阅读说明：本技术 一种连续排污和回用的工业循环水整体处理系统及工艺 (Continuous sewage discharge and reuse industrial circulating water integral treatment system and process ) 是由 赵广虎 刘杰 李斐 于 2020-07-13 设计创作，主要内容包括：本发明涉及工业循环水处理的技术领域,特别是涉及一种连续排污和回用的工业循环水整体处理系统及工艺,其可以减少高浓度排污水对设备的腐蚀问题,提高工业循环水的水质和系统的稳定性,提升工业循环水的用水效率,减少排污量,并且可以延长设备的使用寿命,使循环水系统可以长期运行,该系统包括循环水冷却塔、循环泵、换热器、电化学处理系统、杀菌除垢系统和连续电离处理系统,该工艺包括以下步骤：S1、循环水换热；S2、缓蚀阻垢电化学处理；S3、杀菌除垢处理：利用电极材料的催化氧化性能,通过电解的方式,在阴极区结垢刮垢,在阳极区产生次氯酸来杀灭菌藻；S4、连续脱盐处理：循环冷却水依据电极的电离原理分离浓水和淡水；S5、再生处理。(The invention relates to the technical field of industrial circulating water treatment, in particular to an industrial circulating water integral treatment system and a process for continuous sewage discharge and reuse, which can reduce the corrosion problem of high-concentration sewage to equipment, improve the water quality of industrial circulating water and the stability of the system, improve the water use efficiency of the industrial circulating water, reduce the sewage discharge amount, prolong the service life of the equipment and ensure that a circulating water system can run for a long time, wherein the system comprises a circulating water cooling tower, a circulating pump, a heat exchanger, an electrochemical treatment system, a sterilization and descaling system and a continuous ionization treatment system, and the process comprises the following steps: s1, exchanging heat with circulating water; s2, corrosion and scale inhibition electrochemical treatment; s3, sterilization and descaling treatment: by utilizing the catalytic oxidation performance of the electrode material, scaling and scraping are carried out in the cathode area and hypochlorous acid is generated in the anode area to kill bacteria and algae in an electrolytic mode; s4, continuous desalting treatment: the circulating cooling water separates the concentrated water and the fresh water according to the ionization principle of the electrodes; and S5, regeneration processing.)

1. The industrial circulating water integral treatment system for continuous pollution discharge and recycling is characterized by comprising a circulating water cooling tower (1), a circulating pump (2), a heat exchanger (3), an electrochemical treatment system (4), a sterilization and descaling system (5) and a continuous ionization treatment system (6), wherein the output end of the circulating water cooling tower (1) is communicated with the input end of the heat exchanger (3) through the circulating pump (2), the output end of the heat exchanger (3) is communicated with the input end of the electrochemical treatment system (4), the output end of the electrochemical treatment system (4) is communicated with the circulating water cooling tower (1), the input end and the output end of the sterilization and descaling system (5) are both communicated with the circulating water cooling tower (1) through a communicating pipeline, the input end and the output end of the continuous ionization treatment system (6) are both communicated with the circulating water cooling tower (1) through pipelines, and a sewage discharge end is arranged on the continuous ionization treatment system (6).

2. The integrated treatment process for industrial circulating water for continuous sewage discharge and reuse according to claim 1, comprising the steps of:

s1, circulating water heat exchange: cooling water in the circulating water cooling tower is pumped into the heat exchanger through the circulating pump and is used as a cold source of the heat exchanger for cooling and heat exchange in the industrial production process;

s2, corrosion and scale inhibition electrochemical treatment: the temperature-rising backwater flowing through the heat exchanger passes through an electrochemical treatment system arranged between pipelines, and the frequency and wavelength given by an external electric field are changed and controlled to perform progressive circulation on water molecules, so that water molecule groups are increased, the solubility of water to scaling salt is increased, the homodromous flocculation of scaling ions is reduced, the generation amount of scaling is reduced, meanwhile, the ultralow frequency wave can oxidize the metal surface of equipment into a compact metal oxide film by utilizing dissolved oxygen in water, and the effects of inhibiting corrosion and protecting the pipelines of the equipment are achieved;

s3, sterilization and descaling treatment: the system utilizes the over-high potential catalytic oxidation performance of an electrode material, forms a strong alkaline environment in a cathode area in an electrolysis mode, leads easily-scaling minerals to be scaled in advance, leads calcium and magnesium ions to form calcium carbonate, calcium hydroxide and magnesium hydroxide and be separated out from a water body, controls the system to start a scaling device when scaling substances grow to reach a certain thickness, and discharges the scaling substances and biological slime from a circulating water system; meanwhile, the system forms an acid environment in the anode region, and a large amount of strong oxidizing substances such as hypochlorous acid and the like are generated by reaction near the anode, so that bacteria and algae can be quickly killed, the growth of microorganisms is effectively controlled, and the effect of purifying water quality is achieved;

s4, continuous desalting treatment: according to the ionization principle of electrodes, cooling water in a circulating water cooling tower is introduced into a continuous ionization treatment system through a pipeline, concentrated water and fresh water are separated in a multi-layer electrode plate treatment mode, charged ions in the water migrate to the electrodes with opposite charges and are attached to the surfaces of the electrode plates, the concentrated water and the fresh water are separated, the separated fresh water returns to the circulating water cooling tower again, and a small amount of concentrated water is adsorbed on the electrode plates of the continuous ionization treatment system, so that the recycling of the continuously treated circulating water is realized;

s5, regeneration treatment: when the processing capacity of the continuous ionization processing system reaches a certain load, the anode and the cathode in the system are turned over, so that concentrated water attached to the periphery of the electrode plate is discharged through the sewage discharge end periodically and enters the biochemical system for further processing, and continuous sewage discharge of continuous processing circulating water is realized.

3. The integrated treatment process for industrial circulating water with continuous sewage discharge and reuse according to claim 2, wherein said electrochemical treatment system in S2 comprises a tubular electrochemical container and an external electric field.

4. The integrated treatment process for continuous sewage disposal and recycling industrial circulating water according to claim 2, wherein the electrochemical treatment system in S2 is an electrochemical container and an ultralow frequency wave device which cooperate to treat the circulating water simultaneously.

5. The integrated treatment process for industrial circulating water for continuous sewage disposal and recycling as claimed in claim 2, wherein the electrode in the sterilization and scale removal system in S3 is an oxidizing electrode.

6. The integrated treatment process for continuous sewage disposal and recycling industrial circulating water according to claim 2, wherein the operation mode of the continuous ionization treatment system in S4 is continuous operation.

7. The integrated treatment process for continuous sewage disposal and recycling industrial circulating water according to claim 2, wherein the electrode plates used in the continuous ionization treatment system in S4 are all inert electrodes.

Technical Field

The invention relates to the technical field of industrial circulating water treatment, in particular to an industrial circulating water integral treatment system and process for continuous pollution discharge and recycling.

Background

As is well known, with the rapid development of industrialization in China, the water consumption is increased year by year, and the situation of water resources is more severe day by day, especially in the water shortage areas in the northwest. In the industrial production process, the circulating cooling water is used as water consumption of industrial water, so that the improvement of the recycling rate of the circulating cooling water becomes the key point for solving the water-saving problem.

After the circulating water system is used for a long time, the phenomena of scaling, corrosion, bacterial and algae breeding and the like are inevitably caused, and the heat transfer efficiency and the service life of equipment are seriously influenced. The conventional circulating water treatment process mainly removes overhigh salt, suspended matters and other pollutants in industrial circulating water through side filtration and pollution discharge. The side filtering system can filter out more than 70% of suspended matters such as biological slime, bacterial and algal corpses and the like in water under the condition of not influencing the normal operation of a circulating water system. Blowdown and moisturizing mode adopt discontinuity blowdown and moisturizing usually, promptly: when the concentration multiple of the industrial circulating water reaches the upper limit of the control requirement, the centralized pollution discharge is started, and the centralized water supplement is adopted after the pollution discharge.

Because the circulating water is continuously evaporated in the cooling process, the salt content in the water is continuously increased, and the solution at the present stage is to increase the concentration multiple of the circulating water. The improvement of the concentration multiple of the circulating water can not only reduce the consumption of the make-up water, thereby saving water resources, but also reduce the amount of sewage, thereby reducing the pollution to the environment and the treatment capacity of the wastewater.

However, if the concentration factor is excessively increased, the hardness, alkalinity and turbidity of the circulating cooling water are increased too high, the scaling tendency of the water is greatly increased, so that the scaling control difficulty is increased, the content of corrosive ions and corrosive substances in the circulating water is increased, the corrosivity of the water is increased, the corrosion control difficulty is increased, and the retention time of a chemical in a circulating water system is increased to hydrolyze the chemical.

The intermittent centralized pollution discharge and centralized water supplement operation mode influences the stable operation of the circulating water system, and the operation is complex and is not easy to manage. Therefore, an industrial circulating water treatment system is urgently needed, and the purposes of continuous sewage discharge and recycling of circulating water are achieved under the condition that intermittent concentrated sewage discharge and concentrated water replenishing are not needed and a circulating water system stably runs.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention aims to provide an integral treatment system for industrial circulating water, which can reduce the corrosion problem of high-concentration sewage to equipment, improve the water quality of the industrial circulating water and the stability of the system, improve the water utilization efficiency of the industrial circulating water and reduce the continuous sewage discharge and the recycling of sewage discharge;

the invention also aims to provide the industrial circulating water integral treatment process which can prolong the service life of equipment and lead a circulating water system to run for a long time and realize continuous sewage discharge and recycling.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an industrial circulating water integral treatment system of continuous blowdown and retrieval and utilization, includes circulating water cooling tower, circulating pump, heat exchanger, electrochemical treatment system, the scale removal system and continuous ionization processing system disinfect, circulating water cooling tower's output and heat exchanger's input are through the circulating pump intercommunication, the heat exchanger output communicates with the electrochemical treatment system input, electrochemical treatment system output and circulating water cooling tower intercommunication, the scale removal system input and the output of disinfecting all communicate with circulating water cooling tower through the intercommunication pipeline, continuous ionization processing system input and output all communicate with circulating water cooling tower through the pipeline to be provided with the blowdown end on continuous ionization processing system.

An integral treatment process for continuous sewage discharge and reuse of industrial circulating water comprises the following steps:

s1, circulating water heat exchange: cooling water in the circulating water cooling tower is pumped into the heat exchanger through the circulating pump and is used as a cold source of the heat exchanger for cooling and heat exchange in the industrial production process;

s2, corrosion and scale inhibition electrochemical treatment: the temperature-rising backwater flowing through the heat exchanger passes through an electrochemical treatment system arranged between pipelines, and the frequency and wavelength given by an external electric field are changed and controlled to perform progressive circulation on water molecules, so that water molecule groups are increased, the solubility of water to scaling salt is increased, the homodromous flocculation of scaling ions is reduced, the generation amount of scaling is reduced, meanwhile, the ultralow frequency wave can oxidize the metal surface of equipment into a compact metal oxide film by utilizing dissolved oxygen in water, and the effects of inhibiting corrosion and protecting the pipelines of the equipment are achieved;

s3, sterilization and descaling treatment: the system utilizes the over-high potential catalytic oxidation performance of an electrode material, forms a strong alkaline environment in a cathode area in an electrolysis mode, leads easily-scaling minerals to be scaled in advance, leads calcium and magnesium ions to form calcium carbonate, calcium hydroxide and magnesium hydroxide and be separated out from a water body, controls the system to start a scaling device when scaling substances grow to reach a certain thickness, and discharges the scaling substances and biological slime from a circulating water system; meanwhile, the system forms an acid environment in the anode region, and a large amount of strong oxidizing substances such as hypochlorous acid and the like are generated by reaction near the anode, so that bacteria and algae can be quickly killed, the growth of microorganisms is effectively controlled, and the effect of purifying water quality is achieved;

s4, continuous desalting treatment: according to the ionization principle of electrodes, cooling water in a circulating water cooling tower is introduced into a continuous ionization treatment system through a pipeline, concentrated water and fresh water are separated in a multi-layer electrode plate treatment mode, charged ions in the water migrate to the electrodes with opposite charges and are attached to the surfaces of the electrode plates, the concentrated water and the fresh water are separated, the separated fresh water returns to the circulating water cooling tower again, and a small amount of concentrated water is adsorbed on the electrode plates of the continuous ionization treatment system, so that the recycling of the continuously treated circulating water is realized;

s5, regeneration treatment: when the processing capacity of the continuous ionization processing system reaches a certain load, the anode and the cathode in the system are turned over, so that concentrated water attached to the periphery of the electrode plate is discharged through the sewage discharge end periodically and enters the biochemical system for further processing, and continuous sewage discharge of continuous processing circulating water is realized.

Further, the electrochemical processing system in S2 includes a tubular electrochemical container and an applied electric field.

Further, the electrochemical treatment system in S2 is an electrochemical container and an ultra-low frequency device cooperating with each other to simultaneously treat the circulating water.

Further, the electrode in the sterilization and descaling system in S3 is an oxidizing electrode.

Further, the operation mode of the continuous ionization processing system in S4 is continuous operation.

Further, the electrode plates used in the continuous ionization processing system in S4 are all inert electrodes.

(III) advantageous effects

Compared with the prior art, the invention provides an integrated treatment system and process for industrial circulating water with continuous sewage discharge and recycling, which have the following beneficial effects:

under the condition that no medicament is added, the electrochemical treatment system combines the electrochemical property and the ultralow frequency wave, cooling water flowing out of a circulating water cooling tower flows through a heat exchanger, when the heated circulating water passes through the electrochemical treatment system, the dipole moment of the water is increased under the action of an external electric field, and the size of water molecular groups is gradually increased, so that the solubility of solid salt in the circulating water is gradually increased, the generation amount of the solid salt is restrained, and the generated ultralow frequency wave utilizes dissolved oxygen in the water to oxidize the metal surface of equipment into a compact ferroferric oxide and cuprous oxide protective film, so that the corrosion of the equipment and a pipeline is reduced, and the effects of inhibiting corrosion and scale and protecting the equipment and the pipeline are achieved;

the sterilization descaling system utilizes the over-high potential catalytic oxidation performance of electrode materials, forms a strong alkaline environment (pH is more than 9.5) in a cathode area (inner wall of a reaction chamber) in an electrolysis mode, leads mineral substances easy to scale in advance, leads calcium and magnesium ions to form calcium carbonate, calcium hydroxide and magnesium hydroxide to be separated out from a water body, controls the system to start a descaling device when the growth of scaling substances reaches a certain thickness, and discharges the scaling substances and biological slime from a circulating water system; the system forms an acid environment (pH is less than 3.5) in the anode region, and a large amount of strong oxidizing substances such as hypochlorous acid and the like are generated by reaction near the anode, so that bacteria and algae can be quickly killed, the growth of microorganisms is effectively controlled, and the effect of purifying water quality is achieved;

the continuous ionization treatment system of the invention utilizes the mutual combination characteristic between the anion and the cation under the action of the positive and negative electrodes to realize the final separation of the concentrated water and the fresh water, when the ionization treatment system is electrified, the positive and negative electrodes respectively attract the anion and the cation in the circulating cooling water to move towards the electrode plates with opposite charges, so that the ion concentration of the water flow in the middle of the electrode plates is reduced to become fresh water and flow back to the circulating water system, the water flow near the electrode plates is changed into concentrated water due to the increase of the ion concentration, when the positive and negative electrodes are turned over, the concentrated water flows out of the electrode plates and is discharged through a sewage discharge end, and the system can further adjust the current, the voltage, the size of the electrode plates and the number of units in the ionization treatment system according.

1. When the process flow of the invention is used for treating industrial circulating water, a continuous treatment operation mode is adopted, and a reservoir of a circulating water cooling tower does not need to store sewage with high concentration multiple and does not need to suspend the operation of equipment to discharge the sewage with high concentration multiple, thereby ensuring the operation quality of the equipment and prolonging the service life of the equipment;

2. when the process flow of the invention is used for treating industrial circulating water, no chemical agent is needed to be added, thereby effectively avoiding secondary pollution;

3. when the industrial circulating water is treated, the fresh water obtained by the separation of the continuous ionization treatment system returns to the circulating system, only a small amount of concentrated water is discharged, and water resources are saved;

4. when the industrial circulating water is treated by the process flow, the current, the voltage and the like of an electrochemical treatment system can be adjusted and changed, the setting conditions are controlled, and different treatment effects are achieved;

5. the process flow of the invention adopts an automatic control system when treating the industrial circulating water, has high automation degree and is fully automatically set and operated.

Drawings

FIG. 1 is a process flow diagram of the present invention;

in the drawings, the reference numbers: 1. circulating water cooling tower; 2. a circulation pump; 3. a heat exchanger; 4. an electrochemical processing system; 5. a sterilization and descaling system; 6. a continuous ionization processing system.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the system for integrally treating industrial circulating water for continuous sewage disposal and recycling of the present invention comprises a circulating water cooling tower 1, a circulating pump 2, a heat exchanger 3, an electrochemical treatment system 4, a sterilization and descaling system 5 and a continuous ionization treatment system 6, wherein an output end of the circulating water cooling tower 1 is communicated with an input end of the heat exchanger 3 through the circulating pump 2, an output end of the heat exchanger 3 is communicated with an input end of the electrochemical treatment system 4, an output end of the electrochemical treatment system 4 is communicated with the circulating water cooling tower 1, an input end and an output end of the sterilization and descaling system 5 are both communicated with the circulating water cooling tower 1 through a communication pipeline, an input end and an output end of the continuous ionization treatment system 6 are both communicated with the circulating water cooling tower 1 through pipelines, a sewage disposal end is arranged on the continuous ionization treatment system 6, the electrochemical treatment system 4 comprises, and the electrochemical treatment container and the ultralow frequency device cooperate to treat industrial circulating water, the sterilization and descaling system 5 comprises an electrochemical device, the continuous ionization treatment system 6 operates continuously, and electrode plates used in the continuous ionization treatment system 6 are inert electrodes.

The invention relates to an integral treatment process for continuous sewage discharge and reuse of industrial circulating water, which comprises the following steps:

s1, circulating water heat exchange: cooling water in the circulating water cooling tower is pumped into the heat exchanger through the circulating pump and is used as a cold source of the heat exchanger for cooling and heat exchange in the industrial production process;

s2, corrosion and scale inhibition electrochemical treatment: the temperature-rising backwater flowing through the heat exchanger passes through an electrochemical treatment system arranged between pipelines, and the frequency and wavelength given by an external electric field are changed and controlled to perform progressive circulation action on water molecules, so that water molecule groups (chains) are increased, the solubility of water to scaling salt is increased, the homodromous flocculation action of scaling ions is reduced, the generation amount of scaling is reduced, meanwhile, the ultralow frequency wave can oxidize the metal surface of equipment into a compact metal oxide film by utilizing dissolved oxygen in water, and the effects of inhibiting corrosion and protecting the pipelines of the equipment are achieved;

s3, sterilization and descaling treatment: the system utilizes the over-high potential catalytic oxidation performance of an electrode material, forms a strong alkaline environment (pH is more than 9.5) in a cathode area (inner wall of a reaction chamber) in an electrolysis mode, so that minerals easy to scale are scaled in advance, calcium and magnesium ions form calcium carbonate, calcium hydroxide and magnesium hydroxide which are separated out from a water body, and when a scaling substance grows to reach a certain thickness, the system is controlled to start a scaling device, so that the scaling substance and biological slime are discharged from a circulating water system; the system forms an acid environment (pH is less than 3.5) in the anode region, and a large amount of strong oxidizing substances such as hypochlorous acid and the like are generated by reaction near the anode, so that bacteria and algae can be quickly killed, the growth of microorganisms is effectively controlled, and the effect of purifying water quality is achieved;

s4, continuous desalting treatment: according to the ionization principle of electrodes, cooling water in a circulating water cooling tower is introduced into a continuous ionization treatment system through a pipeline, concentrated water and fresh water are separated in a multi-layer electrode plate treatment mode, charged ions in the water migrate to the electrodes with opposite charges and are attached to the surfaces of the electrode plates, the separation of the concentrated water and the fresh water is realized, the separated fresh water returns to the circulating water cooling tower again, a small amount of concentrated water is adsorbed on the electrode plates of the continuous ionization treatment system, the recycling of continuous treatment circulating water is realized, and the continuous treatment circulating water is continuously operated;

s5, regeneration treatment: when the processing capacity of the continuous ionization processing system reaches a certain load, the anode and the cathode in the system are turned over, so that concentrated water attached to the periphery of the electrode plate is discharged through the sewage discharge end periodically and enters the biochemical system for further processing, the continuous sewage discharge of continuous processing circulating water is realized, and the used electrode plates are inert electrodes.

Under the condition that no medicament is added, the electrochemical treatment system combines the electrochemical property and the ultralow frequency wave, cooling water flowing out of a circulating water cooling tower flows through a heat exchanger, when the heated circulating water passes through the electrochemical treatment system, the dipole moment of the water is increased under the action of an external electric field, and the size of water molecular groups is gradually increased, so that the solubility of solid salt in the circulating water is gradually increased, the generation amount of the solid salt is restrained, and the generated ultralow frequency wave utilizes dissolved oxygen in the water to oxidize the metal surface of equipment into a compact ferroferric oxide and cuprous oxide protective film, so that the corrosion of the equipment and a pipeline is reduced, and the effects of inhibiting corrosion and scale and protecting the equipment and the pipeline are achieved;

the sterilization and descaling treatment system utilizes the over-high potential catalytic oxidation performance of an electrode material, forms a strong alkaline environment (pH is more than 9.5) in a cathode area (inner wall of a reaction chamber) in an electrolysis mode, leads mineral substances easy to scale in advance, leads calcium and magnesium ions to form calcium carbonate, calcium hydroxide and magnesium hydroxide to be separated out from a water body, controls the system to start a scaling device when the scaling substances grow to reach a certain thickness, and discharges the scaling substances and biological slime from a circulating water system; the system forms an acid environment (pH is less than 3.5) in the anode region, and a large amount of strong oxidizing substances such as hypochlorous acid and the like are generated by reaction near the anode, so that bacteria and algae can be quickly killed, the growth of microorganisms is effectively controlled, and the water quality purification effect is achieved;

the continuous ionization treatment system of the invention utilizes the mutual combination characteristic between the anion and the cation under the action of the positive and negative electrodes to realize the final separation of the concentrated water and the fresh water, when the ionization treatment system is electrified, the positive and negative electrodes respectively attract the anion and the cation in the circulating cooling water to move towards the electrode plates with opposite charges, so that the ion concentration of the water flow in the middle of the electrode plates is reduced to become fresh water and flow back to the circulating water system, the water flow near the electrode plates is changed into concentrated water due to the increase of the ion concentration, when the positive and negative electrodes are turned over, the concentrated water flows out of the electrode plates and is discharged through a sewage discharge end, and the system can further adjust the current, the voltage, the size of the electrode plates and the number of units in the ionization treatment system according.

1. When the process flow of the invention is used for treating industrial circulating water, a continuous treatment operation mode is adopted, and a reservoir of a circulating water cooling tower does not need to store sewage with high concentration multiple and does not need to suspend the operation of equipment to discharge the sewage with high concentration multiple, thereby ensuring the operation quality of the equipment and prolonging the service life of the equipment;

2. when the process flow of the invention is used for treating industrial circulating water, no chemical agent is needed to be added, thereby effectively avoiding secondary pollution;

3. when the industrial circulating water is treated, the fresh water obtained by the separation of the continuous ionization treatment system returns to the circulating system, only a small amount of concentrated water is discharged, and water resources are saved;

4. when the industrial circulating water is treated by the process flow, the current, the voltage and the like of an electrochemical treatment system can be adjusted and changed, the setting conditions are controlled, and different treatment effects are achieved;

5. the process flow of the invention adopts an automatic control system when treating the industrial circulating water, has high automation degree and is fully automatically set and operated.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.