High-pressure adjustable injection system for waste steam recycling of sewage steam stripping device

Abstract

The utility model discloses a high-pressure adjustable injection system for waste steam recycling of a sewage steam stripping device, which comprises an adjustable steam ejector system, a steam stripping device, a steam stripping device, a steam stripping device, a steam stripping device, a steam stripping device, a steam stripping device, a steam stripping device and a steam stripping device, medium-pressure steam of 3.5-4.0 MPa is adopted as driving steam of each group of adjustable steam ejectors; each group of steam ejectors is also used for sucking redundant low-pressure steam of 0.6-0.9 MPa from a pipe network; medium-pressure steam and low-pressure steam enter the mixing chamber to serve as mixed steam, the mixed steam is pressurized to 1.2 MPa or above through the ejector to be subjected to temperature reduction adjustment, the mixed steam is conveyed to a downstream sewage steam stripping device to be used, consumption of the medium-pressure steam is reduced, part of low-pressure dead steam which is directly discharged before is utilized, energy conservation and emission reduction are completed, and the purposes of consumption reduction and efficiency improvement are achieved.

Description

Technical Field

[0001] This utility model relates to the field of steam extraction ejector systems, specifically to a high-pressure adjustable ejector system for recovering and reusing waste steam from a sewage stripping device. Background Technology

[0002] Wastewater stripping is a widely used wastewater treatment process in petrochemical plants, with steam as the carrier gas medium being the key component. Wastewater stripping involves introducing steam into the wastewater, allowing it to come into full contact with the wastewater. This causes dissolved gases and certain volatile substances in the wastewater to transfer to the gas phase, thereby removing pollutants from the water.

[0003] In existing wastewater stripping units, the steam used as the working medium needs a pressure of at least 1.2 MPa to ensure normal operation. Since the pressure of low-pressure steam and exhaust steam cannot meet the requirements, medium-pressure steam (3.5–4.0 MPa) is typically used, cooled and depressurized to 1.2 MPa by a desuperheating and pressure-reducing device before being supplied to the wastewater stripping unit. This method wastes some of the medium-pressure steam energy, resulting in high energy consumption. Furthermore, the low-pressure exhaust steam generated by the plant, lacking suitable applications, can only be discharged, further increasing energy consumption. Utility Model Content

[0004] The purpose of this invention is to provide a high-pressure adjustable injection system for recovering and reusing waste steam from a wastewater stripping device, thereby solving the following technical problems:

[0005] How can we reduce the consumption of medium-pressure steam, improve the utilization of some previously directly discharged low-pressure exhaust steam, and simultaneously achieve energy conservation and emission reduction, thereby realizing the goal of reducing consumption and increasing efficiency?

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A high-pressure adjustable injection system for recovering and reusing waste steam from a wastewater stripping unit includes:

[0008] The adjustable steam ejector system consists of two or more sets of adjustable steam ejectors arranged in parallel; the driving steam for each set of adjustable steam ejectors is medium-pressure steam of 3.5 to 4.0 MPa; each set of steam ejectors is also used to extract excess low-pressure steam of 0.6 to 0.9 MPa from the pipeline network.

[0009] The system uses actuators to input medium-pressure steam and low-pressure steam into the mixing chamber as mixed steam. The steam is then pressurized to above 1.2 MPa by an adjustable steam injector for de-temperature regulation before being delivered to the downstream wastewater stripping unit.

[0010] Preferably, each set of adjustable steam ejectors is in the power steam adjustable mode. Specifically, a pneumatic actuator is installed on one side of each set of adjustable steam ejectors to automatically adjust the flow rate of driving steam according to the exhaust steam flow rate, with an operating flexibility range of 60% to 120%.

[0011] Preferably, each adjustable steam ejector outlet is equipped with a water spray desuperheating device for desuperheating regulation, controlling the exhaust outlet temperature between 240 and 280°C.

[0012] Preferably, the adjustable steam ejector system and a set of desuperheating and pressure reducing devices are connected in parallel.

[0013] Preferably, the adjustable steam ejector system further includes:

[0014] The pressure transmitter is installed on the outlet pipeline of the adjustable steam ejector and is interlocked with the actuator of the adjustable steam ejector to control the actuator opening and adjust the flow rate to meet flexible working requirements. The flexibility range is controlled between 60% and 120%.

[0015] The temperature transmitter is installed on the outlet pipeline of the adjustable steam ejector to monitor the gas temperature of each pipeline and to control the adjustment of the desuperheating water volume based on the exhaust port temperature.

[0016] Preferably, a regulating valve is installed on the desuperheating water inlet pipe of the desuperheating device, and the temperature transmitter is interlocked with the regulating valve to automatically adjust the flow rate according to the exhaust port temperature.

[0017] Preferably, it further includes:

[0018] Flow meters are installed on both medium-pressure steam and excess low-pressure steam pipelines for remote transmission to the control system for online monitoring.

[0019] The beneficial effects of this utility model are as follows: This utility model, through its design, achieves a highly adaptable and energy-saving adjustable injection system that is stable, reliable, flexibly adjustable, and suitable for various working conditions. It can meet the needs of continuous operation of a low-pressure exhaust steam recovery and reuse system, enabling the recovery of unstable low-pressure exhaust steam and its subsequent pressurization to stable medium-pressure steam for reuse, thereby achieving energy-saving effects. It automatically switches according to changes in working conditions, adapting to various conditions, recovering low-pressure steam, and saving energy. Specifically:

[0020] 1. Excess pipeline steam is drawn in, mixed, and pressurized by an ejector and then transported to the sewage gas lift device to achieve heat energy recovery;

[0021] 2. Medium-pressure steam is used as the driving medium, without direct temperature and pressure reduction, and energy is recovered by utilizing pressure energy; and an adjustable steam ejector is used to achieve flexible system operation;

[0022] 3. The steam ejector outlet is equipped with a desuperheating device to control the discharged steam and provide a suitable temperature for downstream equipment;

[0023] 4. Multiple sets of adjustable steam ejectors are used to meet the demand for large-flow excess steam discharge;

[0024] 5. Connect a parallel cooling and pressure reducing device to supplement the system's flow demand;

[0025] 7. Equipped with an automated control system to achieve automatic flow adjustment.

[0026] Of course, any product implementing this utility model does not necessarily need to achieve all the advantages described above at the same time. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a process flow diagram of a high-pressure adjustable injection system for waste steam recovery and reuse in a wastewater stripping device according to this utility model.

[0029] Figure 2 This is a configuration diagram of a high-pressure adjustable injection system for waste steam recovery and reuse in a wastewater stripping device according to this utility model. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] The following three problems exist in the actual use of waste steam recovery systems:

[0032] Question 1: How to recover excess pipeline steam for use in wastewater stripping units;

[0033] Question 2: How to adapt to large-flow-rate steam recovery under varying operating conditions;

[0034] Question 3: How to stabilize the steam discharge pressure at 1.2 MPa?

[0035] To resolve the above issues, please refer to Figure 1-2As shown, this utility model is a high-pressure adjustable injection system for recovering and reusing waste steam from a wastewater stripping device, comprising:

[0036] The adjustable steam ejector system consists of two or more sets of adjustable steam ejectors arranged in parallel; the driving steam for each set of adjustable steam ejectors is medium-pressure steam of 3.5 to 4.0 MPa; each set of steam ejectors is also used to extract excess low-pressure steam of 0.6 to 0.9 MPa from the pipeline network.

[0037] The system uses actuators to input medium-pressure steam and low-pressure steam into the mixing chamber as mixed steam. The steam is then pressurized to above 1.2 MPa by an adjustable steam injector for de-temperature regulation before being delivered to the downstream wastewater stripping unit.

[0038] In the above technical solution, the system is composed of two or more sets of adjustable steam ejectors, each set connected in parallel. Each set of ejectors uses medium-pressure steam of 3.5-4.0 MPa to drive the steam, drawing in excess low-pressure steam of 0.6-0.9 MPa from the pipeline network. The steam is then pressurized by the ejector to above 1.2 MPa and discharged to the downstream wastewater stripping unit, thus solving the problem of steam waste. The parallel mode of multiple sets can adapt to the condition of large-flow waste steam recovery and meet the demand for large-flow excess steam discharge. The adjustable steam ejector system ensures that excess pipeline steam is drawn in, mixed, and pressurized by the ejector before being delivered to the wastewater stripping unit, realizing heat energy recovery. Furthermore, medium-pressure steam is used as the driving medium, without direct de-temperature and de-pressure reduction, ensuring the utilization of pressure energy for energy recovery.

[0039] By designing and implementing a highly adaptable and energy-saving adjustable injection system that is stable, reliable, flexible, and suitable for various working conditions, this system can meet the needs of continuous operation of the low-pressure exhaust steam recovery and reuse system. It can recover unstable low-pressure exhaust steam and then pressurize it to stable medium-pressure steam for reuse, thereby achieving energy-saving effects. It can automatically switch as the working conditions change, adapt to various working conditions, recover low-pressure steam, and save energy.

[0040] As one embodiment of this utility model, each set of adjustable steam ejectors is in the power steam adjustable mode, and each set of adjustable steam ejectors is equipped with a pneumatic actuator on one side, which automatically adjusts the flow rate of driving steam according to the exhaust steam flow rate, with an operational flexibility range of 60% to 120%.

[0041] In the above technical solution, each group of ejectors is a power steam adjustable mode, that is, an adjustable steam ejector, and each group of adjustable steam ejectors is equipped with a pneumatic actuator to automatically adjust the flow rate of driving steam according to the exhaust steam flow rate. By using such adjustable steam ejectors, the system can operate flexibly; and the pneumatic actuator has an operating flexibility range of 60% to 120%, achieving the best suction effect and saving driving steam.

[0042] As one embodiment of this utility model, each adjustable steam ejector outlet is equipped with a water spray de-heating device for de-heating regulation, controlling the exhaust outlet temperature between 240 and 280°C.

[0043] In the above technical solution, each group of ejectors is equipped with a water spray desuperheating device at the outlet to control the exhaust temperature between 240 and 280°C to meet the actual needs of the downstream sewage stripping unit; and each steam ejector outlet is equipped with a water spray desuperheating device to control the discharged steam to provide a suitable temperature for the downstream unit.

[0044] In one embodiment of this utility model, the adjustable steam ejector system and a set of desuperheating and depressurization devices are connected in parallel.

[0045] In the above technical solution, a desuperheating and pressure reducing device is connected in parallel to supplement the system's flow demand; the adjustable steam ejector system and a set of desuperheating and pressure reducing devices are connected in parallel, which can meet the downstream unit's demand for a large steam flow of 1.2MPa.

[0046] As one embodiment of this utility model, the adjustable steam ejector system further includes:

[0047] The pressure transmitter is installed on the outlet pipeline of the adjustable steam ejector and is interlocked with the actuator of the adjustable steam ejector to control the actuator opening and adjust the flow rate to meet flexible working requirements. The flexibility range is controlled between 60% and 120%.

[0048] Temperature transmitters are installed on the outlet pipeline of adjustable steam ejectors to monitor the gas temperature of each pipeline and to control the desuperheating water flow rate based on the exhaust temperature.

[0049] A regulating valve is installed on the desuperheating water inlet pipe of the desuperheating device. This regulating valve is interlocked with the temperature transmitter and automatically adjusts the flow rate according to the exhaust port temperature.

[0050] In the above technical solution, a pressure transmitter, a temperature transmitter, and a pneumatic regulating valve are installed in the adjustable steam ejector system to achieve interlocked control. Specifically, the pressure transmitter installed on the outlet pipeline of the adjustable steam ejector is interlocked with the actuator of the adjustable steam ejector to control the opening of the actuator and thus regulate the flow rate. The temperature transmitter installed on the outlet pipeline of the adjustable steam ejector is usually installed after the pressure transmitter to monitor the gas temperature of each pipeline and to control the adjustment of the desuperheating water flow rate based on the exhaust temperature. A regulating valve is also installed on the desuperheating water inlet pipeline of the desuperheating device. This regulating valve is interlocked with the temperature transmitter and automatically adjusts the flow rate based on the temperature measured at the exhaust port.

[0051] As one embodiment of this utility model, it also includes:

[0052] Flow meters are installed on both medium-pressure steam and excess low-pressure steam pipelines for remote transmission to the control system for online monitoring.

[0053] The above technical solution utilizes an automated control system to achieve automatic flow adjustment.

[0054] During the operation of this system:

[0055] Please see Figure 1 As shown, firstly, medium-pressure steam of 3.5–4.0 MPa is used as the driving steam and enters the nozzle of the adjustable steam ejector. After passing through the nozzle, a high-speed jet is formed. Flow meters are installed on the medium-pressure steam and excess low-pressure steam pipelines, and the data is transmitted to the control system for online monitoring. The excess low-pressure steam of 0.6–0.9 MPa is drawn into the mixing chamber of the adjustable steam ejector. Then, the two fluids are mixed and pressurized to above 1.2 MPa by the adjustable steam ejector before entering the desuperheating device. The desuperheating device reduces the temperature of the mixed steam to between 240 and 280°C before discharge. Subsequently, the mixed steam enters the downstream wastewater stripping unit for utilization. A pressure transmitter is installed on the outlet pipe of the adjustable steam ejector and interlocked with the actuator of the adjustable steam ejector to control the actuator opening. The flow rate is adjusted according to the opening size to meet flexible operating requirements, with the flexibility range controlled between 60% and 120%. A temperature transmitter is installed on the outlet pipe of the adjustable steam ejector, and a regulating valve is installed on the desuperheating water inlet pipe of the desuperheating device. The temperature transmitter and the regulating valve are interlocked to automatically adjust the flow rate according to the exhaust port temperature. According to the discharge requirements of excess low-pressure steam, the corresponding number of adjustable steam ejectors are selected. According to the engineering requirements of the downstream sewage stripping unit, the bypass desuperheating and pressure reducing device can be opened simultaneously for parallel operation to meet the actual steam demand of the downstream.

[0056] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the embodiments of apparatus, devices, and non-volatile computer storage media are basically similar to the method embodiments, so the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0057] The above content is merely an example and illustration of the concept of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the utility model or exceed the scope defined in this application, they should all fall within the protection scope of this utility model.

Claims

1. A high-pressure adjustable injection system for recovering and reusing waste steam from a wastewater stripping device, characterized in that, include: The adjustable steam ejector system consists of two or more sets of adjustable steam ejectors arranged in parallel; the driving steam for each set of adjustable steam ejectors is medium-pressure steam of 3.5 to 4.0 MPa; each set of steam ejectors is also used to extract excess low-pressure steam of 0.6 to 0.9 MPa from the pipeline network. The system uses actuators to input medium-pressure steam and low-pressure steam into the mixing chamber as mixed steam. The steam is then pressurized to above 1.2 MPa by an adjustable steam injector for de-temperature regulation before being delivered to the downstream wastewater stripping unit.

2. The high-pressure adjustable injection system for waste steam recovery and reuse in a wastewater stripping device according to claim 1, characterized in that, Each set of adjustable steam injectors is in a power steam adjustable mode.

3. The high-pressure adjustable injection system for waste steam recovery and reuse in a wastewater stripping device according to claim 2, characterized in that, Each set of adjustable steam ejector outlets is equipped with a water spray de-heating device for de-heating regulation, controlling the exhaust outlet temperature between 240 and 280°C.

4. The high-pressure adjustable injection system for waste steam recovery and reuse in a wastewater stripping device according to claim 3, characterized in that, The adjustable steam ejector system is connected in parallel with a set of desuperheating and pressure reducing devices.

5. The high-pressure adjustable injection system for waste steam recovery and reuse in a wastewater stripping device according to claim 4, characterized in that, The adjustable steam ejector system also includes: The pressure transmitter is installed on the outlet pipeline of the adjustable steam ejector and is interlocked with the actuator of the adjustable steam ejector to control the actuator opening and adjust the flow rate to meet flexible working requirements. The flexibility range is controlled between 60% and 120%. The temperature transmitter is installed on the outlet pipeline of the adjustable steam ejector to monitor the gas temperature of each pipeline and to control the adjustment of the desuperheating water volume based on the exhaust port temperature.

6. The high-pressure adjustable injection system for waste steam recovery and reuse in a wastewater stripping device according to claim 5, characterized in that, A regulating valve is installed on the desuperheating water inlet pipe of the water spray desuperheating device. The temperature transmitter is interlocked with the regulating valve and automatically adjusts the flow rate according to the exhaust port temperature.

7. The high-pressure adjustable injection system for waste steam recovery and reuse in a wastewater stripping device according to claim 1, characterized in that, Also includes: Flow meters are installed on both medium-pressure steam and excess low-pressure steam pipelines for remote transmission to the control system for online monitoring.

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