Biomass feeding system based on mercury oxidizing atmosphere optimization and control method

Abstract

The invention provides a biomass feeding system and control method based on mercury oxidizing atmosphere optimization, and the control method comprises the following steps: obtaining a first mercury concentration at an inlet of an SCR reactor, and obtaining a second mercury concentration at an outlet of the SCR reactor; calculating the demercuration efficiency of the SCR reactor according to the first mercury concentration and the second mercury concentration; acquiring the concentration of HCl in the hearth in real time; according to the HCl concentration in a hearth, the HCl concentration required by a demercuration reaction in an SCR reactor, the designed blending combustion amount M design of the hearth, the biomass feeding amount M critical 1 of which the high-temperature zone reaches the HCl critical point of high-temperature corrosion of the hearth and the biomass feeding amount M critical 2 of which the dioxin concentration reaches the critical point in a low-temperature zone; and the feeding amount of the biomass from the high-temperature area and the feeding amount of the biomass from the low-temperature area are determined. The method has the technical effects that the dynamic adjustment of the biomass blending combustion total amount can be realized, the biomass can be reasonably absorbed, the safety is high, and the method is more environment-friendly.

Description

Technical Field

[0001] The invention belongs to the technical field of mercury treatment in coal-fired flue gas, and in particular relates to a biomass feeding system and a control method based on mercury oxidation atmosphere optimization. Background Art

[0002] Mercury exists in three forms in coal-fired flue gas: elemental mercury Hg 0 , Oxidized mercury Hg 2+ and particulate mercury Hg p , where Hg 0 Insoluble in water, highly volatile, difficult to capture and remove, but can be partially oxidized to Hg in the SCR reactor 2+ , oxidized mercury H g2+ Easily absorbed by the desulfurization system slurry, particulate mercury Hg p Most of it is captured in the fly ash when passing through the dust collector. Therefore, elemental mercury Hg is removed as much as possible. 0 The final mercury emission concentration can be effectively reduced, that is, the elemental mercury Hg 0 Converted to oxidized mercury Hg 2+ and removed by subsequent desulfurization equipment.

[0003] Under the condition that the mercury oxidation performance of the catalyst itself is constant, as the concentration of HCl / HBr in the flue gas increases, the oxidation efficiency of the catalyst for elemental mercury increases rapidly. Therefore, by increasing the concentration of halogen elements in the SCR reactor, the Hg 0 Converted to Hg 2+ proportion.

[0004] Biomass usually includes garbage, sludge, and agricultural and forestry waste, all of which contain a certain amount of chlorine. Therefore, the chlorine in biomass can promote the oxidation of mercury, but there are some problems. Usually, biomass enters the furnace together with coal through the fuel inlet. Due to the high chlorine content, it is easy to burn in the high-temperature furnace and cause high-temperature corrosion of hydrogen chloride in the furnace. Some technologies also spray biomass from the low-temperature zone of the furnace. At this time, although the high-temperature corrosion caused by chlorine is avoided, due to the low temperature at this time, the chlorine in the biomass will burn at low temperature to form dioxins (dioxins can be completely decomposed above 900°C, the furnace temperature is generally 1300°C, and the low-temperature zone is usually 500-600°C). Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art and provide a new technical solution of a biomass feeding system and a control method based on mercury oxidation atmosphere optimization.

[0006] According to a first aspect of the present invention, a control method for a biomass feeding system based on mercury oxidation atmosphere optimization is provided, comprising the following steps:

[0007] Acquire a first mercury concentration at an inlet of the SCR reactor, and acquire a second mercury concentration at an outlet of the SCR reactor;

[0008] calculating a mercury removal efficiency of the SCR reactor according to the first mercury concentration and the second mercury concentration, and calculating a concentration of HCl required for a mercury removal reaction in the SCR reactor according to the mercury removal efficiency of the SCR reactor;

[0009] Obtain the HCl concentration in the furnace in real time;

[0010] According to the HCl concentration in the furnace, the HCl concentration required for the mercury removal reaction in the SCR reactor, and the designed mixing amount M in the furnace, 设计 , the biomass feed amount M in the high temperature zone that reaches the critical point of HCl for high temperature corrosion in the furnace 临界1 and the biomass feed amount M at which the dioxin concentration in the low temperature zone reaches the critical point 临界2 , determine the feed rate of biomass from the high temperature zone and the feed rate of biomass from the low temperature zone.

[0011] Optionally, according to the HCl concentration in the furnace, the HCl concentration required for the mercury removal reaction in the SCR reactor, and the designed blending amount M of the furnace, 设计 , the biomass feed amount M in the high temperature zone that reaches the critical point of HCl for high temperature corrosion in the furnace 临界1 and the biomass feed amount M at which the dioxin concentration in the low temperature zone reaches the critical point 临界2 , determine the feed rate of biomass from the high temperature zone and the feed rate of biomass from the low temperature zone, including:

[0012] The biomass entering the furnace from the high temperature zone participates in the combustion. When the HCl concentration in the furnace is the same as the HCl concentration required for the mercury removal reaction in the SCR reactor, the actual feed amount of biomass from the high temperature zone is obtained as M1;

[0013] Get the designed blending amount M of the furnace 设计 , according to M1, M 设计 、M 临界1 Determine the feed amount of biomass from the high temperature zone and the feed amount of biomass from the low temperature zone;

[0014] Among them, when M1>M 设计 When the biomass is fed from the high temperature zone, the feed rate is M 设计 ;

[0015] When M1<M 设计 When M1<M 设计 <M 临界1 When the biomass is fed from the high temperature zone, the feed rate is M 设计 ;

[0016] When M1<M设计 When M1<M 临界1 <M 设计 When the biomass is fed from the high temperature zone, the feed rate is M 临界1 At the same time, the biomass entering the furnace from the low temperature zone participates in the combustion, and the feed rate of biomass from the low temperature zone is M 临界2 .

[0017] Optionally, the temperature of the low temperature zone is 500°C to 600°C.

[0018] Optionally, the ignition temperature of the biomass is 300°C.

[0019] Optionally, a dioxin detection device is provided at the outlet of the furnace to detect the concentration of dioxins.

[0020] Optionally, an HCl detection device is provided on the inner wall surface of the furnace for real-time detection of HCl concentration in the furnace.

[0021] Optionally, the first mercury real-time monitoring instrument is installed at the inlet of the SCR reactor to obtain a first mercury concentration at the inlet of the SCR reactor;

[0022] The second mercury real-time monitoring instrument is installed at the outlet of the SCR reactor to obtain a second mercury concentration at the outlet of the SCR reactor.

[0023] According to a second aspect of the present invention, there is provided a biomass feeding system based on mercury oxidation atmosphere optimization, comprising:

[0024] An acquisition unit, the acquisition unit is used to acquire a first mercury concentration at an inlet of the SCR reactor and acquire a second mercury concentration at an outlet of the SCR reactor;

[0025] a calculation unit, the calculation unit being used to calculate a mercury removal efficiency of the SCR reactor according to the first mercury concentration and the second mercury concentration, and to calculate a concentration of HCl required for a mercury removal reaction in the SCR reactor according to the mercury removal efficiency of the SCR reactor;

[0026] A measuring unit, the measuring unit is used to obtain the HCl concentration in the furnace in real time;

[0027] The control unit is based on the HCl concentration in the furnace, the HCl concentration required for the mercury removal reaction in the SCR reactor, and the designed blending amount M in the furnace. 设计 , the biomass feed amount M in the high temperature zone that reaches the critical point of HCl for high temperature corrosion in the furnace 临界1 and the biomass feed amount M at which the dioxin concentration in the low temperature zone reaches the critical point 临界2 , determine the feed rate of biomass from the high temperature zone and the feed rate of biomass from the low temperature zone.

[0028] Optionally, the acquisition unit includes a first mercury real-time monitoring instrument and a second mercury real-time monitoring instrument;

[0029] The first mercury real-time monitoring instrument is used to obtain a first mercury concentration at the inlet of the SCR reactor;

[0030] The second mercury real-time monitoring instrument is used to obtain a second mercury concentration at the outlet of the SCR reactor.

[0031] Optionally, the measuring unit is a HCl detection device.

[0032] A technical effect of the present invention is:

[0033] In the embodiment of the present application, the control method of the biomass feeding system based on mercury oxidation atmosphere optimization can be based on the HCl concentration in the furnace, the HCl concentration required for the mercury removal reaction in the SCR reactor, the designed blending amount M of the furnace, 设计 , the biomass feed amount M in the high temperature zone that reaches the critical point of HCl for high temperature corrosion in the furnace 临界1 and the biomass feed amount M at which the dioxin concentration in the low temperature zone reaches the critical point 临界2 , determine the feed amount of biomass from the high temperature zone and the feed amount of biomass from the low temperature zone, so as to reasonably allocate the incineration amount of biomass in the high temperature zone and the low temperature zone.

[0034] In addition, the control method of the biomass feeding system based on mercury oxidation atmosphere optimization of the present application is reasonably designed. On the one hand, the incineration of biomass will produce a certain amount of hydrogen chloride to ensure the oxidation of mercury, and at the same time will not produce a large amount of hydrogen chloride to cause high-temperature corrosion. On the other hand, the biomass will not produce excessive dioxins to cause unqualified emissions, and it realizes the dynamic adjustment of the total amount of biomass co-combustion and the reasonable consumption of biomass. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic flow chart of a control method of a biomass feeding system based on mercury oxidation atmosphere optimization according to another embodiment of the present invention. DETAILED DESCRIPTION

[0036] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0037] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0038] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0039] In the description of the present application, it should 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 a limitation on the present application.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] According to a first aspect of the present invention, see Figure 1 , provides a control method for a biomass feeding system based on mercury oxidation atmosphere optimization, comprising the following steps:

[0042] Step S1, obtaining a first mercury concentration at the inlet of the SCR reactor, and obtaining a second mercury concentration at the outlet of the SCR reactor; wherein the first mercury concentration and the second mercury concentration both refer to elemental mercury Hg 0 , Oxidized mercury Hg 2+ and particulate mercury Hgp total concentration.

[0043] Step S2, calculating the mercury removal efficiency of the SCR reactor according to the first mercury concentration and the second mercury concentration, and calculating the concentration of HCl required for the mercury removal reaction in the SCR reactor according to the mercury removal efficiency of the SCR reactor;

[0044] Step S3, obtaining the HCl concentration in the furnace in real time;

[0045] Step S4, according to the HCl concentration in the furnace, the HCl concentration required for the mercury removal reaction in the SCR reactor, and the designed mixing amount M of the furnace, 设计 , the biomass feed amount M in the high temperature zone that reaches the critical point of HCl for high temperature corrosion in the furnace 临界1 and the biomass feed amount M at which the dioxin concentration in the low temperature zone reaches the critical point 临界2 , determine the feed rate of biomass from the high temperature zone and the feed rate of biomass from the low temperature zone.

[0046] In the embodiment of the present application, the control method of the biomass feeding system based on mercury oxidation atmosphere optimization can be based on the HCl concentration in the furnace, the HCl concentration required for the mercury removal reaction in the SCR reactor, the designed blending amount M of the furnace, 设计 , the biomass feed amount M in the high temperature zone that reaches the critical point of HCl for high temperature corrosion in the furnace 临界1 and the biomass feed amount M at which the dioxin concentration in the low temperature zone reaches the critical point 临界2 , determine the feed amount of biomass from the high temperature zone and the feed amount of biomass from the low temperature zone, so as to reasonably allocate the incineration amount of biomass in the high temperature zone and the low temperature zone.

[0047] In addition, the control method of the biomass feeding system based on mercury oxidation atmosphere optimization of the present application is reasonably designed. On the one hand, the incineration of biomass will produce a certain amount of hydrogen chloride to ensure the oxidation of mercury, and at the same time will not produce a large amount of hydrogen chloride to cause high-temperature corrosion. On the other hand, the biomass will not produce excessive dioxins to cause unqualified emissions, and it realizes the dynamic adjustment of the total amount of biomass co-combustion and the reasonable consumption of biomass.

[0048] It should be noted that the HCl concentration c in the furnace area is first obtained by experimental testing. HCl，炉 , HCl concentration in the SCR area c HCl，SCR Mercury concentration before and after SCR The relationship between HCl，炉 The higher the c HCl，SCR The higher the concentration of HCl in the reactor, the higher the mercury oxidation efficiency, which is basically a linear relationship:

[0049] c HCl，炉 =α×c HCl，SCR

[0050]

[0051] In the above formula:

[0052] c HCl，炉 ——HCl concentration in the furnace area, in ppm;

[0053] α, β——dimensionless coefficients;

[0054] c HCl，SCR ——HCl concentration in the SCR area, in ppm;

[0055] ——Total mercury concentration, in μg / m 3 ;

[0056] ——Elemental mercury concentration, in μg / m 3 ;

[0057] ——Concentration of oxidized mercury, in μg / m 3 ;

[0058] ——Concentration of particulate mercury, in μg / m 3 .

[0059] ——Concentration of oxidized mercury at the SCR outlet, in μg / m 3 ;

[0060] ——Total mercury concentration at SCR outlet, in μg / m 3 ;

[0061] ——Concentration of elemental mercury at the SCR outlet, in μg / m 3 ;

[0062] ——Concentration of particulate mercury at the SCR outlet, in μg / m 3 ;

[0063] η——mercury oxidation efficiency, %.

[0064] Through the above analysis, the mercury oxidation efficiency is mainly positively correlated with the HCl concentration in the SCR reactor. In order to achieve a mercury concentration that meets the emission standards, it is necessary to control the HCl concentration in the flue gas to not be lower than a certain level.

[0065] Since the chlorine content in coal is relatively low and cannot meet the requirements for mercury oxidation efficiency, the present invention combines biomass as a supplement, and the chlorine content in biomass is relatively high.

[0066] Optionally, according to the HCl concentration in the furnace, the HCl concentration required for the mercury removal reaction in the SCR reactor, and the designed blending amount M of the furnace, 设计 , the biomass feed amount M in the high temperature zone that reaches the critical point of HCl for high temperature corrosion in the furnace 临界1 and the biomass feed amount M at which the dioxin concentration in the low temperature zone reaches the critical point 临界2 , determine the feed rate of biomass from the high temperature zone and the feed rate of biomass from the low temperature zone, including:

[0067] The biomass entering the furnace from the high temperature zone participates in the combustion. When the HCl concentration in the furnace is the same as the HCl concentration required for the mercury removal reaction in the SCR reactor, the actual feed amount of biomass from the high temperature zone is obtained as M1;

[0068] According to M1, M 设计 、M 临界1 Determine the feed amount of biomass from the high temperature zone and the feed amount of biomass from the low temperature zone;

[0069] Among them, when M1>M 设计 When the biomass is fed from the high temperature zone, the feed rate is M 设计 That is, M1>M 设计 This indicates that in order to obtain good mercury oxidation capacity, the amount of biomass blended has exceeded M 设计 Design, M. 设计 Generally, the amount of surrounding biomass resources, unit parameters, etc. should be considered. In order to ensure the safe operation of the unit, the actual feed amount should not exceed M 设计 Design, at this time, biomass according to M 设计 Enter from a high temperature area.

[0070] When M1<M 设计 When M1 is increased, M1 needs to be compared. 设计 With M 临界1 Size:

[0071] Specifically, when M1<M 设计 When M1<M 设计 <M 临界1 When the biomass is fed from the high temperature zone, the feed rate is M 设计 ; That is, M1<M 设计 <M 临界1 This indicates that M1 reaches M 设计 When M 临界1 , then all biomass can enter from the furnace, at this time the mercury oxidation efficiency is satisfied, and the furnace will not be corroded at high temperature. The biomass feed rate is calculated according to M 设计 Enter from a high temperature area.

[0072] More specifically, when M1<M 设计 When M1<M 临界1 <M 设计 When the biomass is fed from the high temperature zone, the feed rate is M 临界1 At the same time, the biomass entering the furnace from the low temperature zone participates in the combustion, and the feed rate of biomass from the low temperature zone is M 临界2 That is, M1<M 临界1 <M 设计 This indicates that if the amount of biomass continues to increase, M 设计 When the HCl concentration in the furnace increases too high, high-temperature corrosion will occur in the furnace area. The biomass feed rate is based on M 临界1 Enter from the high temperature zone. Obviously, the amount of biomass needs to continue to increase at this time, but it cannot be added from the high temperature zone, which will cause high temperature corrosion. Therefore, the present invention introduces a biomass feeding device at the tail flue of the furnace, and sprays the biomass from the tail flue. The amount of biomass is defined as M2. At this time, the flue gas temperature is about 500-600°C, and the ignition temperature of biomass is usually 300°C, so it can be incinerated here. At this time, due to the low temperature in the low temperature zone, dioxins will be produced. Therefore, the present invention adds a dioxin detection device at the total exhaust port of the chimney. When M2 continues to increase until the dioxin concentration in the low temperature zone reaches the critical point, the biomass feed amount M 临界2 After that, it indicates that M2 cannot continue to increase. Therefore, the biomass feed amount from the high temperature zone is M 临界1 , the feed amount from the low temperature zone is M 临界2 , which can ensure the efficiency of mercury oxidation, while absorbing biomass as much as possible and ensuring that dioxins do not exceed the standard.

[0073] Optionally, the temperature of the low temperature zone is 500° C. to 600° C. This can better ensure the combustion effect of biomass in the low temperature zone.

[0074] Optionally, the ignition temperature of the biomass is 300° C. This can further ensure the combustion effect of the biomass in the low temperature zone.

[0075] Optionally, a dioxin detection device is provided at the outlet of the furnace to detect the concentration of dioxins, which can effectively avoid dioxin exceeding the standard and has a better environmental protection effect.

[0076] Optionally, an HCl detection device is provided on the inner wall surface of the furnace to detect the HCl concentration in the furnace in real time, which can detect the HCl concentration in the furnace in real time and accurately with high accuracy.

[0077] Optionally, the first mercury real-time monitoring instrument is installed at the inlet of the SCR reactor to obtain a first mercury concentration at the inlet of the SCR reactor;

[0078] The second mercury real-time monitoring instrument is installed at the outlet of the SCR reactor to obtain a second mercury concentration at the outlet of the SCR reactor.

[0079] In the above embodiment, the first real-time mercury monitoring instrument can accurately obtain the first mercury concentration at the inlet of the SCR reactor; the second real-time mercury monitoring instrument can accurately obtain the second mercury concentration at the outlet of the SCR reactor.

[0080] According to a second aspect of the present invention, there is provided a biomass feeding system based on mercury oxidation atmosphere optimization, comprising:

[0081] An acquisition unit, the acquisition unit is used to acquire a first mercury concentration at an inlet of the SCR reactor and acquire a second mercury concentration at an outlet of the SCR reactor;

[0082] a calculation unit, the calculation unit being used to calculate a mercury removal efficiency of the SCR reactor according to the first mercury concentration and the second mercury concentration, and to calculate a concentration of HCl required for a mercury removal reaction in the SCR reactor according to the mercury removal efficiency of the SCR reactor;

[0083] A measuring unit, the measuring unit is used to obtain the HCl concentration in the furnace in real time;

[0084] The control unit is used to adjust the furnace temperature according to the concentration of HCl in the furnace, the concentration of HCl required for the mercury removal reaction in the SCR reactor, and the designed amount of blending M in the furnace. 设计 , the biomass feed amount M in the high temperature zone that reaches the critical point of HCl for high temperature corrosion in the furnace 临界1 and the biomass feed amount M at which the dioxin concentration in the low temperature zone reaches the critical point 临界2 , determine the feed rate of biomass from the high temperature zone and the feed rate of biomass from the low temperature zone.

[0085] In the above embodiment, the biomass feeding system based on mercury oxidation atmosphere optimization can be based on the HCl concentration in the furnace, the HCl concentration required for the mercury removal reaction in the SCR reactor, the designed blending amount M of the furnace, and the 设计 , the biomass feed amount M in the high temperature zone that reaches the critical point of HCl for high temperature corrosion in the furnace 临界1 and the biomass feed amount M at which the dioxin concentration in the low temperature zone reaches the critical point 临界2 , determine the feed amount of biomass from the high temperature zone and the feed amount of biomass from the low temperature zone, so as to reasonably allocate the incineration amount of biomass in the high temperature zone and the low temperature zone.

[0086] Optionally, the acquisition unit includes a first mercury real-time monitoring instrument and a second mercury real-time monitoring instrument;

[0087] The first mercury real-time monitoring instrument is used to obtain a first mercury concentration at the inlet of the SCR reactor;

[0088] The second mercury real-time monitoring instrument is used to obtain a second mercury concentration at the outlet of the SCR reactor.

[0089] In the above embodiment, the first real-time mercury monitoring instrument can obtain the first mercury concentration at the inlet of the SCR reactor in real time and accurately; the second real-time mercury monitoring instrument can obtain the second mercury concentration at the outlet of the SCR reactor in real time and accurately.

[0090] Optionally, the measuring unit is an HCl detection device. The HCl detection device can detect the HCl concentration in the furnace in real time and accurately with high accuracy.

[0091] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A control method for a biomass feeding system based on mercury oxidation atmosphere optimization, characterized in that: The steps include: Acquire a first mercury concentration at an inlet of the SCR reactor, and acquire a second mercury concentration at an outlet of the SCR reactor; calculating a mercury removal efficiency of the SCR reactor according to the first mercury concentration and the second mercury concentration, and calculating a concentration of HCl required for a mercury removal reaction in the SCR reactor according to the mercury removal efficiency of the SCR reactor; Obtain the HCl concentration in the furnace in real time; According to the HCl concentration in the furnace, the HCl concentration required for the mercury removal reaction in the SCR reactor, and the designed mixing amount M in the furnace, 设计 , the biomass feed amount M in the high temperature zone that reaches the critical point of HCl for high temperature corrosion in the furnace 临界1 and the biomass feed amount M at which the dioxin concentration in the low temperature zone reaches the critical point 临界2 , determine the feed rate of biomass from the high temperature zone and the feed rate of biomass from the low temperature zone.

2. The control method of the biomass feeding system based on mercury oxidation atmosphere optimization according to claim 1 is characterized in that: According to the HCl concentration in the furnace, the HCl concentration required for the mercury removal reaction in the SCR reactor, and the designed mixing amount M in the furnace, 设计 , the biomass feed amount M in the high temperature zone that reaches the critical point of HCl for high temperature corrosion in the furnace 临界1 and the biomass feed amount M at which the dioxin concentration in the low temperature zone reaches the critical point 临界2 , determine the feed rate of biomass from the high temperature zone and the feed rate of biomass from the low temperature zone, including: The biomass entering the furnace from the high temperature zone participates in the combustion. When the HCl concentration in the furnace is the same as the HCl concentration required for the mercury removal reaction in the SCR reactor, the actual feed amount of biomass from the high temperature zone is obtained as M1; Get the designed blending amount M of the furnace 设计 , according to M1, M 设计 、M 临界1 Determine the feed amount of biomass from the high temperature zone and the feed amount of biomass from the low temperature zone; Among them, when M1>M 设计 When the biomass is fed from the high temperature zone, the feed rate is M 设计 ; When M1<M 设计 When M1<M 设计 <M 临界1 When the biomass is fed from the high temperature zone, the feed rate is M 设计 ; When M1<M 设计 When M1<M 临界1 <M 设计 When the biomass is fed from the high temperature zone, the feed rate is M 临界1 At the same time, the biomass entering the furnace from the low temperature zone participates in the combustion, and the feed rate of biomass from the low temperature zone is M 临界2 .

3. The control method of the biomass feeding system based on mercury oxidation atmosphere optimization according to claim 2 is characterized in that: The temperature of the low temperature zone is 500°C to 600°C.

4. The control method of the biomass feeding system based on mercury oxidation atmosphere optimization according to claim 3 is characterized in that: The ignition temperature of the biomass is 300°C.

5. The control method of the biomass feeding system based on mercury oxidation atmosphere optimization according to claim 4 is characterized in that: A dioxin detection device is arranged at the outlet of the furnace to detect the concentration of dioxins.

6. The control method of the biomass feeding system based on mercury oxidation atmosphere optimization according to claim 4 is characterized in that: An HCl detection device is arranged on the inner wall surface of the furnace to detect the HCl concentration in the furnace in real time.

7. The control method of the biomass feeding system based on mercury oxidation atmosphere optimization according to claim 4 is characterized in that: A first mercury real-time monitoring instrument is installed at the inlet of the SCR reactor to obtain a first mercury concentration at the inlet of the SCR reactor; The second mercury real-time monitoring instrument is installed at the outlet of the SCR reactor to obtain the second mercury concentration at the outlet of the SCR reactor.

8. A biomass feeding system based on mercury oxidation atmosphere optimization, characterized in that: include: An acquisition unit, the acquisition unit is used to acquire a first mercury concentration at an inlet of the SCR reactor and acquire a second mercury concentration at an outlet of the SCR reactor; a calculation unit, the calculation unit being used to calculate a mercury removal efficiency of the SCR reactor according to the first mercury concentration and the second mercury concentration, and to calculate a concentration of HCl required for a mercury removal reaction in the SCR reactor according to the mercury removal efficiency of the SCR reactor; A measuring unit, the measuring unit is used to obtain the HCl concentration in the furnace in real time; The control unit is based on the HCl concentration in the furnace, the HCl concentration required for the mercury removal reaction in the SCR reactor, and the designed blending amount M in the furnace. 设计 , the biomass feed amount M in the high temperature zone that reaches the critical point of HCl for high temperature corrosion in the furnace 临界1 and the biomass feed amount M at which the dioxin concentration in the low temperature zone reaches the critical point 临界2 , determine the feed rate of biomass from the high temperature zone and the feed rate of biomass from the low temperature zone.

9. The biomass feeding system based on mercury oxidation atmosphere optimization according to claim 8, characterized in that: The acquisition unit includes a first mercury real-time monitoring instrument and a second mercury real-time monitoring instrument; The first mercury real-time monitoring instrument is used to obtain a first mercury concentration at the inlet of the SCR reactor; The second mercury real-time monitoring instrument is used to obtain a second mercury concentration at the outlet of the SCR reactor.

10. The biomass feeding system based on mercury oxidation atmosphere optimization according to claim 8, characterized in that: The measuring unit is a HCl detection device.

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