO2 and NO2. x The content was 10 ppm, and the NO in the flue gas was measured. x The volume ratio of flue gas to SO2 is x, x = 0.01, the temperature of the flue gas entering the moving bed adsorption tower is 150℃, and the flue gas flow rate is 1000 Nm³. 3 / h, calculated NO in flue gas x The flow rate is 0.01 Nm. 3 / h;

[0075] According to NO in flue gas x The volume ratio of NO to SO2 was 0.01, and pre-prepared activated carbon was used to treat NO at different temperatures. x The saturated adsorption curve of SO2 indicates that the flue gas temperature T to be controlled is 80℃.

[0076] The flue gas temperature is adjusted to 80℃ by a refrigeration unit installed at the top of the moving bed adsorption tower, according to NO x The saturated adsorption curves of activated carbon were obtained to assess its adsorption capacity for NO at a flue gas temperature of 80℃. x The saturated adsorption capacity is 0.11 mL / g, and the circulation rate of activated carbon in the moving bed adsorption tower is calculated to be 89.29 kg / h. Activated carbon is used to adsorb and treat flue gas.

[0077] Real-time monitoring of NO in flue gas during activated carbon adsorption process x The volume ratio x of SO2 is determined, and the flue gas temperature is adjusted by a chiller based on the real-time monitored volume ratio x.

[0078] The activated carbon in this embodiment effectively removes NO from the flue gas. x After adsorption of SO2, the SO2 content in the outlet flue gas is 1 ppm, and NO... x The content is 1 ppm.

[0079] Example 2

[0080] The flue gas from a coal-fired power plant contained 1000 ppm SO2 and NO2. x The content was 70 ppm, and the NO in the flue gas was measured. x The volume ratio of SO2 to SO2 is x, x = 0.07, the temperature of the flue gas entering the moving bed adsorption tower is 50℃, and the flue gas flow rate is 1000 Nm³. 3 / h, calculated NO in flue gas x The flow rate is 0.07 Nm. 3 / h;

[0081] According to NO in flue gas x The volume ratio of NO to SO2 was 0.07, and pre-prepared activated carbon was used to treat NO at different temperatures. x The saturated adsorption curve of SO2 indicates that the flue gas temperature T to be controlled is 20℃.

[0082] The flue gas temperature is adjusted to 20°C by a refrigeration unit installed at the top of the moving bed adsorption tower, according to NO x The saturated adsorption curves of activated carbon were obtained to assess its adsorption capacity for NO at a flue gas temperature of 20℃. x The saturated adsorption capacity is 1.86 mL / g, and the circulation rate of activated carbon in the moving bed adsorption tower is calculated to be 37.65 kg / h. Activated carbon is used to adsorb and treat flue gas.

[0083] Real-time monitoring of NO in flue gas during activated carbon adsorption process x The volume ratio x of SO2 is determined, and the flue gas temperature is adjusted by a chiller based on the real-time monitored volume ratio x.

[0084] The activated carbon in this embodiment effectively removes NO from the flue gas. x After adsorption of SO2, the SO2 content in the outlet flue gas is 1 ppm, and NO... x The content is 1 ppm.

[0085] Example 3

[0086] The flue gas from a coal-fired power plant contained 1000 ppm SO2 and NO2. x The content was 200 ppm, and the NO in the flue gas was measured. x The volume ratio of SO2 to SO2 is x, x = 0.23, the temperature of the flue gas entering the moving bed adsorption tower is 50℃, and the flue gas flow rate is 1000 Nm³. 3 / h, calculated NO in flue gas x The flow rate is 0.2 Nm. 3 / h;

[0087] According to NO in flue gas x The volume ratio of SO2 to NO was 0.23, and the pre-prepared activated carbon was used to react with NO at different temperatures. x The saturated adsorption curve of SO2 indicates that the flue gas temperature T to be controlled is 0℃.

[0088] The flue gas temperature is adjusted to 0°C by a refrigeration unit installed at the top of the moving bed adsorption tower, according to NO x The saturated adsorption curves of activated carbon were obtained to assess its adsorption capacity for NO at a flue gas temperature of 0℃. x The saturated adsorption capacity is 13.08 mL / g, and the circulation rate of activated carbon in the moving bed adsorption tower is calculated to be 15.29 kg / h. Activated carbon is used to adsorb and treat flue gas.

[0089] Real-time monitoring of NO in flue gas during activated carbon adsorption process x The volume ratio x of SO2 is determined, and the flue gas temperature is adjusted by a chiller based on the real-time monitored volume ratio x.

[0090] The activated carbon in this embodiment effectively removes NO from the flue gas. x After adsorption of SO2, the SO2 content in the outlet flue gas is 1 ppm, and NO... x The content is 1 ppm.

[0091] Example 4

[0092] The flue gas from a coal-fired power plant contained 1800 ppm SO2 and NO2. x The content was 900 ppm, and the NO in the flue gas was measured. x The volume ratio of SO2 to SO2 is x, x = 0.5, the temperature of the flue gas entering the moving bed adsorption tower is 50℃, and the flue gas flow rate is 1000 Nm³. 3 / h, calculated NO in flue gas x The flow rate is 0.9 Nm. 3 / h;

[0093] According to NO in flue gas x The volume ratio of SO2 to NO was 0.5, and pre-prepared activated carbon was used to react with NO at different temperatures. x The saturated adsorption curve of SO2 indicates that the flue gas temperature T to be controlled is -20℃.

[0094] The flue gas temperature is adjusted to -20°C by a refrigeration unit installed at the top of the moving bed adsorption tower, according to NO x The saturated adsorption curves of activated carbon were obtained to assess its adsorption capacity for NO at a flue gas temperature of -20℃. x The saturated adsorption capacity is 53.46 mL / g, and the circulation rate of activated carbon in the moving bed adsorption tower is calculated to be 16.83 kg / h. Activated carbon is used to adsorb and treat flue gas.

[0095] Real-time monitoring of NO in flue gas during activated carbon adsorption process x The volume ratio x of SO2 is determined, and the flue gas temperature is adjusted by a chiller based on the real-time monitored volume ratio x.

[0096] The activated carbon in this embodiment effectively removes NO from the flue gas. x After adsorption of SO2, the SO2 content in the outlet flue gas is 1 ppm, and NO... x The content is 1 ppm.

[0097] Comparative Example 1

[0098] Comparative Example 1 used the same flue gas and treatment method as Example 1, except that the flue gas temperature was adjusted to 80°C and the circulation rate of the adsorbent material was 50 kg / h. After treatment, the outlet flue gas contained 200 ppm sulfur (S) and 6 ppm nitrogen (N).

[0099] Comparative Example 2

[0100] Comparative Example 2 used the same flue gas and treatment method as Example 1, except that the flue gas temperature was adjusted to 100°C and the circulation rate of the adsorbent material was 89.29 kg / h. After treatment, the outlet flue gas contained 315 ppm sulfur (S) and 8 ppm nitrogen (N).

[0101] Comparative Example 3

[0102] Comparative Example 3 used the same flue gas and treatment method as Example 3, except that the flue gas temperature was adjusted to 0°C and the circulation rate of the adsorbent material was 5 kg / h. After treatment, the outlet flue gas contained 422 ppm sulfur (S) and 121 ppm nitrogen (N).

[0103] Comparative Example 4

[0104] Comparative Example 4 used the same flue gas and treatment method as Example 1, except that the flue gas temperature was adjusted to 15°C and the circulation rate of the adsorbent material was 15.29 kg / h. After treatment, the outlet flue gas contained 12 ppm sulfur (S) and 351 ppm nitrogen (N).

[0105] Comparative Example 5

[0106] Comparative Example 5 used the same flue gas and treatment method as Example 1, except that the flue gas temperature was adjusted to -20°C and the circulation rate of the adsorbent material was 89.29 kg / h. After treatment, the outlet flue gas contained 1 ppm of sulfur (S) and 1 ppm of nitrogen (N).

[0107] The method of this invention is based on NO in flue gas x By adjusting the volume ratio of NO to SO2 and setting different adsorption temperatures, the adsorption material's ability to adsorb NO can be improved. x Both SO2 and other gases reach adsorption saturation, and the treated flue gas can basically achieve zero emissions. At the same time, it effectively reduces the amount of adsorption material used, and it also eliminates the need for low-temperature adsorption treatment below -20℃ for all flue gas, saving cooling energy and controlling adsorption costs.

[0108] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0109] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0110] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0111] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0112] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0113] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flue gas desulfurization and denitrification adsorption treatment method characterized by, The application relates to a method for treating flue gas, comprising: Determination of the volume ratio x of NO x and SO2 in flue gas from the volume ratio x of NO x and SO2 in the flue gas and the previously acquired saturation adsorption curves of the adsorbent material at different temperatures for NO x and SO2, the flue gas temperature T to be controlled is determined. adjusting the temperature of the flue gas to a temperature T, and performing adsorption treatment on the flue gas by using the adsorption material; The volume ratio x of NO x and SO2 in the flue gas satisfies the relationship: T = -43.00 - 28.84*ln(x + 0.0056) with the flue gas temperature T to be controlled.

2. The flue gas desulfurization and denitrification adsorption treatment method according to claim 1, characterized by, The treatment method further comprises monitoring the volume ratio x of NO x and SO2 in the flue gas in time to adjust the flue gas temperature.

3. The flue gas desulfurization and denitrification adsorption treatment method according to claim 2, characterized by, the adsorption material is activated carbon.

4. The flue gas desulfurization and denitrification adsorption treatment method according to claim 3, characterized by when the volume ratio of NO x when the volume ratio of NO and SO2 is 0 < x < 0.03, the flue gas temperature is adjusted to 50°C < T < 80°C; when the volume ratio of NO x when the volume ratio of NO and SO2 is 0.03≤x<0.07, adjusting the temperature of the flue gas to 20℃<T≤50℃; when the volume ratio of NO x when the volume ratio of NO and SO2 is 0.07≤x<0.15, the flue gas temperature is adjusted to 10℃<T≤20℃; when the volume ratio of NO x when the volume ratio of NO and SO2 is 0.15≤x<0.23, the flue gas temperature is adjusted to 0°C when the volume ratio of NO x when the volume ratio of NO and SO2 is 0.23≤x<0.32, the flue gas temperature is adjusted to -10℃<T≤0℃; when the volume ratio of NO x when the volume ratio of NO and SO2 is 0.32≤x<0.5, the flue gas temperature is adjusted to -20℃<T≤-10℃; when the volume ratio of NO x when the volume ratio of NO and SO2 is x > 0.5, the flue gas temperature T is adjusted to -20°C.

5. The flue gas desulfurization and denitrification adsorptive treatment method according to claim 1, characterized by the content of NO x or SO2 in the flue gas is not more than 4000 ppm.

6. The flue gas desulfurization and denitrification adsorptive treatment method according to claim 1, characterized by The adsorption treatment is performed in a moving bed adsorption tower.

7. The flue gas desulfurization and denitrification adsorption treatment method according to claim 6, characterized by, The circulating amount of the adsorption material in the moving bed adsorption tower is determined according to the saturated adsorption amount of the adsorption material and the flue gas amount.

8. The flue gas desulfurization and denitrification adsorption treatment method according to claim 7, characterized by, The circulating amount M of the adsorbent material = Q NOx / A NOx , wherein Q NOx is the mass flow of NO x in the flue gas, and A NOx is the saturated adsorption amount of the adsorbent material for NO x at the flue gas temperature T; and / or, the circulation amount M of the adsorbent material = Q SO2 / A SO2 , wherein Q SO2 is the mass flow of SO2 in the flue gas, A SO2 is the saturated adsorption amount of SO2 of the adsorbent material at the flue gas temperature T.

9. The flue gas desulfurization and denitrification adsorption treatment method according to claim 6, characterized by, A refrigerator is arranged at the top of the moving bed adsorption tower to adjust the temperature of the flue gas.

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