A steam supply system

Abstract

The application discloses a steam supply system, which comprises a first boiler, a first steam cylinder, high-pressure steam equipment, low-pressure steam equipment and a deoxygenated water tank; the first boiler is provided with a first output pipe, a first input pipeline, a first special safety valve and a first common safety valve, the take-off pressure of the first special safety valve is greater than that of the first common safety valve; the diffusion pipe of the first special safety valve is communicated with the atmosphere, the diffusion pipe of the first common safety valve is connected with a first heater in the deoxygenated water tank through a third input pipeline, and the third input pipeline is provided with a second pressure reducing valve. The special safety valve and the common safety valve with a take-off pressure less than the special safety valve are arranged on the boiler at the same time, the common safety valve is preferentially taken off when the pressure of the boiler or the pipeline is too high, the diffusion pipe of the common safety valve is connected with the heater in the deoxygenated water tank, energy is fully utilized, and environmental pollution is avoided.

Description

Technical Field

[0001] This application relates to the field of industrial boiler technology, and more specifically, to a steam supply system. Background Technology

[0002] Traditional boilers, pressure vessels, and pressure pipelines are equipped with at least one safety valve. Some systems have multiple safety valves, each with a different tripping pressure. As a safety accessory, when the steam pressure is too high, the safety valve trips to release pressure, thus protecting the pressure vessel and pipeline. This type of safety valve is special equipment, a safety accessory mandated by the quality supervision bureau; no other valves or accessories can be installed on its vent pipe. However, because the vent pipe of this type of safety valve is directly connected to the atmosphere, the energy within the released steam cannot be recovered and utilized, resulting in energy waste and environmental pollution. Summary of the Invention

[0003] This application provides a steam supply system in which a special safety valve and a regular safety valve with a lower tripping pressure are installed on the boiler. When the pressure in the boiler or pipeline is too high, the regular safety valve will trip first to avoid tripping the special safety valve. The vent pipe of the regular safety valve is connected to the heater in the deoxygenated water tank. The high-pressure steam in the vent pipe is used to heat the softened water in the deoxygenated water tank to remove oxygen from the softened water. This fully utilizes energy and avoids environmental pollution.

[0004] This application provides a steam supply system, including a first boiler, a first steam distribution cylinder, high-pressure steam-using equipment, low-pressure steam-using equipment, and a deaerator water tank;

[0005] The first boiler is equipped with a first output pipe, a first input pipe, a first special safety valve, and a first ordinary safety valve. The opening pressure of the first special safety valve is greater than that of the first ordinary safety valve. The first output pipe is connected to the input port of the first steam distributor. The second output pipe of the first steam distributor is connected to the high-pressure steam-using equipment. A second electric valve is installed on the second output pipe. A first pressure-reducing valve is installed on the third output pipe of the first steam distributor. The output end of the first pressure-reducing valve is connected to a second input pipe that is connected to the low-pressure steam-using equipment. A first electric valve is installed on the second input pipe.

[0006] A water pump is installed at the outlet of the deoxygenated water tank. The output port of the water pump is connected to the first input pipeline. A first valve is installed on the first input pipeline. The vent pipe of the first special safety valve is open to the atmosphere. The vent pipe of the first ordinary safety valve is connected to the first heater inside the deoxygenated water tank through the third input pipeline. A second pressure reducing valve is installed on the third input pipeline.

[0007] Preferably, on the second input pipeline, a second special safety valve and a second ordinary safety valve are provided upstream of the first electric valve. The vent pipe of the second special safety valve is open to the atmosphere, and the vent pipe of the second ordinary safety valve is connected to the first heater in the deoxygenated water tank through the third input pipeline. The opening pressure of the second special safety valve is greater than the opening pressure of the second ordinary safety valve.

[0008] Preferably, on the second output pipe, upstream of the second electric valve, there is a third special safety valve and a third ordinary safety valve. The vent pipe of the third special safety valve is open to the atmosphere, and the vent pipe of the third ordinary safety valve is connected to the first heater in the deoxygenated water tank through the third input pipe. The starting pressure of the third special safety valve is greater than the starting pressure of the third ordinary safety valve.

[0009] Preferably, the output end of the first pressure reducing valve is provided with a fourth input pipe connected to the air conditioning humidifier, and a third electric valve is provided on the fourth input pipe.

[0010] Preferably, on the fourth input pipeline, a fourth special safety valve and a fourth ordinary safety valve are provided upstream of the third electric valve. The vent pipe of the fourth special safety valve is open to the atmosphere, and the vent pipe of the fourth ordinary safety valve is connected to the first heater in the deoxygenated water tank through the third input pipeline. The opening pressure of the fourth special safety valve is greater than that of the fourth ordinary safety valve.

[0011] Preferably, the steam supply system further includes a second boiler, which is equipped with a fourth output pipe, a fourth input pipe, a fifth special safety valve, and a fifth ordinary safety valve. The opening pressure of the fifth special safety valve is greater than that of the fifth ordinary safety valve.

[0012] The fourth output pipe is equipped with a second valve, and the end of the fourth output pipe is connected to the input end of the first pressure reducing valve; the fourth input pipe is connected to the output port of the water pump, and the fourth input pipe is equipped with a third valve; the vent pipe of the fifth special safety valve is open to the atmosphere, and the vent pipe of the fifth ordinary safety valve is connected to the first heater in the deoxygenated water tank through the third input pipe.

[0013] Preferably, the first steam separator is equipped with a sixth special safety valve and a sixth ordinary safety valve, the opening pressure of the sixth special safety valve is greater than the opening pressure of the sixth ordinary safety valve; the vent pipe of the sixth ordinary safety valve is connected to the first heater in the deaerator tank through the third input pipe.

[0014] Preferably, the steam supply system further includes a second steam distributor, the inlet of which is connected to a third outlet pipe, the fifth outlet pipe of which is connected to a second inlet pipe, and the sixth outlet pipe of which is connected to a second heater in the deaerator tank via the fifth inlet pipe.

[0015] Preferably, the output end of the first pressure reducing valve is provided with a sixth input pipeline connected to the fifth input pipeline.

[0016] Preferably, the second steam cylinder is equipped with a seventh special safety valve and a seventh ordinary safety valve, the opening pressure of the seventh special safety valve is greater than the opening pressure of the seventh ordinary safety valve; the vent pipe of the seventh ordinary safety valve is connected to the first heater in the deaerator tank through the third input pipe.

[0017] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0019] Figure 1 A schematic diagram of the steam supply system provided in this application. Detailed Implementation

[0020] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0021] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0022] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0023] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0024] This application provides a steam supply system that simultaneously installs a special safety valve and a general safety valve with a lower tripping pressure on the boiler. When the pressure in the boiler or pipeline is too high, the general safety valve trips first, preventing the special safety valve from tripping. Furthermore, the vent pipe of the general safety valve is connected to a heater in the deaerator tank. The high-pressure steam in the vent pipe is used to heat the softened water in the deaerator tank to remove oxygen, thus fully utilizing energy and avoiding environmental pollution. Additionally, the steam distribution cylinder and steam-using equipment also employ a dual safety valve structure, further preventing energy waste and environmental pollution. Moreover, this application uses two boilers. When steam demand is low, a single boiler is used; when steam demand is high, one boiler operates at high pressure, providing high-pressure steam, while the other operates at low pressure, providing low-pressure steam. This achieves energy savings and eliminates the need for frequent adjustment of high-pressure steam to low pressure, which helps protect the valve core and spring of the pressure-reducing valve, extending its service life. Furthermore, even if the pressure-reducing valve fails, it will not affect the normal steam supply to the low-pressure steam-using equipment.

[0025] As an example, such as Figure 1 As shown, the steam supply system provided in this application includes a first boiler 8, a first steam distribution cylinder 109, a high-pressure steam-using device 53, a low-pressure steam-using device 66, and a deaerator water tank 123.

[0026] The first boiler 8 is equipped with a first output pipe, a first input pipe, a first special safety valve 11, and a first ordinary safety valve 12. The opening pressure of the first special safety valve 11 is greater than the opening pressure of the first ordinary safety valve 12. For example... Figure 1 As shown, the first output pipe includes pipe 10 and pipe 15, and valves 9 and 16 are provided on the first output pipe for controlling the opening and closing of the first output pipe.

[0027] The first output pipe is connected to the input port of the first steam distributor 109, and the second output pipe of the first steam distributor 109 is connected to the high-pressure steam-using equipment 53. A second electric valve 52 is provided on the second output pipe. Specifically, from the first steam distributor 109 to the high-pressure steam-using equipment 53, the second output pipe sequentially includes pipe 22, pipe 43, and pipe 51. A valve 17 is provided on pipe 22, a pressure sensor 44 is provided on pipe 43, and a second electric valve 52 is provided on pipe 51.

[0028] A first pressure-reducing valve 34 is installed on the third output pipe of the first steam cylinder 109, and a first electric valve 65 is installed on the second input pipe. Specifically, the third output pipe includes pipes 26, 24, and 23. A valve 18 is installed on pipe 26, and a first pressure-reducing valve 34 is installed on pipe 23. The output end of the first pressure-reducing valve 34 is connected to a second input pipe that is connected to the low-pressure steam-using equipment 66. The second input pipe includes pipes 40, 41, 55, and 64. A valve 37 is installed on pipe 40, a pressure-reducing valve 56 and a pressure sensor 57 are installed on pipe 55, and a first electric valve 65 is installed on pipe 64.

[0029] A water pump 119 is installed on the pipe 118 at the outlet of the deoxygenated water tank 123. The output port of the water pump 119 is connected to the first input pipe, and a first valve 112 is installed on the first input pipe. Specifically, the first input pipe includes a pipe 111, and the first valve 112 is installed on the pipe 111.

[0030] The vent pipe of the first special safety valve 11 is open to the atmosphere. The vent pipe of the first ordinary safety valve 12 is connected to the first heater 122 inside the deoxygenated water tank 123 via a third input pipe. A second pressure reducing valve 97 is installed on the third input pipe. Specifically, the third input pipe is located at the inlet of the first heater 122. Pipes 110, 108, and 98 are provided between the vent pipe of the first ordinary safety valve 12 and the third input pipe. A flow meter 13 and a check valve 14 are installed on pipe 108.

[0031] Preferably, on the second input pipeline, a second special safety valve 58 and a second ordinary safety valve 60 are provided upstream of the first electric valve 65. The vent pipe 59 of the second special safety valve 58 is open to the atmosphere, and the vent pipe of the second ordinary safety valve 60 is connected to the first heater 122 in the deoxygenated water tank 123 through the third input pipeline. The opening pressure of the second special safety valve 58 is greater than the opening pressure of the second ordinary safety valve 60. A flow meter 61 and a check valve 62 are provided on the pipe 63 between the vent pipe of the second ordinary safety valve 60 and the third input pipeline.

[0032] Preferably, on the second output pipe, upstream of the second electric valve 52, there is a third special safety valve 45 and a third ordinary safety valve 47. The vent pipe 46 of the third special safety valve 45 is open to the atmosphere, and the vent pipe of the third ordinary safety valve 47 is connected to the first heater 122 in the deoxygenated water tank 123 through the third input pipe. The opening pressure of the third special safety valve 45 is greater than the opening pressure of the third ordinary safety valve 47. Between the vent pipe of the third ordinary safety valve 47 and the third input pipe, there are pipes 50, 54, 67, 81, 95, and 96. Pipe 50 is equipped with a flow meter 48 and a one-way valve 49.

[0033] Preferably, the output end of the first pressure reducing valve 34 is provided with a fourth input pipe connected to the air conditioning humidifier 79, and a third electric valve 78 is provided on the fourth input pipe. Specifically, the fourth input pipe includes pipe 39, pipe 42 and pipe 77, pipe 39 is provided with a valve 36, and pipe 77 is provided with an electric valve 68, a pressure reducing valve 69, a pressure sensor 70 and the third electric valve 78.

[0034] Preferably, on the fourth input pipeline, a fourth special safety valve 71 and a fourth ordinary safety valve 73 are provided upstream of the third electric valve 78. The vent pipe 72 of the fourth special safety valve 71 is open to the atmosphere, and the vent pipe of the fourth ordinary safety valve 73 is connected to the first heater 122 in the deoxygenated water tank 123 through the third input pipeline. The opening pressure of the fourth special safety valve 71 is greater than the opening pressure of the fourth ordinary safety valve 73. A flow meter 74 and a check valve 75 are provided on the pipe 76 between the vent pipe of the fourth ordinary safety valve 73 and the third input pipeline.

[0035] Preferably, the first steam distribution cylinder 109 is equipped with a sixth special safety valve 19 and a sixth ordinary safety valve 20, the opening pressure of the sixth special safety valve 19 being greater than the opening pressure of the sixth ordinary safety valve 20. The vent pipe of the sixth ordinary safety valve 20 is connected to the first heater 122 in the deaerator tank 123 via a third input pipe. Pipes 29 and 98 are provided between the vent pipe of the sixth ordinary safety valve 20 and the third input pipe, and a flow meter 27 and a check valve 28 are provided on pipe 29.

[0036] Preferably, the steam supply system further includes a second boiler 1, which is equipped with a fourth output pipe, a fourth input pipe, a fifth special safety valve 4, and a fifth ordinary safety valve 5. The opening pressure of the fifth special safety valve 4 is greater than that of the fifth ordinary safety valve 5. A second valve 2 is provided on the fourth output pipe, and the end of the fourth output pipe is connected to the input end of the first pressure reducing valve 34. Specifically, the fourth output pipe includes pipe 3 and pipe 21, with the ends of pipe 21 and pipe 23 connected, thereby connecting to the input end of the first pressure reducing valve 34. The fourth input pipe is connected to the output port of the water pump 119, and a third valve 113 is provided on the fourth input pipe. Specifically, the fourth input pipe includes pipe 116 connected to pipe 118 and pipe 114 connected to the second boiler 1, and the third valve 113 is installed on pipe 114. The vent pipe of the fifth ordinary safety valve 5 is connected to the first heater 122 in the deaerator tank 123 through the third input pipe. A flow meter 6 and a check valve 7 are installed on the pipeline (including pipelines 115, 117, and 108) between the vent pipe of the fifth general safety valve 5 and the third input pipeline. The end of pipeline 108 is connected to the end of pipeline 98, thereby connecting to the third input pipeline. A flow meter 6 and a check valve 7 are installed on pipeline 115.

[0037] Preferably, the steam supply system further includes a second steam distributor 107. The inlet of the second steam distributor 107 (connected to a pipe 33 with a valve 32) is connected to a third output pipe (specifically, part of pipe 26) via pipe 25, thereby connecting to the first steam distributor 109. The fifth output pipe 102 of the second steam distributor 107 is connected to the second input pipe, specifically, via a pipe 102 with a valve 31 connected to the end of pipe 41. The sixth output pipe of the second steam distributor 107 is connected to the second heater 120 in the deaerator tank 123 via the fifth input pipe. A baffle 121 is provided between the first heater 122 and the second heater 120. Specifically, a valve 104 is provided on the sixth output pipe. The fifth input pipe includes pipes 82, 91, 93, and 94, and a pressure reducing valve 83, a pressure sensor 84, and an electric valve 92 are provided on the fifth input pipe.

[0038] Preferably, the fifth input pipeline (specifically pipeline 82) is equipped with a ninth special safety valve 85 and a ninth ordinary safety valve 87, the opening pressure of the ninth special safety valve 85 being greater than the opening pressure of the ninth ordinary safety valve 87. The vent pipe 86 of the ninth special safety valve 85 is open to the atmosphere, and the vent pipe of the ninth ordinary safety valve 87 is connected to the first heater 122 in the deaerator tank 123 via the third input pipeline. A pipeline 90 is provided between the vent pipe of the ninth ordinary safety valve 87 and the third input pipeline, and a flow meter 88 and a check valve 89 are provided on the pipeline 90.

[0039] Preferably, the output end of the first pressure reducing valve 34 is provided with a sixth input pipe 38 connected to the fifth input pipe, and a valve 35 is provided on the sixth input pipe 38.

[0040] Preferably, the second steam distribution cylinder 107 is equipped with a seventh special safety valve 106 and a seventh ordinary safety valve 105. The opening pressure of the seventh special safety valve 106 is greater than that of the seventh ordinary safety valve 105. The vent pipe of the seventh ordinary safety valve 105 is connected to the first heater 122 in the deaerator tank 123 through a third input pipe. A flow meter 100 and a check valve 101 are installed on the pipe 99 between the vent pipe of the seventh ordinary safety valve 105 and the third input pipe.

[0041] The seventh output pipe 103 of the second cylinder 107 is connected to the fourth input pipe, thereby connecting to the air conditioning humidifier 79. A valve 30 is provided on the seventh output pipe 103.

[0042] The deoxygenated water tank 123 is equipped with a water distributor 124. The outlet of the water distributor 124 is connected to the third heater 133 in the soft water tank 136 via an eighth output pipe. The eighth output pipe includes pipes 126, 129, and 132. Pipe 126 is equipped with a flow meter 125 and an electric valve 128. The deoxygenated water tank 123 is equipped with an eighth special safety valve 147 and an eighth ordinary safety valve 148. The opening pressure of the eighth special safety valve 147 is greater than that of the eighth ordinary safety valve 148. The vent pipe of the eighth ordinary safety valve 148 is connected to the fourth heater 137 in the soft water tank 136 via a ninth output pipe. The ninth output pipe includes pipes 143, 141, 134, and 135. Pipe 143 is equipped with a flow meter 144 and a check valve 145. The soft water tank 136 is equipped with a vent pipe 131. The outlet of the soft water tank 136 is connected to the inlet of the water distributor 124 via a return pipe. The return pipe includes pipes 139, 140, and 142. A water pump 138 is installed on pipe 139, and an electric valve 146 is installed on pipe 142. The soft water tank 136 is connected to the soft water station 127 via pipe 130.

[0043] Preferably, the eighth output pipe of the water distributor 124 is also provided with a branch pipe 80 connected to the input port of the third electric valve 78, thereby connecting to the air conditioning humidifier 79.

[0044] In winter, the oxygen-rich vented steam emitted from the deaerator 123 can enter the air conditioning humidifier 79 through the branch pipe of the eighth output pipe of the water distributor 124 and the third electric valve 78 to humidify the air. The humidified air in the air conditioning humidifier 79 is then transported into the workshop to regulate the workshop's temperature and humidity. Since the vented steam from the deaerator 123 not only contains a large amount of heat energy but is also rich in oxygen, it implicitly increases the oxygen content in the workshop while controlling the temperature and humidity, thus improving the environment. Therefore, the control system automatically counts the flow rate of the flow meter 125. When the vented steam counted by the flow meter 125 is sufficient, the electric valve 68 closes, prioritizing the use of the oxygen-containing steam emitted from the deaerator 123 into the air conditioning humidifier 79. When the vented steam counted by the flow meter 125 is insufficient, the electric valve 68 opens appropriately, and the steam generated by the second steam distributor 107 is reduced to low-pressure steam through the fourth input pipe and the pressure reducing valve 69 before entering the air conditioning humidifier 79 through the pipe 77 and the third electric valve 78. Therefore, this application prioritizes the use of oxygen-containing steam released from the deoxygenated water tank 123 to enter the air conditioning humidifier 79 to regulate the temperature and humidity of the workshop, which not only saves energy but also increases the oxygen content of the workshop.

[0045] In summer, since the air conditioner humidifier 79 does not require steam humidification, the vented steam from the deoxygenated water tank 123 can enter the third heater 133 through the eighth output pipe to heat the softened water in the soft water tank 136. Because the deoxygenated water tank 123 can vent steam itself, it indicates that the temperature inside the deoxygenated water tank is greater than 100 degrees Celsius, and the vented steam cannot be absorbed by itself. Therefore, if the opening pressure setting of the eighth ordinary safety valve 148 of the deoxygenated water tank 123 is less than the opening value of the eighth special safety valve 147, and the eighth ordinary safety valve 148 opens, the vented steam will enter the fourth heater 137 through the ninth output pipe to heat the softened water in the soft water tank 136. Since the softened water is exposed to air and is made from tap water, the oxygen content in the water is already saturated, and as the water temperature rises, the oxygen content gradually decreases. When the water temperature reaches above 100 degrees Celsius, the oxygen content in the water is 0 mg / L. Therefore, the oxygenated steam released from the deaerator 123 heats the softened water. The softened water only absorbs the heat energy from the released steam and the water itself. Since the temperature of the softened water in the softened water tank 136 has increased and the oxygen content is already saturated, the oxygen content in the softened water in the softened water tank 136 will not only not increase, but will actually decrease. In this way, the softened water produced by the softened water station 127 continuously enters the softened water tank 136 through the pipe 130. After being heated by the steam released from the deaerator, the softened water in the softened water tank 136 enters the water distributor 124 through the return water pipe. After the initial heat exchange with the released steam in the water distributor 124, it falls into the deaerator 123. After the water in the deaerator 123 is heated and deoxygenated, it is supplied to the first boiler 8 through the pipe 118 and the first input pipe, and to the second boiler 1 through the pipe 118 and the fourth input pipe.

[0046] In this application, some equipment and pipelines are equipped with both special safety valves and ordinary safety valves. Special safety valves are those mandated by relevant regulations and quality supervision bureaus, requiring periodic calibration; they are classified as special equipment. Ordinary safety valves are special accessories, not mandatory, and managed as ordinary accessories. It should be noted that there can be one or more special safety valves on the equipment and pipelines, depending on the needs. Different special safety valves have different opening pressures, but all are higher than the ordinary safety valves on the same equipment or pipeline. The set opening pressure of the ordinary safety valve is lower than that of the special safety valve. If the steam pressure increases, the ordinary safety valve will open first. The vent pipe of the ordinary safety valve is connected to the deaerator tank (see above description). The steam released when the ordinary safety valve opens can be used to heat softened water. This not only recovers and reuses the released steam but also prevents the special safety valve from releasing steam into the atmosphere through the vent pipe, thus preventing wasted heat energy and environmental pollution. The special safety valve will only open if the ordinary safety valve fails.

[0047] In addition, a flow meter is installed on the exhaust pipe of each ordinary safety valve. If an ordinary safety valve trips, the relevant flow meter will display the flow rate. This not only helps determine which equipment or pressure reducing valve malfunction caused the steam pressure to rise, but also helps determine which safety valve tripped, facilitating equipment diagnosis, maintenance, and recovery.

[0048] Furthermore, this application prioritizes using the steam released from the safety valves to heat the softened water. Specifically, when the control system calculates that the steam release flow from all ordinary safety valves is sufficient to heat the softened water in the deaerator tank 123 to 104 degrees Celsius, the electric valve 92 closes, preventing steam from the second steam distributor 107 or the second boiler 1 from entering the deaerator tank 123. When the control system calculates that the steam release flow from all ordinary safety valves is insufficient to heat the softened water in the deaerator tank 123 to 104 degrees Celsius, the electric valve 92 opens appropriately according to the water temperature. Steam from the second steam distributor 107 or the second boiler 1 is then depressurized by the pressure reducing valve 83 and then enters the second heater 120 through the fifth input pipeline to heat the softened water in the deaerator tank 123, maximizing the use of the steam released by the safety valves to save energy.

[0049] Based on the above, the method of using the steam supply system of this application is as follows:

[0050] (1) When one boiler can meet the high-pressure and low-pressure steam demand of the entire plant, the first boiler 8 operates at high pressure and the second boiler 1 is shut down (at this time, the high-pressure steam generated by the first boiler 8 enters the first steam distributor 109), or the second boiler 1 operates at high pressure and the first boiler 8 is shut down (at this time, the high-pressure steam generated by the second boiler 1 enters the first steam distributor 109). The steam in the first steam distributor 109 enters the high-pressure steam-using equipment 53 through the second output pipe. When only the first boiler 8 is operating at high pressure, the high-pressure steam generated by the first steam distributor 109 can also enter the second steam distributor 107 through pipes 26, 25 and 33; when only the second boiler 1 is operating at high pressure, the high-pressure steam generated by the second boiler 1 can directly enter the second steam distributor 107. The steam generated by the second steam separator 107 can enter the pressure reducing valve 56 through pipe 102 and the second input pipe, and after being reduced to low-pressure steam, it can be used in the low-pressure steam-using equipment 66; the steam generated by the second steam separator 107 can also enter the pressure reducing valve 69 through pipe 103 and the fourth input pipe, and after being reduced to low-pressure steam, it can be used in the air conditioning humidifier 79; the steam generated by the second steam separator 107 can also enter the pressure reducing valve 83 through the fifth input pipe, and after being reduced to low-pressure steam, it can enter the second heater 120 to heat the softened water in the deoxygenated water tank 123 and remove oxygen from the softened water in the deoxygenated water tank.

[0051] If only a single main pressure reducing valve is installed on the main pipeline (i.e., pipeline 23), the diameter of the steam supply pipeline for the low-pressure steam-using equipment must be larger, increasing investment and hindering installation. In this case, if the main pressure reducing valve malfunctions and cannot reduce the high-pressure steam to low-pressure steam on the main pipeline, not only will the safety valve downstream of the main pressure reducing valve trip to release steam, but the entire low-pressure steam-using equipment may be unable to operate. If pressure reducing valves (i.e., pressure reducing valves 56, 69, and 83) are only installed on the branch pipelines, if the pressure reducing valve on a branch pipeline malfunctions, the safety valve on that branch will trip to release steam, and even the steam-using equipment on that branch may be unable to operate. Therefore, this application not only installs pressure reducing valves 56, 69, and 83 on the branch pipelines respectively, but also installs pressure reducing valve 34 on the main pipeline. When pressure reducing valve 56 malfunctions, the high-pressure steam generated by the second boiler 1 can be reduced to low-pressure steam by pressure reducing valve 24 and then used in the low-pressure steam-using equipment 66, preventing safety valves 58 and 60 from venting steam. Similarly, when pressure reducing valve 69 malfunctions, the high-pressure steam generated by the second boiler 1 can be reduced to low-pressure steam by pressure reducing valve 34 and then used in the air conditioning humidifier 79, preventing safety valves 71 and 73 from venting steam. Similarly, when pressure reducing valve 83 malfunctions, the high-pressure steam generated by the second boiler 1 can be reduced to low-pressure steam by pressure reducing valve 34 and then enter the second heater 120 to heat the softened water in the deoxygenated water tank 123, removing oxygen from the softened water in the deoxygenated water tank 123, and preventing safety valves 85 and 87 from venting steam. The deoxygenated softened water in the deoxygenated water tank 123 is supplied to the first boiler 8 via pipe 118 and the first input pipe, and to the second boiler 1 via pipe 118 and the fourth input pipe.

[0052] (2) When the total steam consumption of the plant is large and two or more boilers need to be started at the same time, the first boiler 8 operates at high pressure. The high-pressure steam generated by the first boiler 8 enters the first steam distribution cylinder 109. The steam in the first steam distribution cylinder 109 can be used by the high-pressure steam-using equipment 53 through the second output pipe. At this time, the second boiler 1 operates at low pressure. Valves 18, 35, 36, and 37 are all closed. The low-pressure steam generated by the second boiler 1 can directly enter the second steam distribution cylinder 107 through pipes 3, 21, and 24, and then through pipes 25 and 33. Steam generated by the second steam distributor 107 can enter the pressure reducing valve 56 via pipe 102 and the second input pipe, where it is reduced to low-pressure steam and then used in the low-pressure steam-using equipment 66. Steam generated by the second steam distributor 107 can also enter the pressure reducing valve 69 via pipe 103 and the fourth input pipe, where it is reduced to low-pressure steam and then used in the air conditioning humidifier 79. Steam generated by the second steam distributor 107 can also enter the pressure reducing valve 83 via the fifth input pipe, where it is reduced to low-pressure steam and then used in the second heater 120 to heat the softened water in the deoxygenated water tank 123, removing oxygen from the softened water. The deoxygenated softened water in the deoxygenated water tank 123 is then supplied to the first boiler 8 via pipe 118 and the first input pipe, and to the second boiler 1 via pipe 118 and the fourth input pipe.

[0053] At this time, the second boiler 1 operates at low pressure, which is more energy-efficient. Furthermore, pressure reducing valves 56, 69, and 83 do not need to frequently adjust the steam pressure from high to low, which helps protect the valve cores and springs, extending their service life. Even if the pressure reducing function of pressure reducing valves 56, 69, and 83 fails, the boiler 1 operates at low pressure and supplies low-pressure steam. Therefore, the failure of these valves will not affect the normal steam supply to low-pressure steam-using equipment. In addition, the failure of pressure reducing valves will not affect production. Furthermore, when pressure reducing valve 56 fails, it prevents safety valves 58 and 60 from tripping and releasing steam; similarly, when pressure reducing valve 69 fails, it prevents safety valves 71 and 73 from tripping and releasing steam; and similarly, when pressure reducing valve 83 fails, it prevents safety valves 85 and 87 from tripping and releasing steam, thus making the steam supply for production more stable and reliable.

[0054] The beneficial effects of this application are as follows:

[0055] 1. If the steam pressure rises, the ordinary safety valve will be activated first. The vent pipe of the ordinary safety valve is connected to the deaerator water tank. The steam released when the ordinary safety valve is activated can be used to heat the softened water. In this way, the released steam is not only recycled, but also prevents the special safety valve from venting the steam into the atmosphere through the vent pipe, which would not only waste heat energy but also pollute the environment.

[0056] 2. Based on the different steam pressures and uses of the equipment, this application proposes that one boiler operates at high pressure to supply high-pressure steam to equipment, while another boiler operates at low pressure to supply low-pressure steam to equipment, thereby reducing the operating pressure of some boilers and saving energy.

[0057] 3. This application utilizes the steam discharged from the deoxygenated water tank vent pipe for use in an air conditioning humidifier, or uses the excess steam discharged from the deoxygenated water tank vent pipe to heat the softened water in the soft water tank, so that energy is fully utilized.

[0058] 4. While utilizing waste heat to heat softened water, this application ensures that the oxygen content in the softened water is saturated, and excess oxygen overflows from the softened water tank without increasing the oxygen content. Therefore, this application not only prevents the safety valve from tripping, but also allows excess steam to be released and utilized when the system pressure rises, making the steam system safe, reliable, and energy-saving.

[0059] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A steam supply system, characterized in that, It includes the first boiler, the first steam distribution cylinder, high-pressure steam equipment, low-pressure steam equipment, and a deaerator; The first boiler is equipped with a first output pipe, a first input pipe, a first special safety valve, and a first ordinary safety valve. The opening pressure of the first special safety valve is greater than the opening pressure of the first ordinary safety valve. The first output pipe is connected to the input port of the first steam distributor. The second output pipe of the first steam distributor is connected to the high-pressure steam-using equipment. A second electric valve is provided on the second output pipe. A first pressure-reducing valve is provided on the third output pipe of the first steam distributor. The output end of the first pressure-reducing valve is connected to a second input pipe that is connected to the low-pressure steam-using equipment. A first electric valve is provided on the second input pipe. A water pump is installed at the outlet of the deoxygenated water tank. The output port of the water pump is connected to the first input pipeline. A first valve is installed on the first input pipeline. The vent pipe of the first special safety valve is open to the atmosphere. The vent pipe of the first ordinary safety valve is connected to the first heater inside the deoxygenated water tank through a third input pipeline. A second pressure reducing valve is installed on the third input pipeline.

2. The steam supply system according to claim 1, characterized in that, On the second input pipeline, a second special safety valve and a second ordinary safety valve are provided upstream of the first electric valve. The vent pipe of the second special safety valve is open to the atmosphere, and the vent pipe of the second ordinary safety valve is connected to the first heater in the deoxygenated water tank through the third input pipeline. The opening pressure of the second special safety valve is greater than the opening pressure of the second ordinary safety valve.

3. The steam supply system according to claim 1 or 2, characterized in that, On the second output pipe, upstream of the second electric valve, there is a third special safety valve and a third ordinary safety valve. The vent pipe of the third special safety valve is open to the atmosphere, and the vent pipe of the third ordinary safety valve is connected to the first heater in the deoxygenated water tank through the third input pipe. The opening pressure of the third special safety valve is greater than that of the third ordinary safety valve.

4. The steam supply system according to claim 1, characterized in that, The output end of the first pressure reducing valve is provided with a fourth input pipe connected to the air conditioner humidifier, and a third electric valve is provided on the fourth input pipe.

5. The steam supply system according to claim 4, characterized in that, On the fourth input pipeline, a fourth special safety valve and a fourth ordinary safety valve are provided upstream of the third electric valve. The vent pipe of the fourth special safety valve is open to the atmosphere, and the vent pipe of the fourth ordinary safety valve is connected to the first heater in the deoxygenated water tank through the third input pipeline. The opening pressure of the fourth special safety valve is greater than that of the fourth ordinary safety valve.

6. The steam supply system according to claim 1, characterized in that, It also includes a second boiler, which is equipped with a fourth output pipe, a fourth input pipe, a fifth special safety valve, and a fifth ordinary safety valve. The opening pressure of the fifth special safety valve is greater than that of the fifth ordinary safety valve. The fourth output pipe is equipped with a second valve, and the end of the fourth output pipe is connected to the input end of the first pressure reducing valve; the fourth input pipe is connected to the output port of the water pump, and the fourth input pipe is equipped with a third valve; the vent pipe of the fifth special safety valve is open to the atmosphere, and the vent pipe of the fifth ordinary safety valve is connected to the first heater in the deoxygenated water tank through the third input pipe.

7. The steam supply system according to claim 1, characterized in that, The first steam separator is equipped with a sixth special safety valve and a sixth ordinary safety valve. The opening pressure of the sixth special safety valve is greater than that of the sixth ordinary safety valve. The vent pipe of the sixth ordinary safety valve is connected to the first heater in the deaerator tank through the third input pipe.

8. The steam supply system according to claim 4, characterized in that, It also includes a second steam separator, the input port of which is connected to the third output pipe, the fifth output pipe of which is connected to the second input pipe, and the sixth output pipe of which is connected to the second heater in the deaerator tank through the fifth input pipe.

9. The steam supply system according to claim 8, characterized in that, The output end of the first pressure reducing valve is provided with a sixth input pipeline connected to the fifth input pipeline.

10. The steam supply system according to claim 8, characterized in that, The second steam cylinder is equipped with a seventh special safety valve and a seventh ordinary safety valve. The opening pressure of the seventh special safety valve is greater than that of the seventh ordinary safety valve. The vent pipe of the seventh ordinary safety valve is connected to the first heater in the deaerator tank through the third input pipe.

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