A thermal system for sludge incineration

Abstract

The present invention discloses a thermal system for sludge incineration, belonging to the technical field of sludge incineration, and relating to the optimization and transformation of the thermal system and stable production. The system includes a deaerator, a condensate tank and a steam header, and further includes a water seal device. A water seal chamber is provided in the water seal device. The water seal chamber is communicated with the steam exhaust pipe of the deaerator, and the water seal chamber is further connected with a steam vent pipe and a make-up water pipe. A regulating valve is provided on the steam vent pipe. The water seal device further includes a soft water tank. Soft water is filled into the water seal chamber through the make-up water pipe, and the soft water in the water seal chamber is communicated with the soft water in the soft water tank through a balance pipeline, so as to greatly increase the stability of the system, so that the continuous production capacity is greatly improved, and the purpose of increasing production and efficiency is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of sludge incineration, and relates to optimization and transformation of a thermal system and stable production, and specifically to a thermal system for sludge incineration. Background Art

[0002] In the existing thermal system, the deaerator uses steam for thermal deoxidation and is the core equipment of the whole plant. Once a failure occurs, the water quality will exceed the standard, causing great safety hazards to the thermal system equipment and pipelines. The deaerator of our plant is an atmospheric deaerator. The following two faults occurred in the early stage of commissioning:

[0003] A. Oxygen corrosion problem: The deaerator operating parameters cannot be maintained at the rated operating conditions (20KPa, 104°C), and the deoxygenation effect cannot be achieved, resulting in oxygen corrosion of thermal system equipment and pipelines;

[0004] B. Supporting design issues: The supporting facilities of the deaerator do not meet the actual operating conditions, failures occur frequently, and frequent shutdowns are required, making it impossible for the entire plant to maintain continuous safe production.

[0005] The main function of the feed pump in the thermal system is to transport the water from the condensate tank to the boiler for use. This equipment is the core equipment of our factory. Once a failure occurs, it will cause the entire factory to stop production and cause a major safety hazard to the boiler. The current problem is that since the original design of the feed pump is only about 1 meter away from the water surface of the condensate tank, the feed pump frequently suffers from cavitation failure during commissioning and operation, resulting in water shortage in the boiler and causing the entire factory to stop production.

[0006] In the thermal system, the air cooler is an important equipment for water resource recycling. If the return water of the air cooler can be directly transported to the condensate tank, the deaerator will be greatly reduced, the number of failure points will be reduced, and the production will be stable. The current problems are: due to the large amount of return water from the air cooler, if the return water is sent to the soft water tank, the condensate tank will need to be frequently replenished, which will increase the equipment operation time and consume more energy; if the return water is sent to the condensate tank, because the outlet pressure of the air cooler is lower than that of the condensate tank, the return water will cause a large vibration in the condensate tank, which may crack the pipeline. Summary of the invention

[0007] In view of this, in order to solve the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a thermal system for sludge incineration to greatly increase the stability of the system, so that the continuous production capacity is greatly improved, thereby achieving the purpose of increasing production and efficiency.

[0008] The technical solution adopted by the present invention is as follows: A thermal system for sludge incineration includes a deaerator, a condensate tank, and a steam header, and further includes a water seal device. A water seal chamber is provided in the water seal device. The water seal chamber is communicated with the steam exhaust pipe of the deaerator, and the water seal chamber is also connected with a steam evacuation pipe and a makeup water pipe. A regulating valve is provided on the steam evacuation pipe; The water seal device further includes a soft water tank. Soft water is filled into the water seal chamber through the makeup water pipe, and the soft water in the water seal chamber is communicated with the soft water in the soft water tank through a balance pipeline.

[0009] Further, the liquid level height difference between the soft water in the water seal chamber and the soft water in the soft water tank is greater than or equal to 2 meters, so as to stabilize the pressure of the deaerator at 20 KPa.

[0010] Further, the balance pipeline is arranged as a U-shaped pipe, and both ends of the U-shaped pipe extend into the soft water in the water seal chamber and the soft water tank respectively. By adding water to the soft water tank, the pressure at the outlet of the U-shaped pipe is made greater than the steam pressure.

[0011] Further, the outlet of the deaerator is connected with a DN65 pipeline. Multiple makeup water pipelines are connected in parallel on the DN65 pipeline. A feed water pump is provided on each makeup water pipeline, and the other ends of each makeup water pipeline are connected to the condensate tank, avoiding the cavitation critical point when the feed water pump is running.

[0012] Further, each of the feed water pumps is arranged at a lower position relative to the liquid level of the condensate tank to increase the static pressure at the inlet of the pump body and avoid the cavitation working condition point.

[0013] Further, the deaerator is communicated with the condensate tank and the steam header through a first steam pipe and a second steam pipe respectively. A steam source switching valve group is provided between the first steam pipe and the second steam pipe to switch the first steam pipe and the second steam pipe to be simultaneously supplied with steam by the steam header, or the first steam pipe and the second steam pipe are respectively supplied with steam by the condensate tank and the steam header, so as to prevent the soft water in the deaerator from being insufficiently heated and the temperature fluctuating greatly due to the low and unstable steam quality of the condensate tank, affecting the deaeration effect.

[0014] Further, the steam source switching valve group includes a first valve and a third valve respectively arranged on the first steam pipe and the second steam pipe. A first steam branch and a second steam branch are respectively arranged on one side of the inlet and outlet of the first valve. The other ends of the first steam branch and the second steam branch are connected to one side of the inlet of the third valve, and a fourth valve and a second valve are respectively arranged on the first steam branch and the second steam branch to realize the on-demand switching of the steam supply pipeline.

[0015] Furthermore, the steam header is connected to an air condenser. The air condenser is connected to a condensate tank through a return water pipeline, and a power drain pump device is provided on the return water pipeline. After the return water is pressurized by the power drain pump device, it flows back to the condensate tank. The surplus steam in the steam header can activate the power drain pump device, enabling the return water from the air cooler to flow back to the condensate tank, which can better achieve the energy-saving effect.

[0016] Furthermore, the power drain pump device includes a water storage tank and a drain pump. The steam inlet of the drain pump is communicated with the steam header. The top of the water storage tank is communicated with the air condenser through a return water pipeline. The bottom of the water storage tank is communicated with the water inlet of the drain pump. The water outlet of the drain pump is communicated with the condensate tank through a return water pipeline. The internal energy of the return water from the air condenser is converted into kinetic energy by the drain pump to achieve pressurization of the return water to adapt to the pressure of the condensate tank.

[0017] Furthermore, a flexible connection is adopted between the condensate tank and the return water pipeline to eliminate the lateral expansion stress of the thermal pipeline.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. By adopting the thermal system for sludge incineration provided by the present invention and transforming the water seal device, the pressure of the deaerator is ensured to be stable at 20 KPa, and the temperature is also stabilized at 104 °C accordingly, realizing the stable operation of the deaerator without cavitation and oxygen corrosion.

[0020] 2. By adopting the thermal system for sludge incineration provided by the present invention and reasonably designing the layout of the feed pump, the inlet static pressure of the feed pump is increased. At the same time, the diameter of the inlet pipe of the feed pump is increased and the valves are optimized and reduced to reduce the pipeline loss, reducing the failure rate of the feed pump, avoiding the cavitation failure of the feed pump during operation, greatly increasing the system stability, and significantly improving the continuous production capacity, achieving the purpose of increasing production and efficiency.

[0021] 3. By adopting the thermal system for sludge incineration provided by the present invention, the return water in the return water pipeline is pressurized by a power drain pump and directly enters the condensate tank, relieving the replenishment pressure of the condensate tank, achieving the purpose of energy conservation and consumption reduction. At the same time, the stability and reliability of equipment operation are also improved, realizing the increase of production and efficiency. Description of the Drawings

[0022] Figure 1 is the overall schematic diagram of the thermal system in sludge incineration;

[0023] Figure 2 is the schematic diagram of the water seal device in the thermal system for sludge incineration provided by the present invention;

[0024] Figure 3It is the connection schematic diagram of the steam source switching valve group in the thermal system for sludge incineration provided by the present invention;

[0025] Figure 4 It is the connection schematic diagram of the feed water pump at the outlet of the deaerator in the thermal system for sludge incineration provided by the present invention;

[0026] Figure 5 It is the connection schematic diagram of the dynamic drain pump device in the thermal system for sludge incineration provided by the present invention;

[0027] Figure 6 It is the internal original path structure diagram of the dynamic drain pump device in the thermal system for sludge incineration provided by the present invention;

[0028] The markings in the attached drawings are as follows:

[0029] 1 - water seal chamber, 2 - balance pipeline, 3 - soft water tank, 4 - steam exhaust pipe, 5 - make-up water pipe, 6 - steam discharge pipe, 7 - deaerator, 8 - condensate tank, 9 - steam header, 10 - feed water pump, 11 - air condenser, 12 - dynamic drain pump device, 13 - water storage tank, 14 - drain pump, 15 - steam source switching valve group, F1 - first valve, F2 - second valve, F3 - third valve, F4 - fourth valve. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0033] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0034] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the inventive product is customarily placed during use. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0035] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set" and "connect" 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 direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances; the accompanying drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] In sludge incineration, a thermal system needs to be used. As an existing mature system, the thermal system, as Figure 1 shown, its working principle is as follows: it includes a deaerator, a condensate tank, a waste heat boiler, a steam header, an air condenser, a gas boiler, and a dryer. During operation, soft water enters the deaerator, and the condensate tank and the steam header provide steam for the deaerator to ensure the normal operation of the deaerator. The deaerator discharges water into the condensate tank, and the condensate tank supplies water to the waste heat boiler and the gas boiler respectively. The steam generated by the waste heat boiler and the gas boiler is input into the steam header. The steam header provides steam for the dryer to realize the normal operation of the dryer. At the same time, the surplus steam generated by the steam header enters the air condenser, and the air condenser returns water to the condensate tank. Through the above thermal system, the effective utilization of heat is achieved.

[0037] Embodiment 1

[0038] In this embodiment, a thermal system for sludge incineration is provided to transform the operation of the deaerator 7 in the thermal system. On the one hand, for the transformation of the oxygen corrosion problem, to avoid oxygen corrosion, the deaerator 7 must operate under the design conditions. The two design condition parameters of pressure and temperature of the deaerator 7 are a pair of related data, that is, if the pressure cannot reach 20 KPa, the temperature will surely not reach 104 °C. Therefore, as long as the pressure problem is solved, this problem can be completely solved.

[0039] To ensure that the pressure of the deaerator 7 is stabilized at 20 kPa and the temperature is also stabilized at 104 °C accordingly, as Figure 2 shown, the following solution is adopted: including a water seal device, in which a water seal chamber 1 is provided. The water seal chamber 1 is a T-shaped cavity and is connected to the steam exhaust pipe 6 of the deaerator 7. The steam of the deaerator 7 is introduced into the water seal device through the steam exhaust pipe 6 to make the pressure of the water seal device consistent with that of the deaerator 7, and this part of the steam exists in the upper part of the water seal device. A steam exhaust pipe 4 and a make-up water pipe 5 are also connected to the water seal chamber 1. The steam exhaust pipe 4 is used to discharge the steam into the atmosphere, and a regulating valve is provided on the steam exhaust pipe 4. The make-up water pipe 5 is used to input soft water into the water seal chamber 1, and the soft water is located in the lower part of the water seal chamber 1. The water seal device further includes a soft water tank 3. Soft water is filled into the water seal chamber 1 through the make-up water pipe 5, and the soft water in the water seal chamber 1 is connected to the soft water in the soft water tank 3 through a balance pipeline 2. At this time, the steam in the water seal chamber 1 contacts the water surface of the soft water. If the outlet of the balance pipeline 2 is in a pressureless state and the steam pressure is high, the steam will leak through the outlet and the water seal pressure cannot be kept stable. Then, water needs to be added to the soft water tank 3 to make the pressure at the outlet greater than the steam pressure. According to the fact that a pressure of 20 kPa is approximately equal to a water column of 2 meters, the liquid level height difference between the soft water in the water seal chamber 1 and the soft water in the soft water tank 3 is about 2 meters. In this embodiment, the balance pipeline 2 is set as a U-shaped pipe, and both ends of the U-shaped pipe extend into the soft water in the water seal chamber 1 and the soft water tank 3 respectively, and it is necessary to ensure that the height difference between the soft water in the soft water tank 3 and the water surface in the water seal chamber 1 is greater than or equal to 2 meters.

[0040] Since a regulating valve is provided on the steam exhaust pipe 4, compared with the situation where there is no control valve on the steam exhaust pipe 4 and it directly leads to the atmosphere, which will cause pressure relief of the deaerator 7, a regulating valve is added to the steam exhaust pipe 4 to control the steam discharge amount and stabilize the pressure of the deaerator 7.

[0041] The operation of the deaerator 7 in the thermal system is transformed. On the other hand, the design problem supporting the deaerator 7 is transformed. The deaerator 7 uses steam as the steam source to heat the soft water to achieve the effect of thermal deaeration. The original deaerator 7 uses the flash steam of the condensate tank as the primary steam source to heat the soft water, but the steam quality of the condensate tank 8 is low (low pressure and low temperature) and unstable, resulting in insufficient heating of the soft water in the deaerator 7 and large fluctuations in temperature, affecting the deaeration effect.

[0042] The working principle of the deaerator 7 requires two groups of steam sources for deaeration. During the engineering construction, the two selected steam sources are the steam header 9 and the condensate tank 8. However, in the actual working state, the steam quality of the condensate tank 8 is poor and sometimes available and sometimes not. Therefore, a steam source switching valve group 15 for the deaerator 7 is designed to achieve the purpose of freely selecting the steam source, and thus can adapt to different working conditions, such as Figure 3As shown in the figure, the adopted solution is as follows:

[0043] The deaerator 7 is connected to the condensate tank 8 and the steam header 9 through the first steam pipe and the second steam pipe respectively. A steam source switching valve group 15 is provided between the first steam pipe and the second steam pipe to switch the first steam pipe and the second steam pipe to be supplied with steam from the steam header 9 at the same time, and the saturated steam of about 1.0 Mpa from the steam header 9 is used as the primary heating steam source, with good effect and stable operation. Or the first steam pipe and the second steam pipe are respectively supplied with steam from the condensate tank 8 and the steam header 9, and the original steam source inlet mode is reserved for standby to meet the needs of different working conditions.

[0044] The steam source switching valve group 15 includes a first valve F1 and a third valve F3 respectively arranged on the first steam pipe and the second steam pipe. The first steam branch and the second steam branch are respectively arranged on one side of the inlet and outlet of the first valve F1. The other ends of the first steam branch and the second steam branch are connected to the side where the inlet of the third valve F3 is located, and a fourth valve and a second valve F2 are respectively arranged on the first steam branch and the second steam branch. According to Figure 3 As shown in the figure, by closing the first valve F1 and the fourth valve F4 and opening the second valve F2 and the third valve F3, the function of supplying gas to the deaerator 7 by the steam header 9 through two pipelines (the first steam pipe and the second steam pipe) can be realized; by closing the second valve F2 and the fourth valve F4 and opening the first valve F1 and the third valve F3, the steam can be supplied to the deaerator 7 from the condensate tank 8 and the steam header 9 through the first steam pipe and the second steam pipe respectively.

[0045] Through the above-mentioned repeated attempts to transform and practice the deaerator, at present, the deaerator and the feed water pump have been continuously and stably operating under the rated working conditions for about one and a half years, and no cavitation and oxygen corrosion phenomena have occurred.

[0046] Embodiment 2

[0047] In the thermal system, the deaerated water is transported from the outlet of the deaerator 7 to the condensate tank 8 through the feed water pump 10. Due to factors such as unreasonable layout and small pipe diameter of the feed water pump 10, when the temperature of the deaerator 7 rises, cavitation occurs in the feed water pump 10, and the deaerated water cannot be transported to the condensate tank 8, resulting in frequent production stoppages due to subsequent inability to replenish water.

[0048] On the basis of Embodiment 1, in order to further transform the operation stability problem of the feed water pump 10 in the thermal system to optimize the thermal system of sludge incineration, as Figure 4 shown, the following technical solution is adopted:

[0049] The outlet of the deaerator 7 is connected to a DN65 pipeline. Five make-up water pipes are connected in parallel to the DN65 pipeline. A feed water pump 10 is provided on each make-up water pipe 5, and the other end of each make-up water pipe 5 is connected to the condensate tank 8. Since the DN65 pipeline is used, the diameter of the inlet water pipe is increased. At the same time, the valves and elbows on the inlet water pipeline are optimized and reduced to avoid the cavitation critical point during the operation of the feed water pump 10, and the risk of cavitation occurring during the operation of the feed water pump 10 is reduced.

[0050] Further analysis shows that the water pump often stops due to cavitation failure, which is caused by insufficient static pressure (water level difference) at the inlet of the water pump. This is due to the unreasonable layout of the position of the existing design feed water pump 10. Therefore, each feed water pump 10 is arranged at a lower position compared to the liquid level of the condensate tank 8, that is, the feed water pump 10 is lowered to a position of -7 meters. The height difference between the feed water pump 10 and the liquid level of the condensate tank 8 is at least 7 meters. At this time, the inlet static pressure of the feed water pump 10 can avoid the cavitation operating point. Through this transformation, the cavitation phenomenon of the feed water pump is completely eliminated, the equipment failure rate is greatly reduced. At the same time, the buffer adjustment ability of the condensate tank is restored, and the stability of the system is greatly increased.

[0051] Embodiment 3

[0052] The condensed water at the outlet of the air condenser 11 is low-temperature water and cannot directly enter the pressurized condensate tank 8. In order to make the air condenser 11 return water to the condensate tank 8 with better energy-saving effect, on the basis of Embodiment 1 or Embodiment 2, in order to further transform the problem of the return water of the air condenser 11 in the thermal system to optimize the thermal system of sludge incineration, such as Figure 5 、 Figure 6 As shown, the following technical solutions are adopted:

[0053] As Figure 5 As shown, the steam header 9 is connected to the air condenser 11. The air condenser 11 is connected to the condensate tank 8 through a return water pipeline, and a power drain pump device 12 is provided on the return water pipeline. After the return water is pressurized by the power drain pump device 12, it flows back to the condensate tank 8. The power drain pump device 12 converts the internal energy of the return water of the air condenser 11 into kinetic energy to achieve return water pressurization to adapt to the pressure of the condensate tank 8. This power drain pump device 12 does not need to use electric energy and only needs to use the surplus steam in the steam header 9 of the thermal system to achieve the action. In this embodiment, a valve Gb is provided on the return water pipeline. The two ends of the valve Gb are connected in parallel with the power drain pump device 12, and the inlet end of the power drain pump device 12 is connected to a valve Gi. The power drain pump device 12 is also connected to a pipeline that provides steam for it, and a valve Vmi is provided on this pipeline. A pressure gauge PI and a temperature gauge TI are also provided on the return water pipeline.

[0054] As Figure 6As shown in the figure, the dynamic drain pump device 12 includes a water storage tank 13 and a drain pump 14. The steam inlet of the drain pump 14 is communicated with the steam header 9 through a pipeline, and a valve Vm is provided on this pipeline. The top of the water storage tank 13 is communicated with the air condenser 11 through a return water pipeline, and a pressure gauge PI and a steam exhaust valve Va are also provided on the top of the water storage tank 13. The bottom of the water storage tank 13 is communicated with the water inlet of the drain pump 14, and a valve Vi and a check valve Ci are sequentially provided on this pipeline. The water outlet of the drain pump 14 is communicated to the condensate tank 8 through a return water pipeline, and a check valve Co and a valve Vo are sequentially provided on this pipeline. A liquid level gauge LI is installed on the water storage tank 13 to measure the liquid level height of the water storage tank 13 in real time. In practical applications, the steam inlet of the drain pump 14 is also connected to the top of the water storage tank 13 through a return steam pipeline, and a valve Ve is provided on this return steam pipeline (the reason for designing the return steam pipeline to the water storage tank 13 is that the excess steam at the steam inlet of the drain pump 14 is easy to hurt people if directly discharged, and it is collected into the upper water storage tank 13 and then discharged to avoid hurting people). A return water pipe is also connected to the water storage tank 13 on the pipeline between the valve Vm and the steam inlet of the drain pump 14, and a valve St is provided on this return water pipe. A flexible connection is adopted between the condensate tank 8 and the return water pipeline to eliminate the lateral expansion stress of the thermal pipeline.

[0055] The working principle of the dynamic drain pump device 12 during operation is as follows:

[0056] The condensate formed by the air condenser 11 enters the water storage tank 13. The water storage tank 13 initially collects the drain water. When the water storage tank 13 reaches a certain capacity, the valve Vi is opened and the water enters the drain pump 14. The valve Vm is opened, and the drain pump 14 operates under the action of the surplus steam to pressurize the drain water and input it into the condensate tank 8 from the water outlet of the drain pump 14. When the drain pump 14 is operating, a return steam pipeline is also externally connected to the steam inlet of the drain pump 14 to return the excess steam to the water storage tank 13 and discharge it to the atmosphere. The condensate formed in the pipeline between the valve Vm and the steam inlet of the drain pump 14 is returned to the water storage tank 13 through the return water pipe.

[0057] Through the transformation of the air condenser, the efficient utilization of the return water of the air condenser and the recovery of energy are realized. The preliminary commissioning has been completed. At the same time, due to the adoption of the flexible connection method, the expansion thermal stress in four directions is eliminated.

[0058] The present invention is not limited to the above optional embodiments. Anyone can obtain other various forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present invention, they all fall within the protection scope of the present invention.

Claims

1. A thermal system for sludge incineration, comprising a deaerator, a condensate tank and a steam header, characterized in that, It also includes a water seal device, which is provided with a water seal chamber. The water seal chamber is communicated with the steam exhaust pipe of the deaerator, and the water seal chamber is also connected with a steam discharge pipe and a makeup water pipe. A regulating valve is provided on the steam discharge pipe; the water seal device also includes a soft water tank. Soft water is filled into the water seal chamber through the makeup water pipe, and the soft water in the water seal chamber is communicated with the soft water in the soft water tank through a balance pipeline; The liquid level height difference between the soft water in the water seal chamber and the soft water in the soft water tank is greater than or equal to 2 meters; The balance pipeline is arranged as a U-shaped pipe, and both ends of the U-shaped pipe extend into the soft water in the water seal chamber and the soft water tank respectively.

2. The thermal system for sludge incineration according to claim 1, wherein The outlet of the deaerator is connected with a DN65 pipeline, and multiple makeup water pipelines are connected in parallel on the DN65 pipeline. Feed pumps are provided on each makeup water pipeline, and the other ends of each makeup water pipeline are connected to the condensate tank.

3. The thermal system for sludge incineration according to claim 2, characterized in that, Each of the feed pumps is arranged at a lower position compared to the liquid level of the condensate tank.

4. The thermal system for sludge incineration according to claim 1, characterized in that, The deaerator is communicated with the condensate tank and the steam header through a first steam pipe and a second steam pipe respectively. A steam source switching valve group is provided between the first steam pipe and the second steam pipe to switch the first steam pipe and the second steam pipe to be supplied with steam by the steam header simultaneously, or the first steam pipe and the second steam pipe are respectively supplied with steam by the condensate tank and the steam header.

5. The thermal system for sludge incineration according to claim 4, wherein The steam source switching valve group includes a first valve and a third valve respectively arranged on the first steam pipe and the second steam pipe. A first steam branch and a second steam branch are respectively arranged on one side where the steam inlet and outlet of the first valve are located. The other ends of the first steam branch and the second steam branch are connected to one side where the steam inlet of the third valve is located, and a fourth valve and a second valve are respectively arranged on the first steam branch and the second steam branch.

6. The thermal system for sludge incineration according to claim 1, characterized in that, The steam header is connected with an air condenser. The air condenser is connected to the condensate tank through a return water pipeline, and a power drain pump device is provided on the return water pipeline. The return water is pressurized by the power drain pump device and then flows back to the condensate tank.

7. The thermal system for sludge incineration according to claim 6, wherein, The power drain pump device includes a water storage tank and a drain pump. The steam inlet of the drain pump is communicated with the steam header. The top of the water storage tank is communicated with the air condenser through a return water pipeline. The bottom of the water storage tank is communicated with the water inlet of the drain pump. The water outlet of the drain pump is communicated with the condensate tank through a return water pipeline.

8. The thermal system for sludge incineration according to claim 6 or 7, characterized in that, A soft connection is adopted between the condensate tank and the return water pipeline.

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