Desulfurization wastewater treatment system

Abstract

The utility model discloses a desulfurization wastewater treatment system, which comprises a plurality of effector units, a reflux valve and a live steam valve, the effector units are connected in sequence; the live steam inlet of the first effector unit is provided with a live steam valve; the desulfurization wastewater outlet of the last effector unit is provided with a reflux valve, and the desulfurization wastewater outlet of the last effector unit is connected with the desulfurization wastewater inlet of the first effector unit through the reflux valve; the live steam valve is configured to act according to the live steam valve control instruction.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of automated equipment, and particularly to a desulfurized wastewater treatment system. Background Art

[0002] The multi-effect evaporation technology is a new treatment method for desulfurized wastewater, aiming to improve the treatment effect of high-salt wastewater, reduce the treatment cost, and reduce environmental pollution. Compared with the traditional treatment methods, the multi-effect evaporation technology has the advantages of good treatment effect, low energy consumption, small equipment floor area, etc., so it has a wide application prospect in the field of desulfurized wastewater treatment. The multi-effect evaporation technology uses the evaporation principle to separate the solutes in water. This process uses multiple effectors, and by gradually increasing the temperature and decreasing the pressure, the solutes in water are gradually separated. During the multi-effect evaporation process, the secondary steam generated in the previous effect has a higher temperature and pressure and contains a large amount of latent heat. This part of the heat can be transferred to the heating medium of the next effect through a heat exchanger. The secondary steam of the previous effect is used as the heating medium of the next effect, thereby realizing the recovery and utilization of heat.

[0003] The existing multi-effect evaporation desulfurized wastewater treatment system has the following defects: when the parameters of the heating steam change frequently with the fluctuation of the unit load, it is difficult to effectively control the concentration of the desulfurized wastewater after treatment. Summary of the Utility Model

[0004] The present utility model provides a desulfurized wastewater treatment system to achieve the purpose of ensuring that the treatment concentration of the desulfurized wastewater can be within a preset concentration range when the parameters of the heating steam change.

[0005] The embodiments of the present utility model provide a desulfurized wastewater treatment system, including:

[0006] Multiple effector units, further including a reflux valve and a live steam valve;

[0007] The effector units are connected in sequence;

[0008] The live steam inlet of the first effector unit is configured with the live steam valve;

[0009] The desulfurized wastewater outlet of the last effector unit is configured with the reflux valve, and the desulfurized wastewater outlet of the last effector unit is connected to the desulfurized wastewater inlet of the first effector unit through the reflux valve;

[0010] The live steam valve is configured to act according to a live steam valve control instruction.

[0011] Optionally, it further includes:

[0012] The first flow sensor, the second flow sensor, the third flow sensor, the first densitometer, the second densitometer, and the pressure sensor;

[0013] The live steam inlet of the first effector unit is configured with the first flow sensor and the pressure sensor, and the desulfurized wastewater inlet of the first effector unit is configured with the second flow sensor and the first densitometer;

[0014] The desulfurized wastewater outlet of the last effector unit is configured with the third flow sensor and the second densitometer;

[0015] The first flow sensor, the second flow sensor, and the third flow sensor are respectively used to measure the live steam input amount, the desulfurized wastewater inlet flow rate, and the desulfurized wastewater return port flow rate;

[0016] The first densitometer and the second densitometer are respectively used to measure the desulfurized wastewater inlet concentration and the desulfurized wastewater return port concentration;

[0017] The pressure sensor is used to measure the live steam pressure;

[0018] The desulfurized wastewater inlet flow rate and the desulfurized wastewater return port flow rate are used to determine the desulfurized wastewater flow rate, and the desulfurized wastewater inlet concentration and the desulfurized wastewater return concentration are used to determine the initial desulfurized wastewater concentration;

[0019] The desulfurized wastewater flow rate, the initial desulfurized wastewater concentration, the live steam pressure, and the desulfurized wastewater treatment target concentration are used to determine the live steam consumption;

[0020] The live steam consumption is used to generate the live steam valve control instruction, and the live steam valve control instruction is used to adjust the live steam input amount to be the same as the live steam consumption.

[0021] Optionally, it further includes a condenser, and the steam outlet of the last-effect effector unit is connected to the condenser.

[0022] Optionally, it further includes a desulfurized wastewater inlet valve;

[0023] The desulfurized wastewater inlet of the first effector unit is configured with the desulfurized wastewater inlet valve.

[0024] Optionally, the effector unit includes a flash separator, a heat exchanger, and a circulation pump;

[0025] The flash separator, the heat exchanger, and the circulation pump are connected in series to form a desulfurized wastewater circulation loop;

[0026] The heat exchanger is configured with a steam inlet, and the flash separator is configured with a desulfurized wastewater inlet, a desulfurized wastewater outlet, and a steam outlet;

[0027] The steam inlet of the first-effect heat exchanger serves as the live steam inlet;

[0028] The desulfurized wastewater outlet of the flash separator in the previous effect is connected to the desulfurized wastewater inlet pipeline of the flash separator in the next effect;

[0029] The steam outlet of the flash separator in the previous effect is connected to the steam inlet pipeline of the heat exchanger in the next effect.

[0030] Optionally, a level gauge is further arranged on the flash separator;

[0031] The level gauge is used to measure the liquid level of the desulfurized wastewater in the flash separator.

[0032] Optionally, a number of flash separator valves are further included;

[0033] The desulfurized wastewater outlet of the flash separator in the previous effect is connected to the desulfurized wastewater inlet pipeline of the flash separator in the next effect through one of the flash separator valves.

[0034] Optionally, a third densitometer is further arranged on the flash separator;

[0035] The third densitometer is used to measure the density of the desulfurized wastewater in the flash separator.

[0036] Optionally, the flash separators from the second effect to the penultimate effect are further equipped with a fourth flow sensor and a fourth densitometer;

[0037] The fourth flow sensor and the fourth densitometer are arranged on the pipeline from the desulfurized wastewater outlet of the flash separator in the previous effect to the desulfurized wastewater inlet of the flash separator in the next effect.

[0038] Optionally, three of the effector units are included.

[0039] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model provides a desulfurized wastewater treatment system, which includes multiple effector units, a reflux valve, and a live steam valve. Among them, the desulfurized wastewater outlet of the last effector unit is configured with a reflux valve, and the desulfurized wastewater outlet of the last effector unit is connected to the desulfurized wastewater inlet of the first effector unit through the reflux valve. Based on the reflux valve, when the concentration of the concentrated water does not meet the set value range, the concentrated water can return to the first effector unit through the reflux valve for further concentration. When the concentration meets the set value range, the concentrated water is discharged from the system, thereby ensuring that the discharged concentrated water is always within the set concentration range and guaranteeing the treatment effect of the desulfurized wastewater. In addition, the system is also equipped with a live steam valve. When the parameters of the heating steam change frequently with the fluctuation of the unit load, the opening degree of the live steam valve can be adjusted to stabilize the input flow of the live steam within a certain deviation range to meet the treatment requirements of the desulfurized wastewater, thereby ensuring the treatment effect of the desulfurized wastewater from another perspective. Description of the Drawings

[0040] Figure 1 is the structural block diagram of the desulfurized wastewater treatment system in the embodiment;

[0041] Figure 2 is another structural block diagram of the desulfurized wastewater treatment system in the embodiment;

[0042] Figure 3 is the structural block diagram of the effector unit in the embodiment;

[0043] Figure 4 is the structural schematic diagram of the desulfurized wastewater treatment system in the embodiment. Detailed Embodiments

[0044] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings, rather than all the structures.

[0045] Figure 1 is the structural block diagram of the desulfurized wastewater treatment system in the embodiment. Refer to Figure 1 , the desulfurized wastewater treatment system includes: multiple effector units (effector units 1 to n), and also includes a reflux valve 1 and a live steam valve 2;

[0046] The effector units (effector units 1 to n) are connected in sequence;

[0047] The live steam inlet of the first effector unit (effector unit 1) is configured with a live steam valve 2;

[0048] The desulfurized wastewater outlet of the last effector unit (effector unit n) is configured with a reflux valve 1, and the desulfurized wastewater outlet of the last effector unit (effector unit n) is connected to the desulfurized wastewater inlet of the first effector unit (effector unit 1) through the reflux valve 1;

[0049] The live steam valve 2 is configured to act according to the live steam valve control instruction.

[0050] In this embodiment, the effector unit is used to realize the concentration treatment of desulfurized wastewater. Among them, the specific structure of the effector unit is not limited. For example, the effector unit can realize the treatment of desulfurized wastewater by evaporating desulfurized wastewater.

[0051] In this embodiment, the live steam valve 2 is specifically used to adjust the flow rate of the live steam entering the effector unit of the first effect. Among them, the live steam valve control instruction can be generated manually to realize the control of the live steam valve manually.

[0052] In the embodiment, the reflux valve 1 is specifically used to enable the desulfurized wastewater (concentrated water) output by the effector unit of the last effect to flow back into the effector unit of the first effect, so that when the concentration of the finally output desulfurized wastewater (concentrated water) does not reach the expectation, the concentrated water is treated again by the effector units (1 - n) until the concentration of the finally output desulfurized wastewater reaches the expectation (concentration).

[0053] In this embodiment, the desulfurized wastewater treatment system is a multi-effect system, and the working process of the desulfurized wastewater treatment system can be as follows:

[0054] The live steam enters the effector unit 1 through the live steam valve 2 and the hot steam pipeline. The live steam is used as the evaporation heat source to preheat the desulfurized wastewater, and the preheated desulfurized wastewater enters the effector unit 1 for concentration;

[0055] The secondary steam generated by the effector unit 1 enters the effector unit 2 through the steam pipeline at its top, serving as the heat source for the effector unit of the second effect. The desulfurized wastewater concentrated by the effector unit 1 enters the effector unit 2 for further concentration;

[0056] And so on, the desulfurized wastewater concentrated by the effector unit n - 1 enters the effector unit n for further concentration;

[0057] When the concentration of the concentrated water formed after concentration by the effector unit n meets the expectation, the concentrated water is discharged. Otherwise, the concentrated water is returned to the effector unit 1 through the reflux valve 1 and the reflux pipeline, and the concentrated water is concentrated again by the effector units 1 - n here.

[0058] This embodiment provides a desulfurized wastewater treatment system, which includes multiple effector units, a reflux valve, and a live steam valve. Among them, the desulfurized wastewater outlet of the last effector unit is configured with a reflux valve, and the desulfurized wastewater outlet of the last effector unit is connected to the desulfurized wastewater inlet of the first effector unit through the reflux valve. Based on the reflux valve, when the concentration of the thick water does not meet the set value range, the thick water can return to the first-effect effector unit through the reflux valve for further concentration. When the concentration meets the set value range, the thick water is discharged from the system, thereby ensuring that the discharged thick water is always within the set concentration range and guaranteeing the treatment effect of the desulfurized wastewater. In addition, the system is also configured with a live steam valve. When the parameters of the heating steam change frequently with the fluctuation of the unit load, the opening of the live steam valve can be adjusted to stabilize the input flow rate of the live steam within a certain deviation range to meet the treatment requirements of the desulfurized wastewater, thereby ensuring the treatment effect of the desulfurized wastewater from another perspective.

[0059] Figure 2 It is the structural block diagram of another desulfurized wastewater treatment system in the embodiment. Refer to Figure 2 , in Figure 1 Based on the scheme shown, in an implementable solution, the desulfurized wastewater treatment system is characterized by further comprising:

[0060] A first flow sensor 3, a second flow sensor 4, a third flow sensor 5, a first densitometer 6, a second densitometer 7, and a pressure sensor 8;

[0061] The live steam inlet of the first effector unit is configured with a first flow sensor 3 and a pressure sensor 8, and the desulfurized wastewater inlet of the first effector unit is configured with a second flow sensor 4 and a first densitometer 6;

[0062] The desulfurized wastewater outlet of the last effector unit is configured with a third flow sensor 5 and a second densitometer 7;

[0063] The first flow sensor 3, the second flow sensor 4, and the third flow sensor 5 are respectively used to measure the input amount of live steam, the desulfurized wastewater inlet flow rate, and the desulfurized wastewater reflux port flow rate;

[0064] The first densitometer 6 and the second densitometer 7 are respectively used to measure the desulfurized wastewater inlet concentration and the desulfurized wastewater reflux port concentration;

[0065] The pressure sensor 8 is used to measure the live steam pressure;

[0066] The desulfurized wastewater inlet flow rate and the desulfurized wastewater reflux port flow rate are used to determine the desulfurized wastewater flow rate, and the desulfurized wastewater inlet concentration and the desulfurized wastewater reflux concentration are used to determine the initial concentration of the desulfurized wastewater;

[0067] The desulfurized wastewater flow rate, the initial concentration of the desulfurized wastewater, and the live steam pressure determine the consumption of live steam, and the target concentration of the desulfurized wastewater treatment is used to determine the consumption of live steam;

[0068] The consumption of live steam is used to generate a live steam valve control instruction, and the live steam valve control instruction is used to adjust the input amount of live steam to be the same as the consumption of live steam.

[0069] In this solution, the set desulfurized wastewater inlet flow rate is the measured flow rate of the (desulfurized wastewater) at the desulfurized wastewater input port of the effector unit 1;

[0070] The set desulfurized wastewater return port flow rate is the measured flow rate of the (concentrated water) at the desulfurized wastewater output port of the effector unit n (the output port in the system for finally discharging the concentrated water).

[0071] In this solution, the desulfurized wastewater flow rate is the sum of the desulfurized wastewater inlet flow rate and the desulfurized wastewater return port flow rate.

[0072] In this solution, the set desulfurized wastewater inlet concentration is the measured concentration of the (desulfurized wastewater) at the desulfurized wastewater input port of the effector unit 1;

[0073] The set desulfurized wastewater return port concentration is the measured concentration of the (concentrated water) at the desulfurized wastewater output port of the effector unit n (the output port in the system for finally discharging the concentrated water).

[0074] In this solution, the initial concentration of the desulfurized wastewater is the sum of the desulfurized wastewater inlet concentration and the desulfurized wastewater return port concentration.

[0075] In this solution, the set live steam pressure refers to the pressure of the steam input from an external device (such as a boiler) to the desulfurized wastewater treatment system.

[0076] Exemplarily, in this solution, an operator can monitor the working state of the desulfurized wastewater treatment system through parameters such as the desulfurized wastewater flow rate, the initial concentration of the desulfurized wastewater, and the live steam pressure. When any of the above parameters is abnormal, the operator adjusts the desulfurized wastewater treatment system.

[0077] Exemplarily, in this solution, an operator can calculate the consumption of live steam based on the desulfurized wastewater flow rate, the initial concentration of the desulfurized wastewater, the live steam pressure, and the target concentration of the desulfurized wastewater treatment, and then generate a live steam valve control instruction;

[0078] By manually inputting the live steam valve control instruction to the live steam valve, the live steam valve is actuated, and then the input amount of live steam is made the same as the consumption of live steam.

[0079] Exemplarily, in this solution, the consumption of live steam is the input flow rate of live steam required to meet the target concentration of desulfurized wastewater treatment under the conditions of the current live steam pressure, desulfurized wastewater flow rate, and initial concentration of desulfurized wastewater.

[0080] Based on any of the foregoing solutions, in an implementable solution, the desulfurized wastewater treatment system further includes a condenser, and the steam outlet of the effector unit of the last effect is connected to the condenser.

[0081] In this solution, the condenser is used to condense the unutilized secondary steam of the effector unit of the last effect. The unutilized secondary steam enters the condenser and is cooled into condensed water, which can be recycled.

[0082] Based on any of the foregoing solutions, in an implementable solution, the desulfurized wastewater treatment system further includes a desulfurized wastewater inlet valve;

[0083] The desulfurized wastewater inlet of the first effector unit is configured with a desulfurized wastewater inlet valve.

[0084] In this solution, the desulfurized wastewater inlet valve is used to adjust the flow rate of the desulfurized wastewater entering the first effector unit.

[0085] Figure 3 It is the structural block diagram of the effector unit in the embodiment. Refer to Figure 3 , based on any of the foregoing solutions, in an implementable solution, the effector unit includes a flash separator, a heat exchanger, and a circulation pump;

[0086] The flash separator, the heat exchanger, and the circulation pump are connected in series to form a desulfurized wastewater circulation loop;

[0087] The heat exchanger is configured with a steam inlet, and the flash separator is configured with a desulfurized wastewater inlet, a desulfurized wastewater outlet, and a steam outlet;

[0088] The steam inlet of the first-effect heat exchanger serves as the live steam inlet;

[0089] The desulfurized wastewater outlet of the flash separator of the previous effect is connected to the desulfurized wastewater inlet pipeline of the flash separator of the next effect;

[0090] The steam outlet of the flash separator of the previous effect is connected to the steam inlet pipeline of the heat exchanger of the next effect.

[0091] Exemplarily, in this solution, the desulfurized wastewater enters the flash separator and is circulated by the circulation pump;

[0092] The desulfurized wastewater enters the flash separator for flashing, and the generated secondary steam is connected to the heat exchanger of the next effect through the steam pipeline at the top of the flash separator and serves as the heat source of the heat exchanger of the next effect;

[0093] The concentrated desulfurized wastewater from the previous effect enters the flash separator of the next effect for further flashing.

[0094] Based on the Figure 3 scheme shown, in an implementable scheme, a liquid level gauge is also configured on the flash separator;

[0095] The liquid level gauge is used to measure the liquid level of the desulfurized wastewater in the flash separator.

[0096] Exemplarily, in this scheme, the operator can monitor the working state of the flash separator through the above-mentioned liquid level measurement. When the liquid level parameter is abnormal, the operator adjusts the flash separator.

[0097] Based on the Figure 3 scheme shown, in an implementable scheme, the desulfurized wastewater treatment system further includes several flash separator valves;

[0098] The desulfurized wastewater outlet of the flash separator of the previous effect is connected to the desulfurized wastewater inlet pipeline of the flash separator of the next effect through a flash separator valve.

[0099] Exemplarily, in this scheme, the flash separator valve is used to adjust the flow rate of the desulfurized wastewater output from the flash separator of the previous effect to the flash separator of the next effect.

[0100] Based on the Figure 3 scheme shown, in an implementable scheme, a third densitometer is also configured on the flash separator;

[0101] The third densitometer is used to measure the density of the desulfurized wastewater in the flash separator.

[0102] Exemplarily, in this scheme, the operator can monitor the working state of the flash separator through the density of the above-mentioned desulfurized wastewater. When the density parameter is abnormal, the operator adjusts the flash separator.

[0103] Based on the Figure 3 scheme shown, in an implementable scheme, the flash separators from the second effect to the penultimate effect are also configured with a fourth flow sensor and a fourth densitometer;

[0104] The fourth flow sensor and the fourth densitometer are arranged on the pipeline from the desulfurized wastewater outlet of the flash separator of the previous effect to the desulfurized wastewater inlet of the flash separator of the next effect.

[0105] Exemplarily, in this scheme, the fourth flow sensor is used to measure the flow rate of the desulfurized wastewater output from the flash separator, and the fourth densitometer is used to measure the concentration of the desulfurized wastewater output from the flash separator;

[0106] The operator can monitor the working state of the flash separator through the above-mentioned flow rate and concentration measurement values. When the flow rate and / or concentration parameters are abnormal, the operator adjusts the flash separator.

[0107] On the basis of any of the above solutions, in an implementable solution, the desulfurized wastewater treatment system includes three of the effector units.

[0108] Figure 4 It is a schematic structural diagram of the desulfurized wastewater treatment system in the embodiment. Refer to Figure 4 On the basis of any of the above solutions, in an implementable solution, the desulfurized wastewater treatment system includes:

[0109] The first flash separator 101, the first heat exchanger 102, the first circulation pump 103, the second flash separator 201, the second heat exchanger 202, the second circulation pump 203, the third flash separator 301, the third heat exchanger 302, and the third circulation pump 303;

[0110] The first flash separator 101, the first heat exchanger 102, and the first circulation pump 103 are connected in series to form the first-effect effector unit;

[0111] The second flash separator 201, the second heat exchanger 202, and the second circulation pump 203 are connected in series to form the second-effect effector unit;

[0112] The third flash separator 301, the third heat exchanger 302, and the third circulation pump 303 are connected in series to form the third-effect effector unit;

[0113] The live steam inlet end of the first heat exchanger 102 is provided with a live steam valve 2, a first flow sensor 3, and a pressure sensor 8;

[0114] The desulfurized wastewater inlet of the first flash separator 101 is provided with a desulfurized wastewater inlet valve 10, as well as a second flow sensor 4 and a first densitometer 6;

[0115] The first flash separator 101 is further provided with a first liquid level gauge 104, a first flash separator valve 105, a first fourth flow sensor 106, and a first fourth densitometer 107;

[0116] The second flash separator 201 is further provided with a second liquid level gauge 204, a second flash separator valve 205, a second fourth flow sensor 206, and a second fourth densitometer 207;

[0117] The third flash separator 301 is further provided with a third liquid level gauge 304, a third flash separator valve 305, a third flow sensor 5, a second densitometer 7, and the third flash separator 301 is further connected to a condenser 9;

[0118] The third flash separator 301 is also equipped with a reflux valve 1. The desulfurized wastewater outlet of the third flash separator 301 is connected to the desulfurized wastewater inlet of the first flash separator 101 through the reflux valve 1.

[0119] In this solution, the desulfurized wastewater treatment system mainly includes a heat exchanger, a flash separator, a circulation pump, and a condenser. The desulfurized wastewater enters the flash separator and is circulated by the circulation pump.

[0120] The live steam enters the first heat exchanger 102 through the heating steam pipeline. After being used as the evaporation heat source to preheat the desulfurized wastewater, the desulfurized wastewater enters the first flash separator 101 for flashing. The secondary steam generated by the first flash separator 101 is connected to the second heat exchanger 202 through the steam pipeline at its top and serves as the heat source for the second heat exchanger 202.

[0121] The desulfurized wastewater concentrated by the first flash separator 101 enters the second flash separator 201 for further flashing.

[0122] The secondary steam generated by the second flash separator 201 is connected to the third heat exchanger 302 through the steam pipeline at its top and serves as the heat source for the third heat exchanger 302.

[0123] The desulfurized wastewater (concentrated water) concentrated by the third flash separator 301 is discharged through the third flash separator valve 305.

[0124] The secondary steam at the last effect of the third flash separator 301 enters the condenser 9 to be cooled into condensed water for recycling.

[0125] In this solution, the desulfurized wastewater treatment system is a multi-effect evaporation system. Among them, the inlet of the flash separator in the previous effect inputs the desulfurized wastewater, and the outlet is connected to the inlet of the flash separator in the next effect.

[0126] The desulfurized wastewater outlet of the flash separator in the previous effect is connected to the desulfurized wastewater inlet pipeline of the flash separator in the next effect through a flash separator valve.

[0127] The flash separator valve is used to adjust the flow rate of the desulfurized wastewater output from the flash separator in the previous effect to the flash separator in the next effect.

[0128] The inlet of the first flash separator is equipped with a second flow sensor and a first densitometer. The inlets of the second flash separator and the third flash separator are also equipped with a fourth flow sensor and a fourth density. A liquid level gauge is configured on the flash separator.

[0129] In this solution, the flow sensor and the densitometer are used to monitor the flow rate and concentration of the desulfurized wastewater, and the liquid level gauge is used to monitor the liquid level change in the flash separator.

[0130] In this solution, the flow rate, concentration, and liquid level data can be transmitted to the DCS (Distributed Control System) system. The DCS system is configured to control the valve opening of the flash separator and the frequency of the circulation pump according to the received data, so that the liquid level is controlled within ±2% of the design value;

[0131] The concentrated water flows out of the third flash separator, and a second densitometer is installed on the concentrated water pipeline. The second densitometer is used to detect the concentration of the concentrated water;

[0132] When the concentration of the concentrated water does not meet the set value range, the concentrated water returns to the first flash separator through the reflux valve for further concentration. When the concentration meets the set value range, the concentrated water is discharged through the valve of the third flash separator;

[0133] In the above multi-effect evaporation system, raw steam is input into the steam input port of the first heat exchanger, and the steam outlet of the flash separator is connected to the steam inlet of the next-effect heat exchanger;

[0134] A raw steam valve is configured at the steam input port of the first heat exchanger. The raw steam valve is used to control the input flow rate of the raw steam;

[0135] A first flow sensor and a pressure sensor are configured at the steam input port of the first heat exchanger. The two are respectively used to monitor the flow rate and pressure of the raw steam in real time;

[0136] In the above multi-effect evaporation system, a first flow sensor and a pressure sensor are installed on the intake pipeline of the raw steam. The pressure and flow rate of the raw steam are detected and standard signals are output and transmitted to the DCS control subsystem;

[0137] An operator controls the opening of the raw steam valve through the DCS control subsystem, controls the flow rate of the raw steam according to the set value, and stabilizes the flow rate and pressure of the raw steam within a deviation range of 5% of the set value;

[0138] For other flash separators of each effect, a pressure transmitter, a flow transmitter, and a steam regulating valve can also be installed on the heating steam inlet pipeline to detect the pressure and flow rate of the corresponding secondary steam;

[0139] The standard signals output by these pressure transmitters and flow transmitters can be transmitted to the DCS control subsystem. An operator controls the opening of each steam regulating valve through the DCS control subsystem to control the flow rate of the secondary steam and stabilize the flow rate of the secondary steam within a deviation range of 5% of the set value;

[0140] In the above multi-effect evaporation system, a second flow sensor and a first densitometer are installed on the desulfurized wastewater inlet pipeline of the first flash separator. The two are respectively used to detect the flow rate and concentration of the desulfurized wastewater and output standard signals to the DCS control subsystem;

[0141] The opening degree of the desulfurized wastewater inlet valve is controlled manually through the DCS control subsystem, and the flow rate of the desulfurized wastewater is controlled according to the set value, so that the flow rate is stabilized within a deviation range of 5% of the set value;

[0142] In the above multi-effect evaporation system, a densitometer is installed on the desulfurized wastewater outlet pipeline to detect the concentration of the concentrated water, and a standard signal is output and transmitted to the DCS control subsystem. The DCS control subsystem collects this signal, the flow rate and temperature signals of the live steam, and the flow rate and concentration signals of the desulfurized wastewater inlet and other initial parameters.

[0143] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A desulfurized wastewater treatment system, characterized in that, Comprising: A plurality of effector units, further including a reflux valve and a live steam valve; The effector units are connected in sequence; The live steam inlet of the first effector unit is configured with the live steam valve; The desulfurized wastewater outlet of the last effector unit is configured with the reflux valve, and the desulfurized wastewater outlet of the last effector unit is connected to the desulfurized wastewater inlet of the first effector unit through the reflux valve; The live steam valve is configured to act according to a live steam valve control instruction.

2. The desulfurized wastewater treatment system according to claim 1, characterized in that, Also including: A first flow sensor, a second flow sensor, a third flow sensor, a first densitometer, a second densitometer, and a pressure sensor; The live steam inlet of the first effector unit is configured with the first flow sensor and the pressure sensor, and the desulfurized wastewater inlet of the first effector unit is configured with the second flow sensor and the first densitometer; The desulfurized wastewater outlet of the last effector unit is configured with the third flow sensor and the second densitometer; The first flow sensor, the second flow sensor, and the third flow sensor are respectively used to measure the live steam input amount, the desulfurized wastewater inlet flow rate, and the desulfurized wastewater reflux port flow rate; The first densitometer and the second densitometer are respectively used to measure the desulfurized wastewater inlet concentration and the desulfurized wastewater reflux port concentration; The pressure sensor is used to measure the live steam pressure; The desulfurized wastewater inlet flow rate and the desulfurized wastewater reflux port flow rate are used to determine the desulfurized wastewater flow rate, and the desulfurized wastewater inlet concentration and the desulfurized wastewater reflux concentration are used to determine the initial desulfurized wastewater concentration; The desulfurized wastewater flow rate, the initial desulfurized wastewater concentration, the live steam pressure, and the desulfurized wastewater treatment target concentration are used to determine the live steam consumption; The live steam consumption is used to generate the live steam valve control instruction, and the live steam valve control instruction is used to adjust the live steam input amount to be the same as the live steam consumption.

3. The desulfurized wastewater treatment system according to claim 1, characterized in that, Also including a condenser, and the steam output port of the effector unit of the last effect is connected to the condenser.

4. The desulfurized wastewater treatment system according to claim 1, characterized in that, Also including a desulfurized wastewater inlet valve; The desulfurized wastewater inlet of the first effector unit is configured with the desulfurized wastewater inlet valve.

5. The desulfurized wastewater treatment system according to claim 1, wherein, The effector unit includes a flash separator, a heat exchanger, and a circulation pump; The flash separator, the heat exchanger, and the circulation pump are connected in series to form a desulfurized wastewater circulation loop; The heat exchanger is configured with a steam inlet, and the flash separator is configured with a desulfurized wastewater inlet, a desulfurized wastewater outlet, and a steam output port; The steam inlet of the heat exchanger of the first effect is used as the live steam inlet; The desulfurized wastewater outlet of the flash separator of the previous effect is connected to the desulfurized wastewater inlet pipeline of the flash separator of the next effect; The steam output port of the flash separator of the previous effect is connected to the steam inlet pipeline of the heat exchanger of the next effect.

6. The desulfurized wastewater treatment system according to claim 5, characterized in that, A liquid level gauge is further configured on the flash separator; The liquid level gauge is used to measure the liquid level of the desulfurized wastewater in the flash separator.

7. The desulfurized wastewater treatment system according to claim 5, characterized in that, Also including a number of flash separator valves; The desulfurized wastewater outlet of the flash separator of the previous effect is connected to the desulfurized wastewater inlet pipeline of the flash separator of the next effect through one of the flash separator valves.

8. The desulfurized wastewater treatment system according to claim 5, characterized in that, A third densitometer is further configured on the flash separator; The third densitometer is used to measure the density of the desulfurized wastewater in the flash separator.

9. The desulfurized wastewater treatment system according to claim 5, characterized in that, The flash separators of the second effect to the penultimate effect are further equipped with a fourth flow sensor and a fourth densitometer; The fourth flow sensor and the fourth densitometer are arranged on the pipeline from the desulfurized wastewater outlet of the flash separator of the previous effect to the desulfurized wastewater inlet of the flash separator of the next effect.

10. The desulfurized wastewater treatment system according to claim 1, wherein It includes three such effector units.

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