Efficient water-saving and emission-reducing device for petroleum refining circulating cooling water

Abstract

The utility model relates to the technical field of industrial water treatment, in particular to an efficient water-saving and emission-reducing device for petroleum refining circulating cooling water, which comprises a circulating cooling water bypass filtering unit, a circulating cooling water bypass filtering unit, a circulating cooling water bypass filtering unit, a circulating cooling water bypass filtering unit and a circulating cooling water bypass filtering unit, the circulating cooling water bypass efficient crystallization, hardness removal and softening equipment is used for receiving the other part of high-temperature circulating cooling water which absorbs heat and is prone to scaling, if the water hardness exceeds a preset value, rapid crystallization, hardness removal and softening treatment is conducted on the circulating cooling water, then deep filtration and hardness removal are conducted, and if the water hardness does not exceed the preset value, rapid crystallization and hardness removal are conducted on the circulating cooling water. And directly carrying out deep filtration and hardness removal on the other path of circulating cooling water. According to the scheme, the scaling ion concentration in the circulating cooling water is reduced, the suspended matter concentration and turbidity in the circulating cooling water are reduced, and efficient water saving and emission reduction are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial water treatment technical field, concretely relates to a kind of petroleum refining circulating cooling water efficient water-saving emission reduction device. BACKGROUND

[0002] Petroleum refining industry is a big water consumer, and single-product water consumption is an important indicator for assessing the production efficiency of refining enterprises. Water saving and emission reduction are also important responsibilities of petrochemical enterprises. In particular, under the requirement of gradually eliminating inefficient, unstable and non-compliant water-related devices, combined with the current situation of production enterprises, research and development investment is increased, new technologies and processes are gradually adopted, wastewater utilization rate is improved, wastewater discharge is gradually reduced, and the goal of zero industrial wastewater discharge is gradually approached.

[0003] Currently, petroleum refining industrial enterprises mainly focus on improving the number of cycles of circulating cooling water, increasing the concentration ratio, reducing wastewater discharge, reducing fresh water replenishment and improving the rate of wastewater deep treatment and reuse in the field of industrial circulating cooling water saving. The most important factor affecting water saving and emission reduction in this process is to increase the concentration ratio of circulating cooling water and the number of cycles of cooling water. However, arbitrarily increasing the concentration ratio of circulating cooling water will inevitably lead to the enrichment and precipitation of scale-forming substances in circulating cooling water, causing large-scale scaling of heat exchange devices, affecting heat exchange efficiency, and thus threatening the safe and stable operation of refining production devices. Therefore, how to efficiently and cleanly separate scale-forming substances from circulating cooling water or form a stable state of working conditions to prevent scaling of heat exchange units at high concentration ratios is a water-saving problem faced by most petroleum refining production enterprises.

[0004] Currently, there are several main processes for addressing the enrichment and precipitation of scale in circulating cooling water: traditional lime softening and descaling, ion exchange softening, and high-efficiency chemical scale inhibition and stabilization. Among these, the traditional lime softening + flocculation sedimentation process suffers from drawbacks such as a long reaction cycle, complex unit design, large footprint, high cost, large lime dosage, high equipment failure rate, and the generated sludge being difficult to dispose of properly. Furthermore, this technology offers limited reduction in effluent hardness, cannot efficiently remove scale from the water, and has limited effect on increasing the concentration ratio of circulating cooling water, resulting in high hardness and alkalinity, large wastewater discharge, and significant scaling risks. The overall water saving and emission reduction effect is not significant. Ion exchange softening, on the other hand, suffers from low processing load, low cycle water production, frequent regeneration, and the generation of acidic regeneration wastewater that cannot be recycled, leading to new high-salinity wastewater and corrosion problems. These methods are gradually being phased out. High-efficiency scale inhibitor treatment is still the process route used by most companies. However, this process involves adding large amounts of chemical agents to the cooling water system daily, yet can only control a limited concentration ratio. This results in large amounts of wastewater discharge and fresh water replenishment. The residual chemicals in the wastewater have significant negative impacts on water pollution and deep reuse. Wastewater treatment costs are high, resource recovery is impossible, industrial water utilization is low, and water consumption per product is high, leading to substantial water resource consumption. Furthermore, the addition of large amounts of chemical substances increases the environmental burden, and the cost of the chemicals remains high. Overall, the water-saving and emission-reduction effects are not significant. To completely eliminate the drawbacks of existing technologies, a targeted technical solution needs to be designed. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems existing in the prior art and provide a highly efficient water-saving and emission-reducing device for circulating cooling water in petroleum refining.

[0006] To achieve the above objectives, the first aspect of this utility model provides a high-efficiency water-saving and emission-reduction device for circulating cooling water in petroleum refining, comprising a heat exchange unit, and further comprising:

[0007] The circulating cooling water side-filter unit is connected to the heat exchange unit pipeline and is used to receive a portion of the high-temperature, easily scaled circulating cooling water from the heat exchange unit after heat absorption, and to filter out suspended solids in the water.

[0008] The circulating cooling water bypass high-efficiency crystallization and softening equipment is connected to the heat exchange unit pipeline. It is used to receive another part of the high-temperature, easily scaled circulating cooling water after heat absorption from the heat exchange unit. If the water hardness exceeds the preset value, the circulating cooling water is subjected to rapid crystallization and softening treatment, and then deep filtration is performed to remove hardness. If the water hardness does not exceed the preset value, the other circulating cooling water is directly subjected to deep filtration to remove hardness.

[0009] The circulating water return pressure bypass water supply unit is connected with the circulating cooling water bypass filtration unit and the circulating cooling water bypass high-efficiency crystallization water softening device respectively, and is used for supplying the high-temperature easy-fouling circulating cooling water into the circulating cooling water bypass filtration unit and the circulating cooling water bypass high-efficiency crystallization water softening device respectively by using the circulating cooling water return pressure as a source power.

[0010] The big data intelligent management and control unit is electrically connected with the circulating cooling water bypass filtration unit and the circulating cooling water bypass high-efficiency crystallization water softening device respectively, is used for monitoring and judging water quality indexes in the device in real time, feeding back water quality hardness to the circulating cooling water bypass high-efficiency crystallization water softening device, and controlling water in-out processes of the circulating cooling water bypass filtration unit and the circulating cooling water bypass high-efficiency crystallization water softening device.

[0011] Preferably, the circulating cooling water bypass filtration unit comprises a crystallization water softening device and a post-hardness-removal bypass filtration device, and the crystallization water softening device and the post-hardness-removal bypass filtration device are connected by pipelines.

[0012] The crystallization water softening device is used for performing rapid crystallization water softening treatment on the circulating cooling water, and the treated circulating cooling water flows into the post-hardness-removal bypass filtration device through a pipeline.

[0013] Preferably, the circulating cooling water bypass filtration unit further comprises a circulating cooling water bypass water inlet module, a crystal nucleus preferential adding module, an automatic dosing control module, a self-induced crystallization granulation water softening module, a monitoring and automatic control module, a particle discharge collection and byproduct comprehensive utilization module.

[0014] The circulating cooling water bypass water inlet module is used for supplying the high-temperature easy-fouling circulating cooling water after heat absorption into the crystallization water softening device or the post-hardness-removal bypass filtration device.

[0015] The crystal nucleus preferential adding module is used for adding the screened induced crystal nucleus which is uniform and stable to a crystallization separation zone position of the high-efficiency hardness-removal reactor, and is arranged at a side position of the high-efficiency hardness-removal reactor. The crystal nucleus preferential adding module comprises the high-efficiency hardness-removal reactor and a crystal nucleus adding device. The high-efficiency hardness-removal reactor directly guides water to the crystal nucleus adding device through a top water outlet pipeline. An online electromagnetic flowmeter and an electric regulating valve are arranged on the top water outlet pipeline to monitor and adjust the fluidized water amount of the crystal nucleus adding device in real time.

[0016] The automatic dosing control module is used for continuously adding liquid alkali or soda ash required by the induced crystallization reaction to a crystallization reaction zone of the high-efficiency hardness-removal reactor. The automatic dosing control module can automatically control the dosing amount according to the water in-out indexes collected by the monitoring and automatic control module, and realizes accurate dosing. The automatic dosing control module is arranged at an auxiliary machine position of the high-efficiency hardness-removal reactor, and a dosing point is arranged at a main reaction zone position on an upper part of a water distribution zone of the high-efficiency hardness-removal reactor.

[0017] The self-induction crystallization softening module is used for crystallization softening and is arranged at the center of the softening plant or the integrated platform;

[0018] The monitoring and automatic control module is used for online monitoring of the water quality of the system, and after logical analysis of the collected data by the big data intelligent management and control unit, the self-control module issues an instruction to other modules to realize automatic control of the water inflow and the amount of chemicals, and realize automatic control of the system; the monitoring and automatic control module is arranged on the water inflow and outflow pipeline of the softening device and in the local control cabinet.

[0019] The particle discharge collection and by-product comprehensive utilization module is in communication with the crystallization softening equipment and is used for recycling the by-product calcium carbonate particles.

[0020] Preferably, the circulating water back pressure bypass water supply unit includes a bypass water pipe installed on the circulating cooling water back pipe and a detection instrument and a control valve arranged on the bypass water pipe.

[0021] Preferably, the particle discharge collection and by-product comprehensive utilization module includes an automatic particle discharge pipeline, a self-cleaning pipeline and a self-separation and collection box, which are used for realizing automatic transportation and recycling of by-products.

[0022] Preferably, the big data intelligent management and control unit is used for automatically and continuously monitoring the water quality indicators of the softening equipment, linking the automatic chemical addition control module to add chemicals, and real-time controlling the water quality to meet the standard; and is used for automatically and continuously monitoring the water quality of the circulating cooling water bypass filter unit to ensure the stability of the recycled water quality.

[0023] Preferably, the device further includes a cooling tower, a circulating cooling water pre-tank and a heat exchange unit,

[0024] The cooling tower is used for heat dissipation and collection of the circulating cooling water.

[0025] The heat dissipation and collection of the circulating cooling water is in communication with the cooling tower and the heat exchange unit respectively, and is used for collecting the circulating cooling water after heat dissipation by the cooling tower, and performing descaling and sterilization treatment, and then sending the circulating cooling water into the heat exchange unit.

[0026] The heat exchange unit is in communication with the circulating cooling water bypass filter unit and the circulating cooling water bypass high-efficiency crystallization softening equipment respectively, and is used for transporting the high-temperature easy-to-scale circulating cooling water after heat absorption.

[0027] The process device has the following beneficial effects: 1. The process device has simple flow, modular design, high processing efficiency, high automation degree, small land occupation, small civil engineering quantity, high reproducibility of complete process package, can reduce the sewage water volume and production water consumption of a refining enterprise as a whole, realizes water saving and efficiency improvement of the whole refining industry, and has wide application prospect; 2. The process device belongs to a “recycling method” process route, can completely replace a traditional process route of a “disposal method”, finally realizes water saving and emission reduction, energy saving and consumption reduction, and helps petroleum refining enterprises to practice “green enterprise” goals and social responsibilities; 3. The complete water saving and emission reduction device is combined by self-induced chemical crystallization reaction and pellet physical fluidization reaction, has high flow rate, high decalcification rate, good decalcification effect, low water hardness, low water turbidity, strong running stability, small water turbidity fluctuation, high water quality, and can automatically adjust water hardness at any time according to the running condition requirement of a refining production host by a big data intelligent control device, strongly guarantees safe, efficient and economic running of the refining production device, can greatly improve the concentration multiple of a circulating cooling water device, realizes water saving and emission reduction, improves enterprise industrial wastewater utilization rate, can reduce the water volume entering a subsequent high-salinity water deep treatment device, and greatly reduces the running cost of high-salinity water deep treatment and reuse; 4. The process device has simple by-products, and the only by-product is 2-3mm calcium carbonate particles, the calcium carbonate has high purity, more than 92%, and basically does not contain water, and can be completely reused to a boiler desulfurization section of an enterprise; realizes resource reuse of by-products, realizes circular economy, and the “recycling method” process route is far superior to a traditional “disposal method” process route. No other wastewater and waste is discharged, completely solves the disadvantages of a traditional process, has higher running efficiency, lower running cost, and is more environmentally friendly. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a high-efficiency water saving and emission reduction device diagram for a petroleum refining circulating cooling water device.

[0029] Figure 1 Mechanical ventilation cooling tower-1, circulating cooling water front pool-2, circulating cooling water pump-3, refining heat exchange unit-4, mechanical ventilation fan-5, circulating cooling water side filter unit-6, crystallization hardening removal equipment-7, side filter equipment after hardening removal-8, sewage pool-9, high-salinity water treatment unit-10, heat and power boiler desulfurization section-11, chemical adding room-12. DETAILED DESCRIPTION

[0030] The specific embodiments of the utility model embodiments are described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model embodiments, and are not used to limit the utility model embodiments.

[0031] The utility model discloses a first aspect provides a kind of petroleum refining circulating cooling water efficient water-saving emission reduction device, comprising:

[0032] Circulating cooling water bypass filtration unit is connected with heat exchange unit pipeline, for receiving part of high-temperature easy scale-forming circulating cooling water after heat absorption from heat exchange unit, filtering to remove suspended solids in water;

[0033] Circulating cooling water bypass high-efficiency crystallization hardness-removal softening equipment is connected with heat exchange unit pipeline, for receiving another part of high-temperature easy scale-forming circulating cooling water after heat absorption from heat exchange unit, if water hardness exceeds preset value, then fast crystallization hardness-removal softening treatment is carried out on circulating cooling water, and then depth filtration hardness removal is carried out, if water hardness does not exceed preset value, then depth filtration hardness removal is directly carried out on the other circulating cooling water;

[0034] Circulating water backwater residual pressure bypass water supply unit is connected with the circulating cooling water bypass filtration unit and circulating cooling water bypass high-efficiency crystallization hardness-removal softening equipment pipeline respectively, for using circulating cooling water backwater residual pressure as source power to send the high-temperature easy scale-forming circulating cooling water into the circulating cooling water bypass filtration unit and circulating cooling water bypass high-efficiency crystallization hardness-removal softening equipment respectively;Circulating water backwater residual pressure bypass water supply unit includes bypass water connection pipeline installed in circulating cooling water backwater pipeline and detection instrument and control valve arranged on bypass water connection pipeline;

[0035] Big data intelligent management and control unit is electrically connected with the circulating cooling water bypass filtration unit and circulating cooling water bypass high-efficiency crystallization hardness-removal softening equipment respectively, for real-time monitoring and judging water quality index in device, feeding back water hardness to the circulating cooling water bypass high-efficiency crystallization hardness-removal softening equipment, and controlling water inlet and outlet process of the circulating cooling water bypass filtration unit and circulating cooling water bypass high-efficiency crystallization hardness-removal softening equipment.

[0036] The circulating cooling water bypass filtration unit includes crystallization hardness-removal softening equipment and hardness-removal bypass filtration equipment, the crystallization hardness-removal softening equipment and hardness-removal bypass filtration equipment are connected by pipeline,

[0037] The crystallization hardness-removal softening equipment is used for fast crystallization hardness-removal softening treatment on circulating cooling water, and the treated circulating cooling water flows into the hardness-removal bypass filtration equipment through pipeline, and the hardness-removal bypass filtration equipment is used for depth filtration hardness removal.

[0038] The circulating cooling water return water excess pressure bypass water supply unit is provided with a bypass water pipe, detection instruments and control valves, etc. installed in the circulating cooling water return pipe. The circulating cooling water return water excess pressure is used as the source power of the softening unit and the filtering unit, replacing the traditional design of the water supply pipe network and the water supply pump, so as to realize low-cost operation and simple control of the device. The above units and modules form a set of oil refining circulating cooling water saving and emission reduction device. Through step-by-step reaction and state control, different scale-forming substances and turbidity are removed, softening and turbidity reduction of the circulating cooling water are realized, and the resource utilization of by-products is realized.

[0039] Further, the circulating cooling water bypass filter unit further comprises a circulating cooling water bypass water inlet module, a crystal nucleus preferential adding module, an automatic dosing control module, a self-induced crystallization granulation hardness removal and softening module, a monitoring and automatic control module, a particle discharge collection and by-product comprehensive utilization module, an automatic water inlet module, a non-powered self-filtration and self-backwashing module,

[0040] The automatic water inlet module is used for sending the high-temperature easy scale-forming circulating cooling water after heat absorption into the circulating cooling water bypass filter unit.

[0041] The non-powered self-filtration and self-backwashing module is used for deep filtration and turbidity reduction of the effluent after efficient hardness removal and softening, reduction of suspended solids content, automatic backwashing regeneration and recovery of filtration function. The non-powered self-filtration and self-backwashing module is arranged at a position behind the efficient hardness removal reactor and is connected in series with the efficient hardness removal reactor through an effluent pipeline.

[0042] The circulating cooling water bypass water inlet module is used for sending the high-temperature easy scale-forming circulating cooling water after heat absorption into the crystallization hardness removal and softening equipment or the hardness removal and bypass filtration equipment.

[0043] The crystal nucleus preferential adding module is used for uniformly and stably adding the screened special induced crystal nucleus to a crystallization separation zone position of the efficient hardness removal reactor. The crystal nucleus preferential adding module is arranged at a side position of the efficient hardness removal reactor. The crystal nucleus preferential adding module comprises an efficient hardness removal reactor and a crystal nucleus adding device. The efficient hardness removal reactor is directly connected to the crystal nucleus adding device through a top effluent pipeline. An online electromagnetic flowmeter and an electric regulating valve are arranged on the top effluent pipeline to monitor and adjust the fluidized water amount of the crystal nucleus adding device in real time.

[0044] The automatic dosing control module is used for uniformly and continuously adding liquid caustic soda or soda ash required by the induced crystallization reaction to a crystallization reaction zone of the efficient hardness removal reactor. The automatic dosing control module can automatically control the dosing amount according to the inlet and outlet water indexes collected by the detection and automatic control module, so as to realize precise dosing of the reagent. The automatic dosing control module is arranged at an auxiliary machine position of the efficient hardness removal reactor. A dosing point is arranged at a main reaction zone position above a water distribution zone of the efficient hardness removal reactor.

[0045] The self-induced crystallization granulation hardness removal and softening module is used for crystallization granulation hardness removal and is arranged at a central position of a hardness removal and softening workshop or a skid-mounted integrated platform.

[0046] The monitoring and automatic control module is used for online monitoring of water quality of the system, and after logical analysis of collected data by a big data intelligent management and control unit, an instruction is issued to other modules by the automatic control module to realize automatic regulation and control of water inflow and dosing amount, and automatic regulation and control operation of the system. It is arranged on the water inlet and outlet pipelines of the hardness removal and softening device and in the local control cabinet;

[0047] The particle discharge collection and by-product comprehensive utilization module is in communication with the crystallization hardness removal and softening equipment, and is used for recycling of by-product calcium carbonate particles, and includes an automatic particle discharge pipeline, a self-flushing pipeline and a self-separation and collection tank, and is used for automatic transportation and recycling of by-products.

[0048] The self-induced crystallization and granulation hardness removal and softening module is used for the crystallization and granulation hardness removal and softening of the selected crystallization induction material. The material has strong physical and chemical stability, and its hardness and density are suitable for the conditions required by the chemical and physical reactions of the crystallization and granulation hardness removal and softening. The module realizes step-by-step reaction, internal circulation fluidization, and controllable and adjustable operation mode. The crystal nucleus is added by directly introducing water from the existing high-efficiency hardness removal reactor top water outlet pipeline to the crystal nucleus adding device. An online electromagnetic flowmeter and an electric regulating valve are arranged on the water inlet pipeline to realize real-time monitoring and adjustment of the fluidized water amount of the crystal nucleus adding device. The big data intelligent management and control unit is an automatic intelligent monitoring platform. During the operation of the whole device, relevant parameters are automatically collected to realize intelligent process monitoring, ensure stable operation of the device, and ensure that the process indicators meet the requirements.

[0049] Further, the big data intelligent management and control unit is used for automatically and continuously monitoring water quality indicators of the hardness removal and softening equipment, automatically adding chemicals through the automatic chemical dosing and control module, and real-time control of water quality to meet the standards; and is used for automatically and continuously monitoring water quality of the circulating cooling water bypass filtration unit to ensure stable water quality.

[0050] Further, the device further comprises a cooling tower, a circulating cooling water pre-tank and a heat exchange unit,

[0051] The cooling tower is used for heat dissipation and cooling collection of the circulating cooling water.

[0052] The heat dissipation and cooling collection of the circulating cooling water is in communication with the cooling tower and the heat exchange unit respectively, and is used for collecting the circulating cooling water after heat dissipation by the cooling tower, and performing descaling and sterilization treatment, and then sending the circulating cooling water into the heat exchange unit.

[0053] The heat exchange unit is in communication with the circulating cooling water bypass filtration unit and the circulating cooling water bypass high-efficiency crystallization hardness removal and softening equipment respectively, and is used for conveying the high-temperature easy-to-scale circulating cooling water after heat absorption.

[0054] The process flow of the high-efficiency water-saving and emission-reduction unit for circulating cooling water in petroleum refining is as follows: Figure 1 As shown, the mechanical ventilation cooling tower 1 of the refining and chemical industry enterprise undertakes the functions of heat dissipation, cooling and collection of circulating cooling water during normal operation. After ventilation and heat dissipation, the circulating cooling water first collects in the circulating cooling water forepool 2. A certain amount of slow-release scale inhibitor and bactericide are added through the chemical addition room 12. After mixing, the circulating cooling water is pumped out by the circulating cooling water pump 3 and pumped into the heat exchange unit 4 of the petroleum refining and chemical production unit to exchange heat and cool down the refining and chemical production unit and the production product medium. The circulating cooling water has a high temperature after absorbing heat. Through the residual pressure of the pipeline network, it returns to the mechanical ventilation cooling tower 1. After forced ventilation and heat exchange and cooling by the mechanical ventilation fan 5, it flows back to the bottom of the mechanical ventilation cooling tower 1, and so on. To achieve the goal of efficiently removing scale and suspended solids from the circulating cooling water, the high-temperature, easily scale-forming circulating cooling water discharged from the refining and chemical heat exchange unit 4 is introduced into the circulating cooling water bypass filtration unit 6 through the return water bypass pipeline for filtering suspended solids and other impurities. Simultaneously, a portion of the return water is diverted into the high-efficiency crystallization and softening equipment 7 via a return water residual pressure diversion device. Under the dual action of chemical crystallization and physical fluidization, scale-forming substances in the bypass circulating cooling water are rapidly and efficiently physically separated, resulting in a significant reduction in the total hardness and alkalinity of the effluent. The softened effluent then uses residual pressure to enter the dedicated hardness-removing bypass filtration equipment 8 for deep filtration and turbidity reduction treatment. Finally, high-quality water with low hardness, low alkalinity, and low turbidity is replenished into the circulating cooling water forepool 2, mixed with the cooling tower water, and then pumped again by the circulating cooling water pump 3 into the refining and chemical heat exchange unit. In heat exchange unit 4, the water undergoes heat exchange and cooling. Due to the high quality of the effluent after bypass hardening, softening, and high-efficiency filtration, the concentration of scaling substances is significantly reduced. The quality of the circulating cooling water entering the refining heat exchange unit is high, which greatly reduces the scaling rate and risk in the heat exchange unit. The amount of wastewater discharged from the circulating cooling water device is significantly reduced, the concentration ratio of the device gradually increases, and the amount of fresh water replenishment is significantly reduced, achieving water saving and emission reduction effects. At the same time, due to the good water quality of the device, the amount of high-salt wastewater entering the wastewater discharge pond 9 of the circulating cooling device is significantly reduced, which in turn significantly reduces the amount of high-salt wastewater entering the subsequent high-salt wastewater deep treatment unit 10. The load of the high-salt water deep treatment unit 10 is reduced, and the overall operating cost is significantly reduced. Meanwhile, the by-product calcium carbonate particles of this process are directly transported to the desulfurization section 11 of the thermal power boiler for comprehensive utilization of by-products, realizing a circular economy.

[0055] By physically extracting and separating scale-forming substances from circulating cooling water, the concentration of scale ions in the circulating cooling water is reduced, as are the concentration of suspended solids and turbidity. This completely solves numerous problems in petroleum refining circulating cooling water units, such as low concentration ratio, large amount of wastewater discharge, large amount of chemical reagents added, difficulty in treating circulating cooling water wastewater, high turbidity of softened effluent, difficulty in reuse, high operating cost of deep wastewater treatment, inability to achieve resource recycling, low industrial water utilization rate, and large water consumption, thus achieving efficient water conservation and emission reduction.

[0056] In summary, the technical scheme of the utility model has the following effects: 1. The process device designed by the utility model has simple flow, modular design, high processing efficiency, high automation degree, small land occupation, small civil engineering quantity, strong replicability of complete process package, can reduce the wastewater discharge and water consumption of a refining enterprise as a whole, realizes water saving and efficiency improvement of the whole refining industry, and has wide application prospect; 2. The process device designed by the utility model belongs to a "recovery method" process route, can completely replace the traditional process route of a "disposal method", finally realizes water saving and emission reduction, energy saving and consumption reduction, and helps petroleum refining enterprises to practice the "green enterprise" goal and social responsibility; 3. The complete water saving and emission reduction device designed by the utility model is combined by self-induced chemical crystallization reaction and pellet physical fluidization reaction, has high flow rate, high decalcification rate, good decalcification effect, low water hardness, low water turbidity, strong running stability, small water turbidity fluctuation, high water quality, and can automatically adjust water hardness at any time according to the running condition requirement of a refining production host by a big data intelligent control device, strongly guarantees the safe, efficient and economic running of a refining production device, can greatly improve the concentration multiple of a circulating cooling water device, realizes water saving and emission reduction, improves the utilization rate of enterprise industrial wastewater, can reduce the water quantity entering a subsequent high-salinity water deep treatment device, and greatly reduces the running cost of high-salinity water deep treatment and reuse; 4. The process device designed by the utility model has simple by-products, and the only by-product is 2-3mm calcium carbonate particles, the purity of calcium carbonate is more than 92%, basically does not contain water, and can be completely reused to a boiler desulfurization section of an enterprise; realizes resource reuse of by-products, realizes circular economy, and the "recovery method" process route of the utility model is far superior to the traditional "disposal method" process route. No other wastewater and waste are discharged, completely solves the drawbacks of the traditional process, has higher running efficiency, lower running cost, and is more environmentally friendly.

[0057] The preferred embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to this. Within the technical concept range of the utility model, the technical scheme of the utility model can be variously simply modified and combined in any suitable way. In order to avoid unnecessary repetition, the utility model does not further describe various possible combination modes. However, these simple modifications and combinations should also be regarded as the disclosed content of the utility model, and all belong to the protection range of the utility model.

Claims

1. A high-efficiency water-saving and emission-reducing device for petroleum refining circulating cooling water, comprising a heat exchange unit, characterized in that, Also comprising: A circulating cooling water bypass filtration unit connected with the heat exchange unit pipeline, used to receive a part of the high-temperature easy-to-scale circulating cooling water after heat absorption from the heat exchange unit, and to remove suspended solids in the water by filtration; A circulating cooling water bypass high-efficiency crystallization hardness removal and softening device connected with the heat exchange unit pipeline, used to receive another part of the high-temperature easy-to-scale circulating cooling water after heat absorption from the heat exchange unit, and to perform rapid crystallization hardness removal and softening treatment on the circulating cooling water if the water hardness exceeds the preset value, and then to perform deep filtration hardness removal, or to directly perform deep filtration hardness removal on another part of the circulating cooling water if the water hardness does not exceed the preset value; A circulating water return pressure bypass water supply unit connected with the circulating cooling water bypass filtration unit and the circulating cooling water bypass high-efficiency crystallization hardness removal and softening device, respectively, used to use the circulating cooling water return pressure as a source of power to send the high-temperature easy-to-scale circulating cooling water into the circulating cooling water bypass filtration unit and the circulating cooling water bypass high-efficiency crystallization hardness removal and softening device, respectively; A big data intelligent management and control unit electrically connected with the circulating cooling water bypass filtration unit and the circulating cooling water bypass high-efficiency crystallization hardness removal and softening device, respectively, used to monitor and judge water quality indicators in real time, feed back water hardness to the circulating cooling water bypass high-efficiency crystallization hardness removal and softening device, and control the water in and out process of the circulating cooling water bypass filtration unit and the circulating cooling water bypass high-efficiency crystallization hardness removal and softening device.

2. The apparatus of claim 1, wherein, The circulating cooling water bypass filtration unit comprises a crystallization hardness removal and softening device and a post-hardness-removal bypass filtration device, which are connected by pipelines, The crystallization hardness removal and softening device is used to perform rapid crystallization hardness removal and softening treatment on the circulating cooling water, and the treated circulating cooling water flows into the post-hardness-removal bypass filtration device through a pipeline.

3. The apparatus of claim 2, wherein, The circulating cooling water bypass filtration unit further comprises a circulating cooling water bypass water inlet module, a crystal nucleus optimization adding module, an automatic dosing control module, a self-induced crystallization granulation hardness removal and softening module, a monitoring and automatic control module, a particle discharge collection and byproduct comprehensive utilization module, The circulating cooling water bypass water inlet module is used to send the high-temperature easy-to-scale circulating cooling water after heat absorption into the crystallization hardness removal and softening device or the post-hardness-removal bypass filtration device; The crystal nucleus optimization adding module is used to add the screened induced crystal nucleus uniformly and stably to the crystallization separation zone position of the high-efficiency hardness removal reactor, and is arranged at the side position of the high-efficiency hardness removal reactor; the crystal nucleus optimization adding module comprises the high-efficiency hardness removal reactor and a crystal nucleus feeder, the high-efficiency hardness removal reactor directly guides water to the crystal nucleus feeder through a top water outlet pipeline, and an online electromagnetic flowmeter and an electric regulating valve are arranged on the top water outlet pipeline to monitor and adjust the fluidized water amount of the crystal nucleus feeder in real time; The automatic dosing control module is used for uniformly and continuously adding liquid alkali or soda ash required for inducing crystallization reaction to the crystallization reaction zone of the high-efficiency hardness removal reactor, and can automatically control the dosing amount according to the inlet and outlet water indexes collected by the detection and automatic control module, so as to realize accurate dosing of the reagent; the automatic dosing control module is arranged at the auxiliary machine position of the high-efficiency hardness removal reactor, and the dosing point is arranged at the main reaction zone position above the water distribution zone of the high-efficiency hardness removal reactor; The self-induced crystallization granulation hardness removal and softening module is used for crystallization granulation hardness removal, and is arranged at the center position of the hardness removal and softening workshop or the skid-mounted integrated platform; The monitoring and automatic control module is used for online monitoring of the water quality of the inlet and outlet water of the system, and after logical analysis of the collected data by the big data intelligent management and control unit, the self-control module issues instructions to other modules to realize automatic control of the inlet water flow and the dosing amount, and realizes automatic control operation of the system; the monitoring and automatic control module is arranged on the inlet and outlet water pipelines of the hardness removal and softening device and in the local control cabinet; The particle discharge collection and by-product comprehensive utilization module is communicated with the crystallization hardness removal and softening equipment, and is used for recycling the by-product calcium carbonate particles.

4. The apparatus of claim 1, wherein, The circulating water backwater pressure bypass water supply unit includes a bypass water connection pipeline installed on the circulating cooling water backwater pipeline and detection instruments and control valves arranged on the bypass water connection pipeline.

5. The apparatus of claim 3, wherein, The particle discharge collection and by-product comprehensive utilization module includes an automatic particle discharge pipeline, a self-cleaning pipeline and a self-separation and collection box, and is used for realizing automatic transportation and recycling of by-products.

6. The apparatus of claim 3, wherein, The big data intelligent management and control unit is used for automatically and continuously monitoring the inlet and outlet water quality indexes of the hardness removal and softening equipment, linking the automatic dosing control module to dose, and real-time controlling the water quality of produced water to meet the standard; and is used for automatically and continuously monitoring the outlet water quality of the circulating cooling water bypass filtration unit to ensure the stability of the recycled water quality.

7. The apparatus of any one of claims 1-6, wherein, The device further includes a cooling tower, a circulating cooling water forebay and a heat exchange unit, The cooling tower is used for heat dissipation and cooling collection of circulating cooling water; The heat dissipation and cooling collection of circulating cooling water is respectively communicated with the cooling tower and the heat exchange unit pipeline, and is used for collecting the circulating cooling water after heat dissipation by the cooling tower, and performing descaling and sterilization treatment, and then sending the circulating cooling water into the heat exchange unit; The heat exchange unit is respectively communicated with the circulating cooling water bypass filtration unit and the circulating cooling water bypass high-efficiency crystallization hardness removal and softening equipment pipeline, and is used for transporting the high-temperature easy-to-scale circulating cooling water after heat absorption.

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