Saturated dual-purpose steam boiler and temperature control method thereof

Abstract

The invention relates to the technical field of boilers, in particular to a saturated dual-purpose steam boiler and a temperature control method thereof.The temperature control method comprises the following steps that S1, initial parameters are set, and the fuel quantity is calculated; s2, starting a steam generator to generate saturated steam; s3, a steam superheater is started in a linkage mode to generate superheated steam in a linkage mode; s4, tracking parameters to perform dynamic interlocking regulation and control and load management; and S5, after the superheated steam is output, the system is shut down in sequence for shutdown. The system has the beneficial effects that saturated steam and superheated steam under different working conditions can be produced, the second boiler shares the smoke outlet of the first boiler through the design of the flue, the maintenance cost is reduced, meanwhile, the energy utilization rate is increased, the superheated steam temperature can be accurately controlled, and the applicability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of boilers, and in particular to a saturated dual-purpose steam boiler and a temperature control method thereof. Background Art

[0002] Boilers play a key role in industrial production and can produce saturated steam and superheated steam to meet different production needs. When water is heated in the boiler, the thermal motion of water molecules intensifies. When it reaches a certain temperature, the water begins to vaporize and form steam. Saturated steam enters the superheater and further absorbs heat in the high-temperature flue gas area. The temperature continues to rise and exceeds the saturation temperature at the pressure, and it becomes superheated steam. Superheated steam has unique advantages in work and heat transfer efficiency, and is more suitable for industrial processes that require high steam quality.

[0003] In the prior art, saturated steam or superheated steam is usually produced by different boiler equipment respectively. In a scenario where saturated steam and superheated steam are required at the same time, a single boiler equipment cannot meet the usage requirements and cannot control the temperature of the superheated steam. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present application proposes a saturated dual-purpose steam boiler and a temperature control method thereof, which can produce saturated steam and superheated steam under different working conditions. Through the design of the flue, the second boiler shares the exhaust port of the first boiler, thereby reducing maintenance costs and improving energy utilization. The superheated steam temperature can be accurately controlled, thereby improving applicability.

[0005] The following is the technical solution of the present invention, a temperature control method for a saturated dual-purpose steam boiler, comprising the following steps: S1. Initial parameter setting and calculation of fuel quantity; S2, start the steam generator to generate saturated steam; S3, start the steam superheater to generate superheated steam; S4, tracking parameters for dynamic interlocking regulation and load management; S5. After outputting superheated steam, shut down the system in sequence.

[0006] As a preferred solution of the present invention, the parameters include pressure ,temperature and flow , the calculation expression of fuel quantity is as follows: In the above formula, is the fuel quantity for the steam generator, is the fuel quantity for the steam superheater, is the calorific value of fuel, They are superheated steam enthalpy, saturated steam enthalpy and feed water enthalpy respectively.

[0007] As a preferred solution of the present invention, S2 includes: starting the steam generator, and slowly increasing the combustion rate from the initial value to ≤min( ,50%), the combustion rate is controlled by closed-loop control of saturated steam pressure until the superheated steam pressure ≤ and stable; in, is the firing rate of the steam generator.

[0008] As a preferred solution of the present invention, S3 includes: starting the steam superheater combustion rate to ≤min( ,50%), the combustion rate is controlled by closed-loop control of superheated steam temperature, so that the superheated steam temperature ≤ -15℃ for 5 minutes. During the loading process, when the steam superheater protection temperature is greater than the set value -30℃, the load is reduced. > +5% forced reduction to +5%; in, is the firing rate of the steam superheater.

[0009] As a preferred solution of the present invention, in S4, the steam generator tracks the superheated steam pressure to , the steam superheater tracks the superheated steam temperature, making the hot steam temperature -15℃ to +10℃, while monitoring and executing chain strategies in real time.

[0010] As a preferred solution of the present invention, the chain strategy includes: The first interlocking strategy is to reduce the steam superheater combustion rate when the steam superheater protection temperature is greater than the set value -35°C during the load addition and subtraction process; Second interlocking strategy, superheated steam temperature> At +3℃, reduce the steam superheater combustion rate; The third interlocking strategy is to reduce the steam superheater combustion rate loading rate when the superheated steam temperature increase rate is large; The fourth interlocking strategy is that when loading, the steam generator is loaded first, and when unloading, the steam superheater is unloaded first; The fifth interlocking strategy is to load or reduce the steam generator and steam superheater by ≤5% at one time.

[0011] A saturated dual-purpose steam boiler, comprising: The first boiler is used to burn fuel to produce flue gas and convert liquid water into steam through heat exchange; The second boiler is used to burn fuel to heat saturated steam into superheated steam; A smoke exhaust port, used to discharge smoke generated by the boiler, connected to the first boiler; A flue, used for introducing the flue gas of the second boiler into the first boiler, connecting the first boiler and the second boiler; The steam-water separator is used to separate water droplets from the steam to obtain purer and drier saturated steam, and is connected to the first boiler and the second boiler; Drainage equipment, used to discharge condensed water separated by the steam-water separator and prevent steam leakage, connected to the steam-water separator; The saturated steam outlet is used to discharge saturated steam and is connected to the steam-water separator and the second boiler; A water supply device, used for supplying water to the first boiler and the second boiler, and connecting the first boiler and the second boiler; Overpressure discharge equipment, used to discharge superheated steam to reduce the pressure in the second boiler, connected to the second boiler; The superheated steam outlet is used to discharge the superheated steam and is connected to the second boiler.

[0012] As a preferred solution of the present invention, it also includes: The first valve is used to control the on-off of saturated steam and the saturated steam outlet, and is arranged in the pipeline between the saturated steam outlet and the steam-water separator; The second valve is used to control the on / off of the saturated steam and the second boiler and is arranged in the pipeline between the steam-water separator and the second boiler; The third valve is used to control the on-off of the superheated steam and the regulating valve, and is arranged in the pipeline between the second boiler and the superheated steam outlet; The regulating valve is used to control the discharge of superheated steam and is arranged in the pipeline between the third valve and the superheated steam outlet.

[0013] As a preferred solution of the present invention, the first boiler is provided with a steam generator, and the second boiler is provided with a steam superheater; the first valve is opened, and the second valve, the third valve and the regulating valve are closed, and the saturated steam separated by the steam-water separator is sent out through the saturated steam outlet; when the first valve is closed and the second valve, the third valve and the regulating valve are opened, the saturated steam separated by the steam-water separator enters the second boiler through the second valve and is heated into superheated steam, and then the superheated steam is sent out through the third valve and the regulating valve to the superheated steam outlet.

[0014] As a preferred solution of the present invention, the drain valve of the drain equipment automatically opens to discharge condensed water, and the expression is as follows: In the above formula, is the discharge capacity of the steam trap, is the flow coefficient of the steam trap, is the pressure difference between the inlet and outlet of the steam trap, is the density of condensed water, and is the empirical coefficient, is the temperature difference between steam and condensate; is 0.9, is 0.01.

[0015] The beneficial effects of the present invention are: 1. The present invention can produce saturated steam and superheated steam under different working conditions. When producing superheated steam, an external independent steam superheater is used, and the second boiler shares the exhaust port of the first boiler through the design of the flue, thereby reducing the boiler system cost and the flue gas treatment and maintenance cost. At the same time, the flue gas waste heat of the second boiler can be effectively utilized, thereby improving the applicability and energy utilization rate; 2. The superheated steam of the present invention adopts a flame temperature control mode, which can accurately control the temperature of the superheated steam and improve the applicability; 3. The present invention eliminates the mode of using a water spray desuperheater to control the superheat temperature in traditional superheaters. The water spray desuperheater is prone to cause material fatigue and failure due to alternating hot and cold conditions, which can lead to safety accidents. The dryness of the steam-water separator can reach more than 99.5%, reducing the requirements of superheated steam on the feed water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a saturated dual-purpose steam boiler of the present invention; Figure 2 This is an operation control diagram of the saturated dual-purpose steam boiler of the present invention; Figure 3 It is a flow chart of the temperature control method of the saturated dual-purpose steam boiler of the present invention; In the figure: 1. First boiler; 2. Second boiler; 3. Flue; 4. Smoke exhaust port; 5. Steam-water separator; 6. Drainage equipment; 7. Water supply equipment; 8. Saturated steam outlet; 9. Overpressure discharge equipment; 10. Superheated steam outlet; 11. First valve; 12. Second valve; 13. Third valve; 14. Control valve. DETAILED DESCRIPTION

[0017] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0018] Embodiment 1: like Figure 1 and Figure 2 As shown, a saturated dual-purpose steam boiler comprises: The first boiler 1 is used to burn fuel to generate flue gas, convert liquid water into steam through heat exchange, and is connected to a steam-water separator 5, a smoke outlet 4 and a flue 3; A smoke exhaust port 4, used for exhausting smoke generated by the boiler, connected to the first boiler 1; A flue 3, used for introducing the flue gas of the second boiler 2 into the first boiler 1, connecting the first boiler 1 and the second boiler 2; The steam-water separator 5 is used to separate water droplets from the steam to obtain purer and drier saturated steam, and is connected to the first boiler 1, the saturated steam outlet 8 and the second boiler 2; A drain device 6, used to discharge condensed water separated by the steam-water separator 5 and prevent steam leakage, connected to the steam-water separator 5; The first valve 11 is used to control the on-off of the saturated steam and the saturated steam outlet 8, and is arranged in the pipeline between the saturated steam outlet 8 and the steam-water separator 5; A saturated steam outlet 8, used for discharging saturated steam, connected to the steam-water separator 5 and the second boiler 2; The second valve 12 is used to control the on / off of the saturated steam and the second boiler 2, and is arranged in the pipeline between the steam-water separator 5 and the second boiler 2; The second boiler 2 is used for burning fuel to heat saturated steam into superheated steam, and is connected to a flue 3, a water supply device 7, a superheated steam outlet 10 and an overpressure discharge device 9; A water supply device 7, used for supplying water to the first boiler 1 and the second boiler 2, connecting the first boiler 1 and the second boiler 2; Overpressure discharge equipment 9, used for discharging superheated steam to reduce the pressure in the second boiler 2, connected to the second boiler 2; The third valve 13 is used to control the on-off of the superheated steam and the regulating valve 14, and is arranged in the pipeline between the second boiler 2 and the superheated steam outlet 10; The regulating valve 14 is used to control the discharge of the superheated steam and is arranged in the pipeline between the third valve 13 and the superheated steam outlet 10; The superheated steam outlet 10 is used to discharge the superheated steam and is connected to the second boiler 2 .

[0019] In this embodiment, the first boiler 1 is provided with a steam generator, which burns fuel to generate high-temperature flue gas. The high-temperature flue gas generated by the fuel combustion has a large amount of heat energy, which is transferred to the water in the steam generator through a heat exchanger, radiation, convection, etc. When the water absorbs enough heat and the temperature rises to the boiling point, the water molecules change from liquid to gas to form steam. When the first valve 11 is opened and the second valve 12, the third valve 13 and the regulating valve 14 are closed, the saturated steam separated by the steam-water separator 5 is sent out through the saturated steam outlet 8.

[0020] In this embodiment, the smoke outlet 4 discharges the smoke of the first boiler 1 and the second boiler 2. When the first boiler 1 and the second boiler 2 are in operation, the fuel burns in the furnace to generate a large amount of combustion exhaust gas, which contains carbon dioxide, water vapor, sulfur dioxide, nitrogen oxides and incompletely burned particulate matter. The main function of the smoke outlet 4 is to smoothly discharge the exhaust gas generated by these combustions from the boiler system so that the combustion process in the boiler can be carried out continuously and stably. The smoke outlet 4 adjusts the pressure in the furnace by controlling the exhaust gas discharge to keep it within a suitable range. When the pressure in the furnace is too high, the exhaust gas discharge is increased through the smoke outlet 4 to reduce the furnace pressure; when the pressure is too low, the exhaust gas discharge is appropriately reduced to maintain the pressure stable, avoid flame ejection, air leakage and other problems caused by abnormal furnace pressure, and ensure the safety and stability of boiler operation. At the same time, the second boiler 2 shares the smoke outlet 4 of the first boiler 1, which can facilitate the centralized discharge and treatment of smoke, which can not only simplify the boiler system structure, but also reduce the boiler system cost and smoke treatment maintenance cost.

[0021] In this embodiment, the flue 3 guides the flue gas of the second boiler 2 into the first boiler 1. The design of the flue 3 enables the second boiler 2 to share the exhaust port 4 of the first boiler 1, thereby reducing the boiler system cost and the flue gas treatment and maintenance cost. At the same time, compared with directly discharging the flue gas of the second boiler 2, the flue gas of the second boiler 2 is discharged into the first boiler 1 and mixed with the flue gas of the first boiler 1, which can effectively utilize the flue gas waste heat of the second boiler 2 and improve energy utilization.

[0022] In this embodiment, the steam-water separator 5 separates water droplets from the steam to obtain purer and drier saturated steam. The steam generated from the steam generator of the first boiler 1 often carries some moisture. The steam-water separator 5 can separate the moisture entrained in the steam to make the steam drier and purer, reduce the water content in the steam, and improve the dryness of the steam. When the water content in the steam is too high, in order to achieve the same process effect, more steam may be required, thereby increasing energy consumption. At the same time, dry steam can improve heat transfer efficiency, enable the equipment to perform better, and improve production efficiency. The separated condensed water can be discharged in time through the drainage device to prevent the condensed water from accumulating in the system, avoiding problems such as pipeline corrosion and blockage caused by the accumulation of condensed water, and reducing the system maintenance cost and maintenance workload.

[0023] In this embodiment, the drain device 6 is used to discharge the condensed water separated by the steam-water separator 5. The steam generated by the boiler will condense into water due to the decrease in temperature during pipeline transportation and equipment use. If the condensed water is retained in equipment such as heat exchangers, it will occupy the heat exchange area, affect the heat transfer between the steam and the heated medium, and reduce the efficiency of the equipment. The drain device 6 can discharge the condensed water in time to prevent it from accumulating in the pipeline and equipment. The steam trap automatically opens to discharge the condensed water, and the expression is as follows: In the above formula, is the discharge capacity of the steam trap, is the flow coefficient of the steam trap, is the pressure difference between the inlet and outlet of the steam trap, is the density of condensed water, and is the empirical coefficient, is the temperature difference between steam and condensed water. In this embodiment, is 0.9, is 0.01.

[0024] In this embodiment, the first valve 11 is arranged in the pipeline between the saturated steam outlet 8 and the steam-water separator 5, and is used to control the on-off of the saturated steam and the saturated steam outlet 8; the second valve 12 is arranged in the pipeline between the steam-water separator 5 and the second boiler 2, and is used to control the on-off of the saturated steam and the second boiler 2; the third valve 13 is arranged in the pipeline between the second boiler 2 and the superheated steam outlet 10, and is used to control the on-off of the superheated steam and the regulating valve 14. When the first valve 11 is opened, the second valve 12, the third valve 13 and the regulating valve 14 are closed, and the saturated steam separated by the steam-water separator 5 is sent out through the saturated steam outlet 8; when the first valve 11 is closed, the second valve 12, the third valve 13 and the regulating valve 14 are opened, the saturated steam separated by the steam-water separator 5 enters the second boiler 2 through the second valve 12 to be heated into superheated steam, and then the superheated steam is sent out to the superheated steam outlet 10 through the third valve 13 and the regulating valve 14.

[0025] In this embodiment, the second boiler 2 is provided with a steam superheater, the function of which is to further heat the saturated steam to make it superheated steam, remove the moisture in the steam, improve the dryness and purity of the steam, and thus improve the quality of the steam. The temperature and enthalpy of the superheated steam are higher than those of the saturated steam, and it has higher energy. When the first valve 11 is closed, and the second valve 12, the third valve 13 and the regulating valve 14 are opened, the saturated steam separated by the steam-water separator 5 enters the second boiler 2 through the second valve 12 to be heated into superheated steam, and then the superheated steam is sent out to the superheated steam outlet 10 through the third valve 13 and the regulating valve 14.

[0026] In this embodiment, the water supply device 7 is used to deliver water to the first boiler 1 and the second boiler 2. The first boiler 1 generates steam, which causes the amount of water in the first boiler 1 to continue to decrease. During the operation of the second boiler 2, steam is continuously output for heating saturated steam, which causes the amount of water in the second boiler 2 to continue to decrease. The water supply device 7 can timely and stably replenish the required water to the first boiler 1 and the second boiler 2 to maintain the boiler water level within a normal range and ensure the continuous operation of the first boiler 1 and the second boiler 2.

[0027] In this embodiment, the overpressure discharge device 9 is used to discharge superheated steam to reduce the pressure in the second boiler 2. During the operation of the second boiler 2, the internal pressure may rise sharply due to fuel supply, load changes, etc. When the pressure exceeds the tolerance limit of the second boiler 2, it will cause serious damage to the furnace body, pipelines, pipe fittings and other related equipment of the second boiler 2. The overpressure discharge device 9 can automatically open when the pressure reaches the set safety value, discharge part of the steam in the second boiler 2, quickly reduce the pressure in the furnace, prevent the equipment from being damaged due to overpressure, and protect the integrity and safety of the equipment.

[0028] In this embodiment, the regulating valve 14 is arranged in the pipeline between the third valve 13 and the superheated steam outlet 10, and is used to control the discharge of the superheated steam. The regulating valve 14 can accurately control the discharge flow of the superheated steam. When the load of the downstream equipment at the superheated steam outlet 10 increases and more superheated steam is needed, the regulating valve 14 can be opened to allow more steam to flow into the downstream equipment; conversely, when the load decreases, the regulating valve 14 is closed to reduce the output of the superheated steam. The steam pressure at the discharge port is adjusted by changing the discharge volume of the steam. When the superheated steam pressure increases, the regulating valve 14 is appropriately opened to increase the discharge volume of the superheated steam and reduce the pressure; when the pressure decreases, the regulating valve 14 is closed to reduce the discharge of the superheated steam and increase the pressure.

[0029] Embodiment 2 like Figure 3 As shown, a temperature control method for a saturated dual-purpose steam boiler comprises the following steps: S1. Initial parameter setting and calculation of fuel quantity; S2, start the steam generator to generate saturated steam; S3, start the steam superheater to generate superheated steam; S4, tracking parameters for dynamic interlocking regulation and load management; S5. After outputting superheated steam, shut down the system in sequence.

[0030] In step S1, the initial parameters are set and the fuel quantity is calculated. Specifically, the target superheated steam parameters are input. The superheated steam parameters include pressure ,temperature ,flow , calculate the saturated steam pressure based on the enthalpy difference algorithm, and calculate the fuel quantity of the steam generator of the first boiler 1 and the steam superheater of the second boiler 2 respectively , And the corresponding combustion rate , , the expression is as follows: In the above formula, is the fuel quantity for the steam generator, is the fuel quantity for the steam superheater, is the calorific value of fuel, They are superheated steam enthalpy, saturated steam enthalpy and feed water enthalpy respectively.

[0031] In the above formula, is the firing rate of the steam generator, is the maximum fuel quantity of the steam generator, is the firing rate of the steam superheater, The maximum fuel quantity for the steam superheater.

[0032] In step S2, the steam generator is started to generate saturated steam. Specifically, the steam generator is started, the first valve 11 is opened, the second valve 12, the third valve 13 and the regulating valve 14 are closed, and the combustion rate is slowly increased from the initial value to ≤min( ,50%), the combustion rate is controlled by closed-loop control of saturated steam pressure until the superheated steam pressure ≤ And stable.

[0033] In step S3, the steam superheater is started to generate superheated steam. Specifically, the first valve 11 is closed, the second valve 12, the third valve 13 and the regulating valve 14 are opened, and the steam superheater combustion rate is started to ≤min( ,50%), the combustion rate is controlled by closed loop superheated steam temperature, while monitoring interlock conditions: Superheated steam temperature ≤ Maintain at -15℃ for 5 minutes; During the loading process, when the steam superheater protection temperature is greater than the set value -30℃, the load is reduced; > +5% is forced to reduce to +5%.

[0034] In step S4, the tracking parameters are used for dynamic interlocking regulation and load management. Specifically, the automatic control mode is switched on, and the steam generator tracks the superheated steam pressure to , the steam superheater tracks the superheated steam temperature to (scope -15℃ to +10℃); The following chain strategies are executed in real time during operation, including: First interlocking strategy: during the process of adding or reducing load, when the steam superheater protection temperature is greater than the set value -35℃, the steam superheater combustion rate is reduced; Second interlocking strategy: Superheated steam temperature> At +3℃, reduce the steam superheater combustion rate; The third interlocking strategy: when the rate of increase of superheated steam temperature is large, the loading rate of steam superheater combustion rate is reduced; Fourth interlocking strategy: when loading, the steam generator is loaded first, and when unloading, the steam superheater is unloaded first; Fifth interlocking strategy: the steam generator and steam superheater are loaded or unloaded at one time ≤5%; Among them, the first and second interlocking strategies are for over-temperature load reduction, the third interlocking strategy limits the temperature rise rate, the fourth interlocking strategy sets load priority control, and the fifth interlocking strategy sets a single load adjustment less than or equal to 5%.

[0035] In step S5, after the superheated steam is output, the system is shut down in sequence. Specifically, when shutting down, the steam superheater is first shut down and the second valve 12, the third valve 13 and the regulating valve 14 are closed, and then the steam generator is shut down and the first valve 11 is switched to discharge the residual saturated steam to ensure safe cooling of the equipment.

[0036] The present invention can produce saturated steam and superheated steam under different working conditions. When producing superheated steam, an external independent steam superheater is used, and the design of the flue 3 allows the second boiler 2 to share the exhaust port 4 of the first boiler 1, reducing the boiler system cost and flue gas treatment and maintenance cost. At the same time, it can effectively utilize the flue gas waste heat of the second boiler 2, improving applicability and energy utilization. The mode of using a water spray desuperheater to control the superheat temperature of the traditional superheater is cancelled. The water spray desuperheater is prone to material fatigue due to alternating hot and cold, causing material failure and safety accidents. The dryness of the steam-water separator 5 can reach more than 99.5%, reducing the requirements of superheated steam on the feed water quality.

[0037] Although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are known. Obviously, various changes and modifications may be made to the present invention by those skilled in the art without departing from the spirit and scope of the present invention. Thus, the present invention is intended to include such changes and modifications if they fall within the scope of the technical equivalents of the present invention.

Claims

1. A temperature control method for a saturated dual-purpose steam boiler, characterized in that: The following steps are involved: S1. Initial parameter setting and calculation of fuel quantity; S2, start the steam generator to generate saturated steam; S3, start the steam superheater to generate superheated steam; S4, tracking parameters for dynamic interlocking regulation and load management; S5. After outputting superheated steam, shut down the system in sequence.

2. The temperature control method of a saturated dual-purpose steam boiler according to claim 1, characterized in that: Parameters include pressure ,temperature and flow , the calculation expression of fuel quantity is as follows: In the above formula, is the fuel quantity for the steam generator, is the fuel quantity for the steam superheater, is the calorific value of fuel, They are superheated steam enthalpy, saturated steam enthalpy and feed water enthalpy respectively.

3. The temperature control method of a saturated dual-purpose steam boiler according to claim 2, characterized in that S2 include: Start the steam generator and slowly increase the combustion rate from the initial value to ≤min( ,50%), the combustion rate is controlled by closed-loop control of saturated steam pressure until the superheated steam pressure ≤ and stable; in, is the firing rate of the steam generator.

4. The temperature control method of a saturated dual-purpose steam boiler according to claim 2 is characterized in that: S3 includes: starting the steam superheater combustion rate to ≤min( ,50%), the combustion rate is controlled by closed-loop control of superheated steam temperature, so that the superheated steam temperature ≤ -15℃ for 5 minutes. During the loading process, when the steam superheater protection temperature is greater than the set value -30℃, the load is reduced. > +5% forced reduction to +5%; in, is the firing rate of the steam superheater.

5. The temperature control method of a saturated dual-purpose steam boiler according to claim 2, characterized in that: In S4, the steam generator tracks the superheated steam pressure to , the steam superheater tracks the superheated steam temperature, making the hot steam temperature -15℃ to +10℃, while monitoring and executing chain strategies in real time.

6. The temperature control method of a saturated dual-purpose steam boiler according to claim 5, characterized in that: Chain strategies include: The first interlocking strategy is to reduce the steam superheater combustion rate when the steam superheater protection temperature is greater than the set value -35°C during the load addition and subtraction process; Second interlocking strategy, superheated steam temperature> At +3℃, reduce the steam superheater combustion rate; The third interlocking strategy is to reduce the steam superheater combustion rate loading rate when the superheated steam temperature increase rate is large; The fourth interlocking strategy is that when loading, the steam generator is loaded first, and when unloading, the steam superheater is unloaded first; The fifth interlocking strategy is to load or reduce the steam generator and steam superheater by ≤5% at one time.

7. A saturated dual-purpose steam boiler, applicable to the temperature control method of a saturated dual-purpose steam boiler according to any one of claims 1 to 6, characterized in that: include: The first boiler is used to burn fuel to produce flue gas and convert liquid water into steam through heat exchange; The second boiler is used to burn fuel to heat saturated steam into superheated steam; A smoke exhaust port, used to discharge smoke generated by the boiler, connected to the first boiler; A flue, used for introducing the flue gas of the second boiler into the first boiler, connecting the first boiler and the second boiler; The steam-water separator is used to separate water droplets from the steam to obtain purer and drier saturated steam, and is connected to the first boiler and the second boiler; Drainage equipment, used to discharge condensed water separated by the steam-water separator and prevent steam leakage, connected to the steam-water separator; The saturated steam outlet is used to discharge saturated steam and is connected to the steam-water separator and the second boiler; A water supply device, used for supplying water to the first boiler and the second boiler, and connecting the first boiler and the second boiler; Overpressure discharge equipment, used to discharge superheated steam to reduce the pressure in the second boiler, connected to the second boiler; The superheated steam outlet is used to discharge the superheated steam and is connected to the second boiler.

8. A saturated dual-purpose steam boiler according to claim 7, characterized in that: Also includes: The first valve is used to control the on-off of saturated steam and the saturated steam outlet, and is arranged in the pipeline between the saturated steam outlet and the steam-water separator; The second valve is used to control the on / off of the saturated steam and the second boiler and is arranged in the pipeline between the steam-water separator and the second boiler; The third valve is used to control the on-off of the superheated steam and the regulating valve, and is arranged in the pipeline between the second boiler and the superheated steam outlet; The regulating valve is used to control the discharge of superheated steam and is arranged in the pipeline between the third valve and the superheated steam outlet.

9. A saturated dual-purpose steam boiler according to claim 8, characterized in that: The first boiler is provided with a steam generator, and the second boiler is provided with a steam superheater; when the first valve is opened, the second valve, the third valve and the regulating valve are closed, the saturated steam separated by the steam-water separator is sent out through the saturated steam outlet; when the first valve is closed, the second valve, the third valve and the regulating valve are opened, the saturated steam separated by the steam-water separator enters the second boiler through the second valve to be heated into superheated steam, and then the superheated steam is sent out through the third valve and the regulating valve to the superheated steam outlet.

10. A saturated dual-purpose steam boiler according to claim 7, characterized in that: The steam trap of the steam trap equipment automatically opens to discharge condensate. The expression is as follows: In the above formula, is the discharge capacity of the steam trap, is the flow coefficient of the steam trap, is the pressure difference between the inlet and outlet of the steam trap, is the density of condensed water, and is the empirical coefficient, is the temperature difference between steam and condensate; is 0.9, is 0.01.

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