A steam condensate heating control device

Abstract

The present invention discloses a steam condensate heating control device, comprising: a first recovery unit, which is respectively connected to the unit and the boiler pipeline; a second recovery unit, which is respectively connected to the reboiler and the boiler pipeline, and is in parallel with the first recovery unit, and the superheated steam delivered by the boiler heats the condensate from the reboiler to saturated steam; a control unit, which is respectively connected to the first recovery unit and the second recovery unit for control, and is used for receiving the interlock signals of the first recovery unit and the second recovery unit; an adjustment unit, which is used for receiving a control signal and automatically delivering the saturated steam to the boiler. The first recovery unit and the second recovery unit adjust the temperature of the saturated steam output by each of them through interlock actions, and at the same time transmit the detected temperature to the control unit to input an adjustment instruction to the control unit, so that the saturated steam forms superheated steam after being pressurized and heated in the boiler and then is recycled, eliminating the problem that it is difficult to balance the steam consumption and the temperature control of the condensate.

Description

Technical Field

[0001] The present invention relates to the technical field of condensate recovery, and particularly to a steam condensate heating control device. Background Art

[0002] The coal chemical industry is an industry that uses coal as raw material and converts coal into gaseous, liquid, and solid fuels as well as chemical products through chemical processing.

[0003] In the process of producing organic chemical products from coal, a large amount of superheated steam needs to be generated by a boiler as the power source for driving unit equipment to operate. It should be noted that the unit equipment here includes steam turbines, reboilers, etc. During the operation of driving the unit, the heat in the superheated steam decreases, and the steam coming out of the unit equipment is converted into condensate after cooling and heat exchange. The condensate contains a small amount of water and steam. After the condensate is recovered through the condensate pipe network, it is sent into the boiler together, and the condensate is reheated to superheated steam by the boiler to provide the power source for the unit equipment. Usually, in the pipe network for recovering condensate, due to the different heat requirements of the superheated steam needed in each section and each device, the temperatures of the condensate after condensation vary greatly. Then, the temperatures of the condensate in each branch pipe are different. In the branch pipe with a higher temperature, there is more steam and less water, while in the branch pipe with a lower temperature, there is less steam and more water. When the amount of water reaches a certain level, abnormal noises will occur in the pipeline, generating relatively large vibrations. The intuitive phenomenon shown is that the pipeline vibrates. In severe cases, the condensate pipeline located on the pipe gallery undergoes violent oscillations, and even the risk of damaging its own reinforcement device or pipeline cracking may occur. Especially during the startup of the device, the above phenomena are the most frequent and severe. When the pipeline cracks, special shutdown and maintenance are required, resulting in a delay in normal startup and even affecting the production plan. In order to reduce pipeline cracking, the dispatching room adjusts the steam consumption of each section according to the startup situation to reduce it or increases on-site emissions to raise the temperature of the condensate. However, reducing steam consumption will affect the startup or production of this section, and a large amount of condensate discharge will also affect the normal operation of other equipment in this section, and even affect the boiler's recycling of condensate. Therefore, the steam consumption and the temperature control of the condensate have been in a difficult-to-balance contradiction in a short period of time.

[0004] Therefore, the prominent technical problem described above is that it is difficult to balance the steam consumption and the temperature control of the condensate during the startup process of the device. Summary of the Invention

[0005] In order to solve the problem that it is difficult to balance the steam consumption and the temperature control of the condensate during the startup process of the above device, the present invention provides a steam condensate heating control device, which controls the first recovery unit and the second recovery unit to heat the condensate to the saturated steam state through a control unit, and controls the regulating unit to transport the saturated steam to the boiler.

[0006] To achieve the above object, the present invention is realized through the following technical solutions:

[0007] A steam condensate heating control device uses superheated steam to heat the condensate discharged from the unit and the reboiler to saturated steam and transports it to the boiler, including:

[0008] A first recovery unit is respectively connected to the unit and the boiler pipeline, uses the superheated steam transported by the boiler to heat the condensate from the unit to saturated steam, and is used to adjust the temperature of the saturated steam through interlocking actions.

[0009] A second recovery unit is respectively connected to the reboiler and the boiler pipeline, is connected in parallel with the first recovery unit, uses the superheated steam transported by the boiler to heat the condensate from the reboiler to saturated steam, and is used to adjust the temperature of the saturated steam through interlocking actions.

[0010] A control unit is respectively connected to the first recovery unit and the second recovery unit for control, is used to receive the interlocking signals of the first recovery unit and the second recovery unit, and is also used to control the first recovery unit and the second recovery unit to perform interlocking actions through control instructions and control signals.

[0011] An adjustment unit is connected to the control unit for control, and is used to automatically transport the saturated steam to the boiler upon receiving a control signal.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] The condensate discharged from the unit enters the first recovery unit, and the condensate discharged from the reboiler enters the second recovery unit. At the same time, the superheated steam transported from the boiler through the superheated steam pipeline enters the first recovery unit and the second recovery unit respectively. There is a large temperature difference between the superheated steam and the condensate. The superheated steam heats the condensate to the saturated steam state to completely evaporate all the condensate into the gaseous state. The control unit outputs control signals to the first recovery unit and the second recovery unit to adjust the temperature of the saturated steam output by the two within the process parameter range. During this period, the first recovery unit and the second recovery unit adjust the temperature of the saturated steam output by each through interlocking actions, and are transported to the saturated steam main pipe together in parallel. At the same time, the detected temperature is transmitted to the control unit to input an adjustment instruction to the control unit. The control unit converts the adjustment instruction into a control instruction and outputs a control signal to the adjustment unit, so that the adjustment unit transports the saturated steam to the boiler, so that the saturated steam forms superheated steam after being pressurized and heated in the boiler for recycling, thereby recovering the condensate, avoiding the discharge of condensate from affecting the startup of the device, and eliminating the problem that it is difficult to balance the steam consumption and the temperature control of the condensate.

[0014] Further preferably, the first recovery unit includes:

[0015] The first recovery device, which is connected to the unit and the boiler through pipelines respectively, is used to heat the condensate to saturated steam by means of superheated steam.

[0016] The first heating valve is arranged on the steam pipeline entering the first recovery device.

[0017] The first thermometer is arranged on the steam pipeline between the first recovery device and the first heating valve, is electrically connected to the control unit, and is also associated and interlocked with the first heating valve. It is used to transmit the detected temperature to the control unit in the form of an electrical signal. The first heating valve is used to perform an interlocking action after obtaining the temperature signal and adjust its own opening degree.

[0018] The first steam supply valve is arranged on the saturated steam pipeline of the first recovery device.

[0019] The second thermometer is arranged on the steam pipeline between the first recovery device and the first steam supply valve, is electrically connected to the control unit, and is also associated and interlocked with the first steam supply valve. It is used to transmit the outlet temperature of the first recovery device collected to the control unit in the form of an electrical signal. The first steam supply valve is used to perform an interlocking action after obtaining the temperature signal and adjust its own opening degree to send out saturated steam to the boiler.

[0020] With the above technical solution, after the first heating valve is opened, superheated steam is transported into the first recovery device. After the condensate from the unit exchanges heat with the superheated steam, the condensate is transformed into saturated steam and discharged from the top of the first recovery device, and the superheated steam is also transformed into saturated steam and discharged from the upper part of the first recovery device. The two converge in the saturated steam pipeline. The first steam supply valve and the second thermometer adjust their own opening degrees through associated interlocking actions to send out saturated steam, thereby achieving the purpose of heating the condensate to the saturated state in the first recovery unit.

[0021] Further preferably, the first recovery unit further includes:

[0022] The first reflux pipeline, the ends of which are respectively communicated with the inlet pipeline and the outlet pipeline of the first recovery device.

[0023] The first reflux valve is located on the first reflux pipeline and is associated and interlocked with the second thermometer, and is used to reflux the steam containing a small amount of condensate back into the first recovery device through an interlocking action.

[0024] With the above technical solution, during the startup stage, when the condensate in the first recovery device is not completely transformed into saturated steam, the temperature detected by the second thermometer is lower than the temperature of the saturated steam. At this time, the first reflux valve generates an interlocking action to open and send the steam containing a small amount back to the first recovery device to achieve the purpose of reflux.

[0025] Further preferably, the second recovery unit includes:

[0026] The second recovery device, which is connected to the reboiler and the boiler through pipelines respectively, is used to heat the condensate to saturated steam by means of superheated steam.

[0027] The second heating valve is arranged on the steam pipeline entering the second recovery device.

[0028] The third thermometer is arranged on the steam pipeline between the second recovery device and the second heating valve, is electrically connected to the control unit, and is also associated and interlocked with the second heating valve. It is used to transmit the detected temperature to the control unit in the form of an electrical signal. The second heating valve is used to perform an interlocking action after receiving the control signal to adjust its own opening degree.

[0029] The second air supply valve is arranged on the saturated steam pipeline of the first recovery device.

[0030] The fourth thermometer is arranged on the steam pipeline between the first recovery device and the first air supply valve, is electrically connected to the control unit, and is also associated and interlocked with the fourth thermometer. It is used to transmit the outlet temperature of the first recovery device collected to the control unit in the form of an electrical signal. The first air supply valve is used to obtain the electrical signal of the outlet temperature of the first recovery device and adjust its opening degree through an interlocking action to send out saturated steam to the boiler.

[0031] With the above technical solution, after the second heating valve is opened, the superheated steam is transported into the second recovery device. After the condensate from the reboiler exchanges heat with the superheated steam, the condensate is transformed into saturated steam and discharged from the top of the second recovery device, and the superheated steam is also transformed into saturated steam and discharged from the upper part of the second recovery device. The two converge in the saturated steam pipeline. The second air supply valve and the fourth thermometer adjust their own opening degrees through associated interlocking actions to send out the saturated steam, thereby achieving the purpose of heating the condensate to the saturated state in the second recovery unit.

[0032] Further optimized, the second recovery unit further includes:

[0033] The second reflux pipeline, the ends of which are respectively communicated with the inlet pipeline and the outlet pipeline of the second recovery device.

[0034] The second reflux valve is located on the second reflux pipeline and is associated and interlocked with the fourth thermometer. It is used to reflux the steam containing a small amount of condensate back into the second recovery device through an interlocking action.

[0035] With the above technical solution, during the startup stage, when the condensate in the second recovery device is not all transformed into saturated steam, the temperature detected by the fourth thermometer is lower than the temperature of the saturated steam. At this time, the second reflux valve generates an interlocking action to open, and sends the steam containing a small amount back to the second recovery device to achieve the purpose of reflux.

[0036] Further optimized, the adjustment unit includes:

[0037] The regulating thermometer is installed on the saturated steam pipeline after the first recovery unit and the second recovery unit are connected in parallel.

[0038] The total recovery valve is installed on the saturated steam pipeline, associated and interlocked with the regulating thermometer, and also connected to the control unit for control. It is used to receive the adjustment signal from the control unit and open or close through interlocking actions.

[0039] With the above technical solution, when the temperature detected by the regulating thermometer reaches the process parameter range of saturated steam, the total recovery valve is interlocked and opened to transport the saturated steam to the boiler. At the end of the shutdown stage, due to the gradual decrease in the amount of superheated steam in the boiler, there is a small amount of condensate remaining in the saturated steam pipeline. The total recovery valve is forced to open through the control unit to transport the condensate to the boiler, reducing the on-site discharge of condensate in each section.

[0040] Further optimized, it also includes:

[0041] The bypass valves are respectively installed on the bypass pipelines of the first heating valve, the first air supply valve, the second heating valve, and the second air supply valve, associated and interlocked with the first heating valve, the first air supply valve, the second heating valve, and the second air supply valve, and are used to open or close the bypass pipelines through interlocking actions.

[0042] The recovery bypass valve is installed on the bypass pipeline of the total recovery valve, associated and interlocked with the total recovery valve, and is used to replace the total recovery valve through interlocking actions when the total recovery valve is abnormal.

[0043] With the above technical solution, when the first heating valve, the first air supply valve, the second heating valve, or the second air supply valve has an abnormal jam and cannot perform interlocking actions, the bypass valve acts as a standby valve to trigger interlocking and perform opening or closing. In the open state, it ensures the transportation of superheated steam or saturated steam, and in the closed state, it ensures the cut-off of the first recovery unit or the second recovery unit.

[0044] Further optimized, the control unit includes:

[0045] The regulating control cabinet is respectively connected to the first heating valve, the second heating valve, the first air supply valve, the second air supply valve, and the total recovery valve for control.

[0046] The control terminal is data-connected to the regulating control cabinet and is used to output control instructions to the regulating control cabinet. The regulating control cabinet outputs control signals to the opening degrees of the first heating valve, the second heating valve, the first air supply valve, the second air supply valve, and the total recovery valve according to the control instructions.

[0047] With the above technical solution, the control terminal outputs a control instruction to the adjustment control cabinet, and the adjustment control cabinet sends control signals to the first heating valve, the second heating valve, the first air supply valve, the second air supply valve, and the total recovery valve to forcibly control their opening degrees to ensure that the entire device is in a normal operation or shutdown state.

[0048] Further optimized, the control terminal is connected with an overheat thermometer, which is arranged on the steam pipeline connecting the boiler, the unit and the reboiler, and is used to collect the overheat temperature in the steam pipeline and transmit the overheat temperature to the control terminal.

[0049] With the above technical solution, the overheat thermometer transmits the temperature of the superheated steam to the control terminal, providing an accurate reference basis for artificially outputting adjustment instructions.

[0050] Further optimized, both the first reflux valve and the second reflux valve are electrically connected to the adjustment control and are used to receive control signals to open or close by themselves.

[0051] With the above technical solution, the unsaturated steam is refluxed to the first recovery unit and the second recovery unit through the first reflux valve and the second reflux valve. Description of the Drawings

[0052] Figure 1 It is a schematic diagram of the device layout structure of this embodiment.

[0053] Figure 2 It is a schematic diagram of the internal structure in this embodiment.

[0054] Figure 3 It is a partial cross-sectional view of the first recovery unit in this embodiment.

[0055] Figure 4 It is a schematic diagram of the external structure of the main body in this embodiment.

[0056] Figure 5 It is a schematic diagram of the bottom structure of the first recovery unit in this embodiment.

[0057] Reference Numerals: 1 - unit; 2 - reboiler; 3 - first recovery unit; 31 - first heating valve; 32 - first reflux pipeline; 33 - first recovery unit; 331 - main body; 332 - heating pipe; 333 - steam hole; 34 - first thermometer; 35 - first reflux valve; 36 - second thermometer; 37 - first air supply valve; 4 - second recovery unit; 41 - second heating valve; 42 - second reflux pipeline; 43 - second recovery unit; 44 - third thermometer; 45 - second reflux valve; 46 - fourth thermometer; 47 - second air supply valve; 5 - control unit; 51 - control terminal; 52 - adjustment control cabinet; 6 - adjustment unit; 61 - adjustment thermometer; 62 - total recovery valve; 63 - recovery bypass valve; 7 - overheat thermometer; 8 - bypass valve. Detailed implementation mode

[0058] Under normal circumstances, in the pipe network for recovering condensate, due to the different heat requirements of superheated steam needed in each section and each device, the temperature of the condensate after condensation varies greatly. Then, the temperature of the condensate in each branch pipe is different. In the branch pipe with a higher temperature, there is more steam and less water, while in the branch pipe with a lower temperature, there is less steam and more water. When the water volume reaches a certain level, it will make abnormal noises in the pipeline, generate significant vibrations, and the intuitive phenomenon shown is that the pipeline vibrates. In severe cases, the condensate pipeline on the pipe rack will experience violent oscillations, and even damage its own reinforcement device or pose a risk of pipeline cracking. Especially when the device starts up, the above phenomena are the most frequent and severe. When the pipeline cracks, it is necessary to specifically stop work for maintenance, resulting in a delay in normal start-up and even affecting the production plan. To reduce pipeline cracking, the dispatching room will, according to the start-up situation, allocate the section that conveys condensate at a lower temperature to reduce steam consumption or increase on-site emissions to raise the temperature of the condensate. However, reducing steam consumption will affect the start-up or production of this section, and discharging a large amount of condensate will also affect the normal operation of other equipment in this section and even affect the boiler cycle recovery. Therefore, the balance between steam consumption and condensate temperature control has been in a difficult-to-balance contradiction in a short period of time.

[0059] Therefore, the prominent technical problem mentioned above is that it is difficult to balance steam consumption and condensate temperature control during the device start-up process.

[0060] In response to the above technical problem, the present invention makes the following design and conception: The temperature of the superheated steam collection generated by the boiler is at least above 500 °C, while the temperature of the condensate is below 100 °C. By virtue of the temperature difference and heat difference between the superheated steam and the condensate, the superheated steam is used to heat the condensate to the saturated state to form saturated steam, and the superheated steam will not turn into condensate. In this way, the two are gathered together and transported to the boiler for recycling.

[0061] Based on the above design and conception, the present invention combines Figures 1 - 5 The following is a detailed introduction to this technical solution.

[0062] A steam condensate heating control device, as Figure 1 shown, uses superheated steam to heat the condensate discharged from the unit 1 and the reboiler 2 to saturated steam and transports it to the boiler, including:

[0063] The first recovery unit 3 is respectively connected to the unit 1 and the boiler pipeline, and uses the superheated steam transported by the boiler to heat the condensate from the unit 1 to saturated steam, and is used to adjust the temperature of the saturated steam through interlocking actions.

[0064] The second recovery unit 4 is respectively connected to the reboiler 2 and the boiler pipeline, is in parallel with the first recovery unit 3, and uses the superheated steam transported by the boiler to heat the condensate from the reboiler 2 to saturated steam for regulating the temperature of the saturated steam through interlocking actions.

[0065] The control unit 5 is respectively connected to the first recovery unit 3 and the second recovery unit 4 for receiving the interlock signals of the first recovery unit 3 and the second recovery unit 4, and is also used to control the first recovery unit 3 and the second recovery unit 4 to perform interlocking actions through control instructions and control signals.

[0066] The regulating unit 6 is connected to the control unit 5 for automatically transporting the saturated steam to the boiler upon receiving a control signal.

[0067] The condensate discharged from the unit 1 enters the first recovery unit 3, and the condensate discharged from the reboiler 2 enters the second recovery unit 4. At the same time, the superheated steam transported from the boiler through the superheated steam pipeline enters the first recovery unit 3 and the second recovery unit 4 respectively. There is a large temperature difference between the superheated steam and the condensate, and the superheated steam heats the condensate to the saturated steam state to completely evaporate all the condensate into the gaseous state. The control unit 5 outputs control signals to the first recovery unit 3 and the second recovery unit 4 to adjust the temperature of the saturated steam output by the two within the process parameter range. During this period, the first recovery unit 3 and the second recovery unit 4 adjust the temperature of the saturated steam output by themselves through interlocking actions, and are transported to the saturated steam main pipe together in parallel. At the same time, the detected temperature is transmitted to the control unit 5 to input an adjustment instruction to the control unit 5. The control unit 5 converts the adjustment instruction into a control instruction and outputs a control signal to the regulating unit 6, causing the regulating unit 6 to transport the saturated steam to the boiler so that the saturated steam forms superheated steam after being pressurized and heated in the boiler for recycling, thereby recovering the condensate, avoiding the discharge of condensate from affecting the start-up of the device, and eliminating the problem that it is difficult to balance the steam consumption and the temperature control of the condensate.

[0068] Specifically, the first recovery unit 3 in this embodiment includes:

[0069] The first recovery device 33 is respectively connected to the unit 1 and the boiler through pipelines and is used to heat the condensate to saturated steam by means of superheated steam.

[0070] The first heating valve 31 is arranged on the steam pipeline entering the first recovery device 33.

[0071] The first thermometer 34 is arranged on the steam pipeline between the first recovery device 33 and the first heating valve 31, is electrically connected to the control unit 5, and is also associated with the first heating valve 31 for interlocking. It is used to transmit the detected temperature to the control unit 5 in the form of an electrical signal, and the first heating valve 31 is used to perform an interlocking action after obtaining the temperature signal to adjust its own opening degree.

[0072] The first air supply valve 37 is arranged on the saturated steam pipeline of the first recovery device 33.

[0073] The second thermometer 36 is arranged on the steam pipeline between the first recovery device 33 and the first air supply valve 37, is electrically connected to the control unit 5, and is also associated and interlocked with the first air supply valve 37. It is used to transmit the outlet temperature of the first recovery device 33 collected in the form of an electrical signal to the control unit 5. The first air supply valve 37 is used to perform an interlocking action after obtaining the temperature signal, adjust its own opening degree, and send out saturated steam to the boiler.

[0074] After the first heating valve 31 is opened, superheated steam is transported into the first recovery device 33. After the condensate from the unit 1 exchanges heat with the superheated steam, the condensate is transformed into saturated steam and discharged from the top of the first recovery device 33, and the superheated steam is also transformed into saturated steam and discharged from the upper part of the first recovery device 33. The two converge in the saturated steam pipeline. The first air supply valve 37 and the second thermometer 36 adjust their own opening degrees through an associated interlocking action to send out saturated steam, thereby achieving the purpose of heating the condensate to the saturated state in the first recovery unit 3.

[0075] Specifically, the first recovery unit 3 in this embodiment further includes:

[0076] The first reflux pipeline 32 has its ends respectively communicated with the inlet pipeline and the outlet pipeline of the first recovery device 33.

[0077] The first reflux valve 35 is located on the first reflux pipeline 32 and is associated and interlocked with the second thermometer 36. It is used to reflux the steam containing a small amount of condensate into the first recovery device 33 through an interlocking action.

[0078] During the startup stage, when the condensate in the first recovery device 33 is not all transformed into saturated steam, the temperature detected by the second thermometer 36 is lower than the temperature of the saturated steam. At this time, the first reflux valve 35 generates an interlocking action to open, and sends the steam containing a small amount back to the first recovery device 33 to achieve the purpose of reflux.

[0079] Specifically, the second recovery unit 4 in this embodiment includes:

[0080] The second recovery device 43 is respectively connected to the reboiler 2 and the boiler through pipelines, and is used to heat the condensate to saturated steam by means of superheated steam.

[0081] The second heating valve is arranged on the steam pipeline entering the second recovery device 43.

[0082] The third thermometer 44 is arranged on the steam pipeline between the second recovery device 43 and the second heating valve, is electrically connected to the control unit 5, and is also associated and interlocked with the second heating valve. It is used to transmit the detected temperature to the control unit 5 in the form of an electrical signal. The second heating valve is used to perform an interlocked action after receiving a control signal and adjust its own opening degree.

[0083] The second air supply valve 47 is arranged on the saturated steam pipeline of the first recovery device 33.

[0084] The fourth thermometer 46 is arranged on the steam pipeline between the first recovery device 33 and the first air supply valve 37, is electrically connected to the control unit 5, and is also associated and interlocked with the fourth thermometer 46. It is used to transmit the outlet temperature of the first recovery device 33 collected to the control unit 5 in the form of an electrical signal. The first air supply valve 37 is used to obtain the electrical signal of the outlet temperature of the first recovery device 33 and adjust its opening degree through an interlocked action to send out saturated steam to the boiler.

[0085] After the second heating valve is opened, superheated steam is transported into the second recovery device 43. After the condensate from the reboiler 2 exchanges heat with the superheated steam, the condensate turns into saturated steam and is discharged from the top of the second recovery device 43, and the superheated steam also turns into saturated steam and is discharged from the upper part of the second recovery device 43. The two converge in the saturated steam pipeline. The second air supply valve 47 and the fourth thermometer 46 adjust their own opening degrees through an associated interlocked action to send out saturated steam, so as to achieve the purpose of heating the condensate to the saturated state in the second recovery unit 4.

[0086] Specifically, the second recovery unit 4 in this embodiment further includes:

[0087] The second reflux pipeline 42 has ends respectively communicating with the inlet pipeline and the outlet pipeline of the second recovery device 43.

[0088] The second reflux valve 45 is located on the second reflux pipeline 42 and is associated and interlocked with the fourth thermometer 46. It is used to reflux the steam containing a small amount of condensate into the second recovery device 43 through an interlocked action.

[0089] During the startup stage, when the condensate in the second recovery device 43 has not all turned into saturated steam, the temperature detected by the fourth thermometer 46 is lower than the temperature of the saturated steam. At this time, the second reflux valve 45 generates an interlocked action to open and send the steam containing a small amount back to the second recovery device 43 to achieve the purpose of reflux.

[0090] Specifically, the adjustment unit 6 in this embodiment includes:

[0091] The adjustment thermometer 61 is arranged on the saturated steam pipeline after the first recovery unit 3 and the second recovery unit 4 are connected in parallel.

[0092] The total recovery valve 62 is arranged on the saturated steam pipeline, associated and interlocked with the regulating thermometer 61, and also controlled and connected to the control unit 5. It is used to receive the regulating signal of the control unit 5 and open or close through interlocking actions.

[0093] When the temperature detected by the regulating thermometer 61 reaches the process parameter range of the saturated steam, the total recovery valve 62 is interlocked and opened to convey the saturated steam to the boiler. At the end of the shutdown stage, due to the gradual reduction of the superheated steam volume in the boiler, a small amount of condensate remains in the saturated steam pipeline. The control unit 5 controls the total recovery valve 62 to be forcibly opened to convey the condensate to the boiler, reducing the on-site discharge of condensate in each section.

[0094] Specifically, this embodiment further includes:

[0095] The bypass valve 8 is respectively arranged on the bypass pipelines of the first heating valve 31, the first air supply valve 37, the second heating valve, and the second air supply valve 47, and is associated and interlocked with the first heating valve 31, the first air supply valve 37, the second heating valve, and the second air supply valve 47. It is used to open or close the bypass pipeline through interlocking actions.

[0096] The recovery bypass valve 863 is arranged on the bypass pipeline of the total recovery valve 62 and is associated and interlocked with the total recovery valve 62. When the total recovery valve 62 is abnormal, it is used to replace the total recovery valve 62 through interlocking actions.

[0097] When the first heating valve 31, the first air supply valve 37, the second heating valve, or the second air supply valve 47 has an abnormal jam and cannot perform interlocking actions, the bypass valve 8 acts as a standby valve to trigger interlocking and act to open or close. Among them, the open state ensures the conveyance of superheated steam or saturated steam, and the closed state ensures the cut-off of the first recovery device 33 or the second recovery device 43.

[0098] Specifically, the control unit 5 in this embodiment includes:

[0099] The regulating control cabinet 52 is respectively controlled and connected to the first heating valve 31, the second heating valve, the first air supply valve 37, the second air supply valve 47, and the total recovery valve 62.

[0100] The control terminal 51 is data-connected to the regulating control cabinet 52 and is used to output a control instruction to the regulating control cabinet 52. The regulating control cabinet 52 outputs a control signal to the first heating valve 31, the second heating valve, the first air supply valve 37, the second air supply valve 47, and the opening degrees of the total recovery valve 62 according to the control instruction.

[0101] The control terminal 51 outputs a control instruction to the regulating control cabinet 52, and the regulating control cabinet 52 sends control signals to the first heating valve 31, the second heating valve, the first air supply valve 37, the second air supply valve 47, and the total recovery valve 62 to forcibly control their opening degrees to ensure that the entire device is in a normal operation or shutdown state.

[0102] Specifically, an overheat thermometer 7 is connected to the control terminal 51 in this embodiment. The overheat thermometer 7 is arranged on the steam pipeline connecting the boiler, the unit 1, and the reboiler 2 and is used to collect the overheat temperature in the steam pipeline and transmit the overheat temperature to the control terminal 51.

[0103] The overheat thermometer 7 transmits the temperature of the superheated steam to the control terminal 51, providing an accurate reference basis for manually outputting adjustment instructions.

[0104] Specifically, the first reflux valve 35 and the second reflux valve 45 in this embodiment are both electrically connected to the regulating control and are used to receive control signals to open or close automatically. Unsaturated steam flows back to the first recovery device 33 and the second recovery device 43 through the first reflux valve 35 and the second reflux valve 45.

[0105] Specifically, the structures of the first recovery device 33 and the second recovery device 43 in this embodiment are the same. Taking the first recovery device 33 as an example, please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 , and the description of its structure is as follows:

[0106] The first recovery device 33 includes:

[0107] A main body 331, the bottom of which accesses condensate, and the lower part accesses superheated steam.

[0108] A heating pipe 332 is arranged in the inner cavity of the main body 331. The lower end of the heating pipe 332 is connected to the bottom of the main body 331 and is connected to the first reflux pipeline 32 or the second reflux pipeline 42, and the top end is connected to the top of the main body 331. The steam pipe is coiled inside the main body 331, and the number of coils of the steam pipe at the top of the main body 331 is greater than that at the bottom, thus forming a coiled pipe with a dense upper part and a sparse lower part, so that the condensate just entering the heating pipe 332 flows slowly and is fully heated to the gaseous state by the superheated steam for a long time and is completely evaporated at the lower part of the heating pipe 332 to form steam, making the first recovery device 33 have the characteristic of sufficient heating. When the steam gradually rises to the denser part at the top of the heating pipe 332, it can quickly be output from the top of the main body 331.

[0109] Steam holes 333 are opened at the lower end of the main body 331 and are connected to the superheated steam pipeline and are used to introduce superheated steam into the cavity inside the main body 331.

[0110] The condensate flows in the heating pipe 332 and is heated. The space between the heating pipe 332 and the main body 331 is filled with superheated steam. Heat exchange occurs between the superheated steam and the condensate through the pipe wall of the heating pipe 332, thereby heating the condensate to the saturated steam state.

[0111] Working principle and process

[0112] Please combine Figures 1 - 5 The condensate coming out of the unit 1 enters the heating pipe 332 at the bottom of the first recovery device 33, and the condensate coming out of the reboiler 2 enters the internal heating pipe 332 at the bottom of the second recovery device 43. The superheated steam transported through the superheated steam pipeline from the boiler enters the first recovery unit 3 and the second recovery unit 4 respectively. Specifically, the superheated steam passes through the first heating valve 31 and the second heating valve and enters the cavity inside the first recovery device 33 and the cavity inside the second recovery device 43 through the steam holes 333 respectively. In the middle and lower part of the heating pipe 332, the condensate is heated to the steam state by the superheated steam to form steam. When the steam gradually rises to the top in the heating pipe 332, the superheated steam continues to heat it to the saturated state.

[0113] When the temperature of the second thermometer 36 reaches the temperature parameter range of the saturated steam, the first air supply valve 37 triggers an interlock action and opens to output the saturated steam. Similarly, when the temperature of the fourth thermometer 46 reaches the temperature parameter range of the saturated steam, the second air supply valve 47 triggers an interlock action and opens to output the saturated steam. When the temperature of the regulating thermometer 61 reaches the temperature parameter range of the saturated steam, the total recovery valve 62 triggers an interlock action and opens to transport the saturated steam to the boiler.

[0114] At the same time, the first thermometer 34, the second thermometer 36, the third thermometer 44, the fourth thermometer 46, the regulating thermometer 61, and the superheated thermometer 7 all transmit the detected temperatures in the form of electrical signals to the regulating control cabinet 52. The regulating control cabinet 52 is transmitted to the control terminal 51 after conversion processing, and the control terminal 51 presents the temperatures respectively. When the temperature fluctuates near the saturated steam parameters, the regulating control cabinet 52 outputs control signals to the first heating valve 31 and the second heating valve to adjust the temperature of the output saturated steam within the process parameter range.

[0115] In summary, there is a large temperature difference between the superheated steam and the condensate. The superheated steam heats the condensate to the saturated steam state to completely evaporate all the condensate into the gaseous state. The first heating valve 31 and the second heating valve adjust the temperature of the saturated steam output by each of them through interlocking actions, and are conveyed to the saturated steam main pipe together in parallel. At the same time, the detected temperature is transmitted to the control unit 5, and an adjustment instruction is input to the control unit 5. The control unit 5 converts the adjustment instruction into a control instruction and outputs a control signal to the adjustment unit 6, so that the adjustment unit 6 conveys the saturated steam to the boiler, so that the saturated steam forms superheated steam after being pressurized and heated in the boiler and then is recycled, or the saturated steam is sent back to this section through another pipeline, such as Figure 1 shown, directly used as the heat source for other equipment in this section, such as, and the heated steam is recycled in this section, saving or reducing the steam consumption delivered by the boiler, saving the steam consumption in the main pipeline, and achieving an excellent effect of self-recycling. Through the above two ways of recovering condensate, the present invention not only avoids discharging condensate and affecting the start-up of the device, but also eliminates the problem that it is difficult to balance the steam consumption and the temperature control of the condensate, and maximizes the recycling and reuse of steam recovery.

[0116] This specific embodiment is only an interpretation of the invention, and it is not a limitation of the invention. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as it is within the protection scope of the present invention, it is protected by the patent law.

Claims

1. A steam condensate heating control device heats the condensate discharged from the unit (1) and the reboiler (2) to saturated steam by using superheated steam and transports it to the boiler; characterized in that, Comprising: A first recovery unit (3), which is respectively connected to the unit (1) and the boiler pipeline, uses the superheated steam transported by the boiler to heat the condensate from the unit (1) to saturated steam, the superheated steam is transformed into saturated steam, and the two converge in the saturated steam pipeline, and is used to adjust the temperature of the saturated steam through an interlock action; A second recovery unit (4), which is respectively connected to the reboiler (2) and the boiler pipeline, is connected in parallel with the first recovery unit (3), uses the superheated steam transported by the boiler to heat the condensate from the reboiler (2) to saturated steam, the superheated steam is transformed into saturated steam, and the two converge in the saturated steam pipeline, and is used to adjust the temperature of the saturated steam through an interlock action; A control unit (5), which is respectively connected to the first recovery unit (3) and the second recovery unit (4) for control, is used to receive the interlock signals of the first recovery unit (3) and the second recovery unit (4), and is also used to control the first recovery unit (3) and the second recovery unit (4) to perform interlock actions through control instructions and control signals; An adjustment unit (6), which is connected to the control unit (5) for control, is used to automatically transport the saturated steam to the boiler upon receiving the control signal.

2. The steam condensate heating control device according to claim 1, wherein The first recovery unit (3) includes: A first recovery device (33), which is respectively connected to the unit (1) and the boiler through pipelines, and is used to heat the condensate to saturated steam by means of the superheated steam; A first heating valve (31), which is arranged on the steam pipeline entering the first recovery device (33); A first thermometer (34), which is arranged on the steam pipeline between the first recovery device (33) and the first heating valve (31), is electrically connected to the control unit (5), and is also associated with the first heating valve (31) for interlock. It is used to transmit the detected temperature to the control unit (5) in the form of an electrical signal. The first heating valve (31) is used to perform an interlock action after obtaining the temperature signal and adjust its own opening; A first air supply valve (37), which is arranged on the saturated steam pipeline of the first recovery device (33); A second thermometer (36), which is arranged on the steam pipeline between the first recovery device (33) and the first air supply valve (37), is electrically connected to the control unit (5), and is also associated with the first air supply valve (37) for interlock. It is used to transmit the outlet temperature of the first recovery device (33) collected to the control unit (5) in the form of an electrical signal. The first air supply valve (37) is used to perform an interlock action after obtaining the temperature signal and adjust its own opening to send out the saturated steam to the boiler.

3. The steam condensate heating control device according to claim 2, wherein The first recovery unit (3) further includes: A first return pipeline (32), the ends of which are respectively communicated with the inlet pipeline and the outlet pipeline of the first recovery device (33); A first return valve (35), which is located on the first return pipeline (32) and is associated with the second thermometer (36) for interlock, and is used to return the steam containing a small amount of condensate to the first recovery device (33) through an interlock action.

4. The steam condensate heating control device according to claim 3, wherein The second recovery unit (4) includes: The second recovery device (43) is respectively connected to the reboiler (2) and the boiler through pipelines, and is used to heat the condensate to saturated steam by means of the superheated steam; The second heating valve (41) is arranged on the steam pipeline entering the second recovery device (43); The third thermometer (44) is arranged on the steam pipeline between the second recovery device (43) and the second heating valve (41), is electrically connected to the control unit (5), and is also associated and interlocked with the second heating valve (41). It is used to transmit the detected temperature to the control unit (5) in the form of an electrical signal. The second heating valve (41) is used to perform an interlocking action after receiving the control signal and adjust its own opening degree; The second air supply valve (47) is arranged on the saturated steam pipeline of the first recovery device (33); The fourth thermometer (46) is arranged on the steam pipeline between the first recovery device (33) and the first air supply valve (37), is electrically connected to the control unit (5), and is also associated and interlocked with the fourth thermometer (46). It is used to transmit the outlet temperature of the first recovery device (33) collected to the control unit (5) in the form of an electrical signal. The first air supply valve (37) is used to obtain the electrical signal of the outlet temperature of the first recovery device (33), and adjusts the opening degree through an interlocking action to send out the saturated steam to the boiler.

5. The steam condensate heating control device according to claim 4, wherein The second recovery unit (4) further includes: The second return pipeline (42) has ends respectively communicating with the inlet pipeline and the outlet pipeline of the second recovery device (43); The second return valve (45) is located on the second return pipeline (42) and is associated and interlocked with the fourth thermometer (46). It is used to return the steam containing a small amount of condensate to the second recovery device (43) through an interlocking action.

6. The steam condensate heating control device according to claim 5, characterized in that, The adjustment unit (6) includes: The adjustment thermometer (61) is arranged on the saturated steam pipeline after the first recovery unit (3) and the second recovery unit (4) are connected in parallel; The total recovery valve (62) is arranged on the saturated steam pipeline, is associated and interlocked with the adjustment thermometer (61), and is also controlled and connected to the control unit (5). It is used to open or close through an interlocking action after receiving the adjustment signal of the control unit (5).

7. The steam condensate heating control device according to claim 6, wherein It further includes: The bypass valves (8) are respectively arranged on the bypass pipelines of the first heating valve (31), the first air supply valve (37), the second heating valve (41), and the second air supply valve (47), and are associated and interlocked with the first heating valve (31), the first air supply valve (37), the second heating valve (41), and the second air supply valve (47). They are used to open or close the bypass pipelines through an interlocking action; The recovery bypass valve (63) is arranged on the bypass pipeline of the total recovery valve (62) and is associated and interlocked with the total recovery valve (62). When the total recovery valve (62) is abnormal, it is used to replace the total recovery valve (62) through an interlocking action.

8. The steam condensate heating control device according to claim 7, wherein, The control unit (5) includes: The adjustment control cabinet (52) is respectively connected to the first heating valve (31), the second heating valve (41), the first air supply valve (37), the second air supply valve (47) and the total recovery valve (62) for control connection; The control terminal (51) is data-connected to the adjustment control cabinet (52) and is used for outputting control instructions. The adjustment control cabinet (52) outputs control signals to the opening degrees of the first heating valve (31), the second heating valve (41), the first air supply valve (37), the second air supply valve (47) and the total recovery valve (62) according to the control instructions.

9. The steam condensate heating control device according to claim 8, wherein, The control terminal (51) is connected to an overheat thermometer (7). The overheat thermometer (7) is arranged on the steam pipeline connecting the boiler to the unit (1) and the reboiler (2) and is used for collecting the overheat temperature in the steam pipeline and transmitting the overheat temperature to the control terminal (51).

10. The steam condensate heating control device according to claim 9, characterized in that, The first reflux valve (35) and the second reflux valve (45) are both electrically connected to the adjustment control cabinet (52) and are used for receiving the control signal to open or close by themselves.

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