Oxygen comprehensive utilization system and control method

Abstract

The invention discloses an oxygen comprehensive utilization system and a control method, and belongs to the technical field of glass production lines. Comprising a first oxygen supply pipeline, the first oxygen supply pipeline is connected between a fractionating tower and a kiln and used for conveying first gas produced by the fractionating tower to the kiln, a pressure maintaining valve and a first node located on the output side of the pressure maintaining valve are arranged on the first oxygen supply pipeline, and the pressure maintaining valve is used for adjusting the pressure of the first gas; the oxygen storage tank is used for storing second gas generated after water electrolysis; and the second oxygen supply pipeline is connected between the oxygen storage tank and the first node and used for transmitting the second gas to the kiln, and a pressure reducing valve group is arranged on the second oxygen supply pipeline and used for adjusting the pressure of the second gas. The technical scheme has the beneficial effects that the stable pressure and flow of oxygen can be ensured, the waste of the oxygen is reduced, the oxygen generated by water electrolysis is fully utilized, and the purpose of saving energy is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of glass production lines, and in particular to an oxygen utilization system and a control method. Background Art

[0002] With the rapid development of my country's glass industry, the requirements for energy conservation are also increasing. Oxygen lances are becoming more and more common in glass factories. With this trend, the source of oxygen has become an important issue. At present, most float production lines use cryogenic air separation process to produce nitrogen and oxygen at the same time. Some float lines use water electrolysis to produce hydrogen. However, the by-product oxygen produced by this method is usually not used, but directly discharged, which makes it difficult to meet energy conservation requirements. Due to concerns about the difference in pressure between the two oxygens, and the relatively small amount of oxygen produced in the process of water electrolysis to produce hydrogen, and the unstable pressure, it will affect the oxygen pressure and flow of the main production line. Summary of the invention

[0003] The purpose of the present invention is to provide an oxygen comprehensive utilization system to solve the above technical problems;

[0004] The present invention also aims to provide a control method for an oxygen comprehensive utilization system to solve the above technical problems;

[0005] An oxygen comprehensive utilization system, comprising:

[0006] A first oxygen supply pipeline is connected between the fractionation tower and the kiln, and is used to transmit the first gas produced by the fractionation tower to the kiln. A pressure stabilizing valve and a first node located at the output side of the pressure stabilizing valve are provided on the first oxygen supply pipeline. The pressure stabilizing valve is used to adjust the pressure of the first gas.

[0007] An oxygen storage tank, used to store the second gas generated after water electrolysis;

[0008] The second oxygen supply pipeline is connected between the oxygen storage tank and the first node and is used to transmit the second gas to the kiln. A pressure reducing valve group is provided on the second oxygen supply pipeline and is used to adjust the pressure of the second gas.

[0009] Preferably, the pressure reducing valve group comprises:

[0010] A bypass valve is provided at the output side of the oxygen storage tank;

[0011] A first pressure reducing branch connected to both sides of the bypass valve, wherein the first pressure reducing branch comprises a first manual inspection valve, a first pressure reducing valve, a second manual inspection valve and a safety valve which are connected in sequence;

[0012] A second pressure reducing branch is connected to both sides of the bypass valve, and the second pressure reducing branch includes a third manual service valve, a second pressure reducing valve and a fourth manual service valve which are connected in sequence, an input end of the third manual service valve is connected to an input end of the first pressure reducing branch, and an output end of the fourth manual service valve is connected to an output end of the first pressure reducing branch.

[0013] Preferably, the second oxygen supply pipeline is further provided with a first automatic valve, which is arranged between the oxygen storage tank and the pressure reducing valve group.

[0014] Preferably, the second oxygen supply pipeline is further provided with:

[0015] A first remote pressure transmitter, arranged at the output side of the pressure reducing valve group;

[0016] A first flow remote transmitter, provided at the output side of the first pressure remote transmitter;

[0017] A check valve is provided between the first flow remote transmitter and the first node.

[0018] Preferably, it also includes a maintenance pipeline, the input end of which is connected between the first automatic valve and the pressure reducing valve group, and the maintenance pipeline includes a fifth manual maintenance valve and a second automatic valve connected in sequence.

[0019] Preferably, the first oxygen supply pipeline is further provided with:

[0020] A second remote pressure transmitter is provided at the output side of the fractionation tower;

[0021] A second flow remote transmitter, provided at the output side of the second pressure remote transmitter;

[0022] The third automatic valve is arranged between the second flow remote transmitter and the pressure stabilizing valve.

[0023] Preferably, the first oxygen supply pipeline is further provided with:

[0024] a sixth manual inspection valve, disposed between the third automatic valve and the pressure-stabilizing valve;

[0025] a seventh manual inspection valve, provided on the output side of the pressure stabilizing valve;

[0026] a buffer tank, disposed between the seventh manual inspection valve and the first node;

[0027] An eighth manual service valve, wherein the input end of the eighth manual service valve is connected to the input end of the sixth manual service valve, and the output end of the eighth manual service valve is connected to the output end of the seventh manual service valve.

[0028] Preferably, the first oxygen supply pipeline is further provided with:

[0029] A third remote pressure transmitter is provided between the first node and the kiln;

[0030] The third flow remote transmitter is arranged between the third pressure remote transmitter and the kiln.

[0031] A control method for an oxygen comprehensive utilization system, used for controlling the oxygen comprehensive utilization system, comprises an oxygen consumption control method and a pressure control method, wherein the oxygen consumption control method comprises:

[0032] Step S0, setting a preset oxygen consumption of the kiln;

[0033] Step S1, if the oxygen detection value in the kiln is greater than the preset oxygen consumption, then execute step A; if the oxygen detection value is less than the preset oxygen consumption, then execute step B; if the oxygen detection value is equal to the preset oxygen consumption, then execute step C;

[0034] Step A, determining whether the second gas is flowing in the second oxygen supply pipeline, if yes, reducing the opening of the first automatic valve and returning to step S1, if no, increasing the opening of the third automatic valve and returning to step S1;

[0035] Step B, determining whether the third automatic valve is open, if yes, reducing the opening of the third automatic valve and returning to step S1; if no, increasing the opening of the first automatic valve and returning to step S1;

[0036] Step C, maintaining the openings of the first automatic valve and the third automatic valve unchanged.

[0037] Preferably, the pressure control method comprises:

[0038] Step G0, setting a preset pressure value when reaching the kiln;

[0039] Step G1, controlling the openings of the pressure stabilizing valve and the pressure reducing valve group according to the preset pressure value until the first gas and the second gas reach the preset pressure value within a first time period.

[0040] The beneficial effects of the present invention are as follows: by adopting the above technical scheme, the pressure and flow rate of oxygen can be kept stable, the waste of oxygen can be reduced, the oxygen generated by water electrolysis can be fully utilized, and the purpose of energy saving can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of the oxygen comprehensive utilization system of the present invention;

[0042] Figure 2 It is a step diagram of the oxygen consumption control method of the oxygen comprehensive utilization system of the present invention;

[0043] Figure 3 It is a step diagram of the pressure control method of the oxygen comprehensive utilization system of the present invention;

[0044] Figure 4 is a flow chart of a method for controlling system oxygen consumption according to an embodiment of the present invention;

[0045] Figure 5 It is a flow chart of a system pressure control method according to an embodiment of the present invention.

[0046] In the attached figure: 1, first oxygen supply pipeline; 11, second pressure remote transmitter; 12, second flow remote transmitter; 13, sixth manual inspection valve; 14, seventh manual inspection valve; 15, buffer tank; 16, third automatic valve; 17, eighth manual inspection valve; 18, third pressure remote transmitter; 19, third flow remote transmitter; 2, fractionation tower; 3, kiln; 4, pressure regulating valve; 5, oxygen storage tank; 6, second oxygen supply pipeline; 61, first automatic valve; 62, first pressure remote transmitter; 6 3. First flow remote transmitter; 64. Check valve; 7. Pressure reducing valve group; 71. Bypass valve; 72. First pressure reducing branch; 721. First manual inspection valve; 722. First pressure reducing valve; 723. Second manual inspection valve; 73. Safety valve; 74. Second pressure reducing branch; 741. Third manual inspection valve; 742. Second pressure reducing valve; 743. Fourth manual inspection valve; 8. Inspection pipeline; 81. Fifth manual inspection valve; 82. Second automatic valve; M, first node. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0049] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0050] An oxygen comprehensive utilization system, such as Figure 1 As shown, including,

[0051] The first oxygen supply pipeline 1 is connected between the fractionation tower 2 and the kiln 3 and is used to transmit the first gas produced by the fractionation tower 2 to the kiln 3. The first oxygen supply pipeline 1 is provided with a pressure-stabilizing valve 4 and a first node M located at the output side of the pressure-stabilizing valve 4. The pressure-stabilizing valve 4 is used to adjust the pressure of the first gas;

[0052] An oxygen storage tank 5, used for storing the second gas generated after water electrolysis;

[0053] The second oxygen supply pipeline 6 is connected between the oxygen storage tank 5 and the first node M, and is used to transmit the second gas to the kiln 3. The second oxygen supply pipeline 6 is provided with a pressure reducing valve group 7, and the pressure reducing valve group 7 is used to adjust the pressure of the second gas.

[0054] Specifically, the present invention provides an oxygen comprehensive utilization system. The float glass production line is equipped with three sets of cryogenic air separation devices, which can produce 2450Nm 3 / h, the nitrogen outlet pressure is 0.23MPa(G). In order to meet the oxygen lance requirements of kiln 3, an oxygen tower is added to fractionation tower 2. Fractionation tower 2 can produce 400Nm of oxygen at the same time. 3 / h, the oxygen outlet pressure is 0.15MPa(G), and the oxygen outlet concentration is ≥93%.

[0055] At the same time, there are three sets of water electrolysis hydrogen production devices, producing 200Nm 3 / h, while producing 100Nm 3 / h. The first gas and the second gas are both oxygen. The first gas is produced by the distillation tower 2, and the second gas is obtained by water electrolysis reaction and stored in the oxygen storage tank 5. The oxygen required by the kiln 3 is mainly provided by the distillation tower 2, and the rest is provided by the oxygen storage tank 5.

[0056] Most water electrolysis hydrogen production stations have a peak-valley electricity operation mechanism for energy conservation, that is, they operate at full load at night when electricity prices are low, and do not operate or operate at low load when electricity prices are high during the day. In general, the oxygen outlet pressure of the electrolyzer is 1.6MPa. Therefore, this system is equipped with a large-volume oxygen storage tank 5, and a set of pressure reducing valve group 7 is arranged on the output side of the oxygen storage tank 5 to adjust the pressure.

[0057] The distillation tower 2 of the nitrogen station must run stably for a long time, so the oxygen coming out of the distillation tower is relatively stable and has a low pressure, generally only 0.15MPa. In order to further stabilize the pressure, a set of pressure regulating valves 4 is set on the output side of the distillation tower 2. It can ensure the stability of the pressure and flow of oxygen, make full use of the oxygen generated by water electrolysis, and achieve the purpose of energy saving.

[0058] In a preferred embodiment, the pressure reducing valve group 7 includes:

[0059] A bypass valve 71 is provided at the output side of the oxygen storage tank 5;

[0060] The first pressure reducing branch 72 is connected to both sides of the bypass valve 71. The first pressure reducing branch 72 includes a first manual inspection valve 721, a first pressure reducing valve 722, a second manual inspection valve 723 and a safety valve 73 which are connected in sequence;

[0061] The second pressure reducing branch 74 is connected to both sides of the bypass valve 71. The second pressure reducing branch 74 includes a third manual service valve 741, a second pressure reducing valve 742 and a fourth manual service valve 743 which are connected in sequence. The input end of the third manual service valve 741 is connected to the input end of the first pressure reducing branch 72, and the output end of the fourth manual service valve 743 is connected to the output end of the first pressure reducing branch 72.

[0062] Specifically, one end of the safety valve 73 is connected to the output side of the second manual inspection valve 723 , and the other end of the safety valve 73 is connected to the atmosphere.

[0063] In a preferred embodiment, the second oxygen supply pipeline 6 is further provided with a first automatic valve 61 , which is arranged between the oxygen storage tank 5 and the pressure reducing valve group 7 .

[0064] Specifically, the first automatic valve 61 is used to adjust the oxygen flow rate in the second oxygen supply pipeline 6 .

[0065] In a preferred embodiment, the second oxygen supply pipeline 6 is further provided with:

[0066] A first remote pressure transmitter 62 is provided at the output side of the pressure reducing valve group 7;

[0067] The first flow remote transmitter 63 is provided at the output side of the first pressure remote transmitter 62;

[0068] The check valve 64 is provided between the first flow remote transmitter 63 and the first node M.

[0069] Specifically, the first pressure remote transmitter 62 is used to monitor the oxygen pressure output by the second oxygen supply pipeline 6 , and the first flow remote transmitter 63 is used to monitor the oxygen flow output by the second oxygen supply pipeline 6 .

[0070] In a preferred embodiment, it also includes a maintenance pipeline 8, the input end of the maintenance pipeline 8 is connected between the first automatic valve 61 and the pressure reducing valve group 7, and the maintenance pipeline 8 includes a fifth manual maintenance valve 81 and a second automatic valve 82 connected in sequence.

[0071] Specifically, one end of the second automatic valve 82 is connected to the fifth manual inspection valve 81 , and the other end of the second automatic valve 82 is connected to the atmosphere.

[0072] In a preferred embodiment, the first oxygen supply pipeline 1 is further provided with:

[0073] The second pressure remote transmitter 11 is provided at the output side of the fractionation tower 2;

[0074] The second flow remote transmitter 12 is provided at the output side of the second pressure remote transmitter 11;

[0075] The third automatic valve 16 is arranged between the second flow remote transmitter 12 and the pressure regulating valve 4 .

[0076] Specifically, the second pressure remote transmitter 11 is used to monitor the oxygen pressure output by the distillation tower 2 , the second flow remote transmitter 12 is used to monitor the oxygen flow output by the distillation tower 2 , and the third automatic valve 16 is used to control the oxygen flow of the first oxygen supply pipeline 1 .

[0077] In a preferred embodiment, the first oxygen supply pipeline 1 is further provided with:

[0078] The sixth manual inspection valve 13 is provided between the third automatic valve 16 and the pressure regulating valve 4;

[0079] A seventh manual inspection valve 14 is provided on the output side of the pressure regulating valve 4;

[0080] A buffer tank 15 is provided between the seventh manual inspection valve 14 and the first node M;

[0081] The eighth manual check valve 17 has an input end connected to the input end of the sixth manual check valve 13 , and an output end connected to the output end of the seventh manual check valve 14 .

[0082] Specifically, the pressure stabilizing valve 4 and the buffer tank 15 form a set of pressure stabilizing mechanisms for stabilizing the gas pressure output by the distillation tower 2 .

[0083] In a preferred embodiment, the first oxygen supply pipeline 1 is further provided with:

[0084] The third pressure remote transmitter 18 is provided between the first node M and the kiln 3;

[0085] The third flow rate remote transmitter 19 is arranged between the third pressure remote transmitter 18 and the kiln 3 .

[0086] Specifically, the third pressure remote transmitter 18 is used to monitor the pressure when it reaches the kiln 3 , and the third flow remote transmitter 19 is used to monitor the oxygen flow when it reaches the kiln 3 .

[0087] A control method for an oxygen comprehensive utilization system, referring to Figure 2 , used to control the comprehensive oxygen utilization system, including an oxygen consumption control method and a pressure control method,

[0088] Oxygen control methods include:

[0089] Step S0, setting the preset oxygen consumption of the kiln 3;

[0090] Step S1, if the oxygen detection value in the kiln 3 is greater than the preset oxygen consumption, then execute step A; if the oxygen detection value is less than the preset oxygen consumption, then execute step B; if the oxygen detection value is equal to the preset oxygen consumption, then execute step C;

[0091] Step A, determining whether the second gas is flowing in the second oxygen supply pipeline 6, if yes, reducing the opening of the first automatic valve 61 and returning to step S1, if no, increasing the opening of the third automatic valve 16 and returning to step S1;

[0092] Step B, determining whether the third automatic valve 16 is open, if yes, reducing the opening of the third automatic valve 16 and returning to step S1; if no, increasing the opening of the first automatic valve 61 and returning to step S1;

[0093] Step C: maintaining the openings of the first automatic valve 61 and the third automatic valve 16 unchanged.

[0094] Specifically, the preset oxygen consumption can be set by the user in advance, or can be adjusted according to the actual situation. When the kiln 3 needs to adjust the oxygen consumption, the opening of the automatic valve is controlled by the above control system and related instrument data to achieve the effect of stabilizing the oxygen flow rate. Not only can the utilization rate of oxygen be increased, but also the combustion efficiency of the kiln 3 can be increased, and the output of glass can be increased.

[0095] Reference Figure 4 , compare the oxygen detection value in the kiln 3 with the preset oxygen consumption. If the oxygen detection value is greater than the preset oxygen consumption, continue to judge whether the value of the first flow remote transmitter 63 is zero, that is, whether there is a second gas flowing in the second oxygen supply pipeline 6. If the value of the first flow remote transmitter 63 is zero, increase the opening of the third automatic valve 16 and continue to compare. If the value of the first flow remote transmitter 63 is not zero, reduce the opening of the first automatic valve 61 and continue to compare.

[0096] If the oxygen detection value is less than the preset oxygen consumption, continue to determine whether the opening of the third automatic valve 16 is zero. If so, increase the opening of the first automatic valve 61 and continue to compare. If not, reduce the opening of the third automatic valve 16 and continue to compare.

[0097] If the oxygen detection value is equal to the preset oxygen consumption, the opening degrees of the first automatic valve 61 and the third automatic valve 16 are maintained unchanged.

[0098] The opening degrees of the first automatic valve 61, the second automatic valve 82, and the third automatic valve 16 are 0-100%, and when the opening degree is 0, it means that the automatic valve is closed.

[0099] Reference Figure 3 , pressure control methods include,

[0100] Step G0, setting a preset pressure value when reaching the kiln 3;

[0101] Step G1, controlling the openings of the pressure stabilizing valve 4 and the pressure reducing valve group 7 according to a preset pressure value, until the first gas and the second gas reach a preset pressure value within a first time period.

[0102] Specifically, the preset pressure value can be set in advance by the user, or can be set according to the actual needs of the kiln 3. The pressure is mainly controlled by the pressure reducing valve group 7 and the pressure stabilizing valve 4. When the valve group cannot be adjusted, it is controlled by the venting valve. In actual operation, because the oxygen consumption is generally large, venting rarely occurs.

[0103] Reference Figure 5 , pre-set the preset pressure value when arriving at the kiln 3, determine whether the third pressure remote transmitter 18 and the first pressure remote transmitter 62 can reach the preset pressure value within the first time period, if not, reset the pressure value and flow value when arriving at the kiln 3, if yes, it means that the system has reached the preset pressure value.

[0104] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An oxygen comprehensive utilization system, characterized in that: include, A first oxygen supply pipeline is connected between the fractionation tower and the kiln, and is used to transmit the first gas produced by the fractionation tower to the kiln. A pressure stabilizing valve and a first node located at the output side of the pressure stabilizing valve are provided on the first oxygen supply pipeline. The pressure stabilizing valve is used to adjust the pressure of the first gas. An oxygen storage tank, used to store the second gas generated after water electrolysis; The second oxygen supply pipeline is connected between the oxygen storage tank and the first node and is used to transmit the second gas to the kiln. A pressure reducing valve group is provided on the second oxygen supply pipeline and is used to adjust the pressure of the second gas.

2. The oxygen comprehensive utilization system according to claim 1, characterized in that: The pressure reducing valve group comprises: A bypass valve is provided at the output side of the oxygen storage tank; A first pressure reducing branch connected to both sides of the bypass valve, wherein the first pressure reducing branch comprises a first manual inspection valve, a first pressure reducing valve, a second manual inspection valve and a safety valve which are connected in sequence; A second pressure reducing branch is connected to both sides of the bypass valve, and the second pressure reducing branch includes a third manual service valve, a second pressure reducing valve and a fourth manual service valve which are connected in sequence, an input end of the third manual service valve is connected to an input end of the first pressure reducing branch, and an output end of the fourth manual service valve is connected to an output end of the first pressure reducing branch.

3. The oxygen comprehensive utilization system according to claim 1, characterized in that: The second oxygen supply pipeline is also provided with a first automatic valve, which is arranged between the oxygen storage tank and the pressure reducing valve group.

4. The oxygen comprehensive utilization system according to claim 3, characterized in that: The second oxygen supply pipeline is also provided with: A first remote pressure transmitter, arranged at the output side of the pressure reducing valve group; A first flow remote transmitter, provided at the output side of the first pressure remote transmitter; A check valve is provided between the first flow remote transmitter and the first node.

5. The oxygen comprehensive utilization system according to claim 3, characterized in that: It also includes a maintenance pipeline, the input end of which is connected between the first automatic valve and the pressure reducing valve group, and the maintenance pipeline includes a fifth manual maintenance valve and a second automatic valve connected in sequence.

6. The oxygen comprehensive utilization system according to claim 1, characterized in that: The first oxygen supply pipeline is also provided with: A second remote pressure transmitter is provided at the output side of the fractionation tower; A second flow remote transmitter, provided at the output side of the second pressure remote transmitter; The third automatic valve is arranged between the second flow remote transmitter and the pressure stabilizing valve.

7. The oxygen comprehensive utilization system according to claim 6, characterized in that: The first oxygen supply pipeline is also provided with: a sixth manual inspection valve, disposed between the third automatic valve and the pressure-stabilizing valve; a seventh manual inspection valve, provided on the output side of the pressure stabilizing valve; a buffer tank, disposed between the seventh manual inspection valve and the first node; An eighth manual service valve, wherein the input end of the eighth manual service valve is connected to the input end of the sixth manual service valve, and the output end of the eighth manual service valve is connected to the output end of the seventh manual service valve.

8. The oxygen comprehensive utilization system according to claim 7, characterized in that: The first oxygen supply pipeline is also provided with: A third remote pressure transmitter is provided between the first node and the kiln; The third flow remote transmitter is arranged between the third pressure remote transmitter and the kiln.

9. A control method for an oxygen comprehensive utilization system, characterized in that: Used to control the oxygen comprehensive utilization system according to any one of claims 1 to 8, including an oxygen consumption control method and a pressure control method, wherein the oxygen consumption control method includes: Step S0, setting a preset oxygen consumption of the kiln; Step S1, if the oxygen detection value in the kiln is greater than the preset oxygen consumption, then execute step A; if the oxygen detection value is less than the preset oxygen consumption, then execute step B; if the oxygen detection value is equal to the preset oxygen consumption, then execute step C; Step A, determining whether the second gas is flowing in the second oxygen supply pipeline, if yes, reducing the opening of the first automatic valve and returning to step S1, if no, increasing the opening of the third automatic valve and returning to step S1; Step B, determining whether the third automatic valve is open, if yes, reducing the opening of the third automatic valve and returning to step S1; if no, increasing the opening of the first automatic valve and returning to step S1; Step C, maintaining the openings of the first automatic valve and the third automatic valve unchanged.

10. The control method of the oxygen comprehensive utilization system according to claim 9, characterized in that: The pressure control method comprises: Step G0, setting a preset pressure value when reaching the kiln; Step G1, controlling the openings of the pressure stabilizing valve and the pressure reducing valve group according to the preset pressure value until the first gas and the second gas reach the preset pressure value within a first time period.

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