Experimental training device for comprehensive utilization of energy in chemical process

Abstract

The invention provides an experimental training device for comprehensive utilization of energy in a chemical process, and belongs to the technical field of teaching aids. Two groups of pipelines, namely a first main pipeline and a third main pipeline, are arranged between the cold liquid storage tank and the hot liquid storage tank, a first pump, a first heater and a third heater are sequentially arranged on the first main pipeline, and a third pump, a second heater and a fourth heater are sequentially arranged on the third main pipeline; a third pump, a fifth heater and a first cooler are sequentially arranged on the second main pipeline; a fourth pump, a sixth heater and a second cooler are sequentially arranged on the fourth main pipeline; and each main pipeline is connected with the heat exchanger through the flow conversion system. According to the invention, graduates of the chemical industry specialty are helped to deeply understand and master energy-saving knowledge of the chemical process.

Description

Technical Field

[0001] The invention provides an experimental training device for comprehensive utilization of energy in a chemical process, belonging to the technical field of teaching aids. Background Art

[0002] The comprehensive utilization of energy in chemical processes has become the most active area of ​​chemical process system optimization, and is also an important aspect of achieving energy conservation and emission reduction advocated by the country, and has gradually received great attention from various universities. In addition, in chemical plants, energy-saving technology transformation is also the easiest technical improvement to achieve, and it can usually obtain great benefits from technical transformation, and is gradually recognized by chemical companies. Summary of the invention

[0003] In order to train college chemical students to understand and apply energy conservation in chemical processes and improve their intuitive understanding of chemical energy conservation, a set of chemical practice equipment integrating design, implementation and analysis based on pinch point analysis of chemical processes was specially designed.

[0004] The specific technical solution is:

[0005] An experimental training device for comprehensive utilization of energy in a chemical process, comprising a cold liquid storage tank and a hot liquid storage tank;

[0006] There are two sets of pipes between the cold liquid storage tank and the hot liquid storage tank, which are:

[0007] The first group of pipelines includes a No. 1 main pipeline and a No. 3 main pipeline; one end of the No. 1 main pipeline and the No. 3 main pipeline are connected to the outlet of the cold liquid storage tank through a No. 1 pump and a No. 2 pump respectively; a No. 1 heater and a No. 3 heater are arranged on the No. 1 main pipeline in sequence, and a No. 2 heater and a No. 4 heater are arranged on the No. 3 main pipeline in sequence; the other ends of the No. 1 main pipeline and the No. 3 main pipeline are connected to the inlet of the hot liquid storage tank;

[0008] The second group of pipelines includes the No. 2 main pipeline and the No. 4 main pipeline; one end of the No. 2 main pipeline and the No. 4 main pipeline are connected to the outlet of the hot liquid storage tank through the No. 3 pump and the No. 4 pump respectively; the No. 5 heater and the No. 1 cooler are arranged on the No. 2 main pipeline in sequence; the No. 6 heater and the No. 2 cooler are arranged on the No. 4 main pipeline in sequence; the other ends of the No. 2 main pipeline and the No. 4 main pipeline are connected to the inlet of the cold liquid storage tank;

[0009] Main pipeline No. 1, main pipeline No. 2, main pipeline No. 3 and main pipeline No. 4 are all connected to the heat exchanger through a process conversion system.

[0010] Each heater and cooler in the device has a temperature control system.

[0011] Temperature sensors are installed at one or more locations of the cold liquid storage tank, the hot liquid storage tank, the front and rear ends of each heater, and the front and rear ends of the heat exchanger to check the temperature values ​​at necessary locations. The temperature sensors are connected to the data acquisition system.

[0012] The fluids in the No. 1 main pipeline and the No. 3 main pipeline simulate the fluids that need to be cooled in industrial production.

[0013] The fluids in the No. 2 main pipeline and the No. 4 main pipeline simulate the fluids that need to be heated in industrial production.

[0014] The fluid in the No. 1 main pipeline and the No. 3 main pipeline enters the tube side of the heat exchanger through the fluid conversion system;

[0015] The fluid in the No. 2 main pipeline and the No. 4 main pipeline enters the shell side of the heat exchanger through the fluid conversion system;

[0016] Heater No. 3 and Heater No. 6 have a heating power display function, which can be an electronic display or calculated through relevant current and voltage.

[0017] The heat exchanger is composed of two heat exchangers connected in series, and its function is to realize the regulation function of the heat exchange area of ​​the heat exchanger;

[0018] Cooler No. 1 and Cooler No. 2 have a heat exchange capacity display function, which can be displayed and replaced by the amount of tap water used;

[0019] Each type of cooler is equipped with a corresponding price list, so that the comparison between operating costs and equipment costs can be obtained according to actual conditions;

[0020] The experimental training device for comprehensive utilization of energy in a chemical process includes, but is not limited to, the following typical simulation schemes: (I) the heating amount i of the cold fluid and the cooling amount i of the hot fluid without a heat exchange process; (II) after forming a maximum heat recovery network, the heating amount ii of the cold fluid and the cooling amount ii of the hot fluid are measured; and the energy saving of the heat and cooling amounts can be obtained by comparison; (III) when a heat flow passes through the pinch point, the heating amount iii of the cold fluid and the cooling amount iii of the hot fluid are measured; and the energy change of this situation can be obtained by comparison; (IV) when a cooler is set above the pinch point of the No. 1 main pipeline, the heating amount iv of the cold fluid and the cooling amount iv of the hot fluid are measured; and the energy change of this situation can be obtained by comparison; (V) when a heater is set below the pinch point of the No. 2 main pipeline, the heating amount v of the cold fluid and the cooling amount v of the hot fluid are measured; and the energy change of this situation can be obtained by comparison; (VI) realizing the economic evaluation of heat exchanger network optimization and achieving the purpose of economic evaluation of the heat exchange network.

[0021] Through the implementation of the present invention, it can help graduates of chemical engineering majors to achieve a deep understanding and mastery of energy-saving knowledge in chemical processes, and can intuitively feel the huge economic benefits achieved by comprehensive energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a theoretical heat exchange network diagram of the simulation process of the embodiment. DETAILED DESCRIPTION

[0024] The specific technical solution of the present invention is described in conjunction with the accompanying drawings.

[0025] like Figure 1 As shown, an experimental training device for comprehensive utilization of energy in a chemical process includes a cold liquid storage tank 1 and a hot liquid storage tank 2;

[0026] There are two sets of pipes between the cold liquid storage tank 1 and the hot liquid storage tank 2, namely:

[0027] The first group of pipelines includes a No. 1 main pipeline 51 and a No. 3 main pipeline 53; one end of the No. 1 main pipeline 51 and the No. 3 main pipeline 53 are connected to the outlet of the cold liquid storage tank 1 through the No. 1 pump 31 and the No. 2 pump 32 respectively; the No. 1 main pipeline 51 is provided with a No. 1 heater 41 and a No. 3 heater 43 in sequence, and the No. 3 main pipeline 53 is provided with a No. 2 heater 42 and a No. 4 heater 44 in sequence; the other ends of the No. 1 main pipeline 51 and the No. 3 main pipeline 53 are connected to the inlet of the hot liquid storage tank 2;

[0028] The second group of pipelines includes a No. 2 main pipeline 52 and a No. 4 main pipeline 54; one end of the No. 2 main pipeline 52 and the No. 4 main pipeline 54 are connected to the outlet of the hot liquid storage tank 2 through the No. 3 pump 33 and the No. 4 pump 34 respectively; the No. 5 heater 45 and the No. 1 cooler 71 are arranged on the No. 2 main pipeline 52 in sequence; the No. 6 heater 46 and the No. 2 cooler 72 are arranged on the No. 4 main pipeline 54 in sequence; the other ends of the No. 2 main pipeline 52 and the No. 4 main pipeline 54 are connected to the inlet of the cold liquid storage tank 1;

[0029] The first main pipeline 51 , the second main pipeline 52 , the third main pipeline 53 and the fourth main pipeline 54 are all connected to the heat exchanger 6 through a process conversion system.

[0030] Among them, the hot liquid storage tank 2 should be insulated to reduce high temperature losses;

[0031] The pump is a centrifugal pump, a plunger pump, a gear pump or a combination of several of them;

[0032] The heater is an electric heater or a certain type of heat exchanger, and the heating medium of the heater can be thermal oil or steam heating;

[0033] A cooler is a certain type of heat exchanger;

[0034] The heat exchanger used in the heater or cooler may be a shell-and-tube heat exchanger, a shell-and-tube heat exchanger, a plate heat exchanger, or a combination thereof;

[0035] The heat exchanger used in the heat exchanger 6 can be a shell-and-tube heat exchanger, a shell-and-tube heat exchanger, a plate heat exchanger, or a combination of the above;

[0036] The process switching between the main line and the heat exchanger 6 can be carried out through the process conversion system, thereby realizing the heat transfer process between the cold and hot logistics.

[0037] Both the heater and the cooler have a temperature control system, which can be an automatic control system or a manual control system.

[0038] In this device, one or more temperature sensors are installed at the cold liquid storage tank 1, the hot liquid storage tank 2, the front and rear ends of each heater 16, and the front and rear ends of the heat exchanger 6 to check the temperature value at the necessary position. The temperature sensor is connected to the data acquisition system.

[0039] The process conversion system in this device can be realized by one or more methods such as series connection of three-way valves, combination of two-way valves and three-way valves, and multi-way valves;

[0040] All pipes and heat exchangers 6 must adopt necessary insulation measures.

[0041] The fluid in the No. 1 main pipeline 51 and the No. 3 main pipeline 53 simulates the fluid that needs to be cooled in industrial production.

[0042] The fluids in the No. 2 main pipeline 52 and the No. 4 main pipeline 54 simulate the fluids that need to be heated in industrial production.

[0043] The fluid in the No. 1 main pipeline 51 and the No. 3 main pipeline 53 enters the tube side of the heat exchanger through the fluid conversion system.

[0044] The fluid in the No. 2 main pipeline 52 and the No. 4 main pipeline 54 enters the shell side of the heat exchanger through the fluid conversion system.

[0045] The third heater 43 and the sixth heater 46 have a heating power display function, which is electronically displayed or calculated through relevant current and voltage.

[0046] The heat exchanger 6 is composed of two heat exchangers connected in series, and its function is to realize the regulation function of the heat exchange area of ​​the heat exchanger.

[0047] The first cooler 71 and the second cooler 72 have a heat exchange capacity display function, which is displayed and replaced by the amount of tap water used.

[0048] Each chiller is equipped with a corresponding price list, so that you can get a comparison of operating costs and equipment costs according to actual conditions.

[0049] The cold logistics of this device refers to the heated logistics process flow such as Figure 1 As shown. The specific process is described as follows: The fluid in the cold liquid storage tank 1 is transported to the No. 1 heater 41 and the No. 2 heater 42 through the No. 1 pump 31 and the No. 2 pump 32, and the fluid is heated to the specified temperature through the No. 1 heater 41 and the No. 2 heater 42. Then, the fluid passes through the No. 1 main pipeline 51 and the No. 3 main pipeline 53 and enters the No. 3 heater 43 and the No. 4 heater 44. After passing through the No. 3 heater 43 and the No. 4 heater 44, the fluid is heated to the specified temperature through the temperature control system. In this process, the energy consumed by the No. 3 heater 43 and the No. 4 heater 44 is recorded.

[0050] The cold logistics of this device refers to the heated logistics process flow such as Figure 1 As shown. The specific process is described as follows: The fluid in the cold liquid storage tank 1 is transported to the No. 1 heater 41 and the No. 2 heater 42 through the No. 1 pump 31 and the No. 2 pump 32, and the fluid is heated to the specified temperature through the No. 1 heater 41 and the No. 2 heater 42. Then, the cold and hot fluids enter the specific heat exchanger 6 through the process conversion system according to the established heat exchange method, and then enter the original main pipeline through the conversion system, and then enter the No. 3 heater 43 and the No. 4 heater 44. After passing through the No. 3 heater 43 and the No. 4 heater 44, the fluid is heated to the specified temperature. The energy consumed by the No. 3 heater 43 and the No. 4 heater 44 is recorded in the process.

[0051] The hot flow of this device refers to the cooled flow process flow such as Figure 1 As shown. The specific process is described as follows: The fluid in the hot liquid storage tank 2 is transported to the No. 5 heater 45 and the No. 6 heater 46 through the No. 3 pump 33 and the No. 4 pump 34 respectively, and the fluid is heated to a specified temperature by the No. 5 heater 45 and the No. 6 heater 46 respectively to simulate a hot flow with a specific high temperature. Then, the fluid passes through the No. 2 main pipeline 52 and the No. 4 main pipeline 54 respectively and enters the No. 1 cooler 71 and the No. 2 cooler 72. After passing through the No. 1 cooler 71 and the No. 2 cooler 72, the fluid is cooled to the specified temperature respectively. In this process, the cooling capacity consumed by the No. 1 cooler 71 and the No. 2 cooler 72 is recorded.

[0052] The hot flow of this device refers to the cooled flow process flow such as Figure 1As shown. The specific process is described as follows: The fluid in the hot liquid storage tank 2 is transported to the No. 5 heater 45 and the No. 6 heater 46 through the No. 3 pump 33 and the No. 4 pump 34, and the fluid is heated to the specified temperature through the No. 5 heater 45 and the No. 6 heater 46. Then, the hot fluid enters the specific heat exchanger 6 through the process conversion system according to the established heat exchange method, and undergoes a heat exchange process, and then enters the original main pipeline through the conversion system, and then enters the No. 1 cooler 71 and the No. 2 cooler 72. After passing through the No. 1 cooler 71 and the No. 2 cooler 72, the fluid is cooled to the specified temperature. The energy consumed by the No. 1 cooler 71 and the No. 2 cooler 72 is recorded in the process.

[0053] It is known that there are two hot streams and two cold streams in a chemical system, as shown in Table 1. Assume that the minimum allowable heat transfer temperature difference is 20°C.

[0054] Table 1 Basic parameters of the stream

[0055] Flow Starting temperature / ℃ Target temperature / ℃ Heat capacity flow rate / (kw / ℃) <![CDATA[H1]]> 160 50 0.3 <![CDATA[H2]]> 210 40 0.2 <![CDATA[C1]]> 90 170 0.4 <![CDATA[C2]]> 60 180 0.2

[0056] The theoretical heat exchange network diagram of this simulation process is as follows Figure 2 as shown.

[0057] Example 1 Simulation of the recycling network with the largest recycling volume and its economic evaluation

[0058] It is known that there are two hot streams and two cold streams in a chemical system, as shown in Table 1. Assume that the minimum allowable heat transfer temperature difference is 20°C. The maximum recovery network diagram of this process is as follows: Figure 2 shown.

[0059] First, using the experimental training device of the present invention, we can first directly adopt direct heating and cooling methods to realize the process conditions of two hot logistics and two cold logistics. The heating power of the two cold logistics is measured to be 33.2kw and 34.1kw respectively; the cooling power of the two hot logistics is measured to be 32.1kw and 24.0kw respectively.

[0060] Secondly, when the experimental training device of the present invention is used, the process conditions of two hot logistics and two cold logistics are realized by first exchanging heat between hot and cold logistics and then heating and cooling. The heating power of the two cold logistics are measured to be 0kw and 15.1kw respectively; the cooling power of the two hot logistics are measured to be 18.0kw and 8.0kw respectively.

[0061] From the above two situations, it can be seen that the use of cold-heat exchange can save both cold logistics and hot logistics, and the actual effect of energy-saving transformation can be intuitively felt.

[0062] Example 2 Simulation of the working condition when heat flows through the pinch point and its economic evaluation

[0063] It is known that there are two hot streams and two cold streams in a chemical system, as shown in Table 1. Assume that the minimum allowable heat transfer temperature difference is 20°C. The maximum recovery network diagram of this process is as follows: Figure 2 shown.

[0064] First, when the experimental training device of the present invention is used, the process conditions of two hot logistics and two cold logistics are realized by first exchanging heat between hot and cold logistics and then heating and cooling. The heating power of the two cold logistics are measured to be 0kw and 15.1kw respectively; the cooling power of the two hot logistics are measured to be 18.0kw and 8.0kw respectively.

[0065] Secondly, when the experimental device of the present invention is used, when the 2kW heat exchanger is not used, it can be found that the heating power of the heater 46 increases by about 2kW, and the cooling power of the cooler 41 also increases by about 2kW. (Due to the change of factors such as heat transfer temperature difference, there will be certain differences)

[0066] From the above two situations, it can be seen that when a certain amount of heat flows through the pinch point in the heat exchange network, the heating load and cooling load both increase by 2kW. The energy consumption change in the process of heat flowing through the pinch point can be intuitively felt. At the same time, according to the price on the heat exchanger, the economic benefits and recovery period after reducing the heat exchanger can be calculated.

[0067] Example 3 Simulation of the operating conditions when a cooler is set above the pinch point or a heater is set below the pinch point and its economic evaluation

[0068] It is known that there are two hot streams and two cold streams in a chemical system, as shown in Table 1. Assume that the minimum allowable heat transfer temperature difference is 20°C. The maximum recovery network diagram of this process is as follows: Figure 2 shown.

[0069] First, when the experimental training device of the present invention is used, the process conditions of two hot logistics and two cold logistics are realized by first exchanging heat between hot and cold logistics and then heating and cooling. The heating power of the two cold logistics are measured to be 0kw and 15.1kw respectively; the cooling power of the two hot logistics are measured to be 18.0kw and 8.0kw respectively.

[0070] When the heating power of heater 42 is increased by 2kW, it is found that the temperature of the cold stream after passing through the heat exchanger is about 190°C. At this time, it is predicted that a 2kW cooler needs to be added to the stream, which increases the equipment cost and energy consumption. Thus, the disadvantage of setting a heater below the pinch point can be intuitively felt.

[0071] The cold flow of the heat exchanger (2kw) is replaced with cooling water to simulate the situation where a cooler is installed above the pinch point. At this time, it is found that the heating load of the heater 43 increases to 17kW, which increases the equipment cost and energy consumption. Therefore, the disadvantages of installing a cooler above the pinch point can be intuitively felt.

Claims

1. An experimental training device for comprehensive utilization of energy in chemical processes, characterized in that: It comprises a cold liquid storage tank (1) and a hot liquid storage tank (2); Two groups of pipelines are arranged between the cold liquid storage tank (1) and the hot liquid storage tank (2), namely: The first group of pipelines includes a No. 1 main pipeline (51) and a No. 3 main pipeline (53); one end of the No. 1 main pipeline (51) and the No. 3 main pipeline (53) are connected to the outlet of the cold liquid storage tank (1) through a No. 1 pump (31) and a No. 2 pump (32) respectively; a No. 1 heater (41) and a No. 3 heater (43) are sequentially arranged on the No. 1 main pipeline (51), and a No. 2 heater (42) and a No. 4 heater (44) are sequentially arranged on the No. 3 main pipeline (53); the other ends of the No. 1 main pipeline (51) and the No. 3 main pipeline (53) are connected to the inlet of the hot liquid storage tank (2); The second group of pipelines includes a No. 2 main pipeline (52) and a No. 4 main pipeline (54); one end of the No. 2 main pipeline (52) and the No. 4 main pipeline (54) are connected to the outlet of the hot liquid storage tank (2) through a No. 3 pump (33) and a No. 4 pump (34) respectively; a No. 5 heater (45) and a No. 1 cooler (71) are sequentially provided on the No. 2 main pipeline (52); a No. 6 heater (46) and a No. 2 cooler (72) are sequentially provided on the No. 4 main pipeline (54); the other ends of the No. 2 main pipeline (52) and the No. 4 main pipeline (54) are connected to the inlet of the cold liquid storage tank (1); The first main pipeline (51), the second main pipeline (52), the third main pipeline (53) and the fourth main pipeline (54) are all connected to the heat exchanger (6) through a process conversion system.

2. The experimental training device for comprehensive utilization of energy in chemical process according to claim 1 is characterized in that: Each heater and cooler in the device has a temperature control system and each heat exchanger is equipped with a corresponding price list.

3. The experimental training device for comprehensive utilization of energy in chemical process according to claim 1 is characterized in that: Temperature sensors are installed at one or more locations of the cold liquid storage tank (1), the hot liquid storage tank (2), the front and rear ends of each heater, and the front and rear ends of the heat exchanger (6) to check the temperature values ​​at necessary locations. The temperature sensors are connected to the data acquisition system.

4. The experimental training device for comprehensive utilization of energy in chemical process according to claim 1 is characterized in that: The fluid in the No. 1 main pipeline (51) and the No. 3 main pipeline (53) simulates the fluid that needs to be cooled in industrial production.

5. The experimental training device for comprehensive utilization of energy in chemical process according to claim 1 is characterized in that: The fluid in the No. 2 main pipeline (52) and the No. 4 main pipeline (54) simulates the fluid that needs to be heated in industrial production.

6. The experimental training device for comprehensive utilization of energy in chemical process according to claim 1 is characterized in that: The fluid in the No. 1 main pipeline (51) and the No. 3 main pipeline (53) enters the tube side of the heat exchanger through the fluid conversion system.

7. The experimental training device for comprehensive utilization of energy in chemical process according to claim 1 is characterized in that: The fluid in the No. 2 main pipeline (52) and the No. 4 main pipeline (54) enters the shell side of the heat exchanger through the fluid conversion system.

8. The experimental training device for comprehensive utilization of energy in chemical process according to claim 1 is characterized in that: The third heater (43) and the sixth heater (46) have a heating power display function, which is an electronic display or calculated through relevant current and voltage.

9. The experimental training device for comprehensive utilization of energy in chemical process according to claim 1 is characterized in that: The heat exchanger (6) is composed of two heat exchangers connected in series, and its function is to achieve the regulation function of the heat exchange area of ​​the heat exchanger.

10. The experimental training device for comprehensive utilization of energy in chemical process according to claim 1, characterized in that: The first cooler (71) and the second cooler (72) have a heat exchange capacity display function, which is displayed and replaced by the amount of tap water used.

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