A desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization

Abstract

The utility model discloses a kind of desulfurization wastewater concentration reduction systems based on low heating energy temperature difference utilization, belong to wastewater concentration technical field, gaseous medium side of first steam-water heat exchange unit is connected with steam turbine air extraction pipeline, the liquid medium side of first steam-water heat exchange unit is communicated with one or more series flash evaporation unit by circulation pipeline, the steam turbine condensate water inlet pipeline / water supply inlet pipeline and steam turbine condensate water outlet pipeline / water supply outlet pipeline are provided in the liquid medium side of second steam-water heat exchange unit, and each flash evaporation unit generates steam turbine condensate water / water supply by passage into second steam-water heat exchange unit heating, forms "steam→desulfurization wastewater→steam turbine condensate water / water supply" heat energy transmission chain. Compared with the mode of traditional direct heating condensate water / water supply, the design realizes the secondary use of heat energy, avoids the waste of steam latent heat.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater concentration technology, and in particular to a desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization. Background Technology

[0002] In thermal power generation, turbine low-pressure heaters are commonly used to heat turbine condensate or makeup water. However, existing technologies that directly utilize turbine steam to heat turbine condensate or makeup water suffer from low thermal energy utilization. Simultaneously, the treatment of power plant desulfurization wastewater also faces challenges; traditional treatment methods often require additional energy consumption, and their treatment efficiency needs improvement. How to improve thermal energy utilization and achieve effective concentration of desulfurization wastewater without reducing the original heating effect on turbine condensate or makeup water has become a pressing technical problem in this field. Existing technologies fail to effectively combine the utilization of turbine steam's thermal energy with the concentration treatment of desulfurization wastewater, thus failing to simultaneously meet the requirements for heating turbine condensate or makeup water and concentrating desulfurization wastewater, exhibiting significant technical deficiencies. Utility Model Content

[0003] Purpose of the utility model: To provide a desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization, so as to solve the above-mentioned problems existing in the prior art.

[0004] Technical solution: A desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization, comprising: a first steam-water heat exchange unit, wherein the gaseous medium side of the first steam-water heat exchange unit is connected to a steam turbine extraction pipeline, and the liquid medium side of the first steam-water heat exchange unit is connected to one or more flash evaporation units in series through a circulation pipeline, wherein the exhaust steam generated by each flash evaporation unit provides a heat source for the corresponding second steam-water heat exchange unit through a channel, and the liquid medium side of the second steam-water heat exchange unit is provided with a steam turbine condensate inlet / makeup water inlet pipeline and a steam turbine condensate outlet / makeup water outlet pipeline.

[0005] Furthermore, the turbine extraction pipeline is a low-pressure cylinder extraction pipeline.

[0006] Furthermore, the turbine extraction pipeline is a high-pressure cylinder extraction pipeline.

[0007] Furthermore, the first steam-water heat exchange unit is equipped with a first condensate drain pipe.

[0008] Furthermore, a second condensate drain pipe is provided on the second steam-water heat exchange unit.

[0009] Furthermore, the second steam-water heat exchange unit is equipped with a vacuum extraction pipeline.

[0010] Furthermore, the circulation pipeline is equipped with a desulfurization wastewater inlet pipeline and a desulfurization wastewater outlet pipeline.

[0011] Furthermore, the flash evaporation unit and the second steam-water heat exchange unit are integrated into one structure.

[0012] Furthermore, the flash evaporation unit and the first steam-water heat exchange unit are integrated into one structure.

[0013] Furthermore, the first steam-water heat exchange unit, the flash evaporation unit, and the second steam-water heat exchange unit are integrated into a single structure.

[0014] Beneficial effects:

[0015] This application's first steam-water heat exchange unit utilizes steam from the turbine extraction pipeline to heat desulfurization wastewater. Exhaust steam generated by the flash evaporation unit enters the second steam-water heat exchange unit through a channel to heat the turbine condensate / makeup water, forming a heat transfer chain of "steam → desulfurization wastewater → exhaust steam → condensate / makeup water." Compared to the traditional method of directly heating condensate / makeup water, this design achieves secondary utilization of heat energy, avoids the waste of latent heat of steam, and expands the originally single heating process into a composite utilization mode, significantly improving the system's heat energy utilization rate while simultaneously meeting the dual requirements of desulfurization wastewater concentration and condensate / makeup water heating. Attached Figure Description

[0016] Figure 1 This is an integrated system diagram of an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of a split-type system according to Embodiment 1 of this utility model;

[0018] Figure 3 This is a schematic diagram of an integrated system according to Embodiment 2 of this utility model;

[0019] Figure 4 This is a schematic diagram of the split system of Embodiment 2 of this utility model.

[0020] The attached diagram is labeled as follows: First steam-water heat exchange unit 100, turbine extraction pipeline 110, first condensate drain pipeline 120, circulation pipeline 200, flash evaporation unit 300, channel 400, second steam-water heat exchange unit 500, turbine condensate inlet / makeup water inlet pipeline 510, turbine condensate outlet / makeup water outlet pipeline 520, second condensate drain pipeline 530, vacuum extraction pipeline 540, desulfurization wastewater inlet pipeline 600, and desulfurization wastewater outlet pipeline 700. Detailed Implementation

[0021] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0022] Example 1: As Figure 1 and Figure 2 As shown, a desulfurization wastewater concentration and reduction system based on low-heating-energy temperature difference utilization includes: a first steam-water heat exchange unit 100, the gaseous medium side of the first steam-water heat exchange unit 100 being connected to a turbine extraction pipe 110, and the liquid medium side of the first steam-water heat exchange unit 100 being connected to a flash evaporation unit 300 via a circulation pipe 200. The exhaust steam generated by the flash evaporation unit 300 provides a heat source for a second steam-water heat exchange unit 500 through a channel 400. The liquid medium side of the second steam-water heat exchange unit 500 is provided with a turbine condensate inlet / makeup water inlet pipe 510 and a turbine condensate outlet / makeup water outlet pipe 520. The turbine extraction pipe 110 is a low-pressure cylinder extraction pipe. The turbine extraction pipe 110 is also a high-pressure cylinder extraction pipe. A first condensate drain pipe 120 is provided on the first steam-water heat exchange unit 100. The second steam-water heat exchange unit 500 is equipped with a second condensate drain pipe 530. The second steam-water heat exchange unit 500 is also equipped with a vacuum extraction pipe 540. The circulation pipe 200 is equipped with a desulfurization wastewater inlet pipe 600 and a desulfurization wastewater outlet pipe 700. The flash evaporation unit 300 and the second steam-water heat exchange unit 500 are an integral structure. The flash evaporation unit 300 and the first steam-water heat exchange unit 100 are also an integral structure. The first steam-water heat exchange unit 100, the flash evaporation unit 300, and the second steam-water heat exchange unit 500 are all integral structures. A demister is installed inside the flash evaporation unit 300; the exhaust steam from the heated desulfurization wastewater after flash evaporation is treated by the demister before entering the second steam-water heat exchange unit 500.

[0023] The first steam-water heat exchange unit 100 connects to the turbine extraction pipe 110 on the gaseous medium side to receive steam extracted from the turbine (either from the low-pressure or high-pressure cylinder extraction pipe). On the liquid medium side, it connects to the flash evaporation unit 300 via a circulation pipe 200, transferring steam heat to the desulfurization wastewater and raising its temperature. This allows the desulfurization wastewater to acquire heat, creating conditions for flash evaporation concentration. Simultaneously, the steam releases heat and condenses, with the condensate discharged through the first condensate drain pipe 120, ensuring efficient heat exchange.

[0024] The turbine extraction pipe 110 serves as a steam transport channel, introducing steam from the turbine into the first steam-water heat exchange unit 100 to provide a heat source for the system. This allows the steam to participate in the heating process of the desulfurization wastewater, achieving preliminary utilization of thermal energy and meeting the system's heat requirements.

[0025] The circulation pipeline 200 connects the first steam-water heat exchange unit 100 and the flash evaporation unit 300, transporting desulfurization wastewater and allowing the wastewater to circulate between the two. The effect is to ensure that the desulfurization wastewater continuously absorbs heat through the first steam-water heat exchange unit 100, ensuring that its temperature meets the requirements of flash evaporation and laying the foundation for the concentration process.

[0026] The flash evaporation unit 300 receives heated desulfurization wastewater from the circulation pipeline 200 and concentrates the wastewater through flash evaporation to generate exhaust steam. The effect is to reduce the amount of desulfurization wastewater, thereby reducing the wastewater volume. At the same time, the generated exhaust steam can be used as a heat source for subsequent heat exchange, improving the thermal energy utilization rate.

[0027] Channel 400 transports the exhaust steam generated by flash evaporation unit 300 to the second steam-water heat exchange unit 500, providing it with a heat source. The effect is that the heat of the exhaust steam can be reused, avoiding heat waste and realizing secondary heat energy recovery.

[0028] The second steam-water heat exchange unit 500 receives the exhaust steam from channel 400. On the liquid medium side, it is equipped with a turbine condensate inlet / makeup water inlet pipe 510 and a turbine condensate outlet / makeup water outlet pipe 520, utilizing the heat from the exhaust steam to heat the condensate or makeup water. The effect is to raise the temperature of the condensate or makeup water without consuming additional energy, meeting the turbine system's water temperature requirements. Simultaneously, the water condensed from the exhaust steam is discharged through the second condensate drain pipe 530.

[0029] The turbine condensate inlet / makeup water inlet pipe 510 introduces turbine condensate or makeup water into the second steam-water heat exchange unit 500 as the heated medium. The effect is to provide the necessary fluid for the heat exchange process, allowing the condensate or makeup water to absorb heat from the exhaust steam and increase its temperature.

[0030] The turbine condensate outlet / makeup water outlet pipeline 520 discharges the heated condensate or makeup water from the second steam-water heat exchange unit 500 and delivers it to the subsequent system. The effect is to output a medium that meets the temperature requirements, satisfying the production process needs.

[0031] The first condensate drain pipe 120 discharges the condensate formed by steam condensation in the first steam-water heat exchange unit 100. This prevents condensate buildup, maintains the normal heat exchange operation of the first steam-water heat exchange unit 100, and ensures effective heat transfer.

[0032] The second condensate drain pipe 530 discharges the condensate formed by the condensation of exhaust steam in the second steam-water heat exchange unit 500. This prevents condensate buildup from affecting heat exchange efficiency and ensures the stable operation of the second steam-water heat exchange unit 500.

[0033] The vacuum extraction line 540 is connected to the second steam-water heat exchange unit 500 to create a vacuum environment inside. This lowers the boiling point of water, enhances heat exchange, promotes the condensation of exhaust steam, and improves thermal energy utilization efficiency.

[0034] The desulfurization wastewater inlet pipeline 600 is installed on the circulation pipeline 200, inputting the desulfurization wastewater to be treated into the system. Its purpose is to provide the system with a treatment target, ensuring the continuous operation of the desulfurization wastewater concentration process.

[0035] The desulfurization wastewater discharge pipeline 700 is installed on the circulation pipeline 200 to discharge the concentrated desulfurization wastewater. The effect is to discharge the treated wastewater, achieve the goal of reducing the volume of desulfurization wastewater, and reduce the burden of subsequent treatment.

[0036] The flash evaporation unit can be integrated with the second steam-water heat exchange unit, the first steam-water heat exchange unit, or all three components: the flash evaporation unit 300 can be designed as a single unit with the second steam-water heat exchange unit 500, or the first steam-water heat exchange unit 100. This design reduces the equipment footprint, simplifies piping connections, lowers heat loss, improves system compactness and heat exchange efficiency, and facilitates installation and maintenance.

[0037] Example 2: Combined with Appendix Figure 3 and attached Figure 4A desulfurization wastewater concentration and reduction system based on low-heating-energy temperature difference utilization is described, comprising: a first steam-water heat exchange unit 100, wherein the gaseous medium side of the first steam-water heat exchange unit 100 is connected to a turbine extraction pipe 110, and the liquid medium side of the first steam-water heat exchange unit 100 is connected to multiple flash evaporation units 300 connected in series via a circulation pipe 200. The exhaust steam generated by each flash evaporation unit 300 provides a heat source for a corresponding second steam-water heat exchange unit 500 through a channel 400. The liquid medium side of the second steam-water heat exchange unit 500 is provided with a turbine condensate inlet / makeup water inlet pipe 510 and a turbine condensate outlet / makeup water outlet pipe 520. The turbine extraction pipe 110 is a low-pressure cylinder extraction pipe. The turbine extraction pipe 110 is a high-pressure cylinder extraction pipe. A first condensate drain pipe 120 is provided on the first steam-water heat exchange unit 100. The second steam-water heat exchange unit 500 is equipped with a second condensate drain pipe 530. The second steam-water heat exchange unit 500 is also equipped with a vacuum extraction pipe 540. The circulation pipe 200 is equipped with a desulfurization wastewater inlet pipe 600 and a desulfurization wastewater outlet pipe 700. The flash evaporation unit 300 and the second steam-water heat exchange unit 500 are an integral structure. The flash evaporation unit 300 and the first steam-water heat exchange unit 100 are also an integral structure. The first steam-water heat exchange unit 100, the flash evaporation unit 300, and the second steam-water heat exchange unit 500 are all integral structures.

[0038] The difference between this embodiment and Embodiment 1 lies in that there are multiple flash evaporation units 300 connected in series, and they are connected to the first steam-water heat exchange unit 100 via a circulation pipeline 200. The series connection of multiple flash evaporation units 300 forms a multi-stage flash evaporation process, where the desulfurization wastewater passes through each flash evaporation unit 300 sequentially and is gradually concentrated. Compared to a single flash evaporation unit 300, the series structure increases the concentration factor of the desulfurization wastewater, further reduces the wastewater volume, improves the concentration effect, and more thoroughly achieves the wastewater reduction target.

[0039] The second difference lies in that the exhaust steam generated by each series-connected flash unit 300 provides a heat source for the corresponding second steam-water heat exchange unit 500 through channel 400. In Embodiment 2, the exhaust steam of each flash unit 300 corresponds to a separate second steam-water heat exchange unit 500. The corresponding second steam-water heat exchange unit 500 can be designed specifically according to the temperature, pressure, and other parameters of the exhaust steam from each flash unit 300, optimizing the heat exchange process. This approach allows for more efficient utilization of the heat from each stage of exhaust steam, improving the precision and overall efficiency of heat energy utilization, and resulting in a more stable heating effect for the turbine condensate or makeup water.

[0040] This embodiment employs a multi-effect process to more fully utilize the thermal energy of steam in stages. The exhaust steam generated by each flash evaporation is used to heat condensate or makeup water, reducing heat loss. Compared to Embodiment 1, it has a higher thermal energy utilization rate and, under the same steam input conditions, achieves better desulfurization wastewater concentration and condensate / makeup water heating effects, demonstrating efficient energy utilization.

[0041] Work process:

[0042] Steam is drawn from the low-pressure or high-pressure cylinder of the steam turbine by the turbine extraction line 110 and transported to the gaseous medium side of the first steam-water heat exchange unit 100. The steam releases heat in the first steam-water heat exchange unit 100, which is transferred to the desulfurization wastewater connected to the circulation line 200 via the liquid medium side, thus raising the temperature of the desulfurization wastewater. The heated desulfurization wastewater then enters the flash evaporation unit 300 via the circulation line 200, where it undergoes flash concentration to generate exhaust steam.

[0043] The exhaust steam generated by flash evaporation enters the second steam-water heat exchange unit 500 through channel 400, providing it with a heat source. At the same time, turbine condensate or makeup water enters the liquid medium side of the second steam-water heat exchange unit 500 through the turbine condensate inlet pipe / makeup water inlet pipe 510, absorbs the heat released by the exhaust steam, and its temperature rises. The heated condensate or makeup water is then discharged through the turbine condensate outlet pipe / makeup water outlet pipe 520.

[0044] In the first steam-water heat exchange unit 100, the released heat and condensed steam has its condensate discharged through the first condensate drain pipe 120; in the second steam-water heat exchange unit 500, the released heat and condensed exhaust steam has its condensate discharged through the second condensate drain pipe 530. A vacuum extraction pipe 540 maintains a vacuum environment within the second steam-water heat exchange unit 500 to lower the boiling point of water and improve heat exchange efficiency.

[0045] Desulfurization wastewater enters the circulation pipeline 200 through the desulfurization wastewater inlet pipeline 600. After circulating heating and flash concentration in the system, the concentrated desulfurization wastewater is discharged through the desulfurization wastewater outlet pipeline 700. The flash evaporation unit 300 can be designed as an integrated structure with the first steam-water heat exchange unit 100 or the second steam-water heat exchange unit 500, or all three can be integrated into one structure to optimize system performance.

[0046] The working process of Example 2 is similar to that of Example 1, except that multiple flash evaporation units 300 are connected in series. The exhaust steam generated by each flash evaporation unit 300 enters its respective second steam-water heat exchange unit 500 to heat the turbine condensate or makeup water, thereby achieving multi-effect treatment and further improving the thermal energy utilization rate and the concentration effect of desulfurization wastewater.

[0047] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization, characterized in that, include: The first steam-water heat exchange unit (100) has a gas medium side connected to a turbine extraction pipe (110), and the liquid medium side of the first steam-water heat exchange unit (100) is connected to one or more flash evaporation units (300) in series through a circulation pipe (200). The exhaust steam generated by each flash evaporation unit (300) provides a heat source for the corresponding second steam-water heat exchange unit (500) through a channel (400). The liquid medium side of the second steam-water heat exchange unit (500) is provided with a turbine condensate inlet pipe / makeup water inlet pipe (510) and a turbine condensate outlet pipe / makeup water outlet pipe (520).

2. The desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization according to claim 1, characterized in that, The turbine extraction pipeline (110) is the low-pressure cylinder extraction pipeline.

3. The desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization according to claim 1, characterized in that, The turbine extraction pipeline (110) is the high-pressure cylinder extraction pipeline.

4. The desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization according to claim 1, characterized in that, The first steam-water heat exchange unit (100) is provided with a first condensate drain pipe (120).

5. The desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization according to claim 1, characterized in that, The second steam-water heat exchange unit (500) is provided with a second condensate drain pipe (530).

6. The desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization according to claim 1, characterized in that, The second steam-water heat exchange unit (500) is equipped with a vacuum extraction pipeline (540).

7. The desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization according to claim 1, characterized in that, The circulation pipeline (200) is equipped with a desulfurization wastewater inlet pipeline (600) and a desulfurization wastewater outlet pipeline (700).

8. The desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization according to any one of claims 1-7, characterized in that, The flash evaporation unit (300) and the second steam-water heat exchange unit (500) are integrated into one structure.

9. The desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization according to any one of claims 1-7, characterized in that, The flash evaporation unit (300) and the first steam-water heat exchange unit (100) are an integral structure.

10. The desulfurization wastewater concentration and reduction system based on low heating energy temperature difference utilization according to any one of claims 1-7, characterized in that, The first steam-water heat exchange unit (100), the flash evaporation unit (300), and the second steam-water heat exchange unit (500) are integrated into one structure.

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