Chemical industry waste heat condensate grading recycling device

Abstract

The utility model relates to a kind of chemical waste heat condensate fractional recovery and recycling device, including multiple different steam pressure steam delivery main pipe, multiple steam delivery main pipe is sequentially spaced according to steam pressure from high to low order, one steam delivery main pipe with higher steam pressure is connected and communicated with adjacent and one steam delivery main pipe with lower steam pressure by drain line, one steam delivery main pipe with lowest steam pressure is connected and communicated with deaerator by heat exchange line, first trap, first pressure gauge, multiple first stop valve and desalted water heat exchanger are equipped on the heat exchange line, second trap, second pressure gauge and multiple second stop valve are equipped on the drain line.The utility model relates to a kind of chemical waste heat condensate fractional recovery and recycling device, can provide power for the steam delivery main pipe in next stage, can also carry out step-by-step recovery to steam condensate of different pressure grades, not waste emission, eliminate working medium loss.

Description

Technical Field

[0001] This utility model relates to the field of chemical waste heat condensate recovery technology, specifically to a graded recovery and reuse device for chemical waste heat condensate. Background Technology

[0002] Waste heat steam, as a clean and safe energy carrier, is widely used in various industries, such as power generation, petroleum, chemical, printing and dyeing, papermaking, textiles, brewing, rubber, and ceramics. After releasing its latent heat of vaporization in various steam-using equipment, steam becomes saturated condensate at nearly the same temperature and pressure. Because the operating pressure of steam is greater than atmospheric pressure, the condensate contains 20% to 30% of the total heat of the steam. Furthermore, low-temperature, low-pressure steam has a wide range of applications, and its effective utilization has the potential for energy saving and consumption reduction. Industrial sectors widely use steam for power generation, heating, drying, insulation, and warmth. However, most enterprises only use steam as an energy source once. After the steam forms condensate, it is discharged as waste or released into the open air, resulting in a significant waste of energy and water resources and environmental pollution.

[0003] The existing low-pressure steam pipelines (4.0MPa, 2.1MPa, 1.0MPa, and 0.5MPa) in the chemical industrial park are not recovering condensate. The waste heat condensate from these unrecovered steam pipelines amounts to approximately 20 tons per hour (for a 5-month heating season). 20 tons per hour * 100 tons = 2000 yuan / hour * 24 hours = 48000 yuan * 150 yuan = 7.2 million yuan (cost: 1 ton = 100 yuan). During the heating season, the steam-water mixture is directly discharged daily through the steam traps. This waste heat condensate cannot be effectively utilized and is wasted. Utility Model Content

[0004] In order to solve one or more technical problems existing in the prior art, this utility model provides a graded recovery and reuse device for chemical waste heat condensate.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: This utility model provides a graded recovery and reuse device for chemical waste heat condensate, including multiple main steam conveying pipelines with different steam pressures. The multiple main steam conveying pipelines are arranged in sequence from high to low steam pressure. The main steam conveying pipeline with higher steam pressure is connected to the adjacent main steam conveying pipeline with lower steam pressure through a condensate drain pipe. The main steam conveying pipeline with the lowest steam pressure is connected to a deaerator through a heat exchange pipe. The heat exchange pipe is equipped with a first condensate drain, a first pressure gauge, multiple first shut-off valves and a demineralized water heat exchanger. The condensate drain pipe is equipped with a second condensate drain, a second pressure gauge and multiple second shut-off valves.

[0006] The beneficial effects of this utility model are: the chemical waste heat condensate graded recovery and reuse device of this utility model can provide power for the next stage of steam transmission main pipeline, and can also recover steam condensate of different pressure levels step by step, without waste discharge and eliminating working fluid loss.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, liquid collection tanks are installed on multiple main steam transmission pipelines with different steam pressures, and the liquid collection tanks of each main steam transmission pipeline are located upstream of the connected condensate pipes or heat exchange pipes.

[0009] Furthermore, multiple main steam transmission pipelines with different steam pressures are connected to corresponding condensate pipes and heat exchange pipes and then merged into the corresponding main steam pipeline with the corresponding steam pressure.

[0010] Furthermore, multiple main steam transmission pipelines with different steam pressures are built in the air. The drainage pipeline has a U-shaped structure, with a section of the drainage pipeline at the bottom of the U-shaped structure located on the ground. The section of the drainage pipeline at the bottom of the U-shaped structure is equipped with a second steam trap, a second pressure gauge, and two second shut-off valves. The two second shut-off valves are located on both sides of the second steam trap and the second pressure gauge, respectively.

[0011] The advantages of adopting the above-mentioned further solution are: by setting a section of the drainage pipe at the bottom of the U-shaped structure on the ground, and installing a second drain valve, a second pressure gauge and two second shut-off valves, installation and maintenance are facilitated.

[0012] Furthermore, in the same U-shaped drainage pipeline, two second shut-off valves are provided on the section of the pipeline that is connected to a main steam transmission pipeline with higher steam pressure and located above ground, and one second shut-off valve is provided on the section of the pipeline that is connected to a main steam transmission pipeline with lower steam pressure and located above ground.

[0013] Furthermore, the heat exchange pipeline has an L-shaped structure, with the horizontal section of the L-shaped structure located on the ground. The horizontal section of the L-shaped structure is equipped with a first steam trap, a first pressure gauge, a demineralized water heat exchanger, and three first shut-off valves. A first shut-off valve is provided on each side of the first steam trap and the first pressure gauge. A first shut-off valve is provided between the demineralized water heat exchanger and the deaerator.

[0014] The advantages of adopting the above-mentioned further scheme are: by setting the first steam trap, the first pressure gauge, the demineralized water heat exchanger and the three first shut-off valves on the ground, maintenance and management are facilitated.

[0015] Furthermore, two first shut-off valves are installed on a section of the heat exchange pipeline located above ground.

[0016] Furthermore, the main steam transmission pipeline is configured as four pipelines, the drain pipeline is configured as three pipelines, and the heat exchange pipeline is configured as one pipeline.

[0017] Furthermore, the four main steam transmission pipelines are a 4.0 MPa main steam pipeline, a 2.3 MPa main steam pipeline, a 1.0 MPa main steam pipeline, and a 0.5 MPa main steam pipeline. The 4.0 MPa main steam pipeline is connected to the 2.3 MPa main steam pipeline via a first drain pipe, the 2.3 MPa main steam pipeline is connected to the 1.0 MPa main steam pipeline via a second drain pipe, and the 1.0 MPa main steam pipeline is connected to the 0.5 MPa main steam pipeline via a third drain pipe.

[0018] Furthermore, a check valve is also installed on the heat exchange pipeline upstream of the deaerator.

[0019] The beneficial effect of adopting the above-mentioned further solution is to prevent backflow of steam and water from the deaerator.

[0020] The advantages of this utility model's graded recovery and reuse device for chemical waste heat condensate are mainly reflected in energy utilization, cost control, and system stability, as detailed below: (1) Improve energy utilization: Steam condensate of different pressure levels (4.0MPa, 2.3MPa, 1.0MPa, 0.5MPa) is recycled to the corresponding pressure steam pipeline according to the level, avoiding the energy loss caused by direct discharge of high pressure condensate or connection to low pressure system, so that the thermal energy and pressure energy of steam can be fully utilized.

[0021] (2) Reduce energy waste: Through graded recycling, the direct discharge of steam condensate at each pressure level is eliminated, minimizing the waste of steam and its latent heat, which meets the requirements of energy conservation and consumption reduction.

[0022] (3) Reduced operating costs: Increased energy efficiency means that it is not necessary to consume too much extra energy to make up for lost heat or pressure, thereby reducing fuel consumption and related operating costs.

[0023] (4) Stabilize system pressure: Connect the corresponding steam pipelines according to the pressure level to avoid the impact on the system when fluids of different pressures are mixed, which helps to maintain the stability of the pressure of each steam pipeline and ensure the smooth operation of the system.

[0024] (5) Easy to monitor and maintain: Installing a pressure gauge after the steam trap allows for a direct assessment of whether the steam trap is in normal operation, facilitating timely detection and handling of equipment failures, and reducing energy waste and system failures caused by equipment problems. Attached Figure Description

[0025] Figure 1This is a schematic diagram of the connection structure of the chemical waste heat condensate graded recovery and reuse device of this utility model.

[0026] The attached diagram lists the components represented by each number as follows: 1. 4.0 MPa main steam pipeline; 11. 4.0 MPa main steam network; 2. 2.3 MPa main steam pipeline; 2.1 2.3 MPa main steam network; 3. 1.0 MPa main steam pipeline; 31. 1.0 MPa main steam network; 4. 0.5 MPa main steam pipeline; 41. 0.5 MPa main steam network; 5. First drain pipe; 51. Second drain pipe; 52. Third drain pipe; 53. Second drain valve; 54. Second shut-off valve; 6. Heat exchange piping; 61. First steam trap; 62. First shut-off valve; 63. Demineralized water heat exchanger; 64. Check valve; 7. Deaerator; 8. Inspection valve. Detailed Implementation

[0027] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0028] Example 1 like Figure 1 As shown, this embodiment of a chemical waste heat condensate graded recovery and reuse device includes multiple main steam transmission pipelines with different steam pressures. The multiple main steam transmission pipelines are arranged in sequence from high to low steam pressure. The main steam transmission pipeline with higher steam pressure is connected to the adjacent main steam transmission pipeline with lower steam pressure through a condensate drain pipe. The main steam transmission pipeline with the lowest steam pressure is connected to the deaerator 7 through a heat exchange pipe. The heat exchange pipe is equipped with a first condensate drain 61, a first pressure gauge, multiple first shut-off valves 62, and a demineralized water heat exchanger 63. The condensate drain pipe is equipped with a second condensate drain 53, a second pressure gauge, and multiple second shut-off valves 54.

[0029] like Figure 1 As shown, in one specific embodiment, a liquid collection bag is provided on each of the multiple main steam conveying pipelines with different steam pressures. The liquid collection bag of each main steam conveying pipeline is located upstream of the connected condensate pipe or heat exchange pipe 6.

[0030] like Figure 1 As shown, in one specific embodiment, multiple main steam transport pipelines with different steam pressures are connected to corresponding condensate pipes and heat exchange pipes 6 and then merged into the corresponding main steam pipeline with the corresponding steam pressure.

[0031] like Figure 1 As shown, in one specific embodiment, a check valve 64 is also provided on the heat exchange pipeline 6 upstream of the deaerator 7 to prevent backflow of steam and water from the deaerator.

[0032] Specifically, such as Figure 1 As shown, each drainage pipe in this embodiment is equipped with a maintenance valve 8.

[0033] This embodiment of a chemical waste heat condensate graded recovery and reuse device can provide power for the next stage of steam transmission main pipeline, and can also recover steam condensate of different pressure levels step by step, without waste discharge and eliminating working fluid loss.

[0034] Example 2 Based on Embodiment 1, this embodiment provides a preferred structural configuration for the hydrophobic pipe and the heat exchange pipe 6. For example... Figure 1 As shown, multiple main steam transport pipelines with different steam pressures are erected in the air. The condensate drain pipe has a U-shaped structure, with a section of the drain pipe at the bottom of the U-shape located on the ground. This section of the drain pipe at the bottom of the U-shape is equipped with a second steam trap 53, a second pressure gauge, and two second shut-off valves 54. The two second shut-off valves 54 are located on either side of the second steam trap 53 and the second pressure gauge, respectively. By placing a section of the drain pipe at the bottom of the U-shape on the ground and installing the second steam trap, second pressure gauge, and two second shut-off valves, installation and maintenance are facilitated.

[0035] like Figure 1 As shown, in the same U-shaped drainage pipeline of this embodiment, two second shut-off valves 54 are provided on a section of the pipeline that is connected to a main steam transmission pipeline with higher steam pressure and located above the ground, and one second shut-off valve 54 is provided on a section of the pipeline that is connected to a main steam transmission pipeline with lower steam pressure and located above the ground.

[0036] like Figure 1 As shown, in a preferred embodiment, the heat exchange pipeline 6 has an L-shaped structure. The horizontal section of the L-shaped structure is located on the ground. The horizontal section of the L-shaped structure is equipped with a first steam trap 61, a first pressure gauge, a demineralized water heat exchanger 63, and three first shut-off valves 62. A first shut-off valve 62 is located on each side of the first steam trap 61 and the first pressure gauge. A first shut-off valve 62 is located between the demineralized water heat exchanger 63 and the deaerator 7. By placing the first steam trap, the first pressure gauge, the demineralized water heat exchanger, and the three first shut-off valves on the ground, maintenance and management are facilitated.

[0037] like Figure 1As shown, in one specific embodiment, two first shut-off valves 62 are provided on a section of heat exchange pipeline 6 located above ground.

[0038] like Figure 1 As shown, in a preferred embodiment, a maintenance valve 8 is installed on the section of each drainage pipe located on the ground, and a maintenance valve 8 is also installed on the section of the heat exchange pipe 6 located on the ground, to facilitate inspection and maintenance.

[0039] Example 3 Based on any of the above embodiments, this embodiment provides a specific scheme for a graded recovery and reuse device for chemical waste heat condensate. For example... Figure 1 As shown, the main steam transmission pipeline is configured as four lines, the drain pipeline is configured as three lines, and the heat exchange pipeline 6 is configured as one line.

[0040] Specifically, such as Figure 1 As shown, the four main steam transmission pipelines are a 4.0 MPa main steam pipeline 1, a 2.3 MPa main steam pipeline 2, a 1.0 MPa main steam pipeline 3, and a 0.5 MPa main steam pipeline 4. The 4.0 MPa main steam pipeline 1 is connected to the 2.3 MPa main steam pipeline 2 via a first drain pipe 5. The 2.3 MPa main steam pipeline 2 is connected to the 1.0 MPa main steam pipeline 3 via a second drain pipe 51. The 1.0 MPa main steam pipeline 3 is connected to the 0.5 MPa main steam pipeline 4 via a third drain pipe 52. The steam main pipeline includes a 4.0 MPa steam main network 11, a 2.3 MPa steam main network 21, a 1.0 MPa steam main network 31, and a 0.5 MPa steam main network 41; the 4.0 MPa steam main pipeline 1, the 2.3 MPa steam main pipeline 2, the 1.0 MPa steam main pipeline 3, and the 0.5 MPa steam main pipeline 4 are respectively connected to the 4.0 MPa steam main network 11, the 2.3 MPa steam main network 21, the 1.0 MPa steam main network 31, and the 0.5 MPa steam main network 41.

[0041] In the description of this utility model, it should be understood that the terms "upstream", "downstream", "vertical", "lateral", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A graded recovery and reuse device for chemical waste heat condensate, characterized in that, It includes multiple main steam transmission pipelines with different steam pressures, which are arranged in sequence from high to low steam pressure. The main steam transmission pipeline with higher steam pressure is connected to the adjacent main steam transmission pipeline with lower steam pressure through a condensate drain pipe. The main steam transmission pipeline with the lowest steam pressure is connected to the deaerator through a heat exchange pipe. The heat exchange pipe is equipped with a first condensate drain, a first pressure gauge, multiple first shut-off valves, and a demineralized water heat exchanger. The condensate drain pipe is equipped with a second condensate drain, a second pressure gauge, and multiple second shut-off valves.

2. The chemical waste heat condensate staged recovery and reuse device according to claim 1, characterized in that, Liquid collection tanks are installed on multiple main steam transmission pipelines with different steam pressures. The liquid collection tank of each main steam transmission pipeline is located upstream of the connected condensate pipe or heat exchange pipe.

3. The chemical waste heat condensate staged recovery and reuse device according to claim 1, characterized in that, Multiple main steam pipelines with different steam pressures are connected to corresponding condensate pipes and heat exchange pipes and then merged into the corresponding main steam pipeline with the corresponding steam pressure.

4. The chemical waste heat condensate staged recovery and reuse device according to claim 1, characterized in that, Multiple main steam transport pipelines with different steam pressures are built in the air. The drainage pipeline has a U-shaped structure. A section of the drainage pipeline at the bottom of the U-shaped structure is located on the ground. A second steam trap, a second pressure gauge, and two second shut-off valves are installed on the section of the drainage pipeline at the bottom of the U-shaped structure. The two second shut-off valves are located on both sides of the second steam trap and the second pressure gauge, respectively.

5. The chemical waste heat condensate staged recovery and reuse device according to claim 4, characterized in that, In the same U-shaped drainage pipeline, two second shut-off valves are installed on a section of the pipeline that is connected to a main steam transmission pipeline with higher steam pressure and located above ground, and one second shut-off valve is installed on a section of the pipeline that is connected to a main steam transmission pipeline with lower steam pressure and located above ground.

6. The chemical waste heat condensate staged recovery and reuse device according to claim 4, characterized in that, The heat exchange pipeline has an L-shaped structure. The horizontal section of the L-shaped structure is located on the ground. The horizontal section of the L-shaped structure is equipped with a first steam trap, a first pressure gauge, a demineralized water heat exchanger, and three first shut-off valves. A first shut-off valve is provided on each side of the first steam trap and the first pressure gauge. A first shut-off valve is provided between the demineralized water heat exchanger and the deaerator.

7. The chemical waste heat condensate staged recovery and reuse device according to claim 6, characterized in that, Two first shut-off valves are installed on a section of heat exchange pipeline located above ground.

8. The chemical waste heat condensate staged recovery and reuse device according to claim 1, characterized in that, The main steam transmission pipeline is configured as four lines, the drainage pipeline is configured as three lines, and the heat exchange pipeline is configured as one line.

9. The chemical waste heat condensate staged recovery and reuse device according to claim 8, characterized in that, The four main steam transmission pipelines are a 4.0 MPa main steam pipeline, a 2.3 MPa main steam pipeline, a 1.0 MPa main steam pipeline, and a 0.5 MPa main steam pipeline. The 4.0 MPa main steam pipeline is connected to the 2.3 MPa main steam pipeline via a first drain pipe. The 2.3 MPa main steam pipeline is connected to the 1.0 MPa main steam pipeline via a second drain pipe. The 1.0 MPa main steam pipeline is connected to the 0.5 MPa main steam pipeline via a third drain pipe.

10. The chemical waste heat condensate staged recovery and reuse device according to claim 1, characterized in that, A check valve is also installed on the heat exchange pipeline upstream of the deaerator.

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