Calcium-based dry desulfurization control method

Abstract

The invention relates to a calcium-based dry desulfurization control method. The method comprises the following steps: reducing the hardening condition of calcium powder in a desulfurization and denitrification system of a heating furnace; transforming desulfurization equipment in the desulfurization and denitrification system of the heating furnace; reducing the powder spraying amount in the desulfurization and denitrification system of the heating furnace; optimizing an ash conveying device in the desulfurization and denitrification system of the heating furnace; and adjusting the inspection means of the equipment in the desulfurization and denitrification system of the heating furnace. According to the calcium-based dry desulfurization control method provided by the invention, the technological process of the existing hot rolling heating furnace desulfurization system is analyzed, the smoke exhaust condition of the heating furnace combustion system is combined, the composition characteristics of the calcium-based desulfurization equipment are researched, and the system problem of the calcium-based dry desulfurization equipment of the hot rolling heating furnace is comprehensively considered and analyzed; optimization and improvement are carried out according to the problems, so that the desulfurization efficiency of desulfurization equipment is improved, the operation safety risk coefficient of a desulfurization system is reduced, production material consumption is effectively reduced, the overhaul cost utilization rate is improved, the labor cost of personnel is reduced, the equipment operation stability is improved, and the safety of a heating furnace system is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial furnaces, and in particular to a calcium-based dry desulfurization control method. Background Art

[0002] The desulfurization system for a hot-rolling heating furnace utilizes a calcium-based dry desulfurization process. By spraying a calcium-based ultrafine powder desulfurizer into the corresponding flue gas area, the highly active calcium-based desulfurizer fully contacts and chemically reacts with acidic components such as SO2 and SO3 in the flue gas, solidifying and removing the SO2. The desulfurized powdered product then flows into a bag filter with the airflow to further complete the desulfurization reaction. After purification by the dust collector, the desulfurizer meets emission standards. The desulfurizer uses highly active calcium-based ultrafine powder, allowing it to be used directly without passing through a mill.

[0003] High-efficiency, active calcium-based dry desulfurization technology involves evenly distributing a highly active, ultrafine calcium-based desulfurizer powder within a pipeline. Within the pipeline, the desulfurizer is thermally activated, mixing thoroughly with and contacting the acidic flue gas, resulting in physical and chemical reactions that absorb and purify acidic substances such as SO2. Furthermore, within the flue duct and baghouse, the ultrafine powder desulfurizer continuously reacts with SO2 in the flue gas. Byproducts are collected by the baghouse and transported via pneumatic ash conveying to a centralized ash storage silo for storage. The owner will periodically transport and dispose of these desulfurization byproducts using suction and discharge tank trucks. Due to the nature of the desulfurizer, these desulfurization byproducts are considered general solid waste and can be disposed of in conjunction with desulfurization ash from sintering and pelletizing semi-dry desulfurization systems, or handled by the operation and maintenance unit in accordance with relevant regulations.

[0004] High-activity calcium-based desulfurizer is a new type of simple desulfurization process developed in the past two years. It is suitable for the treatment of low-sulfur flue gas. Its advantage is that the desulfurization by-products are not hazardous waste. However, the process is in its infancy, and there is no unified technical standard for desulfurizers. The performance indicators of products from various desulfurizer manufacturers vary to a certain extent. It is understood that the desulfurization efficiency of highly active calcium-based ultrafine powder also fluctuates under different flue gas temperature conditions, and it needs to be continuously explored and verified in actual applications. High-activity calcium-based desulfurizer is a high-activity calcium-based desulfurizer that is processed from slaked lime into a smaller particle size, a larger specific surface area, and a microporous structure on the surface. It is transported to the flue by nitrogen injection. The flue gas is fully contacted with the highly active calcium-based desulfurizer to undergo a chemical reaction. The SO2 and other acidic media in the flue gas are absorbed and purified, and the CaSO4 by-product formed by desulfurization enters the bag dust collector with the airflow and is captured. The main chemical reaction equations completed in this process are as follows:

[0005] CaO+SO2+1 / 2O2→CaSO4;

[0006] Ca(OH)2+SO2→CaSO3·+H2O;

[0007] CaO+SO2→CaSO3;

[0008] CaSO3+1 / 2O2→CaSO4;

[0009] CaO+SO3→CaSO4;

[0010] 2CaCO3+2SO2+O2→CaSO4+2CO2.

[0011] However, after the heating furnace desulfurization system was put into operation, the amount of calcium powder injected was too large and the desulfurization efficiency was low; the desulfurizer injection unit powder bin had problems with unloading, the injection unit had no backup equipment, and the injection effect could not be detected accordingly; the bag dust collector unit had a large amount of dust accumulation in the dust collector hopper and the dust collector bags were damaged; the desulfurization ash system had problems such as small ash bin volume and low operating efficiency of the pneumatic ash conveying system. Therefore, how to improve the efficient operation of calcium-based dry desulfurization equipment in steel rolling heating furnaces is one of the key research topics in the industrial application of calcium-based dry desulfurization technology. Summary of the Invention

[0012] In view of this, the present invention provides a calcium-based dry desulfurization control method.

[0013] Specifically, the present invention is achieved through the following technical solutions:

[0014] According to a first aspect of the present invention, a calcium-based dry desulfurization control method is provided, the method comprising the steps of:

[0015] Reduce the calcium powder caking in the desulfurization and denitrification system of the heating furnace;

[0016] Renovating the desulfurization equipment in the desulfurization and denitrification system of the heating furnace;

[0017] Reducing the amount of powder sprayed in the desulfurization and denitrification system of the heating furnace;

[0018] Optimize the ash conveying device in the desulfurization and denitrification system of the heating furnace;

[0019] Adjust the equipment inspection means within the heating furnace desulfurization and denitrification system.

[0020] Optionally, the method of reducing calcium powder caking in the desulfurization and denitrification system of the heating furnace comprises the following steps:

[0021] Reducing the water vapor content in the desulfurization and denitrification system of the heating furnace;

[0022] Reduce the calcium powder content in the desulfurization and denitrification system of the heating furnace.

[0023] Optionally, reducing the water vapor content in the heating furnace desulfurization and denitrification system comprises the steps of:

[0024] Lay steel plates at the bottom of the flue;

[0025] A heating device is provided on each ash hopper;

[0026] A heat preservation device is provided on the exposed short pipe between the gate valve of the ash hopper and the feed valve of the AV pump.

[0027] Optionally, reducing the calcium powder content in the heating furnace desulfurization and denitrification system comprises the steps of:

[0028] Optimize the material level alarm function of each ash hopper;

[0029] Reduce the action interval of the air cannon;

[0030] At least one air cannon is provided on each surface of the ash hopper.

[0031] Optionally, the modification of the desulfurization equipment in the heating furnace desulfurization and denitrification system comprises the following steps:

[0032] The plate is integrally processed into a cone structure of the powder bin;

[0033] A spare discharge port is provided at the cone bucket structure;

[0034] Adjust the nitrogen control mode of the power pipeline of the powder silo to automatic control mode;

[0035] Add an observation device to the injection pipeline.

[0036] Optionally, reducing the amount of powder sprayed in the desulfurization and denitrification system of the heating furnace comprises the steps of:

[0037] Adjusting the powder spraying setting parameters in the desulfurization and denitrification system of the heating furnace;

[0038] Adjust the bag blowing setting parameters in the desulfurization and denitrification system of the heating furnace.

[0039] Optionally, the adjusting of the powder spraying setting parameters in the desulfurization and denitrification system of the heating furnace comprises the steps of:

[0040] Reduce the maximum opening of the powder bin screw feeder;

[0041] When the powder bin spiral feeder is opened for a preset time, the opening is reduced to a preset opening.

[0042] Optionally, the adjusting of bag injection setting parameters in the heating furnace desulfurization and denitrification system includes the following steps:

[0043] Increase the injection pressure difference;

[0044] Reduce the frequency of spray cleaning;

[0045] Increase the time between purge cycles.

[0046] Optionally, the optimization of the ash conveying device in the heating furnace desulfurization and denitrification system includes the following steps:

[0047] The air cannon and the feeding valve are arranged in a chain control mode.

[0048] A balance pipeline is arranged between the top of the ash bin and the system pipeline.

[0049] Optionally, the adjusting the equipment inspection means in the desulfurization and denitrification system of the heating furnace comprises the following steps:

[0050] An observation hole is arranged on the cone of the ash bin.

[0051] A visual window is arranged on the top of the ash bin.

[0052] A dredging opening is arranged on the material opening of the ash bin.

[0053] The technical scheme provided by the present application at least brings the following beneficial effects:

[0054] The calcium-based dry desulfurization control method provided by the present application improves the desulfurization efficiency of the desulfurization equipment, reduces the operation safety risk coefficient of the desulfurization system, effectively reduces the consumption of production materials, improves the utilization rate of maintenance costs, reduces the labor cost of personnel, improves the operation stability of the equipment, and effectively ensures the safety of the heating furnace system. BRIEF DESCRIPTION OF DRAWINGS

[0055] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0056] In order to more clearly illustrate the technical schemes in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or related technical descriptions will be briefly introduced. Obviously, other drawings can also be obtained by those skilled in the art without any creative labor, based on these drawings.

[0057] Figure 1 A flowchart of a calcium-based dry desulfurization control method provided by the present application is shown in the figure.

[0058] Figure 2 A structural diagram of a heating furnace desulfurization and denitrification system in a calcium-based dry desulfurization control method provided by the present application is shown in the figure. DETAILED DESCRIPTION

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0060] Figure 1 The following schematically shows a flow chart of a calcium-based dry desulfurization control method applicable to an embodiment of the present invention.

[0061] See also Figure 1 The embodiment of the present invention provides a calcium-based dry desulfurization control method, which may include the following steps:

[0062] S1: Reduce the calcium powder caking in the desulfurization and denitrification system of the heating furnace;

[0063] Exemplarily, the method of reducing the calcium powder caking in the desulfurization and denitrification system of the heating furnace comprises the following steps:

[0064] Reducing the water vapor content in the desulfurization and denitrification system of the heating furnace;

[0065] Reduce the calcium powder content in the desulfurization and denitrification system of the heating furnace.

[0066] like Figure 2 In the embodiment of the present application, the main reason for the difficulty in calcium powder falling off and dust accumulation in the dust collector is the abnormal compaction of calcium powder, which reflects that the water content in the system is high, the relative humidity is high, and water vapor is precipitated after cooling, which increases the viscosity of the accumulated dust, making it difficult for the calcium powder to fall off in the powder bin and ash bin; and the main source of moisture in the system is the flue gas generated during the combustion process of the heating furnace. The flue gas is mixed with water vapor during the flow in the flue, resulting in a high moisture content. It can be seen from the process flow of a hot rolling desulfurization system that all the flue gases of the four heating furnaces share a set of desulfurization powder bin, desulfurization ash bin, desulfurization dust collector and fan system, which will increase the aggregation effect of water vapor in the flue gas. The increase in water vapor aggravates the reaction between calcium powder and water vapor in the flue gas, resulting in serious compaction. There is groundwater seepage at the location of the masonry flue at -11 meters underground, which will cause a large amount of water to precipitate, and enter the system with the flue gas after high-temperature evaporation. Therefore, the calcium powder compaction in the desulfurization and denitrification system of the heating furnace can be reduced mainly by reducing the water vapor content and calcium powder content in the desulfurization and denitrification system of the heating furnace.

[0067] Exemplarily, the step of reducing the water vapor content in the heating furnace desulfurization and denitrification system comprises the following steps:

[0068] Lay steel plates at the bottom of the flue;

[0069] A heating device is arranged on each ash bucket;

[0070] A heat preservation device is arranged on the exposed short pipe between the plug valve of the ash bucket and the feed valve of the AV pump.

[0071] In the embodiment of the present application, since there is groundwater seepage at the position of the underground negative eleven-meter masonry flue, laying a steel plate at the bottom of the flue to isolate the accumulated water can reduce the mixing of water vapor into high-temperature flue gas and reduce the mixing of water vapor into flue gas into the system, thereby fundamentally solving the problem of high water content in the desulfurization system. Adding a set of heating device (such as electric heating) to each ash bucket (the electric heating power of each ash bucket is about 5kW) can reduce the accumulation caused by the low temperature of the ash bucket wall and the condensation of water vapor on the accumulated ash; at the same time, a heat preservation device (such as a heating belt and heat preservation cotton) is added to the exposed short pipe between the plug valve of the ash bucket and the feed valve of the AV pump, which can increase the temperature of this part and thereby reduce the condensation of water vapor and calcium powder.

[0072] Exemplarily, the method for reducing the calcium powder content in the heating furnace desulfurization and denitrification system comprises the steps of:

[0073] Optimizing the material level alarm function of each ash bucket;

[0074] Reducing the action interval time of the air cannon;

[0075] At least one air cannon is arranged on each face of the ash bucket.

[0076] In the embodiment of the present application, in order to improve the ash accumulation sensitivity of the ash bucket during system operation and promote the timely ash discharge of the ash bucket of the dust collector, the alarm screen needs to be optimized, the low material level alarm display function and the high material level alarm display function are optimized, so that once there is an alarm, the alarm will continue to flash red, and at the same time, the accumulated ash is prevented from exceeding the high material level; the air cannon of the current ash bucket is upgraded and optimized, the action interval time of the air cannon is reduced from 12 hours / time to 0.5 hours / time, and the air cannon is increased, so that each face of the ash bucket has an air inlet point of the air cannon, and when the ash is hung, the compressed air flow of the air cannon can blow the hung ash down, thereby reducing the calcium powder content in the heating furnace desulfurization and denitrification system.

[0077] S2: modifying the desulfurization equipment in the heating furnace desulfurization and denitrification system;

[0078] Exemplarily, the method for modifying the desulfurization equipment in the heating furnace desulfurization and denitrification system comprises the steps of:

[0079] The plate is integrally processed into a conical bucket structure of the powder bin;

[0080] A standby discharge port is arranged at the conical bucket structure;

[0081] The nitrogen control mode of the power pipeline of the powder bin is adjusted to an automatic control mode.

[0082] Add an observation device to the injection pipeline.

[0083] In the examples of this application, by reviewing and analyzing the physical structures and drawings of the powder silo and ash silo, the following problems were found: (1) The design and installation of the cone bucket structure of the powder silo were unreasonable, and there were multiple transverse welds at the cone bucket position, which increased the resistance to powder drop; (2) The nitrogen pipeline as the power source for conveying calcium powder was unreasonable; (3) The actual powder spraying status of the powder spraying process under the current equipment structure was not properly monitored. All of the above problems will lead to difficulty in powder drop. In order to solve the above problems, the desulfurization equipment needs to be modified as follows: (1) The cone bucket structure position of the powder bin is modified. The cone bucket structure is changed from a multi-jointed structure to a plate integrally processed cone bucket structure to reduce friction resistance and reduce the impact of resistance on material drop. At the same time, the cone bucket position is optimized and a spare discharge port is added; (2) The nitrogen control mode of the power pipeline of the powder bin is optimized. The nitrogen flow control mode is changed from manual control to automatic control to improve the precise control of nitrogen volume and effectively ensure the calcium powder input injection effect; (3) The calcium powder injection effect is effectively verified by adding an observation device at the injection pipeline. The observation device consists of a ball valve, an elbow and a pipeline. When the calcium powder injection effect is uncertain, the ball valve can be manually opened to verify whether the calcium powder is sprayed out.

[0084] S3: reducing the amount of powder sprayed in the desulfurization and denitrification system of the heating furnace;

[0085] Exemplarily, the step of reducing the amount of powder sprayed in the desulfurization and denitrification system of the heating furnace comprises the following steps:

[0086] Adjusting the powder spraying setting parameters in the desulfurization and denitrification system of the heating furnace;

[0087] Adjust the bag blowing setting parameters in the desulfurization and denitrification system of the heating furnace.

[0088] In the embodiment of the present application, the bag of the desulfurization dust collector is provided with a spray cleaning device, and the interval time of the spray setting parameters is short, which will cause the calcium powder to adhere to the bag for a short time, resulting in an increase in the use of the desulfurizer. Therefore, it is necessary to adjust the powder spray setting parameters and the bag blowing setting parameters in the desulfurization and denitrification system of the heating furnace.

[0089] Exemplarily, the adjusting of the powder spraying setting parameters in the desulfurization and denitrification system of the heating furnace includes the following steps:

[0090] Reduce the maximum opening of the powder bin screw feeder;

[0091] When the powder bin spiral feeder is opened for a preset time, the opening is reduced to a preset opening.

[0092] In an embodiment of the present application, in order to control the maximum powder spraying amount, the opening of the powder bin spiral feeder is reduced from 100% to a maximum of 70%. When the opening exceeds 65% and lasts for 2 minutes, the default powder spraying amount meets the system response requirements, and the opening of the powder bin spiral feeder is reduced to 50%.

[0093] Exemplarily, the adjusting of the bag injection setting parameters in the desulfurization and denitrification system of the heating furnace includes the following steps:

[0094] Increase the injection pressure difference;

[0095] Reduce the frequency of spray cleaning;

[0096] Increase the time between purge cycles.

[0097] In an embodiment of the present application, the blowing pressure difference of the bag is increased from 700-900Pa to 800-1000Pa, reducing the frequency of blowing and cleaning, thereby reducing the amount of powder used; the blowing cycle interval is increased from 60min to 90min, increasing the reaction time, thereby reducing the amount of powder used.

[0098] S4: Optimizing the ash conveying device in the desulfurization and denitrification system of the heating furnace;

[0099] Exemplarily, the optimization of the ash conveying device in the heating furnace desulfurization and denitrification system includes the following steps:

[0100] Set the air cannon and feed valve to interlock control mode;

[0101] Add a balancing pipe between the top of the ash silo and the system pipeline.

[0102] In the embodiment of the present application, after the desulfurization ash accumulates in the ash hopper, the desulfurization ash is not transported in time, resulting in transportation difficulties. Upon investigation, it was found that the air cannon system and the ash cleaning system of the dust collector unit currently have no logical control relationship with the pneumatic ash conveying system, and can only act independently, which will lead to discontinuous actions and cause the problem of untimely ash delivery. In order to solve this problem, it is necessary to optimize and improve the control logic of the ash conveying system, interlock the air cannon and the feed valve so that they are both opened at the same time, increase the feed volume, and reduce ash accumulation in the ash hopper; optimize the top of the ash bin, and add a balancing pipeline between the top of the ash bin and the system pipeline to ensure that the ash bin is not pressurized and improve the ash conveying efficiency of the pneumatic ash conveying system.

[0103] S5: Adjust the equipment inspection means in the desulfurization and denitrification system of the heating furnace.

[0104] Exemplarily, the adjusting of the equipment inspection means in the heating furnace desulfurization and denitrification system includes the following steps:

[0105] An observation hole is provided on the cone of the ash hopper;

[0106] A visual window is provided on the top of the ash bin;

[0107] A dredging port is provided at the material port of the ash bin.

[0108] In the embodiment of the present application, the dust falling and accumulation in the dust collector hopper are checked by adding a quick-connect observation hole on the cone hopper to check the negative pressure and dust accumulation in the hopper. If there is a small negative pressure or no negative pressure, it can be dealt with in time; a visual window is added on the top of the ash bin to observe the actual liquid level of the ash bin and to timely understand the working condition of the ash conveying system; a quick dredging port is added to the ash bin material port to enable effective manual dredging and improve the material dropping effect.

[0109] The present application provides a calcium-based dry desulfurization control method. By analyzing the process flow of a current hot rolling heating furnace desulfurization system, combining the smoke exhaust conditions of the heating furnace combustion system, studying the composition characteristics of the calcium-based desulfurization equipment, and comprehensively considering and analyzing the system problems of the calcium-based dry desulfurization equipment of a hot rolling heating furnace, the method is optimized and improved based on the problems, thereby improving the desulfurization efficiency of the desulfurization equipment, reducing the safety risk factor of the desulfurization system operation, effectively reducing the consumption of production materials, improving the utilization rate of maintenance costs, reducing personnel labor costs, improving the stability of equipment operation, and effectively ensuring the safety of the heating furnace system.

[0110] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0111] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A calcium-based dry desulfurization control method, characterized in that: The method comprises the steps of: Reduce the calcium powder caking in the desulfurization and denitrification system of the heating furnace; Renovating the desulfurization equipment in the desulfurization and denitrification system of the heating furnace; Reducing the amount of powder sprayed in the desulfurization and denitrification system of the heating furnace; Optimize the ash conveying device in the desulfurization and denitrification system of the heating furnace; Adjust the equipment inspection means within the heating furnace desulfurization and denitrification system.

2. The calcium-based dry desulfurization control method according to claim 1, characterized in that: The method of reducing the calcium powder caking in the desulfurization and denitrification system of the heating furnace comprises the following steps: Reducing the water vapor content in the desulfurization and denitrification system of the heating furnace; Reduce the calcium powder content in the desulfurization and denitrification system of the heating furnace.

3. The calcium-based dry desulfurization control method according to claim 2, characterized in that: The step of reducing the water vapor content in the heating furnace desulfurization and denitrification system comprises the following steps: Lay steel plates at the bottom of the flue; A heating device is provided on each ash hopper; A heat preservation device is provided on the exposed short pipe between the gate valve of the ash hopper and the feed valve of the AV pump.

4. The calcium-based dry desulfurization control method according to claim 2, characterized in that: The method of reducing the calcium powder content in the desulfurization and denitrification system of the heating furnace comprises the following steps: Optimize the material level alarm function of each ash hopper; Reduce the action interval of the air cannon; At least one air cannon is provided on each surface of the ash hopper.

5. The calcium-based dry desulfurization control method according to claim 1, characterized in that: The modification of the desulfurization equipment in the desulfurization and denitrification system of the heating furnace comprises the following steps: The plate is integrally processed into a cone structure of the powder bin; A spare discharge port is provided at the cone bucket structure; Adjust the nitrogen control mode of the power pipeline of the powder silo to automatic control mode; Add an observation device to the injection pipeline.

6. The calcium-based dry desulfurization control method according to claim 1, characterized in that: The method of reducing the amount of powder sprayed in the desulfurization and denitrification system of the heating furnace comprises the following steps: Adjusting the powder spraying setting parameters in the desulfurization and denitrification system of the heating furnace; Adjust the bag injection setting parameters in the desulfurization and denitrification system of the heating furnace.

7. The calcium-based dry desulfurization control method according to claim 6, characterized in that: The adjustment of the powder spraying setting parameters in the desulfurization and denitrification system of the heating furnace includes the following steps: Reduce the maximum opening of the powder silo feeder; When the powder bin spiral feeder is opened for a preset time, the opening is reduced to a preset opening.

8. The calcium-based dry desulfurization control method according to claim 6, characterized in that: The step of adjusting the bag injection setting parameters in the desulfurization and denitrification system of the heating furnace includes the following steps: Increase the injection pressure difference; Reduce the frequency of spray cleaning; Increase the time between purge cycles.

9. The calcium-based dry desulfurization control method according to claim 1, characterized in that: The optimization of the ash conveying device in the heating furnace desulfurization and denitrification system includes the following steps: Set the air cannon and feed valve to interlock control mode; Add a balancing pipe between the top of the ash silo and the system pipeline.

10. The calcium-based dry desulfurization control method according to claim 1, characterized in that: The adjusting means for inspecting the equipment in the desulfurization and denitration system of the heating furnace comprises the following steps: An observation hole is provided on the cone of the ash hopper; A visual window is provided on the top of the ash bin; A dredging port is provided at the material port of the ash bin.

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