Adsorption treatment method for flue gas desulfurization and denitrification

Abstract

The invention relates to the technical field of flue gas treatment, in particular to a flue gas desulfurization and denitrification adsorption treatment method which comprises the following steps: measuring the volume ratio x of NOx to SO2 in flue gas; according to the volume ratio x of the NOx to the SO2 in the flue gas and a pre-obtained saturation adsorption curve of the adsorption material to the NOx and the SO2 at different temperatures, determining a flue gas temperature T needing to be controlled; and adjusting the temperature of the flue gas to the temperature T, and performing adsorption treatment on the flue gas by adopting the adsorption material. According to the adsorption treatment method for flue gas desulfurization and denitrification disclosed by the invention, near-zero emission of coal-fired flue gas can be realized while the consumption of the adsorption material is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas treatment, and in particular to an adsorption treatment method for flue gas desulfurization and denitrification. Background Art

[0002] Coal-fired power plants emit large amounts of SO2 and NO through coal-fired flue gas. x Particulate pollutants, particulate pollutants in coal-fired flue gas are one of the important factors causing air pollution. Particulate pollutants in gas flue gas are mostly adsorbed by moving bed adsorption towers to achieve near-zero emissions of coal-fired flue gas. However, in related technologies, when pollutants in flue gas are adsorbed by adsorption materials in moving bed adsorption towers, a large amount of adsorption materials are needed to achieve near-zero emissions of coal-fired flue gas. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the present invention proposes an adsorption treatment method for flue gas desulfurization and denitrification, which can achieve near-zero emission 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 by the present invention comprises:

[0005] Determination of NO in flue gas x and SO2 volume ratio x;

[0006] According to the NO in flue gas x The volume ratio x of SO2 and the adsorption of NO2 by the pre-obtained adsorbent material at different temperatures x The flue gas temperature T that needs to be controlled is determined by the saturated adsorption curve of SO2;

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

[0008] The flue gas desulfurization and denitrification adsorption treatment method proposed by the present invention is to remove NO in the flue gas. x The volume ratio x of SO2 is measured, and then different flue gas temperatures T are used for different volume ratios x. By adjusting the flue gas temperature, the adsorption of NO by the adsorbent material is changed. x and SO2 adsorption capacity, making the adsorption material for NO x When the adsorption is saturated, the SO2 adsorption is saturated at the same time, so as to reduce the amount of adsorption material used and achieve near-zero emission of coal-fired flue gas.

[0009] Optionally, the treatment method further comprises: treating NO in the flue gas x The volume ratio x of SO2 is monitored regularly to adjust the flue gas temperature.

[0010] The flue gas desulfurization and denitrification adsorption treatment method of the present invention is to adsorb NO in the flue gas during the adsorption process. x The volume ratio of NO and SO2 is monitored in real time, and the x The flue gas temperature is adjusted according to the volume ratio of SO2 to make the adsorption capacity of the adsorbent material more compatible with the NO in the flue gas. x The volume ratio of SO2 can increase the adsorption capacity of the adsorbent material to reduce the amount of adsorbent material used.

[0011] Optionally, the adsorption 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 adsorption materials, activated carbon has a stronger adsorption capacity. Using activated carbon as an adsorption material can reduce the amount of adsorption material used compared to using other adsorption 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 satisfies the relationship: T = -43.00-28.84*ln(x+0.0056).

[0014] The adsorption treatment method for flue gas desulfurization and denitrification of the present invention obtains NO in flue gas through experiments. x The relationship between the volume ratio x of NO and SO2 and the flue gas temperature T to be controlled is that the adsorption material is adjusted under different NO x The volume ratio x to 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 flue gas contains NO 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 flue gas contains NO 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 flue gas contains NO 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 flue gas contains NO 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 flue gas contains NO 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 flue gas contains NO xWhen the volume ratio of SO2 is x≥0.5, the flue gas temperature T is adjusted to -20°C.

[0016] The flue gas desulfurization and denitrification adsorption treatment method of the present invention is to treat NO with different volume ratios in the flue gas. x Set different temperature ranges from SO2, and follow NO x The larger the volume ratio of NO to SO2, the lower the flue gas temperature needs to be set. x When the volume ratio of SO2 is greater than or equal to 0.5, the flue gas temperature is adjusted to -20℃. Considering that when the flue gas temperature is lowered, the lower the flue gas temperature is, the more cooling capacity is required and the greater the energy consumption is, the flue gas temperature cannot be lowered indefinitely. -20℃ is set as the lowest adjustment temperature to avoid excessive cooling capacity consumption and thus control the adsorption cost.

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

[0018] When NO in flue gas x When the content of SO2 exceeds 4000ppm, the NO x Or 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 adsorption treatment method for flue gas desulfurization and denitrification of the present invention is carried out in a moving bed adsorption tower. During the adsorption process of the moving bed adsorption tower, the adsorption material follows the flow of the airflow to complete the adsorption, and the adsorption effect of the adsorption material is better. The adsorption material is loaded from the top of the moving bed adsorption tower, and the adsorbed adsorption material flows out from the bottom of the moving bed adsorption tower and enters the regeneration tower for regeneration cycle.

[0021] Optionally, the circulation 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 amount of flue gas.

[0022] The circulating amount of the adsorbent material loaded on the top of the moving bed adsorption tower is determined comprehensively according to the saturated adsorption amount of the adsorbent material and the flue gas volume, so that the adsorbent material in the moving bed adsorption tower can absorb NO in the flue gas. x Or SO2 is fully adsorbed, ensuring the adsorption effect of the adsorption material while reducing the amount of adsorption material. Moreover, by associating the circulation amount of the adsorption material with the flue gas volume, the larger the flue gas volume, the larger the circulation amount of the adsorption material in the moving bed adsorption tower, and the smaller the flue gas volume, the smaller the circulation amount of the adsorption material in the moving bed adsorption tower.

[0023] Optionally, the circulation amount of the adsorption material M=QNOx / A NOx , where Q NOx NO in flue gas x The mass flow rate, A NOx is the adsorption capacity of the adsorbent material to NO at the flue gas temperature T x Saturated adsorption capacity;

[0024] And / or, the circulation amount of the adsorption material M=Q SO2 / A SO2 , where Q SO2 is the mass flow rate of SO2 in flue gas, A SO2 It is the saturated adsorption capacity of SO2 by the adsorption material at the flue gas temperature T.

[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, or based on the NO x The adsorption of NO by the adsorbent material under the mass flow rate and flue gas temperature T x The saturated adsorption capacity can also be determined based on the mass flow of SO2 in the flue gas and the saturated adsorption capacity of the adsorption material for SO2 at the flue gas temperature T, as well as the saturated adsorption capacity of NO in the flue gas. x The adsorption of NO by the adsorbent material under the mass flow rate and flue gas temperature T x The saturated adsorption capacity and the circulation amount of the adsorption material are determined at the same time.

[0026] Optionally, a refrigerator is provided on the top of the moving bed adsorption tower to adjust the temperature of the flue gas.

[0027] The present invention adjusts the flue gas temperature in the moving bed adsorption tower by arranging a refrigerator on the top of the moving bed adsorption tower, and adjusts the flue gas temperature differently by adjusting the refrigeration power of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 2 The adsorption of NO by the adsorbent of the embodiment of the present invention at different temperatures x Schematic diagram of the saturation adsorption curve of SO2. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood 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] Determination of NO in flue gas x and SO2 volume ratio x;

[0033] According to the NO in flue gas x The volume ratio x of SO2 and the adsorption of NO2 by the pre-obtained adsorbent material at different temperatures x The flue gas temperature T that needs to be controlled is determined by the saturated adsorption curve of SO2;

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

[0035] It should be noted that under the normal flue gas temperature range, the adsorption of NO in flue gas by the adsorbent material is x The adsorption capacity of NO and SO2 is limited. If you want to achieve near-zero emissions of coal-fired flue gas, you need to use a lot of adsorption materials. Moreover, the adsorption materials are very sensitive to NO in the normal flue gas temperature range. x Different from the adsorption capacity of SO2, most of the adsorbent materials are in an unsaturated state. For example, some adsorbent materials are not saturated for NO x The adsorption is saturated, but the adsorption of SO2 is not saturated, or some adsorption materials are saturated for SO2 adsorption, but not for NO x Adsorption is not saturated, or there may be adsorption of NO by the adsorbent material. x The adsorption is not saturated, and the adsorption of SO2 is not saturated at the same time. The adsorption material cannot adsorb NO x The adsorption saturation of SO2 is the direct reason why a large amount of adsorption material is needed, and the adsorption material adsorbs NO x After being separated from SO2, it needs to enter the regeneration tower for regeneration. During the recycling and regeneration process of the adsorbent, the adsorption material is also prone to damage, further increasing the amount of adsorption material used.

[0036] The flue gas desulfurization and denitrification adsorption treatment method of the embodiment of the present invention is to adsorb NO in the flue gas. x The volume ratio x of SO2 is measured, and then different flue gas temperatures T are used for different volume ratios x. By adjusting the flue gas temperature, the adsorption of NO by the adsorbent material is changed. x and SO2 adsorption capacity, making the adsorption material for NO x When the adsorption is saturated, the SO2 adsorption is saturated at the same time, so as to reduce the amount of adsorption material used and achieve near-zero emission of coal-fired flue gas.

[0037] Adsorption of NO by adsorbent materials at different temperatures x The adsorption capacity of NO is different from that of SO2, and the adsorption material is xThe adsorption capacity of the adsorbent and the adsorption capacity of the adsorbent material for SO2 have different sensitivities to temperature, resulting in different NO x The flue gas temperature that needs to be adjusted for the volume ratio of SO2 is different. The adsorption material adjusts the NO2 volume ratio according to the different flue gas temperatures. x and SO2, so that the adsorption material can adsorb NO x At the same time, the adsorption of SO2 is also saturated, that is, by adjusting the flue gas temperature, the adsorption of NO in the flue gas by the adsorption material is increased. x and SO2 adsorption capacity, making the adsorption material simultaneously x And SO2 adsorption saturation, reducing the amount of adsorption material.

[0038] In the present invention, by adjusting the flue gas temperature to the required temperature, it is not necessary to add ozone to the flue gas, and low-order oxides can be oxidized to high-order oxides under low temperature conditions. In addition, the flue gas temperature of the embodiment of the present invention can be between 80°C and -20°C. At the same time, under this temperature condition, the oxides in the flue gas are adsorbed by the adsorbent material, thereby increasing the adsorption capacity of the adsorbent material to NO. x and SO2 adsorption capacity, achieving adsorption of NO x And SO2 adsorption saturation, thereby improving the purification effect.

[0039] Since the amount of adsorbent material is reduced, the circulation amount of recycled adsorbent material will also be reduced, and the wear of adsorbent material will also be reduced, further reducing the amount of adsorbent material. The reduction in the amount of adsorbent material will also reduce the adsorption cost of coal-fired flue gas.

[0040] As the flue gas temperature decreases, the adsorption capacity of the adsorbent material increases, but the adsorbent material is more sensitive to NO in the flue gas. 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 adsorption material for S and N in the flue gas can be increased.

[0041] In some embodiments, the treatment method further comprises: treating NO in the flue gas x The volume ratio x of SO2 is monitored regularly to adjust the flue gas temperature.

[0042] The batches of raw materials in coal-fired power plants will change, and the NO in flue gas will x and SO2 will also change. In the embodiment of the present invention, NO in the flue gas during the adsorption process x The volume ratio of NO and SO2 is monitored in real time, and the x The flue gas temperature is adjusted according to the volume ratio of SO2 to make the adsorption capacity of the adsorbent material more compatible with the NO in the flue gas. xThe volume ratio of SO2 can increase the adsorption capacity of the adsorbent material to reduce 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 adsorption materials, activated carbon has a stronger adsorption capacity. Using activated carbon as an adsorption material can reduce the amount of adsorption material used compared with using other adsorption materials.

[0045] Moreover, the price of activated carbon is relatively low, and using activated carbon as adsorption material can also reduce the adsorption cost to a certain extent.

[0046] It is understandable that the embodiments of the present invention do not limit the adsorption material to activated carbon. For example, molecular sieves, MOF, 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, 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 satisfies the relationship: T = -43.00-28.84*ln(x+0.0056).

[0048] The embodiment of the present invention obtains NO in flue gas through experiments x The relationship between the volume ratio x of NO and SO2 and the flue gas temperature T to be controlled is that the adsorption material is adjusted under different NO x The volume ratio x to SO2 can maintain a better adsorption capacity, thereby reducing the amount of adsorption material used.

[0049] It should be noted that the experimental results of the embodiment of the present invention are for the adsorption of activated carbon in different flue gases. x The volume ratio of SO2 to NO is x. x When the adsorption is saturated and the adsorption of SO2 is saturated, the flue gas temperature T that needs to be controlled. When other adsorption materials are used, experiments can be conducted on other adsorption materials to obtain curves and relationship equations, specifically: Determine the adsorption of NO by the adsorption material x and SO2 saturation adsorption, and NO x The volume ratio x of SO2 is taken as the X-axis, and the flue gas temperature T to be controlled is taken as the Y-axis to obtain the curve of the adsorption material, and calculate the adsorption material in different flue gases. x The flue gas temperature corresponding to the volume ratio x of SO2.

[0050] In some embodiments, when the flue gas contains NO xWhen the volume ratio of 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 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 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 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 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 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 is x≥0.5, the flue gas temperature T is adjusted to -20°C.

[0057] The flue gas desulfurization and denitrification adsorption treatment method of the embodiment of the present invention is to treat NO in flue gas at different volume ratios. x Set different temperature ranges from SO2, and follow NO x The larger the volume ratio of NO to SO2, the lower the flue gas temperature needs to be set. x When the volume ratio of SO2 is greater than or equal to 0.5, the flue gas temperature is adjusted to -20℃. Considering that when the flue gas temperature is lowered, the lower the flue gas temperature is, the more cooling capacity is required and the greater the energy consumption is, the flue gas temperature cannot be lowered indefinitely. -20℃ is set as the lowest adjustment temperature to avoid excessive cooling capacity consumption and thus control the adsorption cost.

[0058] Moreover, the adsorption treatment method for flue gas desulfurization and denitrification of the embodiment of the present invention gradually adjusts the flue gas temperature, when the NO in the flue gas is x When the volume ratio of SO2 fluctuates within a certain range, the flue gas temperature is also controlled within a certain temperature range, which avoids real-time adjustment of the flue gas temperature and reduces the difficulty of adjusting the flue gas temperature.

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

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

[0061] In some embodiments, the adsorption process is performed in a moving bed adsorption tower.

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

[0063] In some embodiments, the circulation 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 amount of flue gas.

[0064] The circulating amount of the adsorbent material loaded on the top of the moving bed adsorption tower in the embodiment of the present invention is determined comprehensively according to the saturated adsorption amount of the adsorbent material and the flue gas volume, so that the adsorbent material in the moving bed adsorption tower can absorb NO in the flue gas. x Or SO2 is fully adsorbed, ensuring the adsorption effect of the adsorption material while reducing the amount of adsorption material used.

[0065] The embodiment of the present invention associates the circulation amount of the adsorption material with the flue gas volume. When the flue gas volume is larger, the circulation amount of the adsorption material in the moving bed adsorption tower is larger, and when the flue gas volume is smaller, the circulation amount of the adsorption material in the moving bed adsorption tower is smaller.

[0066] In some embodiments, the circulating amount of the adsorbent material M=Q NOx / A NOx , where Q NOx NO in flue gas x The mass flow rate, A NOx is the adsorption capacity of the adsorbent material to NO at the flue gas temperature T x Saturated adsorption capacity;

[0067] And / or, the circulation amount of the adsorption material M=Q SO2 / A SO2 , where Q SO2is the mass flow rate of SO2 in flue gas, A SO2 It is the saturated adsorption capacity of SO2 by the adsorption material at the flue gas temperature T.

[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, or based on the NO x The adsorption of NO by the adsorbent material under the mass flow rate and flue gas temperature T x The saturated adsorption capacity can also be determined based on the mass flow of SO2 in the flue gas and the saturated adsorption capacity of the adsorption material for SO2 at the flue gas temperature T, as well as the saturated adsorption capacity of NO in the flue gas. x The adsorption of NO by the adsorbent material under the mass flow rate and flue gas temperature T x The saturated adsorption capacity and the circulation amount of the adsorption material are determined at the same time.

[0069] For example, when the flue gas temperature is below T, the adsorption of NO by the adsorbent material x The saturated adsorption capacity is 100 mg NO / g. x If the flow rate is 50 mg / min, the circulation amount of the adsorbent material is 50 / 100=0.5 g / min.

[0070] In some embodiments, a refrigerator is disposed on the top of the moving bed adsorption tower to adjust the flue gas temperature.

[0071] In the embodiment of the present invention, a refrigerator is arranged on the top of the moving bed adsorption tower to adjust the flue gas temperature in the moving bed adsorption tower, and the flue gas temperature is adjusted differently by adjusting the refrigeration power of the refrigerator.

[0072] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0073] Example 1

[0074] The flue gas of a coal-fired power plant contains 1000ppm SO2 and 1000ppm NO x The content is 10ppm, measuring NO in flue gas x The volume ratio of 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 1000Nm 3 / h, after calculating the NO in flue gas x The flow rate is 0.01Nm 3 / h;

[0075] According to the NO in flue gas x The volume ratio of SO2 to NO was 0.01 and the activated carbon obtained beforehand was used to measure the NO at different temperatures. x The saturated adsorption curve of SO2 determines that the flue gas temperature T that needs to be controlled is 80℃;

[0076] The flue gas temperature is adjusted to 80°C by the refrigerator installed on the top of the moving bed adsorption tower. x The saturated adsorption curve of activated carbon for NO at a flue gas temperature of 80 °C was obtained. x The saturated adsorption capacity is 0.11 mL / g, and the circulation amount of activated carbon in the moving bed adsorption tower is calculated to be 89.29 kg / h. The flue gas is adsorbed by activated carbon.

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

[0078] The activated carbon in this example has been used to treat NO in flue gas. x After adsorption of SO2, the SO2 content in the outlet flue gas is 1ppm, NO x The content is 1ppm.

[0079] Example 2

[0080] The flue gas of a coal-fired power plant contains 1000ppm SO2 and 1000ppm NO x The content is 70ppm, and the NO in flue gas is measured x The volume ratio of SO2 is x, x = 0.07, the temperature of the flue gas entering the moving bed adsorption tower is 50 ° C, and the flue gas flow rate is 1000 Nm 3 / h, after calculating the NO in flue gas x The flow rate is 0.07Nm 3 / h;

[0081] According to the NO in flue gas x The volume ratio of SO2 to NO was 0.07 and the activated carbon obtained in advance was used at different temperatures. x The saturated adsorption curve of SO2 determines that the flue gas temperature T that needs to be controlled is 20℃;

[0082] The flue gas temperature is adjusted to 20°C by the refrigerator installed at the top of the moving bed adsorption tower. x The saturated adsorption curve of activated carbon for NO at a flue gas temperature of 20 °C was obtained. x The saturated adsorption capacity is 1.86 mL / g, and the circulation amount of activated carbon in the moving bed adsorption tower is calculated to be 37.65 kg / h. The flue gas is adsorbed by activated carbon.

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

[0084] The activated carbon in this example has been used to treat NO in flue gas. x After adsorption of SO2, the SO2 content in the outlet flue gas is 1ppm, NO x The content is 1ppm.

[0085] Example 3

[0086] The flue gas of a coal-fired power plant contains 1000ppm SO2 and 1000ppm NO x The content is 200ppm, measuring NO in flue gas x The volume ratio of SO2 is x, x = 0.23, the temperature of the flue gas entering the moving bed adsorption tower is 50 ° C, and the flue gas flow rate is 1000 Nm 3 / h, after calculating the NO in flue gas x The flow rate is 0.2Nm 3 / h;

[0087] According to the NO in flue gas x The volume ratio of SO2 to NO was 0.23 and the activated carbon obtained beforehand was used to measure the NO at different temperatures. x The saturated adsorption curve of SO2 determines that the flue gas temperature T that needs to be controlled is 0℃;

[0088] The flue gas temperature is adjusted to 0°C by the refrigerator installed at the top of the moving bed adsorption tower. x The saturated adsorption curve of activated carbon for NO at flue gas temperature 0℃ was obtained. x The saturated adsorption capacity is 13.08 mL / g, and the circulation amount of activated carbon in the moving bed adsorption tower is calculated to be 15.29 kg / h. The flue gas is adsorbed by activated carbon.

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

[0090] The activated carbon in this example has been used to treat NO in flue gas. x After adsorption of SO2, the SO2 content in the outlet flue gas is 1ppm, NO x The content is 1ppm.

[0091] Example 4

[0092] The flue gas of a coal-fired power plant contains 1800ppm SO2 and 1800ppm NO x The content is 900ppm, measuring NO in flue gas x The volume ratio of SO2 is x, x = 0.5, the temperature of the flue gas entering the moving bed adsorption tower is 50°C, and the flue gas flow rate is 1000Nm 3 / h, after calculating the NO in flue gas x The flow rate is 0.9Nm 3 / h;

[0093] According to the NO in flue gas x The volume ratio of SO2 to NO was 0.5 and the activated carbon obtained in advance was used for NO at different temperatures. x The saturated adsorption curve of SO2 determines that the flue gas temperature T that needs to be controlled is -20℃;

[0094] The flue gas temperature is adjusted to -20°C by the refrigerator installed at the top of the moving bed adsorption tower. x The saturated adsorption curve of activated carbon for NO at flue gas temperature of -20℃ was obtained. x The saturated adsorption capacity is 53.46 mL / g, and the circulation amount of activated carbon in the moving bed adsorption tower is calculated to be 16.83 kg / h. The flue gas is adsorbed by activated carbon.

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

[0096] The activated carbon in this example has been used to treat NO in flue gas. x After adsorption of SO2, the SO2 content in the outlet flue gas is 1ppm, NO x The content is 1ppm.

[0097] Comparative Example 1

[0098] The flue gas and treatment method used in Comparative Example 1 are the same as those in Example 1, except that the flue gas temperature is adjusted to 80°C and the circulation rate of the adsorbent material is 50 kg / h. After treatment, the S content in the outlet flue gas is 200 ppm and the N content is 6 ppm.

[0099] Comparative Example 2

[0100] The flue gas and treatment method used in Comparative Example 2 are the same as those in Example 1, except that the flue gas temperature is adjusted to 100°C and the circulation rate of the adsorbent material is 89.29 kg / h. After treatment, the S content in the outlet flue gas is 315 ppm and the N content is 8 ppm.

[0101] Comparative Example 3

[0102] The flue gas and treatment method used in Comparative Example 3 are the same as those in Example 3, except that the flue gas temperature is adjusted to 0°C and the circulation rate of the adsorbent material is 5 kg / h. After treatment, the S content in the outlet flue gas is 422 ppm and the N content is 121 ppm.

[0103] Comparative Example 4

[0104] The flue gas and treatment method used in Comparative Example 4 are the same as those in Example 1, except that the flue gas temperature is adjusted to 15°C and the circulation rate of the adsorbent material is 15.29 kg / h. After treatment, the S content in the outlet flue gas is 12 ppm and the N content is 351 ppm.

[0105] Comparative Example 5

[0106] The flue gas and treatment method used in Comparative Example 5 are the same as those in Example 1, except that the flue gas temperature is adjusted to -20°C and the circulation rate of the adsorption material is 89.29 kg / h. After treatment, the S content in the outlet flue gas is 1 ppm and the N content is 1 ppm.

[0107] The method of the embodiment of the present invention is based on NO in flue gas. x and SO2 volume ratio, set different adsorption temperatures to make the adsorption material more sensitive to NO x Both SO2 and SO2 reach adsorption saturation, and the treated flue gas can basically achieve zero emission. At the same time, the amount of adsorption material is effectively reduced, and there is no need to use low-temperature adsorption treatment below -20°C for the flue gas, which saves cooling capacity and realizes the control of adsorption cost.

[0108] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0109] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0110] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0111] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0112] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0113] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A flue gas desulfurization and denitrification adsorption treatment method, characterized in that: include: Determination of NO in flue gas x and SO2 volume ratio x; According to the NO in flue gas x The volume ratio x of SO2 and the adsorption of NO2 by the pre-obtained adsorbent material at different temperatures x The flue gas temperature T that needs 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 subjected to adsorption treatment using the adsorption material.

2. The adsorption treatment method for flue gas desulfurization and denitrification according to claim 1, characterized in that: The treatment method further comprises: treating NO in the flue gas x The volume ratio x of SO2 is monitored regularly to adjust the flue gas temperature.

3. The adsorption treatment method for flue gas desulfurization and denitrification according to claim 2, characterized in that: The adsorption material is activated carbon.

4. The adsorption treatment method for flue gas desulfurization and denitrification according to claim 3, characterized in that: The NO in the flue gas x The volume ratio x of SO2 and the flue gas temperature T to be controlled satisfies the relationship: T = -43.00-28.84*ln(x+0.0056).

5. The adsorption treatment method for flue gas desulfurization and denitrification according to claim 4, characterized in that: When the flue gas contains NO x When the volume ratio of SO2 is 0<x<0.03, the flue gas temperature is adjusted to 50℃<T≤80℃; When the flue gas contains NO x When the volume ratio of SO2 is 0.03≤x<0.07, the flue gas temperature is adjusted to 20℃<T≤50℃; When the flue gas contains NO x When the volume ratio of SO2 is 0.07≤x<0.15, the flue gas temperature is adjusted to 10℃<T≤20℃; When the flue gas contains NO x When the volume ratio of SO2 is 0.15≤x<0.23, the flue gas temperature is adjusted to 0℃<T≤10℃; When the flue gas contains NO x When the volume ratio of SO2 is 0.23≤x<0.32, the flue gas temperature is adjusted to -10℃<T≤0℃; When the flue gas contains NO x When the volume ratio of SO2 is 0.32≤x<0.5, the flue gas temperature is adjusted to -20℃<T≤-10℃; When the flue gas contains NO x When the volume ratio of SO2 is x≥0.5, the flue gas temperature T is adjusted to -20°C.

6. The adsorption treatment method for flue gas desulfurization and denitrification according to claim 1, characterized in that: The NO in the flue gas x Or the SO2 content does not exceed 4000ppm.

7. The adsorption treatment method for flue gas desulfurization and denitrification according to claim 1, characterized in that: The adsorption treatment is carried out in a moving bed adsorption tower.

8. The adsorption treatment method for flue gas desulfurization and denitrification according to claim 7, characterized in that: The circulation 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 amount of flue gas.

9. The adsorption treatment method for flue gas desulfurization and denitrification according to claim 8, characterized in that: The circulation amount of the adsorption material M=Q NOx / A NOx , where Q NOx NO in flue gas x The mass flow rate, A NOx is the adsorption capacity of NO by the adsorbent material at the flue gas temperature T x The saturated adsorption capacity; And / or, the circulation amount of the adsorption material M=Q SO2 / A SO2 , where Q SO2 is the mass flow rate of SO2 in flue gas, A SO2 It is the saturated adsorption capacity of SO2 by the adsorption material at the flue gas temperature T.

10. The adsorption treatment method for flue gas desulfurization and denitrification according to claim 7, characterized in that: A refrigerator is arranged on the top of the moving bed adsorption tower to adjust the temperature of the flue gas.

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