In 2011, Dazhou Company invested a large amount of environmental protection funds to carry out technical transformation and cleanup of the drainage pipe network in the production unit, which not only reduced the loss of liquid ammonia in the process, but also collected and recycled the ammonia-containing wastewater separately during the discharge process. Avoiding the increase of sewage volume and the difficulty of treatment. The main technical transformation measures are as follows:
1. An underground storage tank is newly added in the urea plant area to recover all ammonia-containing wastewater discharged during the production of synthetic ammonia and urea. The storage tank is equipped with a motor pump. When the storage tank reaches a certain level, the motor pump is used. The waste liquid is sent back to the urea high-pressure ring system for recycling, evaporation and other procedures. The ammonia, urea and other substances in the waste liquid are separated as products for recycling. Sent to the circulating water station for recycling as cooling water.
2. For the collection of ammonia-containing wastewater in the production process, the company has established a comprehensive recycling pipeline network and recycling route. Under the condition that it does not affect the overall structure, the wastewater is introduced into underground storage by means of merging the pipeline network and transforming wastewater discharge facilities and equipment. Tank to achieve the goal of recycling waste liquid.
3. The technical transformation of the wastewater discharge section and the pollution-producing equipment. In 2011, the company was determined to contribute to energy conservation and consumption reduction. Therefore, it strengthened the technical transformation and improvement of various production equipment. By comparing other Dahua devices, During the inspection, a large number of the company's heat exchange equipment, pump equipment, and high energy-consuming equipment were retrofitted with energy-saving technologies, thereby reducing the production energy consumption from the original 36.9GJ / tonne ammonia to 33.2GJ / tonne ammonia.
The company has always attached importance to the source control of environmental pollution, using advanced technology and effective material recovery measures, turning waste into treasure, and integrating pollution control throughout the production process. During the construction period, the company invested a total of 29.342 million yuan in environmental protection funds to meet the construction of projects such as pollution control, prevention of environmental risks, soil and water conservation, and beautification of the environment during production.
In the production process, effective measures are taken to prevent and control the exhaust gas pollution. For example, the synthetic ammonia process is used for purge and exhaust, and the exhaust gas is shut down to recover hydrogen and ammonia. The tail gas is sent to a reformer as fuel, which is not directly discharged. This reduces the pollution of the atmospheric environment and makes full use of energy and "three waste “Resources; boiler flue gas uses clean energy natural gas as raw materials, and a 50m high exhaust pipe is constructed to discharge, which effectively reduces the pollution of exhaust gas; urea concentrated evaporated exhaust gas is boosted by a secondary steam ejector and sent to the corresponding surface cooler Intermediate cooling, non-condensing inert gas is discharged through the exhaust cylinder above 60m after washing.
The company has not had an environmental accident or environmental complaint in the past three years of construction and operation. It has been visited and praised by provincial and municipal leaders many times. In the future, the company will continue to tap the potential in the process of environmental protection, introduce excellent advanced environmental protection facilities and environmental protection technology, and strive to make the environmental protection work more perfect.