A boiler device and an operation method

Abstract

The present invention relates to the technical field of boilers, and specifically discloses a boiler device and an operating method. The boiler device includes a medium supply module, a medium conveying module and a medium processing module connected end to end. The medium conveying module includes a mixed filter forming a filter chamber, a pressure-raising medium supply unit selectively connected to the bottom of the filter chamber, a pump body assembly connected to the top of the filter chamber, and a buffer tank forming a buffer chamber; the filter chamber is filled with liquid, and the medium supply module is connected to the bottom of the filter chamber; the pump body assembly can convey liquid to the medium processing module, including a first feed water pump and a second feed water pump connected in parallel; the buffer chamber is filled with liquid and has the same volume as the two feed water pumps, and the downstream of the two feed water pumps are selectively connected to the top of the buffer chamber respectively, and the liquid in the pump body assembly flows toward the buffer chamber. The structural improvement of the boiler device can realize the regulation of the inlet pressure of the pump in use and the temperature in the standby pump, reducing the risk of damage to the boiler feed water pump.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, and particularly to a boiler device and an operation method thereof. Background Art

[0002] In the WSA wet sulfuric acid production system, the content of the stripped acid gas (H2S) is about 60%. The process gas after combustion pyrolysis in the incinerator and cooled by the waste heat boiler enters the SCR reactor, the SO2 converter, and the WSA condenser in sequence to produce 98% concentrated sulfuric acid. The boiler feed pump is used to provide a cooling water source to cool the process gas at 950 - 1100 °C after the incinerator to 385 - 405 °C. The process gas at 380 - 420 °C after passing through the second layer of SO2 conversion catalyst is cooled to 270 - 290 °C by the process gas cooler and then enters the WSA condenser to produce 98% concentrated sulfuric acid. The cost price of a single boiler feed pump is about 1 million yuan, which is an important operating equipment with relatively high cost.

[0003] As Figure 1 shown, in the prior art, the circulation of boiler water relies on a multi-stage centrifugal pump to supply kinetic energy. The multi-stage centrifugal pump is simply referred to as a boiler feed pump. The demineralized water introduced by the demineralized water supply unit 101' enters the deaerator, and after being heated and deaerated by the steam supplied by the steam supply unit 102', it enters the deaeration tank 100'. The water temperature in the deaeration tank 100' is maintained at 100 - 104 °C, and then it flows by gravity to the inlet of the boiler feed pump. The inlet pressure is controlled between 0.1 - 0.2 MPa, and the inlet pressure is stable at 0.12 MPa during normal operation. The boiler feed pump is sent to the steam drum 500' after being pressurized by multiple impellers. An optionally open and close steam drum make-up water valve 510' is provided upstream of the steam drum 500'. The outlet pressure of the steam drum 500' is controlled between 6 - 8 MPa, and the heat exchange water is sent to heat exchange equipment such as the waste heat boiler 610', the blowdown device 620', and the process gas cooler 630' through the steam drum 500' in sequence.

[0004] Currently, the boiler feed pump operates in an interlocked automatic control state under normal operating conditions, and the distributed control system is put into automatic start-stop logic operation. The existing boiler equipment often adopts a structural design with two boiler feed pumps. The two boiler feed pumps are respectively in the first pump group and the second pump group in parallel. The first pump group includes the first feed pump 210', the first inlet valve 220' located upstream of it, and the first outlet valve 230' located downstream of it. The second pump group includes the second feed pump 310', the second inlet valve 320' located upstream of it, and the second outlet valve 330' located downstream of it.

[0005] When the boiler equipment is in operation, one boiler feed pump is the in-use pump and the other is the standby pump. The inlet pressure of the boiler feed pump is susceptible to fluctuations in the liquid level and temperature of the deaerator 100', or factors such as impurities in the inlet, resulting in a gradual decrease in the inlet pressure. The operator judges the interlock start-stop conditions by monitoring the inlet pressure. When it is detected that the inlet pressure is lower than 0.08 MPa, the system will automatically start the standby pump and stop the in-use pump. When the inlet pressure of the started standby boiler feed pump is monitored to be less than 0.08 MPa again, the in-use pump and the standby pump are switched again, and so on in a cycle. The inlet and outlet of the boiler feed pump are in a normally open state, and the outlet valve is controlled by a check valve.

[0006] However, when the existing boiler equipment is in operation, the following problems still exist:

[0007] 1) During the period of switching the in-use pump and the standby pump, multiple start-stop pump operations will occur, which easily leads to the mechanical part of the feed pump being stuck and burned out or the impeller being worn;

[0008] 2) It is easy to cause the boiler water circulation system to lack water, resulting in dry burning of the boiler. After the boiler lacks water, instantaneous water inlet will cause a boiler explosion accident;

[0009] 3) After the boiler equipment fails, the environmental protection accident induced by the forced shutdown of the system caused by the loss of heat exchange function of the hot water circulation system;

[0010] 4) When the standby pump is in a cold state during long-term shutdown, the medium temperature of the cold-state medium in the pump body is close to the ambient temperature, while the temperature of the deaerated water in the deaerator is between 100-104 °C. When the standby pump is started due to interlock, a large amount of high-temperature deaerated water entering the pump body is likely to cause mechanical components to be damaged by heat accumulation and cavitation, resulting in insufficient flow or cavitation damage to the impeller;

[0011] 5) When the standby pump is in long-term shutdown, there is gas between the impellers in the pump, and the gas entrained in the medium cannot be discharged in time and effectively, which easily causes insufficient flow after the pump is started, resulting in insufficient water circulation volume. Summary of the Invention

[0012] The purpose of the present invention is to provide a boiler equipment and an operation method to stabilize the inlet pressure of the boiler feed pump.

[0013] To achieve this purpose, the present invention adopts the following technical solutions:

[0014] A boiler device includes a medium supply module, a medium delivery module, and a medium treatment module connected end to end. The medium delivery module includes a mixing filter, a pressure boosting medium supply unit, a pump body assembly, and a buffer tank. The mixing filter forms a filtration chamber filled with liquid. The medium supply module is connected to the bottom of the filtration chamber for delivering a first medium into the filtration chamber. The pressure boosting medium supply unit is selectively connected to the bottom of the filtration chamber and can deliver a second medium into the filtration chamber. The pump body assembly is connected to the top of the filtration chamber and can deliver liquid to the medium treatment module, including a pressure detection unit and a first feed water pump and a second feed water pump connected in parallel. The pressure detection unit is used to detect the inlet pressure of the first feed water pump and the second feed water pump. The buffer tank forms a buffer chamber with the same volume as the first feed water pump and the second feed water pump. The buffer chamber is filled with liquid. The downstream of the first feed water pump and the second feed water pump are selectively connected to the top of the buffer chamber respectively. The liquid in the pump body assembly flows towards the buffer chamber. A temperature detection unit is provided in the buffer chamber for detecting the temperature in the buffer chamber.

[0015] As a preferred technical solution of the boiler device, a filter screen is provided in the filtration chamber for filtering the liquid in the filtration chamber. The filter screen divides the filtration chamber vertically into an upper chamber and a lower chamber. The upper chamber is connected to the pump body assembly, and the lower chamber is simultaneously connected to the medium supply module and the pressure boosting medium supply unit.

[0016] As a preferred technical solution of the boiler device, the pressure boosting medium supply unit is selectively connected to the lower chamber through a supply pipeline, and the pressure boosting medium supply unit is selectively connected to the top of the filtration chamber through a backwashing pipeline. The bottom of the filtration chamber can selectively discharge liquid.

[0017] As a preferred technical solution of the boiler device, a filter inlet valve for controlling the on / off of the medium supply module and the mixing filter is provided upstream of the mixing filter. The medium delivery module includes an inlet bypass pipe connected in parallel to the filter inlet valve and the mixing filter. The inlet bypass pipe selectively connects the medium supply module and the pump body assembly.

[0018] As a preferred technical solution of the boiler device, the medium delivery module further includes an overflow pipe and a collection pool. The buffer chamber discharges liquid to the collection pool through the overflow pipe.

[0019] As a preferred technical solution of the boiler device, the filtration chamber discharges liquid to the collection pool.

[0020] As a preferred technical solution of the boiler equipment, the filter screen is embedded on the inner side wall of the buffer tank.

[0021] As a preferred technical solution of the boiler equipment, the temperature of the second medium in the pressure boosting medium supply unit is within the medium temperature threshold.

[0022] A method for operating a boiler equipment, applied to the above-mentioned boiler equipment, includes the following steps:

[0023] S10: Use one of the first feed pump and the second feed pump as the in-use pump, and the other as the standby pump. The in-use pump operates to convey liquid to the medium treatment module, and the standby pump is shut down and regarded as a passage pipeline. The medium supply module conveys the first medium to the mixing filter.

[0024] S20: Use the pressure detection unit to measure the inlet pressure of the in-use pump.

[0025] S30: Determine whether the inlet pressure of the in-use pump is higher than the first pressure threshold. If so, proceed to step S70; if not, proceed to step S40.

[0026] S40: The pressure boosting medium supply unit conveys the second medium to the mixing filter.

[0027] S50: Use the pressure detection unit to measure the inlet pressure of the in-use pump.

[0028] S60: Determine whether the inlet pressure of the in-use pump continuously remains higher than the second pressure threshold within the liquid pressurization time. If so, stop conveying the second medium to the mixing filter and proceed to step S70; if not, return to step S50.

[0029] S70: Use the temperature detection unit to measure the temperature in the buffer chamber.

[0030] S80: Determine whether the temperature in the buffer chamber is higher than the first temperature threshold. If so, return to step S20; if not, proceed to step S90.

[0031] S90: Replace the liquid in the buffer chamber until the temperature in the buffer chamber is higher than the second temperature threshold, and then return to step S20.

[0032] As a preferred technical solution of the method for operating a boiler equipment, the step S90 includes the following detailed steps:

[0033] S91: Connect the standby pump and the buffer chamber to enable the liquid downstream of the standby pump to start replacing the liquid in the buffer chamber.

[0034] S92: Measuring the temperature in the buffer cavity using the temperature detection unit;

[0035] S93: Determine whether the temperature in the buffer chamber is higher than a second temperature threshold. If so, disconnect the backup pump and the buffer chamber and return to step S20. If not, return to step S92.

[0036] Beneficial effects of the present invention:

[0037] The pump assembly of the boiler equipment includes a first feed water pump and a second feed water pump connected in parallel, which provides a pump in use and a standby pump for the boiler equipment. By alternating the two pumps, the risk of the boiler equipment being shut down due to damage to the boiler feed water pump is greatly reduced, thereby effectively improving the work efficiency. With the design of the mixed filter, the liquid is transported to the pump assembly after overflowing the filter chamber, so as to achieve the rapid discharge of bubbles in the mixed filter; at the same time, the existence of the mixed filter is conducive to the full mixing of the first medium transported by the medium supply module and the second medium transported by the pressure-raising medium supply unit in the filter chamber, prolonging the medium contact heat exchange time and making the temperature of the mixed medium uniform. By inputting a large amount of the second medium into the filter chamber, the liquid pressure in the filter chamber can be adjusted, thereby achieving the stabilization of the inlet pressure of the in-use pump, eliminating the frequent interlocking start and stop of the equipment due to the inlet pressure being lower than the interlocking start and stop value, thereby greatly reducing the risk of burning and jamming of the boiler equipment. By virtue of the design that the buffer chamber has the same volume as the first water feed pump and the second water feed pump, it is possible to determine whether the internal liquid temperature of the standby pump is too low by measuring the temperature of the liquid in the buffer chamber. The liquid in the standby pump can be replenished from the mixing filter by replacing the liquid in the buffer chamber, thereby increasing the temperature of the liquid in the standby pump, so that the standby pump is converted from a long-term cold state to a hot standby state, reducing the risk of heat accumulation in the standby pump in the cold state and damaging other components, suppressing the risk of mechanical failure and safety and environmental accidents, stabilizing the performance of the standby pump, extending the service life of the boiler feed pump, and ensuring the safe and smooth operation of the boiler equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural diagram of the existing boiler equipment;

[0039] Figure 2 It is a structural schematic diagram of a boiler device provided in an embodiment of the present invention.

[0040] Figure 1 middle:

[0041] 100’, deaeration tank; 101’, demineralized water supply unit; 102’, steam supply unit; 210’, first feed water pump; 220’, first inlet valve; 230’, first outlet valve; 310’, second feed water pump; 320’, second inlet valve; 330’, second outlet valve; 500’, steam drum; 510’, steam drum make-up water valve; 610’, waste heat boiler; 620’, blowdown device; 630’, process gas cooler.

[0042] Figure 2 Among them:

[0043] 100, deaeration tank; 101, demineralized water supply unit; 102, steam supply unit; 210, first feed water pump; 220, first inlet valve; 230, first outlet valve; 240, first outlet drain valve; 310, second feed water pump; 320, second inlet valve; 330, second outlet valve; 340, second outlet drain valve; 410, buffer tank; 411, temperature sensor; 420, inlet pipe; 430, overflow pipe; 440, collection pool; 500, steam drum; 510, steam drum make-up water valve; 610, waste heat boiler; 620, blowdown device; 630, process gas cooler; 700, inlet bypass pipe; 701, inlet bypass valve; 810, mixing filter; 811, filter screen; 820, filter inlet valve; 830, filter outlet valve; 840, filter drain valve; 910, boosting medium supply unit; 920, inlet main pipe make-up water valve; 930, backwash valve. Detailed implementation manners

[0044] To make the technical problems solved by the present invention, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0045] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. 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.

[0046] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0047] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0048] As Figure 2 shown, this embodiment provides a boiler device, including a medium supply module, a medium delivery module and a medium processing module connected end to end. The medium delivery module includes a mixing filter 810, a pressure-boosting medium supply unit 910, a pump body assembly and a buffer tank 410; the mixing filter 810 forms a filtration chamber filled with liquid, the medium supply module is connected to the bottom of the filtration chamber for delivering a first medium into the filtration chamber; the pressure-boosting medium supply unit 910 is selectively connected to the bottom of the filtration chamber and can deliver a second medium into the filtration chamber; the pump body assembly is connected to the top of the filtration chamber, and the pump body assembly can deliver liquid to the medium processing module, including a pressure detection unit and a first feed water pump 210 and a second feed water pump 310 connected in parallel. The pressure detection unit is used to detect the inlet pressure of the first feed water pump 210 and the inlet pressure of the second feed water pump 310; the buffer tank 410 forms a buffer chamber with the same volume as the first feed water pump 210 and the second feed water pump 310. The buffer chamber is filled with liquid. The downstream of the first feed water pump 210 and the second feed water pump 310 are selectively connected to the top of the buffer chamber respectively, and the liquid in the pump body assembly flows towards the buffer chamber. A temperature detection unit is provided in the buffer chamber, and the temperature detection unit is used to detect the temperature in the buffer chamber.

[0049] The pump body assembly of this boiler equipment includes a design in which the first feed water pump 210 and the second feed water pump 310 are connected in parallel, providing a working pump and a standby pump for the boiler equipment. By means of the alternating operation of the two pumps, the risk of the boiler equipment shutting down due to damage to the boiler feed water pump is significantly reduced, thereby effectively improving the working efficiency. With the design of the mixing filter 810, by means of the liquid overflowing the filter cavity and then being transported to the pump body assembly, the rapid discharge of air bubbles in the mixing filter 810 is achieved; at the same time, the presence of the mixing filter 810 is conducive to the full mixing of the first medium transported by the medium supply module and the second medium transported by the pressure boosting medium supply unit 910 in the filter cavity, prolonging the medium contact heat exchange time and making the temperature of the mixed medium uniform. By inputting a large amount of the second medium into the filter cavity, the regulation of the liquid pressure in the filter cavity can be realized, thereby enabling the stabilization of the inlet pressure of the working pump and eliminating the situation of frequent interlocking start and stop of the equipment due to the inlet pressure being lower than the interlocking start and stop value, thus significantly reducing the risk of the boiler equipment burning out and jamming. With the design that the buffer cavity has the same volume as the first feed water pump 210 and the second feed water pump 310, by measuring the liquid temperature in the buffer cavity, it is possible to judge whether the internal liquid temperature of the standby pump is too low. Thus, by replacing the liquid in the buffer cavity, the liquid in the standby pump can be replenished from the mixing filter 810, thereby increasing the temperature of the liquid in the standby pump, converting the standby pump from a long-term cold state to a hot standby state, reducing the situation of other components being damaged by temperature accumulation and heat absorption in the cold state of the standby pump, suppressing the risk of mechanical failures and safety and environmental protection accidents, stabilizing the performance of the standby pump, prolonging the service life of the boiler feed water pump, and ensuring the safe and smooth operation of the boiler equipment.

[0050] Preferably, the buffer tank 410 is connected to the downstream of the first feed water pump 210 and the second feed water pump 310 through the inlet pipe 420. The end of the inlet pipe 420 connected to the downstream of the first feed water pump 210 is higher than the downstream of the first feed water pump 210, and the on-off of the inlet pipe 420 and the downstream of the first feed water pump 210 is controlled by the first outlet drain valve 240; the end of the inlet pipe 420 connected to the downstream of the second feed water pump 310 is higher than the downstream of the second feed water pump 310, and the on-off of the inlet pipe 420 and the downstream of the second feed water pump 310 is controlled by the second outlet drain valve 340. The above design enables the gas in the pump body assembly to be smoothly guided into the buffer cavity, thereby significantly reducing the air bubbles in the boiler feed water pump, avoiding the risk of air binding when the standby pump starts due to the presence of air in the pump impeller, reducing the phenomenon of insufficient flow or cavitation of the pump impeller, and reducing the risk of damage to the boiler feed water pump. Specifically, the temperature detection unit is a temperature sensor 411.

[0051] In this embodiment, the first medium is deaerated water and the second medium is condensate.

[0052] In this embodiment, a filter screen 811 is provided in the filtration chamber. The filter screen 811 is used to filter the liquid in the filtration chamber. The filter screen 811 divides the filtration chamber vertically into an upper chamber and a lower chamber. The upper chamber is communicated with the pump body assembly, and the lower chamber is simultaneously communicated with the medium supply module and the pressure-boosting medium supply unit 910. The setting of the filter screen 811 greatly improves the filtration effect of the mixed filter 810 on impurities in the liquid, reduces the probability of the inlet pressure drop, and reduces the maintenance frequency of the mixed filter 810.

[0053] Furthermore, the pressure-boosting medium supply unit 910 is selectively communicated with the lower chamber through a supply pipeline, and the pressure-boosting medium supply unit 910 is selectively communicated with the top of the filtration chamber through a backwash pipeline. The bottom of the filtration chamber can selectively discharge the liquid. With the above structural arrangement, it is possible to cut off the supply pipeline, the pipeline connecting the medium supply module and the mixed filter 810, and the pipeline connecting the mixed filter 810 and the pump body assembly, and connect the backwash pipeline and the bottom pipeline of the filtration chamber to realize the backwashing operation of the mixed filter 810, thereby completing the process of backwashing and discharging the impurities on the filter screen 811 and the inner side wall of the filtration chamber. The above process is simple and convenient, eliminating the process of disassembling and assembling the mixed filter 810, and greatly improving the cleaning efficiency of the mixed filter 810.

[0054] Still further, an inlet valve 820 for controlling the on-off of the medium supply module and the mixed filter 810 is provided upstream of the mixed filter 810. The medium delivery module includes an inlet bypass pipe 700. The inlet bypass pipe 700 is connected in parallel between the inlet valve 820 and the mixed filter 810. The inlet bypass pipe 700 selectively communicates the medium supply module and the pump body assembly. The above design further improves the working efficiency of the boiler equipment. The arrangement of connecting the inlet bypass pipe 700 in parallel between the inlet valve 820 and the mixed filter 810 enables the boiler equipment not to stop production and wait during the backwashing operation of the mixed filter 810. With the arrangement of the inlet bypass pipe 700, it is possible to skip the mixed filter 810 and continue to operate. The above design greatly improves the working efficiency of the boiler equipment.

[0055] Preferably, an inlet bypass valve 701 for controlling the on-off of the inlet bypass pipe 700 is provided on the inlet bypass pipe 700. A filter outlet valve 830 for controlling the on-off of the mixed filter 810 and the pump body assembly is provided downstream of the mixed filter 810. A filter drain valve 840 is used to control the on-off of the mixed filter 810 and the external environment. A backwash valve 930 for controlling the on-off of the backwash pipeline is provided on the backwash pipeline. An inlet main pipe make-up water valve 920 for controlling the on-off of the supply pipeline is provided on the supply pipeline.

[0056] Specifically, when performing the backwashing operation of the hybrid filter 810, first open the inlet bypass valve 701, then close the filter inlet valve 820 and the filter outlet valve 830, and then open the filter drain valve 840 and the backwash valve 930, and close the makeup water valve 920 of the inlet main pipe to perform the backwashing operation. After the operation of the hybrid filter 810 is completed, first close the filter drain valve 840, then close the backwash valve 930, then open the filter inlet valve 820 and the filter outlet valve 830, and finally close the inlet bypass valve 701 to make the hybrid filter 810 put into use again.

[0057] Preferably, the medium delivery module further includes an overflow pipe 430 and a collection tank 440, and the buffer chamber discharges liquid to the collection tank 440 through the overflow pipe 430. Specifically, the filtration chamber discharges liquid to the collection tank 440. The overflow pipe 430 is used for full-flow overflow to the collection tank 440; the setting of the collection tank 440 realizes the recovery of the mixture of the first medium and the second medium, enabling the above mixture to be applied to other processes of the boiler equipment production line, thereby greatly improving the recovery efficiency of the waste liquid, reducing energy consumption, enhancing economic benefits, and contributing to improving the environmental protection level of the production line.

[0058] In this embodiment, the filter screen 811 is embedded in the inner side wall of the buffer tank 410. Specifically, the filter screen 811 is made of metal. The design of fixing the filter screen 811 to the inner side wall of the buffer tank 410 by embedding is stable and convenient to connect, which helps to improve the efficiency of inspection and maintenance.

[0059] Preferably, the temperature of the second medium in the pressure boosting medium supply unit 910 is within the medium temperature threshold. Specifically, the medium temperature threshold is 80°C - 90°C. By controlling the temperature of the condensate water within a range close to the temperature of the deaerated water, a small amount of condensate water replenishment avoids the sudden change of the inlet liquid temperature of the pump body of the boiler feed pump, ensuring the stability of the pump body temperature of the boiler feed pump.

[0060] Specifically, a first inlet valve 220 is provided at the inlet end of the first feed pump 210, a first outlet valve 230 is provided at the outlet end of the first feed pump 210, a second inlet valve 320 is provided at the inlet end of the second feed pump 310, a second outlet valve 330 is provided at the outlet end of the second feed pump 310, and the first inlet valve 220, the first outlet valve 230, the second inlet valve 320, and the second outlet valve 330 are all one-way valves.

[0061] In this embodiment, the medium supply module includes a deaerator, the deaerator is provided with a deaeration tank 100, the deaeration tank 100 is communicated with a demineralized water supply unit 101 and a steam supply unit 102, and after the demineralized water introduced by the demineralized water supply unit 101 enters the deaerator, it is heated by the steam provided by the steam supply unit 102 and then enters the deaeration tank 100 after deaeration.

[0062] Preferably, the medium processing module includes a steam drum 500. An alternately open-and-close steam drum water replenishing valve 510 is provided upstream of the steam drum 500. The heat exchange water is sequentially sent to heat exchange devices such as a waste heat boiler 610, a blowdown device 620, and a process gas cooler 630 through the steam drum 500.

[0063] In this embodiment, the boiler equipment further includes a distributed control system which is conveniently communicatively connected to a pressure detection unit and a temperature detection unit. The distributed control system determines whether there is a need for pressure adjustment according to the data measured by the pressure detection unit. If so, it controls the boosting medium supply unit 910 to discharge a second medium into the mixing filter 810 to adjust the inlet pressure of the in-use pump. The distributed control system determines whether there is a need for temperature adjustment according to the data measured by the temperature detection unit. If so, it controls the buffer tank 410 to displace the liquid in the standby valve to adjust the temperature of the liquid in the standby pump.

[0064] This embodiment also provides a method for operating a boiler equipment, which is applied to the above-mentioned boiler equipment and includes the following steps:

[0065] Step 1: Use one of the first feed pump 210 and the second feed pump 310 as the in-use pump and the other as the standby pump. The in-use pump operates to deliver the liquid to the medium processing module, and the standby pump stops operating and is regarded as a passage pipeline. The medium supply module delivers a first medium to the mixing filter 810.

[0066] Step 2: Measure the inlet pressure of the in-use pump by using the pressure detection unit.

[0067] Step 3: Determine whether the inlet pressure of the in-use pump is higher than a first pressure threshold. If so, go to Step 7; if not, go to Step 4.

[0068] Step 4: The boosting medium supply unit 910 delivers a second medium to the mixing filter 810.

[0069] Step 5: Measure the inlet pressure of the in-use pump by using the pressure detection unit.

[0070] Step 6: Determine whether the inlet pressure of the in-use pump continuously remains higher than a second pressure threshold within the liquid pressurization time. If so, stop delivering the second medium to the mixing filter 810 and go to Step 7; if not, return to Step 5.

[0071] Step 7: Measure the temperature in the buffer chamber by using the temperature detection unit.

[0072] Step 8: Determine whether the temperature in the buffer chamber is higher than a first temperature threshold. If so, return to Step 2; if not, go to Step 9.

[0073] Step Nine: Replace the liquid in the buffer chamber until the temperature in the buffer chamber is higher than the second temperature threshold, and then return to Step Two.

[0074] Specifically, the first pressure threshold is 0.10 MPa, the second pressure threshold is 0.15 MPa, and the liquid pressurization time is 30 minutes; the first temperature threshold is 60 °C, and the second temperature threshold is 90 °C.

[0075] The operation process of this boiler equipment operation method is simple and reliable, which can ensure the smooth and efficient completion of the pressure regulation operation of the inlet pressure of the in-use pump and the temperature regulation operation of the liquid in the standby pump, realize the accurate monitoring of the inlet pressure of the in-use pump and the temperature of the liquid in the standby pump, ensure the stable operation of the boiler equipment, and reduce the maintenance frequency of the boiler feed pump.

[0076] Further, Step Nine includes the following detailed steps: Connect the standby pump and the buffer chamber to enable the liquid downstream of the standby pump to start replacing the liquid in the buffer chamber; Use the temperature detection unit to measure the temperature in the buffer chamber; Determine whether the temperature in the buffer chamber is higher than the second temperature threshold. If so, disconnect the standby pump and the buffer chamber and return to Step Two. If not, return to the step of using the temperature detection unit to measure the temperature in the buffer chamber. The above process is simple and reliable, which can further ensure the smooth and efficient completion of the temperature regulation operation of the liquid in the standby pump.

[0077] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A boiler device, characterized in that, It includes a medium supply module, a medium conveying module, and a medium processing module connected end to end. The medium conveying module includes: A mixing filter (810) forms a filtering chamber filled with liquid. The medium supply module is connected to the bottom of the filtering chamber for conveying a first medium into the filtering chamber. A pressure-boosting medium supply unit (910) is selectively connected to the bottom of the filtering chamber and can convey a second medium into the filtering chamber. A pump body assembly is connected to the top of the filtering chamber. The pump body assembly can convey liquid to the medium processing module and includes a pressure detection unit, a first feed pump (210), and a second feed pump (310) connected in parallel. The pressure detection unit is used to detect the inlet pressure of the first feed pump (210) and the inlet pressure of the second feed pump (310). A buffer tank (410) forms a buffer chamber with the same volume as the first feed pump (210) and the second feed pump (310). The buffer chamber is filled with liquid. The downstream of the first feed pump (210) and the second feed pump (310) are selectively connected to the top of the buffer chamber respectively. The liquid in the pump body assembly flows towards the buffer chamber. A temperature detection unit is provided in the buffer chamber for detecting the temperature in the buffer chamber.

2. The boiler equipment according to claim 1, characterized in that, A filter screen (811) is provided in the filtering chamber for filtering the liquid in the filtering chamber. The filter screen (811) divides the filtering chamber vertically into an upper chamber and a lower chamber. The upper chamber is connected to the pump body assembly, and the lower chamber is simultaneously connected to the medium supply module and the pressure-boosting medium supply unit (910).

3. The boiler equipment according to claim 2, characterized in that, The pressure-boosting medium supply unit (910) is selectively connected to the lower chamber through a supply pipeline and selectively connected to the top of the filtering chamber through a backwashing pipeline. The bottom of the filtering chamber can selectively discharge liquid.

4. The boiler equipment according to claim 3, characterized in that, An inlet valve of the filter (820) for controlling the on / off between the medium supply module and the mixing filter (810) is provided upstream of the mixing filter (810). The medium conveying module includes an inlet bypass pipe (700) connected in parallel to the inlet valve of the filter (820) and the mixing filter (810). The inlet bypass pipe (700) is selectively connected to the medium supply module and the pump body assembly.

5. The boiler equipment according to claim 4, characterized in that, The medium conveying module further includes an overflow pipe (430) and a collection tank (440). The buffer chamber discharges liquid to the collection tank (440) through the overflow pipe (430).

6. The boiler equipment according to claim 5, characterized in that, The filtering chamber discharges liquid to the collection tank (440).

7. The boiler equipment according to claim 2, characterized in that, The filter screen (811) is embedded in the inner side wall of the buffer tank (410).

8. The boiler equipment according to any one of claims 1-7, characterized in that, The temperature of the second medium in the pressure-boosting medium supply unit (910) is within the medium temperature threshold.

9. A method for operating a boiler device, characterized in that, Applied to the boiler equipment according to any one of claims 1-8, it includes the following steps: S10: Use one of the first feed pump (210) and the second feed pump (310) as the in-use pump and the other as the standby pump. The in-use pump operates to deliver liquid to the medium treatment module, and the standby pump is shut down and regarded as a passage pipeline. The medium supply module delivers the first medium to the mixing filter (810). S20: Use the pressure detection unit to measure the inlet pressure of the in-use pump. S30: Determine whether the inlet pressure of the in-use pump is higher than the first pressure threshold. If so, proceed to step S70; if not, proceed to step S40. S40: The pressure boosting medium supply unit (910) delivers the second medium to the mixing filter (810). S50: Use the pressure detection unit to measure the inlet pressure of the in-use pump. S60: Determine whether the inlet pressure of the in-use pump continuously remains higher than the second pressure threshold within the liquid pressurization time. If so, stop delivering the second medium to the mixing filter (810) and proceed to step S70; if not, return to step S50. S70: Use the temperature detection unit to measure the temperature in the buffer chamber. S80: Determine whether the temperature in the buffer chamber is higher than the first temperature threshold. If so, return to step S20; if not, proceed to step S90. S90: Replace the liquid in the buffer chamber until the temperature in the buffer chamber is higher than the second temperature threshold, and then return to step S20.

10. The method for operating a boiler device according to claim 9, characterized in that, Step S90 includes the following detailed steps: S91: Connect the standby pump and the buffer chamber to enable the liquid downstream of the standby pump to start replacing the liquid in the buffer chamber. S92: Use the temperature detection unit to measure the temperature in the buffer chamber. S93: Determine whether the temperature in the buffer chamber is higher than the second temperature threshold. If so, disconnect the standby pump and the buffer chamber and return to step S20; if not, return to step S92.

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