Low-temperature adsorption regeneration system capable of realizing deep peak regulation

Abstract

The invention relates to the technical field of boilers and discloses a low-temperature adsorption regeneration system capable of achieving deep peak shaving, the low-temperature adsorption regeneration system comprises a boiler, an oxygen conveying pipe, an adsorption tower, a regeneration tower and a nitrogen making machine, the boiler comprises a boiler body and a flue, the oxygen conveying pipe is arranged on the boiler body, and the outlet end of the oxygen conveying pipe extends into a hearth; the adsorption tower is provided with a flue gas inlet and a clean flue gas outlet, an adsorbent is arranged in the adsorption tower, the nitrogen outlet is communicated with the nitrogen inlet of the regeneration tower, and the oxygen outlet is communicated with an inlet of the oxygen conveying pipe. When the boiler operates in a low-load state, high-concentration oxygen introduced into the boiler through the oxygen conveying pipe plays a role in supporting combustion of pulverized coal, the phenomenon that the boiler flames out due to the poor stable combustion capacity of the pulverized coal in the low-load state is avoided, the boiler can operate under the rated load of 40% or even 30%, and the service life of the boiler is prolonged. And therefore, the boiler has a large adjusting space on the valley peak, and the deep peak regulation capacity is high.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to a low-temperature adsorption regeneration system capable of deep peak regulation. Background Art

[0002] Coal-fired flue gas contains a large amount of nitrogen oxides that affect the environment and human health. In the relevant technology, adsorbents are usually used to purify coal-fired flue gas by adsorption, that is, high-temperature flue gas, usually 200°C, is passed into an adsorption tower filled with adsorbents, and the nitrogen oxides in the flue gas are adsorbed by the adsorbent. This adsorption is usually called high-temperature adsorption. High-temperature adsorption has a poor adsorption and purification effect on flue gas and cannot achieve near-zero emissions. In addition, the adsorbent that has adsorbed nitrogen oxides is transported to a regeneration tower for heating and desorption to achieve regeneration of the adsorbent. The regenerated adsorbent is returned to the adsorption tower for adsorption and purification of the flue gas. The nitrogen oxides in the regenerated rich gas generated by the desorption of the adsorbent need to be subsequently treated, resulting in a complicated subsequent treatment process and high treatment costs. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0004] In order to overcome the problems existing in high-temperature adsorption, low-temperature adsorption technology for flue gas has been proposed in the relevant technology, that is, firstly, the high-temperature flue gas is passed into a spray cooling tower for cooling, and the temperature is reduced to, for example, low-temperature flue gas below room temperature, and then the low-temperature flue gas is input into the adsorption tower for low-temperature adsorption, and the adsorbent saturated with adsorption is sent to the regeneration tower for heating desorption regeneration, and the regenerated adsorbent is returned to the adsorption tower for recycling. In low-temperature adsorption, the adsorption capacity of the adsorbent is increased exponentially in a low-temperature environment, which greatly improves the adsorption purification rate compared with conventional high-temperature flue gas adsorption, and can achieve near-zero emissions of flue gas. In order to treat the regenerated rich gas, the relevant technology proposes to return the regenerated rich gas to the boiler for combustion, so as to simplify the subsequent processing procedures of the regenerated rich gas and reduce the processing cost of the regenerated rich gas.

[0005] However, the inventors found that when coal-fired units carry out deep peak regulation, the stable combustion ability of the boiler under low load is a prerequisite. When the regenerated rich gas returns to the boiler for combustion, it will affect the stable combustion ability of the boiler and reduce the deep peak regulation ability of the coal-fired unit. In addition, the current minimum operating load of most domestic coal-fired unit boilers is generally 40% to 50% of the rated load, which is still a certain distance away from the minimum deep regulation load required by the power grid to reach 30% to 35% of the rated load.

[0006] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present invention proposes a low-temperature adsorption regeneration system capable of deep peak regulation and having a strong deep peak regulation capability.

[0007] The low-temperature adsorption regeneration system capable of deep peak regulation of the present invention comprises a boiler, an oxygen supply pipe, an adsorption tower, a regeneration tower and a nitrogen generator, wherein the boiler comprises a furnace body and a flue, wherein the furnace body has a furnace, and the flue is connected to the furnace; the oxygen supply pipe is arranged on the furnace body and the outlet end of the oxygen supply pipe extends into the furnace, and is used to transport oxygen into the furnace; the adsorption tower has a flue gas inlet and a clean flue gas outlet, and the flue gas inlet is connected to the flue, and the adsorption tower has an adsorbent for adsorbing and purifying low-temperature flue gas below zero degrees into low-temperature clean flue gas; the regeneration tower is used to regenerate and analyze the adsorbent saturated with adsorption in the adsorption tower, and the regeneration tower has a regeneration rich gas outlet for discharging regeneration rich gas and a nitrogen inlet for introducing nitrogen; the nitrogen generator has a nitrogen outlet and an oxygen outlet, and the nitrogen outlet is connected to the nitrogen inlet of the regeneration tower, and the oxygen outlet is connected to the inlet of the oxygen supply pipe.

[0008] The low-temperature adsorption regeneration system capable of deep peak regulation of the present invention, when the boiler is operated at 100% rated load, the oxygen introduced into the boiler can be used for the full combustion of coal powder, which can not only improve the combustion efficiency of coal powder, but also realize the recycling of high-concentration oxygen tail gas generated by the nitrogen generator, which is beneficial to saving energy. When the boiler is operated at a low load, the high-concentration oxygen introduced into the boiler through the oxygen supply pipe plays a combustion-supporting role in the combustion of coal powder, avoiding the flameout of the boiler due to the poor stable combustion ability of coal powder under low load conditions, so that the boiler can be operated at 40% or even 30% rated load, thereby enabling the boiler to have a larger adjustment space on the valley peak and a stronger deep peak regulation capability.

[0009] Optionally, the low-temperature adsorption regeneration system capable of deep peak regulation of the present invention comprises a main pipeline, a first branch pipeline, a second branch pipeline and a first control valve, wherein the inlet of the main pipeline is connected to the oxygen outlet; the inlet of the first branch pipeline and the inlet of the second branch pipeline are both connected to the outlet of the main pipeline, and the outlet of the first branch pipeline is connected to the inlet of the oxygen supply pipe; the first control valve is arranged on the first branch pipeline, and is used to control the flow of oxygen entering the oxygen supply pipe.

[0010] The high-concentration oxygen discharged from the oxygen outlet of the nitrogen generator is divided into two paths. One path is passed through the first pipeline to the boiler for combustion support. The flow rate and pressure of the oxygen entering the boiler are adjusted by adjusting the opening of the first control valve, so that the flow rate and pressure of the oxygen entering the boiler are adapted according to the operating state of the boiler, ensuring the normal operation of the boiler, which is conducive to improving the operating reliability of the boiler. The other path of oxygen is used for other places where oxygen is needed through the second pipeline, which can further make full use of the oxygen generated by the nitrogen generator, which is beneficial to saving energy consumption.

[0011] Optionally, the nitrogen inlet includes a first nitrogen inlet and a second nitrogen inlet, the first nitrogen inlet is arranged at the top of the regeneration tower, the second nitrogen outlet is arranged at the bottom of the regeneration tower, and the regeneration rich gas outlet is arranged in the middle of the regeneration tower. By arranging a nitrogen inlet at the top and bottom of the regeneration tower respectively, the pressure of the preheating section and the cooling section of the regeneration tower is relatively large relative to the pressure of the heating section, so that the regeneration rich gas generated in the heating section can be quickly discharged from the regeneration tower through the nitrogen outlet in the middle, which is conducive to improving the decomposition efficiency of the adsorbent saturated with adsorption in the regeneration tower.

[0012] Optionally, the oxygen supply pipe is arranged horizontally. When installing the oxygen supply pipe, a through hole can be opened on the furnace wall of the furnace body, and then the inlet end of the oxygen supply pipe is extended into the furnace of the boiler, and the oxygen supply pipe is connected to the furnace body by a flange or welding, so that the oxygen supply pipe is easy to install.

[0013] Optionally, the outlet end of the oxygen supply pipe is arranged adjacent to the edge of the furnace. The low-temperature adsorption regeneration system capable of deep peak regulation of the embodiment of the present invention can prevent the outlet end of the oxygen supply pipe from extending too deep into the furnace and interfering with the normal combustion of the burner by arranging the outlet end of the oxygen supply pipe at the edge of the furnace, which is beneficial to improving the combustion stability of the burner; at the same time, it can also prevent the oxygen supply pipe from extending too far into the furnace, reduce the contact area between the oxygen supply pipe and the combustion flame in the furnace, thereby reducing the heating temperature of the oxygen supply pipe, which is further beneficial to improving the service life of the oxygen supply pipe.

[0014] Optionally, there are multiple oxygen supply pipes, which are spaced apart on the furnace body. Due to the different positions of entering the furnace, the oxygen entering the furnace can have a larger diffusion area, and can fully contact with the coal powder to further improve the combustion effect.

[0015] Optionally, the plurality of oxygen supply pipes are divided into a plurality of groups, and the plurality of groups of oxygen supply pipes are spaced apart along the height direction of the furnace body, and each group of oxygen supply pipes are spaced apart along the circumference of the furnace body, which is beneficial to improving the uniformity of distribution of the oxygen passing through the furnace, and further beneficial to improving the combustion-supporting effect.

[0016] Optionally, the boiler has a plurality of primary air ducts, which are spaced apart in the height direction of the furnace body, and at least part of the primary air ducts form the oxygen delivery pipe. It is not necessary to separately set an oxygen delivery pipe on the furnace body for oxygen delivery, so that the low-temperature adsorption regeneration system capable of deep peak regulation of the embodiment of the present invention has a simple structure and is easy to manufacture.

[0017] Optionally, the boiler has a plurality of secondary air ducts, which are arranged at intervals in the height direction of the furnace body, and at least part of the outlet ends of the secondary air ducts extend into the furnace, and the secondary air ducts form the oxygen supply pipe. It is not necessary to separately arrange an oxygen supply pipe on the furnace body for oxygen delivery, so that the low-temperature adsorption regeneration system capable of deep peak regulation of the embodiment of the present invention has a simple structure and is easy to manufacture.

[0018] Optionally, the low-temperature adsorption regeneration system capable of deep peak regulation of the embodiment of the present invention further comprises a spray cooling tower, the spray cooling tower having a smoke inlet for supplying flue gas into the spray cooling tower and a smoke outlet for discharging the cooled flue gas, the smoke inlet being connected to the flue, the smoke outlet being connected to the flue gas inlet of the adsorption tower, and the spray cooling tower being used to cool the flue gas into low-temperature flue gas below zero and then supply it to the adsorption tower. When the temperature of the flue gas is low, the adsorption efficiency of the adsorbent can be greatly improved, thereby facilitating the improvement of the flue gas treatment efficiency of the low-temperature adsorption regeneration system capable of deep peak regulation of the embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a low-temperature adsorption regeneration system capable of deep peak regulation according to an embodiment of the present invention.

[0020] Figure 2 It is a schematic structural diagram of a boiler of a low-temperature adsorption regeneration system capable of deep peak regulation according to an embodiment of the present invention.

[0021] Figure 3 It is a cross-sectional view of a boiler of a low-temperature adsorption regeneration system capable of deep peak regulation according to an embodiment of the present invention.

[0022] Figure 4 It is a schematic diagram of the installation of the primary air duct and the secondary air duct of the low-temperature adsorption regeneration system capable of deep peak regulation according to an embodiment of the present invention.

[0023] Figure 5 It is a cross-sectional view of a boiler of a low-temperature adsorption regeneration system capable of deep peak regulation according to an embodiment of the present invention.

[0024] Figure 6 Schematic diagram of the structure of the adsorbent according to the embodiment of the present invention.

[0025] Reference numerals:

[0026] Low temperature adsorption regeneration system 100 capable of deep peak regulation;

[0027] Boiler 1; furnace body 101; furnace 1011; flue 102;

[0028] Oxygen supply tube 2;

[0029] Adsorption tower 3; flue gas inlet 301; clean flue gas outlet 302;

[0030] Regeneration tower 4; regeneration rich gas outlet 401; first nitrogen inlet 402; second nitrogen inlet 403;

[0031] Nitrogen generator 5; nitrogen outlet 501; oxygen outlet 502;

[0032] Main pipeline 6;

[0033] First pipeline 7;

[0034] The second pipeline 8;

[0035] A first control valve 9;

[0036] Primary air duct 10;

[0037] Secondary air duct 11;

[0038] Spray cooling tower 12; smoke inlet 1201; smoke outlet 1202;

[0039] 13. Breathable outer shell. DETAILED DESCRIPTION

[0040] The 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.

[0041] It should be noted that during use, the boiler 1 will perform deep peak regulation according to the power consumption of the power grid. Specifically, deep peak regulation can be understood as: when the power consumption of the power grid is high, the boiler 1 needs to operate at 100% rated load to meet the high power consumption demand; when the power consumption of the power grid is low, the boiler 1 needs to operate at 60%, 40% or 30% rated load to adapt to the low power consumption demand of the power grid. In other words, the deep peak regulation of the boiler 1 is the ability to adjust between peak power consumption and trough power consumption. However, when the boiler 1 is operating at a low load, due to the poor stable combustion ability of the coal powder, the boiler 1 is prone to flameout at a low load operation state.

[0042] like Figures 1 to 5 As shown, the low-temperature adsorption regeneration system 100 capable of deep peak regulation according to an embodiment of the present invention includes a boiler 1, an oxygen supply pipe 2, an adsorption tower 3, a regeneration tower 4 and a nitrogen generator 5.

[0043] The boiler 1 includes a furnace body 101 and a flue 102 . The furnace body 101 has a furnace 1011 . The flue 102 is connected to the furnace 1011 . An oxygen supply pipe 2 is arranged on the furnace body 101 and the outlet end of the oxygen supply pipe 2 extends into the furnace 1011 for supplying oxygen into the furnace 1011 .

[0044] The adsorption tower 3 has a flue gas inlet 301 and a clean flue gas outlet 302. The flue gas inlet 301 is connected to the flue 102. The adsorption tower 3 contains an adsorbent for adsorbing and purifying low-temperature flue gas below zero degrees into low-temperature clean flue gas. The regeneration tower 4 is used to regenerate and analyze the adsorbent that is saturated with adsorption in the adsorption tower 3.

[0045] The regeneration tower 4 has a regeneration rich gas outlet 401 for discharging the regeneration rich gas and a nitrogen inlet for introducing nitrogen. The nitrogen generator 5 has a nitrogen outlet 501 and an oxygen outlet 502, the nitrogen outlet 501 is connected to the nitrogen inlet of the regeneration tower 4, and the oxygen outlet 502 is connected to the inlet of the oxygen supply pipe 2.

[0046] In the low-temperature adsorption regeneration system 100 capable of deep peak regulation of the embodiment of the present invention, the nitrogen produced by the nitrogen generator 5 is discharged through the nitrogen outlet 501, and the nitrogen discharged from the nitrogen outlet 501 enters the regeneration tower 4 through the nitrogen inlet on the regeneration tower 4 to act as a protective gas to prevent the regeneration rich gas after analysis from being oxidized and corroded by the oxygen in the air. The oxygen produced by the nitrogen generator 5 is discharged through the oxygen outlet 502, and the high-concentration oxygen discharged from the oxygen outlet 502 enters the boiler 1 through the oxygen supply pipe 2 on the boiler 1 to support combustion.

[0047] When the boiler 1 is operated at 100% rated load, the oxygen introduced into the boiler 1 can be used for the full combustion of the pulverized coal, which can not only improve the combustion efficiency of the pulverized coal, but also realize the recycling of the high-concentration oxygen tail gas generated by the nitrogen generator 5, and is also conducive to saving energy. When the boiler 1 is operated at a low load, the high-concentration oxygen introduced into the boiler 1 through the oxygen supply pipe 2 plays a role in supporting the combustion of the pulverized coal, avoiding the flameout of the boiler 1 due to the poor stable combustion ability of the pulverized coal under low load conditions, so that the boiler 1 can be operated at 40% or even 30% rated load, thereby giving the boiler 1 a larger adjustment space on the valley peak and a stronger deep peak regulation capability.

[0048] Therefore, the low-temperature adsorption regeneration system 100 capable of deep peak regulation according to the embodiment of the present invention has a strong deep peak regulation capability.

[0049] In some embodiments, the low-temperature adsorption regeneration system 100 capable of deep peak regulation of the embodiment of the present invention comprises a main pipeline 6, a first branch pipeline 7, a second branch pipeline 8, and a first control valve 9. The inlet of the main pipeline 6 is connected to the oxygen outlet 502, the inlet of the first branch pipeline 7 and the inlet of the second branch pipeline 8 are both connected to the outlet of the main pipeline 6, the outlet of the first branch pipeline 7 is connected to the inlet of the oxygen supply pipe 2, and the first control valve 9 is provided on the first branch pipeline 7 to control the oxygen flow rate entering the oxygen supply pipe 2.

[0050] like Figure 1As shown, the high-concentration oxygen discharged from the oxygen outlet 502 of the nitrogen generator 5 is divided into two paths, one of which is passed through the first branch pipe 7 to the boiler 1 for combustion support, and the flow rate and pressure of the oxygen entering the boiler 1 are adjusted by adjusting the opening of the first control valve 9, so that the flow rate and pressure of the oxygen entering the boiler 1 are adapted according to the operating state of the boiler 1, ensuring that the boiler 1 can operate normally, which is conducive to improving the operating reliability of the boiler 1. The other oxygen is used for other places where oxygen is needed through the second branch pipe 8, which can further make full use of the oxygen generated by the nitrogen generator 5, which is conducive to saving energy consumption.

[0051] In some embodiments, the nitrogen inlet includes a first nitrogen inlet 402 and a second nitrogen inlet 403 , the first nitrogen inlet 402 is disposed at the top of the regeneration tower 4 , the second nitrogen outlet 501 is disposed at the bottom of the regeneration tower 4 , and the regeneration rich gas outlet 401 is disposed in the middle of the regeneration tower 4 .

[0052] It should be noted that if Figure 1 As shown, the regeneration tower 4 includes a preheating section, a heating section and a cooling section in order from top to bottom. The adsorbent saturated with adsorption will be preheated in the preheating section and then flow into the heating section for heating, so that the adsorbent is decomposed in the heating section, and the regenerated rich gas regenerated by decomposition will be discharged through the rich gas of the regeneration tower 4. The decomposed adsorbent will be discharged from the regeneration tower 4 after cooling in the cooling section and enter the adsorption tower 3 to adsorb flue gas. By arranging a nitrogen inlet at the top and bottom of the regeneration tower 4, the pressure of the preheating section and the cooling section of the regeneration tower 4 is relatively large relative to the pressure of the heating section, so that the regenerated rich gas generated in the heating section can be quickly discharged from the regeneration tower 4 through the nitrogen outlet 501 in the middle, which is conducive to improving the decomposition efficiency of the adsorbent saturated with adsorption in the regeneration tower 4.

[0053] In some embodiments, the oxygen supply tube 2 is arranged horizontally.

[0054] For example, Figure 2 and Figure 3 As shown, when installing the oxygen supply pipe 2, a through hole can be first opened on the furnace wall of the furnace body 101, and then the inlet end of the oxygen supply pipe 2 is extended into the furnace 1011 of the boiler 1, and the oxygen supply pipe 2 is connected to the furnace body 101 by a flange or welding, so that the oxygen supply pipe 2 is easy to install.

[0055] In some embodiments, the outlet end of the oxygen supply pipe 2 is disposed adjacent to the edge of the furnace 1011 .

[0056] For example, Figure 3As shown, the low-temperature adsorption regeneration system 100 capable of deep peak regulation of the embodiment of the present invention can prevent the outlet end of the oxygen supply pipe 2 from extending too deeply into the furnace 1011 and interfering with the normal combustion of the burner, which is beneficial to improving the combustion stability of the burner; at the same time, it can also prevent the oxygen supply pipe 2 from extending too far into the furnace 1011, reducing the contact area between the oxygen supply pipe 2 and the combustion flame in the furnace 1011, thereby reducing the heating temperature of the oxygen supply pipe 2, which is further beneficial to improving the service life of the oxygen supply pipe 2.

[0057] In some embodiments, there are multiple oxygen supply pipes 2 , and the multiple oxygen supply pipes 2 are arranged on the furnace body 101 at intervals.

[0058] For example, Figure 2 and Figure 3 As shown, the low-temperature adsorption regeneration system 100 capable of deep peak regulation of the embodiment of the present invention arranges a plurality of oxygen supply pipes 2 at intervals on the furnace body 101, and oxygen can enter different positions in the furnace 1011 through the plurality of oxygen supply pipes 2. Due to the different positions of entering the furnace 1011, the oxygen entering the furnace 1011 can have a larger diffusion area, and can fully contact with the coal powder for combustion, which is beneficial to further improve the combustion effect.

[0059] In some embodiments, the plurality of oxygen supply pipes 2 are divided into a plurality of groups, the plurality of groups of oxygen supply pipes 2 are arranged at intervals along the height direction of the furnace body 101 , and each group of oxygen supply pipes 2 are arranged at intervals along the circumference of the furnace body 101 .

[0060] For example, Figure 2 and Figure 3 As shown, the multiple oxygen supply pipes 2 are divided into two groups, and the two groups of oxygen supply pipes 2 are arranged at intervals in the height direction of the furnace body 101. Each group of oxygen supply pipes 2 includes eight oxygen supply pipes 2, and the eight oxygen supply pipes 2 are evenly spaced along the circumference of the furnace body 101. Two oxygen supply pipes 2 are arranged on each furnace wall of the furnace body 101. The nitrogen oxide recycling system of the embodiment of the present invention is beneficial to improving the uniformity of the distribution of the oxygen passing through the furnace 1011 by dividing the multiple oxygen supply pipes 2 into multiple groups, and the multiple groups of oxygen supply pipes 2 are spaced along the height direction of the furnace body 101, and each group of oxygen supply pipes 2 is spaced along the circumference of the furnace body 101, which is beneficial to improving the combustion-supporting effect.

[0061] In some embodiments, the boiler 1 has a plurality of primary air ducts 10 , which are spaced apart in the height direction of the furnace body 101 , and at least some of the primary air ducts 10 form oxygen supply pipes 2 .

[0062] At least part of the primary air ducts 10 form the oxygen supply pipe 2 , which can be understood as oxygen can enter the furnace 101 through a part of the primary air ducts 10 , or oxygen can enter the furnace 10 through each primary air duct 10 .

[0063] For example, Figure 4 and Figure 5 As shown, oxygen enters the furnace 1011 through a portion of the primary air duct 10. The low-temperature adsorption regeneration system 100 capable of deep peak regulation according to the embodiment of the present invention forms an oxygen delivery pipe 2 from at least a portion of the primary air duct 10, so that it is not necessary to separately set an oxygen delivery pipe 2 on the furnace body 101 for oxygen delivery, so that the low-temperature adsorption regeneration system 100 capable of deep peak regulation according to the embodiment of the present invention has a simple structure and is easy to manufacture.

[0064] In some embodiments, the boiler 1 includes a plurality of secondary air ducts 11 , which are arranged at intervals in the height direction of the furnace body 101 , and at least some of the secondary air ducts 11 form the oxygen supply pipes 2 .

[0065] At least part of the secondary air ducts 11 form the oxygen supply pipe 2 . It can be understood that oxygen can enter the furnace 101 through a part of the secondary air ducts 11 , or oxygen can enter the furnace 10 through each secondary air duct 11 .

[0066] For example, Figure 4 and Figure 5 As shown, oxygen enters the furnace 1011 through a portion of the secondary air duct 11. The low-temperature adsorption regeneration system 100 capable of deep peak regulation according to the embodiment of the present invention forms the oxygen delivery pipe 2 with at least a portion of the secondary air duct 11, so that it is not necessary to separately set the oxygen delivery pipe 2 on the furnace body 101 for oxygen delivery, so that the low-temperature adsorption regeneration system 100 capable of deep peak regulation according to the embodiment of the present invention has a simple structure and is easy to manufacture.

[0067] In some embodiments, the low-temperature adsorption regeneration system 100 capable of deep peak regulation of an embodiment of the present invention also includes a spray cooling tower 12, which has a smoke inlet 1201 for supplying flue gas into the spray cooling tower 12 and a smoke outlet 1202 for discharging the cooled flue gas, the smoke inlet 1201 is connected to the flue 102, and the smoke outlet 1202 is connected to the flue gas inlet 301 of the adsorption tower 3, and the spray cooling tower 12 is used to cool the flue gas into low-temperature flue gas below zero degrees and then supply it to the adsorption tower 3.

[0068] For example, Figure 1 As shown, the flue gas discharged from the flue 102 enters the spray cooling tower 12 through the smoke inlet 1201, is spray-cooled in the spray cooling tower 12, and then discharged through the smoke outlet 1202, so that the temperature of the high-temperature flue gas is reduced to below zero degrees before entering the adsorption tower 3. It can be understood that when the temperature of the flue gas is low, the adsorption efficiency of the adsorbent can be greatly improved, which is conducive to improving the flue gas treatment efficiency of the low-temperature adsorption regeneration system 100 capable of deep peak regulation according to the embodiment of the present invention.

[0069] In an embodiment of the present invention, low-temperature flue gas is flue gas below room temperature, so that the adsorbent performs low-temperature adsorption on the flue gas, improves the adsorption effect, and can achieve near-zero emissions. Preferably, the temperature of the low-temperature flue gas is below zero, for example, -80°C to -5°C. More preferably, the temperature of the low-temperature flue gas is -20°C to -10°C. The inventors have found through research that the lower the flue gas temperature, the more beneficial it is for adsorption purification. However, if the flue gas temperature is too low, the equipment structure for cooling the flue gas will be complex and the energy consumption will increase. For example, the cooling equipment, the adsorption tower, and the pipeline have high requirements for sealing, which will increase the cost. In addition, too low temperature conditions will easily cause condensation water to appear in the adsorption chamber, causing the adsorbent to stick and clog, affecting the adsorption. Therefore, it is beneficial to cool the flue gas temperature to -20°C to -10°C.

[0070] In an embodiment of the present invention, the adsorbent may be a granular or powdered adsorbent, or an adsorbent body made of powdered or granular adsorbent, such as a sphere or cylinder formed by a powdered or granular adsorbent through a binder. Of course, a protective shell may be further formed on the outside of the adsorbent body, such as a breathable film covering the outside of the adsorbent body, to improve the strength of the adsorbent body.

[0071] like Figure 2 As shown, the adsorbent can be filled in the air-permeable shell 13 to form an adsorption unit, wherein the air-permeable shell 13 has air holes, and the smoke can enter the air-permeable shell 13 through the air holes. The smoke can pass through the gaps between adjacent adsorbents and / or the holes of the adsorbents themselves, thereby reducing direct collisions, friction and wear between adsorbents, and the generation of dust. The air-permeable shell 13 can be in the shape of a rotating body such as a sphere or a cylinder, wherein the diameter of the air-permeable shell 13 is 10mm-100mm, and the diameter of the adsorbent is 1mm-10mm.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A low-temperature adsorption regeneration system capable of deep peak regulation, characterized in that: include: A boiler, the boiler comprising a furnace body and a flue, the furnace body having a furnace, the flue being in communication with the furnace; An oxygen supply pipe, the oxygen supply pipe is arranged on the furnace body and the outlet end of the oxygen supply pipe extends into the furnace, and is used to supply oxygen into the furnace; An adsorption tower, wherein the adsorption tower has a flue gas inlet and a clean flue gas outlet, the flue gas inlet is connected to the flue, and the adsorption tower has an adsorbent for adsorbing and purifying low-temperature flue gas below zero degrees into low-temperature clean flue gas; A regeneration tower, the regeneration tower is used to regenerate and analyze the adsorbent that is saturated with adsorption in the adsorption tower, the regeneration tower has a regeneration rich gas outlet for discharging regeneration rich gas and a nitrogen inlet for introducing nitrogen; and A nitrogen generator, wherein the nitrogen generator has a nitrogen outlet and an oxygen outlet, wherein the nitrogen outlet is communicated with the nitrogen inlet of the regeneration tower, and the oxygen outlet is communicated with the inlet end of the oxygen supply pipe.

2. The low-temperature adsorption regeneration system capable of deep peak regulation according to claim 1, characterized in that: include: a main pipeline, the inlet of which is in communication with the oxygen outlet of the nitrogen generator; a first branch pipeline and a second branch pipeline, wherein the inlet of the first branch pipeline and the inlet of the second branch pipeline are both connected to the outlet of the main pipeline, and the outlet of the first branch pipeline is connected to the inlet of the oxygen supply pipe; and The first control valve is arranged on the first branch pipeline and is used to control the flow rate of oxygen entering the oxygen supply pipe.

3. The low-temperature adsorption regeneration system capable of deep peak regulation according to claim 1, characterized in that: The nitrogen inlet includes a first nitrogen inlet and a second nitrogen inlet, the first nitrogen inlet is arranged at the top of the regeneration tower, the second nitrogen outlet is arranged at the bottom of the regeneration tower, and the regeneration rich gas outlet is arranged in the middle of the regeneration tower.

4. The low-temperature adsorption regeneration system capable of deep peak regulation according to claim 1, characterized in that: The oxygen delivery pipe is arranged horizontally.

5. The low-temperature adsorption regeneration system capable of deep peak regulation according to claim 4, characterized in that: The outlet end of the oxygen supply pipe is arranged adjacent to the edge of the furnace.

6. The low-temperature adsorption regeneration system capable of deep peak regulation according to claim 5 is characterized in that There are multiple oxygen supply pipes, and the multiple oxygen supply pipes are arranged on the furnace body at intervals.

7. The low-temperature adsorption regeneration system capable of deep peak regulation according to claim 6, characterized in that: The plurality of oxygen supply pipes are divided into a plurality of groups, and the plurality of groups of oxygen supply pipes are arranged at intervals along the height direction of the furnace body, and each group of oxygen supply pipes is arranged at intervals along the circumference direction of the furnace body.

8. The low-temperature adsorption regeneration system capable of deep peak regulation according to claim 1, characterized in that: The boiler is provided with a plurality of primary air ducts, which are arranged at intervals in the height direction of the furnace body, and at least a portion of the primary air ducts form the oxygen supply pipe.

9. The low-temperature adsorption regeneration system capable of deep peak regulation according to claim 1, characterized in that: The boiler is provided with a plurality of secondary air ducts, which are arranged at intervals in the height direction of the furnace body, and outlet ends of at least some of the secondary air ducts extend into the furnace, and the secondary air ducts form the oxygen supply pipes.

10. The low-temperature adsorption regeneration system capable of deep peak regulation according to claim 1, characterized in that: It also includes a spray cooling tower, which has a smoke inlet for supplying smoke into the spray cooling tower and a smoke outlet for discharging the cooled smoke, the smoke inlet is connected to the flue, and the smoke outlet is connected to the smoke inlet of the adsorption tower. The spray cooling tower is used to cool the smoke into low-temperature smoke below zero degrees and then supply it to the adsorption tower.

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