Emergency plan text 5

3.3.2 Environmental Risks and Emergency Preventive Measures for Target 2

The main sources of danger for Target 2 are the tertiary absorption of ammonia and the storage of ammonia. Ammonia is flammable, toxic, and irritating. The specific nature and emergency treatment are shown in Annex VI.

3.4 Analysis of the largest credible accident and its source term

3.4.1 Type of accident

(1) Types of potential accidents in production facilities

According to the causes of domestic and foreign petrochemical production and the release of toxic and harmful, flammable and explosive substances, based on the analysis of the key parts and weak links of major hazardous devices, the analysis of fire and explosion indexes, and the results of analogical investigation and analysis, the potential hazard of the project production device is fire Explosions and leakage of toxic substances. However, since the production process of this project is intermittent operation and is not a continuous production device, corresponding measures can be taken on the accident device unit in time when an accident occurs, which is more convenient to control the accident in the accident unit and collect leaked materials.

(2) Types of potential accidents in storage systems

Because the project storage system stores a variety of flammable and explosive materials, including methanol, cyclohexane, chloroform, triethyl ester, etc. Although each substance has not reached the critical amount, most of the storage materials are organic solvents with high heating value. Therefore, fire and explosion is one of its main potential accidents.

3.4.2 Determination of the maximum credible accident

According to the definition of HJ / T-2004 of Technical Guidelines for Environmental Risk Assessment of Construction Projects, the maximum credible accident is the major accident that is most likely to cause harm to the environment (or health) among all predicted accidents with non-zero probability. accident. Major accidents are fires, explosions, and toxic and hazardous substance leakage incidents that lead to the release of toxic and hazardous substances, which cause serious harm to the public and cause serious pollution to the environment.

This construction project has multiple accident risk sources. Major environmental pollution accidents may occur during the entire production and storage process of the construction project. However, it can be seen from statistics that the storage and transportation system accidents in the petrochemical industry account for 20-30% of the total accidents. The accident probability is high, and the inventory of hazardous materials in the storage system is much larger than the production system. The environmental risk at the time of the accident is greater than the production system. Therefore, the accident in the storage and transportation system is selected as the largest credible accident.

3.4.3 Probability of maximum credible accident

The accident probability can be obtained by analyzing the accident tree and determining the top event by using the probability calculation method. The probability statistics can also be given through the accident investigation of similar devices.

(1) Using the accident tree (FTA) analysis method, the probability of fire and explosion in the storage tank is 1 × 10-5.

(2) According to the accident statistics and management level of the project, analogous to the current similar accident data, the probability of material leakage is 5.8 × 10^-5.

Table 3-4 Maximum credible accident source items

3.5 Consequence calculation

3.5.1 Water consumption for fire fighting

According to the relevant regulations in the "Code for Fire Protection in Building Design", the company's total fire water consumption is 378m3. The company has a fire-fighting pool with an effective volume of 400m3, which can fully meet the fire water requirements.

3.5.2 Fire equipment

According to the relevant requirements in the "Code for Fire Protection Design of Petrochemical Enterprises" (GB50160-92), the company is equipped with sufficient fire fighting equipment.

4 organization and responsibilities

4.1 Organization System

The composition of the emergency organization is composed of an emergency leadership group, an emergency command center, an office and a working organization, a major emergency work department, an emergency work support department, an information group, an expert group, and an on-site emergency command. The emergency rescue organization is shown in Figure 2-1.

4.2 Duties

See Table 2-1 for the emergency work responsibilities, coordination management scope, main problems to be solved and specific operation steps of each department in the emergency organization system.

Table 2-1 Accident Emergency Rescue Command Leading Group and Division of Duties

Figure 2-1 Emergency rescue organization chart